omni_dev/atlassian/

convert.rs

//! Bidirectional conversion between markdown and Atlassian Document Format.
//!
//! Supports Tier 1 (standard GFM) constructs: headings, paragraphs, inline
//! marks (bold, italic, code, strikethrough, links), images, lists, code
//! blocks, blockquotes, horizontal rules, and tables.

use anyhow::{bail, Result};
use chrono::NaiveDate;
use tracing::{debug, warn};

use crate::atlassian::adf::{AdfDocument, AdfMark, AdfNode};
use crate::atlassian::attrs::{format_kv, parse_attrs, Attrs};
use crate::atlassian::directive::{
    is_container_close, try_parse_container_open, try_parse_inline_directive,
    try_parse_leaf_directive,
};

// ── Markdown → ADF ──────────────────────────────────────────────────

/// Maximum nesting depth for markdown → ADF conversion.
///
/// The parser recurses once per nesting level (blockquotes, lists, container
/// directives, directive-table cells, inline marks), so unbounded input would
/// overflow the stack — an uncatchable abort that would kill the long-lived
/// MCP server (issue #1130).  The ADF → markdown direction is already bounded
/// at 128 by serde_json's recursion limit; this cap is lower because the
/// nested-list frame chain is heavy enough in debug builds that at-cap
/// parsing must still fit within a 2 MiB thread stack.  Realistic documents
/// nest well under 20 levels.
const MAX_NESTING_DEPTH: usize = 64;

/// The JFM block-attr key that keeps two adjacent lists from being read as
/// one CommonMark loose list (`{list=separate}`); see
/// [`needs_list_separator`] (issue #1729).
///
/// It carries no ADF meaning.  The parser recognises it only so the line is
/// consumed rather than becoming a paragraph — the *mechanism* is that any
/// trailing attrs line ends the list loop.
const LIST_SEPARATE_ATTR: &str = "list";

/// Converts a markdown string to an ADF document.
pub fn markdown_to_adf(markdown: &str) -> Result<AdfDocument> {
    debug!(
        "markdown_to_adf: input {} bytes, {} lines",
        markdown.len(),
        markdown.lines().count()
    );
    let mut doc = AdfDocument::new();
    let mut parser = MarkdownParser::new(markdown);
    doc.content = parser.parse_blocks()?;
    let split = split_emphasis_code_marks(&mut doc.content);
    if split > 0 {
        debug!(
            "markdown_to_adf: dropped {split} emphasis mark(s) from inline-code runs \
             (ADF forbids combining them with `code`; issue #1391)"
        );
    }
    debug!(
        "markdown_to_adf: produced {} top-level ADF nodes",
        doc.content.len()
    );
    Ok(doc)
}

/// Returns the 1-based start number of an `orderedList`, defaulting to 1 when
/// `attrs.order` is absent.
fn ordered_list_start(node: &AdfNode) -> u32 {
    node.attrs
        .as_ref()
        .and_then(|a| a.get("order"))
        .and_then(serde_json::Value::as_u64)
        .and_then(|v| u32::try_from(v).ok())
        .unwrap_or(1)
}

/// Returns the number of items a list node renders.
fn list_item_count(node: &AdfNode) -> usize {
    node.content.as_ref().map_or(0, Vec::len)
}

/// Returns `true` for the three ADF list node types.
fn is_list_node_type(node_type: &str) -> bool {
    matches!(node_type, "bulletList" | "orderedList" | "taskList")
}

/// Returns `true` when `line` is a list marker belonging to an enclosing
/// list rather than to the item whose content starts at `content_indent`
/// (issue #1727).
fn is_sibling_marker(line: &str, content_indent: usize) -> bool {
    is_list_start(line) && leading_spaces(line) < content_indent
}

/// Line-oriented state machine for parsing markdown into ADF block nodes.
struct MarkdownParser<'a> {
    lines: Vec<&'a str>,
    pos: usize,
    /// Nesting depth of this parser: 0 at the document root, +1 for each
    /// nested parser spawned for container content (blockquote, list item,
    /// panel, layout column, table cell, …).  Checked against
    /// [`MAX_NESTING_DEPTH`] in [`Self::parse_blocks`].
    depth: usize,
}

impl<'a> MarkdownParser<'a> {
    fn new(input: &'a str) -> Self {
        Self::with_depth(input, 0)
    }

    /// Creates a nested parser for container content at the given depth.
    fn with_depth(input: &'a str, depth: usize) -> Self {
        Self {
            lines: input.lines().collect(),
            pos: 0,
            depth,
        }
    }

    fn at_end(&self) -> bool {
        self.pos >= self.lines.len()
    }

    fn current_line(&self) -> &'a str {
        debug_assert!(!self.at_end(), "current_line called at end of input");
        self.lines[self.pos]
    }

    fn advance(&mut self) {
        self.pos += 1;
    }

    /// Collects indented continuation lines produced by hardBreaks (issue #402).
    ///
    /// When `full_text` ends with a hardBreak marker (trailing backslash or
    /// two trailing spaces), the next 2-space-indented line is appended as a
    /// continuation of the same paragraph.  The joined text is later fed to
    /// `parse_inline`, which converts the `\\\n` or `  \n` sequences back
    /// into `hardBreak` nodes.
    fn collect_hardbreak_continuations(&mut self, full_text: &mut String) {
        // Outside a list item nothing is a sibling marker: no line is
        // indented less than zero.
        self.collect_hardbreak_continuations_with_content_indent(full_text, 0);
    }

    /// [`Self::collect_hardbreak_continuations`] for a list item whose
    /// marker starts at `marker_indent` spaces.
    ///
    /// A list marker indented less than the item's content column is the
    /// next sibling item, not continuation text, and ends the paragraph
    /// (issue #1727).  One *at* the content column is still continuation
    /// text (issue #402: `1. First\` + `  2. Second` is one paragraph).
    fn collect_item_hardbreak_continuations(
        &mut self,
        full_text: &mut String,
        marker_indent: usize,
    ) {
        self.collect_hardbreak_continuations_with_content_indent(full_text, marker_indent + 2);
    }

    fn collect_hardbreak_continuations_with_content_indent(
        &mut self,
        full_text: &mut String,
        content_indent: usize,
    ) {
        while has_trailing_hard_break(full_text) && !self.at_end() {
            if !self.try_append_hardbreak_continuation(full_text, content_indent) {
                break;
            }
        }
    }

    /// If the current line is a valid hardBreak continuation (2-space indented
    /// and not a block-level sibling marker), append it to `full_text` and
    /// advance the parser.  Returns `true` on success, `false` otherwise.
    ///
    /// Split out from `collect_hardbreak_continuations` so the body appears
    /// as its own function in coverage reports (issue #552 PR coverage gap).
    fn try_append_hardbreak_continuation(
        &mut self,
        full_text: &mut String,
        content_indent: usize,
    ) -> bool {
        // Skip indented block-level siblings — mediaSingle (`![` — issue
        // #490), fenced code blocks (```` ``` ```` — issue #552), and
        // container directives (`:::`).  They must stay available for their
        // dedicated block handlers instead of being merged into paragraph
        // text.  A list marker indented below the item's content column is
        // a sibling item (issue #1727).
        let line = self.current_line();
        if is_sibling_marker(line, content_indent) {
            return false;
        }
        match line
            .strip_prefix("  ")
            .filter(|s| !is_block_level_continuation_marker(s.trim_start()))
        {
            Some(stripped) => {
                full_text.push('\n');
                full_text.push_str(stripped);
                self.advance();
                true
            }
            None => false,
        }
    }

    /// Collects the 2-space-indented sub-content lines of the current list
    /// item, stripping the two spaces.
    ///
    /// A list marker indented less than two spaces deeper than the item's
    /// own marker is a sibling item, not sub-content, and is left for the
    /// enclosing item loop (issue #1727).  Non-marker lines keep the
    /// pre-existing "any 2-space-indented line" rule so that continuation
    /// paragraphs and fenced blocks written at the marker's own column still
    /// belong to the item.
    ///
    /// A bare blank line (no 2-space prefix at all) does not by itself end
    /// the item: CommonMark only ends a list item at a blank line when the
    /// line that follows it is *not* indented to the item's content column.
    /// So a run of one or more bare blank lines is looked ahead past — the
    /// run is only consumed (as empty sub-lines, which the nested parser
    /// treats as paragraph separators) when the first non-blank line after
    /// it still belongs to this item; otherwise the blanks are left
    /// untouched for the enclosing block loop, ending the item exactly as
    /// before (issue #1732). A whitespace-only line that already carries the
    /// 2-space prefix is unaffected and keeps falling through to the
    /// existing paragraph-separator path below.
    ///
    /// Content indented *deeper* than the mandatory 2-space column (e.g. 3
    /// spaces under a `1. ` marker, or hand-formatted 4-space nesting) keeps
    /// its surplus after the strip above. Remove it by dedenting the item's
    /// own *leading run* — the maximal prefix of `sub_lines` before the
    /// first entry that is itself a nested list marker — by that run's own
    /// minimum indent over non-blank-content entries (issue #1735).
    ///
    /// This is deliberately scoped to the leading run rather than the whole
    /// returned block: a marker line's *residual* indentation is load-bearing
    /// for the recursive parse one level down, which re-derives its own
    /// `marker_indent` from `leading_spaces` on that very line. Dedenting a
    /// marker line here would corrupt that derivation. Concretely, a fence
    /// written at a nested item's own marker column (issue #1727's
    /// "leniency": `- Child` and its fence at the *same* indent) relies on
    /// each recursion level stripping only the mandatory 2 spaces from the
    /// marker line for the residual to reach exactly 0 by the time the fence
    /// needs recognizing at column 0 — a whole-block minimum computed across
    /// the marker line too would strip too much from it and drop the fence's
    /// content out of the item's scope entirely. Everything from the first
    /// marker line onward is therefore left untouched; the recursive parse of
    /// that nested content applies this same rule to *its own* leading run
    /// when it recurses, so multi-level surplus is removed by induction one
    /// level at a time.
    fn collect_item_sub_lines(&mut self, marker_indent: usize) -> Vec<String> {
        let mut sub_lines: Vec<String> = Vec::new();
        while !self.at_end() {
            let next = self.current_line();
            if next.trim().is_empty() && next.strip_prefix("  ").is_none() {
                let mut lookahead = self.pos;
                while lookahead < self.lines.len() && self.lines[lookahead].trim().is_empty() {
                    lookahead += 1;
                }
                let continues = lookahead < self.lines.len() && {
                    let after = self.lines[lookahead];
                    after.strip_prefix("  ").is_some()
                        && !is_sibling_marker(after, marker_indent + 2)
                };
                if !continues {
                    break;
                }
                while self.pos < lookahead {
                    sub_lines.push(String::new());
                    self.advance();
                }
                continue;
            }
            let Some(stripped) = next.strip_prefix("  ") else {
                break;
            };
            if is_sibling_marker(next, marker_indent + 2) {
                break;
            }
            sub_lines.push(stripped.to_string());
            self.advance();
        }

        // Dedent the surplus indentation ahead of the first nested marker
        // (issue #1735); see the doc comment above for why the dedent stops
        // there instead of covering the whole block.
        let boundary = sub_lines
            .iter()
            .position(|l| is_list_start(l))
            .unwrap_or(sub_lines.len());
        let extra = sub_lines[..boundary]
            .iter()
            .filter(|l| !l.trim().is_empty())
            .map(|l| leading_spaces(l))
            .min()
            .unwrap_or(0);
        if extra > 0 {
            for line in &mut sub_lines[..boundary] {
                if !line.trim().is_empty() {
                    line.replace_range(..extra, "");
                }
            }
        }

        sub_lines
    }

    fn parse_blocks(&mut self) -> Result<Vec<AdfNode>> {
        if self.depth > MAX_NESTING_DEPTH {
            bail!(
                "Markdown nesting exceeds the maximum depth of {MAX_NESTING_DEPTH} \
                 (nested blockquotes, lists, panels, expands, layouts, or table \
                 cells); flatten the document structure"
            );
        }

        let mut blocks = Vec::new();

        while !self.at_end() {
            let line = self.current_line();

            if line.trim().is_empty() {
                self.advance();
                continue;
            }

            let mut node = if let Some(node) = self.try_heading() {
                node
            } else if let Some(node) = self.try_horizontal_rule() {
                node
            } else if let Some(node) = self.try_container_directive()? {
                node
            } else if let Some(node) = self.try_code_block()? {
                node
            } else if let Some(node) = self.try_table()? {
                node
            } else if let Some(node) = self.try_blockquote()? {
                node
            } else if let Some(node) = self.try_list()? {
                node
            } else if let Some(node) = self.try_leaf_directive() {
                node
            } else if let Some(node) = self.try_image() {
                node
            } else {
                self.parse_paragraph()?
            };

            // Check for trailing block-level {attrs} (align, indent, breakout)
            self.try_apply_block_attrs(&mut node);
            blocks.push(node);
        }

        Ok(blocks)
    }

    fn try_heading(&mut self) -> Option<AdfNode> {
        let line = self.current_line();
        let trimmed = line.trim_start();

        if !trimmed.starts_with('#') {
            return None;
        }

        let level = trimmed.chars().take_while(|&c| c == '#').count();
        if !(1..=6).contains(&level) || !trimmed[level..].starts_with(' ') {
            return None;
        }

        let mut full_text = trimmed[level + 1..].to_string();
        self.advance();
        // Collect indented continuation lines produced by hardBreaks (issue #433).
        self.collect_hardbreak_continuations(&mut full_text);
        let mut inline_nodes = parse_inline(&full_text);
        // ADF's `heading` content model forbids the `code` mark, but
        // JFM/CommonMark parses inline-code spans inside `#`-headings. Strip
        // them here (keeping the text as plain) so we don't build a document
        // the validator only rejects at write time (issue #1005).
        if strip_heading_code_marks(&mut inline_nodes) > 0 {
            warn!(
                "Stripped inline `code` from heading (ADF forbids code marks on \
                 headings; kept the text as plain): {}",
                full_text.trim()
            );
        }

        #[allow(clippy::cast_possible_truncation)]
        Some(AdfNode::heading(level as u8, inline_nodes))
    }

    fn try_horizontal_rule(&mut self) -> Option<AdfNode> {
        let line = self.current_line().trim();
        let is_rule = (line.starts_with("---") && line.chars().all(|c| c == '-'))
            || (line.starts_with("***") && line.chars().all(|c| c == '*'))
            || (line.starts_with("___") && line.chars().all(|c| c == '_'));

        if is_rule && line.len() >= 3 {
            self.advance();
            Some(AdfNode::rule())
        } else {
            None
        }
    }

    fn try_code_block(&mut self) -> Result<Option<AdfNode>> {
        let line = self.current_line();
        if !is_code_fence_opener(line) {
            return Ok(None);
        }

        let language = line[3..].trim();
        let language = if language == "\"\"" {
            // Explicit empty language attr encoded as ```""
            Some(String::new())
        } else if language.is_empty() {
            None
        } else {
            Some(language.to_string())
        };

        self.advance();
        let mut code_lines = Vec::new();

        while !self.at_end() {
            let line = self.current_line();
            if line.starts_with("```") {
                self.advance();
                break;
            }
            code_lines.push(line);
            self.advance();
        }

        let code_text = code_lines.join("\n");

        // If the language is "adf-unsupported", deserialize the JSON back to an AdfNode
        if language.as_deref() == Some("adf-unsupported") {
            if let Ok(node) = serde_json::from_str::<AdfNode>(&code_text) {
                return Ok(Some(node));
            }
        }

        Ok(Some(AdfNode::code_block(language.as_deref(), &code_text)))
    }

    fn try_blockquote(&mut self) -> Result<Option<AdfNode>> {
        let line = self.current_line();
        if !line.starts_with('>') {
            return Ok(None);
        }

        let mut quote_lines = Vec::new();
        while !self.at_end() {
            let line = self.current_line();
            if let Some(rest) = line.strip_prefix("> ") {
                quote_lines.push(rest);
                self.advance();
            } else if let Some(rest) = line.strip_prefix('>') {
                quote_lines.push(rest);
                self.advance();
            } else {
                break;
            }
        }

        let quote_text = quote_lines.join("\n");
        let mut inner_parser = MarkdownParser::with_depth(&quote_text, self.depth + 1);
        let inner_blocks = inner_parser.parse_blocks()?;

        Ok(Some(AdfNode::blockquote(inner_blocks)))
    }

    fn try_list(&mut self) -> Result<Option<AdfNode>> {
        let line = self.current_line();
        let trimmed = line.trim_start();

        let is_bullet =
            trimmed.starts_with("- ") || trimmed.starts_with("* ") || trimmed.starts_with("+ ");
        let ordered_match = parse_ordered_list_marker(trimmed);

        if !is_bullet && ordered_match.is_none() {
            return Ok(None);
        }

        if is_bullet {
            self.parse_bullet_list()
        } else {
            let start = ordered_match.map_or(1, |(n, _)| n);
            self.parse_ordered_list(start)
        }
    }

    /// Returns the index of the first non-blank line at or after the cursor,
    /// or `None` when only blank lines remain.  Does not advance.
    fn peek_past_blank_run(&self) -> Option<usize> {
        let mut i = self.pos;
        while i < self.lines.len() && self.lines[i].trim().is_empty() {
            i += 1;
        }
        (i < self.lines.len()).then_some(i)
    }

    /// Consumes the run of blank lines at the cursor.
    fn skip_blank_run(&mut self) {
        while !self.at_end() && self.current_line().trim().is_empty() {
            self.advance();
        }
    }

    /// Returns `true` when the first non-blank line after the blank run at
    /// the cursor is another item of the bullet/task list being parsed — a
    /// marker at the list's own indent whose task-ness matches (issue #1729).
    fn loose_bullet_item_follows(&self, first_marker_indent: usize, is_task_list: bool) -> bool {
        let Some(idx) = self.peek_past_blank_run() else {
            return false;
        };
        let after = self.lines[idx];
        if leading_spaces(after) != first_marker_indent {
            return false;
        }
        let trimmed = after.trim_start();
        if !(trimmed.starts_with("- ") || trimmed.starts_with("* ") || trimmed.starts_with("+ ")) {
            return false;
        }
        // A checkbox marker opens a `taskList` and a bare bullet a
        // `bulletList`; the two are never items of the same list.
        try_parse_task_marker(trimmed[2..].trim_start()).is_some() == is_task_list
    }

    /// The [`Self::loose_bullet_item_follows`] counterpart for ordered lists:
    /// the next marker must also continue this list's numbering (or restart
    /// at `1.`); see [`Self::parse_ordered_list`].
    fn loose_ordered_item_follows(
        &self,
        first_marker_indent: usize,
        start: u32,
        seen: usize,
    ) -> bool {
        let Some(idx) = self.peek_past_blank_run() else {
            return false;
        };
        let after = self.lines[idx];
        if leading_spaces(after) != first_marker_indent {
            return false;
        }
        let Some((n, _)) = parse_ordered_list_marker(after.trim_start()) else {
            return false;
        };
        let seen = u32::try_from(seen).unwrap_or(u32::MAX);
        n == start.saturating_add(seen) || n == 1
    }

    fn parse_bullet_list(&mut self) -> Result<Option<AdfNode>> {
        let mut items = Vec::new();
        // The column of this list's first marker.  A loose-list continuation
        // must sit at exactly this indent to be an item of *this* list.
        let first_marker_indent = leading_spaces(self.current_line());
        // The list's kind is decided by its first item; a later marker whose
        // task-ness differs ends this list rather than joining it (issue #1736).
        let is_task_list = {
            let trimmed = self.current_line().trim_start();
            try_parse_task_marker(trimmed[2..].trim_start()).is_some()
        };

        while !self.at_end() {
            let line = self.current_line();

            // CommonMark *loose* list: a blank line between two items does
            // not end the list.  Look ahead past the run of blanks; when the
            // next non-blank line is an item this very loop would parse,
            // consume the blanks and carry on.  Otherwise leave them
            // untouched for the enclosing block loop, ending the list exactly
            // as before (issue #1729).
            if line.trim().is_empty() {
                if !self.loose_bullet_item_follows(first_marker_indent, is_task_list) {
                    break;
                }
                self.skip_blank_run();
                continue;
            }

            let trimmed = line.trim_start();

            if !(trimmed.starts_with("- ")
                || trimmed.starts_with("* ")
                || trimmed.starts_with("+ "))
            {
                break;
            }

            let after_marker = trimmed[2..].trim_start();

            // A checkbox marker opens a `taskList` and a bare bullet a
            // `bulletList`; the two are never items of the same list — a
            // mismatch here ends this list, leaving the line for the
            // enclosing block loop to start a second, adjacent one
            // (issue #1736).
            if try_parse_task_marker(after_marker).is_some() != is_task_list {
                break;
            }

            // Detect task list items: - [ ] or - [x]
            if let Some((state, text)) = try_parse_task_marker(after_marker) {
                self.advance();
                // Collect hardBreak continuation lines so that a trailing
                // {localId=…} on the last continuation line is found by
                // extract_trailing_local_id (issue #507).
                let mut full_text = text.to_string();
                self.collect_item_hardbreak_continuations(&mut full_text, leading_spaces(line));
                let (item_text, local_id, para_local_id) = extract_trailing_local_id(&full_text);
                let inline_nodes = parse_inline(item_text);
                // If a paraLocalId marker is present the original ADF had a
                // paragraph wrapper around the inline content — restore it
                // so the round-trip is lossless (issue #478).
                let content = if let Some(ref plid) = para_local_id {
                    let mut para = AdfNode::paragraph(inline_nodes);
                    if plid != "_" {
                        para.attrs = Some(serde_json::json!({"localId": plid}));
                    }
                    vec![para]
                } else {
                    inline_nodes
                };
                let mut task = AdfNode::task_item(state, content);
                // Override the placeholder localId if one was parsed
                if let Some(id) = local_id {
                    if let Some(ref mut attrs) = task.attrs {
                        attrs["localId"] = serde_json::Value::String(id);
                    }
                }
                // Collect indented sub-content (e.g. nested task lists
                // from malformed ADF where taskItem contains taskItem
                // children directly — issue #489).
                let sub_lines = self.collect_item_sub_lines(leading_spaces(line));
                if !sub_lines.is_empty() {
                    let sub_text = sub_lines.join("\n");
                    let mut nested =
                        MarkdownParser::with_depth(&sub_text, self.depth + 1).parse_blocks()?;
                    // When the task item has no inline text and its
                    // sub-content is a single taskList, this is a
                    // container taskItem from malformed ADF (issue #489).
                    // Unwrap the taskList so the taskItem children sit
                    // directly in the container, and drop the spurious
                    // `state` attr that was injected by the checkbox
                    // marker.
                    let is_empty = task.content.as_ref().is_none_or(Vec::is_empty);
                    if is_empty && nested.len() == 1 && nested[0].node_type == "taskList" {
                        if let Some(task_items) = nested.remove(0).content {
                            task.content = Some(task_items);
                        }
                        if let Some(ref mut attrs) = task.attrs {
                            if let Some(obj) = attrs.as_object_mut() {
                                obj.remove("state");
                            }
                        }
                        items.push(task);
                    } else {
                        // Separate nested taskList nodes from other block
                        // content.  Nested taskLists become sibling children
                        // of the outer taskList rather than children of this
                        // taskItem, matching ADF's representation of indented
                        // sub-lists (issue #506).
                        let mut sibling_task_lists = Vec::new();
                        let mut child_nodes = Vec::new();
                        for n in nested {
                            if n.node_type == "taskList" {
                                sibling_task_lists.push(n);
                            } else {
                                child_nodes.push(n);
                            }
                        }
                        if !child_nodes.is_empty() {
                            match task.content {
                                Some(ref mut content) => content.append(&mut child_nodes),
                                None => task.content = Some(child_nodes),
                            }
                        }
                        items.push(task);
                        items.append(&mut sibling_task_lists);
                    }
                } else {
                    items.push(task);
                }
            } else {
                let first_line = &trimmed[2..];
                self.advance();
                let mut full_text = first_line.to_string();
                self.collect_item_hardbreak_continuations(&mut full_text, leading_spaces(line));
                let (item_text, local_id, para_local_id) = extract_trailing_local_id(&full_text);
                // Collect indented sub-content lines (2-space prefix).
                // This captures both nested lists and continuation
                // paragraphs that belong to the same list item.
                let sub_lines = self.collect_item_sub_lines(leading_spaces(line));
                let item_content = parse_list_item_first_line(
                    item_text,
                    sub_lines,
                    local_id,
                    para_local_id,
                    self.depth + 1,
                )?;
                items.push(item_content);
            }
        }

        if items.is_empty() {
            Ok(None)
        } else if is_task_list {
            Ok(Some(AdfNode::task_list(items)))
        } else {
            Ok(Some(AdfNode::bullet_list(items)))
        }
    }

    /// Parses an ordered list starting at `start`.
    ///
    /// A blank line between two items does not end the list when the next
    /// marker continues the numbering — or restarts at `1.`, which CommonMark
    /// treats as a "don't-care" number (`1. 1. 1.` is the idiomatic way to
    /// write an ordered list whose items are numbered by position).  A
    /// restart at any *other* number — `1. a`, `2. b`, blank, `5. c` — is
    /// read as authored and stays a second list, so the `5` survives the
    /// round trip.  That is a deliberate JFM deviation: CommonMark would fuse
    /// the two and renumber the item to `3`, discarding the authored number
    /// (issue #1729).
    fn parse_ordered_list(&mut self, start: u32) -> Result<Option<AdfNode>> {
        let mut items = Vec::new();
        let first_marker_indent = leading_spaces(self.current_line());

        while !self.at_end() {
            let line = self.current_line();

            if line.trim().is_empty() {
                if !self.loose_ordered_item_follows(first_marker_indent, start, items.len()) {
                    break;
                }
                self.skip_blank_run();
                continue;
            }

            let trimmed = line.trim_start();

            if let Some((_, rest)) = parse_ordered_list_marker(trimmed) {
                let first_line = rest.trim_start_matches(|c: char| c.is_ascii_whitespace());
                self.advance();
                let mut full_text = first_line.to_string();
                self.collect_item_hardbreak_continuations(&mut full_text, leading_spaces(line));
                let (item_text, local_id, para_local_id) = extract_trailing_local_id(&full_text);
                // Collect indented sub-content lines (2-space prefix).
                let sub_lines = self.collect_item_sub_lines(leading_spaces(line));
                let item_content = parse_list_item_first_line(
                    item_text,
                    sub_lines,
                    local_id,
                    para_local_id,
                    self.depth + 1,
                )?;
                items.push(item_content);
            } else {
                break;
            }
        }

        if items.is_empty() {
            Ok(None)
        } else {
            let order = if start == 1 { None } else { Some(start) };
            Ok(Some(AdfNode::ordered_list(items, order)))
        }
    }

    fn try_apply_block_attrs(&mut self, node: &mut AdfNode) {
        if self.at_end() {
            return;
        }
        let line = self.current_line().trim();
        if !line.starts_with('{') {
            return;
        }
        let Some((_, attrs)) = parse_attrs(line, 0) else {
            return;
        };

        let mut marks = Vec::new();
        if let Some(align) = attrs.get("align") {
            marks.push(AdfMark::alignment(align));
        }
        if let Some(indent) = attrs.get("indent") {
            if let Ok(level) = indent.parse::<u32>() {
                marks.push(AdfMark::indentation(level));
            }
        }
        if let Some(mode) = attrs.get("breakout") {
            let width = attrs
                .get("breakoutWidth")
                .and_then(|w| w.parse::<u32>().ok());
            marks.push(AdfMark::breakout(mode, width));
        }

        // Parse localId from block attrs
        let local_id = attrs.get("localId").map(str::to_string);

        // Parse explicit order for orderedList nodes (issue #547).
        let order = if node.node_type == "orderedList" {
            attrs.get("order").and_then(|v| v.parse::<u32>().ok())
        } else {
            None
        };

        // `{list=separate}` carries no ADF meaning: reaching this function at
        // all already means the attrs line ended the list, which is the whole
        // mechanism.  It is recognised only so the line is consumed instead of
        // becoming a literal paragraph (issue #1729).
        let list_separate =
            attrs.get(LIST_SEPARATE_ATTR) == Some("separate") && is_list_node_type(&node.node_type);

        let has_attrs = !marks.is_empty() || local_id.is_some() || order.is_some() || list_separate;
        if has_attrs {
            if !marks.is_empty() {
                let existing = node.marks.get_or_insert_with(Vec::new);
                existing.extend(marks);
            }
            if let Some(id) = local_id {
                let node_attrs = node.attrs.get_or_insert_with(|| serde_json::json!({}));
                node_attrs["localId"] = serde_json::Value::String(id);
            }
            if let Some(n) = order {
                let node_attrs = node.attrs.get_or_insert_with(|| serde_json::json!({}));
                node_attrs["order"] = serde_json::json!(n);
            }
            self.advance(); // consume the attrs line
        }
    }

    fn try_container_directive(&mut self) -> Result<Option<AdfNode>> {
        let line = self.current_line();
        let Some((d, colon_count)) = try_parse_container_open(line) else {
            return Ok(None);
        };
        let start_line = self.pos + 1; // 1-based line number of the opening fence
        self.advance(); // past opening fence

        // Collect inner lines until the matching close fence, tracking nesting
        let mut inner_lines = Vec::new();
        let mut depth: usize = 0;
        let mut closed = false;
        while !self.at_end() {
            let current = self.current_line();
            if try_parse_container_open(current).is_some() {
                depth += 1;
            } else if depth == 0 && is_container_close(current, colon_count) {
                self.advance(); // past closing fence
                closed = true;
                break;
            } else if depth > 0 && is_container_close(current, 3) {
                depth -= 1;
            }
            inner_lines.push(current.to_string());
            self.advance();
        }

        let inner_text = inner_lines.join("\n");

        let node = match d.name.as_str() {
            "panel" => {
                let panel_type = d
                    .attrs
                    .as_ref()
                    .and_then(|a| a.get("type"))
                    .unwrap_or("info");
                let inner_blocks =
                    MarkdownParser::with_depth(&inner_text, self.depth + 1).parse_blocks()?;
                let mut node = AdfNode::panel(panel_type, inner_blocks);
                // Pass through custom panel attrs (icon, color)
                if let Some(ref attrs) = d.attrs {
                    if let Some(ref mut node_attrs) = node.attrs {
                        if let Some(icon) = attrs.get("icon") {
                            node_attrs["panelIcon"] = serde_json::Value::String(icon.to_string());
                        }
                        if let Some(color) = attrs.get("color") {
                            node_attrs["panelColor"] = serde_json::Value::String(color.to_string());
                        }
                    }
                }
                node
            }
            "expand" => {
                let title = d.attrs.as_ref().and_then(|a| a.get("title"));
                let inner_blocks =
                    MarkdownParser::with_depth(&inner_text, self.depth + 1).parse_blocks()?;
                let mut node = AdfNode::expand(title, inner_blocks);
                pass_through_expand_params(&d.attrs, &mut node);
                node
            }
            "nested-expand" => {
                let title = d.attrs.as_ref().and_then(|a| a.get("title"));
                let inner_blocks =
                    MarkdownParser::with_depth(&inner_text, self.depth + 1).parse_blocks()?;
                let mut node = AdfNode::nested_expand(title, inner_blocks);
                pass_through_expand_params(&d.attrs, &mut node);
                node
            }
            "layout" => {
                // Parse inner content looking for :::column sub-containers
                let columns = self.parse_layout_columns(&inner_text)?;
                AdfNode::layout_section(columns)
            }
            "decisions" => {
                let items = parse_decision_items(&inner_text);
                AdfNode::decision_list(items)
            }
            "table" => {
                let rows = self.parse_directive_table_rows(&inner_text)?;
                let mut table_attrs = serde_json::json!({});
                if let Some(ref attrs) = d.attrs {
                    if let Some(layout) = attrs.get("layout") {
                        table_attrs["layout"] = serde_json::Value::String(layout.to_string());
                    }
                    if attrs.has_flag("numbered") {
                        table_attrs["isNumberColumnEnabled"] = serde_json::json!(true);
                    } else if attrs.get("numbered") == Some("false") {
                        table_attrs["isNumberColumnEnabled"] = serde_json::json!(false);
                    }
                    if let Some(tw) = attrs.get("width") {
                        if let Some(w) = parse_numeric_attr(tw) {
                            table_attrs["width"] = w;
                        }
                    }
                    if let Some(local_id) = attrs.get("localId") {
                        table_attrs["localId"] = serde_json::Value::String(local_id.to_string());
                    }
                }
                if table_attrs == serde_json::json!({}) {
                    AdfNode::table(rows)
                } else {
                    AdfNode::table_with_attrs(rows, table_attrs)
                }
            }
            "extension" => {
                let ext_type = d.attrs.as_ref().and_then(|a| a.get("type")).unwrap_or("");
                let ext_key = d.attrs.as_ref().and_then(|a| a.get("key")).unwrap_or("");
                let inner_blocks =
                    MarkdownParser::with_depth(&inner_text, self.depth + 1).parse_blocks()?;
                let mut node = AdfNode::bodied_extension(ext_type, ext_key, inner_blocks);
                if let (Some(ref dir_attrs), Some(ref mut node_attrs)) = (&d.attrs, &mut node.attrs)
                {
                    if let Some(layout) = dir_attrs.get("layout") {
                        node_attrs["layout"] = serde_json::Value::String(layout.to_string());
                    }
                    if let Some(local_id) = dir_attrs.get("localId") {
                        node_attrs["localId"] = serde_json::Value::String(local_id.to_string());
                    }
                    if let Some(params_str) = dir_attrs.get("params") {
                        if let Ok(params_val) =
                            serde_json::from_str::<serde_json::Value>(params_str)
                        {
                            node_attrs["parameters"] = params_val;
                        }
                    }
                }
                node
            }
            _ => {
                if !closed {
                    // `td`/`tr`/`th` (valid only inside `:::table`) and `column`
                    // (valid only inside `:::layout`), or any other name this
                    // parser doesn't otherwise handle, reaching end-of-input
                    // without a close fence. Recognized names above always
                    // return `Some`, so this is the only path that can hit
                    // `Ok(None)` after the scan has already consumed input —
                    // erroring here (rather than silently returning `None`)
                    // keeps that contract intact for `parse_blocks`'s callers
                    // (issue #1734).
                    bail!(
                        "Unclosed `:::{}` directive at line {start_line} — add a matching `:::` close fence",
                        d.name
                    );
                }
                return Ok(None);
            }
        };

        Ok(Some(node))
    }

    fn parse_layout_columns(&self, inner_text: &str) -> Result<Vec<AdfNode>> {
        let mut columns = Vec::new();
        let mut current_column_lines: Vec<String> = Vec::new();
        let mut current_width: serde_json::Value = serde_json::json!(50);
        let mut current_dir_attrs: Option<crate::atlassian::attrs::Attrs> = None;
        let mut in_column = false;
        let mut depth: usize = 0;

        let lines: Vec<&str> = inner_text.lines().collect();
        let mut i = 0;

        while i < lines.len() {
            let line = lines[i];
            if let Some((col_d, _)) = try_parse_container_open(line) {
                if col_d.name == "column" && depth == 0 {
                    // Flush previous column
                    if in_column && !current_column_lines.is_empty() {
                        let col_text = current_column_lines.join("\n");
                        let blocks =
                            MarkdownParser::with_depth(&col_text, self.depth + 1).parse_blocks()?;
                        let mut col = AdfNode::layout_column(current_width.clone(), blocks);
                        pass_through_local_id(&current_dir_attrs, &mut col);
                        columns.push(col);
                        current_column_lines.clear();
                    }
                    current_width = col_d
                        .attrs
                        .as_ref()
                        .and_then(|a| a.get("width"))
                        .and_then(parse_numeric_attr)
                        .unwrap_or_else(|| serde_json::json!(50));
                    current_dir_attrs = col_d.attrs;
                    in_column = true;
                    i += 1;
                    continue;
                }
                if in_column {
                    depth += 1;
                }
            }
            if in_column && is_container_close(line, 3) {
                if depth > 0 {
                    depth -= 1;
                    current_column_lines.push(line.to_string());
                    i += 1;
                    continue;
                }
                // End of column
                let col_text = current_column_lines.join("\n");
                let blocks =
                    MarkdownParser::with_depth(&col_text, self.depth + 1).parse_blocks()?;
                let mut col = AdfNode::layout_column(current_width.clone(), blocks);
                pass_through_local_id(&current_dir_attrs, &mut col);
                columns.push(col);
                current_column_lines.clear();
                current_dir_attrs = None;
                in_column = false;
                i += 1;
                continue;
            }
            if in_column {
                current_column_lines.push(line.to_string());
            }
            i += 1;
        }

        // Flush last column if no closing fence
        if in_column && !current_column_lines.is_empty() {
            let col_text = current_column_lines.join("\n");
            let blocks = MarkdownParser::with_depth(&col_text, self.depth + 1).parse_blocks()?;
            let mut col = AdfNode::layout_column(current_width, blocks);
            pass_through_local_id(&current_dir_attrs, &mut col);
            columns.push(col);
        }

        Ok(columns)
    }

    /// Parses `:::tr` / `:::th` / `:::td` sub-containers inside a `:::table` directive.
    fn parse_directive_table_rows(&self, inner_text: &str) -> Result<Vec<AdfNode>> {
        debug!(
            "parse_directive_table_rows: {} lines of inner text",
            inner_text.lines().count()
        );
        let mut rows = Vec::new();
        let lines: Vec<&str> = inner_text.lines().collect();
        let mut i = 0;

        while i < lines.len() {
            let line = lines[i];
            if let Some((d, _)) = try_parse_container_open(line) {
                if d.name == "tr" {
                    let tr_attrs = d.attrs.clone();
                    i += 1;
                    let (mut row, next_i) = self.parse_directive_table_row(&lines, i)?;
                    // Pass through localId from :::tr{localId=...}
                    if let Some(ref attrs) = tr_attrs {
                        if let Some(local_id) = attrs.get("localId") {
                            let row_attrs = row.attrs.get_or_insert_with(|| serde_json::json!({}));
                            row_attrs["localId"] = serde_json::Value::String(local_id.to_string());
                        }
                    }
                    rows.push(row);
                    i = next_i;
                    continue;
                }
                if d.name == "caption" {
                    let dir_attrs = d.attrs.clone();
                    i += 1;
                    let mut caption_lines = Vec::new();
                    while i < lines.len() {
                        if is_container_close(lines[i], 3) {
                            i += 1;
                            break;
                        }
                        caption_lines.push(lines[i]);
                        i += 1;
                    }
                    let caption_text = caption_lines.join("\n");
                    let inline_nodes = parse_inline(&caption_text);
                    let mut caption = AdfNode::caption(inline_nodes);
                    pass_through_local_id(&dir_attrs, &mut caption);
                    rows.push(caption);
                    continue;
                }
            }
            i += 1;
        }

        Ok(rows)
    }

    /// Parses cells within a `:::tr` container until its closing fence.
    fn parse_directive_table_row(&self, lines: &[&str], start: usize) -> Result<(AdfNode, usize)> {
        let mut cells = Vec::new();
        let mut i = start;
        let mut depth: usize = 0;

        while i < lines.len() {
            let line = lines[i];
            if is_container_close(line, 3) {
                if depth == 0 {
                    // End of :::tr
                    i += 1;
                    break;
                }
                depth -= 1;
                i += 1;
                continue;
            }
            if let Some((d, _)) = try_parse_container_open(line) {
                if depth == 0 && (d.name == "th" || d.name == "td") {
                    let is_header = d.name == "th";
                    let cell_attrs = d.attrs.clone();
                    i += 1;
                    let (cell, next_i) =
                        self.parse_directive_table_cell(lines, i, is_header, cell_attrs)?;
                    cells.push(cell);
                    i = next_i;
                    continue;
                }
                depth += 1;
            }
            i += 1;
        }

        if cells.is_empty() {
            let context = lines[start.saturating_sub(1)..lines.len().min(start + 3)].to_vec();
            warn!(
                "Directive table row at line {start} has no cells — \
                 Confluence requires at least one. Nearby lines: {context:?}"
            );
        }
        debug!("Parsed directive table row: {} cells", cells.len());

        Ok((AdfNode::table_row(cells), i))
    }

    /// Parses the content of a `:::th` or `:::td` cell until its closing fence.
    fn parse_directive_table_cell(
        &self,
        lines: &[&str],
        start: usize,
        is_header: bool,
        cell_attrs: Option<crate::atlassian::attrs::Attrs>,
    ) -> Result<(AdfNode, usize)> {
        let mut cell_lines = Vec::new();
        let mut i = start;
        let mut depth: usize = 0;

        while i < lines.len() {
            let line = lines[i];
            if try_parse_container_open(line).is_some() {
                depth += 1;
            } else if is_container_close(line, 3) {
                if depth == 0 {
                    i += 1;
                    break;
                }
                depth -= 1;
            }
            cell_lines.push(line.to_string());
            i += 1;
        }

        let cell_text = cell_lines.join("\n");
        let blocks = MarkdownParser::with_depth(&cell_text, self.depth + 1).parse_blocks()?;

        let adf_attrs = cell_attrs.as_ref().map(build_cell_attrs);
        let cell_marks = cell_attrs
            .as_ref()
            .map(build_border_marks)
            .unwrap_or_default();

        let cell = if cell_marks.is_empty() {
            if is_header {
                if let Some(attrs) = adf_attrs {
                    AdfNode::table_header_with_attrs(blocks, attrs)
                } else {
                    AdfNode::table_header(blocks)
                }
            } else if let Some(attrs) = adf_attrs {
                AdfNode::table_cell_with_attrs(blocks, attrs)
            } else {
                AdfNode::table_cell(blocks)
            }
        } else if is_header {
            AdfNode::table_header_with_attrs_and_marks(blocks, adf_attrs, cell_marks)
        } else {
            AdfNode::table_cell_with_attrs_and_marks(blocks, adf_attrs, cell_marks)
        };

        Ok((cell, i))
    }

    fn try_leaf_directive(&mut self) -> Option<AdfNode> {
        let line = self.current_line();
        let d = try_parse_leaf_directive(line)?;

        let node = match d.name.as_str() {
            "card" => {
                let content = d.content.as_deref().unwrap_or("");
                // Prefer the `url` attribute when present; fall back to the
                // bracketed content.  The attribute form is used when the URL
                // contains characters that would otherwise break
                // `::card[URL]` parsing.
                let url = match d.attrs.as_ref().and_then(|a| a.get("url")) {
                    Some(u) => u,
                    None => content,
                };
                let mut node = AdfNode::block_card(url);
                // Pass through layout/width attrs
                if let Some(ref attrs) = d.attrs {
                    if let Some(ref mut node_attrs) = node.attrs {
                        if let Some(layout) = attrs.get("layout") {
                            node_attrs["layout"] = serde_json::Value::String(layout.to_string());
                        }
                        if let Some(width) = attrs.get("width") {
                            if let Ok(w) = width.parse::<u64>() {
                                node_attrs["width"] = serde_json::json!(w);
                            }
                        }
                    }
                }
                node
            }
            "embed" => {
                let url = d.content.as_deref().unwrap_or("");
                let layout = d.attrs.as_ref().and_then(|a| a.get("layout"));
                let original_height = d
                    .attrs
                    .as_ref()
                    .and_then(|a| a.get("originalHeight"))
                    .and_then(|v| v.parse::<f64>().ok());
                let width = d
                    .attrs
                    .as_ref()
                    .and_then(|a| a.get("width"))
                    .and_then(|w| w.parse::<f64>().ok());
                AdfNode::embed_card(url, layout, original_height, width)
            }
            "extension" => {
                let ext_type = d.attrs.as_ref().and_then(|a| a.get("type")).unwrap_or("");
                let ext_key = d.attrs.as_ref().and_then(|a| a.get("key")).unwrap_or("");
                let params = d
                    .attrs
                    .as_ref()
                    .and_then(|a| a.get("params"))
                    .and_then(|p| serde_json::from_str(p).ok());
                let mut node = AdfNode::extension(ext_type, ext_key, params);
                if let (Some(ref dir_attrs), Some(ref mut node_attrs)) = (&d.attrs, &mut node.attrs)
                {
                    if let Some(layout) = dir_attrs.get("layout") {
                        node_attrs["layout"] = serde_json::Value::String(layout.to_string());
                    }
                    if let Some(local_id) = dir_attrs.get("localId") {
                        node_attrs["localId"] = serde_json::Value::String(local_id.to_string());
                    }
                }
                node
            }
            "paragraph" => {
                let mut node = if let Some(ref text) = d.content {
                    AdfNode::paragraph(parse_inline(text))
                } else {
                    AdfNode::paragraph(vec![])
                };
                pass_through_local_id(&d.attrs, &mut node);
                node
            }
            _ => return None,
        };

        self.advance();
        Some(node)
    }

    fn try_image(&mut self) -> Option<AdfNode> {
        let line = self.current_line().trim();
        let mut node = try_parse_media_single_from_line(line)?;
        self.advance();

        // Check for a trailing :::caption directive
        if !self.at_end() {
            if let Some((d, _)) = try_parse_container_open(self.current_line()) {
                if d.name == "caption" {
                    let dir_attrs = d.attrs;
                    self.advance(); // past :::caption
                    let mut caption_lines = Vec::new();
                    while !self.at_end() {
                        if is_container_close(self.current_line(), 3) {
                            self.advance(); // past :::
                            break;
                        }
                        caption_lines.push(self.current_line());
                        self.advance();
                    }
                    let caption_text = caption_lines.join("\n");
                    let inline_nodes = parse_inline(&caption_text);
                    let mut caption = AdfNode::caption(inline_nodes);
                    pass_through_local_id(&dir_attrs, &mut caption);
                    if let Some(ref mut content) = node.content {
                        content.push(caption);
                    }
                }
            }
        }

        Some(node)
    }

    fn try_table(&mut self) -> Result<Option<AdfNode>> {
        let line = self.current_line();
        if !line.contains('|') || !line.trim_start().starts_with('|') {
            return Ok(None);
        }

        // Peek ahead to check for a separator row (indicates a table)
        if self.pos + 1 >= self.lines.len() {
            return Ok(None);
        }
        let next_line = self.lines[self.pos + 1];
        if !is_table_separator(next_line) {
            return Ok(None);
        }

        // Parse header row
        let header_cells = parse_table_row(line);
        self.advance(); // skip header

        // Parse separator row for column alignment
        let sep_line = self.current_line();
        let alignments = parse_table_alignments(sep_line);
        self.advance(); // skip separator

        let mut rows = Vec::new();

        // Header row — parse cell attrs and apply column alignment
        let header_adf_cells: Vec<AdfNode> = header_cells
            .iter()
            .enumerate()
            .map(|(col_idx, cell)| {
                let (cell_text, cell_attrs) = extract_cell_attrs(cell);
                let mut para = AdfNode::paragraph(parse_inline(&cell_text));
                apply_column_alignment(&mut para, alignments.get(col_idx).copied().flatten());
                if let Some(attrs) = cell_attrs {
                    AdfNode::table_header_with_attrs(vec![para], attrs)
                } else {
                    AdfNode::table_header(vec![para])
                }
            })
            .collect();
        if header_adf_cells.is_empty() {
            warn!(
                "Pipe table header row at line {} has no cells",
                self.pos - 1
            );
        }
        rows.push(AdfNode::table_row(header_adf_cells));

        // Body rows
        while !self.at_end() {
            let line = self.current_line();
            if !line.contains('|') || line.trim().is_empty() {
                break;
            }

            let cells = parse_table_row(line);
            let adf_cells: Vec<AdfNode> = cells
                .iter()
                .enumerate()
                .map(|(col_idx, cell)| {
                    let (cell_text, cell_attrs) = extract_cell_attrs(cell);
                    let mut para = AdfNode::paragraph(parse_inline(&cell_text));
                    apply_column_alignment(&mut para, alignments.get(col_idx).copied().flatten());
                    if let Some(attrs) = cell_attrs {
                        AdfNode::table_cell_with_attrs(vec![para], attrs)
                    } else {
                        AdfNode::table_cell(vec![para])
                    }
                })
                .collect();
            if adf_cells.is_empty() {
                warn!("Pipe table body row at line {} has no cells", self.pos);
            }
            rows.push(AdfNode::table_row(adf_cells));
            self.advance();
        }

        debug!("Parsed pipe table with {} rows", rows.len());
        let mut table = AdfNode::table(rows);

        // Check for trailing {attrs} on the next line
        if !self.at_end() {
            let next = self.current_line().trim();
            if next.starts_with('{') {
                if let Some((_, attrs)) = parse_attrs(next, 0) {
                    let mut table_attrs = serde_json::json!({});
                    if let Some(layout) = attrs.get("layout") {
                        table_attrs["layout"] = serde_json::Value::String(layout.to_string());
                    }
                    if attrs.has_flag("numbered") {
                        table_attrs["isNumberColumnEnabled"] = serde_json::json!(true);
                    } else if attrs.get("numbered") == Some("false") {
                        table_attrs["isNumberColumnEnabled"] = serde_json::json!(false);
                    }
                    if let Some(tw) = attrs.get("width") {
                        if let Some(w) = parse_numeric_attr(tw) {
                            table_attrs["width"] = w;
                        }
                    }
                    if let Some(local_id) = attrs.get("localId") {
                        table_attrs["localId"] = serde_json::Value::String(local_id.to_string());
                    }
                    if table_attrs != serde_json::json!({}) {
                        table.attrs = Some(table_attrs);
                        self.advance(); // consume the attrs line
                    }
                }
            }
        }

        Ok(Some(table))
    }

    fn parse_paragraph(&mut self) -> Result<AdfNode> {
        let mut lines: Vec<&str> = Vec::new();

        while !self.at_end() {
            let line = self.current_line();
            // Only break on block-level patterns if we already have paragraph
            // content. This prevents infinite loops when a line looks like a
            // block starter but doesn't actually match any block parser (e.g.,
            // "#NoSpace" which is not a valid heading).
            // Issue #494: A whitespace-only line that follows a hardBreak
            // marker (trailing backslash or two trailing spaces) is a
            // continuation, not a paragraph break.  Let it fall through to
            // the `is_hardbreak_cont` check below.
            if (line.trim().is_empty()
                && !lines
                    .last()
                    .is_some_and(|prev| has_trailing_hard_break(prev)))
                || is_code_fence_opener(line)
                || (is_horizontal_rule(line) && !lines.is_empty())
            {
                break;
            }
            // Strip 2-space indent from hardBreak continuation lines so
            // the content round-trips correctly (issue #455).
            let is_hardbreak_cont = !lines.is_empty()
                && line.starts_with("  ")
                && lines
                    .last()
                    .is_some_and(|prev| has_trailing_hard_break(prev));
            if is_hardbreak_cont {
                lines.push(&line[2..]);
                self.advance();
                continue;
            }
            if !lines.is_empty()
                && (line.starts_with('#') || line.starts_with('>') || is_list_start(line))
            {
                break;
            }
            // Break on trailing block attrs like {align=center}
            if !lines.is_empty() && is_block_attrs_line(line) {
                break;
            }
            lines.push(line);
            self.advance();
        }

        let text = lines.join("\n");
        let inline_nodes = parse_inline(&text);
        Ok(AdfNode::paragraph(inline_nodes))
    }
}

/// Builds ADF cell attributes from JFM directive attrs.
/// Maps: `bg` → `background`, `colspan` → number, `rowspan` → number, `colwidth` → array.
fn build_cell_attrs(attrs: &crate::atlassian::attrs::Attrs) -> serde_json::Value {
    let mut adf = serde_json::json!({});
    if let Some(bg) = attrs.get("bg") {
        adf["background"] = serde_json::Value::String(bg.to_string());
    }
    if let Some(colspan) = attrs.get("colspan") {
        if let Ok(n) = colspan.parse::<u32>() {
            adf["colspan"] = serde_json::json!(n);
        }
    }
    if let Some(rowspan) = attrs.get("rowspan") {
        if let Ok(n) = rowspan.parse::<u32>() {
            adf["rowspan"] = serde_json::json!(n);
        }
    }
    if let Some(colwidth) = attrs.get("colwidth") {
        let widths: Vec<serde_json::Value> = colwidth
            .split(',')
            .filter_map(|s| parse_numeric_attr(s.trim()))
            .collect();
        if !widths.is_empty() {
            adf["colwidth"] = serde_json::Value::Array(widths);
        }
    }
    if let Some(local_id) = attrs.get("localId") {
        adf["localId"] = serde_json::Value::String(local_id.to_string());
    }
    adf
}

/// Extracts border marks from directive attributes (used by table cells and media nodes).
fn build_border_marks(attrs: &crate::atlassian::attrs::Attrs) -> Vec<AdfMark> {
    let mut marks = Vec::new();
    let border_color = attrs.get("border-color");
    let border_size = attrs.get("border-size");
    if border_color.is_some() || border_size.is_some() {
        let color = border_color.unwrap_or("#000000");
        let size = border_size.and_then(|s| s.parse::<u32>().ok()).unwrap_or(1);
        marks.push(AdfMark::border(color, size));
    }
    marks
}

/// Converts an ISO 8601 date string (e.g., "2026-04-15") to epoch milliseconds string.
/// If the input is already numeric (epoch ms), returns it unchanged.
fn iso_date_to_epoch_ms(date_str: &str) -> String {
    // If it's already a numeric timestamp, pass through
    if date_str.chars().all(|c| c.is_ascii_digit()) {
        return date_str.to_string();
    }
    if let Ok(date) = NaiveDate::parse_from_str(date_str, "%Y-%m-%d") {
        let epoch_ms = date
            .and_hms_opt(0, 0, 0)
            .map_or(0, |dt| dt.and_utc().timestamp_millis());
        epoch_ms.to_string()
    } else {
        // Fallback: pass through as-is
        date_str.to_string()
    }
}

/// Converts an epoch milliseconds string to an ISO 8601 date string.
/// If the input looks like an ISO date already, returns it unchanged.
fn epoch_ms_to_iso_date(timestamp: &str) -> String {
    // If it looks like an ISO date already, pass through
    if timestamp.contains('-') {
        return timestamp.to_string();
    }
    if let Ok(ms) = timestamp.parse::<i64>() {
        let secs = ms / 1000;
        if let Some(dt) = chrono::DateTime::from_timestamp(secs, 0) {
            return dt.format("%Y-%m-%d").to_string();
        }
    }
    // Fallback: pass through
    timestamp.to_string()
}

/// Checks if a line is a standalone block-level attrs line like `{align=center}`.
fn is_block_attrs_line(line: &str) -> bool {
    let trimmed = line.trim();
    if !trimmed.starts_with('{') || !trimmed.ends_with('}') {
        return false;
    }
    if let Some((_, attrs)) = parse_attrs(trimmed, 0) {
        // Only consider it a block attrs line if it has recognized block attrs
        attrs.get("align").is_some()
            || attrs.get("indent").is_some()
            || attrs.get("breakout").is_some()
            || attrs.get("breakoutWidth").is_some()
            || attrs.get("localId").is_some()
    } else {
        false
    }
}

/// Parses decision items from the inner content of a `:::decisions` container.
/// Each item starts with `- <> ` prefix.
fn parse_decision_items(text: &str) -> Vec<AdfNode> {
    let mut items = Vec::new();
    for line in text.lines() {
        let trimmed = line.trim();
        if let Some(rest) = trimmed.strip_prefix("- <> ") {
            let inline_nodes = parse_inline(rest);
            items.push(AdfNode::decision_item("DECIDED", inline_nodes));
        }
    }
    items
}

/// Tries to parse a task list marker `[ ]`, `[x]`, or `[X]` at the start of text.
/// Returns `("TODO"|"DONE", remaining_text)` on success.
///
/// The marker must be followed by a space or the end of the text, so that
/// empty task items (`- [ ]` with no body) are still recognised as tasks
/// rather than being treated as bullet items containing literal `[ ]` text
/// (issue #548).
fn try_parse_task_marker(text: &str) -> Option<(&str, &str)> {
    if let Some(rest) = strip_task_checkbox(text, "[ ]") {
        Some(("TODO", rest))
    } else if let Some(rest) =
        strip_task_checkbox(text, "[x]").or_else(|| strip_task_checkbox(text, "[X]"))
    {
        Some(("DONE", rest))
    } else {
        None
    }
}

/// Strips a checkbox prefix from `text` if the character after the checkbox
/// is a space or the text ends there.  Returns the remaining text (with the
/// separating space consumed, if any).
fn strip_task_checkbox<'a>(text: &'a str, checkbox: &str) -> Option<&'a str> {
    let rest = text.strip_prefix(checkbox)?;
    if rest.is_empty() {
        Some(rest)
    } else {
        rest.strip_prefix(' ')
    }
}

/// Returns true if `s` begins with a sequence the bullet-list parser would
/// interpret as a task checkbox marker (`[ ]`, `[x]`, or `[X]` followed by
/// a space, newline, or end-of-input).
///
/// Used by the `bulletList` renderer to decide whether to escape the leading
/// `[` of an item whose literal text starts with a checkbox-shaped prefix
/// (issue #548).
fn starts_with_task_marker(s: &str) -> bool {
    let after = if let Some(rest) = s.strip_prefix("[ ]") {
        rest
    } else if let Some(rest) = s.strip_prefix("[x]").or_else(|| s.strip_prefix("[X]")) {
        rest
    } else {
        return false;
    };
    after.is_empty() || after.starts_with(' ') || after.starts_with('\n')
}

/// Parses an ordered list marker like "1. " and returns (number, rest_of_line).
fn parse_ordered_list_marker(line: &str) -> Option<(u32, &str)> {
    let digit_end = line.find(|c: char| !c.is_ascii_digit())?;
    if digit_end == 0 {
        return None;
    }
    let rest = &line[digit_end..];
    let after_marker = rest.strip_prefix(". ")?;
    let num: u32 = line[..digit_end].parse().ok()?;
    Some((num, after_marker))
}

/// Returns true if a line ends with a hardBreak marker
/// (trailing backslash or two trailing spaces).
fn has_trailing_hard_break(line: &str) -> bool {
    line.ends_with('\\') || line.ends_with("  ")
}

/// Returns true if the already-trimmed continuation line starts with a
/// block-level marker that must not be swallowed as a paragraph continuation
/// in `collect_hardbreak_continuations`.
///
/// Covers mediaSingle (`![` — issue #490), fenced code blocks (```` ``` ````
/// — issue #552), and container directives (`:::`).  The caller is expected
/// to have already stripped leading whitespace.
fn is_block_level_continuation_marker(trimmed: &str) -> bool {
    trimmed.starts_with("![") || trimmed.starts_with("```") || trimmed.starts_with(":::")
}

/// Checks if a line starts a list item.
fn is_list_start(line: &str) -> bool {
    let trimmed = line.trim_start();
    trimmed.starts_with("- ")
        || trimmed.starts_with("* ")
        || trimmed.starts_with("+ ")
        || parse_ordered_list_marker(trimmed).is_some()
}

/// Number of leading ASCII spaces — the parser's unit of list indentation.
/// Deliberately not `trim_start()`-based: that would count the bytes of any
/// Unicode whitespace (an NBSP is two), which is not what the 2-space
/// nesting convention measures.
fn leading_spaces(line: &str) -> usize {
    line.bytes().take_while(|&b| b == b' ').count()
}

/// Escapes asterisk and underscore sequences in text that would otherwise be
/// parsed as CommonMark emphasis (`*…*`, `_…_`) or strong emphasis (`**…**`,
/// `__…__`).
///
/// Asterisks are always escaped (they're rare in prose and the JFM parser
/// will gladly match them across node boundaries). Underscores are escaped
/// per the intraword rule: a `_` is left as-is only when it's clearly
/// intraword *within this text node* (alphanumeric on both sides). At the
/// node boundary or next to non-alphanumeric characters we escape, since
/// adjacent text nodes can supply the other side of an emphasis pair (issue
/// #554: `"_ "` followed by colored `"_Action…"` produced `_ :span[_…` which
/// parsed as italic and destroyed the span directive).
fn escape_emphasis_markers(text: &str) -> String {
    escape_emphasis_with(text, false)
}

/// Variant of [`escape_emphasis_markers`] that escapes ALL underscores (even
/// intraword), not just boundary ones.
///
/// Must be used whenever the rendered markdown wraps this text in an `_..._`
/// em delimiter, because an unescaped `_` anywhere in the content would
/// otherwise close the delimiter prematurely (e.g. `_foo_bar_baz_` parses as
/// em("foo") + "bar" + em("baz"), not em("foo_bar_baz")).
fn escape_emphasis_markers_with_underscore(text: &str) -> String {
    escape_emphasis_with(text, true)
}

/// Internal: escapes `*` always, and escapes `_` per the CommonMark intraword
/// rule by default — boundary or punctuation-adjacent runs are escaped, fully
/// intraword runs are left as-is.  When `escape_underscore_always` is true,
/// every `_` is escaped regardless (used when the surrounding context is an
/// `_..._` em delimiter that any inner `_` would close prematurely).
fn escape_emphasis_with(text: &str, escape_underscore_always: bool) -> String {
    let chars: Vec<char> = text.chars().collect();
    let mut out = String::with_capacity(text.len());
    let mut idx = 0;
    while idx < chars.len() {
        let ch = chars[idx];
        if ch == '*' {
            out.push('\\');
            out.push(ch);
            idx += 1;
        } else if ch == '_' {
            // Find the extent of this run of underscores. CommonMark treats
            // consecutive `_` as a single delimiter run, so the intraword
            // check applies to the whole run, not individual characters.
            let run_start = idx;
            let mut run_end = idx;
            while run_end < chars.len() && chars[run_end] == '_' {
                run_end += 1;
            }
            let escape_run = if escape_underscore_always {
                true
            } else {
                let before_alnum = run_start > 0 && chars[run_start - 1].is_alphanumeric();
                let after_alnum = chars.get(run_end).is_some_and(|c| c.is_alphanumeric());
                !(before_alnum && after_alnum)
            };
            for _ in run_start..run_end {
                if escape_run {
                    out.push('\\');
                }
                out.push('_');
            }
            idx = run_end;
        } else {
            out.push(ch);
            idx += 1;
        }
    }
    out
}

/// Escapes backtick characters in text that would otherwise be parsed as
/// inline code spans (`` `…` ``).
///
/// Each backtick is prefixed with a backslash so that the JFM parser treats
/// it as a literal character rather than an inline-code delimiter.
fn escape_backticks(text: &str) -> String {
    let mut out = String::with_capacity(text.len());
    for ch in text.chars() {
        if ch == '`' {
            out.push('\\');
        }
        out.push(ch);
    }
    out
}

/// Chooses a backtick delimiter length and padding flag for rendering `text`
/// as a CommonMark inline code span.
///
/// Per CommonMark: the delimiter must be a run of backticks not equal in
/// length to any run inside the content, and if both ends of the content
/// would start/end with a space (or with a backtick), a single space of
/// padding is added so the span survives the spec's space-stripping rule.
fn inline_code_delimiter(text: &str) -> (usize, bool) {
    let mut max_run = 0usize;
    let mut current = 0usize;
    for ch in text.chars() {
        if ch == '`' {
            current += 1;
            if current > max_run {
                max_run = current;
            }
        } else {
            current = 0;
        }
    }
    let n = max_run + 1;
    let starts_bt = text.starts_with('`');
    let ends_bt = text.ends_with('`');
    let starts_sp = text.starts_with(' ');
    let ends_sp = text.ends_with(' ');
    let all_sp = !text.is_empty() && text.chars().all(|c| c == ' ');
    let needs_pad = starts_bt || ends_bt || (starts_sp && ends_sp && !all_sp);
    (n, needs_pad)
}

/// Appends `text` to `output` wrapped in a CommonMark inline code span whose
/// delimiter length allows any embedded backticks to round-trip unambiguously.
fn render_inline_code(text: &str, output: &mut String) {
    let (n, pad) = inline_code_delimiter(text);
    for _ in 0..n {
        output.push('`');
    }
    if pad {
        output.push(' ');
    }
    output.push_str(text);
    if pad {
        output.push(' ');
    }
    for _ in 0..n {
        output.push('`');
    }
}

/// Escapes pipe characters in text that appears inside a GFM pipe table cell.
///
/// Without this, a literal `|` in cell content (including inside inline code
/// spans) is interpreted as a column separator on round-trip, splitting the
/// cell and corrupting its content (see issue #579).  Each `|` is prefixed
/// with a backslash so the table-row parser treats it as literal.
fn escape_pipes_in_cell(text: &str) -> String {
    let mut out = String::with_capacity(text.len());
    for ch in text.chars() {
        if ch == '|' {
            out.push('\\');
        }
        out.push(ch);
    }
    out
}

/// Escapes square brackets (`[` and `]`) in text that will appear inside a
/// markdown link's `[…]` delimiters.  Without this, a text node containing a
/// literal `[` or `]` can create ambiguous markdown link syntax on round-trip
/// (see issue #493).
fn escape_link_brackets(text: &str) -> String {
    let mut out = String::with_capacity(text.len());
    for ch in text.chars() {
        if ch == '[' || ch == ']' {
            out.push('\\');
        }
        out.push(ch);
    }
    out
}

/// Escapes bare URLs (`http://` and `https://`) in plain text so they are not
/// parsed as `inlineCard` nodes during round-trip.  The leading `h` is
/// backslash-escaped, which is enough to prevent the auto-link detector from
/// matching the URL while the existing backslash-escape handler restores it on
/// re-parse.
fn escape_bare_urls(text: &str) -> String {
    let mut result = String::with_capacity(text.len());
    for (i, ch) in text.char_indices() {
        if ch == 'h' {
            let rest = &text[i..];
            if rest.starts_with("http://") || rest.starts_with("https://") {
                result.push('\\');
            }
        }
        result.push(ch);
    }
    result
}

/// Returns `true` if the string can be embedded in a `:card[...]` (or similar
/// bracketed inline directive) without breaking the depth-based bracket matcher
/// used by [`try_parse_inline_directive`].
///
/// The parser scans the content enclosed in `[...]` treating `[` as +1 and `]`
/// as −1 on depth, closing when depth returns to zero.  A value is safe if
/// every prefix has `count('[') >= count(']') − 1` (i.e., the running depth
/// never dips below zero before the end) and it contains no newline.
fn url_safe_in_bracket_content(s: &str) -> bool {
    if s.contains('\n') {
        return false;
    }
    let mut depth: i32 = 1;
    for ch in s.chars() {
        match ch {
            '[' => depth += 1,
            ']' => {
                depth -= 1;
                if depth == 0 {
                    return false;
                }
            }
            _ => {}
        }
    }
    true
}

/// Escapes emoji shortcode patterns (`:name:`) in plain text so they are not
/// parsed as emoji nodes during round-trip.  Only the leading colon is
/// backslash-escaped, which is enough to prevent the parser from matching the
/// pattern while the existing backslash-escape handler restores it on re-parse.
///
/// The character class for the name segment must match `try_parse_emoji_shortcode`
/// exactly (Unicode `is_alphanumeric` plus `_`, `+`, `-`).  An ASCII-only escape
/// would leave Unicode patterns like `:Café:` or `:ZBC::Acme::配置:` un-escaped
/// while still being detected as emoji on re-parse, splitting the text node
/// (issue #552).
fn escape_emoji_shortcodes(text: &str) -> String {
    let mut result = String::with_capacity(text.len());

    for (i, ch) in text.char_indices() {
        if ch == ':' {
            // Check if this is a `:name:` pattern where name matches the
            // same character class accepted by `try_parse_emoji_shortcode`.
            let after = i + 1;
            if after < text.len() {
                let name_end = text[after..]
                    .find(|c: char| !c.is_alphanumeric() && c != '_' && c != '+' && c != '-')
                    .unwrap_or(text[after..].len());
                if name_end > 0
                    && after + name_end < text.len()
                    && text.as_bytes()[after + name_end] == b':'
                {
                    // Found `:name:` pattern — escape the leading colon
                    result.push('\\');
                }
            }
        }
        result.push(ch);
    }

    result
}

/// Escapes a leading list-marker pattern on a line so it is not
/// re-parsed as a new list item.  `"2. text"` → `"2\. text"`,
/// `"- text"` → `"\- text"`.
fn escape_list_marker(line: &str) -> String {
    if let Some(dot_pos) = line.find(". ") {
        if parse_ordered_list_marker(line).is_some() {
            let mut s = String::with_capacity(line.len() + 1);
            s.push_str(&line[..dot_pos]);
            s.push('\\');
            s.push_str(&line[dot_pos..]);
            return s;
        }
    }
    for prefix in &["- ", "* ", "+ "] {
        if line.starts_with(prefix) {
            let mut s = String::with_capacity(line.len() + 1);
            s.push('\\');
            s.push_str(line);
            return s;
        }
    }
    line.to_string()
}

/// Checks if a line is a valid fenced code block opener.
///
/// Per CommonMark: the opener is a sequence of three or more backticks
/// followed by an info string that must not contain any backtick
/// character, otherwise some inline code spans would be misinterpreted
/// as the beginning of a fenced code block.
fn is_code_fence_opener(line: &str) -> bool {
    if !line.starts_with("```") {
        return false;
    }
    !line[3..].contains('`')
}

/// Checks if a line is a horizontal rule.
fn is_horizontal_rule(line: &str) -> bool {
    let trimmed = line.trim();
    trimmed.len() >= 3
        && ((trimmed.starts_with("---") && trimmed.chars().all(|c| c == '-'))
            || (trimmed.starts_with("***") && trimmed.chars().all(|c| c == '*'))
            || (trimmed.starts_with("___") && trimmed.chars().all(|c| c == '_')))
}

/// Checks if a line is a GFM table separator (e.g., "|---|---|").
fn is_table_separator(line: &str) -> bool {
    let trimmed = line.trim();
    trimmed.contains('|')
        && trimmed
            .chars()
            .all(|c| c == '|' || c == '-' || c == ':' || c == ' ')
}

/// Parses a GFM table row into cell contents.
///
/// Splits on unescaped `|` characters; a preceding backslash (`\|`) is
/// interpreted as a literal pipe and unescaped in the emitted cell content
/// (see issue #579).  This allows code spans and other inline content that
/// contain literal `|` to survive round-trip through a pipe table.
fn parse_table_row(line: &str) -> Vec<String> {
    let trimmed = line.trim();
    let trimmed = trimmed.strip_prefix('|').unwrap_or(trimmed);
    let trimmed = trimmed.strip_suffix('|').unwrap_or(trimmed);

    let mut cells: Vec<String> = Vec::new();
    let mut current = String::new();
    let mut chars = trimmed.chars().peekable();
    while let Some(ch) = chars.next() {
        if ch == '\\' && chars.peek() == Some(&'|') {
            current.push('|');
            chars.next();
        } else if ch == '|' {
            cells.push(std::mem::take(&mut current));
        } else {
            current.push(ch);
        }
    }
    cells.push(current);

    cells
        .iter()
        .map(|s| {
            // Strip exactly one leading and one trailing space (pipe table padding).
            // Preserve any additional whitespace as significant content.
            let stripped = s.strip_prefix(' ').unwrap_or(s.as_str());
            let stripped = stripped.strip_suffix(' ').unwrap_or(stripped);
            stripped.to_string()
        })
        .collect()
}

/// Parses column alignments from a GFM table separator row.
/// Returns a vec of `Option<&str>` where `Some("center")` or `Some("end")` indicate alignment.
fn parse_table_alignments(separator_line: &str) -> Vec<Option<&'static str>> {
    let trimmed = separator_line.trim();
    let trimmed = trimmed.strip_prefix('|').unwrap_or(trimmed);
    let trimmed = trimmed.strip_suffix('|').unwrap_or(trimmed);

    trimmed
        .split('|')
        .map(|cell| {
            let cell = cell.trim();
            let starts_colon = cell.starts_with(':');
            let ends_colon = cell.ends_with(':');
            match (starts_colon, ends_colon) {
                (true, true) => Some("center"),
                (false, true) => Some("end"),
                _ => None, // left/default
            }
        })
        .collect()
}

/// Applies an alignment mark to a paragraph node if alignment is specified.
fn apply_column_alignment(para: &mut AdfNode, alignment: Option<&str>) {
    if let Some(align) = alignment {
        para.marks = Some(vec![AdfMark::alignment(align)]);
    }
}

/// Extracts `{attrs}` prefix from a pipe table cell text.
/// Returns `(remaining_text, Option<adf_attrs_json>)`.
fn extract_cell_attrs(cell_text: &str) -> (String, Option<serde_json::Value>) {
    let trimmed = cell_text.trim_start();
    if !trimmed.starts_with('{') {
        return (cell_text.to_string(), None);
    }
    if let Some((end_pos, attrs)) = parse_attrs(trimmed, 0) {
        let remaining = trimmed[end_pos..].trim_start().to_string();
        let adf_attrs = build_cell_attrs(&attrs);
        (remaining, Some(adf_attrs))
    } else {
        (cell_text.to_string(), None)
    }
}

/// Tries to parse a line as a block-level image and return a mediaSingle ADF node.
/// Used by both `try_image` (top-level blocks) and list item parsing.
fn try_parse_media_single_from_line(line: &str) -> Option<AdfNode> {
    let line = line.trim();
    if !line.starts_with("![") {
        return None;
    }

    let (alt, url) = parse_image_syntax(line)?;
    let alt_opt = if alt.is_empty() { None } else { Some(alt) };

    let paren_open = line.find("](")? + 1; // index of '('
    let img_end = find_closing_paren(line, paren_open)? + 1;
    let after_img = line[img_end..].trim_start();

    if after_img.starts_with('{') {
        if let Some((_, attrs)) = parse_attrs(after_img, 0) {
            // Confluence file attachment — reconstruct type:file media node
            if attrs.get("type") == Some("file") || attrs.get("id").is_some() {
                let mut media_attrs = serde_json::json!({"type": "file"});
                if let Some(id) = attrs.get("id") {
                    media_attrs["id"] = serde_json::Value::String(id.to_string());
                }
                if let Some(collection) = attrs.get("collection") {
                    media_attrs["collection"] = serde_json::Value::String(collection.to_string());
                }
                if let Some(occurrence_key) = attrs.get("occurrenceKey") {
                    media_attrs["occurrenceKey"] =
                        serde_json::Value::String(occurrence_key.to_string());
                }
                if let Some(height) = attrs.get("height") {
                    if let Some(h) = parse_numeric_attr(height) {
                        media_attrs["height"] = h;
                    }
                }
                if let Some(width) = attrs.get("width") {
                    if let Some(w) = parse_numeric_attr(width) {
                        media_attrs["width"] = w;
                    }
                }
                if let Some(alt_text) = alt_opt {
                    media_attrs["alt"] = serde_json::Value::String(alt_text.to_string());
                }
                if let Some(local_id) = attrs.get("localId") {
                    media_attrs["localId"] = serde_json::Value::String(local_id.to_string());
                }
                let mut ms_attrs = serde_json::json!({"layout": "center"});
                if let Some(layout) = attrs.get("layout") {
                    ms_attrs["layout"] = serde_json::Value::String(layout.to_string());
                }
                if let Some(ms_width) = attrs.get("mediaWidth") {
                    if let Some(w) = parse_numeric_attr(ms_width) {
                        ms_attrs["width"] = w;
                    }
                }
                if let Some(wt) = attrs.get("widthType") {
                    ms_attrs["widthType"] = serde_json::Value::String(wt.to_string());
                }
                if let Some(mode) = attrs.get("mode") {
                    ms_attrs["mode"] = serde_json::Value::String(mode.to_string());
                }
                let border_marks = build_border_marks(&attrs);
                let media_marks = if border_marks.is_empty() {
                    None
                } else {
                    Some(border_marks)
                };
                return Some(AdfNode {
                    node_type: "mediaSingle".to_string(),
                    attrs: Some(ms_attrs),
                    content: Some(vec![AdfNode {
                        node_type: "media".to_string(),
                        attrs: Some(media_attrs),
                        content: None,
                        text: None,
                        marks: media_marks,
                        local_id: None,
                        parameters: None,
                    }]),
                    text: None,
                    marks: None,
                    local_id: None,
                    parameters: None,
                });
            }

            // External image — apply layout/width/widthType to mediaSingle attrs
            let mut node = AdfNode::media_single(url, alt_opt);
            if let Some(ref mut node_attrs) = node.attrs {
                if let Some(layout) = attrs.get("layout") {
                    node_attrs["layout"] = serde_json::Value::String(layout.to_string());
                }
                if let Some(width) = attrs.get("width") {
                    if let Some(w) = parse_numeric_attr(width) {
                        node_attrs["width"] = w;
                    }
                }
                if let Some(wt) = attrs.get("widthType") {
                    node_attrs["widthType"] = serde_json::Value::String(wt.to_string());
                }
                if let Some(mode) = attrs.get("mode") {
                    node_attrs["mode"] = serde_json::Value::String(mode.to_string());
                }
            }
            if let Some(ref mut content) = node.content {
                if let Some(media) = content.first_mut() {
                    if let Some(local_id) = attrs.get("localId") {
                        if let Some(ref mut media_attrs) = media.attrs {
                            media_attrs["localId"] =
                                serde_json::Value::String(local_id.to_string());
                        }
                    }
                    let border_marks = build_border_marks(&attrs);
                    if !border_marks.is_empty() {
                        media.marks = Some(border_marks);
                    }
                }
            }
            return Some(node);
        }
    }

    Some(AdfNode::media_single(url, alt_opt))
}

/// Parses `![alt](url)` image syntax.
fn parse_image_syntax(line: &str) -> Option<(&str, &str)> {
    let line = line.trim();
    if !line.starts_with("![") {
        return None;
    }

    let alt_end = line.find("](")?;
    let alt = &line[2..alt_end];
    let paren_start = alt_end + 1; // index of the '('
    let url_end = find_closing_paren(line, paren_start)?;
    let url = &line[paren_start + 1..url_end];

    Some((alt, url))
}

// ── Inline Parsing ──────────────────────────────────────────────────

/// Parses inline markdown content into ADF inline nodes.
///
/// Detects bare URLs (e.g., `https://example.com`) and promotes them to
/// `inlineCard` nodes. Call this at the top level (paragraph, heading, cell,
/// list item) where a bare URL represents a smart link.
fn parse_inline(text: &str) -> Vec<AdfNode> {
    parse_inline_impl(text, true, 0)
}

/// Implementation backing [`parse_inline`] and the inline recursion sites.
///
/// When `auto_inline_card` is `false`, bare `http://`/`https://` URLs are
/// treated as plain text instead of being promoted to `inlineCard` nodes.
/// Recursion into mark-wrapping constructs (emphasis, strike, bracketed
/// spans, links, inline directives) passes `false`: the enclosing syntax
/// already declares the semantic role of the content — a URL inside
/// `[url]{underline}` or `**url**` is the user's text, not a smart link
/// (issue #553).
///
/// `depth` counts those recursion levels.  Past [`MAX_NESTING_DEPTH`] the
/// remaining text is emitted as a plain text node instead of recursing
/// further — inline parsing is infallible, so unlike the block parser it
/// degrades gracefully rather than erroring (issue #1130).
fn parse_inline_impl(text: &str, auto_inline_card: bool, depth: usize) -> Vec<AdfNode> {
    if depth > MAX_NESTING_DEPTH {
        return if text.is_empty() {
            Vec::new()
        } else {
            vec![AdfNode::text(text)]
        };
    }

    let mut nodes = Vec::new();
    let mut chars = text.char_indices().peekable();
    let mut plain_start = 0;

    while let Some(&(i, ch)) = chars.peek() {
        match ch {
            '*' | '_' => {
                if let Some((end, content, is_bold)) = try_parse_emphasis(text, i) {
                    flush_plain(text, plain_start, i, &mut nodes);
                    let mark = if is_bold {
                        AdfMark::strong()
                    } else {
                        AdfMark::em()
                    };
                    let inner = parse_inline_impl(content, false, depth + 1);
                    for mut node in inner {
                        prepend_mark(&mut node, mark.clone());
                        nodes.push(node);
                    }
                    // Advance past the consumed characters
                    while chars.peek().is_some_and(|&(idx, _)| idx < end) {
                        chars.next();
                    }
                    plain_start = end;
                    continue;
                }
                // For underscores, skip the entire delimiter run so that
                // individual `_` chars within a `__` or `___` run are not
                // re-tried as separate emphasis openers (CommonMark treats
                // consecutive underscores as a single delimiter run).
                if ch == '_' {
                    while chars.peek().is_some_and(|&(_, c)| c == '_') {
                        chars.next();
                    }
                } else {
                    chars.next();
                }
            }
            '~' => {
                if let Some((end, content)) = try_parse_strikethrough(text, i) {
                    flush_plain(text, plain_start, i, &mut nodes);
                    let inner = parse_inline_impl(content, false, depth + 1);
                    for mut node in inner {
                        prepend_mark(&mut node, AdfMark::strike());
                        nodes.push(node);
                    }
                    while chars.peek().is_some_and(|&(idx, _)| idx < end) {
                        chars.next();
                    }
                    plain_start = end;
                    continue;
                }
                chars.next();
            }
            '`' => {
                if let Some((end, content)) = try_parse_inline_code(text, i) {
                    flush_plain(text, plain_start, i, &mut nodes);
                    nodes.push(AdfNode::text_with_marks(content, vec![AdfMark::code()]));
                    while chars.peek().is_some_and(|&(idx, _)| idx < end) {
                        chars.next();
                    }
                    plain_start = end;
                    continue;
                }
                // No code span starting here; skip past the entire backtick
                // run so a longer opening run isn't retried as a shorter one.
                while chars.peek().is_some_and(|&(_, c)| c == '`') {
                    chars.next();
                }
            }
            '[' => {
                if let Some((end, link_text, href)) = try_parse_link(text, i) {
                    flush_plain(text, plain_start, i, &mut nodes);
                    if link_text.starts_with("http://") || link_text.starts_with("https://") {
                        // URL-as-link-text: emit as text with link mark,
                        // not via parse_inline which would produce an inlineCard.
                        // Covers both exact matches and trailing-slash mismatches
                        // (issue #523).
                        nodes.push(AdfNode::text_with_marks(
                            link_text,
                            vec![AdfMark::link(href)],
                        ));
                    } else {
                        let inner = parse_inline_impl(link_text, false, depth + 1);
                        for mut node in inner {
                            prepend_mark(&mut node, AdfMark::link(href));
                            nodes.push(node);
                        }
                    }
                    while chars.peek().is_some_and(|&(idx, _)| idx < end) {
                        chars.next();
                    }
                    plain_start = end;
                    continue;
                }
                // Try bracketed span with attributes: [text]{underline}
                if let Some((end, span_nodes)) = try_parse_bracketed_span(text, i, depth) {
                    flush_plain(text, plain_start, i, &mut nodes);
                    nodes.extend(span_nodes);
                    while chars.peek().is_some_and(|&(idx, _)| idx < end) {
                        chars.next();
                    }
                    plain_start = end;
                    continue;
                }
                chars.next();
            }
            ':' => {
                // Try generic inline directive (:card[url], :status[text]{attrs}, etc.)
                if let Some(node) = try_dispatch_inline_directive(text, i, depth) {
                    flush_plain(text, plain_start, i, &mut nodes);
                    let end = node.1;
                    nodes.push(node.0);
                    while chars.peek().is_some_and(|&(idx, _)| idx < end) {
                        chars.next();
                    }
                    plain_start = end;
                    continue;
                }
                // Try emoji shortcode :name: with optional {attrs}
                if let Some((end, short_name)) = try_parse_emoji_shortcode(text, i) {
                    flush_plain(text, plain_start, i, &mut nodes);
                    let (final_end, emoji_node) = parse_emoji_with_attrs(text, end, short_name);
                    nodes.push(emoji_node);
                    while chars.peek().is_some_and(|&(idx, _)| idx < final_end) {
                        chars.next();
                    }
                    plain_start = final_end;
                    continue;
                }
                chars.next();
            }
            ' ' if text[i..].starts_with("  \n") => {
                // Trailing-space line break → hardBreak node.
                // Flush preceding text (without the trailing spaces).
                flush_plain(text, plain_start, i, &mut nodes);
                nodes.push(AdfNode::hard_break());
                // Skip past all spaces and the newline
                while chars.peek().is_some_and(|&(_, c)| c == ' ') {
                    chars.next();
                }
                // Skip the newline
                if chars.peek().is_some_and(|&(_, c)| c == '\n') {
                    chars.next();
                }
                plain_start = chars.peek().map_or(text.len(), |&(idx, _)| idx);
            }
            '!' if text[i..].starts_with("![") => {
                // Inline image — skip the ! and let [ handle it next iteration
                // (Images at block level are handled by try_image; inline images
                // degrade to link text in ADF since inline media is complex)
                chars.next();
            }
            'h' if auto_inline_card
                && (text[i..].starts_with("http://") || text[i..].starts_with("https://")) =>
            {
                if let Some((end, url)) = try_parse_bare_url(text, i) {
                    flush_plain(text, plain_start, i, &mut nodes);
                    nodes.push(AdfNode::inline_card(url));
                    while chars.peek().is_some_and(|&(idx, _)| idx < end) {
                        chars.next();
                    }
                    plain_start = end;
                    continue;
                }
                chars.next();
            }
            '\\' if text.as_bytes().get(i + 1) == Some(&b'n')
                && text.as_bytes().get(i + 2) != Some(&b'\n') =>
            {
                // Issue #454: `\n` (backslash + letter n) encodes a literal
                // newline inside a text node. Emit the newline as a separate
                // text node so merge_adjacent_text can reassemble it.
                flush_plain(text, plain_start, i, &mut nodes);
                nodes.push(AdfNode::text("\n"));
                chars.next(); // consume the '\'
                chars.next(); // consume the 'n'
                plain_start = chars.peek().map_or(text.len(), |&(idx, _)| idx);
            }
            '\\' if i + 1 < text.len() && !text[i..].starts_with("\\\n") => {
                // Backslash escape: skip the backslash and treat the next
                // character as literal text (e.g. `\\` → `\`,
                // `2\. text` → `2. text`, `\*word\*` → `*word*` without
                // emphasis, `\:fire:` → `:fire:` without emoji parsing).
                flush_plain(text, plain_start, i, &mut nodes);
                chars.next(); // consume the backslash
                              // Set plain_start to the escaped character so it is included
                              // in the next plain-text run, then advance past it so it is
                              // not re-interpreted as a special character (e.g. `*`, `_`, `:`).
                plain_start = chars.peek().map_or(text.len(), |&(idx, _)| idx);
                chars.next(); // consume the escaped character
            }
            '\\' if text[i..].starts_with("\\\n") => {
                // Backslash line break → hardBreak node.
                flush_plain(text, plain_start, i, &mut nodes);
                nodes.push(AdfNode::hard_break());
                chars.next(); // consume the '\'
                              // Skip the newline
                if chars.peek().is_some_and(|&(_, c)| c == '\n') {
                    chars.next();
                }
                plain_start = chars.peek().map_or(text.len(), |&(idx, _)| idx);
            }
            '\\' if i + 1 == text.len() => {
                // Trailing backslash at end of paragraph text → hardBreak node.
                flush_plain(text, plain_start, i, &mut nodes);
                nodes.push(AdfNode::hard_break());
                chars.next(); // consume the '\'
                plain_start = text.len();
            }
            _ => {
                chars.next();
            }
        }
    }

    // Flush remaining plain text
    if plain_start < text.len() {
        let remaining = &text[plain_start..];
        if !remaining.is_empty() {
            nodes.push(AdfNode::text(remaining));
        }
    }

    // Merge adjacent unmarked text nodes that can arise from backslash
    // escape handling (e.g. `"2"` + `". text"` → `"2. text"`).
    merge_adjacent_text(&mut nodes);

    nodes
}

/// Merges consecutive unmarked text nodes in-place.
fn merge_adjacent_text(nodes: &mut Vec<AdfNode>) {
    let mut i = 0;
    while i + 1 < nodes.len() {
        if nodes[i].node_type == "text"
            && nodes[i + 1].node_type == "text"
            && nodes[i].marks.is_none()
            && nodes[i + 1].marks.is_none()
        {
            let next_text = nodes[i + 1].text.clone().unwrap_or_default();
            if let Some(ref mut t) = nodes[i].text {
                t.push_str(&next_text);
            }
            nodes.remove(i + 1);
        } else {
            i += 1;
        }
    }
}

/// Flushes accumulated plain text as a text node.
fn flush_plain(text: &str, start: usize, end: usize, nodes: &mut Vec<AdfNode>) {
    if start < end {
        let plain = &text[start..end];
        if !plain.is_empty() {
            nodes.push(AdfNode::text(plain));
        }
    }
}

/// Adds a mark to a node (creates marks vec if needed).
#[cfg(test)]
fn add_mark(node: &mut AdfNode, mark: AdfMark) {
    if let Some(ref mut marks) = node.marks {
        marks.push(mark);
    } else {
        node.marks = Some(vec![mark]);
    }
}

/// Removes `code` marks from heading inline content, returning the count
/// removed.
///
/// ADF's `heading` content model forbids the `code` mark (a heading styles
/// its own text), but JFM/CommonMark parses inline-code spans inside
/// `#`-headings. Stripping here keeps the text as plain — a lossy but safe
/// direction, since Atlassian renders no inline-code styling on headings —
/// rather than building a document the validator only rejects at write time
/// (issue #1005). Recurses into `content` to be robust to future inline
/// containers; today heading inline content is flat text nodes.
fn strip_heading_code_marks(nodes: &mut [AdfNode]) -> usize {
    let mut removed = 0;
    for node in nodes.iter_mut() {
        if let Some(marks) = node.marks.as_mut() {
            let before = marks.len();
            marks.retain(|m| m.mark_type != "code");
            removed += before - marks.len();
            if marks.is_empty() {
                node.marks = None;
            }
        }
        if let Some(children) = node.content.as_mut() {
            removed += strip_heading_code_marks(children);
        }
    }
    removed
}

/// Marks that markdown emphasis syntax can layer onto an inline-code run but
/// that ADF forbids combining with `code` (issue #1391). Deliberately not the
/// full complement of marks illegal with `code`: span-syntax marks
/// (`underline`, `textColor`, …) are explicit author requests and are left
/// for the validator to report.
const EMPHASIS_MARKS_SPLIT_FROM_CODE: [&str; 3] = ["strong", "em", "strike"];

/// Drops `strong`/`em`/`strike` marks from text runs that also carry `code`,
/// returning the count dropped.
///
/// ADF allows `code` to combine only with `link` and `annotation`, so
/// ``**`x`**``-shaped JFM used to fail validation at write time. Inline code
/// always parses into its own run, so the sibling runs produced by the same
/// emphasis span keep their marks — dropping the leaked marks here is the
/// "split into adjacent legal runs" of issue #1391, and rendering is
/// visually unchanged (the code font dominates inside a bold/italic
/// sentence). Must run at the document level, after block building: heading
/// runs are already code-free via [`strip_heading_code_marks`] by then, so
/// a bold heading around inline code keeps its bold.
fn split_emphasis_code_marks(nodes: &mut [AdfNode]) -> usize {
    let mut dropped = 0;
    for node in nodes.iter_mut() {
        if let Some(marks) = node.marks.as_mut() {
            if node.text.is_some() && marks.iter().any(|m| m.mark_type == "code") {
                let before = marks.len();
                marks.retain(|m| !EMPHASIS_MARKS_SPLIT_FROM_CODE.contains(&m.mark_type.as_str()));
                dropped += before - marks.len();
            }
        }
        if let Some(children) = node.content.as_mut() {
            dropped += split_emphasis_code_marks(children);
        }
    }
    dropped
}

/// Prepends a mark before existing marks to preserve outside-in ordering.
fn prepend_mark(node: &mut AdfNode, mark: AdfMark) {
    if let Some(ref mut marks) = node.marks {
        marks.insert(0, mark);
    } else {
        node.marks = Some(vec![mark]);
    }
}

/// Returns `true` when an underscore delimiter run of `len` bytes starting at
/// byte position `delim_pos` in `text` is flanked by alphanumeric characters on
/// **both** sides — meaning it sits inside a word and must NOT open or close an
/// emphasis span per CommonMark.
fn is_intraword_underscore(text: &str, delim_pos: usize, len: usize) -> bool {
    let before = text[..delim_pos]
        .chars()
        .next_back()
        .is_some_and(char::is_alphanumeric);
    let after = text[delim_pos + len..]
        .chars()
        .next()
        .is_some_and(char::is_alphanumeric);
    before && after
}

/// Finds the first occurrence of `needle` in `haystack`, skipping over
/// backslash-escaped characters (e.g. `\*` is not matched when searching
/// for `*`).
fn find_unescaped(haystack: &str, needle: &str) -> Option<usize> {
    let needle_bytes = needle.as_bytes();
    let hay_bytes = haystack.as_bytes();
    let mut i = 0;
    while i < hay_bytes.len() {
        if hay_bytes[i] == b'\\' {
            i += 2; // skip escaped character
            continue;
        }
        if hay_bytes[i..].starts_with(needle_bytes) {
            return Some(i);
        }
        i += 1;
    }
    None
}

/// Finds the first occurrence of a single byte `ch` in `haystack`, skipping
/// over backslash-escaped characters.
fn find_unescaped_char(haystack: &str, ch: u8) -> Option<usize> {
    let hay_bytes = haystack.as_bytes();
    let mut i = 0;
    while i < hay_bytes.len() {
        if hay_bytes[i] == b'\\' {
            i += 2;
            continue;
        }
        if hay_bytes[i] == ch {
            return Some(i);
        }
        i += 1;
    }
    None
}

/// Tries to parse ***bold+italic***, **bold**, *italic* (or underscore variants) starting at position `i`.
/// Returns (end_position, inner_content, is_bold).
///
/// The triple-delimiter case (`***` / `___`) is checked first so that `***text***` is parsed as
/// bold wrapping italic content, rather than having the `**` branch consume the wrong closing
/// delimiter and leave stray `*` characters in the text (see issue #401).
///
/// For underscore delimiters, intraword positions are rejected per CommonMark: a `_` flanked
/// by alphanumeric characters on both sides must not open or close emphasis (see issue #438).
fn try_parse_emphasis(text: &str, i: usize) -> Option<(usize, &str, bool)> {
    let rest = &text[i..];

    // Bold+italic: *** or ___
    // Parse as bold wrapping italic: the inner content will be recursively parsed and pick up
    // the inner * / _ as an em mark.
    if rest.starts_with("***") || rest.starts_with("___") {
        let is_underscore = rest.starts_with("___");
        if is_underscore && is_intraword_underscore(text, i, 3) {
            return None;
        }
        let triple = &rest[..3];
        let after = &rest[3..];
        if let Some(close) = find_unescaped(after, triple) {
            if close > 0 {
                let close_pos = i + 3 + close;
                if is_underscore && is_intraword_underscore(text, close_pos, 3) {
                    return None;
                }
                // Return a slice that includes the inner italic delimiters from the
                // original text: for `***text***`, return `*text*`.  The recursive
                // parse_inline call will then pick up the inner `*…*` as an em mark.
                let content = &rest[2..=3 + close];
                let end = i + 3 + close + 3;
                return Some((end, content, true));
            }
        }
    }

    // Bold: ** or __
    if rest.starts_with("**") || rest.starts_with("__") {
        let is_underscore = rest.starts_with("__");
        if is_underscore && is_intraword_underscore(text, i, 2) {
            return None;
        }
        let delimiter = &rest[..2];
        let after = &rest[2..];
        let close = find_unescaped(after, delimiter)?;
        if close == 0 {
            return None;
        }
        let close_pos = i + 2 + close;
        if is_underscore && is_intraword_underscore(text, close_pos, 2) {
            return None;
        }
        let content = &after[..close];
        let end = i + 2 + close + 2;
        return Some((end, content, true));
    }

    // Italic: * or _
    if rest.starts_with('*') || rest.starts_with('_') {
        let delim_char = rest.as_bytes()[0];
        let is_underscore = delim_char == b'_';
        if is_underscore && is_intraword_underscore(text, i, 1) {
            return None;
        }
        let after = &rest[1..];
        let close = find_unescaped_char(after, delim_char)?;
        if close == 0 {
            return None;
        }
        let close_pos = i + 1 + close;
        if is_underscore && is_intraword_underscore(text, close_pos, 1) {
            return None;
        }
        let content = &after[..close];
        let end = i + 1 + close + 1;
        return Some((end, content, false));
    }

    None
}

/// Tries to parse ~~strikethrough~~ starting at position `i`.
fn try_parse_strikethrough(text: &str, i: usize) -> Option<(usize, &str)> {
    let rest = &text[i..];
    if !rest.starts_with("~~") {
        return None;
    }
    let after = &rest[2..];
    let close = after.find("~~")?;
    if close == 0 {
        return None;
    }
    let content = &after[..close];
    Some((i + 2 + close + 2, content))
}

/// Tries to parse a CommonMark inline code span starting at position `i`.
///
/// Supports multi-backtick delimiters: the opening run of N backticks must
/// be matched by a closing run of exactly N backticks.  If both ends of the
/// enclosed content begin and end with a space and the content is not all
/// spaces, one space is stripped from each side per the CommonMark spec.
fn try_parse_inline_code(text: &str, i: usize) -> Option<(usize, &str)> {
    let rest = &text[i..];
    let bytes = rest.as_bytes();
    if bytes.is_empty() || bytes[0] != b'`' {
        return None;
    }
    let mut opening = 0usize;
    while opening < bytes.len() && bytes[opening] == b'`' {
        opening += 1;
    }

    let mut j = opening;
    while j < bytes.len() {
        if bytes[j] == b'`' {
            let run_start = j;
            while j < bytes.len() && bytes[j] == b'`' {
                j += 1;
            }
            if j - run_start == opening {
                let content = &rest[opening..run_start];
                let content = strip_code_span_padding(content);
                return Some((i + j, content));
            }
        } else {
            j += 1;
        }
    }
    None
}

/// Implements the CommonMark code-span space-stripping rule: if the content
/// both begins and ends with a space character and is not composed entirely
/// of spaces, one space character is removed from each side.
fn strip_code_span_padding(content: &str) -> &str {
    let bytes = content.as_bytes();
    if bytes.len() >= 2
        && bytes[0] == b' '
        && bytes[bytes.len() - 1] == b' '
        && content.bytes().any(|b| b != b' ')
    {
        &content[1..content.len() - 1]
    } else {
        content
    }
}

/// Tries to parse a bracketed span `[text]{attrs}` starting at position `i`.
/// Used for `[text]{underline}` and similar constructs.  `depth` is the
/// caller's inline recursion depth (see [`parse_inline_impl`]).
fn try_parse_bracketed_span(text: &str, i: usize, depth: usize) -> Option<(usize, Vec<AdfNode>)> {
    let rest = &text[i..];
    if !rest.starts_with('[') {
        return None;
    }

    // Find the matching ] by counting bracket depth (supports nested brackets
    // such as [[text](url)]{underline} for underline-before-link ordering).
    // Backslash-escaped brackets are skipped (issue #493).
    let mut bracket_depth: usize = 0;
    let mut bracket_close = None;
    let bs_bytes = rest.as_bytes();
    for (j, ch) in rest.char_indices() {
        match ch {
            '\\' if j + 1 < bs_bytes.len()
                && (bs_bytes[j + 1] == b'[' || bs_bytes[j + 1] == b']') => {}
            '[' if j == 0 || bs_bytes[j - 1] != b'\\' => bracket_depth += 1,
            ']' if j == 0 || bs_bytes[j - 1] != b'\\' => {
                bracket_depth -= 1;
                if bracket_depth == 0 {
                    bracket_close = Some(j);
                    break;
                }
            }
            _ => {}
        }
    }
    let bracket_close = bracket_close?;
    // Make sure this isn't a link: next char after ] must be { not (
    let after_bracket = &rest[bracket_close + 1..];
    if !after_bracket.starts_with('{') {
        return None;
    }

    let span_text = &rest[1..bracket_close];
    let attrs_start = i + bracket_close + 1;
    let (attrs_end, attrs) = parse_attrs(text, attrs_start)?;

    let mut marks = Vec::new();
    if attrs.has_flag("underline") {
        marks.push(AdfMark::underline());
    }
    let ann_ids = attrs.get_all("annotation-id");
    let ann_types = attrs.get_all("annotation-type");
    for (idx, ann_id) in ann_ids.iter().enumerate() {
        let ann_type = ann_types.get(idx).copied().unwrap_or("inlineComment");
        marks.push(AdfMark::annotation(ann_id, ann_type));
    }

    if marks.is_empty() {
        return None; // no recognized marks
    }

    let inner = parse_inline_impl(span_text, false, depth + 1);
    let result: Vec<AdfNode> = inner
        .into_iter()
        .map(|mut node| {
            // Prepend bracket marks before inner marks to preserve original
            // ADF mark ordering (e.g., [underline, strong] not [strong, underline]).
            let mut combined = marks.clone();
            if let Some(ref existing) = node.marks {
                combined.extend(existing.iter().cloned());
            }
            node.marks = Some(combined);
            node
        })
        .collect();

    Some((attrs_end, result))
}

/// Dispatches an inline directive to the appropriate ADF node constructor.
/// Returns `(AdfNode, end_pos)` on success.  `depth` is the caller's inline
/// recursion depth (see [`parse_inline_impl`]).
fn try_dispatch_inline_directive(text: &str, pos: usize, depth: usize) -> Option<(AdfNode, usize)> {
    let d = try_parse_inline_directive(text, pos)?;
    let content = d.content.as_deref().unwrap_or("");

    let node = match d.name.as_str() {
        "card" => {
            // Prefer the `url` attribute when present; fall back to the
            // bracketed content.  The attribute form is used when the URL
            // contains characters (such as `]` or `\n`) that would otherwise
            // break `:card[URL]` parsing.
            let url = d
                .attrs
                .as_ref()
                .and_then(|a| a.get("url"))
                .unwrap_or(content);
            let mut node = AdfNode::inline_card(url);
            pass_through_local_id(&d.attrs, &mut node);
            node
        }
        "status" => {
            let color = d
                .attrs
                .as_ref()
                .and_then(|a| a.get("color"))
                .unwrap_or("neutral");
            let mut node = AdfNode::status(content, color);
            // Pass through style and localId if present
            if let Some(ref attrs) = d.attrs {
                if let Some(ref mut node_attrs) = node.attrs {
                    if let Some(style) = attrs.get("style") {
                        node_attrs["style"] = serde_json::Value::String(style.to_string());
                    }
                    if let Some(local_id) = attrs.get("localId") {
                        node_attrs["localId"] = serde_json::Value::String(local_id.to_string());
                    }
                }
            }
            node
        }
        "date" => {
            let timestamp = d
                .attrs
                .as_ref()
                .and_then(|a| a.get("timestamp"))
                .map_or_else(|| iso_date_to_epoch_ms(content), ToString::to_string);
            let mut node = AdfNode::date(&timestamp);
            pass_through_local_id(&d.attrs, &mut node);
            node
        }
        "mention" => {
            let id = d.attrs.as_ref().and_then(|a| a.get("id")).unwrap_or("");
            let mut node = AdfNode::mention(id, content);
            // Pass through optional userType and accessLevel
            if let Some(ref attrs) = d.attrs {
                if let (Some(ref mut node_attrs), true) = (
                    &mut node.attrs,
                    attrs.get("userType").is_some() || attrs.get("accessLevel").is_some(),
                ) {
                    if let Some(ut) = attrs.get("userType") {
                        node_attrs["userType"] = serde_json::Value::String(ut.to_string());
                    }
                    if let Some(al) = attrs.get("accessLevel") {
                        node_attrs["accessLevel"] = serde_json::Value::String(al.to_string());
                    }
                }
            }
            pass_through_local_id(&d.attrs, &mut node);
            node
        }
        "span" => {
            let mut marks = Vec::new();
            if let Some(ref attrs) = d.attrs {
                if let Some(color) = attrs.get("color") {
                    marks.push(AdfMark::text_color(color));
                }
                if let Some(bg) = attrs.get("bg") {
                    marks.push(AdfMark::background_color(bg));
                }
                if attrs.has_flag("sub") {
                    marks.push(AdfMark::subsup("sub"));
                }
                if attrs.has_flag("sup") {
                    marks.push(AdfMark::subsup("sup"));
                }
            }
            if marks.is_empty() {
                AdfNode::text(content)
            } else {
                // Parse inner content to handle nested syntax (e.g., links).
                // Prepend span marks before inner marks to preserve ordering.
                let inner = parse_inline_impl(content, false, depth + 1);
                let mut nodes: Vec<AdfNode> = inner
                    .into_iter()
                    .map(|mut node| {
                        let mut combined = marks.clone();
                        if let Some(ref existing) = node.marks {
                            combined.extend(existing.iter().cloned());
                        }
                        node.marks = Some(combined);
                        node
                    })
                    .collect();
                // Return the first marked node (typical case is a single node).
                nodes.remove(0)
            }
        }
        "placeholder" => AdfNode::placeholder(content),
        "media-inline" => {
            let mut json_attrs = serde_json::Map::new();
            if let Some(ref attrs) = d.attrs {
                for key in &["type", "id", "collection", "url", "alt", "width", "height"] {
                    if let Some(val) = attrs.get(key) {
                        if *key == "width" || *key == "height" {
                            if let Ok(n) = val.parse::<u64>() {
                                json_attrs.insert(
                                    (*key).to_string(),
                                    serde_json::Value::Number(n.into()),
                                );
                                continue;
                            }
                        }
                        json_attrs.insert(
                            (*key).to_string(),
                            serde_json::Value::String(val.to_string()),
                        );
                    }
                }
                if let Some(local_id) = attrs.get("localId") {
                    json_attrs.insert(
                        "localId".to_string(),
                        serde_json::Value::String(local_id.to_string()),
                    );
                }
            }
            AdfNode::media_inline(serde_json::Value::Object(json_attrs))
        }
        "extension" => {
            let ext_type = d.attrs.as_ref().and_then(|a| a.get("type")).unwrap_or("");
            let ext_key = d.attrs.as_ref().and_then(|a| a.get("key")).unwrap_or("");
            AdfNode::inline_extension(ext_type, ext_key, Some(content))
        }
        "adf-unsupported" => {
            // Round-trips an unsupported inline node emitted by
            // `render_non_text_inline_body`: the full node JSON rides in the
            // `json` attribute (the inline mirror of the block-level
            // ```adf-unsupported``` fence reader, ADR-0029 / issue #1117).
            // Deserialize it straight back into the original node; a malformed
            // or missing payload falls through to plain text, exactly like the
            // block reader degrading to a normal code block.
            let json = d.attrs.as_ref().and_then(|a| a.get("json"))?;
            serde_json::from_str::<AdfNode>(json).ok()?
        }
        _ => return None, // unknown directive — fall through to plain text
    };

    Some((node, d.end_pos))
}

/// Tries to parse a bare URL (`http://` or `https://`) starting at position `i`.
/// Scans forward until whitespace, `)`, `]`, or end of string.
fn try_parse_bare_url(text: &str, i: usize) -> Option<(usize, &str)> {
    let rest = &text[i..];
    if !rest.starts_with("http://") && !rest.starts_with("https://") {
        return None;
    }
    // URL extends to the next whitespace or delimiter
    let end = rest
        .find(|c: char| c.is_whitespace() || c == ')' || c == ']' || c == '>')
        .unwrap_or(rest.len());
    // Strip trailing punctuation that's likely not part of the URL
    let url = rest[..end].trim_end_matches(['.', ',', ';', '!', '?']);
    if url.len() <= "https://".len() {
        return None; // too short to be a real URL
    }
    Some((i + url.len(), url))
}

/// Tries to parse an emoji shortcode `:name:` starting at position `i`.
/// The name must match `[a-zA-Z0-9_+-]+`.
fn try_parse_emoji_shortcode(text: &str, i: usize) -> Option<(usize, &str)> {
    let rest = &text[i..];
    if !rest.starts_with(':') {
        return None;
    }
    let after = &rest[1..];
    let name_end =
        after.find(|c: char| !c.is_alphanumeric() && c != '_' && c != '+' && c != '-')?;
    if name_end == 0 {
        return None;
    }
    if after.as_bytes().get(name_end) != Some(&b':') {
        return None;
    }
    let name = &after[..name_end];
    Some((i + 1 + name_end + 1, name))
}

/// Parses an emoji shortcode that has already been matched, then checks for
/// trailing `{id="..." text="..."}` attributes to preserve round-trip fidelity.
fn parse_emoji_with_attrs(text: &str, shortcode_end: usize, short_name: &str) -> (usize, AdfNode) {
    // Issue #576: An emoji with a combined shortName like `:slightly_smiling_face::bow:`
    // is emitted as `:slightly_smiling_face::bow:{shortName="..." ...}`. Extend the
    // match through any adjacent `:name:` shortcodes so that a trailing directive
    // attaches to the whole chain as a single emoji, using the directive's shortName.
    let mut chain_end = shortcode_end;
    while let Some((next_end, _)) = try_parse_emoji_shortcode(text, chain_end) {
        chain_end = next_end;
    }
    if chain_end > shortcode_end {
        if let Some((attr_end, attrs)) = parse_attrs(text, chain_end) {
            return (attr_end, build_emoji_node(&attrs, short_name));
        }
    }

    if let Some((attr_end, attrs)) = parse_attrs(text, shortcode_end) {
        (attr_end, build_emoji_node(&attrs, short_name))
    } else {
        (shortcode_end, AdfNode::emoji(&format!(":{short_name}:")))
    }
}

/// Builds an emoji `AdfNode` from parsed directive attrs, falling back to
/// the matched shortcode name when `shortName` is absent from the directive.
fn build_emoji_node(attrs: &Attrs, short_name: &str) -> AdfNode {
    let resolved_name = attrs
        .get("shortName")
        .map_or_else(|| format!(":{short_name}:"), str::to_string);
    let mut emoji_attrs = serde_json::json!({ "shortName": resolved_name });
    if let Some(id) = attrs.get("id") {
        emoji_attrs["id"] = serde_json::Value::String(id.to_string());
    }
    if let Some(t) = attrs.get("text") {
        emoji_attrs["text"] = serde_json::Value::String(t.to_string());
    }
    if let Some(lid) = attrs.get("localId") {
        emoji_attrs["localId"] = serde_json::Value::String(lid.to_string());
    }
    AdfNode {
        node_type: "emoji".to_string(),
        attrs: Some(emoji_attrs),
        content: None,
        text: None,
        marks: None,
        local_id: None,
        parameters: None,
    }
}

/// Finds the closing `)` that matches the opening `(` at position `open`,
/// counting nested parentheses so that URLs containing `(` and `)` are
/// handled correctly.  Returns the index of the matching `)` relative to
/// the start of `s`, or `None` if no match is found.
fn find_closing_paren(s: &str, open: usize) -> Option<usize> {
    let mut depth: usize = 0;
    for (j, ch) in s[open..].char_indices() {
        match ch {
            '(' => depth += 1,
            ')' => {
                depth -= 1;
                if depth == 0 {
                    return Some(open + j);
                }
            }
            _ => {}
        }
    }
    None
}

/// Tries to parse [text](url) starting at position `i`.
///
/// Uses bracket depth counting to find the matching `]`, so that `[` characters
/// inside the text (e.g. `[Task] some text ([Link](url))`) don't cause a false
/// match on an earlier `](`.
fn try_parse_link(text: &str, i: usize) -> Option<(usize, &str, &str)> {
    let rest = &text[i..];
    if !rest.starts_with('[') {
        return None;
    }

    // Find the matching ] by counting bracket depth, skipping escaped brackets
    let mut depth: usize = 0;
    let mut text_end = None;
    let bytes = rest.as_bytes();
    for (j, ch) in rest.char_indices() {
        match ch {
            '\\' if j + 1 < bytes.len() && (bytes[j + 1] == b'[' || bytes[j + 1] == b']') => {
                // Skip backslash-escaped bracket (issue #493)
            }
            '[' if j == 0 || bytes[j - 1] != b'\\' => depth += 1,
            ']' if j == 0 || bytes[j - 1] != b'\\' => {
                depth -= 1;
                if depth == 0 {
                    text_end = Some(j);
                    break;
                }
            }
            _ => {}
        }
    }

    let text_end = text_end?;
    let link_text = &rest[1..text_end];
    // Must be immediately followed by (
    let after_bracket = &rest[text_end + 1..];
    if !after_bracket.starts_with('(') {
        return None;
    }
    let url_start = text_end + 1; // index of the '('
    let url_end = find_closing_paren(rest, url_start)?;
    let href = &rest[url_start + 1..url_end];

    Some((i + url_end + 1, link_text, href))
}

// ── ADF → Markdown ──────────────────────────────────────────────────

/// Options for ADF-to-markdown rendering.
#[derive(Debug, Clone, Default)]
pub struct RenderOptions {
    /// When true, omit `localId` attributes from directive output.
    pub strip_local_ids: bool,
}

/// Converts an ADF document to a markdown string.
pub fn adf_to_markdown(doc: &AdfDocument) -> Result<String> {
    adf_to_markdown_with_options(doc, &RenderOptions::default())
}

/// Converts an ADF document to a markdown string with options.
pub fn adf_to_markdown_with_options(doc: &AdfDocument, opts: &RenderOptions) -> Result<String> {
    let mut output = String::new();
    render_block_children(&doc.content, &mut output, opts);
    Ok(output)
}

/// Flattens an ADF document to plain text by concatenating all `text` nodes.
///
/// Block boundaries (paragraph, heading, list item, table cell, etc.) are
/// separated by a single space so a multi-paragraph anchor selection matches
/// when the user copies the text without trailing/leading whitespace.
///
/// Used by [`crate::atlassian::confluence_api::ConfluenceApi::resolve_anchor`]
/// to count occurrences of an inline-comment anchor on the live page body.
#[must_use]
pub fn adf_to_plain_text(doc: &AdfDocument) -> String {
    let mut out = String::new();
    for node in &doc.content {
        collect_plain_text(node, &mut out);
        if !out.is_empty() && !out.ends_with(' ') {
            out.push(' ');
        }
    }
    out.truncate(out.trim_end().len());
    out
}

fn collect_plain_text(node: &AdfNode, out: &mut String) {
    if let Some(text) = &node.text {
        out.push_str(text);
    }
    if let Some(children) = &node.content {
        for child in children {
            collect_plain_text(child, out);
        }
    }
}

/// Pushes a `localId=<value>` entry to an attribute parts vec,
/// unless `opts.strip_local_ids` is set or the value is a placeholder.
/// Copies `localId` from parsed directive attrs to an ADF node's attrs if present.
fn pass_through_local_id(dir_attrs: &Option<crate::atlassian::attrs::Attrs>, node: &mut AdfNode) {
    if let Some(ref attrs) = dir_attrs {
        if let Some(local_id) = attrs.get("localId") {
            if let Some(ref mut node_attrs) = node.attrs {
                node_attrs["localId"] = serde_json::Value::String(local_id.to_string());
            } else {
                node.attrs = Some(serde_json::json!({"localId": local_id}));
            }
        }
    }
}

/// Copies `localId` from directive attrs to the node's top-level `local_id` field,
/// and parses `params` JSON from directive attrs into the node's `parameters` field.
fn pass_through_expand_params(
    dir_attrs: &Option<crate::atlassian::attrs::Attrs>,
    node: &mut AdfNode,
) {
    if let Some(ref attrs) = dir_attrs {
        if let Some(local_id) = attrs.get("localId") {
            node.local_id = Some(local_id.to_string());
        }
        if let Some(params_str) = attrs.get("params") {
            if let Ok(params) = serde_json::from_str(params_str) {
                node.parameters = Some(params);
            }
        }
    }
}

// listItem localId is emitted as trailing inline attrs on the item line
// (e.g., `- item text {localId=...}`) and parsed back by extracting
// trailing attrs from the list item text. This avoids the block-attrs
// promotion issue where {localId=...} on a separate line would be
// applied to the parent list node.

/// Extracts trailing `{localId=... paraLocalId=...}` from list item text.
/// Returns the text without the trailing attrs, the listItem localId, and
/// the paragraph localId if found.
fn extract_trailing_local_id(text: &str) -> (&str, Option<String>, Option<String>) {
    let trimmed = text.trim_end();
    if !trimmed.ends_with('}') {
        return (text, None, None);
    }
    // Find the opening brace.  Only match a standalone `{…}` block that is
    // preceded by whitespace (or is at the start of the string).  A `{` that
    // immediately follows `]` is part of an inline directive (e.g.
    // `:mention[text]{id=… localId=…}`) and must NOT be consumed here.
    if let Some(brace_pos) = trimmed.rfind('{') {
        if brace_pos > 0 && !trimmed.as_bytes()[brace_pos - 1].is_ascii_whitespace() {
            return (text, None, None);
        }
        let attr_str = &trimmed[brace_pos..];
        if let Some((_, attrs)) = parse_attrs(attr_str, 0) {
            let local_id = attrs.get("localId").map(str::to_string);
            let para_local_id = attrs.get("paraLocalId").map(str::to_string);
            if local_id.is_some() || para_local_id.is_some() {
                let before = trimmed[..brace_pos]
                    .strip_suffix(' ')
                    .unwrap_or(&trimmed[..brace_pos]);
                return (before, local_id, para_local_id);
            }
        }
    }
    (text, None, None)
}

/// Creates a `listItem` node, optionally with a `localId` attribute
/// and a `paraLocalId` on its first paragraph child.
/// Parses the first line of a list item and any indented sub-content into
/// an `AdfNode::list_item`.  When the first line is a code fence opener
/// (`` ``` ``), the line is folded into the sub-content so the block-level
/// code fence parser handles it correctly (issue #511).
///
/// `depth` is the nesting depth for parsers spawned on the sub-content —
/// callers pass their own depth plus one.
fn parse_list_item_first_line(
    item_text: &str,
    sub_lines: Vec<String>,
    local_id: Option<String>,
    para_local_id: Option<String>,
    depth: usize,
) -> Result<AdfNode> {
    if item_text.starts_with("```") {
        // Treat the code fence opener + indented body as block content.
        let mut all_lines = vec![item_text.to_string()];
        all_lines.extend(sub_lines);
        let combined = all_lines.join("\n");
        let nested = MarkdownParser::with_depth(&combined, depth).parse_blocks()?;
        Ok(list_item_with_local_id(nested, local_id, para_local_id))
    } else if let Some(media) = try_parse_media_single_from_line(item_text) {
        // Block-level image (issue #430).
        if sub_lines.is_empty() {
            Ok(list_item_with_local_id(
                vec![media],
                local_id,
                para_local_id,
            ))
        } else {
            let sub_text = sub_lines.join("\n");
            let mut nested = MarkdownParser::with_depth(&sub_text, depth).parse_blocks()?;
            let mut content = vec![media];
            content.append(&mut nested);
            Ok(list_item_with_local_id(content, local_id, para_local_id))
        }
    } else {
        let first_node = AdfNode::paragraph(parse_inline(item_text));
        if sub_lines.is_empty() {
            Ok(list_item_with_local_id(
                vec![first_node],
                local_id,
                para_local_id,
            ))
        } else {
            let sub_text = sub_lines.join("\n");
            let mut nested = MarkdownParser::with_depth(&sub_text, depth).parse_blocks()?;
            let mut content = vec![first_node];
            content.append(&mut nested);
            Ok(list_item_with_local_id(content, local_id, para_local_id))
        }
    }
}

fn list_item_with_local_id(
    mut content: Vec<AdfNode>,
    local_id: Option<String>,
    para_local_id: Option<String>,
) -> AdfNode {
    if let Some(id) = &para_local_id {
        if let Some(first) = content.first_mut() {
            if first.node_type == "paragraph" {
                let node_attrs = first.attrs.get_or_insert_with(|| serde_json::json!({}));
                node_attrs["localId"] = serde_json::Value::String(id.clone());
            }
        }
    }
    let mut item = AdfNode::list_item(content);
    if let Some(id) = local_id {
        item.attrs = Some(serde_json::json!({"localId": id}));
    }
    item
}

fn maybe_push_local_id(attrs: &serde_json::Value, parts: &mut Vec<String>, opts: &RenderOptions) {
    if opts.strip_local_ids {
        return;
    }
    if let Some(local_id) = attrs.get("localId").and_then(serde_json::Value::as_str) {
        if !local_id.is_empty() && local_id != "00000000-0000-0000-0000-000000000000" {
            parts.push(format_kv("localId", local_id));
        }
    }
}

/// Returns `true` when `node` must be rendered with a trailing
/// `{list=separate}` marker because the very next sibling is a list the
/// parser's list loop would otherwise swallow as more items of `node`
/// (issue #1729).
///
/// The marker goes on the list that *ends*, not the one that starts, because
/// the mechanism is that a trailing attrs line terminates the list loop.
///
/// It mirrors the parser's fusing rule exactly, so nothing is emitted that
/// would make no difference:
///
/// * a bullet or task list followed by a bullet or task list — one
///   `parse_bullet_list` call runs them together (and would flip a
///   `bulletList` to a `taskList`, producing invalid ADF);
/// * an ordered list followed by an ordered list whose start continues the
///   numbering or restarts at `1.`  A restart at any other number is already
///   read as a second list, so it needs no marker.
///
/// A list that renders no items at all needs no marker either — there is
/// nothing to fuse, and the bare attrs line would only be re-read as a
/// paragraph.
fn needs_list_separator(node: &AdfNode, next: Option<&AdfNode>) -> bool {
    if !is_list_node_type(&node.node_type) || list_item_count(node) == 0 {
        return false;
    }
    let Some(next) = next else {
        return false;
    };
    if list_item_count(next) == 0 {
        return false;
    }
    match (node.node_type.as_str(), next.node_type.as_str()) {
        ("bulletList" | "taskList", "bulletList" | "taskList") => true,
        ("orderedList", "orderedList") => {
            let start = ordered_list_start(node);
            let len = u32::try_from(list_item_count(node)).unwrap_or(u32::MAX);
            let next_start = ordered_list_start(next);
            next_start == start.saturating_add(len) || next_start == 1
        }
        _ => false,
    }
}

/// Renders a sequence of block nodes with blank-line separators between them.
fn render_block_children(children: &[AdfNode], output: &mut String, opts: &RenderOptions) {
    for (i, child) in children.iter().enumerate() {
        if i > 0 {
            output.push('\n');
        }
        let separate = needs_list_separator(child, children.get(i + 1));
        render_block_node_separated(child, output, opts, separate);
    }
}

/// Formats a float as an integer string when it has no fractional part,
/// otherwise as a regular float string.
fn fmt_f64_attr(v: f64) -> String {
    if v.fract() == 0.0 {
        format!("{}", v as i64)
    } else {
        v.to_string()
    }
}

/// Parses a numeric attribute value string into a JSON number value that
/// preserves the original integer/float distinction. Returns `None` if the
/// string cannot be parsed as a number.
///
/// Strings without a `.` or exponent are parsed as integers (so `"800"` stays
/// `800`, not `800.0`); strings with a decimal point are parsed as floats.
fn parse_numeric_attr(s: &str) -> Option<serde_json::Value> {
    if s.contains('.') || s.contains('e') || s.contains('E') {
        s.parse::<f64>().ok().map(serde_json::Value::from)
    } else {
        s.parse::<i64>().ok().map(serde_json::Value::from)
    }
}

/// Formats a JSON numeric value as a markdown attribute string, preserving
/// whether the source was stored as an integer or a float.
///
/// Returns `None` if `v` is not a number. Integer values emit as `800`;
/// floating-point values emit as `800.0` (or `66.66` for non-integer floats),
/// so that a subsequent [`parse_numeric_attr`] round-trip recovers the same
/// JSON type.
fn fmt_numeric_attr(v: &serde_json::Value) -> Option<String> {
    if let Some(n) = v.as_i64() {
        return Some(n.to_string());
    }
    if let Some(n) = v.as_u64() {
        return Some(n.to_string());
    }
    if let Some(n) = v.as_f64() {
        if n.fract() == 0.0 && n.is_finite() {
            return Some(format!("{n:.1}"));
        }
        return Some(n.to_string());
    }
    None
}

/// Returns `true` when a paragraph's rendered inline content must be emitted
/// as `::paragraph[…]{attrs}` rather than as a plain line.
///
/// Two cases need it:
///
/// * whitespace-only content (e.g. a lone NBSP), which a plain line loses;
/// * content whose first character is a space or tab.  A plain line would
///   drop the indent — and after a list it is worse than lossy, because the
///   parser reads an indented line as the preceding item's own sub-content
///   and pulls the paragraph into the list (`"  # nope"` even becomes a
///   heading inside the item).
///
/// The directive is a single-line form, so a paragraph containing hardBreaks
/// cannot use it and keeps the plain rendering.
fn paragraph_needs_directive_form(buf: &str) -> bool {
    if buf.trim().is_empty() {
        return !buf.is_empty();
    }
    buf.starts_with([' ', '\t']) && !buf.contains('\n')
}

/// Renders a block-level ADF node to markdown.
fn render_block_node(node: &AdfNode, output: &mut String, opts: &RenderOptions) {
    render_block_node_separated(node, output, opts, false);
}

/// Renders a block-level ADF node to markdown, optionally tagging it with the
/// `{list=separate}` marker.
///
/// `separate_from_next` is computed by the sibling-rendering loops from
/// [`needs_list_separator`].  The marker is emitted through the same
/// trailing-attrs line as `{order=1}` / `{localId=…}`, so they compose onto
/// one line (`{order=1 list=separate}`) and so that a nested list's marker is
/// indented with the list it belongs to.
fn render_block_node_separated(
    node: &AdfNode,
    output: &mut String,
    opts: &RenderOptions,
    separate_from_next: bool,
) {
    match node.node_type.as_str() {
        "paragraph" => {
            let is_empty = node.content.as_ref().is_none_or(Vec::is_empty);
            // Build directive attr string for localId when using ::paragraph form
            let dir_attrs = {
                let mut parts = Vec::new();
                if let Some(ref attrs) = node.attrs {
                    maybe_push_local_id(attrs, &mut parts, opts);
                }
                if parts.is_empty() {
                    String::new()
                } else {
                    format!("{{{}}}", parts.join(" "))
                }
            };
            if is_empty {
                output.push_str(&format!("::paragraph{dir_attrs}\n"));
            } else {
                // Render to a buffer first to check if content is whitespace-only
                let mut buf = String::new();
                render_inline_content(node, &mut buf, opts);
                if paragraph_needs_directive_form(&buf) {
                    output.push_str(&format!("::paragraph[{buf}]{dir_attrs}\n"));
                } else {
                    // Escape a leading list-marker pattern so paragraph
                    // text is not re-parsed as a list item (issue #402).
                    // Indent continuation lines produced by hardBreaks so
                    // they are not re-parsed as list items (issue #455).
                    let mut is_first_line = true;
                    for line in buf.split('\n') {
                        if is_first_line {
                            if is_list_start(line) {
                                output.push_str(&escape_list_marker(line));
                            } else {
                                output.push_str(line);
                            }
                            is_first_line = false;
                        } else {
                            output.push('\n');
                            if !line.is_empty() {
                                output.push_str("  ");
                            }
                            output.push_str(line);
                        }
                    }
                    output.push('\n');
                }
            }
        }
        "heading" => {
            let level = node
                .attrs
                .as_ref()
                .and_then(|a| a.get("level"))
                .and_then(serde_json::Value::as_u64)
                .unwrap_or(1);
            for _ in 0..level {
                output.push('#');
            }
            output.push(' ');
            let mut buf = String::new();
            render_inline_content(node, &mut buf, opts);
            // Indent continuation lines produced by hardBreaks so they stay
            // within the heading when re-parsed (issue #433).
            let mut is_first_line = true;
            for line in buf.split('\n') {
                if is_first_line {
                    output.push_str(line);
                    is_first_line = false;
                } else {
                    output.push('\n');
                    if !line.is_empty() {
                        output.push_str("  ");
                    }
                    output.push_str(line);
                }
            }
            output.push('\n');
        }
        "codeBlock" => {
            let language_value = node.attrs.as_ref().and_then(|a| a.get("language"));
            let language = language_value
                .and_then(serde_json::Value::as_str)
                .unwrap_or("");
            output.push_str("```");
            if language.is_empty() && language_value.is_some() {
                // Explicit empty language attr: encode as ```"" to distinguish
                // from a codeBlock with no attrs at all (plain ```).
                output.push_str("\"\"");
            } else {
                output.push_str(language);
            }
            output.push('\n');
            if let Some(ref content) = node.content {
                for child in content {
                    if let Some(ref text) = child.text {
                        output.push_str(text);
                    }
                }
            }
            output.push_str("\n```\n");
        }
        "blockquote" => {
            if let Some(ref content) = node.content {
                for (i, child) in content.iter().enumerate() {
                    // Separate consecutive paragraph siblings with a blank
                    // blockquote-prefixed line so they re-parse as distinct
                    // paragraphs rather than being merged into one (issue #531).
                    if i > 0
                        && child.node_type == "paragraph"
                        && content[i - 1].node_type == "paragraph"
                    {
                        output.push_str(">\n");
                    }
                    let mut inner = String::new();
                    let separate = needs_list_separator(child, content.get(i + 1));
                    render_block_node_separated(child, &mut inner, opts, separate);
                    for line in inner.lines() {
                        output.push_str("> ");
                        output.push_str(line);
                        output.push('\n');
                    }
                }
            }
        }
        "bulletList" => {
            if let Some(ref items) = node.content {
                for item in items {
                    output.push_str("- ");
                    let content_start = output.len();
                    render_list_item_content(item, output, opts);
                    // If the rendered content begins with a sequence the
                    // bullet-list parser would interpret as a task checkbox
                    // marker, escape the leading `[` so the round-trip
                    // preserves this as a `bulletList` rather than promoting
                    // it to a `taskList` (issue #548).
                    if starts_with_task_marker(&output[content_start..]) {
                        output.insert(content_start, '\\');
                    }
                }
            }
        }
        "orderedList" => {
            let start = u64::from(ordered_list_start(node));
            if let Some(ref items) = node.content {
                for (i, item) in items.iter().enumerate() {
                    let num = start + i as u64;
                    output.push_str(&format!("{num}. "));
                    render_list_item_content(item, output, opts);
                }
            }
        }
        "taskList" => {
            if let Some(ref items) = node.content {
                for item in items {
                    if item.node_type == "taskList" {
                        // A nested taskList is a sibling child of the outer
                        // taskList — render it indented so it round-trips back
                        // as a taskList, not a taskItem (issue #506).
                        let mut nested = String::new();
                        render_block_node(item, &mut nested, opts);
                        for line in nested.lines() {
                            output.push_str("  ");
                            output.push_str(line);
                            output.push('\n');
                        }
                    } else {
                        let state = item
                            .attrs
                            .as_ref()
                            .and_then(|a| a.get("state"))
                            .and_then(serde_json::Value::as_str)
                            .unwrap_or("TODO");
                        if state == "DONE" {
                            output.push_str("- [x] ");
                        } else {
                            output.push_str("- [ ] ");
                        }
                        render_list_item_content(item, output, opts);
                    }
                }
            }
        }
        "rule" => {
            output.push_str("---\n");
        }
        "table" => {
            render_table(node, output, opts);
        }
        "mediaSingle" => {
            if let Some(ref content) = node.content {
                for child in content {
                    if child.node_type == "media" {
                        render_media(child, node.attrs.as_ref(), output, opts);
                    }
                }
                for child in content {
                    if child.node_type == "caption" {
                        let mut cap_parts = Vec::new();
                        if let Some(ref attrs) = child.attrs {
                            maybe_push_local_id(attrs, &mut cap_parts, opts);
                        }
                        if cap_parts.is_empty() {
                            output.push_str(":::caption\n");
                        } else {
                            output.push_str(&format!(":::caption{{{}}}\n", cap_parts.join(" ")));
                        }
                        if let Some(ref caption_content) = child.content {
                            for inline in caption_content {
                                render_inline_node(inline, output, opts);
                            }
                            output.push('\n');
                        }
                        output.push_str(":::\n");
                    }
                }
            }
        }
        "blockCard" => {
            if let Some(ref attrs) = node.attrs {
                let url = attrs
                    .get("url")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("");
                let mut attr_parts = Vec::new();
                if url_safe_in_bracket_content(url) {
                    output.push_str(&format!("::card[{url}]"));
                } else {
                    // URL would break `::card[URL]` parsing; use quoted attr form.
                    output.push_str("::card[]");
                    let escaped = url.replace('\\', "\\\\").replace('"', "\\\"");
                    attr_parts.push(format!("url=\"{escaped}\""));
                }
                if let Some(layout) = attrs.get("layout").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format!("layout={layout}"));
                }
                if let Some(width) = attrs.get("width").and_then(serde_json::Value::as_u64) {
                    attr_parts.push(format!("width={width}"));
                }
                if !attr_parts.is_empty() {
                    output.push_str(&format!("{{{}}}", attr_parts.join(" ")));
                }
                output.push('\n');
            }
        }
        "embedCard" => {
            if let Some(ref attrs) = node.attrs {
                let url = attrs
                    .get("url")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("");
                output.push_str(&format!("::embed[{url}]"));
                let mut attr_parts = Vec::new();
                if let Some(layout) = attrs.get("layout").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format!("layout={layout}"));
                }
                if let Some(h) = attrs
                    .get("originalHeight")
                    .and_then(serde_json::Value::as_f64)
                {
                    attr_parts.push(format!("originalHeight={}", fmt_f64_attr(h)));
                }
                if let Some(w) = attrs.get("width").and_then(serde_json::Value::as_f64) {
                    attr_parts.push(format!("width={}", fmt_f64_attr(w)));
                }
                if !attr_parts.is_empty() {
                    output.push_str(&format!("{{{}}}", attr_parts.join(" ")));
                }
                output.push('\n');
            }
        }
        "extension" => {
            if let Some(ref attrs) = node.attrs {
                let ext_type = attrs
                    .get("extensionType")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("");
                let ext_key = attrs
                    .get("extensionKey")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("");
                let mut attr_parts = vec![format!("type={ext_type}"), format!("key={ext_key}")];
                if let Some(layout) = attrs.get("layout").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format!("layout={layout}"));
                }
                if let Some(params) = attrs.get("parameters") {
                    if let Ok(json_str) = serde_json::to_string(params) {
                        attr_parts.push(format!("params='{json_str}'"));
                    }
                }
                maybe_push_local_id(attrs, &mut attr_parts, opts);
                output.push_str(&format!("::extension{{{}}}\n", attr_parts.join(" ")));
            }
        }
        "panel" => {
            let panel_type = node
                .attrs
                .as_ref()
                .and_then(|a| a.get("panelType"))
                .and_then(serde_json::Value::as_str)
                .unwrap_or("info");
            let mut attr_parts = vec![format!("type={panel_type}")];
            if let Some(ref attrs) = node.attrs {
                if let Some(icon) = attrs.get("panelIcon").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format!("icon=\"{icon}\""));
                }
                if let Some(color) = attrs.get("panelColor").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format!("color=\"{color}\""));
                }
            }
            output.push_str(&format!(":::panel{{{}}}\n", attr_parts.join(" ")));
            if let Some(ref content) = node.content {
                render_block_children(content, output, opts);
            }
            output.push_str(":::\n");
        }
        "expand" | "nestedExpand" => {
            let directive_name = if node.node_type == "nestedExpand" {
                "nested-expand"
            } else {
                "expand"
            };
            let mut attr_parts = Vec::new();
            if let Some(t) = node
                .attrs
                .as_ref()
                .and_then(|a| a.get("title"))
                .and_then(serde_json::Value::as_str)
            {
                attr_parts.push(format!("title=\"{t}\""));
            }
            // Check top-level localId first, then fall back to attrs.localId
            if let Some(ref lid) = node.local_id {
                if !opts.strip_local_ids && lid != "00000000-0000-0000-0000-000000000000" {
                    attr_parts.push(format!("localId={lid}"));
                }
            } else if let Some(ref attrs) = node.attrs {
                maybe_push_local_id(attrs, &mut attr_parts, opts);
            }
            // Emit top-level parameters as params='...'
            if let Some(ref params) = node.parameters {
                if let Ok(json_str) = serde_json::to_string(params) {
                    attr_parts.push(format!("params='{json_str}'"));
                }
            }
            if attr_parts.is_empty() {
                output.push_str(&format!(":::{directive_name}\n"));
            } else {
                output.push_str(&format!(
                    ":::{directive_name}{{{}}}\n",
                    attr_parts.join(" ")
                ));
            }
            if let Some(ref content) = node.content {
                render_block_children(content, output, opts);
            }
            output.push_str(":::\n");
        }
        "layoutSection" => {
            output.push_str("::::layout\n");
            if let Some(ref content) = node.content {
                for child in content {
                    if child.node_type == "layoutColumn" {
                        let width_str = child
                            .attrs
                            .as_ref()
                            .and_then(|a| a.get("width"))
                            .and_then(fmt_numeric_attr)
                            .unwrap_or_else(|| "50".to_string());
                        let mut parts = vec![format!("width={width_str}")];
                        if let Some(ref attrs) = child.attrs {
                            maybe_push_local_id(attrs, &mut parts, opts);
                        }
                        output.push_str(&format!(":::column{{{}}}\n", parts.join(" ")));
                        if let Some(ref col_content) = child.content {
                            render_block_children(col_content, output, opts);
                        }
                        output.push_str(":::\n");
                    }
                }
            }
            output.push_str("::::\n");
        }
        "decisionList" => {
            output.push_str(":::decisions\n");
            if let Some(ref content) = node.content {
                for item in content {
                    output.push_str("- <> ");
                    render_list_item_content(item, output, opts);
                }
            }
            output.push_str(":::\n");
        }
        "bodiedExtension" => {
            if let Some(ref attrs) = node.attrs {
                let ext_type = attrs
                    .get("extensionType")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("");
                let ext_key = attrs
                    .get("extensionKey")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("");
                let mut attr_parts = vec![format!("type={ext_type}"), format!("key={ext_key}")];
                if let Some(layout) = attrs.get("layout").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format!("layout={layout}"));
                }
                if let Some(params) = attrs.get("parameters") {
                    if let Ok(json_str) = serde_json::to_string(params) {
                        attr_parts.push(format!("params='{json_str}'"));
                    }
                }
                maybe_push_local_id(attrs, &mut attr_parts, opts);
                output.push_str(&format!(":::extension{{{}}}\n", attr_parts.join(" ")));
                if let Some(ref content) = node.content {
                    render_block_children(content, output, opts);
                }
                output.push_str(":::\n");
            }
        }
        _ => {
            // Preserve unsupported nodes as JSON in adf-unsupported code blocks
            if let Ok(json) = serde_json::to_string_pretty(node) {
                output.push_str("```adf-unsupported\n");
                output.push_str(&json);
                output.push_str("\n```\n");
            }
        }
    }

    // Emit block-level attribute marks (align, indent, breakout) and localId
    let mut parts = Vec::new();
    if let Some(ref marks) = node.marks {
        for mark in marks {
            match mark.mark_type.as_str() {
                "alignment" => {
                    if let Some(align) = mark
                        .attrs
                        .as_ref()
                        .and_then(|a| a.get("align"))
                        .and_then(serde_json::Value::as_str)
                    {
                        parts.push(format!("align={align}"));
                    }
                }
                "indentation" => {
                    if let Some(level) = mark
                        .attrs
                        .as_ref()
                        .and_then(|a| a.get("level"))
                        .and_then(serde_json::Value::as_u64)
                    {
                        parts.push(format!("indent={level}"));
                    }
                }
                "breakout" => {
                    if let Some(mode) = mark
                        .attrs
                        .as_ref()
                        .and_then(|a| a.get("mode"))
                        .and_then(serde_json::Value::as_str)
                    {
                        parts.push(format!("breakout={mode}"));
                    }
                    if let Some(width) = mark
                        .attrs
                        .as_ref()
                        .and_then(|a| a.get("width"))
                        .and_then(serde_json::Value::as_u64)
                    {
                        parts.push(format!("breakoutWidth={width}"));
                    }
                }
                _ => {}
            }
        }
    }
    // Skip localId for node types that already include it in their directive attrs.
    // For paragraphs, localId is included in the ::paragraph directive when the
    // paragraph uses directive form (empty or whitespace-only content).
    let para_used_directive = node.node_type == "paragraph" && {
        let is_empty = node.content.as_ref().is_none_or(Vec::is_empty);
        if is_empty {
            true
        } else {
            let mut buf = String::new();
            render_inline_content(node, &mut buf, opts);
            paragraph_needs_directive_form(&buf)
        }
    };
    if !matches!(node.node_type.as_str(), "expand" | "nestedExpand") && !para_used_directive {
        if let Some(ref attrs) = node.attrs {
            maybe_push_local_id(attrs, &mut parts, opts);
        }
    }
    // orderedList with explicit `attrs.order=1` needs a trailing `{order=1}`
    // signal so the round-trip can distinguish explicit default from omitted
    // attrs (issue #547). Values other than 1 are already encoded by the
    // list marker, so no signal is needed.
    if node.node_type == "orderedList" {
        if let Some(ref attrs) = node.attrs {
            if attrs.get("order").and_then(serde_json::Value::as_u64) == Some(1) {
                parts.push("order=1".to_string());
            }
        }
    }
    // A blank line between two lists is also what a CommonMark loose list
    // looks like, so the parser would read the next one as more items of this
    // one.  This marker ends the list: any trailing attrs line does, and the
    // key is recognised only so the line is not re-read as a paragraph
    // (issue #1729).
    if separate_from_next && is_list_node_type(&node.node_type) {
        parts.push(format_kv(LIST_SEPARATE_ATTR, "separate"));
    }
    if !parts.is_empty() {
        output.push_str(&format!("{{{}}}\n", parts.join(" ")));
    }
}

/// Renders the content of a list item (unwraps the paragraph layer).
/// Nested block children (e.g. sub-lists) are indented with two spaces.
///
/// Some ADF producers (e.g. Confluence) emit `taskItem` content without a
/// paragraph wrapper — the inline nodes sit directly inside the item.  We
/// detect this by checking whether the first child is an inline node type
/// and, if so, render *all* leading inline children on the first line.
fn render_list_item_content(item: &AdfNode, output: &mut String, opts: &RenderOptions) {
    let Some(ref content) = item.content else {
        // Still emit localId and newline for items with no content (e.g. empty taskItem).
        let bare = AdfNode::text("");
        emit_list_item_local_ids(item, &bare, output, opts);
        output.push('\n');
        return;
    };
    if content.is_empty() {
        let bare = AdfNode::text("");
        emit_list_item_local_ids(item, &bare, output, opts);
        output.push('\n');
        return;
    }
    let first = &content[0];
    let rest_start;
    if first.node_type == "paragraph" {
        let mut buf = String::new();
        render_inline_content(first, &mut buf, opts);
        // A trailing hardBreak produces a trailing `\\\n` in the buffer.
        // Strip the final newline so it doesn't create a blank line after
        // the list item marker, which would split the list on re-parse
        // (issue #472).  The `\` is kept so round-trip preserves the
        // hardBreak, and `output.push('\n')` below supplies the terminator.
        let buf = buf.trim_end_matches('\n');
        // Indent continuation lines produced by hardBreaks so they stay
        // within the list item when re-parsed (issue #402).
        let mut is_first_line = true;
        for line in buf.split('\n') {
            if is_first_line {
                output.push_str(line);
                is_first_line = false;
            } else {
                output.push('\n');
                if !line.is_empty() {
                    output.push_str("  ");
                }
                output.push_str(line);
            }
        }
        // Emit paragraph + listItem localIds as trailing inline attrs on the first line
        emit_list_item_local_ids(item, first, output, opts);
        output.push('\n');
        rest_start = 1;
    } else if is_inline_node_type(&first.node_type) {
        // Inline nodes without a paragraph wrapper — render them directly.
        rest_start = content
            .iter()
            .position(|c| !is_inline_node_type(&c.node_type))
            .unwrap_or(content.len());
        let mut buf = String::new();
        for child in &content[..rest_start] {
            render_inline_node(child, &mut buf, opts);
        }
        // Indent continuation lines produced by hardBreaks so they stay
        // within the list item when re-parsed (issue #521).
        let buf = buf.trim_end_matches('\n');
        let mut is_first_line = true;
        for line in buf.split('\n') {
            if is_first_line {
                output.push_str(line);
                is_first_line = false;
            } else {
                output.push('\n');
                if !line.is_empty() {
                    output.push_str("  ");
                }
                output.push_str(line);
            }
        }
        // No paragraph wrapper — pass a bare node so paraLocalId is omitted.
        let bare = AdfNode::text("");
        emit_list_item_local_ids(item, &bare, output, opts);
        output.push('\n');
        // Any remaining children are block nodes — fall through to the
        // indented-block loop below.
    } else if first.node_type == "taskItem" {
        // Malformed ADF: taskItem.content contains nested taskItem nodes
        // directly (seen in some Confluence pages).  Render them as an
        // indented nested task list to preserve the data without
        // corrupting the surrounding structure (issue #489).
        let bare = AdfNode::text("");
        emit_list_item_local_ids(item, &bare, output, opts);
        output.push('\n');
        for (i, child) in content.iter().enumerate() {
            if child.node_type == "taskItem" {
                let state = child
                    .attrs
                    .as_ref()
                    .and_then(|a| a.get("state"))
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("TODO");
                let marker = if state == "DONE" { "- [x] " } else { "- [ ] " };
                output.push_str("  ");
                output.push_str(marker);
                render_list_item_content(child, output, opts);
            } else {
                let mut nested = String::new();
                let separate = needs_list_separator(child, content.get(i + 1));
                render_block_node_separated(child, &mut nested, opts, separate);
                for line in nested.lines() {
                    output.push_str("  ");
                    output.push_str(line);
                    output.push('\n');
                }
            }
        }
        return;
    } else {
        // Block-level first child (e.g. codeBlock, mediaSingle).
        // Render to a buffer so we can:
        //  1. Append listItem localId attrs to the first line (issue #525)
        //  2. Indent continuation lines so multi-line blocks stay inside
        //     the list item (issue #511)
        let mut buf = String::new();
        // A block-level first child can itself be a list that the next
        // sibling would fuse with (issue #1729).
        let separate = needs_list_separator(first, content.get(1));
        render_block_node_separated(first, &mut buf, opts, separate);
        let bare = AdfNode::text("");
        let mut is_first = true;
        for line in buf.lines() {
            if is_first {
                output.push_str(line);
                emit_list_item_local_ids(item, &bare, output, opts);
                output.push('\n');
                is_first = false;
            } else {
                output.push_str("  ");
                output.push_str(line);
                output.push('\n');
            }
        }
        rest_start = 1;
    }
    let rest = &content[rest_start..];
    for (i, child) in rest.iter().enumerate() {
        // Separate consecutive paragraph siblings with a blank indented
        // line so they re-parse as distinct paragraphs rather than being
        // merged into one (issue #522).  The previous sibling of `rest[0]`
        // is the node rendered on the item's first line (above).
        let prev = if i == 0 { first } else { &rest[i - 1] };
        if child.node_type == "paragraph" && prev.node_type == "paragraph" {
            output.push_str("  \n");
        }
        let separate = needs_list_separator(child, rest.get(i + 1));
        let mut nested = String::new();
        render_block_node_separated(child, &mut nested, opts, separate);
        for line in nested.lines() {
            output.push_str("  ");
            output.push_str(line);
            output.push('\n');
        }
    }
}

/// Returns `true` if the given ADF node type is an inline node.
fn is_inline_node_type(node_type: &str) -> bool {
    matches!(
        node_type,
        "text"
            | "hardBreak"
            | "inlineCard"
            | "emoji"
            | "mention"
            | "status"
            | "date"
            | "placeholder"
            | "mediaInline"
    )
}

/// Emits trailing `{localId=... paraLocalId=...}` on a list item line
/// for both the listItem and its first (unwrapped) paragraph.
fn emit_list_item_local_ids(
    item: &AdfNode,
    paragraph: &AdfNode,
    output: &mut String,
    opts: &RenderOptions,
) {
    if opts.strip_local_ids {
        return;
    }
    let mut parts = Vec::new();
    if let Some(ref attrs) = item.attrs {
        maybe_push_local_id(attrs, &mut parts, opts);
    }
    if paragraph.node_type == "paragraph" {
        let has_real_id = paragraph
            .attrs
            .as_ref()
            .and_then(|a| a.get("localId"))
            .and_then(serde_json::Value::as_str)
            .filter(|id| !id.is_empty() && *id != "00000000-0000-0000-0000-000000000000");
        if let Some(local_id) = has_real_id {
            parts.push(format!("paraLocalId={local_id}"));
        } else if item.node_type == "taskItem" {
            // taskItem content may or may not have a paragraph wrapper;
            // emit a sentinel so the round-trip can distinguish the two
            // forms and restore the wrapper (issue #478).
            parts.push("paraLocalId=_".to_string());
        }
    }
    if !parts.is_empty() {
        output.push_str(&format!(" {{{}}}", parts.join(" ")));
    }
}

/// Renders a table node, choosing between pipe table and directive table form.
fn render_table(node: &AdfNode, output: &mut String, opts: &RenderOptions) {
    let Some(ref rows) = node.content else {
        return;
    };

    if table_qualifies_for_pipe_syntax(rows) {
        render_pipe_table(node, rows, output, opts);
    } else {
        render_directive_table(node, rows, output, opts);
    }
}

/// Checks whether all cells qualify for GFM pipe table syntax:
/// - Every cell has exactly one paragraph child with only inline nodes
/// - All `tableHeader` nodes appear exclusively in the first row
/// - The first row must contain at least one `tableHeader` (pipe tables
///   always treat the first row as headers, so `tableCell`-only first rows
///   must use directive form to preserve the cell type)
fn table_qualifies_for_pipe_syntax(rows: &[AdfNode]) -> bool {
    // Tables with caption nodes must use directive form
    if rows.iter().any(|n| n.node_type == "caption") {
        return false;
    }
    let mut first_row_has_header = false;
    for (row_idx, row) in rows.iter().enumerate() {
        let Some(ref cells) = row.content else {
            continue;
        };
        for cell in cells {
            // Header cells outside first row → must use directive form
            if row_idx > 0 && cell.node_type == "tableHeader" {
                return false;
            }
            if row_idx == 0 && cell.node_type == "tableHeader" {
                first_row_has_header = true;
            }
            // Check cell has exactly one paragraph with only inline content
            let Some(ref content) = cell.content else {
                continue;
            };
            if content.len() != 1 || content[0].node_type != "paragraph" {
                return false;
            }
            // hardBreak inside a cell produces a newline that breaks pipe
            // table syntax — fall back to directive form
            if cell_contains_hard_break(&content[0]) {
                return false;
            }
            // Cell-level marks (e.g., border) cannot be represented in pipe
            // form — fall back to directive form
            if cell.marks.as_ref().is_some_and(|m| !m.is_empty()) {
                return false;
            }
            // Paragraph-level localId would be lost in pipe form (the paragraph
            // is unwrapped into the cell text) — fall back to directive form
            if content[0]
                .attrs
                .as_ref()
                .and_then(|a| a.get("localId"))
                .is_some()
            {
                return false;
            }
        }
    }
    // First row must have at least one tableHeader for pipe syntax;
    // otherwise the round-trip would convert tableCell → tableHeader.
    first_row_has_header
}

/// Returns true if a paragraph node contains any `hardBreak` inline nodes.
fn cell_contains_hard_break(paragraph: &AdfNode) -> bool {
    paragraph
        .content
        .as_ref()
        .is_some_and(|nodes| nodes.iter().any(|n| n.node_type == "hardBreak"))
}

/// Renders a table as GFM pipe syntax.
fn render_pipe_table(node: &AdfNode, rows: &[AdfNode], output: &mut String, opts: &RenderOptions) {
    for (row_idx, row) in rows.iter().enumerate() {
        let Some(ref cells) = row.content else {
            continue;
        };

        output.push('|');
        for cell in cells {
            output.push(' ');
            let mut cell_buf = String::new();
            render_cell_attrs_prefix(cell, &mut cell_buf);
            render_inline_content_from_first_paragraph(cell, &mut cell_buf, opts);
            output.push_str(&escape_pipes_in_cell(&cell_buf));
            output.push_str(" |");
        }
        output.push('\n');

        // Add separator after header row
        if row_idx == 0 {
            output.push('|');
            for cell in cells {
                let align = get_cell_paragraph_alignment(cell);
                match align {
                    Some("center") => output.push_str(" :---: |"),
                    Some("end") => output.push_str(" ---: |"),
                    _ => output.push_str(" --- |"),
                }
            }
            output.push('\n');
        }
    }

    // Emit table-level attrs if present
    render_table_level_attrs(node, output, opts);
}

/// Renders a table as `::::table` directive syntax (block-content cells).
fn render_directive_table(
    node: &AdfNode,
    rows: &[AdfNode],
    output: &mut String,
    opts: &RenderOptions,
) {
    // Opening fence with attrs
    let mut attr_parts = Vec::new();
    if let Some(ref attrs) = node.attrs {
        if let Some(layout) = attrs.get("layout").and_then(serde_json::Value::as_str) {
            attr_parts.push(format!("layout={layout}"));
        }
        if let Some(numbered) = attrs
            .get("isNumberColumnEnabled")
            .and_then(serde_json::Value::as_bool)
        {
            if numbered {
                attr_parts.push("numbered".to_string());
            } else {
                attr_parts.push("numbered=false".to_string());
            }
        }
        if let Some(tw) = attrs.get("width").and_then(serde_json::Value::as_f64) {
            let tw_str = if tw.fract() == 0.0 {
                (tw as u64).to_string()
            } else {
                tw.to_string()
            };
            attr_parts.push(format!("width={tw_str}"));
        }
        maybe_push_local_id(attrs, &mut attr_parts, opts);
    }
    if attr_parts.is_empty() {
        output.push_str("::::table\n");
    } else {
        output.push_str(&format!("::::table{{{}}}\n", attr_parts.join(" ")));
    }

    for row in rows {
        if row.node_type == "caption" {
            let mut cap_parts = Vec::new();
            if let Some(ref attrs) = row.attrs {
                maybe_push_local_id(attrs, &mut cap_parts, opts);
            }
            if cap_parts.is_empty() {
                output.push_str(":::caption\n");
            } else {
                output.push_str(&format!(":::caption{{{}}}\n", cap_parts.join(" ")));
            }
            if let Some(ref content) = row.content {
                for child in content {
                    render_inline_node(child, output, opts);
                }
                output.push('\n');
            }
            output.push_str(":::\n");
            continue;
        }
        let Some(ref cells) = row.content else {
            continue;
        };
        // Emit :::tr with optional localId
        let mut tr_attrs = Vec::new();
        if let Some(ref attrs) = row.attrs {
            maybe_push_local_id(attrs, &mut tr_attrs, opts);
        }
        if tr_attrs.is_empty() {
            output.push_str(":::tr\n");
        } else {
            output.push_str(&format!(":::tr{{{}}}\n", tr_attrs.join(" ")));
        }
        for cell in cells {
            let directive_name = if cell.node_type == "tableHeader" {
                "th"
            } else {
                "td"
            };
            let mut cell_attr_str = build_cell_attrs_string(cell);
            // Append localId to cell attrs if present
            if let Some(ref attrs) = cell.attrs {
                let mut lid_parts = Vec::new();
                maybe_push_local_id(attrs, &mut lid_parts, opts);
                if !lid_parts.is_empty() {
                    if !cell_attr_str.is_empty() {
                        cell_attr_str.push(' ');
                    }
                    cell_attr_str.push_str(&lid_parts.join(" "));
                }
            }
            // Append border mark attrs if present
            if let Some(ref marks) = cell.marks {
                for mark in marks {
                    if mark.mark_type == "border" {
                        if let Some(ref attrs) = mark.attrs {
                            if let Some(color) =
                                attrs.get("color").and_then(serde_json::Value::as_str)
                            {
                                if !cell_attr_str.is_empty() {
                                    cell_attr_str.push(' ');
                                }
                                cell_attr_str.push_str(&format!("border-color={color}"));
                            }
                            if let Some(size) =
                                attrs.get("size").and_then(serde_json::Value::as_u64)
                            {
                                if !cell_attr_str.is_empty() {
                                    cell_attr_str.push(' ');
                                }
                                cell_attr_str.push_str(&format!("border-size={size}"));
                            }
                        }
                    }
                }
            }
            let has_marks = cell.marks.as_ref().is_some_and(|m| !m.is_empty());
            if cell_attr_str.is_empty() && cell.attrs.is_none() && !has_marks {
                output.push_str(&format!(":::{directive_name}\n"));
            } else {
                output.push_str(&format!(":::{directive_name}{{{cell_attr_str}}}\n"));
            }
            if let Some(ref content) = cell.content {
                render_block_children(content, output, opts);
            }
            output.push_str(":::\n");
        }
        output.push_str(":::\n");
    }

    output.push_str("::::\n");
}

/// Returns `true` when an attribute value must be quoted to survive round-trip
/// through the `{key=value}` attribute parser (which stops unquoted values at
/// whitespace or `}`).
fn needs_attr_quoting(value: &str) -> bool {
    value.contains(|c: char| c.is_whitespace() || c == '}' || c == '(' || c == ')' || c == ',')
}

/// Builds a JFM attribute string from ADF cell attributes.
fn build_cell_attrs_string(cell: &AdfNode) -> String {
    let Some(ref attrs) = cell.attrs else {
        return String::new();
    };
    let mut parts = Vec::new();
    if let Some(colspan) = attrs.get("colspan").and_then(serde_json::Value::as_u64) {
        parts.push(format!("colspan={colspan}"));
    }
    if let Some(rowspan) = attrs.get("rowspan").and_then(serde_json::Value::as_u64) {
        parts.push(format!("rowspan={rowspan}"));
    }
    if let Some(bg) = attrs.get("background").and_then(serde_json::Value::as_str) {
        if needs_attr_quoting(bg) {
            let escaped = bg.replace('\\', "\\\\").replace('"', "\\\"");
            parts.push(format!("bg=\"{escaped}\""));
        } else {
            parts.push(format!("bg={bg}"));
        }
    }
    if let Some(colwidth) = attrs.get("colwidth").and_then(serde_json::Value::as_array) {
        let widths: Vec<String> = colwidth
            .iter()
            .filter_map(|v| {
                // Preserve the original number type: integers stay as integers,
                // floats stay as floats (e.g. Confluence's 254.0 representation).
                if let Some(n) = v.as_u64() {
                    Some(n.to_string())
                } else if let Some(n) = v.as_f64() {
                    if n.fract() == 0.0 {
                        format!("{n:.1}")
                    } else {
                        n.to_string()
                    }
                    .into()
                } else {
                    None
                }
            })
            .collect();
        if !widths.is_empty() {
            parts.push(format!("colwidth={}", widths.join(",")));
        }
    }
    parts.join(" ")
}

/// Renders `{attrs}` prefix for a pipe table cell (background, colspan, etc.).
fn render_cell_attrs_prefix(cell: &AdfNode, output: &mut String) {
    let Some(ref _attrs) = cell.attrs else {
        return;
    };
    let attr_str = build_cell_attrs_string(cell);
    if attr_str.is_empty() {
        output.push_str("{} ");
    } else {
        output.push_str(&format!("{{{attr_str}}} "));
    }
}

/// Gets the alignment mark value from the paragraph inside a table cell.
fn get_cell_paragraph_alignment(cell: &AdfNode) -> Option<&str> {
    let content = cell.content.as_ref()?;
    let para = content.first()?;
    let marks = para.marks.as_ref()?;
    marks.iter().find_map(|m| {
        if m.mark_type == "alignment" {
            m.attrs
                .as_ref()
                .and_then(|a| a.get("align"))
                .and_then(serde_json::Value::as_str)
        } else {
            None
        }
    })
}

/// Emits table-level attributes if present.
fn render_table_level_attrs(node: &AdfNode, output: &mut String, opts: &RenderOptions) {
    if let Some(ref attrs) = node.attrs {
        let mut parts = Vec::new();
        if let Some(layout) = attrs.get("layout").and_then(serde_json::Value::as_str) {
            parts.push(format!("layout={layout}"));
        }
        if let Some(numbered) = attrs
            .get("isNumberColumnEnabled")
            .and_then(serde_json::Value::as_bool)
        {
            if numbered {
                parts.push("numbered".to_string());
            } else {
                parts.push("numbered=false".to_string());
            }
        }
        if let Some(tw_str) = attrs.get("width").and_then(fmt_numeric_attr) {
            parts.push(format!("width={tw_str}"));
        }
        maybe_push_local_id(attrs, &mut parts, opts);
        if !parts.is_empty() {
            output.push_str(&format!("{{{}}}\n", parts.join(" ")));
        }
    }
}

/// Renders inline content from the first paragraph child of a table cell.
fn render_inline_content_from_first_paragraph(
    cell: &AdfNode,
    output: &mut String,
    opts: &RenderOptions,
) {
    if let Some(ref content) = cell.content {
        if let Some(first) = content.first() {
            if first.node_type == "paragraph" {
                render_inline_content(first, output, opts);
            }
        }
    }
}

/// Appends border mark attributes (border-color, border-size) to a parts vec.
fn push_border_mark_attrs(marks: &Option<Vec<AdfMark>>, parts: &mut Vec<String>) {
    if let Some(ref marks) = marks {
        for mark in marks {
            if mark.mark_type == "border" {
                if let Some(ref attrs) = mark.attrs {
                    if let Some(color) = attrs.get("color").and_then(serde_json::Value::as_str) {
                        parts.push(format!("border-color={color}"));
                    }
                    if let Some(size) = attrs.get("size").and_then(serde_json::Value::as_u64) {
                        parts.push(format!("border-size={size}"));
                    }
                }
            }
        }
    }
}

/// Renders a media node as a markdown image, with optional parent (mediaSingle) attrs.
fn render_media(
    node: &AdfNode,
    parent_attrs: Option<&serde_json::Value>,
    output: &mut String,
    opts: &RenderOptions,
) {
    if let Some(ref attrs) = node.attrs {
        let media_type = attrs
            .get("type")
            .and_then(serde_json::Value::as_str)
            .unwrap_or("external");
        let alt = attrs
            .get("alt")
            .and_then(serde_json::Value::as_str)
            .unwrap_or("");

        if media_type == "file" {
            // Confluence file attachment — encode metadata in {attrs} block so it survives round-trip
            output.push_str(&format!("![{alt}]()"));
            let mut parts = vec!["type=file".to_string()];
            if let Some(id) = attrs.get("id").and_then(serde_json::Value::as_str) {
                parts.push(format_kv("id", id));
            }
            if let Some(collection) = attrs.get("collection").and_then(serde_json::Value::as_str) {
                parts.push(format_kv("collection", collection));
            }
            if let Some(occurrence_key) = attrs
                .get("occurrenceKey")
                .and_then(serde_json::Value::as_str)
            {
                parts.push(format_kv("occurrenceKey", occurrence_key));
            }
            if let Some(height_str) = attrs.get("height").and_then(fmt_numeric_attr) {
                parts.push(format!("height={height_str}"));
            }
            if let Some(width_str) = attrs.get("width").and_then(fmt_numeric_attr) {
                parts.push(format!("width={width_str}"));
            }
            maybe_push_local_id(attrs, &mut parts, opts);
            // Encode mediaSingle layout/width/widthType if non-default
            if let Some(p_attrs) = parent_attrs {
                if let Some(layout) = p_attrs.get("layout").and_then(serde_json::Value::as_str) {
                    if layout != "center" {
                        parts.push(format!("layout={layout}"));
                    }
                }
                if let Some(ms_width_str) = p_attrs.get("width").and_then(fmt_numeric_attr) {
                    parts.push(format!("mediaWidth={ms_width_str}"));
                }
                if let Some(wt) = p_attrs.get("widthType").and_then(serde_json::Value::as_str) {
                    parts.push(format!("widthType={wt}"));
                }
                if let Some(mode) = p_attrs.get("mode").and_then(serde_json::Value::as_str) {
                    parts.push(format!("mode={mode}"));
                }
            }
            push_border_mark_attrs(&node.marks, &mut parts);
            output.push_str(&format!("{{{}}}", parts.join(" ")));
        } else {
            // External image
            let url = attrs
                .get("url")
                .and_then(serde_json::Value::as_str)
                .unwrap_or("");
            output.push_str(&format!("![{alt}]({url})"));

            // Emit {layout=... width=... widthType=... mode=... localId=...} if non-default attrs present
            {
                let mut parts = Vec::new();
                if let Some(p_attrs) = parent_attrs {
                    let layout = p_attrs.get("layout").and_then(serde_json::Value::as_str);
                    let width_str = p_attrs.get("width").and_then(fmt_numeric_attr);
                    let width_type = p_attrs.get("widthType").and_then(serde_json::Value::as_str);
                    if let Some(l) = layout {
                        if l != "center" {
                            parts.push(format!("layout={l}"));
                        }
                    }
                    if let Some(w) = width_str {
                        parts.push(format!("width={w}"));
                    }
                    if let Some(wt) = width_type {
                        parts.push(format!("widthType={wt}"));
                    }
                    if let Some(mode) = p_attrs.get("mode").and_then(serde_json::Value::as_str) {
                        parts.push(format!("mode={mode}"));
                    }
                }
                maybe_push_local_id(attrs, &mut parts, opts);
                push_border_mark_attrs(&node.marks, &mut parts);
                if !parts.is_empty() {
                    output.push_str(&format!("{{{}}}", parts.join(" ")));
                }
            }
        }

        output.push('\n');
    }
}

/// Renders inline content (text nodes with marks) from a block node's children.
fn render_inline_content(node: &AdfNode, output: &mut String, opts: &RenderOptions) {
    if let Some(ref content) = node.content {
        for child in content {
            render_inline_node(child, output, opts);
        }
    }
}

/// Renders a single inline ADF node to markdown.
fn render_inline_node(node: &AdfNode, output: &mut String, opts: &RenderOptions) {
    match node.node_type.as_str() {
        "text" => {
            let text = node.text.as_deref().unwrap_or("");
            let marks = node.marks.as_deref().unwrap_or(&[]);
            let has_code = marks.iter().any(|m| m.mark_type == "code");
            // Issue #477: Escape literal backslashes before the newline
            // encoding below so they are not consumed as JFM escape
            // sequences on round-trip.  Code marks emit content verbatim,
            // so backslash escaping is skipped for them.
            let owned;
            let text = if !has_code {
                owned = text.replace('\\', "\\\\");
                owned.as_str()
            } else {
                text
            };
            // Issue #454: A literal newline inside a text node is escaped
            // as the two-character sequence `\n` so it survives round-trip
            // as a single text node instead of splitting into paragraphs or
            // being converted to hardBreak nodes.
            let owned_nl;
            let text = if text.contains('\n') {
                owned_nl = text.replace('\n', "\\n");
                owned_nl.as_str()
            } else {
                text
            };
            // Issue #510: Two or more trailing spaces at the end of a text
            // node would be misinterpreted as a hardBreak marker on
            // round-trip (and collapse the following paragraph).  Escape the
            // last space with a backslash so the parser treats it as a
            // literal space instead of a line-break signal.
            let owned_ts;
            let text = if !has_code && text.ends_with("  ") {
                let mut s = text.to_string();
                // Insert backslash before the final space: "foo  " → "foo \ "
                s.insert(s.len() - 1, '\\');
                owned_ts = s;
                owned_ts.as_str()
            } else {
                text
            };
            render_marked_text(text, marks, output);
        }
        "hardBreak" => {
            output.push_str("\\\n");
        }
        other => {
            // Issue #471: Non-text inline nodes (emoji, status, date, mention, etc.)
            // may carry annotation marks. Render the node body first, then wrap it
            // in bracketed-span syntax if annotation marks are present.
            let mut body = String::new();
            render_non_text_inline_body(other, node, &mut body, opts);

            let annotations: Vec<&AdfMark> = node
                .marks
                .as_deref()
                .unwrap_or(&[])
                .iter()
                .filter(|m| m.mark_type == "annotation")
                .collect();

            if annotations.is_empty() {
                output.push_str(&body);
            } else {
                let mut attr_parts = Vec::new();
                for ann in &annotations {
                    if let Some(ref attrs) = ann.attrs {
                        if let Some(id) = attrs.get("id").and_then(serde_json::Value::as_str) {
                            let escaped = id.replace('\\', "\\\\").replace('"', "\\\"");
                            attr_parts.push(format!("annotation-id=\"{escaped}\""));
                        }
                        if let Some(at) = attrs
                            .get("annotationType")
                            .and_then(serde_json::Value::as_str)
                        {
                            attr_parts.push(format!("annotation-type={at}"));
                        }
                    }
                }
                output.push('[');
                output.push_str(&body);
                output.push_str("]{");
                output.push_str(&attr_parts.join(" "));
                output.push('}');
            }
        }
    }
}

/// Renders the body of a non-text inline node (without mark wrapping).
fn render_non_text_inline_body(
    node_type: &str,
    node: &AdfNode,
    output: &mut String,
    opts: &RenderOptions,
) {
    match node_type {
        "inlineCard" => {
            if let Some(ref attrs) = node.attrs {
                if let Some(url) = attrs.get("url").and_then(serde_json::Value::as_str) {
                    let mut attr_parts = Vec::new();
                    if url_safe_in_bracket_content(url) {
                        output.push_str(":card[");
                        output.push_str(url);
                        output.push(']');
                    } else {
                        // URL would break `:card[URL]` parsing (e.g. contains an
                        // unbalanced `]` or a newline).  Fall back to quoted
                        // attribute form so the URL round-trips losslessly.
                        output.push_str(":card[]");
                        let escaped = url.replace('\\', "\\\\").replace('"', "\\\"");
                        attr_parts.push(format!("url=\"{escaped}\""));
                    }
                    maybe_push_local_id(attrs, &mut attr_parts, opts);
                    if !attr_parts.is_empty() {
                        output.push('{');
                        output.push_str(&attr_parts.join(" "));
                        output.push('}');
                    }
                }
            }
        }
        "emoji" => {
            if let Some(ref attrs) = node.attrs {
                if let Some(short_name) = attrs.get("shortName").and_then(serde_json::Value::as_str)
                {
                    output.push(':');
                    let name = short_name.strip_prefix(':').unwrap_or(short_name);
                    let name = name.strip_suffix(':').unwrap_or(name);
                    output.push_str(name);
                    output.push(':');

                    let mut parts = Vec::new();
                    let escaped_sn = short_name.replace('\\', "\\\\").replace('"', "\\\"");
                    parts.push(format!("shortName=\"{escaped_sn}\""));
                    if let Some(id) = attrs.get("id").and_then(serde_json::Value::as_str) {
                        let escaped = id.replace('\\', "\\\\").replace('"', "\\\"");
                        parts.push(format!("id=\"{escaped}\""));
                    }
                    if let Some(text) = attrs.get("text").and_then(serde_json::Value::as_str) {
                        let escaped = text.replace('\\', "\\\\").replace('"', "\\\"");
                        parts.push(format!("text=\"{escaped}\""));
                    }
                    maybe_push_local_id(attrs, &mut parts, opts);
                    output.push('{');
                    output.push_str(&parts.join(" "));
                    output.push('}');
                }
            }
        }
        "status" => {
            if let Some(ref attrs) = node.attrs {
                let text = attrs
                    .get("text")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("");
                let color = attrs
                    .get("color")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("neutral");
                let mut attr_parts = vec![format!("color={color}")];
                if let Some(style) = attrs.get("style").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format!("style={style}"));
                }
                maybe_push_local_id(attrs, &mut attr_parts, opts);
                output.push_str(&format!(":status[{text}]{{{}}}", attr_parts.join(" ")));
            }
        }
        "date" => {
            if let Some(ref attrs) = node.attrs {
                if let Some(timestamp) = attrs.get("timestamp").and_then(serde_json::Value::as_str)
                {
                    let display = epoch_ms_to_iso_date(timestamp);
                    let mut attr_parts = vec![format!("timestamp={timestamp}")];
                    maybe_push_local_id(attrs, &mut attr_parts, opts);
                    output.push_str(&format!(":date[{display}]{{{}}}", attr_parts.join(" ")));
                }
            }
        }
        "mention" => {
            if let Some(ref attrs) = node.attrs {
                let id = attrs
                    .get("id")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("");
                let text = attrs
                    .get("text")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("");
                let mut attr_parts = vec![format!("id={id}")];
                if let Some(ut) = attrs.get("userType").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format!("userType={ut}"));
                }
                if let Some(al) = attrs.get("accessLevel").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format!("accessLevel={al}"));
                }
                maybe_push_local_id(attrs, &mut attr_parts, opts);
                output.push_str(&format!(":mention[{text}]{{{}}}", attr_parts.join(" ")));
            }
        }
        "placeholder" => {
            if let Some(ref attrs) = node.attrs {
                let text = attrs
                    .get("text")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("");
                output.push_str(&format!(":placeholder[{text}]"));
            }
        }
        "inlineExtension" => {
            if let Some(ref attrs) = node.attrs {
                let ext_type = attrs
                    .get("extensionType")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("");
                let ext_key = attrs
                    .get("extensionKey")
                    .and_then(serde_json::Value::as_str)
                    .unwrap_or("");
                let fallback = node.text.as_deref().unwrap_or("");
                output.push_str(&format!(
                    ":extension[{fallback}]{{type={ext_type} key={ext_key}}}"
                ));
            }
        }
        "mediaInline" => {
            if let Some(ref attrs) = node.attrs {
                let mut attr_parts = Vec::new();
                if let Some(media_type) = attrs.get("type").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format_kv("type", media_type));
                }
                if let Some(id) = attrs.get("id").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format_kv("id", id));
                }
                if let Some(collection) =
                    attrs.get("collection").and_then(serde_json::Value::as_str)
                {
                    attr_parts.push(format_kv("collection", collection));
                }
                if let Some(url) = attrs.get("url").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format_kv("url", url));
                }
                if let Some(alt) = attrs.get("alt").and_then(serde_json::Value::as_str) {
                    attr_parts.push(format_kv("alt", alt));
                }
                if let Some(width) = attrs.get("width").and_then(serde_json::Value::as_u64) {
                    attr_parts.push(format!("width={width}"));
                }
                if let Some(height) = attrs.get("height").and_then(serde_json::Value::as_u64) {
                    attr_parts.push(format!("height={height}"));
                }
                maybe_push_local_id(attrs, &mut attr_parts, opts);
                output.push_str(&format!(":media-inline[]{{{}}}", attr_parts.join(" ")));
            }
        }
        _ => {
            // Preserve an unsupported inline node losslessly as an
            // `:adf-unsupported[]{json="…"}` directive carrying the full node
            // JSON — the inline mirror of the block-level ```adf-unsupported```
            // fence (ADR-0029). Read back by `try_dispatch_inline_directive`,
            // so a read → edit → write round-trips instead of collapsing to a
            // lossy `<!-- unsupported inline -->` comment (issue #1117).
            if let Ok(json) = serde_json::to_string(node) {
                output.push_str(":adf-unsupported[]{");
                output.push_str(&format_kv("json", &json));
                output.push('}');
            }
        }
    }
}

/// Renders text with ADF marks applied as markdown syntax.
///
/// Mark ordering is preserved by walking the marks array in order and emitting
/// one wrapper per mark (outermost first, innermost last).  The resulting
/// markdown round-trips back to the original mark sequence because the parser
/// reconstructs marks outside-in from the nested delimiter structure.
///
/// When both `strong` and `em` are present, em is rendered with `_` instead of
/// `*` to avoid ambiguity (e.g., `_**text**_` rather than `***text***`).  The
/// single exception is `[strong, em]` (exactly those two marks in that order),
/// which is rendered as `***text***` to preserve the familiar compact form;
/// the parser's triple-delimiter rule round-trips it back to `[strong, em]`.
fn render_marked_text(text: &str, marks: &[AdfMark], output: &mut String) {
    if marks.iter().any(|m| m.mark_type == "code") {
        render_code_marked_text(text, marks, output);
        return;
    }

    let has_link = marks.iter().any(|m| m.mark_type == "link");
    let has_strong = marks.iter().any(|m| m.mark_type == "strong");
    let has_em = marks.iter().any(|m| m.mark_type == "em");

    // Compact form for the common [strong, em] case: ***text***.  em is
    // rendered with `*` here (as part of the `***` triple delimiter), so
    // underscores in the content don't need escaping.
    if marks.len() == 2 && marks[0].mark_type == "strong" && marks[1].mark_type == "em" {
        let escaped = escape_emphasis_markers(text);
        let escaped = escape_emoji_shortcodes(&escaped);
        let escaped = escape_backticks(&escaped);
        let escaped = escape_bare_urls(&escaped);
        output.push_str("***");
        output.push_str(&escaped);
        output.push_str("***");
        return;
    }

    // When both strong and em are present (in any order), em uses `_` instead
    // of `*` to avoid the `***` triple-delimiter ambiguity.  Otherwise em uses
    // `*`, which sidesteps intraword-underscore pitfalls for plain em text.
    let em_delim = if has_strong && has_em { "_" } else { "*" };

    // Text must also escape `_` when em renders as `_..._` — otherwise any
    // underscore in the content would close the emphasis span early.
    let escaped = if em_delim == "_" {
        escape_emphasis_markers_with_underscore(text)
    } else {
        escape_emphasis_markers(text)
    };
    let escaped = escape_emoji_shortcodes(&escaped);
    let escaped = escape_backticks(&escaped);
    // Always escape bare URLs so they are not re-parsed as `inlineCard`
    // nodes on round-trip.  When the text carries a link mark, also escape
    // `[` and `]` so they do not terminate the enclosing `[…]` link syntax
    // (issue #493).  Escaping bare URLs inside link text additionally
    // prevents `\[`/`\]` escapes from leaking through the URL-as-link-text
    // fast path and from corrupting an auto-detected bare URL inside the
    // link display text (issue #551).
    let escaped = escape_bare_urls(&escaped);
    let escaped = if has_link {
        escape_link_brackets(&escaped)
    } else {
        escaped
    };

    // Collect (open, close) wrappers in mark order, outermost first.  Consecutive
    // span-attr or bracketed-span marks that happen to be in the parser's
    // canonical order (so the merged wrapper parses back to the same mark
    // sequence) are merged into a single wrapper; otherwise each mark gets its
    // own nested wrapper so that the mark ordering survives the round-trip.
    let mut wrappers: Vec<(String, String)> = Vec::new();
    let mut i = 0;
    while i < marks.len() {
        match marks[i].mark_type.as_str() {
            "em" => {
                wrappers.push((em_delim.to_string(), em_delim.to_string()));
                i += 1;
            }
            "strong" => {
                wrappers.push(("**".to_string(), "**".to_string()));
                i += 1;
            }
            "strike" => {
                wrappers.push(("~~".to_string(), "~~".to_string()));
                i += 1;
            }
            "link" => {
                let href = link_href(&marks[i]);
                wrappers.push(("[".to_string(), format!("]({href})")));
                i += 1;
            }
            "textColor" | "backgroundColor" | "subsup" => {
                let start = i;
                while i < marks.len() && is_span_attr_mark(&marks[i].mark_type) {
                    i += 1;
                }
                emit_span_attr_wrappers(&marks[start..i], &mut wrappers);
            }
            "underline" | "annotation" => {
                let start = i;
                while i < marks.len() && is_bracketed_span_mark(&marks[i].mark_type) {
                    i += 1;
                }
                emit_bracketed_wrappers(&marks[start..i], &mut wrappers);
            }
            _ => {
                i += 1;
            }
        }
    }

    // Apply wrappers from innermost (last) to outermost (first).
    let mut result = escaped;
    for (open, close) in wrappers.iter().rev() {
        result.insert_str(0, open);
        result.push_str(close);
    }
    output.push_str(&result);
}

/// Renders a text node with a `code` mark.  Code content is emitted verbatim
/// inside backticks, optionally wrapped by a link and/or by `:span`/bracketed-
/// span carrying span-attr (`textColor`, `backgroundColor`, `subsup`) and
/// bracketed-span (`underline`, `annotation`) marks.  No `em`/`strong`/`strike`
/// formatting is applied because markdown code spans do not support nested
/// emphasis (issue #554: previously textColor/bg/subsup/underline were
/// silently dropped when combined with a code mark).
fn render_code_marked_text(text: &str, marks: &[AdfMark], output: &mut String) {
    let link_mark = marks.iter().find(|m| m.mark_type == "link");

    let mut code_str = String::new();
    if let Some(link_mark) = link_mark {
        let href = link_href(link_mark);
        code_str.push('[');
        render_inline_code(text, &mut code_str);
        code_str.push_str("](");
        code_str.push_str(href);
        code_str.push(')');
    } else {
        render_inline_code(text, &mut code_str);
    }

    // Build wrappers (outermost first) for span-attr and bracketed-span runs,
    // walking marks in order so the round-trip preserves mark ordering.
    let mut wrappers: Vec<(String, String)> = Vec::new();
    let mut i = 0;
    while i < marks.len() {
        match marks[i].mark_type.as_str() {
            "textColor" | "backgroundColor" | "subsup" => {
                let start = i;
                while i < marks.len() && is_span_attr_mark(&marks[i].mark_type) {
                    i += 1;
                }
                emit_span_attr_wrappers(&marks[start..i], &mut wrappers);
            }
            "underline" | "annotation" => {
                let start = i;
                while i < marks.len() && is_bracketed_span_mark(&marks[i].mark_type) {
                    i += 1;
                }
                emit_bracketed_wrappers(&marks[start..i], &mut wrappers);
            }
            _ => {
                i += 1;
            }
        }
    }

    // Apply wrappers from innermost (last) to outermost (first).
    let mut result = code_str;
    for (open, close) in wrappers.iter().rev() {
        result.insert_str(0, open);
        result.push_str(close);
    }
    output.push_str(&result);
}

/// Collects `:span` attribute fragments (color, bg, sub/sup) for a single mark.
fn collect_span_attr(mark: &AdfMark, attrs: &mut Vec<String>) {
    match mark.mark_type.as_str() {
        "textColor" => {
            if let Some(c) = mark
                .attrs
                .as_ref()
                .and_then(|a| a.get("color"))
                .and_then(serde_json::Value::as_str)
            {
                attrs.push(format!("color={c}"));
            }
        }
        "backgroundColor" => {
            if let Some(c) = mark
                .attrs
                .as_ref()
                .and_then(|a| a.get("color"))
                .and_then(serde_json::Value::as_str)
            {
                attrs.push(format!("bg={c}"));
            }
        }
        "subsup" => {
            if let Some(kind) = mark
                .attrs
                .as_ref()
                .and_then(|a| a.get("type"))
                .and_then(serde_json::Value::as_str)
            {
                attrs.push(kind.to_string());
            }
        }
        _ => {}
    }
}

/// Collects bracketed-span attribute fragments for an `underline` or `annotation` mark.
fn collect_bracketed_attr(mark: &AdfMark, attrs: &mut Vec<String>) {
    match mark.mark_type.as_str() {
        "underline" => attrs.push("underline".to_string()),
        "annotation" => {
            if let Some(ref a) = mark.attrs {
                if let Some(id) = a.get("id").and_then(serde_json::Value::as_str) {
                    let escaped = id.replace('\\', "\\\\").replace('"', "\\\"");
                    attrs.push(format!("annotation-id=\"{escaped}\""));
                }
                if let Some(at) = a.get("annotationType").and_then(serde_json::Value::as_str) {
                    attrs.push(format!("annotation-type={at}"));
                }
            }
        }
        _ => {}
    }
}

fn is_span_attr_mark(mark_type: &str) -> bool {
    matches!(mark_type, "textColor" | "backgroundColor" | "subsup")
}

fn is_bracketed_span_mark(mark_type: &str) -> bool {
    matches!(mark_type, "underline" | "annotation")
}

/// Canonical ordering for span-attr marks, matching the order in which the
/// `:span` directive parser reads attributes (`color`, then `bg`, then
/// `sub`/`sup`).
fn span_attr_order(mark_type: &str) -> u8 {
    match mark_type {
        "textColor" => 0,
        "backgroundColor" => 1,
        "subsup" => 2,
        _ => u8::MAX,
    }
}

/// Returns `true` if the run of span-attr marks is in the canonical order the
/// `:span` parser would produce.  A canonical run can be merged into one
/// `:span[...]{...}` wrapper; a non-canonical run must be split into one
/// nested wrapper per mark so the ordering survives the round-trip.
fn span_run_is_canonical(run: &[AdfMark]) -> bool {
    let mut prev = 0;
    for m in run {
        let order = span_attr_order(&m.mark_type);
        if order == u8::MAX || order < prev {
            return false;
        }
        prev = order;
    }
    true
}

/// Returns `true` if the run of `underline`/`annotation` marks is in the
/// canonical order the bracketed-span parser produces (`underline` first,
/// followed by annotations).  A canonical run can be merged into one
/// `[...]{underline annotation-id=...}` wrapper.
fn bracketed_run_is_canonical(run: &[AdfMark]) -> bool {
    let mut seen_annotation = false;
    for m in run {
        match m.mark_type.as_str() {
            "underline" => {
                if seen_annotation {
                    return false;
                }
            }
            "annotation" => seen_annotation = true,
            _ => return false,
        }
    }
    true
}

/// Emits one or more `:span[...]{...}` wrappers for a run of span-attr marks.
/// Canonical-order runs collapse into a single wrapper; non-canonical runs
/// emit one wrapper per mark so the order round-trips.
fn emit_span_attr_wrappers(run: &[AdfMark], wrappers: &mut Vec<(String, String)>) {
    if span_run_is_canonical(run) {
        let mut attrs = Vec::new();
        for m in run {
            collect_span_attr(m, &mut attrs);
        }
        wrappers.push((":span[".to_string(), format!("]{{{}}}", attrs.join(" "))));
        return;
    }
    for m in run {
        let mut attrs = Vec::new();
        collect_span_attr(m, &mut attrs);
        wrappers.push((":span[".to_string(), format!("]{{{}}}", attrs.join(" "))));
    }
}

/// Emits one or more `[...]{...}` wrappers for a run of `underline`/`annotation`
/// marks.  Canonical-order runs collapse into a single wrapper; non-canonical
/// runs emit one wrapper per mark so the order round-trips.
fn emit_bracketed_wrappers(run: &[AdfMark], wrappers: &mut Vec<(String, String)>) {
    if bracketed_run_is_canonical(run) {
        let mut attrs = Vec::new();
        for m in run {
            collect_bracketed_attr(m, &mut attrs);
        }
        wrappers.push(("[".to_string(), format!("]{{{}}}", attrs.join(" "))));
        return;
    }
    for m in run {
        let mut attrs = Vec::new();
        collect_bracketed_attr(m, &mut attrs);
        wrappers.push(("[".to_string(), format!("]{{{}}}", attrs.join(" "))));
    }
}

/// Extracts the href from a link mark.
fn link_href(mark: &AdfMark) -> &str {
    mark.attrs
        .as_ref()
        .and_then(|a| a.get("href"))
        .and_then(serde_json::Value::as_str)
        .unwrap_or("")
}

#[cfg(test)]
#[allow(
    clippy::unwrap_used,
    clippy::expect_used,
    clippy::needless_update,
    clippy::needless_collect,
    duplicate_macro_attributes
)]
mod tests {
    use super::*;

    // ── adf_to_plain_text tests ─────────────────────────────────────

    #[test]
    fn adf_to_plain_text_single_paragraph() {
        let doc = markdown_to_adf("Hello world").unwrap();
        assert_eq!(adf_to_plain_text(&doc), "Hello world");
    }

    #[test]
    fn adf_to_plain_text_multiple_paragraphs_space_separated() {
        let doc = markdown_to_adf("Alpha\n\nBeta").unwrap();
        let plain = adf_to_plain_text(&doc);
        // Blocks are space-separated so multi-paragraph anchor selections match.
        assert!(plain.contains("Alpha"));
        assert!(plain.contains("Beta"));
        assert_eq!(plain, "Alpha Beta");
    }

    #[test]
    fn adf_to_plain_text_drops_marks_but_keeps_text() {
        let doc = markdown_to_adf("Hello **bold** world").unwrap();
        assert_eq!(adf_to_plain_text(&doc), "Hello bold world");
    }

    #[test]
    fn adf_to_plain_text_empty_doc() {
        let doc = AdfDocument::new();
        assert_eq!(adf_to_plain_text(&doc), "");
    }

    #[test]
    fn adf_to_plain_text_leading_empty_block_emits_no_extra_space() {
        // An empty paragraph followed by a text-bearing one must not produce
        // a leading space — the separator logic skips when `out` is still empty.
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![
                AdfNode {
                    node_type: "paragraph".to_string(),
                    attrs: None,
                    content: Some(vec![]),
                    text: None,
                    marks: None,
                    local_id: None,
                    parameters: None,
                },
                AdfNode {
                    node_type: "paragraph".to_string(),
                    attrs: None,
                    content: Some(vec![AdfNode::text("Hello")]),
                    text: None,
                    marks: None,
                    local_id: None,
                    parameters: None,
                },
            ],
        };
        assert_eq!(adf_to_plain_text(&doc), "Hello");
    }

    // ── markdown_to_adf tests ───────────────────────────────────────

    #[test]
    fn paragraph() {
        let doc = markdown_to_adf("Hello world").unwrap();
        assert_eq!(doc.content.len(), 1);
        assert_eq!(doc.content[0].node_type, "paragraph");
    }

    #[test]
    fn heading_levels() {
        for level in 1..=6 {
            let hashes = "#".repeat(level);
            let md = format!("{hashes} Title");
            let doc = markdown_to_adf(&md).unwrap();
            assert_eq!(doc.content[0].node_type, "heading");
            let attrs = doc.content[0].attrs.as_ref().unwrap();
            assert_eq!(attrs["level"], level as u64);
        }
    }

    // ── issue #1005: inline `code` is not permitted on headings ─────

    #[test]
    fn heading_inline_code_mark_stripped() {
        // `### `GET /api`` parses an inline-code span; ADF forbids the `code`
        // mark on headings, so it is stripped and the text kept as plain.
        let doc = markdown_to_adf("### `GET /api`").unwrap();
        let heading = &doc.content[0];
        assert_eq!(heading.node_type, "heading");
        let content = heading.content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("GET /api"));
        assert!(
            content[0].marks.is_none(),
            "expected no marks, got: {:?}",
            content[0].marks
        );
    }

    #[test]
    fn heading_code_strip_preserves_sibling_strong() {
        // `### **`x`**` → text `x` carrying `strong`; only `code` is removed.
        let doc = markdown_to_adf("### **`x`**").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        let marks = content[0].marks.as_ref().unwrap();
        assert!(marks.iter().any(|m| m.mark_type == "strong"));
        assert!(!marks.iter().any(|m| m.mark_type == "code"));
    }

    #[test]
    fn heading_code_strip_preserves_link() {
        // `### [`x`](url)` → text `x` carrying `link`; only `code` is removed.
        let doc = markdown_to_adf("### [`x`](https://e.com)").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        let marks = content[0].marks.as_ref().unwrap();
        assert!(marks.iter().any(|m| m.mark_type == "link"));
        assert!(!marks.iter().any(|m| m.mark_type == "code"));
    }

    #[test]
    fn heading_with_code_now_passes_validation() {
        // End-to-end guard: the converted document no longer trips the ADF
        // mark validator that previously rejected it at write time.
        let doc = markdown_to_adf("### `GET /api`").unwrap();
        let violations = crate::atlassian::adf_schema::validate_document(&doc);
        assert!(violations.is_empty(), "got: {violations:?}");
    }

    #[test]
    fn paragraph_inline_code_mark_preserved() {
        // Regression guard: the strip is heading-only — paragraph inline code
        // keeps its `code` mark.
        let doc = markdown_to_adf("`x`").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        let marks = content[0].marks.as_ref().unwrap();
        assert!(marks.iter().any(|m| m.mark_type == "code"));
    }

    // ── strong/em/strike around inline code split silently (issue #1391) ──

    /// Returns the mark types on `node`, empty when unmarked.
    fn mark_types(node: &AdfNode) -> Vec<&str> {
        node.marks
            .as_ref()
            .map(|marks| marks.iter().map(|m| m.mark_type.as_str()).collect())
            .unwrap_or_default()
    }

    #[test]
    fn split_strong_code_single_run() {
        // `**`x`**` → one run carrying only `code`; the leaked `strong` is
        // dropped so the ADF is legal and renders identically.
        let doc = markdown_to_adf("**`x`**").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("x"));
        assert_eq!(mark_types(&content[0]), vec!["code"]);
    }

    #[test]
    fn split_em_code_single_run() {
        let doc = markdown_to_adf("*`x`*").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(mark_types(&content[0]), vec!["code"]);
    }

    #[test]
    fn split_strike_code_single_run() {
        let doc = markdown_to_adf("~~`x`~~").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(mark_types(&content[0]), vec!["code"]);
    }

    #[test]
    fn split_strong_em_code_drops_both() {
        let doc = markdown_to_adf("***`x`***").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(mark_types(&content[0]), vec!["code"]);
    }

    #[test]
    fn split_nested_code_keeps_sibling_strong() {
        // `**foo `bar` baz**` → three runs; only the code run drops `strong`,
        // so the bold prose around the identifier is preserved.
        let doc = markdown_to_adf("**foo `bar` baz**").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 3);
        assert_eq!(content[0].text.as_deref(), Some("foo "));
        assert_eq!(mark_types(&content[0]), vec!["strong"]);
        assert_eq!(content[1].text.as_deref(), Some("bar"));
        assert_eq!(mark_types(&content[1]), vec!["code"]);
        assert_eq!(content[2].text.as_deref(), Some(" baz"));
        assert_eq!(mark_types(&content[2]), vec!["strong"]);
    }

    #[test]
    fn split_multiple_hits_in_one_line() {
        let doc = markdown_to_adf("**`x`** and **`y`**").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 3);
        assert_eq!(mark_types(&content[0]), vec!["code"]);
        assert_eq!(content[1].text.as_deref(), Some(" and "));
        assert!(content[1].marks.is_none());
        assert_eq!(mark_types(&content[2]), vec!["code"]);
    }

    #[test]
    fn split_leaves_separate_runs_untouched() {
        // Marks already on separate runs never triggered the constraint.
        let doc = markdown_to_adf("**foo** `bar`").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(mark_types(&content[0]), vec!["strong"]);
        assert_eq!(content[1].text.as_deref(), Some(" "));
        assert_eq!(mark_types(&content[2]), vec!["code"]);
    }

    #[test]
    fn split_preserves_link_on_code_run() {
        // `code+link` is legal ADF; only `strong` drops off the code run.
        let doc = markdown_to_adf("**[`x`](https://e.com)**").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(mark_types(&content[0]), vec!["link", "code"]);
    }

    #[test]
    fn split_keeps_span_syntax_marks_for_validator() {
        // `[`x`]{underline}` is an explicit span-syntax request: the converter
        // preserves it byte-faithfully (issue #554 fidelity) and the mark
        // validator still reports the illegal combination at write time.
        let doc = markdown_to_adf("[`x`]{underline}").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(mark_types(&content[0]), vec!["underline", "code"]);
    }

    #[test]
    fn split_runs_after_heading_strip_bold_kept() {
        // Ordering guard: the heading builder strips `code` first (#1005), so
        // the document-level split pass must leave the heading's bold intact
        // rather than dropping `strong` before the strip runs.
        let doc = markdown_to_adf("# **`x`**").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(mark_types(&content[0]), vec!["strong"]);
    }

    #[test]
    fn split_applies_inside_containers() {
        // The pass recurses through block containers, not just paragraphs.
        let doc = markdown_to_adf("- **`x`**").unwrap();
        let list_item = &doc.content[0].content.as_ref().unwrap()[0];
        let paragraph = &list_item.content.as_ref().unwrap()[0];
        let content = paragraph.content.as_ref().unwrap();
        assert_eq!(mark_types(&content[0]), vec!["code"]);
    }

    #[test]
    fn split_strong_code_passes_validation() {
        // End-to-end guard: the issue #1391 reproducer no longer trips the
        // mark validator that previously rejected the whole write.
        let doc = markdown_to_adf(
            "**Testing `widget` itself is out of scope for this ticket** — coordinate \
             with the team that owns the widget credentials.",
        )
        .unwrap();
        let violations = crate::atlassian::adf_schema::validate_document(&doc);
        assert!(violations.is_empty(), "got: {violations:?}");
    }

    #[test]
    fn code_block() {
        let md = "```rust\nfn main() {}\n```";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "codeBlock");
        let attrs = doc.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["language"], "rust");
    }

    #[test]
    fn code_block_no_language() {
        let md = "```\nsome code\n```";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "codeBlock");
        assert!(doc.content[0].attrs.is_none());
    }

    #[test]
    fn code_block_empty_language() {
        let md = "```\"\"\nsome code\n```";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "codeBlock");
        let attrs = doc.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["language"], "");
    }

    #[test]
    fn horizontal_rule() {
        let doc = markdown_to_adf("---").unwrap();
        assert_eq!(doc.content[0].node_type, "rule");
    }

    #[test]
    fn horizontal_rule_stars() {
        let doc = markdown_to_adf("***").unwrap();
        assert_eq!(doc.content[0].node_type, "rule");
    }

    #[test]
    fn blockquote() {
        let md = "> This is a quote\n> Second line";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "blockquote");
    }

    #[test]
    fn bullet_list() {
        let md = "- Item 1\n- Item 2\n- Item 3";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "bulletList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 3);
    }

    #[test]
    fn ordered_list() {
        let md = "1. First\n2. Second\n3. Third";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "orderedList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 3);
    }

    // ── nested list sibling detection (issue #1727) ─────────────────

    /// Returns the text of a list item's first paragraph.
    fn item_text(item: &AdfNode) -> &str {
        item.content.as_ref().unwrap()[0].content.as_ref().unwrap()[0]
            .text
            .as_deref()
            .unwrap()
    }

    /// Regression: a sibling item of a nested list (same indent as the
    /// preceding nested item) must stay a sibling instead of becoming a
    /// child of the preceding item, which rendered as a "staircase" in
    /// Jira (first sub-item letters, the rest roman numerals).
    #[test]
    fn nested_ordered_list_sibling_stays_sibling() {
        let md = "1. Родитель:\n    1. Пункт А\n    2. Пункт Б\n2. Следующий пункт";
        let doc = markdown_to_adf(md).unwrap();
        let outer = doc.content[0].content.as_ref().unwrap();
        assert_eq!(outer.len(), 2);
        // First item: paragraph plus one nested orderedList with two
        // sibling items.
        let first = outer[0].content.as_ref().unwrap();
        assert_eq!(first.len(), 2);
        assert_eq!(first[0].node_type, "paragraph");
        assert_eq!(first[1].node_type, "orderedList");
        // A start-at-1 nested list carries no `order` attr.
        assert!(first[1].attrs.is_none());
        let nested_items = first[1].content.as_ref().unwrap();
        assert_eq!(nested_items.len(), 2);
        assert_eq!(item_text(&nested_items[0]), "Пункт А");
        assert_eq!(item_text(&nested_items[1]), "Пункт Б");
        // The sibling line was not swallowed as sub-content of «Пункт А»:
        // the second top-level item is a plain single-paragraph listItem.
        let second = outer[1].content.as_ref().unwrap();
        assert_eq!(second.len(), 1);
        assert_eq!(item_text(&outer[1]), "Следующий пункт");
    }

    #[test]
    fn nested_unordered_list_sibling_stays_sibling() {
        let md = "- Родитель:\n    - Пункт А\n    - Пункт Б\n- Следующий пункт";
        let doc = markdown_to_adf(md).unwrap();
        let outer = doc.content[0].content.as_ref().unwrap();
        assert_eq!(outer.len(), 2);
        let first = outer[0].content.as_ref().unwrap();
        assert_eq!(first.len(), 2);
        assert_eq!(first[1].node_type, "bulletList");
        assert_eq!(first[1].content.as_ref().unwrap().len(), 2);
        assert_eq!(item_text(&outer[1]), "Следующий пункт");
    }

    #[test]
    fn mixed_nested_list_ordered_outer_unordered_inner() {
        let md = "1. Родитель:\n    - Пункт А\n    - Пункт Б\n2. Следующий пункт";
        let doc = markdown_to_adf(md).unwrap();
        let outer = doc.content[0].content.as_ref().unwrap();
        assert_eq!(outer.len(), 2);
        let first = outer[0].content.as_ref().unwrap();
        assert_eq!(first[1].node_type, "bulletList");
        assert_eq!(first[1].content.as_ref().unwrap().len(), 2);
        assert_eq!(item_text(&outer[1]), "Следующий пункт");
    }

    #[test]
    fn mixed_nested_list_unordered_outer_ordered_inner() {
        let md = "- Родитель:\n    1. Пункт А\n    2. Пункт Б\n- Следующий пункт";
        let doc = markdown_to_adf(md).unwrap();
        let outer = doc.content[0].content.as_ref().unwrap();
        assert_eq!(outer.len(), 2);
        let first = outer[0].content.as_ref().unwrap();
        assert_eq!(first[1].node_type, "orderedList");
        assert!(first[1].attrs.is_none());
        assert_eq!(first[1].content.as_ref().unwrap().len(), 2);
        assert_eq!(item_text(&outer[1]), "Следующий пункт");
    }

    /// Top-level numbering continues after the nested block: following
    /// items stay at the outer level with their own numbers.
    #[test]
    fn top_level_numbering_continues_after_nested_block() {
        let md = "1. Первый\n    1. Вложенный\n    2. Тоже вложенный\n2. Второй\n3. Третий";
        let doc = markdown_to_adf(md).unwrap();
        let list = &doc.content[0];
        assert!(list.attrs.is_none());
        let outer = list.content.as_ref().unwrap();
        assert_eq!(outer.len(), 3);
        assert_eq!(item_text(&outer[1]), "Второй");
        assert_eq!(item_text(&outer[2]), "Третий");
        // Each trailing item is a plain single-paragraph listItem.
        for item in &outer[1..] {
            assert_eq!(item.content.as_ref().unwrap().len(), 1);
        }
    }

    /// Sibling detection works at any nesting depth: the deepest level
    /// keeps its two items as siblings inside one list.
    #[test]
    fn nested_list_three_levels_sibling_stays_sibling() {
        let md = "1. L1\n    1. L2a\n        1. L3a\n        2. L3b\n    2. L2b\n2. L1b";
        let doc = markdown_to_adf(md).unwrap();
        let outer = doc.content[0].content.as_ref().unwrap();
        assert_eq!(outer.len(), 2);
        // Level 2.
        let l1 = outer[0].content.as_ref().unwrap();
        assert_eq!(l1.len(), 2);
        let level2 = l1[1].content.as_ref().unwrap();
        assert_eq!(level2.len(), 2);
        assert_eq!(item_text(&level2[0]), "L2a");
        assert_eq!(item_text(&level2[1]), "L2b");
        // Level 3: two siblings under L2a.
        let l2a = level2[0].content.as_ref().unwrap();
        assert_eq!(l2a.len(), 2);
        let level3 = l2a[1].content.as_ref().unwrap();
        assert_eq!(level3.len(), 2);
        assert_eq!(item_text(&level3[0]), "L3a");
        assert_eq!(item_text(&level3[1]), "L3b");
        // L2b and L1b stay plain single-paragraph listItems.
        assert_eq!(level2[1].content.as_ref().unwrap().len(), 1);
        assert_eq!(outer[1].content.as_ref().unwrap().len(), 1);
    }

    #[test]
    fn nested_task_list_sibling_stays_sibling() {
        let md = "- [ ] Родитель\n    - [ ] Подзадача А\n    - [ ] Подзадача Б";
        let doc = markdown_to_adf(md).unwrap();
        let items = doc.content[0].content.as_ref().unwrap();
        // The indented taskList becomes a sibling of the parent taskItem
        // (issue #506) and keeps both sub-items as siblings.
        assert_eq!(items.len(), 2);
        assert_eq!(items[1].node_type, "taskList");
        let sub_items = items[1].content.as_ref().unwrap();
        assert_eq!(sub_items.len(), 2);
        assert_eq!(sub_items[0].node_type, "taskItem");
        assert_eq!(sub_items[1].node_type, "taskItem");
    }

    /// A nested item whose text ends in a hardBreak marker (two trailing
    /// spaces) must not swallow the next sibling as continuation text.
    #[test]
    fn nested_item_ending_in_hardbreak_keeps_next_sibling() {
        let md = "1. Родитель:\n    1. Пункт А  \n    2. Пункт Б\n2. Следующий";
        let doc = markdown_to_adf(md).unwrap();
        let outer = doc.content[0].content.as_ref().unwrap();
        assert_eq!(outer.len(), 2);
        let nested = outer[0].content.as_ref().unwrap()[1]
            .content
            .as_ref()
            .unwrap();
        assert_eq!(nested.len(), 2, "nested items: {nested:?}");
        assert_eq!(item_text(&nested[1]), "Пункт Б");
    }

    /// A continuation paragraph written at the nested marker's own column
    /// still belongs to that nested item (unchanged from before #1727).
    #[test]
    fn nested_item_continuation_paragraph_stays_in_item() {
        let md = "1. Parent:\n    1. Child one\n    Continuation of child one";
        let doc = markdown_to_adf(md).unwrap();
        let outer = doc.content[0].content.as_ref().unwrap();
        assert_eq!(outer.len(), 1);
        let parent = outer[0].content.as_ref().unwrap();
        assert_eq!(parent.len(), 2, "parent content: {parent:?}");
        let child = parent[1].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        assert_eq!(child.len(), 2);
        assert_eq!(child[1].node_type, "paragraph");
        assert_eq!(
            child[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("Continuation of child one")
        );
    }

    /// A fenced code block written at the nested marker's own column still
    /// belongs to that nested item (unchanged from before #1727).
    #[test]
    fn nested_item_fenced_code_block_stays_in_item() {
        let md = "- Parent\n    - Child\n    ```bash\n    echo hi\n    ```";
        let doc = markdown_to_adf(md).unwrap();
        let parent = doc.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let child = parent[1].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        assert_eq!(child.len(), 2, "child content: {child:?}");
        assert_eq!(child[1].node_type, "codeBlock");
        assert_eq!(
            child[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("echo hi")
        );
    }

    /// Indentation is counted in ASCII spaces: an NBSP before the parent
    /// marker (common in text pasted from Confluence) must not push the
    /// sibling threshold out and un-nest genuine 2-space children.
    #[test]
    fn nbsp_before_marker_keeps_children_nested() {
        let md = "\u{a0}- Parent\n  - Child\n- Next";
        let doc = markdown_to_adf(md).unwrap();
        let outer = doc.content[0].content.as_ref().unwrap();
        assert_eq!(outer.len(), 2, "outer items: {outer:?}");
        let parent = outer[0].content.as_ref().unwrap();
        assert_eq!(parent.len(), 2);
        assert_eq!(parent[1].node_type, "bulletList");
        assert_eq!(item_text(&outer[1]), "Next");
    }

    // ── surplus continuation indent (issue #1735) ────────────

    /// Continuation text written at CommonMark's natural column for a `1. `
    /// marker (3 spaces) must not keep the surplus space as literal text.
    #[test]
    fn ordered_item_continuation_at_natural_column_no_surplus() {
        let md = "1. a\n   more\n";
        let doc = markdown_to_adf(md).unwrap();
        let item = doc.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        assert_eq!(item.len(), 2, "item content: {item:?}");
        assert_eq!(
            item[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("more")
        );
    }

    /// Same as above, with the #1732 blank-line lookahead routing the
    /// continuation through the blank-line branch instead of the main loop.
    #[test]
    fn ordered_item_continuation_after_blank_at_natural_column_no_surplus() {
        let md = "1. a\n\n   more\n";
        let doc = markdown_to_adf(md).unwrap();
        let item = doc.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        assert_eq!(item.len(), 2, "item content: {item:?}");
        assert_eq!(
            item[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("more")
        );
    }

    /// A bullet item's continuation indented deeper than the mandatory
    /// 2-space column (4 spaces here) must not keep any surplus.
    #[test]
    fn bullet_item_continuation_deep_indent_no_surplus() {
        let md = "- a\n    deep\n";
        let doc = markdown_to_adf(md).unwrap();
        let item = doc.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        assert_eq!(item.len(), 2, "item content: {item:?}");
        assert_eq!(
            item[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("deep")
        );
    }

    /// A fence written one column deeper than the item's natural content
    /// column: before this fix it isn't even recognized as a fence (the
    /// opener keeps a leading space and fails the column-0 check); the
    /// dedent both removes the surplus and lets the fence be recognized.
    #[test]
    fn item_fence_one_column_deeper_than_natural_is_recognized_and_dedented() {
        let md = "- a\n   ```bash\n   echo hi\n   ```";
        let doc = markdown_to_adf(md).unwrap();
        let item = doc.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        assert_eq!(item.len(), 2, "item content: {item:?}");
        assert_eq!(item[1].node_type, "codeBlock");
        assert_eq!(
            item[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("echo hi")
        );
    }

    /// Surplus indentation is removed independently at every nesting depth
    /// for a hand-formatted 4-space-per-level list with a genuine
    /// continuation line before each nested marker.
    #[test]
    fn surplus_indent_removed_at_every_nesting_depth() {
        let md = "- L1\n    text1\n    - L2\n        text2\n        - L3\n            text3\n";
        let doc = markdown_to_adf(md).unwrap();
        let l1 = doc.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        assert_eq!(l1.len(), 3, "L1 content: {l1:?}");
        assert_eq!(
            l1[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("text1")
        );
        let l2 = l1[2].content.as_ref().unwrap()[0].content.as_ref().unwrap();
        assert_eq!(l2.len(), 3, "L2 content: {l2:?}");
        assert_eq!(
            l2[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("text2")
        );
        let l3 = l2[2].content.as_ref().unwrap()[0].content.as_ref().unwrap();
        assert_eq!(l3.len(), 2, "L3 content: {l3:?}");
        assert_eq!(
            l3[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("text3")
        );
    }

    /// Same fix at the task-list call site.
    #[test]
    fn task_item_continuation_at_natural_column_no_surplus() {
        let md = "- [ ] a\n   deep\n";
        let doc = markdown_to_adf(md).unwrap();
        let item = &doc.content[0].content.as_ref().unwrap()[0];
        let content = item.content.as_ref().unwrap();
        assert_eq!(content.len(), 2, "task item content: {content:?}");
        assert_eq!(content[1].node_type, "paragraph");
        assert_eq!(
            content[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("deep")
        );
    }

    // ── blank line before indented content (issue #1732) ────────────

    /// A bare blank line followed by content indented to the item's column
    /// does not end the item: the nested list stays nested and the
    /// following top-level sibling is not swallowed as its own content.
    #[test]
    fn blank_line_before_nested_ordered_list_keeps_it_nested() {
        let md = "1. Родитель:\n\n    1. А\n    2. Б\n2. Следующий";
        let doc = markdown_to_adf(md).unwrap();
        let outer = doc.content[0].content.as_ref().unwrap();
        assert_eq!(outer.len(), 2, "outer items: {outer:?}");
        let first = outer[0].content.as_ref().unwrap();
        assert_eq!(first.len(), 2, "first item content: {first:?}");
        assert_eq!(first[0].node_type, "paragraph");
        assert_eq!(item_text(&outer[0]), "Родитель:");
        assert_eq!(first[1].node_type, "orderedList");
        let nested_items = first[1].content.as_ref().unwrap();
        assert_eq!(nested_items.len(), 2, "nested items: {nested_items:?}");
        assert_eq!(item_text(&nested_items[0]), "А");
        assert_eq!(item_text(&nested_items[1]), "Б");
        // The second top-level item was not swallowed as sub-content of
        // the nested list and carries no leaked indentation.
        let second = outer[1].content.as_ref().unwrap();
        assert_eq!(second.len(), 1, "second item content: {second:?}");
        assert_eq!(item_text(&outer[1]), "Следующий");
    }

    /// A bare blank line followed by an indented plain paragraph is a
    /// continuation paragraph of the same list item, not a top-level
    /// paragraph with leaked indentation.
    #[test]
    fn blank_line_before_continuation_paragraph_stays_in_item() {
        let md = "- a\n\n  second paragraph\n- b";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content.len(), 1, "top-level blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "bulletList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2, "items: {items:?}");
        let first = items[0].content.as_ref().unwrap();
        assert_eq!(first.len(), 2, "first item content: {first:?}");
        assert_eq!(first[0].node_type, "paragraph");
        assert_eq!(item_text(&items[0]), "a");
        assert_eq!(first[1].node_type, "paragraph");
        assert_eq!(
            first[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("second paragraph")
        );
        assert_eq!(item_text(&items[1]), "b");
    }

    /// A blank line followed by a non-indented line still ends the list —
    /// unchanged from before #1732.
    #[test]
    fn blank_line_before_unindented_line_still_ends_list() {
        let md = "- a\n\nPara";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content.len(), 2, "top-level blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "bulletList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 1);
        assert_eq!(item_text(&items[0]), "a");
        assert_eq!(doc.content[1].node_type, "paragraph");
        assert_eq!(
            doc.content[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("Para")
        );
    }

    /// Two or more consecutive bare blank lines before indented content are
    /// collected the same way as a single blank line.
    #[test]
    fn multiple_blank_lines_before_continuation_paragraph_stay_in_item() {
        let md = "- a\n\n\n  second paragraph";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content.len(), 1, "top-level blocks: {:?}", doc.content);
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 1);
        let first = items[0].content.as_ref().unwrap();
        assert_eq!(first.len(), 2, "first item content: {first:?}");
        assert_eq!(
            first[1].content.as_ref().unwrap()[0].text.as_deref(),
            Some("second paragraph")
        );
    }

    /// Sibling detection at a deeper nesting level still applies with a
    /// blank line before the deepest level's content (mirrors
    /// `nested_list_three_levels_sibling_stays_sibling`).
    #[test]
    fn blank_line_before_deepest_level_keeps_siblings() {
        let md = "1. L1\n    1. L2a\n\n        1. L3a\n        2. L3b\n    2. L2b\n2. L1b";
        let doc = markdown_to_adf(md).unwrap();
        let outer = doc.content[0].content.as_ref().unwrap();
        assert_eq!(outer.len(), 2);
        let l1 = outer[0].content.as_ref().unwrap();
        assert_eq!(l1.len(), 2);
        let level2 = l1[1].content.as_ref().unwrap();
        assert_eq!(level2.len(), 2);
        assert_eq!(item_text(&level2[0]), "L2a");
        assert_eq!(item_text(&level2[1]), "L2b");
        let l2a = level2[0].content.as_ref().unwrap();
        assert_eq!(l2a.len(), 2, "L2a content: {l2a:?}");
        let level3 = l2a[1].content.as_ref().unwrap();
        assert_eq!(level3.len(), 2, "level3 items: {level3:?}");
        assert_eq!(item_text(&level3[0]), "L3a");
        assert_eq!(item_text(&level3[1]), "L3b");
        assert_eq!(level2[1].content.as_ref().unwrap().len(), 1);
        assert_eq!(outer[1].content.as_ref().unwrap().len(), 1);
        assert_eq!(item_text(&outer[1]), "L1b");
    }

    /// A blank line before an indented nested task list produces the same
    /// sibling-taskList shape (#506) as the two-space-blank form.
    #[test]
    fn blank_line_before_nested_task_list_matches_two_space_form() {
        let with_bare_blank = markdown_to_adf("- [ ] t\n\n  - [ ] sub").unwrap();
        let with_two_space_blank = markdown_to_adf("- [ ] t\n  \n  - [ ] sub").unwrap();
        assert_eq!(
            serde_json::to_value(&with_bare_blank).unwrap(),
            serde_json::to_value(&with_two_space_blank).unwrap()
        );
        let items = with_bare_blank.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2, "items: {items:?}");
        assert_eq!(items[0].node_type, "taskItem");
        assert_eq!(items[1].node_type, "taskList");
        let sub_items = items[1].content.as_ref().unwrap();
        assert_eq!(sub_items.len(), 1);
        assert_eq!(sub_items[0].node_type, "taskItem");
    }

    /// A blank line followed by a same-indent sibling marker is a loose
    /// list (CommonMark): the parser splits it into two lists and
    /// [`merge_adjacent_lists`] fuses them back into one (issue #1729).
    #[test]
    fn blank_line_then_sibling_marker_becomes_one_list() {
        let md = "- a\n\n- b";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content.len(), 1, "top-level blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "bulletList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2, "items: {items:?}");
        assert_eq!(item_text(&items[0]), "a");
        assert_eq!(item_text(&items[1]), "b");
    }

    /// Round-trip pin: a listItem with two paragraphs renders with a
    /// blank (two-space) separator line, and re-parsing it must reproduce
    /// the same document — the renderer is untouched by #1732.
    #[test]
    fn round_trip_blank_line_separated_paragraphs_in_list_item() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[{"type":"bulletList","content":[
                {"type":"listItem","content":[
                    {"type":"paragraph","content":[{"type":"text","text":"a"}]},
                    {"type":"paragraph","content":[{"type":"text","text":"b"}]}
                ]}
            ]}]}"#,
            "- a\n  \n  b\n",
        );
    }

    /// Round-trip pin: a listItem with a nested bulletList renders with no
    /// blank separator line, and re-parsing it must reproduce the same
    /// document.
    #[test]
    fn round_trip_nested_list_no_blank_separator() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[{"type":"bulletList","content":[
                {"type":"listItem","content":[
                    {"type":"paragraph","content":[{"type":"text","text":"p"}]},
                    {"type":"bulletList","content":[
                        {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"x"}]}]}
                    ]}
                ]}
            ]}]}"#,
            "- p\n  - x\n",
        );
    }

    // ── loose lists fuse; `{list=separate}` keeps them apart (issue #1729) ──
    // Parser cases adapted from #1731 by Nord1cWarr1or.

    /// A CommonMark loose ordered list — items separated by blank lines —
    /// is one list, not one list per item.
    #[test]
    fn loose_ordered_list_merges_into_one() {
        let doc = markdown_to_adf("1. а\n\n2. б\n\n3. в").unwrap();
        assert_eq!(doc.content.len(), 1, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "orderedList");
        assert!(doc.content[0].attrs.is_none(), "{:?}", doc.content[0].attrs);
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 3, "items: {items:?}");
        assert_eq!(item_text(&items[0]), "а");
        assert_eq!(item_text(&items[1]), "б");
        assert_eq!(item_text(&items[2]), "в");
    }

    /// The bullet form of [`loose_ordered_list_merges_into_one`].
    #[test]
    fn loose_bullet_list_merges_into_one() {
        let doc = markdown_to_adf("- а\n\n- б\n\n- в").unwrap();
        assert_eq!(doc.content.len(), 1, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "bulletList");
        assert!(doc.content[0].attrs.is_none());
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 3, "items: {items:?}");
    }

    /// Task lists fuse like bullet lists — the blank line is the author's
    /// spacing, not a list boundary.
    #[test]
    fn loose_task_list_merges_into_one() {
        let doc = markdown_to_adf("- [ ] а\n\n- [x] б").unwrap();
        assert_eq!(doc.content.len(), 1, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "taskList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2, "items: {items:?}");
        assert_eq!(items[0].node_type, "taskItem");
        assert_eq!(items[1].node_type, "taskItem");
    }

    /// A checkbox marker opens a different kind of list, so it ends the
    /// bullet list rather than continuing it.
    #[test]
    fn loose_bullet_then_task_list_not_merged() {
        let doc = markdown_to_adf("- а\n\n- [ ] б").unwrap();
        assert_eq!(doc.content.len(), 2, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "bulletList");
        assert_eq!(doc.content[1].node_type, "taskList");
    }

    /// The tight (no blank line) form of [`loose_bullet_then_task_list_not_merged`]:
    /// without the marker-mismatch break, `parse_bullet_list` used to mix a
    /// `listItem` into a `taskList` and produce invalid ADF (issue #1736).
    #[test]
    fn tight_bullet_then_task_list_not_merged() {
        let doc = markdown_to_adf("- b\n- [ ] t\n").unwrap();
        assert_eq!(doc.content.len(), 2, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "bulletList");
        assert_eq!(doc.content[1].node_type, "taskList");
        assert_eq!(item_text(&doc.content[0].content.as_ref().unwrap()[0]), "b");
        let task_items = doc.content[1].content.as_ref().unwrap();
        assert_eq!(task_items[0].node_type, "taskItem");
        assert_eq!(
            task_items[0].content.as_ref().unwrap()[0].text.as_deref(),
            Some("t")
        );
    }

    /// The reverse of [`tight_bullet_then_task_list_not_merged`].
    #[test]
    fn tight_task_then_bullet_list_not_merged() {
        let doc = markdown_to_adf("- [ ] t\n- b\n").unwrap();
        assert_eq!(doc.content.len(), 2, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "taskList");
        assert_eq!(doc.content[1].node_type, "bulletList");
        let task_items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(task_items[0].node_type, "taskItem");
        assert_eq!(
            task_items[0].content.as_ref().unwrap()[0].text.as_deref(),
            Some("t")
        );
        assert_eq!(item_text(&doc.content[1].content.as_ref().unwrap()[0]), "b");
    }

    /// A tight run of only bullets is unaffected by the #1736 fix.
    #[test]
    fn tight_bullet_run_unchanged() {
        let doc = markdown_to_adf("- a\n- b\n").unwrap();
        assert_eq!(doc.content.len(), 1, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "bulletList");
        assert_eq!(doc.content[0].content.as_ref().unwrap().len(), 2);
    }

    /// A tight run of only task items is unaffected by the #1736 fix.
    #[test]
    fn tight_task_run_unchanged() {
        let doc = markdown_to_adf("- [ ] a\n- [ ] b\n").unwrap();
        assert_eq!(doc.content.len(), 1, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "taskList");
        assert_eq!(doc.content[0].content.as_ref().unwrap().len(), 2);
    }

    /// The #1736 fix applies inside a list item's sub-content too, since
    /// nested content is parsed by the same recursive `parse_blocks`.
    #[test]
    fn tight_bullet_then_task_list_not_merged_in_list_item() {
        let doc = markdown_to_adf("- x\n  - b\n  - [ ] t\n").unwrap();
        assert_eq!(doc.content.len(), 1, "blocks: {:?}", doc.content);
        let outer_items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(outer_items.len(), 1, "outer items: {outer_items:?}");
        let children = outer_items[0].content.as_ref().unwrap();
        assert_eq!(children.len(), 3, "children: {children:?}");
        assert_eq!(children[1].node_type, "bulletList");
        assert_eq!(children[2].node_type, "taskList");
    }

    /// A genuine restart keeps the author's number: CommonMark would fuse
    /// and renumber `5.` to `3.`, which is a deliberate JFM deviation.
    #[test]
    fn ordered_lists_with_numbering_restart_not_merged() {
        let doc = markdown_to_adf("1. а\n2. б\n\n5. в").unwrap();
        assert_eq!(doc.content.len(), 2, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].content.as_ref().unwrap().len(), 2);
        assert_eq!(
            doc.content[1].attrs.as_ref().and_then(|a| a.get("order")),
            Some(&serde_json::json!(5))
        );
    }

    /// Repeated `1.` markers are one list — CommonMark treats `1.` as a
    /// "don't-care" number and numbers items by position.
    #[test]
    fn ordered_lists_both_starting_at_one_merge() {
        let doc = markdown_to_adf("1. а\n2. б\n\n1. в\n2. г").unwrap();
        assert_eq!(doc.content.len(), 1, "blocks: {:?}", doc.content);
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 4, "items: {items:?}");
        assert_eq!(item_text(&items[3]), "г");
    }

    /// Lists of different types are never fused.
    #[test]
    fn ordered_and_bullet_lists_not_merged() {
        let doc = markdown_to_adf("1. а\n\n- б").unwrap();
        assert_eq!(doc.content.len(), 2, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "orderedList");
        assert_eq!(doc.content[1].node_type, "bulletList");
    }

    /// Only an item of the *same* list continues it — a paragraph between
    /// two lists is a wall.
    #[test]
    fn lists_separated_by_paragraph_not_merged() {
        let doc = markdown_to_adf("- а\n\nтекст\n\n- б").unwrap();
        assert_eq!(doc.content.len(), 3, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "bulletList");
        assert_eq!(doc.content[1].node_type, "paragraph");
        assert_eq!(doc.content[2].node_type, "bulletList");
    }

    /// The loose-list rule lives in the list loop, so a nested loose list
    /// fuses inside its own item without reaching across the item boundary
    /// to the following top-level item.
    #[test]
    fn nested_loose_list_merges_inside_list_item() {
        let md = "1. Родитель:\n    1. А\n\n    2. Б\n2. Следующий";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content.len(), 1, "blocks: {:?}", doc.content);
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2, "items: {items:?}");
        assert_eq!(item_text(&items[0]), "Родитель:");
        assert_eq!(item_text(&items[1]), "Следующий");
        let first_children = items[0].content.as_ref().unwrap();
        assert_eq!(first_children.len(), 2, "children: {first_children:?}");
        assert_eq!(first_children[1].node_type, "orderedList");
        let nested = first_children[1].content.as_ref().unwrap();
        assert_eq!(nested.len(), 2, "nested items: {nested:?}");
        assert_eq!(item_text(&nested[0]), "А");
        assert_eq!(item_text(&nested[1]), "Б");
    }

    /// The `{list=separate}` marker sits on the list that ends.
    #[test]
    fn list_separate_marker_keeps_lists_separate() {
        let doc = markdown_to_adf("- а\n{list=separate}\n\n- б").unwrap();
        assert_eq!(doc.content.len(), 2, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "bulletList");
        assert_eq!(doc.content[1].node_type, "bulletList");
        assert!(doc.content[0].attrs.is_none(), "{:?}", doc.content[0].attrs);
        assert!(doc.content[1].attrs.is_none(), "{:?}", doc.content[1].attrs);
        assert_eq!(item_text(&doc.content[0].content.as_ref().unwrap()[0]), "а");
        assert_eq!(item_text(&doc.content[1].content.as_ref().unwrap()[0]), "б");
    }

    /// The marker carries no ADF meaning, but it must still be consumed so
    /// it never shows up as a literal paragraph.
    #[test]
    fn list_separate_line_is_consumed_not_a_paragraph() {
        for md in [
            "- а\n{list=separate}\n\n- б",
            "1. а\n{list=separate}\n\n1. б",
            "- [ ] а\n{list=separate}\n\n- [ ] б",
        ] {
            let doc = markdown_to_adf(md).unwrap();
            assert!(
                doc.content.iter().all(|n| n.node_type != "paragraph"),
                "stray paragraph for {md:?}: {:?}",
                doc.content
            );
            let json = serde_json::to_string(&doc).unwrap();
            assert!(!json.contains("list=separate"), "leaked for {md:?}: {json}");
        }
    }

    /// Any trailing attrs line ends a list — that, not a transient marker,
    /// is what keeps two lists apart.  The attrs belong to the first list
    /// alone and must not be inherited by the second.
    #[test]
    fn block_attrs_line_ends_a_list() {
        let doc = markdown_to_adf("- a\n{align=center}\n- b").unwrap();
        assert_eq!(doc.content.len(), 2, "blocks: {:?}", doc.content);
        assert_eq!(doc.content[0].node_type, "bulletList");
        assert_eq!(doc.content[1].node_type, "bulletList");
        assert!(doc.content[0].marks.is_some(), "{:?}", doc.content[0]);
        assert!(doc.content[1].marks.is_none(), "{:?}", doc.content[1]);
    }

    /// The same, for `localId`: neither list's id may be lost.
    #[test]
    fn local_id_attrs_line_ends_a_list_keeping_both_ids() {
        let doc = markdown_to_adf("- a\n{localId=L1}\n- b\n{localId=L2}").unwrap();
        assert_eq!(doc.content.len(), 2, "blocks: {:?}", doc.content);
        assert_eq!(
            doc.content[0].attrs.as_ref().and_then(|a| a.get("localId")),
            Some(&serde_json::json!("L1"))
        );
        assert_eq!(
            doc.content[1].attrs.as_ref().and_then(|a| a.get("localId")),
            Some(&serde_json::json!("L2"))
        );
    }

    /// `{order=1}` (issue #547) ends the list like any other attrs line, so
    /// the numbering that follows starts a second list even though it would
    /// otherwise have continued.
    #[test]
    fn explicit_order_one_attrs_line_ends_a_list() {
        let doc = markdown_to_adf("1. a\n{order=1}\n\n2. b").unwrap();
        assert_eq!(doc.content.len(), 2, "blocks: {:?}", doc.content);
        assert_eq!(
            doc.content[0].attrs.as_ref().and_then(|a| a.get("order")),
            Some(&serde_json::json!(1))
        );
        assert_eq!(
            doc.content[1].attrs.as_ref().and_then(|a| a.get("order")),
            Some(&serde_json::json!(2))
        );
    }

    /// Two genuinely separate ADF `bulletList`s survive the round trip.
    #[test]
    fn round_trip_adjacent_bullet_lists() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[
                {"type":"bulletList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]}
                ]},
                {"type":"bulletList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"b"}]}]}
                ]}
            ]}"#,
            "- a\n{list=separate}\n\n- b\n",
        );
    }

    /// Two separate `orderedList`s whose numbering would have continued.
    #[test]
    fn round_trip_adjacent_ordered_lists() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[
                {"type":"orderedList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]},
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"b"}]}]}
                ]},
                {"type":"orderedList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"c"}]}]}
                ]}
            ]}"#,
            "1. a\n2. b\n{list=separate}\n\n1. c\n",
        );
    }

    /// The second list's `order` rides the list marker, but `3.` is exactly
    /// where the first list's numbering would have carried on — so the
    /// marker is still needed.
    #[test]
    fn round_trip_adjacent_ordered_lists_with_explicit_order() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[
                {"type":"orderedList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]},
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"b"}]}]}
                ]},
                {"type":"orderedList","attrs":{"order":3},"content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"c"}]}]}
                ]}
            ]}"#,
            "1. a\n2. b\n{list=separate}\n\n3. c\n",
        );
    }

    /// A restart the parser would never fuse needs no marker — emitting one
    /// would be pure churn.
    #[test]
    fn round_trip_adjacent_ordered_lists_restart_needs_no_marker() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[
                {"type":"orderedList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]},
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"b"}]}]}
                ]},
                {"type":"orderedList","attrs":{"order":5},"content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"c"}]}]}
                ]}
            ]}"#,
            "1. a\n2. b\n\n5. c\n",
        );
    }

    /// The issue #547 shape: `{order=1}` and `{list=separate}` compose onto
    /// one attrs line because both belong to the first list.
    #[test]
    fn round_trip_adjacent_ordered_lists_explicit_order_one() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[
                {"type":"orderedList","attrs":{"order":1},"content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]}
                ]},
                {"type":"orderedList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"b"}]}]}
                ]}
            ]}"#,
            "1. a\n{order=1 list=separate}\n\n1. b\n",
        );
    }

    /// Two adjacent lists *inside* a list item: the marker line is indented
    /// with the list it ends, and no blank line is needed because the attrs
    /// line is itself the terminator.
    #[test]
    fn round_trip_adjacent_bullet_lists_in_list_item() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[{"type":"bulletList","content":[
                {"type":"listItem","content":[
                    {"type":"paragraph","content":[{"type":"text","text":"p"}]},
                    {"type":"bulletList","content":[
                        {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"x"}]}]}
                    ]},
                    {"type":"bulletList","content":[
                        {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"y"}]}]}
                    ]}
                ]}
            ]}]}"#,
            "- p\n  - x\n  {list=separate}\n  - y\n",
        );
    }

    /// A `bulletList` followed by a `taskList` inside one item: without the
    /// marker `parse_bullet_list` flips the whole run to a task list and
    /// produces a `listItem` under a `taskList` — invalid ADF.
    #[test]
    fn round_trip_bullet_then_task_list_in_list_item() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[{"type":"bulletList","content":[
                {"type":"listItem","content":[
                    {"type":"paragraph","content":[{"type":"text","text":"x"}]},
                    {"type":"bulletList","content":[
                        {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"b"}]}]}
                    ]},
                    {"type":"taskList","attrs":{"localId":"l1"},"content":[
                        {"type":"taskItem","attrs":{"localId":"t1","state":"TODO"},"content":[{"type":"text","text":"t"}]}
                    ]}
                ]}
            ]}]}"#,
            "- x\n  - b\n  {list=separate}\n  - [ ] t {localId=t1}\n  {localId=l1}\n",
        );
    }

    /// The blockquote arm renders siblings itself, so it needs the marker
    /// too.
    #[test]
    fn round_trip_blockquote_adjacent_bullet_lists() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[{"type":"blockquote","content":[
                {"type":"bulletList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]}
                ]},
                {"type":"bulletList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"b"}]}]}
                ]}
            ]}]}"#,
            "> - a\n> {list=separate}\n> - b\n",
        );
    }

    /// The same, inside a table cell — whose empty `attrs` object survives.
    #[test]
    fn round_trip_adjacent_bullet_lists_in_table_cell() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[{"type":"table","content":[
                {"type":"tableRow","content":[
                    {"type":"tableCell","attrs":{},"content":[
                        {"type":"bulletList","content":[
                            {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]}
                        ]},
                        {"type":"bulletList","content":[
                            {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"b"}]}]}
                        ]}
                    ]}
                ]}
            ]}]}"#,
            "::::table\n:::tr\n:::td{}\n- a\n{list=separate}\n\n- b\n:::\n:::\n::::\n",
        );
    }

    /// Adjacent task lists now fuse too, so they need the marker — which
    /// composes onto the `taskList`'s own `{localId=…}` line.
    #[test]
    fn round_trip_adjacent_task_lists() {
        assert_round_trip(
        r#"{"type":"doc","version":1,"content":[
                {"type":"taskList","attrs":{"localId":"l1"},"content":[
                    {"type":"taskItem","attrs":{"localId":"t1","state":"TODO"},"content":[{"type":"text","text":"a"}]}
                ]},
                {"type":"taskList","attrs":{"localId":"l2"},"content":[
                    {"type":"taskItem","attrs":{"localId":"t2","state":"TODO"},"content":[{"type":"text","text":"b"}]}
                ]}
            ]}"#,
        "- [ ] a {localId=t1}\n{localId=l1 list=separate}\n\n- [ ] b {localId=t2}\n{localId=l2}\n",
    );
    }

    /// Three in a row: every list but the last carries the marker.
    #[test]
    fn round_trip_three_adjacent_bullet_lists() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[
                {"type":"bulletList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]}
                ]},
                {"type":"bulletList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"b"}]}]}
                ]},
                {"type":"bulletList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"c"}]}]}
                ]}
            ]}"#,
            "- a\n{list=separate}\n\n- b\n{list=separate}\n\n- c\n",
        );
    }

    /// A list with no items renders nothing, so there is nothing to fuse
    /// with and no marker is emitted — a bare `{list=separate}` line would
    /// otherwise come back as a literal paragraph.
    #[test]
    fn empty_second_bullet_list_renders_without_a_marker() {
        let doc: AdfDocument = serde_json::from_str(
            r#"{"type":"doc","version":1,"content":[
                {"type":"bulletList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]}
                ]},
                {"type":"bulletList","content":[]}
            ]}"#,
        )
        .unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md, "- a\n\n");
        let reparsed = markdown_to_adf(&md).unwrap();
        assert_eq!(reparsed.content.len(), 1, "{:?}", reparsed.content);
        assert_eq!(reparsed.content[0].node_type, "bulletList");
    }

    /// A subtree preserved verbatim in an ```` ```adf-unsupported ```` block
    /// is never rewritten: its inner lists keep their shape and an attrs key
    /// that happens to look like an internal marker survives.
    #[test]
    fn adf_unsupported_subtree_round_trips_verbatim() {
        let doc: AdfDocument = serde_json::from_str(
            r#"{"type":"doc","version":1,"content":[
                {"type":"mysteryBlock","attrs":{"__list_separate":true},"content":[
                    {"type":"bulletList","content":[
                        {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]}
                    ]},
                    {"type":"bulletList","content":[
                        {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"b"}]}]}
                    ]}
                ]}
            ]}"#,
        )
        .unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(!md.contains("list=separate"), "md: {md}");
        let reparsed = markdown_to_adf(&md).unwrap();
        assert_eq!(
            serde_json::to_value(&reparsed).unwrap(),
            serde_json::to_value(&doc).unwrap(),
            "markdown was:\n{md}"
        );
    }

    /// A paragraph whose text starts with spaces must not be pulled into the
    /// list above it as indented sub-content (issue #1732).
    #[test]
    fn round_trip_paragraph_with_leading_spaces_after_list() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[
                {"type":"bulletList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]}
                ]},
                {"type":"paragraph","content":[{"type":"text","text":"  hello"}]}
            ]}"#,
            "- a\n\n::paragraph[  hello]\n",
        );
    }

    /// The same text starting with `#` would otherwise become a heading
    /// *inside* the list item.
    #[test]
    fn round_trip_paragraph_with_leading_hash_after_list() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[
                {"type":"bulletList","content":[
                    {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]}
                ]},
                {"type":"paragraph","content":[{"type":"text","text":"  # nope"}]}
            ]}"#,
            "- a\n\n::paragraph[  # nope]\n",
        );
    }

    #[test]
    fn leading_spaces_counts_ascii_spaces_only() {
        assert_eq!(leading_spaces(""), 0);
        assert_eq!(leading_spaces("- a"), 0);
        assert_eq!(leading_spaces("    - a"), 4);
        assert_eq!(leading_spaces("\t- a"), 0);
        assert_eq!(leading_spaces("\u{a0}- a"), 0);
        assert_eq!(leading_spaces("  \u{a0} - a"), 2);
    }

    /// Round-trip helper: ADF JSON → markdown → ADF must reproduce the
    /// original document exactly.
    fn assert_round_trip(json: &str, expected_md: &str) {
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md, expected_md);
        let doc2 = markdown_to_adf(&md).unwrap();
        assert_eq!(
            serde_json::to_value(&doc2).unwrap(),
            serde_json::to_value(&doc).unwrap(),
            "round trip changed the document; markdown was:\n{md}"
        );
    }

    #[test]
    fn round_trip_nested_list_siblings() {
        assert_round_trip(
            r#"{"type":"doc","version":1,"content":[{"type":"orderedList","content":[
                {"type":"listItem","content":[
                    {"type":"paragraph","content":[{"type":"text","text":"Родитель:"}]},
                    {"type":"orderedList","content":[
                        {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Пункт А"}]}]},
                        {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Пункт Б"}]}]}
                    ]}
                ]},
                {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Следующий"}]}]}
            ]}]}"#,
            "1. Родитель:\n  1. Пункт А\n  2. Пункт Б\n2. Следующий\n",
        );
    }

    /// Issue #402's rule is unchanged by #1727: a marker-shaped line at
    /// exactly the item's content indent after a hardBreak is continuation
    /// text, not a nested list — only a marker at *sibling* level ends the
    /// item.
    #[test]
    fn hardbreak_continuation_at_content_indent_is_still_text() {
        let md = "- first line  \n  2. continued\n- second";
        let doc = markdown_to_adf(md).unwrap();
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2, "items: {items:?}");
        let inlines = items[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(inlines[2].text.as_deref(), Some("2. continued"));
    }

    #[test]
    fn task_list() {
        let md = "- [ ] Todo item\n- [x] Done item";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "taskList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);
        assert_eq!(items[0].node_type, "taskItem");
        assert_eq!(items[0].attrs.as_ref().unwrap()["state"], "TODO");
        assert_eq!(items[1].attrs.as_ref().unwrap()["state"], "DONE");
    }

    #[test]
    fn task_list_uppercase_x() {
        let md = "- [X] Done item";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "taskList");
        let item = &doc.content[0].content.as_ref().unwrap()[0];
        assert_eq!(item.attrs.as_ref().unwrap()["state"], "DONE");
    }

    /// Issue #548: an empty task marker (no trailing space) must still be
    /// parsed as a `taskList` rather than a `bulletList` with `[ ]` text.
    #[test]
    fn task_list_empty_todo_no_trailing_space() {
        let md = "- [ ]";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "taskList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 1);
        assert_eq!(items[0].node_type, "taskItem");
        assert_eq!(items[0].attrs.as_ref().unwrap()["state"], "TODO");
        assert!(items[0].content.is_none());
    }

    /// Issue #548: likewise for a done checkbox with no body.
    #[test]
    fn task_list_empty_done_no_trailing_space() {
        let md = "- [x]\n- [X]";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "taskList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);
        assert_eq!(items[0].attrs.as_ref().unwrap()["state"], "DONE");
        assert_eq!(items[1].attrs.as_ref().unwrap()["state"], "DONE");
    }

    /// Issue #548: the body of `- [ ] text` must not have a spurious leading
    /// space introduced by relaxing the trailing-space requirement.
    #[test]
    fn task_list_body_has_no_leading_space() {
        let md = "- [ ] Buy groceries";
        let doc = markdown_to_adf(md).unwrap();
        let item = &doc.content[0].content.as_ref().unwrap()[0];
        let text = item.content.as_ref().unwrap()[0].text.as_deref().unwrap();
        assert_eq!(text, "Buy groceries");
    }

    /// Issue #548: round-trip from ADF with empty taskItems should preserve
    /// the `taskList` structure even if trailing spaces are stripped from the
    /// intermediate markdown (as many editors do).
    #[test]
    fn round_trip_empty_task_items_stripped_trailing_spaces() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": "abc"},
                "content": [
                    {"type": "taskItem", "attrs": {"localId": "def", "state": "TODO"}},
                    {"type": "taskItem", "attrs": {"localId": "ghi", "state": "DONE"}}
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let stripped: String = md.lines().map(str::trim_end).collect::<Vec<_>>().join("\n");
        let parsed = markdown_to_adf(&stripped).unwrap();
        assert_eq!(parsed.content[0].node_type, "taskList");
        let items = parsed.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);
        assert_eq!(items[0].node_type, "taskItem");
        assert_eq!(items[0].attrs.as_ref().unwrap()["state"], "TODO");
        assert_eq!(items[1].node_type, "taskItem");
        assert_eq!(items[1].attrs.as_ref().unwrap()["state"], "DONE");
    }

    #[test]
    fn try_parse_task_marker_accepts_bare_checkbox() {
        assert_eq!(try_parse_task_marker("[ ]"), Some(("TODO", "")));
        assert_eq!(try_parse_task_marker("[x]"), Some(("DONE", "")));
        assert_eq!(try_parse_task_marker("[X]"), Some(("DONE", "")));
        assert_eq!(try_parse_task_marker("[ ] foo"), Some(("TODO", "foo")));
        assert_eq!(try_parse_task_marker("[x] foo"), Some(("DONE", "foo")));
        assert_eq!(try_parse_task_marker("[ ]foo"), None);
        assert_eq!(try_parse_task_marker("[x]foo"), None);
        assert_eq!(try_parse_task_marker("[y] foo"), None);
    }

    #[test]
    fn starts_with_task_marker_matches_parser() {
        // Anything `try_parse_task_marker` recognises must also be flagged
        // here so the renderer escapes it.
        assert!(starts_with_task_marker("[ ]"));
        assert!(starts_with_task_marker("[x]"));
        assert!(starts_with_task_marker("[X]"));
        assert!(starts_with_task_marker("[ ] foo"));
        assert!(starts_with_task_marker("[x] foo\n"));
        assert!(starts_with_task_marker("[ ]\n"));
        // No collision when the bracket is followed by non-whitespace.
        assert!(!starts_with_task_marker("[ ]foo"));
        assert!(!starts_with_task_marker("[y] foo"));
        assert!(!starts_with_task_marker("foo [ ] bar"));
        assert!(!starts_with_task_marker(""));
    }

    /// Issue #548: a `bulletList` whose item starts with literal `[ ]` text
    /// must round-trip through markdown without being promoted to a
    /// `taskList`.
    #[test]
    fn round_trip_bullet_list_with_literal_checkbox_text() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "bulletList",
                "content": [{
                    "type": "listItem",
                    "content": [{
                        "type": "paragraph",
                        "content": [
                            {"type": "text", "text": "[ ] Review the "},
                            {"type": "text", "text": "config.yaml", "marks": [{"type": "code"}]},
                            {"type": "text", "text": " file"}
                        ]
                    }]
                }]
            }]
        }"#;
        let original: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&original).unwrap();
        // Renderer must escape the leading bracket.
        assert!(
            md.contains(r"- \[ ] Review the "),
            "rendered markdown: {md:?}"
        );
        let parsed = markdown_to_adf(&md).unwrap();
        assert_eq!(parsed.content[0].node_type, "bulletList");
        let item = &parsed.content[0].content.as_ref().unwrap()[0];
        assert_eq!(item.node_type, "listItem");
        let para = &item.content.as_ref().unwrap()[0];
        assert_eq!(para.node_type, "paragraph");
        let text_nodes = para.content.as_ref().unwrap();
        assert_eq!(text_nodes[0].text.as_deref().unwrap(), "[ ] Review the ");
        assert_eq!(text_nodes[1].text.as_deref().unwrap(), "config.yaml");
        assert_eq!(text_nodes[2].text.as_deref().unwrap(), " file");
    }

    /// Issue #548: the same problem with a `[x]` marker.
    #[test]
    fn round_trip_bullet_list_with_literal_done_checkbox_text() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "bulletList",
                "content": [{
                    "type": "listItem",
                    "content": [{
                        "type": "paragraph",
                        "content": [{"type": "text", "text": "[x] not actually done"}]
                    }]
                }]
            }]
        }"#;
        let original: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&original).unwrap();
        assert!(md.contains(r"- \[x] "), "rendered markdown: {md:?}");
        let parsed = markdown_to_adf(&md).unwrap();
        assert_eq!(parsed.content[0].node_type, "bulletList");
        let item = &parsed.content[0].content.as_ref().unwrap()[0];
        let para = &item.content.as_ref().unwrap()[0];
        let text = para.content.as_ref().unwrap()[0].text.as_deref().unwrap();
        assert_eq!(text, "[x] not actually done");
    }

    /// Issue #548: `bulletList` item whose entire content is literal `[ ]`.
    #[test]
    fn round_trip_bullet_list_with_bare_literal_checkbox() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "bulletList",
                "content": [{
                    "type": "listItem",
                    "content": [{
                        "type": "paragraph",
                        "content": [{"type": "text", "text": "[ ]"}]
                    }]
                }]
            }]
        }"#;
        let original: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&original).unwrap();
        let parsed = markdown_to_adf(&md).unwrap();
        assert_eq!(parsed.content[0].node_type, "bulletList");
        let item = &parsed.content[0].content.as_ref().unwrap()[0];
        let para = &item.content.as_ref().unwrap()[0];
        let text = para.content.as_ref().unwrap()[0].text.as_deref().unwrap();
        assert_eq!(text, "[ ]");
    }

    /// Issue #548: a `bulletList` with a non-task `[?]` prefix should not be
    /// escaped — that would just produce noise.
    #[test]
    fn bullet_list_non_task_bracket_text_not_escaped() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "bulletList",
                "content": [{
                    "type": "listItem",
                    "content": [{
                        "type": "paragraph",
                        "content": [{"type": "text", "text": "[?] unsure"}]
                    }]
                }]
            }]
        }"#;
        let original: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&original).unwrap();
        assert!(!md.contains(r"\["), "should not escape: {md:?}");
        assert!(md.contains("- [?] unsure"), "rendered: {md:?}");
    }

    /// Issue #548: nested `bulletList` items inside another `bulletList`
    /// must also have their literal `[ ]` text escaped.
    #[test]
    fn round_trip_nested_bullet_list_with_literal_checkbox_text() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "bulletList",
                "content": [{
                    "type": "listItem",
                    "content": [
                        {"type": "paragraph", "content": [{"type": "text", "text": "outer"}]},
                        {"type": "bulletList", "content": [{
                            "type": "listItem",
                            "content": [{
                                "type": "paragraph",
                                "content": [{"type": "text", "text": "[ ] inner literal"}]
                            }]
                        }]}
                    ]
                }]
            }]
        }"#;
        let original: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&original).unwrap();
        let parsed = markdown_to_adf(&md).unwrap();
        let outer = &parsed.content[0];
        assert_eq!(outer.node_type, "bulletList");
        let outer_item = &outer.content.as_ref().unwrap()[0];
        let inner_list = &outer_item.content.as_ref().unwrap()[1];
        assert_eq!(inner_list.node_type, "bulletList");
        let inner_item = &inner_list.content.as_ref().unwrap()[0];
        assert_eq!(inner_item.node_type, "listItem");
        let para = &inner_item.content.as_ref().unwrap()[0];
        let text = para.content.as_ref().unwrap()[0].text.as_deref().unwrap();
        assert_eq!(text, "[ ] inner literal");
    }

    #[test]
    fn adf_task_list_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::task_list(vec![
                AdfNode::task_item(
                    "TODO",
                    vec![AdfNode::paragraph(vec![AdfNode::text("Todo")])],
                ),
                AdfNode::task_item(
                    "DONE",
                    vec![AdfNode::paragraph(vec![AdfNode::text("Done")])],
                ),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("- [ ] Todo"));
        assert!(md.contains("- [x] Done"));
    }

    #[test]
    fn round_trip_task_list() {
        let md = "- [ ] Todo item\n- [x] Done item\n";
        let doc = markdown_to_adf(md).unwrap();
        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains("- [ ] Todo item"));
        assert!(result.contains("- [x] Done item"));
    }

    /// Issue #408: taskItem content with inline nodes directly (no paragraph wrapper).
    #[test]
    fn adf_task_item_unwrapped_inline_content() {
        // Real Confluence ADF: taskItem contains text nodes directly, no paragraph.
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": "list-001"},
                "content": [{
                    "type": "taskItem",
                    "attrs": {"localId": "task-001", "state": "TODO"},
                    "content": [{"type": "text", "text": "Do something"}]
                }]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("- [ ] Do something"), "got: {md}");
        assert!(!md.contains("adf-unsupported"), "got: {md}");
    }

    /// Issue #408: multiple taskItems with unwrapped inline content.
    #[test]
    fn adf_task_list_multiple_unwrapped_items() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": "list-001"},
                "content": [
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "task-001", "state": "TODO"},
                        "content": [{"type": "text", "text": "First task"}]
                    },
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "task-002", "state": "DONE"},
                        "content": [{"type": "text", "text": "Second task"}]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("- [ ] First task"), "got: {md}");
        assert!(md.contains("- [x] Second task"), "got: {md}");
        assert!(!md.contains("adf-unsupported"), "got: {md}");
    }

    /// Issue #408: unwrapped inline content with marks (bold text).
    #[test]
    fn adf_task_item_unwrapped_inline_with_marks() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": "list-001"},
                "content": [{
                    "type": "taskItem",
                    "attrs": {"localId": "task-001", "state": "TODO"},
                    "content": [
                        {"type": "text", "text": "Buy "},
                        {"type": "text", "text": "groceries", "marks": [{"type": "strong"}]},
                        {"type": "text", "text": " today"}
                    ]
                }]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("- [ ] Buy **groceries** today"), "got: {md}");
    }

    /// Issue #408: taskItem localId is preserved for unwrapped inline content.
    #[test]
    fn adf_task_item_unwrapped_preserves_local_id() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": "list-001"},
                "content": [{
                    "type": "taskItem",
                    "attrs": {"localId": "task-001", "state": "TODO"},
                    "content": [{"type": "text", "text": "Do something"}]
                }]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("{localId=task-001}"), "got: {md}");
        assert!(md.contains("{localId=list-001}"), "got: {md}");
    }

    /// Issue #408: round-trip from Confluence ADF with unwrapped taskItem content.
    #[test]
    fn round_trip_task_list_unwrapped_inline() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": "list-001"},
                "content": [
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "task-001", "state": "TODO"},
                        "content": [{"type": "text", "text": "Do something"}]
                    },
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "task-002", "state": "DONE"},
                        "content": [{"type": "text", "text": "Already done"}]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();

        // Round-trip: markdown back to ADF
        let doc2 = markdown_to_adf(&md).unwrap();
        assert_eq!(doc2.content[0].node_type, "taskList");

        let items = doc2.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);
        assert_eq!(items[0].attrs.as_ref().unwrap()["state"], "TODO");
        assert_eq!(items[1].attrs.as_ref().unwrap()["state"], "DONE");

        // localIds preserved
        assert_eq!(items[0].attrs.as_ref().unwrap()["localId"], "task-001");
        assert_eq!(items[1].attrs.as_ref().unwrap()["localId"], "task-002");
        assert_eq!(
            doc2.content[0].attrs.as_ref().unwrap()["localId"],
            "list-001"
        );
    }

    /// Issue #408: taskItem with inline content followed by a nested block (sub-list).
    #[test]
    fn adf_task_item_unwrapped_inline_then_block() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": "list-001"},
                "content": [{
                    "type": "taskItem",
                    "attrs": {"localId": "task-001", "state": "TODO"},
                    "content": [
                        {"type": "text", "text": "Parent task"},
                        {
                            "type": "bulletList",
                            "content": [{
                                "type": "listItem",
                                "content": [{
                                    "type": "paragraph",
                                    "content": [{"type": "text", "text": "sub-item"}]
                                }]
                            }]
                        }
                    ]
                }]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("- [ ] Parent task"), "got: {md}");
        assert!(md.contains("  - sub-item"), "got: {md}");
        assert!(!md.contains("adf-unsupported"), "got: {md}");
    }

    /// Issue #408: taskItem with empty content array renders without panic.
    #[test]
    fn adf_task_item_empty_content() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": "list-001"},
                "content": [{
                    "type": "taskItem",
                    "attrs": {"localId": "task-001", "state": "TODO"},
                    "content": []
                }]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("- [ ] "), "got: {md}");
        assert!(!md.contains("adf-unsupported"), "got: {md}");
    }

    /// Issue #489: nested taskItem inside taskItem.content renders as indented
    /// task items instead of corrupting the surrounding taskList.
    #[test]
    fn adf_nested_task_item_renders_without_corruption() {
        let json = r#"{
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "taskList",
                "attrs": {"localId": ""},
                "content": [
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "aabbccdd-1234-5678-abcd-aabbccdd1234", "state": "TODO"},
                        "content": [{"type": "text", "text": "Normal task"}]
                    },
                    {
                        "type": "taskItem",
                        "attrs": {"localId": ""},
                        "content": [
                            {
                                "type": "taskItem",
                                "attrs": {"localId": "bbccddee-2345-6789-bcde-bbccddee2345", "state": "TODO"},
                                "content": [{"type": "text", "text": "Nested task one"}]
                            },
                            {
                                "type": "taskItem",
                                "attrs": {"localId": "ccddee11-3456-7890-cdef-ccddee113456", "state": "DONE"},
                                "content": [{"type": "text", "text": "Nested task two"}]
                            }
                        ]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // Normal task preserved
        assert!(md.contains("- [ ] Normal task"), "got: {md}");
        // Nested tasks rendered as indented task items, not adf-unsupported
        assert!(!md.contains("adf-unsupported"), "got: {md}");
        assert!(md.contains("  - [ ] Nested task one"), "got: {md}");
        assert!(md.contains("  - [x] Nested task two"), "got: {md}");
    }

    /// Issue #489: round-trip of nested taskItem preserves data.
    #[test]
    fn round_trip_nested_task_item() {
        let json = r#"{
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "taskList",
                "attrs": {"localId": ""},
                "content": [
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "task-001", "state": "TODO"},
                        "content": [{"type": "text", "text": "Normal task"}]
                    },
                    {
                        "type": "taskItem",
                        "attrs": {"localId": ""},
                        "content": [
                            {
                                "type": "taskItem",
                                "attrs": {"localId": "task-002", "state": "TODO"},
                                "content": [{"type": "text", "text": "Nested one"}]
                            },
                            {
                                "type": "taskItem",
                                "attrs": {"localId": "task-003", "state": "DONE"},
                                "content": [{"type": "text", "text": "Nested two"}]
                            }
                        ]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let doc2 = markdown_to_adf(&md).unwrap();

        // Top-level structure: taskList with 2 items
        assert_eq!(doc2.content[0].node_type, "taskList");
        let items = doc2.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2, "expected 2 top-level items, got: {items:?}");

        // First item: normal task preserved
        assert_eq!(items[0].attrs.as_ref().unwrap()["state"], "TODO");
        assert_eq!(items[0].attrs.as_ref().unwrap()["localId"], "task-001");
        let first_content = items[0].content.as_ref().unwrap();
        assert_eq!(first_content[0].text.as_deref(), Some("Normal task"));

        // Second item: container taskItem — no spurious `state` attr
        let container = &items[1];
        assert_eq!(container.node_type, "taskItem");
        let c_attrs = container.attrs.as_ref().unwrap();
        assert!(
            c_attrs.get("state").is_none(),
            "container should have no state attr, got: {c_attrs:?}"
        );

        // Children are bare taskItems, NOT wrapped in a taskList
        let container_content = container.content.as_ref().unwrap();
        assert_eq!(
            container_content.len(),
            2,
            "expected 2 bare taskItem children"
        );
        assert_eq!(container_content[0].node_type, "taskItem");
        assert_eq!(
            container_content[0].attrs.as_ref().unwrap()["state"],
            "TODO"
        );
        assert_eq!(
            container_content[0].attrs.as_ref().unwrap()["localId"],
            "task-002"
        );
        assert_eq!(container_content[1].node_type, "taskItem");
        assert_eq!(
            container_content[1].attrs.as_ref().unwrap()["state"],
            "DONE"
        );
        assert_eq!(
            container_content[1].attrs.as_ref().unwrap()["localId"],
            "task-003"
        );
    }

    /// Issue #489: nested taskItem with localIds on both container and children.
    #[test]
    fn adf_nested_task_item_preserves_local_ids() {
        let json = r#"{
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "taskList",
                "attrs": {"localId": "list-001"},
                "content": [{
                    "type": "taskItem",
                    "attrs": {"localId": "container-001", "state": "TODO"},
                    "content": [{
                        "type": "taskItem",
                        "attrs": {"localId": "child-001", "state": "DONE"},
                        "content": [{"type": "text", "text": "Nested child"}]
                    }]
                }]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // Container localId is emitted
        assert!(
            md.contains("localId=container-001"),
            "container localId missing: {md}"
        );
        // Child localId is emitted
        assert!(
            md.contains("localId=child-001"),
            "child localId missing: {md}"
        );
        assert!(!md.contains("adf-unsupported"), "got: {md}");
    }

    /// Issue #489: nested taskItem content mixed with a non-taskItem block node.
    /// Covers the else branch in the renderer where a child is not a taskItem.
    #[test]
    fn adf_nested_task_item_mixed_with_block_node() {
        let json = r#"{
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "taskList",
                "attrs": {"localId": ""},
                "content": [{
                    "type": "taskItem",
                    "attrs": {"localId": "", "state": "TODO"},
                    "content": [
                        {
                            "type": "taskItem",
                            "attrs": {"localId": "", "state": "TODO"},
                            "content": [{"type": "text", "text": "A nested task"}]
                        },
                        {
                            "type": "paragraph",
                            "content": [{"type": "text", "text": "Stray paragraph"}]
                        }
                    ]
                }]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("  - [ ] A nested task"), "got: {md}");
        assert!(md.contains("  Stray paragraph"), "got: {md}");
        assert!(!md.contains("adf-unsupported"), "got: {md}");
    }

    /// Issue #489: task item with inline text AND indented sub-content.
    /// Covers the parser's `Some` branch when appending nested blocks to
    /// an existing content vec.
    #[test]
    fn task_item_with_text_and_nested_sub_content() {
        let md = "- [ ] Parent task\n  - [ ] Sub task\n";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "taskList");
        let items = doc.content[0].content.as_ref().unwrap();
        // Issue #506: the nested taskList is a sibling of the taskItem,
        // not a child — matching ADF's canonical structure.
        assert_eq!(items.len(), 2, "got: {items:?}");
        let parent = &items[0];
        assert_eq!(parent.attrs.as_ref().unwrap()["state"], "TODO");
        let parent_content = parent.content.as_ref().unwrap();
        assert_eq!(parent_content[0].text.as_deref(), Some("Parent task"));
        // Second item: nested taskList (sibling)
        assert_eq!(items[1].node_type, "taskList");
        let nested = items[1].content.as_ref().unwrap();
        assert_eq!(nested.len(), 1);
        assert_eq!(nested[0].attrs.as_ref().unwrap()["state"], "TODO");
    }

    /// Issue #489: empty task item with non-taskList sub-content (e.g. a
    /// paragraph).  Exercises the `None` branch when the sub-content does
    /// not qualify for container-unwrap.
    #[test]
    fn task_item_empty_with_non_tasklist_sub_content() {
        let md = "- [ ] \n  Some paragraph text\n";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "taskList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 1);
        let item = &items[0];
        assert_eq!(item.attrs.as_ref().unwrap()["state"], "TODO");
        let content = item.content.as_ref().unwrap();
        // Sub-content is a paragraph (not unwrapped since it's not a taskList)
        assert_eq!(content[0].node_type, "paragraph");
    }

    /// Issue #489: single nested taskItem (edge case — only one child).
    #[test]
    fn adf_nested_task_item_single_child() {
        let json = r#"{
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "taskList",
                "attrs": {"localId": ""},
                "content": [{
                    "type": "taskItem",
                    "attrs": {"localId": "", "state": "TODO"},
                    "content": [{
                        "type": "taskItem",
                        "attrs": {"localId": "", "state": "DONE"},
                        "content": [{"type": "text", "text": "Only child"}]
                    }]
                }]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("  - [x] Only child"), "got: {md}");
        assert!(!md.contains("adf-unsupported"), "got: {md}");
    }

    /// Issue #506: nested taskList as direct child of outer taskList is
    /// rendered indented so it round-trips back as taskList, not taskItem.
    #[test]
    fn adf_nested_tasklist_sibling_renders_indented() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": ""},
                "content": [
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "aabbccdd-1234-5678-abcd-000000000001", "state": "TODO"},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "parent task one"}]}]
                    },
                    {
                        "type": "taskList",
                        "attrs": {"localId": ""},
                        "content": [{
                            "type": "taskItem",
                            "attrs": {"localId": "aabbccdd-1234-5678-abcd-000000000002", "state": "TODO"},
                            "content": [{"type": "paragraph", "content": [{"type": "text", "text": "nested sub-task"}]}]
                        }]
                    },
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "aabbccdd-1234-5678-abcd-000000000003", "state": "TODO"},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "parent task two"}]}]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // The nested taskList should be indented under the preceding item.
        assert!(md.contains("- [ ] parent task one"), "got: {md}");
        assert!(md.contains("  - [ ] nested sub-task"), "got: {md}");
        assert!(md.contains("- [ ] parent task two"), "got: {md}");
    }

    /// Issue #506: round-trip preserves nested taskList type.
    #[test]
    fn round_trip_nested_tasklist_preserves_type() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": ""},
                "content": [
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "", "state": "TODO"},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "parent task one"}]}]
                    },
                    {
                        "type": "taskList",
                        "attrs": {"localId": ""},
                        "content": [{
                            "type": "taskItem",
                            "attrs": {"localId": "", "state": "TODO"},
                            "content": [{"type": "paragraph", "content": [{"type": "text", "text": "nested sub-task"}]}]
                        }]
                    },
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "", "state": "TODO"},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "parent task two"}]}]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt_doc = markdown_to_adf(&md).unwrap();
        // The outer taskList should still be present.
        assert_eq!(rt_doc.content[0].node_type, "taskList");
        let items = rt_doc.content[0].content.as_ref().unwrap();
        // The nested taskList is a sibling of the taskItem nodes,
        // matching the original ADF structure (issue #506).
        assert_eq!(items.len(), 3, "got: {items:?}");
        assert_eq!(items[0].node_type, "taskItem");
        assert_eq!(
            items[1].node_type, "taskList",
            "nested taskList should survive round-trip"
        );
        assert_eq!(items[2].node_type, "taskItem");
        let nested_items = items[1].content.as_ref().unwrap();
        assert_eq!(nested_items[0].attrs.as_ref().unwrap()["state"], "TODO");
    }

    /// Issue #506: nested taskList with DONE state preserves checkbox.
    #[test]
    fn adf_nested_tasklist_done_state() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": ""},
                "content": [
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "", "state": "TODO"},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "parent"}]}]
                    },
                    {
                        "type": "taskList",
                        "attrs": {"localId": ""},
                        "content": [{
                            "type": "taskItem",
                            "attrs": {"localId": "", "state": "DONE"},
                            "content": [{"type": "paragraph", "content": [{"type": "text", "text": "done child"}]}]
                        }]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("  - [x] done child"), "got: {md}");
        // Round-trip preserves DONE state — nested taskList is a sibling.
        let rt_doc = markdown_to_adf(&md).unwrap();
        let items = rt_doc.content[0].content.as_ref().unwrap();
        assert_eq!(
            items[1].node_type, "taskList",
            "nested taskList should survive round-trip"
        );
        let nested_item = &items[1].content.as_ref().unwrap()[0];
        assert_eq!(nested_item.attrs.as_ref().unwrap()["state"], "DONE");
    }

    /// Issue #506: multiple nested taskLists at the same level.
    #[test]
    fn adf_multiple_nested_tasklists() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": ""},
                "content": [
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "", "state": "TODO"},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "first parent"}]}]
                    },
                    {
                        "type": "taskList",
                        "attrs": {"localId": ""},
                        "content": [{
                            "type": "taskItem",
                            "attrs": {"localId": "", "state": "TODO"},
                            "content": [{"type": "paragraph", "content": [{"type": "text", "text": "child A"}]}]
                        }]
                    },
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "", "state": "TODO"},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "second parent"}]}]
                    },
                    {
                        "type": "taskList",
                        "attrs": {"localId": ""},
                        "content": [{
                            "type": "taskItem",
                            "attrs": {"localId": "", "state": "DONE"},
                            "content": [{"type": "paragraph", "content": [{"type": "text", "text": "child B"}]}]
                        }]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("- [ ] first parent"), "got: {md}");
        assert!(md.contains("  - [ ] child A"), "got: {md}");
        assert!(md.contains("- [ ] second parent"), "got: {md}");
        assert!(md.contains("  - [x] child B"), "got: {md}");
    }

    /// Issue #506: second round-trip is stable (idempotent after first
    /// structural normalisation).
    #[test]
    fn round_trip_nested_tasklist_stable() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "taskList",
                "attrs": {"localId": ""},
                "content": [
                    {
                        "type": "taskItem",
                        "attrs": {"localId": "", "state": "TODO"},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "parent"}]}]
                    },
                    {
                        "type": "taskList",
                        "attrs": {"localId": ""},
                        "content": [{
                            "type": "taskItem",
                            "attrs": {"localId": "", "state": "TODO"},
                            "content": [{"type": "paragraph", "content": [{"type": "text", "text": "child"}]}]
                        }]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        // First round-trip.
        let md1 = adf_to_markdown(&doc).unwrap();
        let rt1 = markdown_to_adf(&md1).unwrap();
        // Second round-trip.
        let md2 = adf_to_markdown(&rt1).unwrap();
        let rt2 = markdown_to_adf(&md2).unwrap();
        // Markdown output should be identical after first normalisation.
        assert_eq!(md1, md2, "markdown should be stable across round-trips");
        // ADF structure should also be stable.
        let rt1_json = serde_json::to_string(&rt1).unwrap();
        let rt2_json = serde_json::to_string(&rt2).unwrap();
        assert_eq!(
            rt1_json, rt2_json,
            "ADF should be stable across round-trips"
        );
    }

    /// Issue #506: task item with text and mixed indented sub-content
    /// (taskList + non-taskList block).  Exercises the `child_nodes` branch
    /// where non-taskList blocks stay as children of the taskItem while
    /// taskLists are promoted to siblings.
    #[test]
    fn task_item_mixed_sub_content_splits_siblings() {
        let md = "- [ ] Parent task\n  - [ ] Sub task\n  Some paragraph\n";
        let doc = markdown_to_adf(md).unwrap();
        let items = doc.content[0].content.as_ref().unwrap();
        // taskItem + sibling taskList
        assert_eq!(items.len(), 2, "got: {items:?}");
        assert_eq!(items[0].node_type, "taskItem");
        let parent_content = items[0].content.as_ref().unwrap();
        // Inline text + paragraph block (the non-taskList sub-content)
        assert!(
            parent_content.iter().any(|n| n.node_type == "paragraph"),
            "non-taskList sub-content should stay as child: {parent_content:?}"
        );
        // Sibling taskList
        assert_eq!(items[1].node_type, "taskList");
    }

    /// Issue #506: empty task item with mixed indented sub-content hits the
    /// `None` arm of the `task.content` match when promoting taskLists to
    /// siblings.
    #[test]
    fn empty_task_item_mixed_sub_content_none_arm() {
        let md = "- [ ] \n  Some paragraph\n  - [ ] Sub task\n";
        let doc = markdown_to_adf(md).unwrap();
        let items = doc.content[0].content.as_ref().unwrap();
        // taskItem (with paragraph child) + sibling taskList
        assert_eq!(items.len(), 2, "got: {items:?}");
        assert_eq!(items[0].node_type, "taskItem");
        let parent_content = items[0].content.as_ref().unwrap();
        assert!(
            parent_content.iter().any(|n| n.node_type == "paragraph"),
            "paragraph should be assigned to taskItem: {parent_content:?}"
        );
        assert_eq!(items[1].node_type, "taskList");
    }

    /// Issue #506: task item with text and only non-taskList sub-content
    /// (no sibling taskLists).  Exercises the fall-through path where
    /// `sibling_task_lists` is empty and child_nodes are appended to
    /// the existing task content (Some arm).
    #[test]
    fn task_item_text_with_non_tasklist_sub_content_only() {
        let md = "- [ ] My task\n  Extra paragraph content\n";
        let doc = markdown_to_adf(md).unwrap();
        let items = doc.content[0].content.as_ref().unwrap();
        // Single taskItem — no sibling taskLists to extract.
        assert_eq!(items.len(), 1, "got: {items:?}");
        assert_eq!(items[0].node_type, "taskItem");
        let content = items[0].content.as_ref().unwrap();
        // Inline text + sub-paragraph
        assert!(
            content.iter().any(|n| n.node_type == "paragraph"),
            "paragraph sub-content should be a child of taskItem: {content:?}"
        );
    }

    /// Covers the else branch in render_list_item_content where the first
    /// child of a list item is a block node (not paragraph, not inline).
    #[test]
    fn adf_list_item_leading_block_node() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "bulletList",
                "content": [{
                    "type": "listItem",
                    "content": [{
                        "type": "codeBlock",
                        "attrs": {"language": "rust"},
                        "content": [{"type": "text", "text": "let x = 1;"}]
                    }]
                }]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("```rust"), "got: {md}");
        assert!(md.contains("let x = 1;"), "got: {md}");
        // Continuation lines must be indented so the block stays inside
        // the list item on round-trip (issue #511).
        for line in md.lines() {
            if line.starts_with("- ") {
                continue; // first line with list marker
            }
            if line.trim().is_empty() {
                continue;
            }
            assert!(
                line.starts_with("  "),
                "continuation line not indented: {line:?}"
            );
        }
    }

    /// Round-trip a codeBlock inside a listItem whose content contains a
    /// backtick character — the exact reproducer from issue #511.
    #[test]
    fn code_block_in_list_item_backtick_roundtrip() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "bulletList",
                "content": [{
                    "type": "listItem",
                    "content": [{
                        "type": "codeBlock",
                        "attrs": {"language": ""},
                        "content": [{"type": "text", "text": "error: some value with a backtick ` at end"}]
                    }]
                }]
            }]
        }"#;
        let original: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&original).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();
        let list = &roundtripped.content[0];
        assert_eq!(list.node_type, "bulletList", "top node: {}", list.node_type);
        let item = &list.content.as_ref().unwrap()[0];
        let first_child = &item.content.as_ref().unwrap()[0];
        assert_eq!(
            first_child.node_type, "codeBlock",
            "expected codeBlock, got: {}",
            first_child.node_type
        );
        let text = first_child.content.as_ref().unwrap()[0]
            .text
            .as_deref()
            .unwrap();
        assert_eq!(text, "error: some value with a backtick ` at end");
    }

    /// Code block with language tag inside a list item round-trips.
    #[test]
    fn code_block_with_language_in_list_item_roundtrip() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "bulletList",
                "content": [{
                    "type": "listItem",
                    "content": [{
                        "type": "codeBlock",
                        "attrs": {"language": "rust"},
                        "content": [{"type": "text", "text": "fn main() {\n    println!(\"hello\");\n}"}]
                    }]
                }]
            }]
        }"#;
        let original: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&original).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();
        let item = &roundtripped.content[0].content.as_ref().unwrap()[0];
        let code = &item.content.as_ref().unwrap()[0];
        assert_eq!(code.node_type, "codeBlock");
        let lang = code
            .attrs
            .as_ref()
            .and_then(|a| a.get("language"))
            .and_then(serde_json::Value::as_str)
            .unwrap_or("");
        assert_eq!(lang, "rust");
        let text = code.content.as_ref().unwrap()[0].text.as_deref().unwrap();
        assert!(text.contains("println!"), "code content: {text}");
    }

    /// Code block in an ordered list item round-trips correctly.
    #[test]
    fn code_block_in_ordered_list_item_roundtrip() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "orderedList",
                "attrs": {"order": 1},
                "content": [{
                    "type": "listItem",
                    "content": [{
                        "type": "codeBlock",
                        "attrs": {"language": ""},
                        "content": [{"type": "text", "text": "backtick ` here"}]
                    }]
                }]
            }]
        }"#;
        let original: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&original).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();
        let list = &roundtripped.content[0];
        assert_eq!(list.node_type, "orderedList");
        let item = &list.content.as_ref().unwrap()[0];
        let code = &item.content.as_ref().unwrap()[0];
        assert_eq!(code.node_type, "codeBlock");
        let text = code.content.as_ref().unwrap()[0].text.as_deref().unwrap();
        assert_eq!(text, "backtick ` here");
    }

    /// A list item with a code block followed by a paragraph round-trips.
    #[test]
    fn code_block_then_paragraph_in_list_item() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "bulletList",
                "content": [{
                    "type": "listItem",
                    "content": [
                        {
                            "type": "codeBlock",
                            "attrs": {"language": ""},
                            "content": [{"type": "text", "text": "code with ` backtick"}]
                        },
                        {
                            "type": "paragraph",
                            "content": [{"type": "text", "text": "description"}]
                        }
                    ]
                }]
            }]
        }"#;
        let original: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&original).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();
        let item = &roundtripped.content[0].content.as_ref().unwrap()[0];
        let children = item.content.as_ref().unwrap();
        assert_eq!(children[0].node_type, "codeBlock");
        assert_eq!(children[1].node_type, "paragraph");
    }

    /// Multiple backticks in code block content round-trip.
    #[test]
    fn code_block_multiple_backticks_in_list_item() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "bulletList",
                "content": [{
                    "type": "listItem",
                    "content": [{
                        "type": "codeBlock",
                        "attrs": {"language": ""},
                        "content": [{"type": "text", "text": "a ` b `` c ``` d"}]
                    }]
                }]
            }]
        }"#;
        let original: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&original).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();
        let item = &roundtripped.content[0].content.as_ref().unwrap()[0];
        let code = &item.content.as_ref().unwrap()[0];
        assert_eq!(code.node_type, "codeBlock");
        let text = code.content.as_ref().unwrap()[0].text.as_deref().unwrap();
        assert_eq!(text, "a ` b `` c ``` d");
    }

    /// Media as the first child of a list item with a subsequent paragraph
    /// exercises the media + sub_lines branch in `parse_list_item_first_line`.
    #[test]
    fn media_first_child_with_sub_content_in_list_item() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[
            {"type":"mediaSingle","attrs":{"layout":"center"},
             "content":[{"type":"media","attrs":{"type":"file","id":"img-99","collection":"col-x","height":50,"width":100}}]},
            {"type":"paragraph","content":[{"type":"text","text":"Caption below"}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let children = item.content.as_ref().unwrap();
        assert_eq!(
            children.len(),
            2,
            "expected 2 children, got {}",
            children.len()
        );
        assert_eq!(children[0].node_type, "mediaSingle");
        let media = &children[0].content.as_ref().unwrap()[0];
        assert_eq!(media.attrs.as_ref().unwrap()["id"], "img-99");
        assert_eq!(children[1].node_type, "paragraph");
    }

    #[test]
    fn inline_bold() {
        let doc = markdown_to_adf("Some **bold** text").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert!(content.len() >= 3);
        let bold_node = &content[1];
        assert_eq!(bold_node.text.as_deref(), Some("bold"));
        let marks = bold_node.marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "strong");
    }

    #[test]
    fn inline_italic() {
        let doc = markdown_to_adf("Some *italic* text").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        let italic_node = &content[1];
        assert_eq!(italic_node.text.as_deref(), Some("italic"));
        let marks = italic_node.marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "em");
    }

    #[test]
    fn inline_code() {
        let doc = markdown_to_adf("Use `code` here").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        let code_node = &content[1];
        assert_eq!(code_node.text.as_deref(), Some("code"));
        let marks = code_node.marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "code");
    }

    /// Issue #578: a code-marked text with an internal backtick must be
    /// emitted using double-backtick delimiters so it round-trips as a
    /// single node rather than being split on the inner backtick.
    #[test]
    fn inline_code_with_backtick_emitted_with_double_delimiters() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![
                AdfNode::text("Run "),
                AdfNode::text_with_marks(
                    "ADD `custom_threshold` TEXT NOT NULL",
                    vec![AdfMark::code()],
                ),
                AdfNode::text(" to update the schema."),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("``ADD `custom_threshold` TEXT NOT NULL``"),
            "expected double-backtick delimiters, got: {md}"
        );
    }

    /// Issue #578: double-backtick delimited code spans parse as a single
    /// code-marked text node that preserves the embedded single backticks.
    #[test]
    fn inline_code_double_backtick_delimiters_parse() {
        let doc = markdown_to_adf("Run ``ADD `custom_threshold` TEXT NOT NULL`` now").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 3, "content: {content:?}");
        let code_node = &content[1];
        assert_eq!(
            code_node.text.as_deref(),
            Some("ADD `custom_threshold` TEXT NOT NULL")
        );
        let marks = code_node.marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "code");
    }

    /// Issue #578: the full reproducer — a code-marked text with inner
    /// backticks survives ADF → JFM → ADF round-trip intact.
    #[test]
    fn inline_code_with_backtick_roundtrip() {
        let json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [
                    {"type": "text", "text": "Run "},
                    {
                        "type": "text",
                        "text": "ADD `custom_threshold` TEXT NOT NULL",
                        "marks": [{"type": "code"}]
                    },
                    {"type": "text", "text": " to update the schema."}
                ]
            }]
        }"#;
        let original: AdfDocument = serde_json::from_str(json).unwrap();
        let md = adf_to_markdown(&original).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();
        let para = &roundtripped.content[0];
        let children = para.content.as_ref().unwrap();
        assert_eq!(children.len(), 3, "expected 3 children, got: {children:?}");
        assert_eq!(children[0].text.as_deref(), Some("Run "));
        assert_eq!(
            children[1].text.as_deref(),
            Some("ADD `custom_threshold` TEXT NOT NULL")
        );
        let marks = children[1].marks.as_ref().unwrap();
        assert_eq!(marks.len(), 1);
        assert_eq!(marks[0].mark_type, "code");
        assert_eq!(children[2].text.as_deref(), Some(" to update the schema."));
    }

    /// A code-marked text containing a run of two backticks should be
    /// emitted with triple-backtick delimiters and round-trip intact —
    /// the first line of the paragraph also starts with the fence so this
    /// exercises the info-string-with-backtick fence-opener rejection.
    #[test]
    fn inline_code_with_double_backtick_roundtrip() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "x `` y",
                vec![AdfMark::code()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("x `` y"));
        let marks = content[0].marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "code");
    }

    /// A code-marked text that begins with a backtick must be padded on
    /// both sides so the CommonMark space-stripping rule reconstructs it.
    #[test]
    fn inline_code_leading_backtick_roundtrip() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "`start",
                vec![AdfMark::code()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some("`start"));
        assert_eq!(content[0].marks.as_ref().unwrap()[0].mark_type, "code");
    }

    /// A code-marked text that ends with a backtick must also survive.
    #[test]
    fn inline_code_trailing_backtick_roundtrip() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "end`",
                vec![AdfMark::code()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some("end`"));
    }

    /// Content that both begins and ends with a space (but is not all
    /// spaces) needs padding so the stripping rule leaves it intact.
    #[test]
    fn inline_code_space_padded_content_roundtrip() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                " foo ",
                vec![AdfMark::code()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some(" foo "));
    }

    /// All-space content must round-trip without the stripping rule
    /// kicking in (per CommonMark: all-space content is not stripped).
    #[test]
    fn inline_code_all_spaces_roundtrip() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "   ",
                vec![AdfMark::code()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some("   "));
    }

    /// A code+link mark where the code text contains a backtick must also
    /// round-trip — verifies the link branch of code-span rendering.
    #[test]
    fn inline_code_with_link_and_backtick_roundtrip() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "fn `inner`",
                vec![AdfMark::code(), AdfMark::link("https://example.com")],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("`` fn `inner` ``"),
            "expected padded double-backtick delimiters inside link, got: {md}"
        );
        let roundtripped = markdown_to_adf(&md).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some("fn `inner`"));
        let mark_types: Vec<&str> = content[0]
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert!(mark_types.contains(&"code"));
        assert!(mark_types.contains(&"link"));
    }

    /// Unmatched opening backticks must not be parsed as a code span.
    #[test]
    fn inline_code_unmatched_run_is_plain_text() {
        let doc = markdown_to_adf("foo ``bar baz").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("foo ``bar baz"));
        assert!(content[0].marks.is_none());
    }

    /// Mismatched delimiter lengths must not form a code span.  Per
    /// CommonMark the opening 2-backtick run and the trailing 1-backtick
    /// run never form a valid code span and the characters stay literal.
    #[test]
    fn inline_code_mismatched_delimiters_is_plain_text() {
        let doc = markdown_to_adf("``foo` bar").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("``foo` bar"));
        assert!(content[0].marks.is_none());
    }

    #[test]
    fn inline_code_delimiter_chooses_correct_length() {
        assert_eq!(inline_code_delimiter("no ticks"), (1, false));
        assert_eq!(inline_code_delimiter("one ` here"), (2, false));
        assert_eq!(inline_code_delimiter("two `` here"), (3, false));
        assert_eq!(inline_code_delimiter("three ``` here"), (4, false));
        assert_eq!(inline_code_delimiter("`leading"), (2, true));
        assert_eq!(inline_code_delimiter("trailing`"), (2, true));
        assert_eq!(inline_code_delimiter(" foo "), (1, true));
        assert_eq!(inline_code_delimiter(" "), (1, false));
        assert_eq!(inline_code_delimiter("   "), (1, false));
        assert_eq!(inline_code_delimiter(" foo"), (1, false));
    }

    #[test]
    fn try_parse_inline_code_strips_paired_spaces() {
        let (end, content) = try_parse_inline_code("`` `foo` ``", 0).unwrap();
        assert_eq!(end, 11);
        assert_eq!(content, "`foo`");
    }

    #[test]
    fn try_parse_inline_code_all_space_content_is_preserved() {
        let (_end, content) = try_parse_inline_code("`   `", 0).unwrap();
        assert_eq!(content, "   ");
    }

    #[test]
    fn try_parse_inline_code_single_run_matches_first_close() {
        let (end, content) = try_parse_inline_code("`foo` tail", 0).unwrap();
        assert_eq!(end, 5);
        assert_eq!(content, "foo");
    }

    #[test]
    fn try_parse_inline_code_no_match_returns_none() {
        assert!(try_parse_inline_code("``unmatched", 0).is_none());
        assert!(try_parse_inline_code("plain text", 0).is_none());
    }

    #[test]
    fn is_code_fence_opener_rejects_info_with_backtick() {
        assert!(is_code_fence_opener("```"));
        assert!(is_code_fence_opener("```rust"));
        assert!(is_code_fence_opener("```\"\""));
        assert!(!is_code_fence_opener("```x `` y```"));
        assert!(!is_code_fence_opener("``not-enough"));
        assert!(!is_code_fence_opener("no fence"));
    }

    #[test]
    fn inline_strikethrough() {
        let doc = markdown_to_adf("Some ~~deleted~~ text").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        let strike_node = &content[1];
        assert_eq!(strike_node.text.as_deref(), Some("deleted"));
        let marks = strike_node.marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "strike");
    }

    #[test]
    fn inline_link() {
        let doc = markdown_to_adf("Click [here](https://example.com) now").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        let link_node = &content[1];
        assert_eq!(link_node.text.as_deref(), Some("here"));
        let marks = link_node.marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "link");
    }

    #[test]
    fn block_image() {
        let md = "![Alt text](https://example.com/image.png)";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "mediaSingle");
    }

    #[test]
    fn table() {
        let md = "| A | B |\n| --- | --- |\n| 1 | 2 |";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "table");
        let rows = doc.content[0].content.as_ref().unwrap();
        assert_eq!(rows.len(), 2); // header + 1 body row
    }

    // ── adf_to_markdown tests ───────────────────────────────────────

    #[test]
    fn adf_paragraph_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text("Hello world")])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "Hello world");
    }

    #[test]
    fn adf_heading_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::heading(2, vec![AdfNode::text("Title")])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "## Title");
    }

    #[test]
    fn adf_bold_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![
                AdfNode::text("Normal "),
                AdfNode::text_with_marks("bold", vec![AdfMark::strong()]),
                AdfNode::text(" text"),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "Normal **bold** text");
    }

    #[test]
    fn adf_code_block_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::code_block(Some("rust"), "let x = 1;")],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("```rust"));
        assert!(md.contains("let x = 1;"));
        assert!(md.contains("```"));
    }

    #[test]
    fn adf_rule_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::rule()],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("---"));
    }

    #[test]
    fn adf_bullet_list_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::bullet_list(vec![
                AdfNode::list_item(vec![AdfNode::paragraph(vec![AdfNode::text("A")])]),
                AdfNode::list_item(vec![AdfNode::paragraph(vec![AdfNode::text("B")])]),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("- A"));
        assert!(md.contains("- B"));
    }

    #[test]
    fn adf_link_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "click",
                vec![AdfMark::link("https://example.com")],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "[click](https://example.com)");
    }

    #[test]
    fn unsupported_block_preserved_as_json() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode {
                node_type: "unknownBlock".to_string(),
                attrs: Some(serde_json::json!({"key": "value"})),
                content: None,
                text: None,
                marks: None,
                local_id: None,
                parameters: None,
            }],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("```adf-unsupported"));
        assert!(md.contains("\"unknownBlock\""));
    }

    #[test]
    fn unsupported_block_round_trips() {
        let original = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode {
                node_type: "unknownBlock".to_string(),
                attrs: Some(serde_json::json!({"key": "value"})),
                content: None,
                text: None,
                marks: None,
                local_id: None,
                parameters: None,
            }],
        };
        let md = adf_to_markdown(&original).unwrap();
        let restored = markdown_to_adf(&md).unwrap();
        assert_eq!(restored.content[0].node_type, "unknownBlock");
        assert_eq!(restored.content[0].attrs.as_ref().unwrap()["key"], "value");
    }

    // ── Round-trip tests ────────────────────────────────────────────

    #[test]
    fn round_trip_simple_document() {
        let md = "# Hello\n\nSome text with **bold** and *italic*.\n\n- Item 1\n- Item 2\n";
        let adf = markdown_to_adf(md).unwrap();
        let restored = adf_to_markdown(&adf).unwrap();

        assert!(restored.contains("# Hello"));
        assert!(restored.contains("**bold**"));
        assert!(restored.contains("*italic*"));
        assert!(restored.contains("- Item 1"));
        assert!(restored.contains("- Item 2"));
    }

    #[test]
    fn round_trip_code_block() {
        let md = "```python\nprint('hello')\n```\n";
        let adf = markdown_to_adf(md).unwrap();
        let restored = adf_to_markdown(&adf).unwrap();

        assert!(restored.contains("```python"));
        assert!(restored.contains("print('hello')"));
    }

    #[test]
    fn round_trip_code_block_no_attrs() {
        let adf_json = r#"{"version":1,"type":"doc","content":[
            {"type":"codeBlock","content":[{"type":"text","text":"plain code"}]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        assert!(doc.content[0].attrs.is_none());
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        assert!(round_tripped.content[0].attrs.is_none());
    }

    #[test]
    fn round_trip_code_block_empty_language() {
        let adf_json = r#"{"version":1,"type":"doc","content":[
            {"type":"codeBlock","attrs":{"language":""},"content":[{"type":"text","text":"simple code block no backtick"}]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let attrs = doc.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["language"], "");
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let rt_attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(rt_attrs["language"], "");
    }

    #[test]
    fn round_trip_code_block_with_language() {
        let adf_json = r#"{"version":1,"type":"doc","content":[
            {"type":"codeBlock","attrs":{"language":"python"},"content":[{"type":"text","text":"print('hi')"}]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let rt_attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(rt_attrs["language"], "python");
    }

    #[test]
    fn multiple_paragraphs() {
        let md = "First paragraph.\n\nSecond paragraph.\n";
        let adf = markdown_to_adf(md).unwrap();
        assert_eq!(adf.content.len(), 2);
        assert_eq!(adf.content[0].node_type, "paragraph");
        assert_eq!(adf.content[1].node_type, "paragraph");
    }

    // ── Additional markdown_to_adf tests ───────────────────────────────

    #[test]
    fn horizontal_rule_underscores() {
        let doc = markdown_to_adf("___").unwrap();
        assert_eq!(doc.content[0].node_type, "rule");
    }

    #[test]
    fn not_a_horizontal_rule_too_short() {
        let doc = markdown_to_adf("--").unwrap();
        assert_eq!(doc.content[0].node_type, "paragraph");
    }

    #[test]
    fn bullet_list_star_marker() {
        let md = "* Apple\n* Banana";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "bulletList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);
    }

    #[test]
    fn bullet_list_plus_marker() {
        let md = "+ One\n+ Two";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "bulletList");
    }

    #[test]
    fn ordered_list_non_one_start() {
        let md = "5. Fifth\n6. Sixth";
        let doc = markdown_to_adf(md).unwrap();
        let node = &doc.content[0];
        assert_eq!(node.node_type, "orderedList");
        let attrs = node.attrs.as_ref().unwrap();
        assert_eq!(attrs["order"], 5);
    }

    #[test]
    fn ordered_list_start_at_one_omits_order_attr() {
        // Issue #547: order=1 is the default and must be omitted from attrs
        // so that ADF→JFM→ADF round-trip is byte-identical for the common
        // case where the source ADF has no attrs object on orderedList.
        let md = "1. First\n2. Second";
        let doc = markdown_to_adf(md).unwrap();
        let node = &doc.content[0];
        assert_eq!(node.node_type, "orderedList");
        assert!(
            node.attrs.is_none(),
            "attrs should be omitted when order=1, got: {:?}",
            node.attrs
        );
    }

    #[test]
    fn blockquote_bare_marker() {
        // ">" with no space after
        let md = ">quoted text";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "blockquote");
    }

    #[test]
    fn image_no_alt() {
        let md = "![](https://example.com/img.png)";
        let doc = markdown_to_adf(md).unwrap();
        let node = &doc.content[0];
        assert_eq!(node.node_type, "mediaSingle");
        // media child should have no alt attr
        let media = &node.content.as_ref().unwrap()[0];
        let attrs = media.attrs.as_ref().unwrap();
        assert!(attrs.get("alt").is_none());
    }

    #[test]
    fn image_with_alt() {
        let md = "![A photo](https://example.com/photo.jpg)";
        let doc = markdown_to_adf(md).unwrap();
        let media = &doc.content[0].content.as_ref().unwrap()[0];
        let attrs = media.attrs.as_ref().unwrap();
        assert_eq!(attrs["alt"], "A photo");
    }

    #[test]
    fn table_multi_body_rows() {
        let md = "| H1 | H2 |\n| --- | --- |\n| a | b |\n| c | d |";
        let doc = markdown_to_adf(md).unwrap();
        let rows = doc.content[0].content.as_ref().unwrap();
        assert_eq!(rows.len(), 3); // header + 2 body rows
                                   // First row cells are tableHeader
        let header_cells = rows[0].content.as_ref().unwrap();
        assert_eq!(header_cells[0].node_type, "tableHeader");
        // Body row cells are tableCell
        let body_cells = rows[1].content.as_ref().unwrap();
        assert_eq!(body_cells[0].node_type, "tableCell");
    }

    #[test]
    fn table_no_separator_is_not_table() {
        // Pipe characters without a separator row should not parse as table
        let md = "| not | a table |";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "paragraph");
    }

    #[test]
    fn inline_underscore_bold() {
        let doc = markdown_to_adf("Some __bold__ text").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        let bold_node = &content[1];
        assert_eq!(bold_node.text.as_deref(), Some("bold"));
        let marks = bold_node.marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "strong");
    }

    #[test]
    fn inline_underscore_italic() {
        let doc = markdown_to_adf("Some _italic_ text").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        let italic_node = &content[1];
        assert_eq!(italic_node.text.as_deref(), Some("italic"));
        let marks = italic_node.marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "em");
    }

    #[test]
    fn intraword_underscore_not_emphasis() {
        // Single intraword underscore pair: do_something_useful
        let doc = markdown_to_adf("call do_something_useful now").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should be a single text node");
        assert_eq!(
            content[0].text.as_deref(),
            Some("call do_something_useful now")
        );
        assert!(content[0].marks.is_none());
    }

    #[test]
    fn intraword_underscore_multiple() {
        // Multiple intraword underscores: a_b_c_d
        let doc = markdown_to_adf("use a_b_c_d here").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("use a_b_c_d here"));
        assert!(content[0].marks.is_none());
    }

    #[test]
    fn intraword_double_underscore_not_bold() {
        // Intraword double underscores: foo__bar__baz
        let doc = markdown_to_adf("foo__bar__baz").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("foo__bar__baz"));
        assert!(content[0].marks.is_none());
    }

    #[test]
    fn intraword_triple_underscore_not_bold_italic() {
        // Intraword triple underscores: x___y___z
        let doc = markdown_to_adf("x___y___z").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("x___y___z"));
        assert!(content[0].marks.is_none());
    }

    #[test]
    fn underscore_emphasis_still_works_with_spaces() {
        // Normal emphasis with spaces around delimiters should still work
        let doc = markdown_to_adf("some _italic_ here").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 3);
        assert_eq!(content[1].text.as_deref(), Some("italic"));
        let marks = content[1].marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "em");
    }

    #[test]
    fn underscore_bold_still_works_with_spaces() {
        // Normal bold with spaces around delimiters should still work
        let doc = markdown_to_adf("some __bold__ here").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 3);
        assert_eq!(content[1].text.as_deref(), Some("bold"));
        let marks = content[1].marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "strong");
    }

    #[test]
    fn intraword_underscore_closing_only() {
        // Opening _ is valid (preceded by space) but closing _ is intraword: _foo_bar
        let doc = markdown_to_adf("_foo_bar").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("_foo_bar"));
    }

    #[test]
    fn intraword_double_underscore_closing_only() {
        // Opening __ is valid (at start) but closing __ is intraword: __foo__bar
        let doc = markdown_to_adf("__foo__bar").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("__foo__bar"));
    }

    #[test]
    fn intraword_triple_underscore_closing_only() {
        // Opening ___ is valid (at start) but closing ___ is intraword: ___foo___bar
        let doc = markdown_to_adf("___foo___bar").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("___foo___bar"));
    }

    #[test]
    fn asterisk_emphasis_unaffected_by_intraword_fix() {
        // Asterisks should still work for intraword emphasis (CommonMark allows this)
        let doc = markdown_to_adf("foo*bar*baz").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        // Asterisks CAN be intraword emphasis per CommonMark
        assert!(content.len() > 1 || content[0].marks.is_some());
    }

    #[test]
    fn intraword_underscore_at_start_of_text() {
        // Underscore at start of text is not intraword (no preceding alphanumeric)
        let doc = markdown_to_adf("_italic_ word").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some("italic"));
        let marks = content[0].marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "em");
    }

    #[test]
    fn intraword_underscore_at_end_of_text() {
        // Underscore at end of text is not intraword (no following alphanumeric)
        let doc = markdown_to_adf("word _italic_").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        let last = content.last().unwrap();
        assert_eq!(last.text.as_deref(), Some("italic"));
        let marks = last.marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "em");
    }

    #[test]
    fn intraword_underscore_opening_only() {
        // Opening underscore is intraword but closing is not: a_b c_d
        // The first _ is intraword (a_b), so it shouldn't open emphasis
        let doc = markdown_to_adf("a_b c_d").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("a_b c_d"));
    }

    #[test]
    fn intraword_underscore_roundtrip() {
        // The original reproducer from issue #438
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"call the do_something_useful function"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should round-trip as a single text node");
        assert_eq!(
            content[0].text.as_deref(),
            Some("call the do_something_useful function")
        );
        assert!(content[0].marks.is_none());
    }

    #[test]
    fn asterisk_emphasis_roundtrip() {
        // The original reproducer from issue #452
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"Status: *confirmed* and active"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should round-trip as a single text node");
        assert_eq!(
            content[0].text.as_deref(),
            Some("Status: *confirmed* and active")
        );
        assert!(content[0].marks.is_none());
    }

    #[test]
    fn double_asterisk_roundtrip() {
        // **bold** delimiters in plain text should not become strong marks
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"Use **kwargs in Python"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should round-trip as a single text node");
        assert_eq!(content[0].text.as_deref(), Some("Use **kwargs in Python"));
        assert!(content[0].marks.is_none());
    }

    #[test]
    fn asterisk_with_em_mark_roundtrip() {
        // Text that already has an em mark should preserve both the mark and escaped content
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"a*b","marks":[{"type":"em"}]}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        // Find the node with em mark
        let em_node = content.iter().find(|n| {
            n.marks
                .as_ref()
                .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "em"))
        });
        assert!(em_node.is_some(), "should have an em-marked node");
        assert_eq!(em_node.unwrap().text.as_deref(), Some("a*b"));
    }

    #[test]
    fn lone_asterisk_roundtrip() {
        // A single asterisk that cannot form emphasis should round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"rating: 5 * stars"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should round-trip as a single text node");
        assert_eq!(content[0].text.as_deref(), Some("rating: 5 * stars"));
    }

    #[test]
    fn escape_emphasis_markers_unit() {
        assert_eq!(escape_emphasis_markers("hello"), "hello");
        assert_eq!(escape_emphasis_markers("*bold*"), r"\*bold\*");
        assert_eq!(escape_emphasis_markers("**strong**"), r"\*\*strong\*\*");
        assert_eq!(escape_emphasis_markers("no stars"), "no stars");
        assert_eq!(escape_emphasis_markers("a * b"), r"a \* b");
        assert_eq!(escape_emphasis_markers(""), "");
    }

    #[test]
    fn escape_emphasis_markers_underscore_intraword() {
        // Intraword underscores (alnum on both sides within the node) are
        // left as-is — the JFM parser will reject them as emphasis.
        assert_eq!(escape_emphasis_markers("foo_bar"), "foo_bar");
        assert_eq!(escape_emphasis_markers("a_b_c"), "a_b_c");
        assert_eq!(escape_emphasis_markers("foo__bar"), "foo__bar");
        assert_eq!(
            escape_emphasis_markers("call do_something_useful"),
            "call do_something_useful"
        );
    }

    #[test]
    fn escape_emphasis_markers_underscore_at_boundary() {
        // Leading and trailing underscores get escaped — adjacent text nodes
        // could supply the alphanumeric needed to close emphasis (issue #554).
        assert_eq!(escape_emphasis_markers("_Action"), r"\_Action");
        assert_eq!(escape_emphasis_markers("Action_"), r"Action\_");
        assert_eq!(escape_emphasis_markers("_ "), r"\_ ");
        assert_eq!(escape_emphasis_markers(" _"), r" \_");
        assert_eq!(escape_emphasis_markers("_"), r"\_");
    }

    #[test]
    fn escape_emphasis_markers_underscore_with_punctuation() {
        // Underscores adjacent to punctuation (not alphanumeric) get escaped.
        assert_eq!(escape_emphasis_markers("foo _bar"), r"foo \_bar");
        assert_eq!(escape_emphasis_markers("foo_ bar"), r"foo\_ bar");
        assert_eq!(escape_emphasis_markers("(_x_)"), r"(\_x\_)");
    }

    #[test]
    fn find_unescaped_skips_backslash_escaped() {
        // Escaped `**` should not be found
        assert_eq!(find_unescaped(r"a\*\*b**", "**"), Some(6));
        // No unescaped match at all
        assert_eq!(find_unescaped(r"a\*\*b", "**"), None);
        // Plain match without any escaping
        assert_eq!(find_unescaped("a**b", "**"), Some(1));
        // Empty haystack
        assert_eq!(find_unescaped("", "**"), None);
    }

    #[test]
    fn find_unescaped_char_skips_backslash_escaped() {
        // Escaped `*` should not be found
        assert_eq!(find_unescaped_char(r"a\*b*", b'*'), Some(4));
        // No unescaped match at all
        assert_eq!(find_unescaped_char(r"\*", b'*'), None);
        // Plain match
        assert_eq!(find_unescaped_char("a*b", b'*'), Some(1));
        // Empty haystack
        assert_eq!(find_unescaped_char("", b'*'), None);
    }

    #[test]
    fn double_asterisk_in_strong_mark_roundtrip() {
        // Text with ** inside a strong mark should preserve the literal **
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"call **kwargs","marks":[{"type":"strong"}]}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        let strong_node = content.iter().find(|n| {
            n.marks
                .as_ref()
                .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "strong"))
        });
        assert!(strong_node.is_some(), "should have a strong-marked node");
        assert_eq!(strong_node.unwrap().text.as_deref(), Some("call **kwargs"));
    }

    #[test]
    fn backtick_code_roundtrip() {
        // The original reproducer from issue #453
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"Set `max_retries` to 3 in the config"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should round-trip as a single text node");
        assert_eq!(
            content[0].text.as_deref(),
            Some("Set `max_retries` to 3 in the config")
        );
        assert!(content[0].marks.is_none());
    }

    #[test]
    fn multiple_backtick_spans_roundtrip() {
        // Multiple backtick-delimited spans in a single text node
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"Use `foo` and `bar` together"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should round-trip as a single text node");
        assert_eq!(
            content[0].text.as_deref(),
            Some("Use `foo` and `bar` together")
        );
        assert!(content[0].marks.is_none());
    }

    #[test]
    fn lone_backtick_roundtrip() {
        // A single backtick that cannot form a code span should round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"Use a ` character"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should round-trip as a single text node");
        assert_eq!(content[0].text.as_deref(), Some("Use a ` character"));
        assert!(content[0].marks.is_none());
    }

    #[test]
    fn backtick_with_code_mark_roundtrip() {
        // Text that already has a code mark should preserve both the mark and content
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"max_retries","marks":[{"type":"code"}]}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        assert_eq!(jfm.trim(), "`max_retries`");
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        let code_node = content.iter().find(|n| {
            n.marks
                .as_ref()
                .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "code"))
        });
        assert!(code_node.is_some(), "should have a code-marked node");
        assert_eq!(code_node.unwrap().text.as_deref(), Some("max_retries"));
    }

    #[test]
    fn backtick_with_em_mark_roundtrip() {
        // Backtick inside em-marked text should preserve both
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"use `cfg`","marks":[{"type":"em"}]}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        let em_node = content.iter().find(|n| {
            n.marks
                .as_ref()
                .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "em"))
        });
        assert!(em_node.is_some(), "should have an em-marked node");
        assert_eq!(em_node.unwrap().text.as_deref(), Some("use `cfg`"));
    }

    #[test]
    fn escape_pipes_in_cell_unit() {
        assert_eq!(escape_pipes_in_cell("hello"), "hello");
        assert_eq!(escape_pipes_in_cell("a|b"), r"a\|b");
        assert_eq!(escape_pipes_in_cell("|"), r"\|");
        assert_eq!(escape_pipes_in_cell("|a|b|"), r"\|a\|b\|");
        assert_eq!(escape_pipes_in_cell(""), "");
        assert_eq!(
            escape_pipes_in_cell("`parser.decode[T|json]`"),
            r"`parser.decode[T\|json]`"
        );
    }

    #[test]
    fn escape_backticks_unit() {
        assert_eq!(escape_backticks("hello"), "hello");
        assert_eq!(escape_backticks("`code`"), r"\`code\`");
        assert_eq!(escape_backticks("no ticks"), "no ticks");
        assert_eq!(escape_backticks("a ` b"), r"a \` b");
        assert_eq!(escape_backticks(""), "");
        assert_eq!(escape_backticks("`a` and `b`"), r"\`a\` and \`b\`");
    }

    // ── Issue #477: backslash escaping ──────────────────────────────

    #[test]
    fn backslash_in_text_roundtrip() {
        // The original reproducer from issue #477
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"The path is C:\\Users\\admin\\file.txt"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should round-trip as a single text node");
        assert_eq!(
            content[0].text.as_deref(),
            Some(r"The path is C:\Users\admin\file.txt")
        );
    }

    #[test]
    fn backslash_emitted_as_double_backslash() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"a\\b"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        assert!(
            jfm.contains(r"a\\b"),
            "JFM should contain escaped backslash: {jfm}"
        );
    }

    #[test]
    fn consecutive_backslashes_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"a\\\\b"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            content[0].text.as_deref(),
            Some(r"a\\b"),
            "consecutive backslashes should survive round-trip"
        );
    }

    #[test]
    fn backslash_with_strong_mark_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"C:\\Users","marks":[{"type":"strong"}]}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        let strong_node = content.iter().find(|n| {
            n.marks
                .as_ref()
                .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "strong"))
        });
        assert!(strong_node.is_some(), "should have a strong-marked node");
        assert_eq!(strong_node.unwrap().text.as_deref(), Some(r"C:\Users"));
    }

    #[test]
    fn backslash_with_code_mark_not_escaped() {
        // Code marks emit content verbatim — backslashes should NOT be escaped
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"C:\\Users","marks":[{"type":"code"}]}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        assert_eq!(jfm.trim(), r"`C:\Users`");
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        let code_node = content.iter().find(|n| {
            n.marks
                .as_ref()
                .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "code"))
        });
        assert!(code_node.is_some(), "should have a code-marked node");
        assert_eq!(code_node.unwrap().text.as_deref(), Some(r"C:\Users"));
    }

    #[test]
    fn backslash_before_special_chars_roundtrip() {
        // Backslash before characters that are themselves escaped (* ` :)
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"\\*not bold\\*"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            content[0].text.as_deref(),
            Some(r"\*not bold\*"),
            "backslash before special char should survive round-trip"
        );
    }

    #[test]
    fn backslash_and_newline_in_text_roundtrip() {
        // Text with both backslashes and embedded newlines
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"C:\\path\nline2"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            content[0].text.as_deref(),
            Some("C:\\path\nline2"),
            "backslash and newline should both survive round-trip"
        );
    }

    #[test]
    fn lone_backslash_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"a \\ b"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some(r"a \ b"));
    }

    #[test]
    fn trailing_backslash_in_text_roundtrip() {
        // A trailing backslash in text content (not a hardBreak) should round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"end\\"}]}]}"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            content[0].text.as_deref(),
            Some(r"end\"),
            "trailing backslash should survive round-trip"
        );
    }

    #[test]
    fn escape_bare_urls_unit() {
        assert_eq!(escape_bare_urls("hello"), "hello");
        assert_eq!(escape_bare_urls(""), "");
        assert_eq!(
            escape_bare_urls("https://example.com"),
            r"\https://example.com"
        );
        assert_eq!(
            escape_bare_urls("http://example.com"),
            r"\http://example.com"
        );
        assert_eq!(
            escape_bare_urls("see https://a.com and https://b.com"),
            r"see \https://a.com and \https://b.com"
        );
        // "http" without "://" is not a URL scheme — leave untouched
        assert_eq!(escape_bare_urls("http header"), "http header");
        assert_eq!(escape_bare_urls("https is secure"), "https is secure");
    }

    #[test]
    fn heading_not_valid_without_space() {
        // "#Title" without space should be a paragraph, not heading
        let doc = markdown_to_adf("#Title").unwrap();
        assert_eq!(doc.content[0].node_type, "paragraph");
    }

    #[test]
    fn heading_level_too_high() {
        // ####### (7 hashes) is not a valid heading
        let doc = markdown_to_adf("####### Not a heading").unwrap();
        assert_eq!(doc.content[0].node_type, "paragraph");
    }

    #[test]
    fn empty_document() {
        let doc = markdown_to_adf("").unwrap();
        assert!(doc.content.is_empty());
    }

    #[test]
    fn only_blank_lines() {
        let doc = markdown_to_adf("\n\n\n").unwrap();
        assert!(doc.content.is_empty());
    }

    #[test]
    fn code_block_unterminated() {
        // Code block without closing fence
        let md = "```rust\nfn main() {}";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "codeBlock");
    }

    #[test]
    fn mixed_document() {
        let md = "# Title\n\nA paragraph.\n\n- Item\n\n```\ncode\n```\n\n> quote\n\n---\n\n1. numbered\n";
        let doc = markdown_to_adf(md).unwrap();
        let types: Vec<&str> = doc.content.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec![
                "heading",
                "paragraph",
                "bulletList",
                "codeBlock",
                "blockquote",
                "rule",
                "orderedList",
            ]
        );
    }

    // ── Additional adf_to_markdown tests ───────────────────────────────

    #[test]
    fn adf_ordered_list_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::ordered_list(
                vec![
                    AdfNode::list_item(vec![AdfNode::paragraph(vec![AdfNode::text("First")])]),
                    AdfNode::list_item(vec![AdfNode::paragraph(vec![AdfNode::text("Second")])]),
                ],
                None,
            )],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("1. First"));
        assert!(md.contains("2. Second"));
    }

    #[test]
    fn adf_ordered_list_custom_start() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::ordered_list(
                vec![AdfNode::list_item(vec![AdfNode::paragraph(vec![
                    AdfNode::text("Third"),
                ])])],
                Some(3),
            )],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("3. Third"));
    }

    #[test]
    fn adf_blockquote_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::blockquote(vec![AdfNode::paragraph(vec![
                AdfNode::text("A quote"),
            ])])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("> A quote"));
    }

    #[test]
    fn adf_table_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![
                AdfNode::table_row(vec![
                    AdfNode::table_header(vec![AdfNode::paragraph(vec![AdfNode::text("Name")])]),
                    AdfNode::table_header(vec![AdfNode::paragraph(vec![AdfNode::text("Value")])]),
                ]),
                AdfNode::table_row(vec![
                    AdfNode::table_cell(vec![AdfNode::paragraph(vec![AdfNode::text("a")])]),
                    AdfNode::table_cell(vec![AdfNode::paragraph(vec![AdfNode::text("1")])]),
                ]),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("| Name | Value |"));
        assert!(md.contains("| --- | --- |"));
        assert!(md.contains("| a | 1 |"));
    }

    #[test]
    fn adf_media_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::media_single(
                "https://example.com/img.png",
                Some("Alt"),
            )],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("![Alt](https://example.com/img.png)"));
    }

    #[test]
    fn adf_media_no_alt_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::media_single("https://example.com/img.png", None)],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("![](https://example.com/img.png)"));
    }

    #[test]
    fn adf_italic_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "emphasis",
                vec![AdfMark::em()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "*emphasis*");
    }

    #[test]
    fn adf_strikethrough_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "deleted",
                vec![AdfMark::strike()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "~~deleted~~");
    }

    #[test]
    fn adf_inline_code_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "code",
                vec![AdfMark::code()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "`code`");
    }

    #[test]
    fn adf_code_with_link_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "func",
                vec![AdfMark::code(), AdfMark::link("https://example.com")],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "[`func`](https://example.com)");
    }

    #[test]
    fn adf_bold_italic_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "both",
                vec![AdfMark::strong(), AdfMark::em()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "***both***");
    }

    #[test]
    fn adf_bold_link_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "bold link",
                vec![AdfMark::strong(), AdfMark::link("https://example.com")],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "**[bold link](https://example.com)**");
    }

    #[test]
    fn adf_strikethrough_bold_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "struck",
                vec![AdfMark::strike(), AdfMark::strong()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "~~**struck**~~");
    }

    #[test]
    fn adf_hard_break_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![
                AdfNode::text("Line 1"),
                AdfNode::hard_break(),
                AdfNode::text("Line 2"),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("Line 1\\\n  Line 2"));
    }

    #[test]
    fn adf_unsupported_inline_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode {
                node_type: "unknownInline".to_string(),
                attrs: Some(serde_json::json!({"key": "value"})),
                content: None,
                text: None,
                marks: None,
                local_id: None,
                parameters: None,
            }])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        // Unsupported inline nodes now round-trip via an `:adf-unsupported`
        // directive carrying the full node JSON (issue #1117), replacing the
        // old lossy `<!-- unsupported inline -->` comment.
        assert!(md.contains(":adf-unsupported[]{json="));
        assert!(md.contains("unknownInline"));
        assert!(!md.contains("<!-- unsupported inline"));
    }

    #[test]
    fn unsupported_inline_round_trips() {
        let original = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![
                AdfNode::text("before "),
                AdfNode {
                    node_type: "unknownInline".to_string(),
                    attrs: Some(serde_json::json!({"key": "value", "n": 3})),
                    content: None,
                    text: Some("fallback".to_string()),
                    marks: None,
                    local_id: None,
                    parameters: None,
                },
                AdfNode::text(" after"),
            ])],
        };
        let md = adf_to_markdown(&original).unwrap();
        let restored = markdown_to_adf(&md).unwrap();
        // The paragraph's unknown inline node survives with its attrs and text.
        let para = &restored.content[0];
        let unknown = para
            .content
            .as_ref()
            .unwrap()
            .iter()
            .find(|n| n.node_type == "unknownInline")
            .expect("unknownInline node preserved");
        assert_eq!(unknown.attrs.as_ref().unwrap()["key"], "value");
        assert_eq!(unknown.attrs.as_ref().unwrap()["n"], 3);
        assert_eq!(unknown.text.as_deref(), Some("fallback"));
    }

    // ── mediaInline tests (issue #476) ─────────────────────────────────

    #[test]
    fn adf_media_inline_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![
                AdfNode::text("see "),
                AdfNode::media_inline(serde_json::json!({
                    "type": "image",
                    "id": "abcdef01-2345-6789-abcd-abcdef012345",
                    "collection": "contentId-111111",
                    "width": 200,
                    "height": 100
                })),
                AdfNode::text(" for details"),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":media-inline[]{"), "got: {md}");
        assert!(md.contains("type=image"));
        assert!(md.contains("id=abcdef01-2345-6789-abcd-abcdef012345"));
        assert!(md.contains("collection=contentId-111111"));
        assert!(md.contains("width=200"));
        assert!(md.contains("height=100"));
        assert!(!md.contains("<!-- unsupported inline"));
    }

    #[test]
    fn media_inline_round_trip() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![
                AdfNode::text("see "),
                AdfNode::media_inline(serde_json::json!({
                    "type": "image",
                    "id": "abcdef01-2345-6789-abcd-abcdef012345",
                    "collection": "contentId-111111",
                    "width": 200,
                    "height": 100
                })),
                AdfNode::text(" for details"),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some("see "));
        assert_eq!(content[1].node_type, "mediaInline");
        let attrs = content[1].attrs.as_ref().unwrap();
        assert_eq!(attrs["type"], "image");
        assert_eq!(attrs["id"], "abcdef01-2345-6789-abcd-abcdef012345");
        assert_eq!(attrs["collection"], "contentId-111111");
        assert_eq!(attrs["width"], 200);
        assert_eq!(attrs["height"], 100);
        assert_eq!(content[2].text.as_deref(), Some(" for details"));
    }

    #[test]
    fn media_inline_external_url_round_trip() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::media_inline(
                serde_json::json!({
                    "type": "external",
                    "url": "https://example.com/image.png",
                    "alt": "example",
                    "width": 400,
                    "height": 300
                }),
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].node_type, "mediaInline");
        let attrs = content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["type"], "external");
        assert_eq!(attrs["url"], "https://example.com/image.png");
        assert_eq!(attrs["alt"], "example");
        assert_eq!(attrs["width"], 400);
        assert_eq!(attrs["height"], 300);
    }

    #[test]
    fn media_inline_minimal_attrs() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::media_inline(
                serde_json::json!({"type": "file", "id": "abc-123"}),
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].node_type, "mediaInline");
        let attrs = content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["type"], "file");
        assert_eq!(attrs["id"], "abc-123");
    }

    #[test]
    fn media_inline_from_issue_476_reproducer() {
        // Exact reproducer from issue #476
        let adf_json: serde_json::Value = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [
                {
                    "type": "paragraph",
                    "content": [
                        {"type": "text", "text": "see "},
                        {
                            "type": "mediaInline",
                            "attrs": {
                                "collection": "contentId-111111",
                                "height": 100,
                                "id": "abcdef01-2345-6789-abcd-abcdef012345",
                                "localId": "aabbccdd-1234-5678-abcd-aabbccdd1234",
                                "type": "image",
                                "width": 200
                            }
                        },
                        {"type": "text", "text": " for details"}
                    ]
                }
            ]
        });
        let doc: AdfDocument = serde_json::from_value(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            !md.contains("<!-- unsupported inline"),
            "mediaInline should not be unsupported; got: {md}"
        );

        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content[1].node_type, "mediaInline");
        let attrs = content[1].attrs.as_ref().unwrap();
        assert_eq!(attrs["type"], "image");
        assert_eq!(attrs["id"], "abcdef01-2345-6789-abcd-abcdef012345");
        assert_eq!(attrs["collection"], "contentId-111111");
        assert_eq!(attrs["width"], 200);
        assert_eq!(attrs["height"], 100);
        assert_eq!(attrs["localId"], "aabbccdd-1234-5678-abcd-aabbccdd1234");
    }

    #[test]
    fn emoji_shortcode() {
        let doc = markdown_to_adf("Hello :wave: world").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some("Hello "));
        assert_eq!(content[1].node_type, "emoji");
        assert_eq!(content[1].attrs.as_ref().unwrap()["shortName"], ":wave:");
        assert_eq!(content[2].text.as_deref(), Some(" world"));
    }

    #[test]
    fn adf_emoji_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::emoji("thumbsup")])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":thumbsup:"));
    }

    #[test]
    fn adf_emoji_with_colon_prefix_to_markdown() {
        // JIRA stores shortName as ":thumbsup:" with colons
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode {
                node_type: "emoji".to_string(),
                attrs: Some(serde_json::json!({"shortName": ":thumbsup:"})),
                content: None,
                text: None,
                marks: None,
                local_id: None,
                parameters: None,
            }])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":thumbsup:"));
        // Should not produce ::thumbsup:: (double colons)
        assert!(!md.contains("::thumbsup::"));
    }

    #[test]
    fn round_trip_emoji() {
        let md = "Hello :wave: world\n";
        let doc = markdown_to_adf(md).unwrap();
        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains(":wave:"));
    }

    #[test]
    fn emoji_with_id_and_text_round_trips() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode {
                node_type: "emoji".to_string(),
                attrs: Some(
                    serde_json::json!({"shortName": ":check_mark:", "id": "2705", "text": "✅"}),
                ),
                content: None,
                text: None,
                marks: None,
                local_id: None,
                parameters: None,
            }])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":check_mark:"), "shortcode present: {md}");
        assert!(md.contains("id="), "id attr present: {md}");
        assert!(md.contains("text="), "text attr present: {md}");

        // Round-trip back to ADF
        let round_tripped = markdown_to_adf(&md).unwrap();
        let emoji = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let attrs = emoji.attrs.as_ref().unwrap();
        assert_eq!(attrs["shortName"], ":check_mark:");
        assert_eq!(attrs["id"], "2705");
        assert_eq!(attrs["text"], "✅");
    }

    #[test]
    fn emoji_without_extra_attrs_still_works() {
        let md = "Hello :wave: world\n";
        let doc = markdown_to_adf(md).unwrap();
        let emoji = &doc.content[0].content.as_ref().unwrap()[1];
        assert_eq!(emoji.attrs.as_ref().unwrap()["shortName"], ":wave:");
        // No id or text attrs when not provided
        assert!(emoji.attrs.as_ref().unwrap().get("id").is_none());
    }

    #[test]
    fn emoji_shortname_preserves_colons_round_trip() {
        // Issue #362: emoji shortName colons stripped during round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"emoji","attrs":{"shortName":":cross_mark:","id":"atlassian-cross_mark","text":"❌"}}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        // ADF → markdown → ADF round-trip
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let emoji = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let attrs = emoji.attrs.as_ref().unwrap();
        assert_eq!(
            attrs["shortName"], ":cross_mark:",
            "shortName should preserve colons, got: {}",
            attrs["shortName"]
        );
        assert_eq!(attrs["id"], "atlassian-cross_mark");
        assert_eq!(attrs["text"], "❌");
    }

    #[test]
    fn emoji_shortname_without_colons_preserved() {
        // Issue #379: shortName without colons should not gain colons
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"emoji","attrs":{"shortName":"white_check_mark","id":"2705","text":"✅"}}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let emoji = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let attrs = emoji.attrs.as_ref().unwrap();
        assert_eq!(
            attrs["shortName"], "white_check_mark",
            "shortName without colons should stay without colons, got: {}",
            attrs["shortName"]
        );
    }

    #[test]
    fn colon_in_text_not_emoji() {
        // A lone colon should not trigger emoji parsing
        let doc = markdown_to_adf("Time is 10:30 today").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].node_type, "text");
    }

    #[test]
    fn text_with_shortcode_pattern_round_trips_as_text() {
        // Issue #450: `:fire:` in a text node must not become an emoji node
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"Alert :fire: triggered on pod:pod42"}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        assert_eq!(
            content.len(),
            1,
            "should be a single text node, got: {content:?}"
        );
        assert_eq!(content[0].node_type, "text");
        assert_eq!(
            content[0].text.as_deref().unwrap(),
            "Alert :fire: triggered on pod:pod42"
        );
    }

    #[test]
    fn double_colon_pattern_round_trips_as_text() {
        // Issue #450: `::Active::` should not be parsed as emoji `:Active:`
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"Status::Active::Running"}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        assert_eq!(
            content.len(),
            1,
            "should be a single text node, got: {content:?}"
        );
        assert_eq!(content[0].node_type, "text");
        assert_eq!(
            content[0].text.as_deref().unwrap(),
            "Status::Active::Running"
        );
    }

    #[test]
    fn real_emoji_node_still_round_trips() {
        // Ensure actual emoji ADF nodes still work after the escaping fix
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Hello "},
          {"type":"emoji","attrs":{"shortName":":fire:","id":"1f525","text":"🔥"}},
          {"type":"text","text":" world"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        // Should have: text("Hello ") + emoji(:fire:) + text(" world")
        assert_eq!(content.len(), 3, "should have 3 nodes: {content:?}");
        assert_eq!(content[0].text.as_deref(), Some("Hello "));
        assert_eq!(content[1].node_type, "emoji");
        assert_eq!(content[1].attrs.as_ref().unwrap()["shortName"], ":fire:");
        assert_eq!(content[2].text.as_deref(), Some(" world"));
    }

    #[test]
    fn combined_emoji_shortname_round_trips_as_single_node() {
        // Issue #576: an emoji node whose shortName is a combination of two
        // shortcodes (e.g. ":slightly_smiling_face::bow:") must survive the
        // ADF → markdown → ADF round-trip as a single emoji node rather than
        // being split into two.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Thanks for the help "},
          {"type":"emoji","attrs":{"shortName":":slightly_smiling_face::bow:","id":"","text":""}}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        assert_eq!(
            content.len(),
            2,
            "should have text + single combined emoji: {content:?}"
        );
        assert_eq!(content[0].text.as_deref(), Some("Thanks for the help "));
        assert_eq!(content[1].node_type, "emoji");
        let attrs = content[1].attrs.as_ref().unwrap();
        assert_eq!(attrs["shortName"], ":slightly_smiling_face::bow:");
        assert_eq!(attrs["id"], "");
        assert_eq!(attrs["text"], "");
    }

    #[test]
    fn triple_combined_emoji_shortname_round_trips_as_single_node() {
        // Three-part combined shortName must also survive round-trip.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"emoji","attrs":{"shortName":":a::b::c:","id":"x","text":""}}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        assert_eq!(content.len(), 1, "should be single emoji: {content:?}");
        assert_eq!(content[0].node_type, "emoji");
        let attrs = content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["shortName"], ":a::b::c:");
        assert_eq!(attrs["id"], "x");
    }

    #[test]
    fn consecutive_emojis_remain_separate_nodes() {
        // Two independent emoji nodes (each with their own directive) must
        // remain two separate nodes — the combined-chain logic must not
        // swallow the second emoji.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"emoji","attrs":{"shortName":":fire:","id":"1f525","text":"🔥"}},
          {"type":"emoji","attrs":{"shortName":":water:","id":"1f4a7","text":"💧"}}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        assert_eq!(content.len(), 2, "should be two emoji nodes: {content:?}");
        assert_eq!(content[0].node_type, "emoji");
        assert_eq!(content[0].attrs.as_ref().unwrap()["shortName"], ":fire:");
        assert_eq!(content[1].node_type, "emoji");
        assert_eq!(content[1].attrs.as_ref().unwrap()["shortName"], ":water:");
    }

    #[test]
    fn adjacent_shortcodes_without_directive_parse_as_two_emojis() {
        // Raw markdown with two adjacent shortcodes and no directive should
        // still parse as two separate emoji nodes.
        let md = ":fire::water:";
        let doc = markdown_to_adf(md).unwrap();
        let content = doc.content[0].content.as_ref().unwrap();

        assert_eq!(content.len(), 2, "should be two emojis: {content:?}");
        assert_eq!(content[0].attrs.as_ref().unwrap()["shortName"], ":fire:");
        assert_eq!(content[1].attrs.as_ref().unwrap()["shortName"], ":water:");
    }

    #[test]
    fn combined_emoji_shortname_preserves_local_id() {
        // The directive's localId should be preserved when the chain is
        // collapsed into a single emoji node.
        let md = r#":a::b:{shortName=":a::b:" id="x" text="y" localId="abc"}"#;
        let doc = markdown_to_adf(md).unwrap();
        let content = doc.content[0].content.as_ref().unwrap();

        assert_eq!(content.len(), 1, "should be single emoji: {content:?}");
        let attrs = content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["shortName"], ":a::b:");
        assert_eq!(attrs["id"], "x");
        assert_eq!(attrs["text"], "y");
        assert_eq!(attrs["localId"], "abc");
    }

    #[test]
    fn text_shortcode_with_marks_round_trips() {
        // Bold text containing an emoji-like shortcode should round-trip as bold text
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Alert :fire: triggered","marks":[{"type":"strong"}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        assert_eq!(
            content.len(),
            1,
            "should be single bold text node: {content:?}"
        );
        assert_eq!(content[0].node_type, "text");
        assert_eq!(
            content[0].text.as_deref().unwrap(),
            "Alert :fire: triggered"
        );
        assert!(content[0]
            .marks
            .as_ref()
            .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "strong")));
    }

    #[test]
    fn mixed_emoji_node_and_text_shortcode_round_trips() {
        // Real emoji node adjacent to text containing a shortcode-like pattern
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"emoji","attrs":{"shortName":":wave:","id":"1f44b","text":"👋"}},
          {"type":"text","text":" says :hello: to you"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        // Should be: emoji(:wave:) + text(" says :hello: to you")
        assert_eq!(content.len(), 2, "should have 2 nodes: {content:?}");
        assert_eq!(content[0].node_type, "emoji");
        assert_eq!(content[0].attrs.as_ref().unwrap()["shortName"], ":wave:");
        assert_eq!(content[1].node_type, "text");
        assert_eq!(content[1].text.as_deref().unwrap(), " says :hello: to you");
    }

    #[test]
    fn code_block_with_shortcode_pattern_round_trips() {
        // Issue #552: Code block content containing `::Name::` patterns must not
        // be re-parsed as emoji shortcodes.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"codeBlock","attrs":{"language":"ruby"},"content":[
            {"type":"text","text":"module Foo::Bar::Baz\n  def hello\n    puts 'world'\n  end\nend"}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();

        assert_eq!(
            round_tripped.content.len(),
            1,
            "should be a single codeBlock"
        );
        let cb = &round_tripped.content[0];
        assert_eq!(cb.node_type, "codeBlock");
        let content = cb.content.as_ref().expect("codeBlock content");
        assert_eq!(
            content.len(),
            1,
            "should be a single text node: {content:?}"
        );
        assert_eq!(content[0].node_type, "text");
        assert_eq!(
            content[0].text.as_deref().unwrap(),
            "module Foo::Bar::Baz\n  def hello\n    puts 'world'\n  end\nend"
        );
        assert!(
            content.iter().all(|n| n.node_type != "emoji"),
            "no emoji nodes should be present, got: {content:?}"
        );
    }

    #[test]
    fn code_block_with_exact_namespaced_shortcode_pattern_round_trips() {
        // Issue #552: Use a namespaced pattern modeled on the bug report.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"codeBlock","attrs":{"language":"ruby"},"content":[
            {"type":"text","text":"class ZBC::Acme::PlanType::Professional < Base"}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();

        let cb = &round_tripped.content[0];
        assert_eq!(cb.node_type, "codeBlock");
        let content = cb.content.as_ref().expect("codeBlock content");
        assert_eq!(content.len(), 1, "should be a single text node");
        assert_eq!(
            content[0].text.as_deref().unwrap(),
            "class ZBC::Acme::PlanType::Professional < Base"
        );
    }

    #[test]
    fn code_block_with_literal_shortcode_round_trips() {
        // Issue #552: Content that is exactly a shortcode (`:fire:`) inside a
        // code block should survive the round-trip as literal text, not emoji.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"codeBlock","attrs":{"language":"text"},"content":[
            {"type":"text","text":":fire: :wave: :thumbsup:"}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();

        let cb = &round_tripped.content[0];
        assert_eq!(cb.node_type, "codeBlock");
        let content = cb.content.as_ref().expect("codeBlock content");
        assert_eq!(
            content.len(),
            1,
            "should be a single text node: {content:?}"
        );
        assert_eq!(content[0].node_type, "text");
        assert_eq!(
            content[0].text.as_deref().unwrap(),
            ":fire: :wave: :thumbsup:"
        );
    }

    #[test]
    fn inline_code_with_shortcode_pattern_round_trips() {
        // Issue #552: Inline code containing `::Name::` patterns must not be
        // re-parsed as emoji shortcodes.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"See "},
          {"type":"text","text":"Foo::Bar::Baz","marks":[{"type":"code"}]},
          {"type":"text","text":" for details"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        assert_eq!(content.len(), 3, "should have 3 text nodes: {content:?}");
        assert_eq!(content[0].text.as_deref(), Some("See "));
        assert_eq!(content[1].text.as_deref(), Some("Foo::Bar::Baz"));
        assert!(content[1]
            .marks
            .as_ref()
            .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "code")));
        assert_eq!(content[2].text.as_deref(), Some(" for details"));
        assert!(
            content.iter().all(|n| n.node_type != "emoji"),
            "no emoji nodes should be present"
        );
    }

    #[test]
    fn inline_code_with_literal_shortcode_round_trips() {
        // Issue #552: Inline code whose content is exactly a shortcode must be
        // preserved as code, not converted to an emoji.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":":fire:","marks":[{"type":"code"}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        assert_eq!(
            content.len(),
            1,
            "should be a single code node: {content:?}"
        );
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[0].text.as_deref(), Some(":fire:"));
        assert!(content[0]
            .marks
            .as_ref()
            .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "code")));
    }

    #[test]
    fn code_block_in_list_with_shortcode_pattern_round_trips() {
        // Issue #552: A code block containing shortcode-like patterns nested in
        // a list should still survive round-trip without emoji corruption.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"bulletList","content":[
            {"type":"listItem","content":[
              {"type":"codeBlock","attrs":{"language":"ruby"},"content":[
                {"type":"text","text":"Foo::Bar::Baz"}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();

        let list = &round_tripped.content[0];
        assert_eq!(list.node_type, "bulletList");
        let item = &list.content.as_ref().unwrap()[0];
        assert_eq!(item.node_type, "listItem");
        let cb = &item.content.as_ref().unwrap()[0];
        assert_eq!(cb.node_type, "codeBlock");
        let cb_content = cb.content.as_ref().unwrap();
        assert_eq!(cb_content[0].text.as_deref(), Some("Foo::Bar::Baz"));
        assert_eq!(cb_content[0].node_type, "text");
    }

    #[test]
    fn code_block_with_unicode_shortcode_pattern_round_trips() {
        // Issue #552: Code block content with non-ASCII colon-delimited words
        // (e.g. CJK or accented characters) must round-trip without splitting
        // or emoji corruption.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"codeBlock","attrs":{"language":"ruby"},"content":[
            {"type":"text","text":"class ZBC::配置::Production < Base"}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();

        let cb = &round_tripped.content[0];
        assert_eq!(cb.node_type, "codeBlock");
        let content = cb.content.as_ref().expect("codeBlock content");
        assert_eq!(content.len(), 1);
        assert_eq!(
            content[0].text.as_deref().unwrap(),
            "class ZBC::配置::Production < Base"
        );
    }

    #[test]
    fn list_item_hardbreak_then_code_block_round_trips() {
        // Issue #552: A list item whose first paragraph ends with a hardBreak
        // followed by a codeBlock must round-trip correctly.  Previously, the
        // hardBreak's `\` continuation swallowed the 2-space-indented code
        // fence line, turning the whole block into a paragraph where `::Bar::`
        // was re-parsed as an emoji.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"bulletList","content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Consider removing this check."},
                {"type":"hardBreak"}
              ]},
              {"type":"codeBlock","content":[
                {"type":"text","text":"x = Foo::Bar::Baz.new"}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();

        let list = &round_tripped.content[0];
        assert_eq!(list.node_type, "bulletList");
        let item = &list.content.as_ref().unwrap()[0];
        assert_eq!(item.node_type, "listItem");
        let item_content = item.content.as_ref().unwrap();
        assert_eq!(
            item_content.len(),
            2,
            "listItem should have paragraph + codeBlock, got: {item_content:?}"
        );
        assert_eq!(item_content[0].node_type, "paragraph");
        assert_eq!(item_content[1].node_type, "codeBlock");

        // The code block text must survive verbatim — no emoji splitting.
        let cb_content = item_content[1].content.as_ref().unwrap();
        assert_eq!(cb_content[0].node_type, "text");
        assert_eq!(
            cb_content[0].text.as_deref().unwrap(),
            "x = Foo::Bar::Baz.new"
        );

        // And there should be no emoji node anywhere in the tree.
        assert!(
            item_content
                .iter()
                .flat_map(|n| n.content.iter().flat_map(|c| c.iter()))
                .all(|n| n.node_type != "emoji"),
            "no emoji nodes should be present, got: {item_content:?}"
        );
    }

    #[test]
    fn list_item_hardbreak_then_nested_list_still_works() {
        // Ensure the hardBreak continuation fix doesn't break nested list
        // handling — an indented `- item` line after a hardBreak is still a
        // nested list, not a code fence.
        let md = "- first\\\n  continuation text\\\n  - nested item\n";
        let doc = markdown_to_adf(md).unwrap();
        let list = &doc.content[0];
        assert_eq!(list.node_type, "bulletList");
        let item = &list.content.as_ref().unwrap()[0];
        // First paragraph should contain the continuation text joined via hardBreaks
        let item_content = item.content.as_ref().unwrap();
        let para = &item_content[0];
        assert_eq!(para.node_type, "paragraph");
        let para_nodes = para.content.as_ref().unwrap();
        assert!(
            para_nodes
                .iter()
                .any(|n| n.text.as_deref() == Some("continuation text")),
            "continuation text should survive: {para_nodes:?}"
        );
    }

    #[test]
    fn list_item_hardbreak_then_image_still_works() {
        // Regression check for issue #490: the image-skip behaviour in
        // collect_hardbreak_continuations must still hold after the code-fence
        // fix.  The `![](url)` line must remain a block-level mediaSingle, not
        // be swallowed into the paragraph.
        let md = "- first\\\n  ![](https://example.com/x.png){type=file id=x}\n";
        let doc = markdown_to_adf(md).unwrap();
        let list = &doc.content[0];
        let item = &list.content.as_ref().unwrap()[0];
        let item_content = item.content.as_ref().unwrap();
        // The image should be a sibling block, not part of the first paragraph.
        assert!(
            item_content.iter().any(|n| n.node_type == "mediaSingle"),
            "mediaSingle should still be a block-level sibling, got: {item_content:?}"
        );
    }

    #[test]
    fn list_item_hardbreak_then_container_directive_round_trips() {
        // Issue #552: Same hardBreak-swallows-block-siblings bug class — a
        // container directive (`:::panel`) after a hardBreak must also not be
        // consumed as a continuation line.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"bulletList","content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"intro"},
                {"type":"hardBreak"}
              ]},
              {"type":"panel","attrs":{"panelType":"info"},"content":[
                {"type":"paragraph","content":[
                  {"type":"text","text":"panel body"}
                ]}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();

        let item = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let item_content = item.content.as_ref().unwrap();
        assert!(
            item_content.iter().any(|n| n.node_type == "panel"),
            "panel should survive as block-level sibling, got: {item_content:?}"
        );
    }

    #[test]
    fn inline_code_with_unicode_shortcode_pattern_round_trips() {
        // Issue #552: Inline code containing non-ASCII colon-delimited words
        // must round-trip without emoji corruption.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"See "},
          {"type":"text","text":"ZBC::配置::Production","marks":[{"type":"code"}]},
          {"type":"text","text":" for prod"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        assert_eq!(content.len(), 3, "should have 3 nodes: {content:?}");
        assert_eq!(content[1].text.as_deref(), Some("ZBC::配置::Production"));
        assert!(content[1]
            .marks
            .as_ref()
            .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "code")));
    }

    #[test]
    fn code_block_followed_by_shortcode_text_round_trips() {
        // Issue #552: A code block with colon-delimited content followed by a
        // paragraph containing emoji-like text should not confuse parsing.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"codeBlock","attrs":{"language":"ruby"},"content":[
            {"type":"text","text":"Foo::Bar::Baz"}
          ]},
          {"type":"paragraph","content":[
            {"type":"text","text":"Status::Active::Running"}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();

        assert_eq!(round_tripped.content.len(), 2);
        let cb = &round_tripped.content[0];
        assert_eq!(cb.node_type, "codeBlock");
        let cb_content = cb.content.as_ref().unwrap();
        assert_eq!(cb_content[0].text.as_deref(), Some("Foo::Bar::Baz"));

        let para = &round_tripped.content[1];
        assert_eq!(para.node_type, "paragraph");
        let para_content = para.content.as_ref().unwrap();
        assert_eq!(para_content.len(), 1);
        assert_eq!(para_content[0].node_type, "text");
        assert_eq!(
            para_content[0].text.as_deref(),
            Some("Status::Active::Running")
        );
    }

    #[test]
    fn adf_inline_card_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode {
                node_type: "inlineCard".to_string(),
                attrs: Some(
                    serde_json::json!({"url": "https://org.atlassian.net/browse/ACME-4382"}),
                ),
                content: None,
                text: None,
                marks: None,
                local_id: None,
                parameters: None,
            }])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":card[https://org.atlassian.net/browse/ACME-4382]"));
        assert!(!md.contains("<!-- unsupported inline"));
    }

    #[test]
    fn inline_card_directive_round_trips() {
        // inlineCard → :card[url] → inlineCard
        let original = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::inline_card(
                "https://org.atlassian.net/browse/ACME-4382",
            )])],
        };
        let md = adf_to_markdown(&original).unwrap();
        assert!(md.contains(":card[https://org.atlassian.net/browse/ACME-4382]"));
        let restored = markdown_to_adf(&md).unwrap();
        let node = &restored.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.node_type, "inlineCard");
        assert_eq!(
            node.attrs.as_ref().unwrap()["url"],
            "https://org.atlassian.net/browse/ACME-4382"
        );
    }

    #[test]
    fn inline_card_directive_parsed_from_jfm() {
        // :card[url] in JFM → inlineCard in ADF
        let doc = markdown_to_adf("See :card[https://example.com/issue/123] for details.").unwrap();
        let nodes = doc.content[0].content.as_ref().unwrap();
        assert_eq!(nodes[0].node_type, "text");
        assert_eq!(nodes[0].text.as_deref(), Some("See "));
        assert_eq!(nodes[1].node_type, "inlineCard");
        assert_eq!(
            nodes[1].attrs.as_ref().unwrap()["url"],
            "https://example.com/issue/123"
        );
        assert_eq!(nodes[2].node_type, "text");
        assert_eq!(nodes[2].text.as_deref(), Some(" for details."));
    }

    #[test]
    fn self_link_becomes_link_mark_not_inline_card() {
        // Issue #378: [url](url) should produce a link mark, not inlineCard.
        // inlineCard is only for :card[url] directives and bare URLs.
        let doc = markdown_to_adf("[https://example.com](https://example.com)").unwrap();
        let node = &doc.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.node_type, "text");
        assert_eq!(node.text.as_deref(), Some("https://example.com"));
        let mark = &node.marks.as_ref().unwrap()[0];
        assert_eq!(mark.mark_type, "link");
        assert_eq!(mark.attrs.as_ref().unwrap()["href"], "https://example.com");
    }

    #[test]
    fn url_link_text_with_trailing_slash_mismatch_becomes_link_mark() {
        // Issue #523: [url](url/) where text and href differ only by trailing
        // slash should produce a text node with link mark, not an inlineCard.
        let doc =
            markdown_to_adf("[https://octopz.example.com](https://octopz.example.com/)").unwrap();
        let node = &doc.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.node_type, "text");
        assert_eq!(node.text.as_deref(), Some("https://octopz.example.com"));
        let mark = &node.marks.as_ref().unwrap()[0];
        assert_eq!(mark.mark_type, "link");
        assert_eq!(
            mark.attrs.as_ref().unwrap()["href"],
            "https://octopz.example.com/"
        );
    }

    #[test]
    fn named_link_does_not_become_inline_card() {
        // [#4668](url) — text differs from url, stays as a link mark
        let doc = markdown_to_adf("[#4668](https://github.com/org/repo/pull/4668)").unwrap();
        let node = &doc.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.node_type, "text");
        assert_eq!(node.text.as_deref(), Some("#4668"));
        let mark = &node.marks.as_ref().unwrap()[0];
        assert_eq!(mark.mark_type, "link");
    }

    #[test]
    fn adf_inline_card_no_url_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode {
                node_type: "inlineCard".to_string(),
                attrs: Some(serde_json::json!({})),
                content: None,
                text: None,
                marks: None,
                local_id: None,
                parameters: None,
            }])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        // No url attr — renders nothing (not a comment)
        assert!(!md.contains("<!-- unsupported inline"));
    }

    #[test]
    fn adf_code_block_no_language_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::code_block(None, "plain code")],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("```\n"));
        assert!(md.contains("plain code"));
    }

    #[test]
    fn adf_code_block_empty_language_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::code_block(Some(""), "plain code")],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("```\"\"\n"));
        assert!(md.contains("plain code"));
    }

    // ── Additional round-trip tests ────────────────────────────────────

    #[test]
    fn round_trip_table() {
        let md = "| A | B |\n| --- | --- |\n| 1 | 2 |\n";
        let adf = markdown_to_adf(md).unwrap();
        let restored = adf_to_markdown(&adf).unwrap();
        assert!(restored.contains("| A | B |"));
        assert!(restored.contains("| 1 | 2 |"));
    }

    #[test]
    fn round_trip_blockquote() {
        let md = "> This is quoted\n";
        let adf = markdown_to_adf(md).unwrap();
        let restored = adf_to_markdown(&adf).unwrap();
        assert!(restored.contains("> This is quoted"));
    }

    #[test]
    fn round_trip_image() {
        let md = "![Logo](https://example.com/logo.png)\n";
        let adf = markdown_to_adf(md).unwrap();
        let restored = adf_to_markdown(&adf).unwrap();
        assert!(restored.contains("![Logo](https://example.com/logo.png)"));
    }

    #[test]
    fn round_trip_ordered_list() {
        let md = "1. A\n2. B\n3. C\n";
        let adf = markdown_to_adf(md).unwrap();
        let restored = adf_to_markdown(&adf).unwrap();
        assert!(restored.contains("1. A"));
        assert!(restored.contains("2. B"));
        assert!(restored.contains("3. C"));
    }

    #[test]
    fn round_trip_inline_marks() {
        let md = "Text with `code` and ~~strike~~ and [link](https://x.com).\n";
        let adf = markdown_to_adf(md).unwrap();
        let restored = adf_to_markdown(&adf).unwrap();
        assert!(restored.contains("`code`"));
        assert!(restored.contains("~~strike~~"));
        assert!(restored.contains("[link](https://x.com)"));
    }

    // ── Container directive tests (Tier 2) ───────────────────────────

    #[test]
    fn panel_info() {
        let md = ":::panel{type=info}\nThis is informational.\n:::";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "panel");
        assert_eq!(doc.content[0].attrs.as_ref().unwrap()["panelType"], "info");
        let inner = doc.content[0].content.as_ref().unwrap();
        assert_eq!(inner[0].node_type, "paragraph");
    }

    #[test]
    fn adf_panel_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::panel(
                "warning",
                vec![AdfNode::paragraph(vec![AdfNode::text("Be careful.")])],
            )],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":::panel{type=warning}"));
        assert!(md.contains("Be careful."));
        assert!(md.contains(":::"));
    }

    #[test]
    fn round_trip_panel() {
        let md = ":::panel{type=info}\nThis is informational.\n:::\n";
        let doc = markdown_to_adf(md).unwrap();
        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains(":::panel{type=info}"));
        assert!(result.contains("This is informational."));
    }

    #[test]
    fn expand_with_title() {
        let md = ":::expand{title=\"Click me\"}\nHidden content.\n:::";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "expand");
        assert_eq!(doc.content[0].attrs.as_ref().unwrap()["title"], "Click me");
    }

    #[test]
    fn adf_expand_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::expand(
                Some("Details"),
                vec![AdfNode::paragraph(vec![AdfNode::text("Inner.")])],
            )],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":::expand{title=\"Details\"}"));
        assert!(md.contains("Inner."));
    }

    #[test]
    fn round_trip_expand() {
        let md = ":::expand{title=\"Details\"}\nInner content.\n:::\n";
        let doc = markdown_to_adf(md).unwrap();
        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains(":::expand{title=\"Details\"}"));
        assert!(result.contains("Inner content."));
    }

    #[test]
    fn layout_two_columns() {
        let md =
            "::::layout\n:::column{width=50}\nLeft.\n:::\n:::column{width=50}\nRight.\n:::\n::::";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "layoutSection");
        let columns = doc.content[0].content.as_ref().unwrap();
        assert_eq!(columns.len(), 2);
        assert_eq!(columns[0].node_type, "layoutColumn");
        assert_eq!(columns[1].node_type, "layoutColumn");
    }

    #[test]
    fn adf_layout_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::layout_section(vec![
                AdfNode::layout_column(50, vec![AdfNode::paragraph(vec![AdfNode::text("Left.")])]),
                AdfNode::layout_column(50, vec![AdfNode::paragraph(vec![AdfNode::text("Right.")])]),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("::::layout"));
        assert!(md.contains(":::column{width=50}"));
        assert!(md.contains("Left."));
        assert!(md.contains("Right."));
    }

    #[test]
    fn layout_column_localid_roundtrip() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "layoutSection",
                "content": [
                    {
                        "type": "layoutColumn",
                        "attrs": {"width": 50.0, "localId": "aabb112233cc"},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "Left"}]}]
                    },
                    {
                        "type": "layoutColumn",
                        "attrs": {"width": 50.0, "localId": "ddeeff445566"},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "Right"}]}]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=aabb112233cc"),
            "first column localId should appear in markdown: {md}"
        );
        assert!(
            md.contains("localId=ddeeff445566"),
            "second column localId should appear in markdown: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let cols = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            cols[0].attrs.as_ref().unwrap()["localId"],
            "aabb112233cc",
            "first column localId should round-trip"
        );
        assert_eq!(
            cols[1].attrs.as_ref().unwrap()["localId"],
            "ddeeff445566",
            "second column localId should round-trip"
        );
    }

    #[test]
    fn layout_column_without_localid() {
        let md =
            "::::layout\n:::column{width=50}\nLeft.\n:::\n:::column{width=50}\nRight.\n:::\n::::";
        let doc = markdown_to_adf(md).unwrap();
        let cols = doc.content[0].content.as_ref().unwrap();
        assert!(
            cols[0].attrs.as_ref().unwrap().get("localId").is_none(),
            "column without localId should not gain one"
        );
        let md2 = adf_to_markdown(&doc).unwrap();
        assert!(
            !md2.contains("localId"),
            "no localId should appear in output: {md2}"
        );
    }

    #[test]
    fn layout_column_localid_stripped_when_option_set() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "layoutSection",
                "content": [{
                    "type": "layoutColumn",
                    "attrs": {"width": 50.0, "localId": "aabb112233cc"},
                    "content": [{"type": "paragraph", "content": [{"type": "text", "text": "Col"}]}]
                }]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
            ..Default::default()
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(!md.contains("localId"), "localId should be stripped: {md}");
    }

    #[test]
    fn layout_column_localid_flush_previous() {
        // Columns open without explicit `:::` close → flush-previous path
        let md = "::::layout\n:::column{width=50 localId=aabb112233cc}\nLeft.\n:::column{width=50 localId=ddeeff445566}\nRight.\n:::\n::::";
        let doc = markdown_to_adf(md).unwrap();
        let cols = doc.content[0].content.as_ref().unwrap();
        assert_eq!(
            cols[0].attrs.as_ref().unwrap()["localId"],
            "aabb112233cc",
            "flush-previous column should preserve localId"
        );
        assert_eq!(
            cols[1].attrs.as_ref().unwrap()["localId"],
            "ddeeff445566",
            "second column localId should be preserved"
        );
    }

    #[test]
    fn layout_column_localid_flush_last() {
        // Layout with no closing fence → column never explicitly closed → flush-last path
        let md = "::::layout\n:::column{width=50 localId=aabb112233cc}\nOnly column.";
        let doc = markdown_to_adf(md).unwrap();
        let cols = doc.content[0].content.as_ref().unwrap();
        assert_eq!(
            cols[0].attrs.as_ref().unwrap()["localId"],
            "aabb112233cc",
            "flush-last column should preserve localId"
        );
    }

    /// Issue #555: `layoutColumn` fractional `width` must round-trip byte-for-byte.
    #[test]
    fn issue_555_layout_column_fractional_width_roundtrip() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "layoutSection",
                "content": [
                    {
                        "type": "layoutColumn",
                        "attrs": {"width": 66.66},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "Wide"}]}]
                    },
                    {
                        "type": "layoutColumn",
                        "attrs": {"width": 33.34},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "Narrow"}]}]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("width=66.66"), "fractional width in md: {md}");
        assert!(md.contains("width=33.34"), "fractional width in md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let cols = rt.content[0].content.as_ref().unwrap();
        assert_eq!(cols[0].attrs.as_ref().unwrap()["width"], 66.66);
        assert_eq!(cols[1].attrs.as_ref().unwrap()["width"], 33.34);
    }

    /// Issue #555: `layoutColumn` 5/6 widths (`83.33`) round-trip without precision loss.
    #[test]
    fn issue_555_layout_column_five_sixths_width_roundtrip() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "layoutSection",
                "content": [
                    {
                        "type": "layoutColumn",
                        "attrs": {"width": 83.33},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "Wide"}]}]
                    },
                    {
                        "type": "layoutColumn",
                        "attrs": {"width": 16.67},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "Narrow"}]}]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let cols = rt.content[0].content.as_ref().unwrap();
        assert_eq!(cols[0].attrs.as_ref().unwrap()["width"], 83.33);
        assert_eq!(cols[1].attrs.as_ref().unwrap()["width"], 16.67);
    }

    /// Issue #555: `layoutColumn` integer widths must NOT be coerced to floats on round-trip.
    #[test]
    fn issue_555_layout_column_integer_width_preserved() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "layoutSection",
                "content": [
                    {
                        "type": "layoutColumn",
                        "attrs": {"width": 50},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "A"}]}]
                    },
                    {
                        "type": "layoutColumn",
                        "attrs": {"width": 50},
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "B"}]}]
                    }
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("width=50") && !md.contains("width=50."),
            "integer width should render without decimal: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let cols = rt.content[0].content.as_ref().unwrap();
        let w0 = &cols[0].attrs.as_ref().unwrap()["width"];
        assert!(
            w0.is_i64() || w0.is_u64(),
            "width should remain a JSON integer, got: {w0}"
        );
        assert_eq!(w0.as_i64(), Some(50));
    }

    /// Issue #555: `mediaSingle` integer `width` must NOT be coerced to a float on round-trip.
    #[test]
    fn issue_555_media_single_integer_width_preserved() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center", "width": 800},
                "content": [
                    {"type": "media", "attrs": {"type": "external", "url": "https://example.com/image.png"}}
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("width=800") && !md.contains("width=800."),
            "integer width should render without decimal: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let ms_attrs = rt.content[0].attrs.as_ref().unwrap();
        let w = &ms_attrs["width"];
        assert!(
            w.is_i64() || w.is_u64(),
            "mediaSingle width should remain JSON integer, got: {w}"
        );
        assert_eq!(w.as_i64(), Some(800));
    }

    /// Issue #555 (follow-up): fractional `mediaSingle` width (e.g. `66.5`, a
    /// percentage-based size common in Jira layouts) must survive `from-adf`
    /// instead of being silently dropped.
    #[test]
    fn issue_555_media_single_fractional_width_preserved() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center", "width": 66.5},
                "content": [
                    {"type": "media", "attrs": {"type": "external", "url": "https://example.com/diagram.png"}}
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("width=66.5"),
            "fractional width must appear in JFM: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let ms_attrs = rt.content[0].attrs.as_ref().unwrap();
        assert_eq!(ms_attrs["width"], 66.5);
    }

    /// Issue #555: `mediaSingle` float `width` must not be dropped during ADF→JFM→ADF.
    #[test]
    fn issue_555_media_single_float_width_preserved() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center", "width": 800.0},
                "content": [
                    {"type": "media", "attrs": {"type": "external", "url": "https://example.com/image.png"}}
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("width=800.0"),
            "float width should render with decimal: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let ms_attrs = rt.content[0].attrs.as_ref().unwrap();
        let w = &ms_attrs["width"];
        assert!(
            w.is_f64(),
            "mediaSingle float width should stay a JSON float, got: {w}"
        );
        assert_eq!(w.as_f64(), Some(800.0));
    }

    /// Issue #555: `mediaSingle` with `layout=wide` and integer width must round-trip.
    #[test]
    fn issue_555_media_single_wide_layout_integer_width_roundtrip() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "wide", "width": 1420},
                "content": [
                    {"type": "media", "attrs": {"type": "external", "url": "https://ex.com/x.png"}}
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let ms_attrs = rt.content[0].attrs.as_ref().unwrap();
        assert_eq!(ms_attrs["layout"], "wide");
        let w = &ms_attrs["width"];
        assert!(
            w.is_i64() || w.is_u64(),
            "mediaSingle width should remain JSON integer, got: {w}"
        );
        assert_eq!(w.as_i64(), Some(1420));
    }

    /// Issue #555: Confluence file-attachment `mediaSingle` with integer `mediaWidth`
    /// must round-trip without float coercion.
    #[test]
    fn issue_555_file_media_single_integer_width_preserved() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "wide", "width": 1420},
                "content": [
                    {"type": "media", "attrs": {"id": "abc-123", "type": "file", "collection": "col-1", "width": 1200, "height": 800}}
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let ms_attrs = rt.content[0].attrs.as_ref().unwrap();
        let ms_w = &ms_attrs["width"];
        assert!(ms_w.is_i64() || ms_w.is_u64(), "ms width: {ms_w}");
        assert_eq!(ms_w.as_i64(), Some(1420));
        let media = &rt.content[0].content.as_ref().unwrap()[0];
        let media_attrs = media.attrs.as_ref().unwrap();
        let mw = &media_attrs["width"];
        assert!(mw.is_i64() || mw.is_u64(), "media width: {mw}");
        assert_eq!(mw.as_i64(), Some(1200));
        let mh = &media_attrs["height"];
        assert!(mh.is_i64() || mh.is_u64(), "media height: {mh}");
        assert_eq!(mh.as_i64(), Some(800));
    }

    /// Issue #555: `fmt_numeric_attr` preserves the original integer/float JSON type.
    #[test]
    fn issue_555_fmt_numeric_attr_preserves_type() {
        assert_eq!(
            fmt_numeric_attr(&serde_json::json!(50)).as_deref(),
            Some("50")
        );
        assert_eq!(
            fmt_numeric_attr(&serde_json::json!(50.0)).as_deref(),
            Some("50.0")
        );
        assert_eq!(
            fmt_numeric_attr(&serde_json::json!(66.66)).as_deref(),
            Some("66.66")
        );
        assert_eq!(
            fmt_numeric_attr(&serde_json::json!(-5)).as_deref(),
            Some("-5")
        );
        assert_eq!(fmt_numeric_attr(&serde_json::json!("not a number")), None);
        // u64 values above i64::MAX exercise the u64-only branch.
        let big = serde_json::Value::Number(serde_json::Number::from(u64::MAX));
        assert_eq!(
            fmt_numeric_attr(&big).as_deref(),
            Some("18446744073709551615")
        );
        // Null is not a number.
        assert_eq!(fmt_numeric_attr(&serde_json::Value::Null), None);
    }

    /// Issue #555: `parse_numeric_attr` distinguishes integer vs float strings.
    #[test]
    fn issue_555_parse_numeric_attr_detects_type() {
        let v = parse_numeric_attr("800").unwrap();
        assert!(v.is_i64() || v.is_u64(), "'800' should parse as integer");
        assert_eq!(v.as_i64(), Some(800));

        let v = parse_numeric_attr("800.0").unwrap();
        assert!(v.is_f64(), "'800.0' should parse as float");
        assert_eq!(v.as_f64(), Some(800.0));

        let v = parse_numeric_attr("66.66").unwrap();
        assert!(v.is_f64());
        assert_eq!(v.as_f64(), Some(66.66));

        // Scientific notation is treated as float (matches JSON semantics).
        let v = parse_numeric_attr("1e2").unwrap();
        assert!(v.is_f64());
        assert_eq!(v.as_f64(), Some(100.0));
        let v = parse_numeric_attr("1E2").unwrap();
        assert!(v.is_f64());
        assert_eq!(v.as_f64(), Some(100.0));

        // Negative integer.
        let v = parse_numeric_attr("-42").unwrap();
        assert!(v.is_i64());
        assert_eq!(v.as_i64(), Some(-42));

        assert!(parse_numeric_attr("not-a-number").is_none());
        assert!(parse_numeric_attr("").is_none());
        assert!(parse_numeric_attr("1.2.3").is_none());
    }

    /// Issue #555: fractional `mediaSingle` width with non-default `layout=wide`
    /// must preserve both the layout and the fractional width through round-trip.
    #[test]
    fn issue_555_media_single_wide_layout_fractional_width_roundtrip() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "wide", "width": 83.33},
                "content": [
                    {"type": "media", "attrs": {"type": "external", "url": "https://ex.com/x.png"}}
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("layout=wide"), "layout must appear in md: {md}");
        assert!(md.contains("width=83.33"), "width must appear in md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let ms_attrs = rt.content[0].attrs.as_ref().unwrap();
        assert_eq!(ms_attrs["layout"], "wide");
        assert_eq!(ms_attrs["width"], 83.33);
    }

    /// Issue #555: fractional `mediaWidth` on a Confluence file-attachment
    /// `mediaSingle` must round-trip (exercises the file-branch `mediaWidth`
    /// render path, which previously used `as_u64` and silently dropped floats).
    #[test]
    fn issue_555_file_media_single_fractional_media_width_preserved() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "wide", "width": 66.5},
                "content": [
                    {"type": "media", "attrs": {"id": "abc", "type": "file", "collection": "c"}}
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("mediaWidth=66.5"), "mediaWidth in md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let ms_attrs = rt.content[0].attrs.as_ref().unwrap();
        assert_eq!(ms_attrs["width"], 66.5);
    }

    /// Issue #555: fractional inner `media` width/height on a file attachment
    /// must round-trip (exercises the file-branch inner `width`/`height` render
    /// path, which previously used `as_u64` and silently dropped floats).
    #[test]
    fn issue_555_file_media_fractional_inner_dimensions_preserved() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center"},
                "content": [
                    {"type": "media", "attrs": {"id": "abc", "type": "file", "collection": "c", "width": 1200.5, "height": 800.25}}
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("width=1200.5"), "width in md: {md}");
        assert!(md.contains("height=800.25"), "height in md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let media = &rt.content[0].content.as_ref().unwrap()[0];
        let attrs = media.attrs.as_ref().unwrap();
        assert_eq!(attrs["width"], 1200.5);
        assert_eq!(attrs["height"], 800.25);
    }

    #[test]
    fn decisions_list() {
        let md = ":::decisions\n- <> Use PostgreSQL\n- <> REST API\n:::";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "decisionList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);
        assert_eq!(items[0].attrs.as_ref().unwrap()["state"], "DECIDED");
    }

    // decisionItem is inline-only per ADF schema — its content must be
    // text/inline nodes, not a paragraph wrapper (issue #753).
    #[test]
    fn decision_item_content_is_inline_not_paragraph() {
        let md = ":::decisions\n- <> Use Rust\n:::";
        let doc = markdown_to_adf(md).unwrap();
        let items = doc.content[0].content.as_ref().unwrap();
        let first_child = &items[0].content.as_ref().unwrap()[0];
        assert_eq!(
            first_child.node_type, "text",
            "decisionItem must contain inline nodes directly, not a paragraph wrapper"
        );
        assert_eq!(first_child.text.as_deref(), Some("Use Rust"));
    }

    #[test]
    fn adf_decisions_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::decision_list(vec![AdfNode::decision_item(
                "DECIDED",
                vec![AdfNode::paragraph(vec![AdfNode::text("Use PostgreSQL")])],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":::decisions"));
        assert!(md.contains("- <> Use PostgreSQL"));
    }

    #[test]
    fn bodied_extension_container() {
        let md = ":::extension{type=com.forge key=my-macro}\nContent.\n:::";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "bodiedExtension");
        assert_eq!(
            doc.content[0].attrs.as_ref().unwrap()["extensionType"],
            "com.forge"
        );
    }

    #[test]
    fn adf_bodied_extension_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::bodied_extension(
                "com.forge",
                "my-macro",
                vec![AdfNode::paragraph(vec![AdfNode::text("Content.")])],
            )],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":::extension{type=com.forge key=my-macro}"));
        assert!(md.contains("Content."));
    }

    // ── Leaf block directive tests (Tier 3) ──────────────────────────

    #[test]
    fn leaf_block_card() {
        let doc = markdown_to_adf("::card[https://example.com/browse/PROJ-123]").unwrap();
        assert_eq!(doc.content[0].node_type, "blockCard");
        assert_eq!(
            doc.content[0].attrs.as_ref().unwrap()["url"],
            "https://example.com/browse/PROJ-123"
        );
    }

    #[test]
    fn adf_block_card_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::block_card("https://example.com/browse/PROJ-123")],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("::card[https://example.com/browse/PROJ-123]"));
    }

    #[test]
    fn round_trip_block_card() {
        let md = "::card[https://example.com/browse/PROJ-123]\n";
        let doc = markdown_to_adf(md).unwrap();
        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains("::card[https://example.com/browse/PROJ-123]"));
    }

    #[test]
    fn leaf_embed_card() {
        let doc =
            markdown_to_adf("::embed[https://figma.com/file/abc]{layout=wide width=80}").unwrap();
        assert_eq!(doc.content[0].node_type, "embedCard");
        let attrs = doc.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["url"], "https://figma.com/file/abc");
        assert_eq!(attrs["layout"], "wide");
        assert_eq!(attrs["width"], 80.0);
    }

    #[test]
    fn leaf_embed_card_with_original_height() {
        let doc = markdown_to_adf(
            "::embed[https://example.com]{layout=center originalHeight=732 width=100}",
        )
        .unwrap();
        assert_eq!(doc.content[0].node_type, "embedCard");
        let attrs = doc.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["url"], "https://example.com");
        assert_eq!(attrs["layout"], "center");
        assert_eq!(attrs["originalHeight"], 732.0);
        assert_eq!(attrs["width"], 100.0);
    }

    #[test]
    fn adf_embed_card_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::embed_card(
                "https://figma.com/file/abc",
                Some("wide"),
                None,
                Some(80.0),
            )],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("::embed[https://figma.com/file/abc]{layout=wide width=80}"));
    }

    #[test]
    fn adf_embed_card_original_height_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::embed_card(
                "https://example.com",
                Some("center"),
                Some(732.0),
                Some(100.0),
            )],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("::embed[https://example.com]{layout=center originalHeight=732 width=100}"),
            "expected originalHeight and width in md: {md}"
        );
    }

    #[test]
    fn embed_card_roundtrip_with_all_attrs() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{
            "type":"embedCard",
            "attrs":{"layout":"center","originalHeight":732.0,"url":"https://example.com","width":100.0}
        }]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("originalHeight=732"),
            "originalHeight missing from md: {md}"
        );
        assert!(md.contains("width=100"), "width missing from md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let attrs = rt.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["originalHeight"], 732.0);
        assert_eq!(attrs["width"], 100.0);
        assert_eq!(attrs["layout"], "center");
        assert_eq!(attrs["url"], "https://example.com");
    }

    #[test]
    fn embed_card_fractional_dimensions() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::embed_card(
                "https://example.com",
                Some("center"),
                Some(732.5),
                Some(99.9),
            )],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("originalHeight=732.5"),
            "fractional originalHeight missing: {md}"
        );
        assert!(md.contains("width=99.9"), "fractional width missing: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let attrs = rt.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["originalHeight"], 732.5);
        assert_eq!(attrs["width"], 99.9);
    }

    #[test]
    fn embed_card_integer_width_in_json() {
        // JSON integer (not float) should also be extracted via as_f64()
        let adf_json = r#"{"version":1,"type":"doc","content":[{
            "type":"embedCard",
            "attrs":{"url":"https://example.com","width":100}
        }]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("width=100"),
            "integer width missing from md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(rt.content[0].attrs.as_ref().unwrap()["width"], 100.0);
    }

    #[test]
    fn embed_card_only_original_height() {
        // originalHeight without width
        let adf_json = r#"{"version":1,"type":"doc","content":[{
            "type":"embedCard",
            "attrs":{"url":"https://example.com","originalHeight":500.0}
        }]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("originalHeight=500"),
            "originalHeight missing: {md}"
        );
        assert!(!md.contains("width="), "width should not appear: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let attrs = rt.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["originalHeight"], 500.0);
        assert!(attrs.get("width").is_none());
    }

    #[test]
    fn leaf_void_extension() {
        let doc = markdown_to_adf("::extension{type=com.atlassian.macro key=jira-chart}").unwrap();
        assert_eq!(doc.content[0].node_type, "extension");
        assert_eq!(
            doc.content[0].attrs.as_ref().unwrap()["extensionType"],
            "com.atlassian.macro"
        );
        assert_eq!(
            doc.content[0].attrs.as_ref().unwrap()["extensionKey"],
            "jira-chart"
        );
    }

    #[test]
    fn adf_void_extension_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::extension(
                "com.atlassian.macro",
                "jira-chart",
                None,
            )],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("::extension{type=com.atlassian.macro key=jira-chart}"));
    }

    // ── Bare URL autolink tests ──────────────────────────────────────

    #[test]
    fn bare_url_autolink() {
        let doc = markdown_to_adf("Visit https://example.com today").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some("Visit "));
        assert_eq!(content[1].node_type, "inlineCard");
        assert_eq!(
            content[1].attrs.as_ref().unwrap()["url"],
            "https://example.com"
        );
        assert_eq!(content[2].text.as_deref(), Some(" today"));
    }

    #[test]
    fn bare_url_strips_trailing_punctuation() {
        let doc = markdown_to_adf("See https://example.com.").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(
            content[1].attrs.as_ref().unwrap()["url"],
            "https://example.com"
        );
    }

    #[test]
    fn bare_url_round_trip() {
        let doc = markdown_to_adf("Visit https://example.com/path today").unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":card[https://example.com/path]"));
    }

    // ── Issue #475: plain-text URL must not become inlineCard ─────────

    #[test]
    fn plain_text_url_round_trips_as_text() {
        // A text node whose content is a bare URL (no link mark) must
        // survive ADF→JFM→ADF as a text node, not an inlineCard.
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [
                    {"type": "text", "text": "https://example.com/some/path/to/resource"}
                ]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should be a single node");
        assert_eq!(content[0].node_type, "text");
        assert_eq!(
            content[0].text.as_deref(),
            Some("https://example.com/some/path/to/resource")
        );
    }

    #[test]
    fn url_text_with_link_mark_round_trips_as_text_node() {
        // Issue #523: A text node whose content is a URL with a link mark
        // (href differs by trailing slash) must round-trip as text+link,
        // not become an inlineCard.
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [{
                    "type": "text",
                    "text": "https://octopz.example.com",
                    "marks": [{"type": "link", "attrs": {"href": "https://octopz.example.com/"}}]
                }]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should be a single node");
        assert_eq!(content[0].node_type, "text", "must be text, not inlineCard");
        assert_eq!(
            content[0].text.as_deref(),
            Some("https://octopz.example.com")
        );
        let mark = &content[0].marks.as_ref().unwrap()[0];
        assert_eq!(mark.mark_type, "link");
        assert_eq!(
            mark.attrs.as_ref().unwrap()["href"],
            "https://octopz.example.com/"
        );
    }

    #[test]
    fn url_text_with_exact_link_mark_round_trips() {
        // Variant: text and href are identical (no trailing slash difference).
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [{
                    "type": "text",
                    "text": "https://example.com/path",
                    "marks": [{"type": "link", "attrs": {"href": "https://example.com/path"}}]
                }]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should be a single node");
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[0].text.as_deref(), Some("https://example.com/path"));
        let mark = &content[0].marks.as_ref().unwrap()[0];
        assert_eq!(mark.mark_type, "link");
    }

    #[test]
    fn plain_text_url_amid_text_round_trips() {
        // URL embedded in surrounding text, without link mark.
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [
                    {"type": "text", "text": "see https://example.com for info"}
                ]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].node_type, "text");
        assert_eq!(
            content[0].text.as_deref(),
            Some("see https://example.com for info")
        );
    }

    #[test]
    fn plain_text_multiple_urls_round_trips() {
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [
                    {"type": "text", "text": "http://a.com and https://b.com"}
                ]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].node_type, "text");
        assert_eq!(
            content[0].text.as_deref(),
            Some("http://a.com and https://b.com")
        );
    }

    #[test]
    fn plain_text_http_prefix_no_url_unchanged() {
        // "http" without "://" should not be escaped or altered.
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [
                    {"type": "text", "text": "the http header is important"}
                ]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            content[0].text.as_deref(),
            Some("the http header is important")
        );
    }

    #[test]
    fn linked_url_text_round_trips() {
        // A text node that is exactly a URL with a link mark pointing to the
        // same URL must round-trip as a single text node with a link mark
        // (no inlineCard, no lost/split content).
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [{
                    "type": "text",
                    "text": "https://example.com",
                    "marks": [{"type": "link", "attrs": {"href": "https://example.com"}}]
                }]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[0].text.as_deref(), Some("https://example.com"));
        let mark = &content[0].marks.as_ref().unwrap()[0];
        assert_eq!(mark.mark_type, "link");
        assert_eq!(mark.attrs.as_ref().unwrap()["href"], "https://example.com");
    }

    // ── Issue #493: bracket-link ambiguity ─────────────────────────────

    #[test]
    fn escape_link_brackets_unit() {
        assert_eq!(escape_link_brackets("hello"), "hello");
        assert_eq!(escape_link_brackets("["), "\\[");
        assert_eq!(escape_link_brackets("]"), "\\]");
        assert_eq!(escape_link_brackets("[PROJ-456]"), "\\[PROJ-456\\]");
        assert_eq!(escape_link_brackets("a[b]c"), "a\\[b\\]c");
    }

    #[test]
    fn bracket_text_with_link_mark_escapes_brackets() {
        // A text node whose content is "[" with a link mark should escape
        // the bracket so it does not create ambiguous markdown link syntax.
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "[",
                vec![AdfMark::link("https://example.com")],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "[\\[](https://example.com)");
    }

    #[test]
    fn bracket_text_with_link_mark_round_trips() {
        // Issue #493 reproducer: adjacent text nodes sharing a link mark
        // where the first node's content is "[".
        let adf_json = r#"{
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "paragraph",
                "content": [
                    {
                        "type": "text",
                        "text": "[",
                        "marks": [{"type": "link", "attrs": {"href": "https://example.com/ticket/123"}}]
                    },
                    {
                        "type": "text",
                        "text": "PROJ-456] Fix the auth bug",
                        "marks": [
                            {"type": "underline"},
                            {"type": "link", "attrs": {"href": "https://example.com/ticket/123"}}
                        ]
                    }
                ]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();

        // The markdown should contain escaped brackets inside the link
        assert!(jfm.contains("\\["), "opening bracket should be escaped");

        // Round-trip: both text nodes must survive with link marks
        let rt = markdown_to_adf(&jfm).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();

        // All text nodes that were part of the link must still carry a link mark
        let link_nodes: Vec<_> = content
            .iter()
            .filter(|n| {
                n.marks
                    .as_ref()
                    .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "link"))
            })
            .collect();
        assert!(
            !link_nodes.is_empty(),
            "link mark must be preserved on round-trip"
        );

        // The combined text across all nodes should contain the original content
        let all_text: String = content.iter().filter_map(|n| n.text.as_deref()).collect();
        assert!(
            all_text.contains('['),
            "literal '[' must survive round-trip"
        );
        assert!(
            all_text.contains("PROJ-456]"),
            "continuation text must survive round-trip"
        );
    }

    #[test]
    fn closing_bracket_in_link_text_round_trips() {
        // A text node containing "]" inside a link should be escaped and
        // survive round-trip without breaking the link syntax.
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "item]",
                vec![AdfMark::link("https://example.com")],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "[item\\]](https://example.com)");

        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some("item]"));
        assert!(content[0]
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .any(|m| m.mark_type == "link"));
    }

    #[test]
    fn brackets_in_link_text_round_trip() {
        // Text containing both [ and ] inside a link should round-trip.
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "[PROJ-123]",
                vec![AdfMark::link("https://example.com")],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "[\\[PROJ-123\\]](https://example.com)");

        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some("[PROJ-123]"));
        assert!(content[0]
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .any(|m| m.mark_type == "link"));
    }

    #[test]
    fn plain_text_brackets_not_escaped() {
        // Brackets in plain text (no link mark) must NOT be escaped.
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text(
                "see [PROJ-123] for details",
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "see [PROJ-123] for details");
    }

    #[test]
    fn link_with_no_brackets_unchanged() {
        // A normal link with no brackets in the text should be unaffected.
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "click here",
                vec![AdfMark::link("https://example.com")],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "[click here](https://example.com)");
    }

    // ── Issue #551: URL brackets in link-marked text round-trip ────────

    #[test]
    fn url_with_brackets_as_link_text_round_trips() {
        // Issue #551: a text node whose content is a URL containing square
        // brackets and which carries a link mark must round-trip verbatim.
        // Previously the URL-as-link-text fast path preserved `\[` and `\]`
        // escapes in the emitted text, corrupting the text content.
        let href = "https://example.com/dashboard?filter[0]=active&filter[1]=pending";
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                href,
                vec![AdfMark::link(href)],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[0].text.as_deref(), Some(href));
        let mark = &content[0].marks.as_ref().unwrap()[0];
        assert_eq!(mark.mark_type, "link");
        assert_eq!(mark.attrs.as_ref().unwrap()["href"], href);
    }

    #[test]
    fn url_with_brackets_embedded_in_link_text_round_trips() {
        // Issue #551 updated reproducer: a link-marked text node containing
        // both prose and an embedded URL with brackets must round-trip
        // without the embedded URL being detected as a bare-URL inlineCard
        // or the brackets terminating the link syntax early.  This mirrors
        // the comment reproducer which uses an ellipsis character between
        // the brackets and a distinct href value.
        let href = "https://example.com/logs?query=service%20environment%20data&from=100&to=200";
        let text =
            "See the logs: https://example.com/logs?query=service[\u{2026}]data&from=100&to=200";
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                text,
                vec![AdfMark::link(href)],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "content split unexpectedly: {content:?}");
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[0].text.as_deref(), Some(text));
        let mark = &content[0].marks.as_ref().unwrap()[0];
        assert_eq!(mark.mark_type, "link");
        assert_eq!(mark.attrs.as_ref().unwrap()["href"], href);
    }

    #[test]
    fn url_with_brackets_plain_text_round_trips() {
        // Issue #551 original reproducer: plain text with an embedded URL
        // that contains square brackets must round-trip verbatim.
        let text =
            "See the dashboard: https://example.com/dashboard?filter[0]=active&filter[1]=pending";
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text(text)])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[0].text.as_deref(), Some(text));
        assert!(content[0].marks.is_none());
    }

    #[test]
    fn url_with_link_mark_embedded_no_brackets_round_trips() {
        // Regression guard: embedding a bare URL inside link-marked text
        // (no brackets) must not create an inlineCard on round-trip.
        let href = "https://example.com/";
        let text = "See https://example.com/ for more";
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                text,
                vec![AdfMark::link(href)],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[0].text.as_deref(), Some(text));
        let mark = &content[0].marks.as_ref().unwrap()[0];
        assert_eq!(mark.mark_type, "link");
        assert_eq!(mark.attrs.as_ref().unwrap()["href"], href);
    }

    #[test]
    fn nested_brackets_in_link_text_round_trip() {
        // Regression guard: nested brackets in link-marked text must
        // round-trip without corrupting the content.
        let href = "https://x.com";
        let text = "foo [a[b]c] bar";
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                text,
                vec![AdfMark::link(href)],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[0].text.as_deref(), Some(text));
    }

    #[test]
    fn bracket_url_bracket_in_link_text_round_trips() {
        // Regression guard: a link-marked text containing brackets on both
        // sides of an embedded URL (with brackets of its own) must
        // round-trip intact.  This exercises interaction between the
        // URL-as-link-text fast path, bare-URL detection, and bracket
        // escape handling.
        let href = "https://y.com";
        let text = "[see https://x.com/a[0]=1 here]";
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                text,
                vec![AdfMark::link(href)],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[0].text.as_deref(), Some(text));
        let mark = &content[0].marks.as_ref().unwrap()[0];
        assert_eq!(mark.mark_type, "link");
        assert_eq!(mark.attrs.as_ref().unwrap()["href"], href);
    }

    #[test]
    fn escape_bare_urls_applied_inside_link_text() {
        // White-box: when a text node carries a link mark, bare URLs in the
        // text must still be escaped with `\h` so the parser does not
        // auto-link them into an inlineCard inside the link.  Without this,
        // round-trip of link-marked prose containing an embedded URL
        // silently corrupts on re-parse (issue #551).
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "See https://example.com/",
                vec![AdfMark::link("https://target.example.com/")],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(r"\https://example.com/"),
            "bare URL inside link text must be escaped, got: {md}"
        );
    }

    #[test]
    fn inline_card_still_round_trips() {
        // An actual inlineCard node should still round-trip correctly
        // (it uses :card[url] syntax, not bare URL).
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [
                    {"type": "inlineCard", "attrs": {"url": "https://example.com/page"}}
                ]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        assert!(jfm.contains(":card[https://example.com/page]"));
        let roundtripped = markdown_to_adf(&jfm).unwrap();
        let content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].node_type, "inlineCard");
        assert_eq!(
            content[0].attrs.as_ref().unwrap()["url"],
            "https://example.com/page"
        );
    }

    // ── Issue #553: inlineCard round-trip with problematic URLs ───────

    #[test]
    fn url_safe_in_bracket_content_balanced() {
        // Balanced brackets — depth never returns to zero mid-string.
        assert!(url_safe_in_bracket_content("https://example.com"));
        assert!(url_safe_in_bracket_content("https://example.com/[id]"));
        assert!(url_safe_in_bracket_content("a[b[c]d]e"));
        assert!(url_safe_in_bracket_content(""));
    }

    #[test]
    fn url_safe_in_bracket_content_unbalanced() {
        // A `]` with no prior `[` would close `:card[...]` early.
        assert!(!url_safe_in_bracket_content("a]b"));
        assert!(!url_safe_in_bracket_content("https://example.com/path]end"));
        // Embedded newline breaks inline directive parsing.
        assert!(!url_safe_in_bracket_content("a\nb"));
    }

    #[test]
    fn inline_card_url_with_closing_bracket_round_trip() {
        // Issue #553 defensive fix: a URL that contains `]` (unbalanced) must
        // round-trip without truncation.  The renderer must switch to the
        // quoted attribute form `:card[]{url="..."}` so the parser's
        // depth-based bracket matcher does not terminate the directive early.
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [
                    {"type": "text", "text": "See: "},
                    {"type": "inlineCard", "attrs": {"url": "https://example.com/path]end/?q=1"}}
                ]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        assert!(
            jfm.contains(r#":card[]{url="https://example.com/path]end/?q=1"}"#),
            "expected attr-form for URL with `]`, got: {jfm}"
        );
        let rt = markdown_to_adf(&jfm).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 2, "expected 2 inline nodes, got {content:?}");
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[0].text.as_deref(), Some("See: "));
        assert_eq!(content[1].node_type, "inlineCard");
        assert_eq!(
            content[1].attrs.as_ref().unwrap()["url"],
            "https://example.com/path]end/?q=1"
        );
    }

    #[test]
    fn inline_card_url_with_closing_bracket_preserves_local_id() {
        // Attr-form `:card[]{url=... localId=...}` must preserve localId too.
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [
                    {"type": "inlineCard", "attrs": {
                        "url": "https://example.com/a]b",
                        "localId": "c-77"
                    }}
                ]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        assert!(
            jfm.contains(r#"url="https://example.com/a]b""#),
            "jfm: {jfm}"
        );
        assert!(jfm.contains("localId=c-77"), "jfm: {jfm}");
        let rt = markdown_to_adf(&jfm).unwrap();
        let card = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(card.node_type, "inlineCard");
        assert_eq!(
            card.attrs.as_ref().unwrap()["url"],
            "https://example.com/a]b"
        );
        assert_eq!(card.attrs.as_ref().unwrap()["localId"], "c-77");
    }

    #[test]
    fn block_card_url_with_closing_bracket_round_trip() {
        // Same defensive fix applied to the leaf directive `::card`.
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [
                {"type": "blockCard", "attrs": {"url": "https://example.com/path]end"}}
            ]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        assert!(
            jfm.contains(r#"::card[]{url="https://example.com/path]end"}"#),
            "expected attr-form for blockCard with `]`, got: {jfm}"
        );
        let rt = markdown_to_adf(&jfm).unwrap();
        assert_eq!(rt.content[0].node_type, "blockCard");
        assert_eq!(
            rt.content[0].attrs.as_ref().unwrap()["url"],
            "https://example.com/path]end"
        );
    }

    #[test]
    fn block_card_attr_form_parses_without_renderer() {
        // Directly parsing `::card[]{url="..."}` exercises the attr-URL
        // fallback in the leaf-directive dispatcher (covers the `url` lookup
        // path independently of the ADF→JFM renderer).
        let doc = markdown_to_adf(r#"::card[]{url="https://example.com/a"}"#).unwrap();
        assert_eq!(doc.content[0].node_type, "blockCard");
        assert_eq!(
            doc.content[0].attrs.as_ref().unwrap()["url"],
            "https://example.com/a"
        );
    }

    #[test]
    fn block_card_attr_form_url_overrides_content() {
        // When both bracket-content and `url=` attribute are present on
        // `::card`, the attribute wins.  Mirrors the inline-directive
        // behaviour and keeps hand-edited JFM forgiving.
        let doc =
            markdown_to_adf(r#"::card[https://old.example.com]{url="https://new.example.com"}"#)
                .unwrap();
        assert_eq!(doc.content[0].node_type, "blockCard");
        assert_eq!(
            doc.content[0].attrs.as_ref().unwrap()["url"],
            "https://new.example.com"
        );
    }

    #[test]
    fn block_card_attr_form_with_layout_and_width() {
        // Attr-URL form combined with layout/width attrs — ensures all
        // sibling attrs still pass through after the URL lookup.
        let doc =
            markdown_to_adf(r#"::card[]{url="https://example.com/a]b" layout=wide width=80}"#)
                .unwrap();
        let attrs = doc.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["url"], "https://example.com/a]b");
        assert_eq!(attrs["layout"], "wide");
        assert_eq!(attrs["width"], 80);
    }

    #[test]
    fn inline_card_issue_553_reproducer() {
        // Verbatim reproducer from issue #553: an inlineCard in a paragraph
        // with preceding text must round-trip as an inlineCard, not degrade to
        // a text node with a link mark.
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [
                    {"type": "text", "text": "See the related page: "},
                    {"type": "inlineCard", "attrs": {
                        "url": "https://example.atlassian.net/wiki/spaces/ENG/pages/12345678"
                    }}
                ]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let rt = markdown_to_adf(&jfm).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 2);
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[1].node_type, "inlineCard");
        assert_eq!(
            content[1].attrs.as_ref().unwrap()["url"],
            "https://example.atlassian.net/wiki/spaces/ENG/pages/12345678"
        );
    }

    #[test]
    fn inline_card_attr_form_parses_even_without_renderer() {
        // Directly parsing `:card[]{url="..."}` should yield an inlineCard.
        let doc = markdown_to_adf(r#":card[]{url="https://example.com/a"}"#).unwrap();
        let node = &doc.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.node_type, "inlineCard");
        assert_eq!(node.attrs.as_ref().unwrap()["url"], "https://example.com/a");
    }

    #[test]
    fn inline_card_attr_form_url_overrides_content() {
        // When both bracket-content and `url=` attr are present, attr wins.
        // This keeps the parser forgiving of hand-edited JFM where a user
        // copied an old bracket form but added attrs.
        let doc =
            markdown_to_adf(r#":card[https://old.example.com]{url="https://new.example.com"}"#)
                .unwrap();
        let node = &doc.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.node_type, "inlineCard");
        assert_eq!(
            node.attrs.as_ref().unwrap()["url"],
            "https://new.example.com"
        );
    }

    // ── Issue #553 (updated): mark-wrapped URL must not become inlineCard ──

    #[test]
    fn url_with_link_and_underline_marks_round_trip() {
        // Issue #553 (updated reproducer): a `text` node whose content is a
        // URL and that carries both `link` and `underline` marks must round-
        // trip as text+marks, not be promoted to an `inlineCard`.
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [
                    {"type": "text", "text": "See results at: "},
                    {"type": "text",
                     "text": "https://example.com/projects/abc123/analytics",
                     "marks": [
                        {"type": "link", "attrs": {"href": "https://example.com/projects/abc123/analytics"}},
                        {"type": "underline"}
                     ]},
                    {"type": "text", "text": " for details."}
                ]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let rt = markdown_to_adf(&jfm).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            content.len(),
            3,
            "expected 3 inline nodes, got: {content:?}"
        );
        assert_eq!(content[0].node_type, "text");
        assert_eq!(
            content[1].node_type, "text",
            "must stay text, not inlineCard"
        );
        assert_eq!(
            content[1].text.as_deref(),
            Some("https://example.com/projects/abc123/analytics")
        );
        let mark_types: Vec<&str> = content[1]
            .marks
            .as_deref()
            .unwrap_or(&[])
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(mark_types, vec!["link", "underline"], "marks lost");
        assert_eq!(content[2].node_type, "text");
    }

    #[test]
    fn url_inside_bracketed_span_stays_text() {
        // `[URL]{underline}` in JFM means "underline this URL text", not
        // "create a smart link that's underlined".  The nested parse_inline
        // call must not auto-promote the bare URL to an inlineCard.
        let doc = markdown_to_adf("[https://example.com]{underline}").unwrap();
        let node = &doc.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.node_type, "text");
        assert_eq!(node.text.as_deref(), Some("https://example.com"));
        let mark_types: Vec<&str> = node
            .marks
            .as_deref()
            .unwrap_or(&[])
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(mark_types, vec!["underline"]);
    }

    #[test]
    fn url_inside_emphasis_stays_text() {
        // Bold, italic, and strike-wrapped URLs should remain as text nodes,
        // not get promoted to inlineCards by the nested inline parser.
        for (md, mark) in [
            ("**https://example.com**", "strong"),
            ("*https://example.com*", "em"),
            ("~~https://example.com~~", "strike"),
        ] {
            let doc = markdown_to_adf(md).unwrap();
            let node = &doc.content[0].content.as_ref().unwrap()[0];
            assert_eq!(node.node_type, "text", "md={md}: must be text");
            assert_eq!(node.text.as_deref(), Some("https://example.com"));
            let mark_types: Vec<&str> = node
                .marks
                .as_deref()
                .unwrap_or(&[])
                .iter()
                .map(|m| m.mark_type.as_str())
                .collect();
            assert_eq!(mark_types, vec![mark], "md={md}: wrong marks");
        }
    }

    #[test]
    fn url_inside_span_directive_stays_text() {
        // `:span[URL]{color=red}` should not promote the URL to an inlineCard.
        let doc = markdown_to_adf(":span[https://example.com]{color=red}").unwrap();
        let node = &doc.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.node_type, "text");
        assert_eq!(node.text.as_deref(), Some("https://example.com"));
        let mark = &node.marks.as_ref().unwrap()[0];
        assert_eq!(mark.mark_type, "textColor");
    }

    #[test]
    fn url_as_link_text_with_underline_after_link_mark_order() {
        // Reverse mark order — underline appears BEFORE link in the ADF array.
        // The JFM form is `[[text](url)]{underline}`; the nested parser must
        // still keep the URL as plain text.
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "paragraph",
                "content": [
                    {"type": "text",
                     "text": "https://example.com",
                     "marks": [
                        {"type": "underline"},
                        {"type": "link", "attrs": {"href": "https://example.com"}}
                     ]}
                ]
            }]
        }"#;
        let adf: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let jfm = adf_to_markdown(&adf).unwrap();
        let rt = markdown_to_adf(&jfm).unwrap();
        let node = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.node_type, "text", "must stay text, got: {node:?}");
        assert_eq!(node.text.as_deref(), Some("https://example.com"));
        let mark_types: Vec<&str> = node
            .marks
            .as_deref()
            .unwrap_or(&[])
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(mark_types, vec!["underline", "link"]);
    }

    #[test]
    fn bare_url_at_top_level_still_becomes_inline_card() {
        // Regression guard: the suppression only applies inside mark-wrapping
        // constructs.  A bare URL in ordinary paragraph text must still be
        // detected and promoted to an inlineCard.
        let doc = markdown_to_adf("Visit https://example.com today").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 3);
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[1].node_type, "inlineCard");
        assert_eq!(
            content[1].attrs.as_ref().unwrap()["url"],
            "https://example.com"
        );
        assert_eq!(content[2].node_type, "text");
    }

    // ── Block-level attribute marks (Tier 5/6) ───────────────────────

    #[test]
    fn paragraph_align_center() {
        let md = "Centered text.\n{align=center}";
        let doc = markdown_to_adf(md).unwrap();
        let marks = doc.content[0].marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "alignment");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["align"], "center");
    }

    #[test]
    fn adf_alignment_to_markdown() {
        let mut node = AdfNode::paragraph(vec![AdfNode::text("Centered.")]);
        node.marks = Some(vec![AdfMark::alignment("center")]);
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![node],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("Centered."));
        assert!(md.contains("{align=center}"));
    }

    #[test]
    fn round_trip_alignment() {
        let md = "Centered.\n{align=center}\n";
        let doc = markdown_to_adf(md).unwrap();
        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains("{align=center}"));
    }

    #[test]
    fn paragraph_indent() {
        let md = "Indented.\n{indent=2}";
        let doc = markdown_to_adf(md).unwrap();
        let marks = doc.content[0].marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "indentation");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["level"], 2);
    }

    #[test]
    fn code_block_breakout() {
        let md = "```python\ndef f(): pass\n```\n{breakout=wide}";
        let doc = markdown_to_adf(md).unwrap();
        let marks = doc.content[0].marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "breakout");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["mode"], "wide");
        assert!(marks[0].attrs.as_ref().unwrap().get("width").is_none());
    }

    #[test]
    fn code_block_breakout_with_width() {
        let md = "```python\ndef f(): pass\n```\n{breakout=wide breakoutWidth=1200}";
        let doc = markdown_to_adf(md).unwrap();
        let marks = doc.content[0].marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "breakout");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["mode"], "wide");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["width"], 1200);
    }

    #[test]
    fn adf_breakout_to_markdown() {
        let mut node = AdfNode::code_block(Some("python"), "pass");
        node.marks = Some(vec![AdfMark::breakout("wide", None)]);
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![node],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("{breakout=wide}"));
        assert!(!md.contains("breakoutWidth"));
    }

    #[test]
    fn adf_breakout_with_width_to_markdown() {
        let mut node = AdfNode::code_block(Some("python"), "pass");
        node.marks = Some(vec![AdfMark::breakout("wide", Some(1200))]);
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![node],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("breakout=wide"));
        assert!(md.contains("breakoutWidth=1200"));
    }

    #[test]
    fn breakout_width_round_trip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{
            "type":"codeBlock",
            "attrs":{"language":"text"},
            "marks":[{"type":"breakout","attrs":{"mode":"wide","width":1200}}],
            "content":[{"type":"text","text":"some code"}]
        }]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("breakout=wide"));
        assert!(md.contains("breakoutWidth=1200"));
        let round_tripped = markdown_to_adf(&md).unwrap();
        let marks = round_tripped.content[0].marks.as_ref().unwrap();
        let breakout = marks.iter().find(|m| m.mark_type == "breakout").unwrap();
        assert_eq!(breakout.attrs.as_ref().unwrap()["mode"], "wide");
        assert_eq!(breakout.attrs.as_ref().unwrap()["width"], 1200);
    }

    // ── Attribute extensions — media & table (Tier 5) ────────────────

    #[test]
    fn image_with_layout_attrs() {
        let doc = markdown_to_adf("![alt](url){layout=wide width=80}").unwrap();
        let node = &doc.content[0];
        assert_eq!(node.node_type, "mediaSingle");
        let attrs = node.attrs.as_ref().unwrap();
        assert_eq!(attrs["layout"], "wide");
        assert_eq!(attrs["width"], 80);
    }

    #[test]
    fn adf_image_with_layout_to_markdown() {
        let mut node = AdfNode::media_single("url", Some("alt"));
        node.attrs.as_mut().unwrap()["layout"] = serde_json::json!("wide");
        node.attrs.as_mut().unwrap()["width"] = serde_json::json!(80);
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![node],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("![alt](url){layout=wide width=80}"));
    }

    #[test]
    fn table_with_layout_attrs() {
        let md = "| H |\n| --- |\n| C |\n{layout=wide numbered}";
        let doc = markdown_to_adf(md).unwrap();
        let table = &doc.content[0];
        assert_eq!(table.node_type, "table");
        let attrs = table.attrs.as_ref().unwrap();
        assert_eq!(attrs["layout"], "wide");
        assert_eq!(attrs["isNumberColumnEnabled"], true);
    }

    #[test]
    fn adf_table_with_attrs_to_markdown() {
        let mut table = AdfNode::table(vec![
            AdfNode::table_row(vec![AdfNode::table_header(vec![AdfNode::paragraph(vec![
                AdfNode::text("H"),
            ])])]),
            AdfNode::table_row(vec![AdfNode::table_cell(vec![AdfNode::paragraph(vec![
                AdfNode::text("C"),
            ])])]),
        ]);
        table.attrs = Some(serde_json::json!({"layout": "wide", "isNumberColumnEnabled": true}));
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![table],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("{layout=wide numbered}"));
    }

    // ── Attribute extensions — inline marks (Tier 5) ─────────────────

    #[test]
    fn underline_bracketed_span() {
        let doc = markdown_to_adf("This is [underlined text]{underline} here.").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content[1].text.as_deref(), Some("underlined text"));
        let marks = content[1].marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "underline");
    }

    #[test]
    fn adf_underline_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "underlined",
                vec![AdfMark::underline()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("[underlined]{underline}"));
    }

    #[test]
    fn round_trip_underline() {
        let md = "This is [underlined text]{underline} here.\n";
        let doc = markdown_to_adf(md).unwrap();
        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains("[underlined text]{underline}"));
    }

    #[test]
    fn mark_ordering_underline_strong_preserved() {
        // Issue #383: mark ordering was non-deterministic
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"bold and underlined","marks":[{"type":"underline"},{"type":"strong"}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["underline", "strong"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_link_strong_preserved() {
        // Issue #403: link+strong mark order was swapped on round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"bold link","marks":[
            {"type":"link","attrs":{"href":"https://example.com"}},
            {"type":"strong"}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["link", "strong"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_link_textcolor_preserved() {
        // Issue #403 comment: link+textColor mark order was swapped on round-trip
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"red link","marks":[
            {"type":"link","attrs":{"href":"https://example.com"}},
            {"type":"textColor","attrs":{"color":"#ff0000"}}
          ]}
        ]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["link", "textColor"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_link_em_preserved() {
        // Issue #403: link+em mark order should be preserved
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"italic link","marks":[
            {"type":"link","attrs":{"href":"https://example.com"}},
            {"type":"em"}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["link", "em"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_link_strike_preserved() {
        // Issue #403: link+strike mark order should be preserved
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"struck link","marks":[
            {"type":"link","attrs":{"href":"https://example.com"}},
            {"type":"strike"}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["link", "strike"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_strong_link_preserved() {
        // Issue #403: [strong, link] order must also be preserved (reverse direction)
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"bold link","marks":[
            {"type":"strong"},
            {"type":"link","attrs":{"href":"https://example.com"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["strong", "link"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_em_link_preserved() {
        // Issue #403: [em, link] order must also be preserved
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"italic link","marks":[
            {"type":"em"},
            {"type":"link","attrs":{"href":"https://example.com"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["em", "link"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_strike_link_preserved() {
        // Issue #403: [strike, link] order must also be preserved
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"struck link","marks":[
            {"type":"strike"},
            {"type":"link","attrs":{"href":"https://example.com"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["strike", "link"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_underline_link_preserved() {
        // Issue #403: [underline, link] order must be preserved
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"click here","marks":[
            {"type":"underline"},
            {"type":"link","attrs":{"href":"https://example.com"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["underline", "link"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_textcolor_link_preserved() {
        // Issue #403: [textColor, link] order must be preserved
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"red link","marks":[
            {"type":"textColor","attrs":{"color":"#ff0000"}},
            {"type":"link","attrs":{"href":"https://example.com"}}
          ]}
        ]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["textColor", "link"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_link_underline_preserved() {
        // Issue #403: [link, underline] order must be preserved (link wraps bracketed span)
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"click here","marks":[
            {"type":"link","attrs":{"href":"https://example.com"}},
            {"type":"underline"}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // Link should wrap the underline bracketed span: [[click here]{underline}](url)
        assert!(
            md.contains("](https://example.com)"),
            "should have link: {md}"
        );
        assert!(md.contains("underline"), "should have underline: {md}");
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["link", "underline"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_underline_strong_link_preserved() {
        // Issue #491: [underline, strong, link] reordered to [strong, underline, link]
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"bold underlined link","marks":[
            {"type":"underline"},
            {"type":"strong"},
            {"type":"link","attrs":{"href":"https://example.com/page"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["underline", "strong", "link"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_strong_underline_link_preserved() {
        // Issue #491: verify [strong, underline, link] is preserved
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"bold underlined link","marks":[
            {"type":"strong"},
            {"type":"underline"},
            {"type":"link","attrs":{"href":"https://example.com/page"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["strong", "underline", "link"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_underline_em_link_preserved() {
        // Issue #491: verify [underline, em, link] is preserved
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"italic underlined link","marks":[
            {"type":"underline"},
            {"type":"em"},
            {"type":"link","attrs":{"href":"https://example.com/page"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["underline", "em", "link"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_underline_strike_link_preserved() {
        // Issue #491: verify [underline, strike, link] is preserved
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"struck underlined link","marks":[
            {"type":"underline"},
            {"type":"strike"},
            {"type":"link","attrs":{"href":"https://example.com/page"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["underline", "strike", "link"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn mark_ordering_underline_strong_em_link_preserved() {
        // Issue #491: verify four-mark combo [underline, strong, em, link] is preserved
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"all the marks","marks":[
            {"type":"underline"},
            {"type":"strong"},
            {"type":"em"},
            {"type":"link","attrs":{"href":"https://example.com/page"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["underline", "strong", "em", "link"],
            "mark order should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn em_strong_round_trip() {
        // Issue #401: em mark dropped when combined with strong
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"bold and italic","marks":[{"type":"strong"},{"type":"em"}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "***bold and italic***");
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.text.as_deref(), Some("bold and italic"));
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["strong", "em"],
            "both strong and em marks should be preserved, got: {mark_types:?}"
        );
    }

    #[test]
    fn em_strong_round_trip_em_first() {
        // Issue #549: [em, strong] mark order must be preserved on round-trip.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"italic and bold","marks":[{"type":"em"},{"type":"strong"}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.text.as_deref(), Some("italic and bold"));
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types,
            vec!["em", "strong"],
            "mark order [em, strong] should be preserved, got: {mark_types:?}"
        );
    }

    /// Round-trips an inline text node with the given marks through ADF → JFM → ADF
    /// and asserts the resulting mark types match `expected`.
    fn assert_mark_order_round_trip(marks: Vec<AdfMark>, expected: &[&str]) {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "text", marks,
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .expect("round-tripped node should have marks")
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types, expected,
            "marks should round-trip in order via {md:?}"
        );
    }

    #[test]
    fn round_trip_em_strong_mark_order() {
        // Issue #549: em + strong in either order must round-trip.
        assert_mark_order_round_trip(vec![AdfMark::em(), AdfMark::strong()], &["em", "strong"]);
        assert_mark_order_round_trip(vec![AdfMark::strong(), AdfMark::em()], &["strong", "em"]);
    }

    #[test]
    fn round_trip_strong_underline_mark_order() {
        // Issue #549: strong + underline in either order must round-trip.
        assert_mark_order_round_trip(
            vec![AdfMark::strong(), AdfMark::underline()],
            &["strong", "underline"],
        );
        assert_mark_order_round_trip(
            vec![AdfMark::underline(), AdfMark::strong()],
            &["underline", "strong"],
        );
    }

    #[test]
    fn round_trip_em_underline_mark_order() {
        assert_mark_order_round_trip(
            vec![AdfMark::em(), AdfMark::underline()],
            &["em", "underline"],
        );
        assert_mark_order_round_trip(
            vec![AdfMark::underline(), AdfMark::em()],
            &["underline", "em"],
        );
    }

    #[test]
    fn round_trip_strike_strong_em_permutations() {
        // Each permutation of {strike, strong, em} must round-trip the mark order
        // exactly, because the Atlassian ADF spec does not define a canonical mark
        // ordering and we preserve whatever ordering Jira delivered.
        assert_mark_order_round_trip(
            vec![AdfMark::strike(), AdfMark::strong(), AdfMark::em()],
            &["strike", "strong", "em"],
        );
        assert_mark_order_round_trip(
            vec![AdfMark::strike(), AdfMark::em(), AdfMark::strong()],
            &["strike", "em", "strong"],
        );
        assert_mark_order_round_trip(
            vec![AdfMark::strong(), AdfMark::strike(), AdfMark::em()],
            &["strong", "strike", "em"],
        );
        assert_mark_order_round_trip(
            vec![AdfMark::strong(), AdfMark::em(), AdfMark::strike()],
            &["strong", "em", "strike"],
        );
        assert_mark_order_round_trip(
            vec![AdfMark::em(), AdfMark::strike(), AdfMark::strong()],
            &["em", "strike", "strong"],
        );
        assert_mark_order_round_trip(
            vec![AdfMark::em(), AdfMark::strong(), AdfMark::strike()],
            &["em", "strong", "strike"],
        );
    }

    #[test]
    fn round_trip_underline_nested_with_strong_em() {
        // Underline may sit outside, between, or inside strong/em — each position
        // must round-trip.
        assert_mark_order_round_trip(
            vec![AdfMark::underline(), AdfMark::strong(), AdfMark::em()],
            &["underline", "strong", "em"],
        );
        assert_mark_order_round_trip(
            vec![AdfMark::strong(), AdfMark::underline(), AdfMark::em()],
            &["strong", "underline", "em"],
        );
        assert_mark_order_round_trip(
            vec![AdfMark::strong(), AdfMark::em(), AdfMark::underline()],
            &["strong", "em", "underline"],
        );
    }

    #[test]
    fn round_trip_span_attr_order_preserved() {
        // Issue #549: the `:span` directive always parses color/bg/subsup
        // attrs in a fixed order, so non-canonical orderings must be emitted
        // as nested :span wrappers rather than a single merged wrapper.
        assert_mark_order_round_trip(
            vec![
                AdfMark::background_color("#ffff00"),
                AdfMark::text_color("#ff0000"),
            ],
            &["backgroundColor", "textColor"],
        );
        assert_mark_order_round_trip(
            vec![AdfMark::subsup("sub"), AdfMark::text_color("#ff0000")],
            &["subsup", "textColor"],
        );
        assert_mark_order_round_trip(
            vec![
                AdfMark::text_color("#ff0000"),
                AdfMark::background_color("#ffff00"),
            ],
            &["textColor", "backgroundColor"],
        );
    }

    #[test]
    fn round_trip_annotation_before_underline() {
        // Issue #549: the bracketed-span parser reads `underline` before any
        // annotation-ids, so `[annotation, underline]` must be emitted as
        // nested wrappers rather than one merged `[text]{underline annotation-id=X}`.
        assert_mark_order_round_trip(
            vec![
                AdfMark::annotation("ann-1", "inlineComment"),
                AdfMark::underline(),
            ],
            &["annotation", "underline"],
        );
        assert_mark_order_round_trip(
            vec![
                AdfMark::annotation("ann-1", "inlineComment"),
                AdfMark::underline(),
                AdfMark::annotation("ann-2", "inlineComment"),
            ],
            &["annotation", "underline", "annotation"],
        );
    }

    #[test]
    fn round_trip_em_content_with_underscores() {
        // When em renders as `_..._` (to disambiguate from strong), any literal
        // underscores in the text must be escaped so they don't close the
        // emphasis span early.  Text like "foo_bar_baz" with [em, strong] must
        // survive round-trip with the underscores intact.
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "foo _bar_ baz",
                vec![AdfMark::em(), AdfMark::strong()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.text.as_deref(), Some("foo _bar_ baz"));
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(mark_types, vec!["em", "strong"]);
    }

    #[test]
    fn round_trip_link_nested_with_formatting_marks() {
        // Link may sit at any position in the marks array relative to em,
        // strong, strike, and underline — each position must round-trip.
        assert_mark_order_round_trip(
            vec![
                AdfMark::link("https://example.com"),
                AdfMark::strong(),
                AdfMark::em(),
            ],
            &["link", "strong", "em"],
        );
        assert_mark_order_round_trip(
            vec![
                AdfMark::em(),
                AdfMark::strong(),
                AdfMark::link("https://example.com"),
            ],
            &["em", "strong", "link"],
        );
        assert_mark_order_round_trip(
            vec![
                AdfMark::underline(),
                AdfMark::link("https://example.com"),
                AdfMark::strong(),
            ],
            &["underline", "link", "strong"],
        );
    }

    /// Builds an `AdfMark` with the given type and no attrs, bypassing the
    /// usual constructors so we can exercise the defensive branches in the
    /// render helpers (the constructors always populate `attrs`).
    fn bare_mark(mark_type: &str) -> AdfMark {
        AdfMark {
            mark_type: mark_type.to_string(),
            attrs: None,
        }
    }

    #[test]
    fn collect_span_attr_handles_missing_attrs() {
        // `textColor`/`backgroundColor`/`subsup` marks without the expected
        // `color`/`type` attr must not emit a fragment (the `if let` falls
        // through without pushing).  This exercises the inner-None branches
        // that the typed-constructor tests otherwise skip.
        let mut attrs = Vec::new();
        collect_span_attr(&bare_mark("textColor"), &mut attrs);
        collect_span_attr(&bare_mark("backgroundColor"), &mut attrs);
        collect_span_attr(&bare_mark("subsup"), &mut attrs);
        collect_span_attr(&bare_mark("link"), &mut attrs);
        assert!(attrs.is_empty(), "got: {attrs:?}");
    }

    #[test]
    fn collect_bracketed_attr_handles_missing_attrs() {
        // An annotation mark with no attrs map at all must silently produce
        // no fragments — this covers the outer `if let Some(ref a)` None arm.
        let mut attrs = Vec::new();
        collect_bracketed_attr(&bare_mark("annotation"), &mut attrs);
        collect_bracketed_attr(&bare_mark("strong"), &mut attrs);
        assert!(attrs.is_empty(), "got: {attrs:?}");
    }

    #[test]
    fn collect_bracketed_attr_handles_annotation_without_id() {
        // An annotation mark with attrs present but missing `id` and
        // `annotationType` keys still emits nothing — exercises the inner
        // None branches of each `if let` in the annotation arm.
        let mark = AdfMark {
            mark_type: "annotation".to_string(),
            attrs: Some(serde_json::json!({})),
        };
        let mut attrs = Vec::new();
        collect_bracketed_attr(&mark, &mut attrs);
        assert!(attrs.is_empty(), "got: {attrs:?}");
    }

    #[test]
    fn span_attr_order_rejects_unknown_types() {
        // `span_attr_order` must classify unknown mark types as the sentinel
        // value, and `span_run_is_canonical` must reject a run that contains
        // any such unknown type.
        assert_eq!(span_attr_order("textColor"), 0);
        assert_eq!(span_attr_order("backgroundColor"), 1);
        assert_eq!(span_attr_order("subsup"), 2);
        assert_eq!(span_attr_order("strong"), u8::MAX);
        assert!(!span_run_is_canonical(&[bare_mark("strong")]));
    }

    #[test]
    fn bracketed_run_rejects_unknown_types() {
        // `bracketed_run_is_canonical` only accepts `underline` and
        // `annotation`; any other mark type in the run short-circuits to
        // `false` so the caller emits nested wrappers.
        assert!(bracketed_run_is_canonical(&[
            AdfMark::underline(),
            AdfMark::annotation("x", "inlineComment")
        ]));
        assert!(!bracketed_run_is_canonical(&[
            AdfMark::annotation("x", "inlineComment"),
            AdfMark::underline()
        ]));
        assert!(!bracketed_run_is_canonical(&[bare_mark("strong")]));
    }

    #[test]
    fn render_marked_text_ignores_unknown_mark_types() {
        // Unknown mark types fall through `render_marked_text`'s `_ =>`
        // arm and are dropped; the rendered JFM must still produce the
        // underlying text (and round-trip back to an unmarked text node).
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "hello",
                vec![bare_mark("futureMark"), AdfMark::strong()],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert_eq!(md.trim(), "**hello**");
        let rt = markdown_to_adf(&md).unwrap();
        let node = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.text.as_deref(), Some("hello"));
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(mark_types, vec!["strong"]);
    }

    #[test]
    fn triple_asterisk_parse_to_adf() {
        // Issue #401: ***text*** should parse as text with strong+em marks
        let md = "***bold and italic***\n";
        let doc = markdown_to_adf(md).unwrap();
        let node = &doc.content[0].content.as_ref().unwrap()[0];
        assert_eq!(node.text.as_deref(), Some("bold and italic"));
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert!(
            mark_types.contains(&"strong") && mark_types.contains(&"em"),
            "***text*** should produce both strong and em marks, got: {mark_types:?}"
        );
    }

    #[test]
    fn triple_asterisk_with_surrounding_text() {
        // Issue #401: surrounding text should not be affected
        let md = "before ***bold italic*** after\n";
        let doc = markdown_to_adf(md).unwrap();
        let nodes = doc.content[0].content.as_ref().unwrap();
        // Should have: "before " (plain), "bold italic" (strong+em), " after" (plain)
        assert!(
            nodes.len() >= 3,
            "expected at least 3 nodes, got {}",
            nodes.len()
        );
        assert_eq!(nodes[0].text.as_deref(), Some("before "));
        assert_eq!(nodes[1].text.as_deref(), Some("bold italic"));
        let mark_types: Vec<&str> = nodes[1]
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert!(
            mark_types.contains(&"strong") && mark_types.contains(&"em"),
            "middle node should have strong+em, got: {mark_types:?}"
        );
        assert_eq!(nodes[2].text.as_deref(), Some(" after"));
    }

    #[test]
    fn annotation_mark_round_trip() {
        // Issue #364: annotation marks were silently dropped
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"highlighted text","marks":[
            {"type":"annotation","attrs":{"id":"abc123","annotationType":"inlineComment"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("annotation-id="),
            "JFM should contain annotation-id, got: {md}"
        );

        let round_tripped = markdown_to_adf(&md).unwrap();
        let text_node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        assert_eq!(text_node.text.as_deref(), Some("highlighted text"));
        let marks = text_node.marks.as_ref().expect("should have marks");
        let ann = marks
            .iter()
            .find(|m| m.mark_type == "annotation")
            .expect("should have annotation mark");
        let attrs = ann.attrs.as_ref().unwrap();
        assert_eq!(attrs["id"], "abc123");
        assert_eq!(attrs["annotationType"], "inlineComment");
    }

    #[test]
    fn annotation_mark_with_bold() {
        // Annotation + bold should both survive round-trip
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "bold comment",
                vec![
                    AdfMark::strong(),
                    AdfMark::annotation("def456", "inlineComment"),
                ],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let text_node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let marks = text_node.marks.as_ref().expect("should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "strong"),
            "should have strong mark"
        );
        assert!(
            marks.iter().any(|m| m.mark_type == "annotation"),
            "should have annotation mark"
        );
    }

    #[test]
    fn annotation_and_link_marks_both_preserved() {
        // Issue #390: text with both annotation and link marks loses link on round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"HANGUL-8","marks":[
            {"type":"annotation","attrs":{"annotationType":"inlineComment","id":"5ca7425e-34cd-48d3-b4eb-9873ac8b20e0"}},
            {"type":"link","attrs":{"href":"https://acme.atlassian.net/browse/HANG-8"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // Should contain both annotation attrs and link syntax
        assert!(
            md.contains("annotation-id="),
            "JFM should contain annotation-id, got: {md}"
        );
        assert!(
            md.contains("](https://"),
            "JFM should contain link href, got: {md}"
        );
        let round_tripped = markdown_to_adf(&md).unwrap();
        let text_node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let marks = text_node.marks.as_ref().expect("should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "annotation"),
            "should have annotation mark, got: {:?}",
            marks.iter().map(|m| &m.mark_type).collect::<Vec<_>>()
        );
        assert!(
            marks.iter().any(|m| m.mark_type == "link"),
            "should have link mark, got: {:?}",
            marks.iter().map(|m| &m.mark_type).collect::<Vec<_>>()
        );
    }

    #[test]
    fn annotation_and_code_marks_both_preserved() {
        // Issue #508: annotation mark dropped when combined with code mark
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"some text with "},
          {"type":"text","text":"annotated code","marks":[
            {"type":"annotation","attrs":{"annotationType":"inlineComment","id":"aabbccdd-1234-5678-abcd-000000000001"}},
            {"type":"code"}
          ]},
          {"type":"text","text":" remaining text"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("annotation-id="),
            "JFM should contain annotation-id, got: {md}"
        );
        assert!(
            md.contains('`'),
            "JFM should contain backticks for code, got: {md}"
        );

        let round_tripped = markdown_to_adf(&md).unwrap();
        let nodes = round_tripped.content[0].content.as_ref().unwrap();
        // Find the text node with "annotated code"
        let code_node = nodes
            .iter()
            .find(|n| n.text.as_deref() == Some("annotated code"))
            .expect("should have 'annotated code' text node");
        let marks = code_node.marks.as_ref().expect("should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "annotation"),
            "should have annotation mark, got: {:?}",
            marks.iter().map(|m| &m.mark_type).collect::<Vec<_>>()
        );
        assert!(
            marks.iter().any(|m| m.mark_type == "code"),
            "should have code mark, got: {:?}",
            marks.iter().map(|m| &m.mark_type).collect::<Vec<_>>()
        );
        let ann = marks.iter().find(|m| m.mark_type == "annotation").unwrap();
        let attrs = ann.attrs.as_ref().unwrap();
        assert_eq!(attrs["id"], "aabbccdd-1234-5678-abcd-000000000001");
        assert_eq!(attrs["annotationType"], "inlineComment");
    }

    #[test]
    fn annotation_and_code_and_link_marks_all_preserved() {
        // annotation + code + link should all survive round-trip
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "linked code",
                vec![
                    AdfMark::annotation("ann-001", "inlineComment"),
                    AdfMark::code(),
                    AdfMark::link("https://example.com"),
                ],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("annotation-id="),
            "JFM should contain annotation-id, got: {md}"
        );
        assert!(md.contains('`'), "JFM should contain backticks, got: {md}");
        assert!(
            md.contains("](https://example.com)"),
            "JFM should contain link, got: {md}"
        );

        let round_tripped = markdown_to_adf(&md).unwrap();
        let text_node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let marks = text_node.marks.as_ref().expect("should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "annotation"),
            "should have annotation mark, got: {:?}",
            marks.iter().map(|m| &m.mark_type).collect::<Vec<_>>()
        );
        assert!(
            marks.iter().any(|m| m.mark_type == "code"),
            "should have code mark, got: {:?}",
            marks.iter().map(|m| &m.mark_type).collect::<Vec<_>>()
        );
        assert!(
            marks.iter().any(|m| m.mark_type == "link"),
            "should have link mark, got: {:?}",
            marks.iter().map(|m| &m.mark_type).collect::<Vec<_>>()
        );
    }

    #[test]
    fn multiple_annotations_and_code_mark_preserved() {
        // Multiple annotation marks on a code node should all survive
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "doubly annotated",
                vec![
                    AdfMark::annotation("ann-aaa", "inlineComment"),
                    AdfMark::annotation("ann-bbb", "inlineComment"),
                    AdfMark::code(),
                ],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("ann-aaa"),
            "JFM should contain first annotation id, got: {md}"
        );
        assert!(
            md.contains("ann-bbb"),
            "JFM should contain second annotation id, got: {md}"
        );

        let round_tripped = markdown_to_adf(&md).unwrap();
        let text_node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let marks = text_node.marks.as_ref().expect("should have marks");
        let ann_marks: Vec<_> = marks
            .iter()
            .filter(|m| m.mark_type == "annotation")
            .collect();
        assert_eq!(
            ann_marks.len(),
            2,
            "should have 2 annotation marks, got: {}",
            ann_marks.len()
        );
        assert!(
            marks.iter().any(|m| m.mark_type == "code"),
            "should have code mark"
        );
    }

    #[test]
    fn underline_and_link_marks_both_preserved() {
        // Underline + link should also coexist
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "click here",
                vec![AdfMark::underline(), AdfMark::link("https://example.com")],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("underline"), "should have underline attr: {md}");
        assert!(
            md.contains("](https://example.com)"),
            "should have link: {md}"
        );
        let round_tripped = markdown_to_adf(&md).unwrap();
        let text_node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let marks = text_node.marks.as_ref().expect("should have marks");
        assert!(marks.iter().any(|m| m.mark_type == "underline"));
        assert!(marks.iter().any(|m| m.mark_type == "link"));
    }

    #[test]
    fn annotation_link_and_bold_all_preserved() {
        // All three marks should coexist
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"important","marks":[
            {"type":"annotation","attrs":{"annotationType":"inlineComment","id":"abc"}},
            {"type":"link","attrs":{"href":"https://example.com"}},
            {"type":"strong"}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let text_node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let marks = text_node.marks.as_ref().expect("should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "annotation"),
            "should have annotation"
        );
        assert!(
            marks.iter().any(|m| m.mark_type == "link"),
            "should have link"
        );
        assert!(
            marks.iter().any(|m| m.mark_type == "strong"),
            "should have strong"
        );
    }

    #[test]
    fn multiple_annotation_marks_round_trip() {
        // Issue #439: multiple annotation marks on same text node — all but last dropped
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"some annotated text","marks":[
            {"type":"annotation","attrs":{"id":"aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee","annotationType":"inlineComment"}},
            {"type":"annotation","attrs":{"id":"ffffffff-1111-2222-3333-444444444444","annotationType":"inlineComment"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"),
            "JFM should contain first annotation id, got: {md}"
        );
        assert!(
            md.contains("ffffffff-1111-2222-3333-444444444444"),
            "JFM should contain second annotation id, got: {md}"
        );

        let round_tripped = markdown_to_adf(&md).unwrap();
        let text_node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        assert_eq!(text_node.text.as_deref(), Some("some annotated text"));
        let marks = text_node.marks.as_ref().expect("should have marks");
        let annotations: Vec<_> = marks
            .iter()
            .filter(|m| m.mark_type == "annotation")
            .collect();
        assert_eq!(
            annotations.len(),
            2,
            "should have 2 annotation marks, got: {annotations:?}"
        );
        let ids: Vec<_> = annotations
            .iter()
            .map(|a| a.attrs.as_ref().unwrap()["id"].as_str().unwrap())
            .collect();
        assert!(ids.contains(&"aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"));
        assert!(ids.contains(&"ffffffff-1111-2222-3333-444444444444"));
    }

    #[test]
    fn three_annotation_marks_round_trip() {
        // Verify three overlapping annotations all survive
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "triple annotated",
                vec![
                    AdfMark::annotation("id-1", "inlineComment"),
                    AdfMark::annotation("id-2", "inlineComment"),
                    AdfMark::annotation("id-3", "inlineComment"),
                ],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let text_node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let marks = text_node.marks.as_ref().expect("should have marks");
        let annotations: Vec<_> = marks
            .iter()
            .filter(|m| m.mark_type == "annotation")
            .collect();
        assert_eq!(
            annotations.len(),
            3,
            "should have 3 annotation marks, got: {annotations:?}"
        );
    }

    #[test]
    fn multiple_annotations_with_bold_round_trip() {
        // Multiple annotations + bold should all survive
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "bold double annotated",
                vec![
                    AdfMark::strong(),
                    AdfMark::annotation("ann-a", "inlineComment"),
                    AdfMark::annotation("ann-b", "inlineComment"),
                ],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let text_node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let marks = text_node.marks.as_ref().expect("should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "strong"),
            "should have strong mark"
        );
        let annotations: Vec<_> = marks
            .iter()
            .filter(|m| m.mark_type == "annotation")
            .collect();
        assert_eq!(
            annotations.len(),
            2,
            "should have 2 annotation marks, got: {annotations:?}"
        );
    }

    #[test]
    fn multiple_annotations_with_link_round_trip() {
        // Multiple annotations + link should all survive
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"linked text","marks":[
            {"type":"annotation","attrs":{"id":"ann-x","annotationType":"inlineComment"}},
            {"type":"annotation","attrs":{"id":"ann-y","annotationType":"inlineComment"}},
            {"type":"link","attrs":{"href":"https://example.com"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let text_node = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let marks = text_node.marks.as_ref().expect("should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "link"),
            "should have link mark"
        );
        let annotations: Vec<_> = marks
            .iter()
            .filter(|m| m.mark_type == "annotation")
            .collect();
        assert_eq!(
            annotations.len(),
            2,
            "should have 2 annotation marks, got: {annotations:?}"
        );
    }

    // ── Issue #471: annotation marks on non-text inline nodes ─────────

    #[test]
    fn annotation_on_emoji_round_trip() {
        // Issue #471: annotation mark on emoji node should survive round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"emoji","attrs":{"id":"1f4dd","shortName":":memo:","text":"📝"},"marks":[
            {"type":"annotation","attrs":{"id":"ccddee11-2233-4455-aabb-ccddee112233","annotationType":"inlineComment"}}
          ]},
          {"type":"text","text":" annotated text","marks":[
            {"type":"annotation","attrs":{"id":"ccddee11-2233-4455-aabb-ccddee112233","annotationType":"inlineComment"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("annotation-id="),
            "JFM should contain annotation-id for emoji, got: {md}"
        );

        let round_tripped = markdown_to_adf(&md).unwrap();
        let nodes = round_tripped.content[0].content.as_ref().unwrap();

        // Emoji node should retain annotation mark
        let emoji_node = nodes.iter().find(|n| n.node_type == "emoji").unwrap();
        let emoji_marks = emoji_node.marks.as_ref().expect("emoji should have marks");
        assert!(
            emoji_marks.iter().any(|m| m.mark_type == "annotation"),
            "emoji should have annotation mark, got: {emoji_marks:?}"
        );
        let ann = emoji_marks
            .iter()
            .find(|m| m.mark_type == "annotation")
            .unwrap();
        assert_eq!(
            ann.attrs.as_ref().unwrap()["id"],
            "ccddee11-2233-4455-aabb-ccddee112233"
        );

        // Text node should also retain annotation mark
        let text_node = nodes.iter().find(|n| n.node_type == "text").unwrap();
        let text_marks = text_node.marks.as_ref().expect("text should have marks");
        assert!(
            text_marks.iter().any(|m| m.mark_type == "annotation"),
            "text should have annotation mark"
        );
    }

    #[test]
    fn annotation_on_status_round_trip() {
        let mut status = AdfNode::status("In Progress", "blue");
        status.marks = Some(vec![AdfMark::annotation("ann-status-1", "inlineComment")]);

        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![status])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("annotation-id="),
            "JFM should contain annotation-id for status, got: {md}"
        );

        let round_tripped = markdown_to_adf(&md).unwrap();
        let nodes = round_tripped.content[0].content.as_ref().unwrap();
        let status_node = nodes.iter().find(|n| n.node_type == "status").unwrap();
        let marks = status_node
            .marks
            .as_ref()
            .expect("status should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "annotation"),
            "status should have annotation mark, got: {marks:?}"
        );
    }

    #[test]
    fn annotation_on_date_round_trip() {
        let mut date = AdfNode::date("1704067200000");
        date.marks = Some(vec![AdfMark::annotation("ann-date-1", "inlineComment")]);

        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![date])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("annotation-id="),
            "JFM should contain annotation-id for date, got: {md}"
        );

        let round_tripped = markdown_to_adf(&md).unwrap();
        let nodes = round_tripped.content[0].content.as_ref().unwrap();
        let date_node = nodes.iter().find(|n| n.node_type == "date").unwrap();
        let marks = date_node.marks.as_ref().expect("date should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "annotation"),
            "date should have annotation mark, got: {marks:?}"
        );
    }

    #[test]
    fn annotation_on_mention_round_trip() {
        let mut mention = AdfNode::mention("user-123", "@Alice");
        mention.marks = Some(vec![AdfMark::annotation("ann-mention-1", "inlineComment")]);

        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![mention])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("annotation-id="),
            "JFM should contain annotation-id for mention, got: {md}"
        );

        let round_tripped = markdown_to_adf(&md).unwrap();
        let nodes = round_tripped.content[0].content.as_ref().unwrap();
        let mention_node = nodes.iter().find(|n| n.node_type == "mention").unwrap();
        let marks = mention_node
            .marks
            .as_ref()
            .expect("mention should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "annotation"),
            "mention should have annotation mark, got: {marks:?}"
        );
    }

    #[test]
    fn annotation_on_inline_card_round_trip() {
        let mut card = AdfNode::inline_card("https://example.com");
        card.marks = Some(vec![AdfMark::annotation("ann-card-1", "inlineComment")]);

        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![card])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("annotation-id="),
            "JFM should contain annotation-id for inlineCard, got: {md}"
        );

        let round_tripped = markdown_to_adf(&md).unwrap();
        let nodes = round_tripped.content[0].content.as_ref().unwrap();
        let card_node = nodes.iter().find(|n| n.node_type == "inlineCard").unwrap();
        let marks = card_node
            .marks
            .as_ref()
            .expect("inlineCard should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "annotation"),
            "inlineCard should have annotation mark, got: {marks:?}"
        );
    }

    #[test]
    fn annotation_on_placeholder_round_trip() {
        let mut placeholder = AdfNode::placeholder("Enter text here");
        placeholder.marks = Some(vec![AdfMark::annotation("ann-ph-1", "inlineComment")]);

        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![placeholder])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("annotation-id="),
            "JFM should contain annotation-id for placeholder, got: {md}"
        );

        let round_tripped = markdown_to_adf(&md).unwrap();
        let nodes = round_tripped.content[0].content.as_ref().unwrap();
        let ph_node = nodes.iter().find(|n| n.node_type == "placeholder").unwrap();
        let marks = ph_node
            .marks
            .as_ref()
            .expect("placeholder should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "annotation"),
            "placeholder should have annotation mark, got: {marks:?}"
        );
    }

    #[test]
    fn multiple_annotations_on_emoji_round_trip() {
        // Multiple annotation marks on a single emoji node
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"emoji","attrs":{"shortName":":fire:","text":"🔥"},"marks":[
            {"type":"annotation","attrs":{"id":"ann-1","annotationType":"inlineComment"}},
            {"type":"annotation","attrs":{"id":"ann-2","annotationType":"inlineComment"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();

        let round_tripped = markdown_to_adf(&md).unwrap();
        let nodes = round_tripped.content[0].content.as_ref().unwrap();
        let emoji_node = nodes.iter().find(|n| n.node_type == "emoji").unwrap();
        let marks = emoji_node.marks.as_ref().expect("emoji should have marks");
        let annotations: Vec<_> = marks
            .iter()
            .filter(|m| m.mark_type == "annotation")
            .collect();
        assert_eq!(
            annotations.len(),
            2,
            "emoji should have 2 annotation marks, got: {annotations:?}"
        );
    }

    #[test]
    fn emoji_without_annotation_unchanged() {
        // Ensure emoji nodes without annotation marks are not affected
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::emoji(":fire:")])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        // Should NOT have bracketed span wrapping
        assert!(
            !md.contains('['),
            "emoji without annotation should not be wrapped in brackets, got: {md}"
        );
        assert!(md.contains(":fire:"));
    }

    // ── Inline directive tests (Tier 4) ───────────────────────────────

    #[test]
    fn status_directive() {
        let doc = markdown_to_adf("The ticket is :status[In Progress]{color=blue}.").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content[1].node_type, "status");
        assert_eq!(content[1].attrs.as_ref().unwrap()["text"], "In Progress");
        assert_eq!(content[1].attrs.as_ref().unwrap()["color"], "blue");
    }

    #[test]
    fn adf_status_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::status("Done", "green")])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":status[Done]{color=green}"));
    }

    #[test]
    fn round_trip_status() {
        let md = "The ticket is :status[In Progress]{color=blue}.\n";
        let doc = markdown_to_adf(md).unwrap();
        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains(":status[In Progress]{color=blue}"));
    }

    #[test]
    fn status_with_style_and_localid_roundtrips() {
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![{
                let mut node = AdfNode::status("open", "green");
                node.attrs.as_mut().unwrap()["style"] =
                    serde_json::Value::String("bold".to_string());
                node.attrs.as_mut().unwrap()["localId"] =
                    serde_json::Value::String("d2205ca5-84b9-4950-a730-bfe550fc146b".to_string());
                node
            }])],
        };

        let md = adf_to_markdown(&adf).unwrap();
        assert!(
            md.contains("style=bold"),
            "Markdown should contain style attr: {md}"
        );
        assert!(
            md.contains("localId=d2205ca5"),
            "Markdown should contain localId attr: {md}"
        );

        let rt = markdown_to_adf(&md).unwrap();
        let status = &rt.content[0].content.as_ref().unwrap()[0];
        let attrs = status.attrs.as_ref().unwrap();
        assert_eq!(attrs["text"], "open");
        assert_eq!(attrs["color"], "green");
        assert_eq!(attrs["style"], "bold");
        assert_eq!(
            attrs["localId"], "d2205ca5-84b9-4950-a730-bfe550fc146b",
            "localId should be preserved, got: {}",
            attrs["localId"]
        );
    }

    #[test]
    fn status_without_style_still_works() {
        let md = ":status[Done]{color=green}\n";
        let doc = markdown_to_adf(md).unwrap();
        let status = &doc.content[0].content.as_ref().unwrap()[0];
        let attrs = status.attrs.as_ref().unwrap();
        assert_eq!(attrs["text"], "Done");
        assert_eq!(attrs["color"], "green");
        // No style attr — should not be present
        assert!(
            attrs.get("style").is_none() || attrs["style"].is_null(),
            "style should not be set when not provided"
        );
    }

    #[test]
    fn strip_local_ids_removes_localid_from_status() {
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![{
                let mut node = AdfNode::status("open", "green");
                node.attrs.as_mut().unwrap()["localId"] =
                    serde_json::Value::String("real-uuid-here".to_string());
                node
            }])],
        };
        let opts = RenderOptions {
            strip_local_ids: true,
        };
        let md = adf_to_markdown_with_options(&adf, &opts).unwrap();
        assert!(
            !md.contains("localId"),
            "localId should be stripped, got: {md}"
        );
        assert!(md.contains("color=green"), "color should be preserved");
    }

    #[test]
    fn strip_local_ids_removes_localid_from_table() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"layout":"default","localId":"table-uuid"},"content":[{"type":"tableRow","content":[{"type":"tableCell","content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(
            !md.contains("localId"),
            "localId should be stripped from table, got: {md}"
        );
        assert!(md.contains("layout=default"), "layout should be preserved");
    }

    #[test]
    fn default_options_preserve_localid() {
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![{
                let mut node = AdfNode::status("open", "green");
                node.attrs.as_mut().unwrap()["localId"] =
                    serde_json::Value::String("real-uuid-here".to_string());
                node
            }])],
        };
        let md = adf_to_markdown(&adf).unwrap();
        assert!(
            md.contains("localId=real-uuid-here"),
            "Default should preserve localId, got: {md}"
        );
    }

    #[test]
    fn mention_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"mention","attrs":{"id":"user123","text":"@Alice","localId":"m-001"}}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=m-001"),
            "mention should have localId in md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let mention = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(mention.attrs.as_ref().unwrap()["localId"], "m-001");
    }

    #[test]
    fn date_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"date","attrs":{"timestamp":"1700000000000","localId":"d-001"}}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=d-001"),
            "date should have localId in md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let date = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(date.attrs.as_ref().unwrap()["localId"], "d-001");
    }

    #[test]
    fn emoji_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"emoji","attrs":{"shortName":":smile:","localId":"e-001"}}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=e-001"),
            "emoji should have localId in md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let emoji = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(emoji.attrs.as_ref().unwrap()["localId"], "e-001");
    }

    #[test]
    fn inline_card_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"inlineCard","attrs":{"url":"https://example.com","localId":"c-001"}}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=c-001"),
            "inlineCard should have localId in md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let card = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(card.attrs.as_ref().unwrap()["localId"], "c-001");
    }

    #[test]
    fn strip_local_ids_removes_from_mention() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"mention","attrs":{"id":"user123","text":"@Alice","localId":"m-001"}}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(
            !md.contains("localId"),
            "localId should be stripped from mention: {md}"
        );
        assert!(md.contains("id=user123"), "other attrs should be preserved");
    }

    #[test]
    fn strip_local_ids_removes_from_date() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"date","attrs":{"timestamp":"1700000000000","localId":"d-001"}}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(
            !md.contains("localId"),
            "localId should be stripped from date: {md}"
        );
    }

    #[test]
    fn strip_local_ids_removes_from_block_attrs() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","attrs":{"localId":"p-001"},"content":[{"type":"text","text":"hello"}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(
            !md.contains("localId"),
            "localId should be stripped from block attrs: {md}"
        );
    }

    #[test]
    fn table_cell_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{},"content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{"localId":"tc-001"},"content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=tc-001"),
            "tableCell should have localId in md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let cell = &rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        assert_eq!(
            cell.attrs.as_ref().unwrap()["localId"],
            "tc-001",
            "tableCell localId should round-trip"
        );
    }

    #[test]
    fn table_cell_border_mark_roundtrip() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{},"marks":[{"type":"border","attrs":{"color":"#ff000033","size":2}}],"content":[{"type":"paragraph","content":[{"type":"text","text":"cell with border"}]}]}]}]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("border-color=#ff000033"),
            "tableCell should have border-color in md: {md}"
        );
        assert!(
            md.contains("border-size=2"),
            "tableCell should have border-size in md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let cell = &rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let marks = cell.marks.as_ref().expect("tableCell should have marks");
        assert_eq!(marks.len(), 1);
        assert_eq!(marks[0].mark_type, "border");
        let attrs = marks[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["color"], "#ff000033");
        assert_eq!(attrs["size"], 2);
    }

    #[test]
    fn table_header_border_mark_roundtrip() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableHeader","attrs":{},"marks":[{"type":"border","attrs":{"color":"#0000ff","size":3}}],"content":[{"type":"paragraph","content":[{"type":"text","text":"header"}]}]}]}]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("border-color=#0000ff"), "md: {md}");
        assert!(md.contains("border-size=3"), "md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let cell = &rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        assert_eq!(cell.node_type, "tableHeader");
        let marks = cell.marks.as_ref().expect("tableHeader should have marks");
        assert_eq!(marks[0].mark_type, "border");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["color"], "#0000ff");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["size"], 3);
    }

    #[test]
    fn table_cell_border_mark_with_attrs_roundtrip() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{"background":"#e6fcff","colspan":2},"marks":[{"type":"border","attrs":{"color":"#ff000033","size":1}}],"content":[{"type":"paragraph","content":[{"type":"text","text":"styled"}]}]}]}]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("bg=#e6fcff"), "md: {md}");
        assert!(md.contains("colspan=2"), "md: {md}");
        assert!(md.contains("border-color=#ff000033"), "md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let cell = &rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        assert_eq!(cell.attrs.as_ref().unwrap()["background"], "#e6fcff");
        assert_eq!(cell.attrs.as_ref().unwrap()["colspan"], 2);
        let marks = cell.marks.as_ref().expect("should have marks");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["color"], "#ff000033");
    }

    #[test]
    fn table_cell_no_border_mark_unchanged() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableCell","content":[{"type":"paragraph","content":[{"type":"text","text":"plain"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            !md.contains("border-color"),
            "no border attrs expected: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let cell = &rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        assert!(cell.marks.is_none(), "no marks expected on plain cell");
    }

    #[test]
    fn table_cell_border_size_only_defaults_color() {
        // border-size without border-color should still produce a border mark
        // with the default color
        let md = "::::table\n:::tr\n:::td{border-size=3}\ncell\n:::\n:::\n::::\n";
        let doc = markdown_to_adf(md).unwrap();
        let cell = &doc.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let marks = cell.marks.as_ref().expect("should have border mark");
        assert_eq!(marks[0].mark_type, "border");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["color"], "#000000");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["size"], 3);
    }

    #[test]
    fn table_cell_border_color_only_defaults_size() {
        // border-color without border-size should default size to 1
        let md = "::::table\n:::tr\n:::td{border-color=#ff0000}\ncell\n:::\n:::\n::::\n";
        let doc = markdown_to_adf(md).unwrap();
        let cell = &doc.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let marks = cell.marks.as_ref().expect("should have border mark");
        assert_eq!(marks[0].mark_type, "border");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["color"], "#ff0000");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["size"], 1);
    }

    #[test]
    fn media_file_border_mark_roundtrip() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"mediaSingle","attrs":{"layout":"center","width":400,"widthType":"pixel"},"content":[{"type":"media","attrs":{"id":"aabbccdd-1234-5678-abcd-aabbccdd1234","type":"file","collection":"contentId-123456","width":800,"height":600},"marks":[{"type":"border","attrs":{"color":"#091e4224","size":2}}]}]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("border-color=#091e4224"),
            "media should have border-color in md: {md}"
        );
        assert!(
            md.contains("border-size=2"),
            "media should have border-size in md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let media_single = &rt.content[0];
        let media = &media_single.content.as_ref().unwrap()[0];
        assert_eq!(media.node_type, "media");
        let marks = media.marks.as_ref().expect("media should have marks");
        assert_eq!(marks.len(), 1);
        assert_eq!(marks[0].mark_type, "border");
        let attrs = marks[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["color"], "#091e4224");
        assert_eq!(attrs["size"], 2);
    }

    #[test]
    fn media_external_border_mark_roundtrip() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"mediaSingle","attrs":{"layout":"center"},"content":[{"type":"media","attrs":{"type":"external","url":"https://example.com/img.png"},"marks":[{"type":"border","attrs":{"color":"#ff0000","size":3}}]}]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("border-color=#ff0000"),
            "external media should have border-color in md: {md}"
        );
        assert!(
            md.contains("border-size=3"),
            "external media should have border-size in md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let media = &rt.content[0].content.as_ref().unwrap()[0];
        let marks = media.marks.as_ref().expect("media should have marks");
        assert_eq!(marks[0].mark_type, "border");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["color"], "#ff0000");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["size"], 3);
    }

    #[test]
    fn media_file_no_border_mark_unchanged() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"mediaSingle","attrs":{"layout":"center"},"content":[{"type":"media","attrs":{"id":"abc-123","type":"file","collection":"col-1","width":100,"height":100}}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            !md.contains("border-color"),
            "no border attrs expected: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let media = &rt.content[0].content.as_ref().unwrap()[0];
        assert!(media.marks.is_none(), "no marks expected on plain media");
    }

    #[test]
    fn media_border_size_only_defaults_color() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"mediaSingle","attrs":{"layout":"center"},"content":[{"type":"media","attrs":{"id":"abc","type":"file","collection":"col"},"marks":[{"type":"border","attrs":{"size":4}}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("border-size=4"), "md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let media = &rt.content[0].content.as_ref().unwrap()[0];
        let marks = media.marks.as_ref().expect("should have border mark");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["color"], "#000000");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["size"], 4);
    }

    #[test]
    fn media_border_color_only_defaults_size() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"mediaSingle","attrs":{"layout":"center"},"content":[{"type":"media","attrs":{"id":"abc","type":"file","collection":"col"},"marks":[{"type":"border","attrs":{"color":"#00ff00"}}]}]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("border-color=#00ff00"), "md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let media = &rt.content[0].content.as_ref().unwrap()[0];
        let marks = media.marks.as_ref().expect("should have border mark");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["color"], "#00ff00");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["size"], 1);
    }

    #[test]
    fn media_border_with_other_attrs_roundtrip() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"mediaSingle","attrs":{"layout":"wide","width":600,"widthType":"pixel"},"content":[{"type":"media","attrs":{"id":"xyz","type":"file","collection":"col","width":1200,"height":800},"marks":[{"type":"border","attrs":{"color":"#091e4224","size":2}}]}]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("layout=wide"), "md: {md}");
        assert!(md.contains("mediaWidth=600"), "md: {md}");
        assert!(md.contains("border-color=#091e4224"), "md: {md}");
        assert!(md.contains("border-size=2"), "md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let ms = &rt.content[0];
        assert_eq!(ms.attrs.as_ref().unwrap()["layout"], "wide");
        let media = &ms.content.as_ref().unwrap()[0];
        let marks = media.marks.as_ref().expect("should have marks");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["color"], "#091e4224");
        assert_eq!(marks[0].attrs.as_ref().unwrap()["size"], 2);
    }

    #[test]
    fn table_row_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{},"content":[{"type":"tableRow","attrs":{"localId":"tr-001"},"content":[{"type":"tableCell","content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=tr-001"),
            "tableRow should have localId in md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let row = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(
            row.attrs.as_ref().unwrap()["localId"],
            "tr-001",
            "tableRow localId should round-trip"
        );
    }

    #[test]
    fn list_item_localid_roundtrip() {
        // listItem localId is emitted as trailing inline attrs and parsed back
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","attrs":{"localId":"li-001"},"content":[{"type":"paragraph","content":[{"type":"text","text":"item"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=li-001"),
            "listItem should have localId in md: {md}"
        );
        // Verify localId is on the listItem, NOT promoted to bulletList
        let rt = markdown_to_adf(&md).unwrap();
        let list = &rt.content[0];
        assert!(
            list.attrs.is_none() || list.attrs.as_ref().unwrap().get("localId").is_none(),
            "bulletList should NOT have localId: {:?}",
            list.attrs
        );
        let item = &list.content.as_ref().unwrap()[0];
        assert_eq!(
            item.attrs.as_ref().unwrap()["localId"],
            "li-001",
            "listItem should have localId=li-001"
        );
    }

    #[test]
    fn list_item_localid_not_promoted_to_parent() {
        // Verify localId stays on listItem and doesn't leak to parent list
        let md = "- item {localId=li-002}\n";
        let doc = markdown_to_adf(md).unwrap();
        let list = &doc.content[0];
        assert!(
            list.attrs.is_none(),
            "bulletList should have no attrs: {:?}",
            list.attrs
        );
        let item = &list.content.as_ref().unwrap()[0];
        assert_eq!(item.attrs.as_ref().unwrap()["localId"], "li-002");
    }

    #[test]
    fn ordered_list_item_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[{"type":"listItem","attrs":{"localId":"oli-001"},"content":[{"type":"paragraph","content":[{"type":"text","text":"first"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("localId=oli-001"), "md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(item.attrs.as_ref().unwrap()["localId"], "oli-001");
    }

    #[test]
    fn task_item_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":"tl-001"},"content":[{"type":"taskItem","attrs":{"localId":"ti-001","state":"TODO"},"content":[{"type":"paragraph","content":[{"type":"text","text":"task"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("localId=ti-001"), "md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(item.attrs.as_ref().unwrap()["localId"], "ti-001");
    }

    /// Issue #447: taskList with empty-string localId and taskItems with
    /// short numeric localIds must survive a full round-trip.
    #[test]
    fn task_list_short_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":""},"content":[{"type":"taskItem","attrs":{"localId":"42","state":"TODO"}},{"type":"taskItem","attrs":{"localId":"99","state":"DONE"},"content":[{"type":"text","text":"done task"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // Both taskItem localIds should appear in the markdown
        assert!(md.contains("localId=42"), "localId=42 missing: {md}");
        assert!(md.contains("localId=99"), "localId=99 missing: {md}");
        // Empty-string localId should NOT appear as {localId=}
        assert!(
            !md.contains("localId=}"),
            "empty localId should not be emitted: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let task_list = &rt.content[0];
        assert_eq!(task_list.node_type, "taskList");
        // No spurious extra nodes from {localId=}
        assert_eq!(rt.content.len(), 1, "should be exactly one top-level node");
        let items = task_list.content.as_ref().unwrap();
        assert_eq!(items.len(), 2);
        // First taskItem: localId=42, state=TODO, no content
        assert_eq!(items[0].attrs.as_ref().unwrap()["localId"], "42");
        assert_eq!(items[0].attrs.as_ref().unwrap()["state"], "TODO");
        assert!(
            items[0].content.is_none(),
            "empty taskItem should have no content: {:?}",
            items[0].content
        );
        // Second taskItem: localId=99, state=DONE, content with text
        assert_eq!(items[1].attrs.as_ref().unwrap()["localId"], "99");
        assert_eq!(items[1].attrs.as_ref().unwrap()["state"], "DONE");
        let content = items[1].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].text.as_deref(), Some("done task"));
    }

    /// Issue #507: numeric localId on taskItem with hardBreak must survive
    /// round-trip — the {localId=…} suffix lands on the continuation line
    /// and must still be extracted by the parser.
    #[test]
    fn task_item_numeric_localid_with_hardbreak_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":""},"content":[{"type":"taskItem","attrs":{"localId":"42","state":"DONE"},"content":[{"type":"paragraph","content":[{"type":"text","text":"Engineering Onboarding Link","marks":[{"type":"link","attrs":{"href":"https://example.com/onboarding"}}]},{"type":"hardBreak"},{"type":"text","text":"(This has links to all the various useful tools!!)"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // localId must appear in the markdown output
        assert!(md.contains("localId=42"), "localId=42 missing: {md}");
        // Round-trip back to ADF
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(rt.content.len(), 1, "exactly one top-level node");
        let task_list = &rt.content[0];
        assert_eq!(task_list.node_type, "taskList");
        let items = task_list.content.as_ref().unwrap();
        assert_eq!(items.len(), 1);
        // localId preserved
        assert_eq!(items[0].attrs.as_ref().unwrap()["localId"], "42");
        assert_eq!(items[0].attrs.as_ref().unwrap()["state"], "DONE");
        // Content structure preserved: paragraph with link + hardBreak + text
        let para = &items[0].content.as_ref().unwrap()[0];
        assert_eq!(para.node_type, "paragraph");
        let inlines = para.content.as_ref().unwrap();
        assert_eq!(inlines[0].node_type, "text");
        assert_eq!(
            inlines[0].text.as_deref(),
            Some("Engineering Onboarding Link")
        );
        assert_eq!(inlines[1].node_type, "hardBreak");
        assert_eq!(inlines[2].node_type, "text");
        assert_eq!(
            inlines[2].text.as_deref(),
            Some("(This has links to all the various useful tools!!)")
        );
        // The {localId=…} must not appear as literal text in the ADF output
        let rt_json = serde_json::to_string(&rt).unwrap();
        assert!(
            !rt_json.contains("{localId="),
            "localId attr syntax should not leak into ADF text: {rt_json}"
        );
    }

    /// Issue #507: multiple taskItems with hardBreaks and numeric localIds.
    #[test]
    fn task_item_multiple_hardbreak_localids_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":""},"content":[{"type":"taskItem","attrs":{"localId":"42","state":"DONE"},"content":[{"type":"paragraph","content":[{"type":"text","text":"first line"},{"type":"hardBreak"},{"type":"text","text":"second line"}]}]},{"type":"taskItem","attrs":{"localId":"67","state":"TODO"},"content":[{"type":"paragraph","content":[{"type":"text","text":"alpha"},{"type":"hardBreak"},{"type":"text","text":"beta"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("localId=42"), "localId=42 missing: {md}");
        assert!(md.contains("localId=67"), "localId=67 missing: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);
        assert_eq!(items[0].attrs.as_ref().unwrap()["localId"], "42");
        assert_eq!(items[1].attrs.as_ref().unwrap()["localId"], "67");
        // Verify hardBreak content structure for both items
        for item in items {
            let para = &item.content.as_ref().unwrap()[0];
            assert_eq!(para.node_type, "paragraph");
            let inlines = para.content.as_ref().unwrap();
            assert_eq!(inlines[1].node_type, "hardBreak");
        }
    }

    /// Issue #521: sibling taskItems with numeric localIds and hardBreak —
    /// unwrapped inline content.  The hardBreak continuation line must be
    /// indented so it stays within the list item, and both localIds must
    /// survive the round-trip.
    #[test]
    fn task_item_sibling_localid_hardbreak_unwrapped_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":""},"content":[{"type":"taskItem","attrs":{"localId":"42","state":"DONE"},"content":[{"type":"text","text":"link text","marks":[{"type":"link","attrs":{"href":"https://example.com/page"}}]},{"type":"hardBreak"},{"type":"text","text":"(parenthetical note after hard break)"}]},{"type":"taskItem","attrs":{"localId":"69","state":"DONE"},"content":[{"type":"text","text":"second task item"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // Continuation line must be indented
        assert!(
            md.contains("  (parenthetical"),
            "continuation line should be 2-space indented: {md}"
        );
        assert!(md.contains("localId=42"), "localId=42 missing: {md}");
        assert!(md.contains("localId=69"), "localId=69 missing: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        // Must remain a single taskList with 2 items
        assert_eq!(
            rt.content.len(),
            1,
            "should be one taskList: {:#?}",
            rt.content
        );
        assert_eq!(rt.content[0].node_type, "taskList");
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2, "should have 2 taskItems");
        assert_eq!(items[0].attrs.as_ref().unwrap()["localId"], "42");
        assert_eq!(items[1].attrs.as_ref().unwrap()["localId"], "69");
        // Verify first item has hardBreak
        let first_content = items[0].content.as_ref().unwrap();
        assert!(
            first_content.iter().any(|n| n.node_type == "hardBreak"),
            "first item should contain hardBreak"
        );
        // Verify second item content
        let second_content = items[1].content.as_ref().unwrap();
        assert_eq!(second_content[0].node_type, "text");
        assert_eq!(
            second_content[0].text.as_deref().unwrap(),
            "second task item"
        );
    }

    /// Issue #521: sibling taskItems with paragraph-wrapped content and
    /// hardBreak — localIds must not be swapped or lost.
    #[test]
    fn task_item_sibling_localid_hardbreak_paragraph_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":""},"content":[{"type":"taskItem","attrs":{"localId":"42","state":"DONE"},"content":[{"type":"paragraph","content":[{"type":"text","text":"link text","marks":[{"type":"link","attrs":{"href":"https://example.com/page"}}]},{"type":"hardBreak"},{"type":"text","text":"(parenthetical note after hard break)"}]}]},{"type":"taskItem","attrs":{"localId":"69","state":"DONE"},"content":[{"type":"paragraph","content":[{"type":"text","text":"second task item"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(
            rt.content.len(),
            1,
            "should be one taskList: {:#?}",
            rt.content
        );
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);
        assert_eq!(items[0].attrs.as_ref().unwrap()["localId"], "42");
        assert_eq!(items[1].attrs.as_ref().unwrap()["localId"], "69");
    }

    /// Issue #521: three sibling taskItems — the middle one has a hardBreak.
    /// Ensures localIds don't leak between adjacent items.
    #[test]
    fn task_item_three_siblings_middle_hardbreak_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":""},"content":[{"type":"taskItem","attrs":{"localId":"10","state":"TODO"},"content":[{"type":"text","text":"first"}]},{"type":"taskItem","attrs":{"localId":"20","state":"DONE"},"content":[{"type":"text","text":"alpha"},{"type":"hardBreak"},{"type":"text","text":"beta"}]},{"type":"taskItem","attrs":{"localId":"30","state":"TODO"},"content":[{"type":"text","text":"third"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(rt.content.len(), 1);
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 3);
        assert_eq!(items[0].attrs.as_ref().unwrap()["localId"], "10");
        assert_eq!(items[1].attrs.as_ref().unwrap()["localId"], "20");
        assert_eq!(items[2].attrs.as_ref().unwrap()["localId"], "30");
        // Middle item should have hardBreak
        let mid_content = items[1].content.as_ref().unwrap();
        assert!(mid_content.iter().any(|n| n.node_type == "hardBreak"));
    }

    /// Issue #447: regression — taskList with empty localId must not inject
    /// a spurious paragraph.
    #[test]
    fn task_list_empty_localid_no_spurious_paragraph() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":""},"content":[{"type":"taskItem","attrs":{"localId":"tsk-1","state":"DONE"},"content":[{"type":"text","text":"completed item"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            !md.contains("{localId=}"),
            "empty localId should not be emitted: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(
            rt.content.len(),
            1,
            "no spurious paragraph: {:#?}",
            rt.content
        );
        assert_eq!(rt.content[0].node_type, "taskList");
    }

    /// Issue #447: taskList localId should be stripped when strip_local_ids is set.
    #[test]
    fn task_list_localid_stripped() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":"tl-001"},"content":[{"type":"taskItem","attrs":{"localId":"ti-001","state":"TODO"},"content":[{"type":"paragraph","content":[{"type":"text","text":"task"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(!md.contains("localId"), "localId should be stripped: {md}");
    }

    /// Issue #447: taskItem with no content still emits localId.
    #[test]
    fn task_item_no_content_emits_localid() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":"00000000-0000-0000-0000-000000000000"},"content":[{"type":"taskItem","attrs":{"localId":"abc","state":"TODO"}}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=abc"),
            "localId should be emitted even without content: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(item.attrs.as_ref().unwrap()["localId"], "abc");
        assert!(item.content.is_none(), "should have no content");
    }

    /// Issue #447: taskList localId roundtrips through block attrs.
    #[test]
    fn task_list_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":"tl-xyz"},"content":[{"type":"taskItem","attrs":{"localId":"ti-001","state":"TODO"},"content":[{"type":"paragraph","content":[{"type":"text","text":"task"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=tl-xyz"),
            "taskList localId missing: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(
            rt.content[0].attrs.as_ref().unwrap()["localId"],
            "tl-xyz",
            "taskList localId should survive round-trip"
        );
    }

    /// Issue #478: taskItem with paragraph wrapper (no localId) preserves wrapper on round-trip.
    #[test]
    fn task_item_paragraph_wrapper_roundtrip_no_localid() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":"tl-001"},"content":[{"type":"taskItem","attrs":{"localId":"ti-001","state":"TODO"},"content":[{"type":"paragraph","content":[{"type":"text","text":"A task with paragraph wrapper"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("paraLocalId=_"),
            "should emit paraLocalId=_ sentinel: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let content = item.content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should have one child: {content:#?}");
        assert_eq!(
            content[0].node_type, "paragraph",
            "child should be a paragraph: {content:#?}"
        );
        let para_content = content[0].content.as_ref().unwrap();
        assert_eq!(
            para_content[0].text.as_deref(),
            Some("A task with paragraph wrapper")
        );
        // Paragraph should have no attrs (localId was absent in the original)
        assert!(
            content[0].attrs.is_none(),
            "paragraph should have no attrs: {:?}",
            content[0].attrs
        );
    }

    /// Issue #478: taskItem with paragraph wrapper AND paraLocalId preserves both.
    #[test]
    fn task_item_paragraph_wrapper_roundtrip_with_localid() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":"tl-001"},"content":[{"type":"taskItem","attrs":{"localId":"ti-001","state":"TODO"},"content":[{"type":"paragraph","attrs":{"localId":"p-001"},"content":[{"type":"text","text":"task with para id"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("paraLocalId=p-001"),
            "should emit paraLocalId=p-001: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let content = item.content.as_ref().unwrap();
        assert_eq!(content[0].node_type, "paragraph");
        assert_eq!(
            content[0].attrs.as_ref().unwrap()["localId"],
            "p-001",
            "paragraph localId should be preserved"
        );
    }

    /// Issue #478: taskItem WITHOUT paragraph wrapper (unwrapped inline) still round-trips correctly.
    #[test]
    fn task_item_unwrapped_inline_no_paragraph_on_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":"tl-001"},"content":[{"type":"taskItem","attrs":{"localId":"ti-001","state":"TODO"},"content":[{"type":"text","text":"unwrapped task"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            !md.contains("paraLocalId"),
            "should NOT emit paraLocalId for unwrapped inline: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let content = item.content.as_ref().unwrap();
        assert_eq!(
            content[0].node_type, "text",
            "should remain unwrapped: {content:#?}"
        );
    }

    /// Issue #478: DONE taskItem with paragraph wrapper round-trips.
    #[test]
    fn task_item_done_paragraph_wrapper_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":"tl-001"},"content":[{"type":"taskItem","attrs":{"localId":"ti-001","state":"DONE"},"content":[{"type":"paragraph","content":[{"type":"text","text":"completed task"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("- [x]"), "should render as done: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(item.attrs.as_ref().unwrap()["state"], "DONE");
        let content = item.content.as_ref().unwrap();
        assert_eq!(content[0].node_type, "paragraph");
    }

    /// Issue #478: mixed taskItems — some with paragraph wrapper, some without.
    #[test]
    fn task_item_mixed_paragraph_and_unwrapped_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":"tl-001"},"content":[{"type":"taskItem","attrs":{"localId":"ti-001","state":"TODO"},"content":[{"type":"paragraph","content":[{"type":"text","text":"wrapped"}]}]},{"type":"taskItem","attrs":{"localId":"ti-002","state":"DONE"},"content":[{"type":"text","text":"unwrapped"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);
        // First item: paragraph wrapper preserved
        let c1 = items[0].content.as_ref().unwrap();
        assert_eq!(
            c1[0].node_type, "paragraph",
            "first item should have paragraph wrapper"
        );
        // Second item: no paragraph wrapper
        let c2 = items[1].content.as_ref().unwrap();
        assert_eq!(
            c2[0].node_type, "text",
            "second item should remain unwrapped"
        );
    }

    /// Issue #478: taskItem with paragraph wrapper containing marks round-trips.
    #[test]
    fn task_item_paragraph_wrapper_with_marks_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":"tl-001"},"content":[{"type":"taskItem","attrs":{"localId":"ti-001","state":"TODO"},"content":[{"type":"paragraph","content":[{"type":"text","text":"bold "},{"type":"text","text":"text","marks":[{"type":"strong"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let content = item.content.as_ref().unwrap();
        assert_eq!(content[0].node_type, "paragraph");
        let para_children = content[0].content.as_ref().unwrap();
        assert!(
            para_children.len() >= 2,
            "paragraph should contain multiple inline nodes"
        );
    }

    /// Issue #478: strip_local_ids suppresses the paraLocalId=_ sentinel too.
    #[test]
    fn task_item_paragraph_wrapper_stripped_with_option() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"taskList","attrs":{"localId":"tl-001"},"content":[{"type":"taskItem","attrs":{"localId":"ti-001","state":"TODO"},"content":[{"type":"paragraph","content":[{"type":"text","text":"task"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(
            !md.contains("paraLocalId"),
            "paraLocalId should be stripped: {md}"
        );
        assert!(
            !md.contains("localId"),
            "all localIds should be stripped: {md}"
        );
    }

    #[test]
    fn trailing_space_preserved_with_hex_localid() {
        // Issue #449: trailing whitespace stripped from text node
        // when listItem has a hex-format localId (no hyphens)
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","attrs":{"localId":"aabb112233cc"},"content":[{"type":"paragraph","content":[{"type":"text","text":"trailing space "}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(
            item.attrs.as_ref().unwrap()["localId"],
            "aabb112233cc",
            "localId should round-trip"
        );
        let para = &item.content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        let last = inlines.last().unwrap();
        assert!(
            last.text.as_deref().unwrap_or("").ends_with(' '),
            "trailing space should be preserved, got nodes: {:?}",
            inlines
                .iter()
                .map(|n| (&n.node_type, &n.text))
                .collect::<Vec<_>>()
        );
    }

    #[test]
    fn extract_trailing_local_id_preserves_trailing_space() {
        // Issue #449: only strip the single separator space before {localId=...}
        let (before, lid, _) = extract_trailing_local_id("trailing space  {localId=aabb112233cc}");
        assert_eq!(before, "trailing space ");
        assert_eq!(lid.as_deref(), Some("aabb112233cc"));
    }

    #[test]
    fn extract_trailing_local_id_no_trailing_space() {
        let (before, lid, _) = extract_trailing_local_id("text {localId=abc123}");
        assert_eq!(before, "text");
        assert_eq!(lid.as_deref(), Some("abc123"));
    }

    #[test]
    fn extract_trailing_local_id_no_attrs() {
        let (before, lid, pid) = extract_trailing_local_id("plain text");
        assert_eq!(before, "plain text");
        assert!(lid.is_none());
        assert!(pid.is_none());
    }

    #[test]
    fn list_item_localid_stripped() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","attrs":{"localId":"li-001"},"content":[{"type":"paragraph","content":[{"type":"text","text":"item"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(!md.contains("localId"), "localId should be stripped: {md}");
    }

    #[test]
    fn paragraph_localid_in_list_item_roundtrip() {
        // Issue #417: paragraph.attrs.localId dropped in listItem context
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","attrs":{"localId":"list-001"},"content":[{"type":"listItem","attrs":{"localId":"item-001"},"content":[{"type":"paragraph","attrs":{"localId":"para-001"},"content":[{"type":"text","text":"item text"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("paraLocalId=para-001"),
            "paragraph localId should be in md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(
            item.attrs.as_ref().unwrap()["localId"],
            "item-001",
            "listItem localId should survive"
        );
        let para = &item.content.as_ref().unwrap()[0];
        assert_eq!(
            para.attrs.as_ref().unwrap()["localId"],
            "para-001",
            "paragraph localId should survive round-trip"
        );
    }

    #[test]
    fn paragraph_localid_in_ordered_list_item_roundtrip() {
        // Issue #417: paragraph localId in ordered list
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[{"type":"listItem","attrs":{"localId":"oli-001"},"content":[{"type":"paragraph","attrs":{"localId":"op-001"},"content":[{"type":"text","text":"first"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("paraLocalId=op-001"), "md: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(item.attrs.as_ref().unwrap()["localId"], "oli-001");
        let para = &item.content.as_ref().unwrap()[0];
        assert_eq!(para.attrs.as_ref().unwrap()["localId"], "op-001");
    }

    #[test]
    fn paragraph_localid_only_in_list_item() {
        // paragraph has localId but listItem does not
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","attrs":{"localId":"para-only"},"content":[{"type":"text","text":"text"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("paraLocalId=para-only"),
            "paragraph localId should be emitted: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let item = &rt.content[0].content.as_ref().unwrap()[0];
        assert!(item.attrs.is_none(), "listItem should have no attrs");
        let para = &item.content.as_ref().unwrap()[0];
        assert_eq!(para.attrs.as_ref().unwrap()["localId"], "para-only");
    }

    #[test]
    fn paragraph_localid_in_table_header_roundtrip() {
        // Issue #417: paragraph.attrs.localId dropped in tableHeader context
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default"},"content":[{"type":"tableRow","content":[{"type":"tableHeader","attrs":{},"content":[{"type":"paragraph","attrs":{"localId":"aaaa-aaaa"},"content":[{"type":"text","text":"hello"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // Should use directive form (not pipe table) to preserve paragraph localId
        assert!(
            md.contains("localId=aaaa-aaaa"),
            "paragraph localId should be in md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let cell = &rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let para = &cell.content.as_ref().unwrap()[0];
        assert_eq!(
            para.attrs.as_ref().unwrap()["localId"],
            "aaaa-aaaa",
            "paragraph localId should survive round-trip in tableHeader"
        );
    }

    #[test]
    fn paragraph_localid_in_table_cell_roundtrip() {
        // Issue #417: paragraph localId in tableCell forces directive table
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default"},"content":[{"type":"tableRow","content":[{"type":"tableHeader","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"header"}]}]}]},{"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[{"type":"paragraph","attrs":{"localId":"cell-para"},"content":[{"type":"text","text":"data"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=cell-para"),
            "paragraph localId should be in md: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        // Data row -> cell -> paragraph
        let cell = &rt.content[0].content.as_ref().unwrap()[1]
            .content
            .as_ref()
            .unwrap()[0];
        let para = &cell.content.as_ref().unwrap()[0];
        assert_eq!(
            para.attrs.as_ref().unwrap()["localId"],
            "cell-para",
            "paragraph localId should survive round-trip in tableCell"
        );
    }

    #[test]
    fn nbsp_paragraph_with_localid_roundtrip() {
        // Issue #417: nbsp paragraph localId emitted as text instead of attrs
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","attrs":{"localId":"nbsp-para"},"content":[{"type":"text","text":"\u00a0"}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("::paragraph["),
            "nbsp should use directive form: {md}"
        );
        assert!(
            md.contains("localId=nbsp-para"),
            "localId should be in directive: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let para = &rt.content[0];
        assert_eq!(
            para.attrs.as_ref().unwrap()["localId"],
            "nbsp-para",
            "localId should survive round-trip"
        );
        let text = para.content.as_ref().unwrap()[0].text.as_ref().unwrap();
        assert_eq!(text, "\u{00a0}", "nbsp should survive");
    }

    #[test]
    fn empty_paragraph_with_localid_roundtrip() {
        // Empty paragraph directive with localId
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","attrs":{"localId":"empty-para"}}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("::paragraph{localId=empty-para}"),
            "empty paragraph should include localId in directive: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(
            rt.content[0].attrs.as_ref().unwrap()["localId"],
            "empty-para"
        );
    }

    #[test]
    fn paragraph_localid_stripped_from_list_item() {
        // strip_local_ids should also strip paraLocalId
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","attrs":{"localId":"li-001"},"content":[{"type":"paragraph","attrs":{"localId":"p-001"},"content":[{"type":"text","text":"item"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(!md.contains("localId"), "localId should be stripped: {md}");
        assert!(
            !md.contains("paraLocalId"),
            "paraLocalId should be stripped: {md}"
        );
    }

    #[test]
    fn date_directive() {
        let doc = markdown_to_adf("Due by :date[2026-04-15].").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content[1].node_type, "date");
        // ISO date is converted to epoch milliseconds
        assert_eq!(
            content[1].attrs.as_ref().unwrap()["timestamp"],
            "1776211200000"
        );
    }

    #[test]
    fn adf_date_to_markdown() {
        // ADF dates use epoch ms; renderer converts back to ISO with timestamp attr
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::date("1776211200000")])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":date[2026-04-15]{timestamp=1776211200000}"));
    }

    #[test]
    fn adf_date_iso_passthrough() {
        // If ADF already has ISO date (legacy), pass through
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::date("2026-04-15")])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":date[2026-04-15]{timestamp=2026-04-15}"));
    }

    #[test]
    fn round_trip_date() {
        let md = "Due by :date[2026-04-15].\n";
        let doc = markdown_to_adf(md).unwrap();
        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains(":date[2026-04-15]"));
    }

    #[test]
    fn round_trip_date_non_midnight_timestamp() {
        // Issue #409: non-midnight timestamps must survive round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"date","attrs":{"timestamp":"1700000000000"}}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // JFM should include the original timestamp
        assert!(
            md.contains("timestamp=1700000000000"),
            "JFM should preserve original timestamp: {md}"
        );
        // Round-trip back to ADF
        let doc2 = markdown_to_adf(&md).unwrap();
        let content = doc2.content[0].content.as_ref().unwrap();
        assert_eq!(
            content[0].attrs.as_ref().unwrap()["timestamp"],
            "1700000000000",
            "Round-trip must preserve original non-midnight timestamp"
        );
    }

    #[test]
    fn date_epoch_ms_passthrough() {
        // If JFM date is already epoch ms, pass through
        let doc = markdown_to_adf("Due by :date[1776211200000].").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(
            content[1].attrs.as_ref().unwrap()["timestamp"],
            "1776211200000"
        );
    }

    #[test]
    fn date_timestamp_attr_preferred_over_content() {
        // When timestamp attr is present, it takes priority over the display date
        let md = ":date[2023-11-14]{timestamp=1700000000000}\n";
        let doc = markdown_to_adf(md).unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(
            content[0].attrs.as_ref().unwrap()["timestamp"],
            "1700000000000",
            "timestamp attr should be used directly"
        );
    }

    #[test]
    fn date_without_timestamp_attr_backward_compat() {
        // Legacy JFM without timestamp attr still works via iso_date_to_epoch_ms
        let md = ":date[2026-04-15]\n";
        let doc = markdown_to_adf(md).unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(
            content[0].attrs.as_ref().unwrap()["timestamp"],
            "1776211200000",
            "Should fall back to computing timestamp from date string"
        );
    }

    #[test]
    fn date_with_local_id_and_timestamp() {
        // Both localId and timestamp should round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"date","attrs":{"timestamp":"1700000000000","localId":"d-001"}}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("timestamp=1700000000000"),
            "Should contain timestamp: {md}"
        );
        assert!(md.contains("localId=d-001"), "Should contain localId: {md}");
        // Round-trip
        let doc2 = markdown_to_adf(&md).unwrap();
        let content = doc2.content[0].content.as_ref().unwrap();
        let attrs = content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["timestamp"], "1700000000000");
        assert_eq!(attrs["localId"], "d-001");
    }

    #[test]
    fn mention_directive() {
        let doc = markdown_to_adf("Assigned to :mention[Alice]{id=abc123}.").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content[1].node_type, "mention");
        assert_eq!(content[1].attrs.as_ref().unwrap()["id"], "abc123");
        assert_eq!(content[1].attrs.as_ref().unwrap()["text"], "Alice");
    }

    #[test]
    fn adf_mention_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::mention(
                "abc123", "Alice",
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":mention[Alice]{id=abc123}"));
    }

    #[test]
    fn round_trip_mention() {
        let md = "Assigned to :mention[Alice]{id=abc123}.\n";
        let doc = markdown_to_adf(md).unwrap();
        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains(":mention[Alice]{id=abc123}"));
    }

    #[test]
    fn mention_with_empty_access_level_round_trips() {
        // Issue #363: accessLevel="" produces accessLevel= which failed to parse
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"mention","attrs":{"id":"61921b41c15977006af2b1d1","text":"@Javier Inchausti","accessLevel":""}}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let mention = &round_tripped.content[0].content.as_ref().unwrap()[0];
        assert_eq!(
            mention.node_type, "mention",
            "mention with empty accessLevel was not parsed as mention, got: {}",
            mention.node_type
        );
    }

    #[test]
    fn span_with_color() {
        let doc = markdown_to_adf("This is :span[red text]{color=#ff5630}.").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content[1].node_type, "text");
        assert_eq!(content[1].text.as_deref(), Some("red text"));
        let marks = content[1].marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "textColor");
    }

    #[test]
    fn adf_text_color_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "red text",
                vec![AdfMark::text_color("#ff5630")],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":span[red text]{color=#ff5630}"));
    }

    #[test]
    fn round_trip_span_color() {
        let md = "This is :span[red text]{color=#ff5630}.\n";
        let doc = markdown_to_adf(md).unwrap();
        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains(":span[red text]{color=#ff5630}"));
    }

    #[test]
    fn text_color_and_link_marks_both_preserved() {
        // Issue #405: text with both textColor and link marks loses link on round-trip
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"red link","marks":[
            {"type":"link","attrs":{"href":"https://example.com"}},
            {"type":"textColor","attrs":{"color":"#ff0000"}}
          ]}
        ]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(":span[red link]{color=#ff0000}"),
            "JFM should contain span with color, got: {md}"
        );
        assert!(
            md.contains("](https://example.com)"),
            "JFM should contain link href, got: {md}"
        );
        // Full round-trip: both marks survive
        let rt = markdown_to_adf(&md).unwrap();
        let text_node = &rt.content[0].content.as_ref().unwrap()[0];
        let marks = text_node.marks.as_ref().expect("should have marks");
        assert!(
            marks.iter().any(|m| m.mark_type == "textColor"),
            "should have textColor mark, got: {:?}",
            marks.iter().map(|m| &m.mark_type).collect::<Vec<_>>()
        );
        assert!(
            marks.iter().any(|m| m.mark_type == "link"),
            "should have link mark, got: {:?}",
            marks.iter().map(|m| &m.mark_type).collect::<Vec<_>>()
        );
        // Verify attribute values survive
        let link_mark = marks.iter().find(|m| m.mark_type == "link").unwrap();
        assert_eq!(
            link_mark.attrs.as_ref().unwrap()["href"],
            "https://example.com"
        );
        let color_mark = marks.iter().find(|m| m.mark_type == "textColor").unwrap();
        assert_eq!(color_mark.attrs.as_ref().unwrap()["color"], "#ff0000");
    }

    #[test]
    fn bg_color_and_link_marks_both_preserved() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"highlighted link","marks":[
            {"type":"link","attrs":{"href":"https://example.com"}},
            {"type":"backgroundColor","attrs":{"color":"#ffff00"}}
          ]}
        ]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("bg=#ffff00"), "should have bg color: {md}");
        assert!(
            md.contains("](https://example.com)"),
            "should have link: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let text_node = &rt.content[0].content.as_ref().unwrap()[0];
        let marks = text_node.marks.as_ref().expect("should have marks");
        assert!(marks.iter().any(|m| m.mark_type == "backgroundColor"));
        assert!(marks.iter().any(|m| m.mark_type == "link"));
    }

    #[test]
    fn text_color_link_and_strong_rendering() {
        // Verify textColor + link + strong renders all three formatting elements
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"bold red link","marks":[
            {"type":"strong"},
            {"type":"link","attrs":{"href":"https://example.com"}},
            {"type":"textColor","attrs":{"color":"#ff0000"}}
          ]}
        ]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.starts_with("**") && md.trim().ends_with("**"),
            "should have bold wrapping: {md}"
        );
        assert!(md.contains("color=#ff0000"), "should have color: {md}");
        assert!(
            md.contains("](https://example.com)"),
            "should have link: {md}"
        );
    }

    #[test]
    fn subsup_and_link_marks_both_preserved() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"note","marks":[
            {"type":"link","attrs":{"href":"https://example.com"}},
            {"type":"subsup","attrs":{"type":"sup"}}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("sup"), "should have sup: {md}");
        assert!(
            md.contains("](https://example.com)"),
            "should have link: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let text_node = &rt.content[0].content.as_ref().unwrap()[0];
        let marks = text_node.marks.as_ref().expect("should have marks");
        assert!(marks.iter().any(|m| m.mark_type == "subsup"));
        assert!(marks.iter().any(|m| m.mark_type == "link"));
    }

    #[test]
    fn text_color_without_link_unchanged() {
        // Regression guard: textColor without link should still work
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"just red","marks":[
            {"type":"textColor","attrs":{"color":"#ff0000"}}
          ]}
        ]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":span[just red]{color=#ff0000}"), "md: {md}");
        assert!(!md.contains("](http"), "should NOT have link syntax: {md}");
    }

    #[test]
    fn inline_extension_directive() {
        let doc =
            markdown_to_adf("See :extension[fallback]{type=com.app key=widget} here.").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content[1].node_type, "inlineExtension");
        assert_eq!(
            content[1].attrs.as_ref().unwrap()["extensionType"],
            "com.app"
        );
        assert_eq!(content[1].attrs.as_ref().unwrap()["extensionKey"], "widget");
    }

    #[test]
    fn adf_inline_extension_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::inline_extension(
                "com.app",
                "widget",
                Some("fallback"),
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":extension[fallback]{type=com.app key=widget}"));
    }

    // ── Helper function tests ──────────────────────────────────────────

    #[test]
    fn parse_ordered_list_marker_valid() {
        let result = parse_ordered_list_marker("1. Hello");
        assert_eq!(result, Some((1, "Hello")));
    }

    #[test]
    fn parse_ordered_list_marker_high_number() {
        let result = parse_ordered_list_marker("42. Item");
        assert_eq!(result, Some((42, "Item")));
    }

    #[test]
    fn parse_ordered_list_marker_not_a_list() {
        assert!(parse_ordered_list_marker("not a list").is_none());
        assert!(parse_ordered_list_marker("1.no space").is_none());
    }

    #[test]
    fn is_list_start_various() {
        assert!(is_list_start("- item"));
        assert!(is_list_start("* item"));
        assert!(is_list_start("+ item"));
        assert!(is_list_start("1. item"));
        assert!(!is_list_start("not a list"));
    }

    #[test]
    fn is_horizontal_rule_various() {
        assert!(is_horizontal_rule("---"));
        assert!(is_horizontal_rule("***"));
        assert!(is_horizontal_rule("___"));
        assert!(is_horizontal_rule("------"));
        assert!(!is_horizontal_rule("--"));
        assert!(!is_horizontal_rule("abc"));
    }

    #[test]
    fn is_table_separator_valid() {
        assert!(is_table_separator("| --- | --- |"));
        assert!(is_table_separator("|:---:|:---|"));
        assert!(!is_table_separator("no pipes here"));
    }

    #[test]
    fn parse_table_row_cells() {
        let cells = parse_table_row("| A | B | C |");
        assert_eq!(cells, vec!["A", "B", "C"]);
    }

    #[test]
    fn parse_table_row_escaped_pipe_in_cell() {
        // Issue #579: `\|` inside a cell is a literal pipe, not a column separator.
        let cells = parse_table_row(r"| a\|b | c |");
        assert_eq!(cells, vec!["a|b", "c"]);
    }

    #[test]
    fn parse_table_row_escaped_pipe_in_code_span() {
        // Issue #579: `\|` inside an inline code span is unescaped at the row level.
        let cells = parse_table_row(r"| `parser.decode[T\|json]` | other |");
        assert_eq!(cells, vec!["`parser.decode[T|json]`", "other"]);
    }

    #[test]
    fn parse_table_row_preserves_other_backslashes() {
        // Only `\|` is special at the row-splitting level; other backslashes pass through.
        let cells = parse_table_row(r"| a\\b | c\*d |");
        assert_eq!(cells, vec![r"a\\b", r"c\*d"]);
    }

    #[test]
    fn parse_image_syntax_valid() {
        let result = parse_image_syntax("![alt](url)");
        assert_eq!(result, Some(("alt", "url")));
    }

    #[test]
    fn parse_image_syntax_not_image() {
        assert!(parse_image_syntax("not an image").is_none());
    }

    // ── find_closing_paren tests ────────────────────────────────────

    #[test]
    fn find_closing_paren_simple() {
        assert_eq!(find_closing_paren("(hello)", 0), Some(6));
    }

    #[test]
    fn find_closing_paren_nested() {
        assert_eq!(find_closing_paren("(a(b)c)", 0), Some(6));
    }

    #[test]
    fn find_closing_paren_unmatched() {
        assert_eq!(find_closing_paren("(no close", 0), None);
    }

    #[test]
    fn find_closing_paren_offset() {
        // Start scanning from the second '('
        assert_eq!(find_closing_paren("xx(inner)", 2), Some(8));
    }

    // ── Parentheses-in-URL tests (issue #509) ──────────────────────

    #[test]
    fn try_parse_link_url_with_parens() {
        let input = "[here](https://example.com/faq#access-(permissions)-rest)";
        let result = try_parse_link(input, 0);
        assert_eq!(
            result,
            Some((
                input.len(),
                "here",
                "https://example.com/faq#access-(permissions)-rest"
            ))
        );
    }

    #[test]
    fn try_parse_link_url_no_parens() {
        let input = "[text](https://example.com)";
        let result = try_parse_link(input, 0);
        assert_eq!(result, Some((input.len(), "text", "https://example.com")));
    }

    #[test]
    fn try_parse_link_url_with_multiple_nested_parens() {
        let input = "[x](http://en.wikipedia.org/wiki/Foo_(bar_(baz)))";
        let result = try_parse_link(input, 0);
        assert_eq!(
            result,
            Some((
                input.len(),
                "x",
                "http://en.wikipedia.org/wiki/Foo_(bar_(baz))"
            ))
        );
    }

    #[test]
    fn parse_image_syntax_url_with_parens() {
        let result = parse_image_syntax("![alt](https://example.com/page_(1))");
        assert_eq!(result, Some(("alt", "https://example.com/page_(1)")));
    }

    #[test]
    fn parse_image_syntax_url_no_parens() {
        let result = parse_image_syntax("![alt](https://example.com)");
        assert_eq!(result, Some(("alt", "https://example.com")));
    }

    #[test]
    fn link_with_parens_round_trip() {
        let href = "https://example.com/faq#I-need-access-(permissions)-added-in-Monitor";
        let mut text_node = AdfNode::text("here");
        text_node.marks = Some(vec![AdfMark::link(href)]);
        let adf_input = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![text_node])],
        };

        let jfm = adf_to_markdown(&adf_input).unwrap();
        let adf_output = markdown_to_adf(&jfm).unwrap();

        // Extract the href from the round-tripped ADF
        let para = &adf_output.content[0];
        let text_node = &para.content.as_ref().unwrap()[0];
        let mark = &text_node.marks.as_ref().unwrap()[0];
        let result_href = mark.attrs.as_ref().unwrap()["href"].as_str().unwrap();

        assert_eq!(result_href, href);
    }

    #[test]
    fn flush_plain_empty_range() {
        let mut nodes = Vec::new();
        flush_plain("hello", 3, 3, &mut nodes);
        assert!(nodes.is_empty());
    }

    #[test]
    fn add_mark_to_unmarked_node() {
        let mut node = AdfNode::text("test");
        add_mark(&mut node, AdfMark::strong());
        assert_eq!(node.marks.as_ref().unwrap().len(), 1);
    }

    #[test]
    fn add_mark_to_marked_node() {
        let mut node = AdfNode::text_with_marks("test", vec![AdfMark::strong()]);
        add_mark(&mut node, AdfMark::em());
        assert_eq!(node.marks.as_ref().unwrap().len(), 2);
    }

    // ── Directive table tests ──────────────────────────────────────

    #[test]
    fn directive_table_basic() {
        let md = "::::table\n:::tr\n:::th\nHeader 1\n:::\n:::th\nHeader 2\n:::\n:::\n:::tr\n:::td\nCell 1\n:::\n:::td\nCell 2\n:::\n:::\n::::\n";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content[0].node_type, "table");
        let rows = doc.content[0].content.as_ref().unwrap();
        assert_eq!(rows.len(), 2);
        assert_eq!(
            rows[0].content.as_ref().unwrap()[0].node_type,
            "tableHeader"
        );
        assert_eq!(rows[1].content.as_ref().unwrap()[0].node_type, "tableCell");
    }

    #[test]
    fn directive_table_with_block_content() {
        let md = "::::table\n:::tr\n:::td\nCell with list:\n\n- Item 1\n- Item 2\n:::\n:::td\nSimple cell\n:::\n:::\n::::\n";
        let doc = markdown_to_adf(md).unwrap();
        let rows = doc.content[0].content.as_ref().unwrap();
        let cell = &rows[0].content.as_ref().unwrap()[0];
        // Cell should have block content (paragraph + bullet list)
        let content = cell.content.as_ref().unwrap();
        assert!(content.len() >= 2);
        assert_eq!(content[1].node_type, "bulletList");
    }

    #[test]
    fn directive_table_with_cell_attrs() {
        let md = "::::table\n:::tr\n:::td{colspan=2 bg=#DEEBFF}\nSpanning cell\n:::\n:::\n::::\n";
        let doc = markdown_to_adf(md).unwrap();
        let cell = &doc.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let attrs = cell.attrs.as_ref().unwrap();
        assert_eq!(attrs["colspan"], 2);
        assert_eq!(attrs["background"], "#DEEBFF");
    }

    #[test]
    fn directive_table_with_css_var_background() {
        let bg = "var(--ds-background-accent-gray-subtlest, var(--ds-background-accent-gray-subtlest, #F1F2F4))";
        let md = format!("::::table\n:::tr\n:::th{{bg=\"{bg}\"}}\nHeader\n:::\n:::\n::::\n");
        let doc = markdown_to_adf(&md).unwrap();
        let row = &doc.content[0].content.as_ref().unwrap()[0];
        let cells = row.content.as_ref().unwrap();
        assert_eq!(cells.len(), 1, "row must have at least one cell");
        let attrs = cells[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["background"], bg);
    }

    #[test]
    fn css_var_background_round_trips() {
        let bg = "var(--ds-background-accent-gray-subtlest, #F1F2F4)";
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![AdfNode::table_row(vec![
                AdfNode::table_header_with_attrs(
                    vec![AdfNode::paragraph(vec![AdfNode::text("Header")])],
                    serde_json::json!({"background": bg}),
                ),
            ])])],
        };
        let md = adf_to_markdown(&adf).unwrap();
        assert!(
            md.contains(&format!("bg=\"{bg}\"")),
            "bg value must be quoted in markdown: {md}"
        );

        let round_tripped = markdown_to_adf(&md).unwrap();
        let row = &round_tripped.content[0].content.as_ref().unwrap()[0];
        let cells = row.content.as_ref().unwrap();
        assert_eq!(cells.len(), 1, "round-tripped row must have one cell");
        let rt_attrs = cells[0].attrs.as_ref().unwrap();
        assert_eq!(rt_attrs["background"], bg);
    }

    #[test]
    fn directive_table_with_table_attrs() {
        let md = "::::table{layout=wide numbered}\n:::tr\n:::td\nCell\n:::\n:::\n::::\n";
        let doc = markdown_to_adf(md).unwrap();
        let attrs = doc.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["layout"], "wide");
        assert_eq!(attrs["isNumberColumnEnabled"], true);
    }

    #[test]
    fn adf_table_with_block_content_renders_directive_form() {
        // Table with a bullet list in a cell → should render as ::::table directive
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![AdfNode::table_row(vec![
                AdfNode::table_cell(vec![
                    AdfNode::paragraph(vec![AdfNode::text("Cell with list:")]),
                    AdfNode::bullet_list(vec![AdfNode::list_item(vec![AdfNode::paragraph(vec![
                        AdfNode::text("Item 1"),
                    ])])]),
                ]),
            ])])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("::::table"));
        assert!(md.contains(":::td"));
        assert!(md.contains("- Item 1"));
    }

    #[test]
    fn adf_table_inline_only_renders_pipe_form() {
        // Table with only inline content → pipe table
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![
                AdfNode::table_row(vec![
                    AdfNode::table_header(vec![AdfNode::paragraph(vec![AdfNode::text("H1")])]),
                    AdfNode::table_header(vec![AdfNode::paragraph(vec![AdfNode::text("H2")])]),
                ]),
                AdfNode::table_row(vec![
                    AdfNode::table_cell(vec![AdfNode::paragraph(vec![AdfNode::text("C1")])]),
                    AdfNode::table_cell(vec![AdfNode::paragraph(vec![AdfNode::text("C2")])]),
                ]),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("| H1 | H2 |"));
        assert!(!md.contains("::::table"));
    }

    #[test]
    fn adf_table_header_outside_first_row_renders_directive() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![
                AdfNode::table_row(vec![
                    AdfNode::table_header(vec![AdfNode::paragraph(vec![AdfNode::text("H")])]),
                    AdfNode::table_cell(vec![AdfNode::paragraph(vec![AdfNode::text("C")])]),
                ]),
                AdfNode::table_row(vec![
                    AdfNode::table_header(vec![AdfNode::paragraph(vec![AdfNode::text("H2")])]),
                    AdfNode::table_cell(vec![AdfNode::paragraph(vec![AdfNode::text("C2")])]),
                ]),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("::::table"));
        assert!(md.contains(":::th"));
    }

    #[test]
    fn adf_table_cell_attrs_rendered() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![
                AdfNode::table_row(vec![AdfNode::table_header(vec![AdfNode::paragraph(vec![
                    AdfNode::text("H"),
                ])])]),
                AdfNode::table_row(vec![AdfNode::table_cell_with_attrs(
                    vec![AdfNode::paragraph(vec![AdfNode::text("C")])],
                    serde_json::json!({"background": "#DEEBFF", "colspan": 2}),
                )]),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("{colspan=2 bg=#DEEBFF}"));
    }

    // ── Pipe table cell attrs tests ────────────────────────────────

    #[test]
    fn pipe_table_cell_attrs() {
        let md = "| H1 | H2 |\n|---|---|\n| {bg=#DEEBFF} highlighted | normal |\n";
        let doc = markdown_to_adf(md).unwrap();
        let rows = doc.content[0].content.as_ref().unwrap();
        let cell = &rows[1].content.as_ref().unwrap()[0];
        let attrs = cell.attrs.as_ref().unwrap();
        assert_eq!(attrs["background"], "#DEEBFF");
    }

    #[test]
    fn pipe_table_cell_colspan() {
        let md = "| H1 | H2 |\n|---|---|\n| {colspan=2} spanning |\n";
        let doc = markdown_to_adf(md).unwrap();
        let rows = doc.content[0].content.as_ref().unwrap();
        let cell = &rows[1].content.as_ref().unwrap()[0];
        let attrs = cell.attrs.as_ref().unwrap();
        assert_eq!(attrs["colspan"], 2);
    }

    #[test]
    fn trailing_space_after_mention_in_table_cell_preserved() {
        // Issue #372: trailing space after mention in table cell was dropped
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default"},"content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[
          {"type":"mention","attrs":{"id":"aaa","text":"@Rob"}},
          {"type":"text","text":" "}
        ]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let cell = &round_tripped.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let para = &cell.content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        assert!(
            inlines.len() >= 2,
            "expected mention + text(' ') nodes, got {} nodes: {:?}",
            inlines.len(),
            inlines.iter().map(|n| &n.node_type).collect::<Vec<_>>()
        );
        assert_eq!(inlines[0].node_type, "mention");
        assert_eq!(inlines[1].node_type, "text");
        assert_eq!(inlines[1].text.as_deref(), Some(" "));
    }

    // ── Column alignment tests ─────────────────────────────────────

    #[test]
    fn pipe_table_column_alignment() {
        let md = "| Left | Center | Right |\n|:---|:---:|---:|\n| L | C | R |\n";
        let doc = markdown_to_adf(md).unwrap();
        let rows = doc.content[0].content.as_ref().unwrap();
        // Header row
        let h_cells = rows[0].content.as_ref().unwrap();
        // Left → no mark
        assert!(h_cells[0].content.as_ref().unwrap()[0].marks.is_none());
        // Center → alignment center
        let center_marks = h_cells[1].content.as_ref().unwrap()[0]
            .marks
            .as_ref()
            .unwrap();
        assert_eq!(center_marks[0].attrs.as_ref().unwrap()["align"], "center");
        // Right → alignment end
        let right_marks = h_cells[2].content.as_ref().unwrap()[0]
            .marks
            .as_ref()
            .unwrap();
        assert_eq!(right_marks[0].attrs.as_ref().unwrap()["align"], "end");
    }

    #[test]
    fn adf_table_alignment_roundtrip() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![
                AdfNode::table_row(vec![
                    AdfNode::table_header(vec![{
                        let mut p = AdfNode::paragraph(vec![AdfNode::text("Center")]);
                        p.marks = Some(vec![AdfMark::alignment("center")]);
                        p
                    }]),
                    AdfNode::table_header(vec![{
                        let mut p = AdfNode::paragraph(vec![AdfNode::text("Right")]);
                        p.marks = Some(vec![AdfMark::alignment("end")]);
                        p
                    }]),
                ]),
                AdfNode::table_row(vec![
                    AdfNode::table_cell(vec![{
                        let mut p = AdfNode::paragraph(vec![AdfNode::text("C")]);
                        p.marks = Some(vec![AdfMark::alignment("center")]);
                        p
                    }]),
                    AdfNode::table_cell(vec![{
                        let mut p = AdfNode::paragraph(vec![AdfNode::text("R")]);
                        p.marks = Some(vec![AdfMark::alignment("end")]);
                        p
                    }]),
                ]),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains(":---:"));
        assert!(md.contains("---:"));
    }

    // ── Panel custom attrs tests ───────────────────────────────────

    #[test]
    fn panel_custom_attrs_round_trip() {
        let md = ":::panel{type=custom icon=\":star:\" color=\"#DEEBFF\"}\nContent\n:::\n";
        let doc = markdown_to_adf(md).unwrap();
        let panel = &doc.content[0];
        let attrs = panel.attrs.as_ref().unwrap();
        assert_eq!(attrs["panelType"], "custom");
        assert_eq!(attrs["panelIcon"], ":star:");
        assert_eq!(attrs["panelColor"], "#DEEBFF");

        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains("type=custom"));
        assert!(result.contains("icon="));
        assert!(result.contains("color="));
    }

    // ── Block card with attrs tests ────────────────────────────────

    #[test]
    fn block_card_with_layout() {
        let md = "::card[https://example.com]{layout=wide}\n";
        let doc = markdown_to_adf(md).unwrap();
        let attrs = doc.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["layout"], "wide");

        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains("::card[https://example.com]{layout=wide}"));
    }

    // ── Extension params test ──────────────────────────────────────

    #[test]
    fn extension_with_params() {
        let md = r#"::extension{type=com.atlassian.macro key=jira-chart params='{"jql":"project=PROJ"}'}"#;
        let doc = markdown_to_adf(&format!("{md}\n")).unwrap();
        let attrs = doc.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["parameters"]["jql"], "project=PROJ");
    }

    #[test]
    fn leaf_extension_layout_preserved_in_roundtrip() {
        // Issue #381: layout attr on extension nodes was dropped
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"extension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"toc","layout":"default","parameters":{}}}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("layout=default"),
            "JFM should contain layout=default, got: {md}"
        );
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["layout"], "default", "layout should be preserved");
        assert_eq!(attrs["extensionKey"], "toc");
    }

    #[test]
    fn bodied_extension_layout_preserved_in_roundtrip() {
        // Bodied extension with layout
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"bodiedExtension","attrs":{"extensionType":"com.atlassian.macro","extensionKey":"expand","layout":"wide"},
           "content":[{"type":"paragraph","content":[{"type":"text","text":"inner"}]}]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("layout=wide"),
            "JFM should contain layout=wide, got: {md}"
        );
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["layout"], "wide", "layout should be preserved");
    }

    #[test]
    fn bodied_extension_parameters_preserved_in_roundtrip() {
        // Issue #473: parameters block inside bodiedExtension.attrs was dropped
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"bodiedExtension","attrs":{"extensionType":"com.atlassian.confluence.macro.core","extensionKey":"details","layout":"default","localId":"aabbccdd-1234","parameters":{"macroMetadata":{"macroId":{"value":"bbccddee-2345"},"schemaVersion":{"value":"1"},"title":"Page Properties"},"macroParams":{}}},
           "content":[{"type":"paragraph","content":[{"type":"text","text":"Content inside bodied extension"}]}]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("params="),
            "JFM should contain params attribute, got: {md}"
        );
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(
            attrs["parameters"]["macroMetadata"]["title"], "Page Properties",
            "parameters should be preserved in round-trip"
        );
        assert_eq!(attrs["extensionKey"], "details");
        assert_eq!(attrs["layout"], "default");
        assert_eq!(attrs["localId"], "aabbccdd-1234");
    }

    #[test]
    fn bodied_extension_malformed_params_ignored() {
        // Malformed params JSON should be silently ignored, not crash
        let md = ":::extension{type=com.atlassian.macro key=details params='not-valid-json'}\nContent\n:::\n";
        let doc = markdown_to_adf(md).unwrap();
        let attrs = doc.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["extensionKey"], "details");
        // parameters should be absent since the JSON was invalid
        assert!(attrs.get("parameters").is_none());
    }

    #[test]
    fn leaf_extension_localid_preserved_in_roundtrip() {
        // Extension with both layout and localId
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"extension","attrs":{"extensionType":"com.atlassian.macro","extensionKey":"toc","layout":"default","localId":"abc-123"}}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["layout"], "default");
        assert_eq!(attrs["localId"], "abc-123");
    }

    // ── Mention with userType test ─────────────────────────────────

    #[test]
    fn mention_with_user_type() {
        let md = "Hi :mention[Alice]{id=abc123 userType=DEFAULT}.\n";
        let doc = markdown_to_adf(md).unwrap();
        let mention = &doc.content[0].content.as_ref().unwrap()[1];
        assert_eq!(mention.attrs.as_ref().unwrap()["userType"], "DEFAULT");

        let result = adf_to_markdown(&doc).unwrap();
        assert!(result.contains("userType=DEFAULT"));
    }

    // ── Colwidth tests ─────────────────────────────────────────────

    #[test]
    fn directive_table_colwidth() {
        let md = "::::table\n:::tr\n:::td{colwidth=100,200}\nCell\n:::\n:::\n::::\n";
        let doc = markdown_to_adf(md).unwrap();
        let cell = &doc.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let colwidth = cell.attrs.as_ref().unwrap()["colwidth"].as_array().unwrap();
        assert_eq!(colwidth, &[serde_json::json!(100), serde_json::json!(200)]);
    }

    #[test]
    fn directive_table_colwidth_float_roundtrip() {
        // Confluence returns colwidth as floats (e.g. 157.0, 863.0).
        // adf_to_markdown must preserve them so markdown_to_adf can restore them.
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "table",
                "content": [{
                    "type": "tableRow",
                    "content": [
                        {
                            "type": "tableHeader",
                            "attrs": { "colwidth": [157.0] },
                            "content": [{ "type": "paragraph" }]
                        },
                        {
                            "type": "tableHeader",
                            "attrs": { "colwidth": [863.0] },
                            "content": [{ "type": "paragraph" }]
                        }
                    ]
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("colwidth=157.0"),
            "expected colwidth=157.0 in markdown, got: {md}"
        );
        assert!(
            md.contains("colwidth=863.0"),
            "expected colwidth=863.0 in markdown, got: {md}"
        );
        // Round-trip back to ADF
        let doc2 = markdown_to_adf(&md).unwrap();
        let row = &doc2.content[0].content.as_ref().unwrap()[0];
        let header1 = &row.content.as_ref().unwrap()[0];
        let header2 = &row.content.as_ref().unwrap()[1];
        assert_eq!(
            header1.attrs.as_ref().unwrap()["colwidth"]
                .as_array()
                .unwrap(),
            &[serde_json::json!(157.0)]
        );
        assert_eq!(
            header2.attrs.as_ref().unwrap()["colwidth"]
                .as_array()
                .unwrap(),
            &[serde_json::json!(863.0)]
        );
    }

    #[test]
    fn colwidth_float_preserved_in_roundtrip() {
        // Issue #369: colwidth 254.0 was coerced to integer 254
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default"},"content":[{"type":"tableRow","content":[{"type":"tableHeader","attrs":{"colwidth":[254.0,416.0]},"content":[{"type":"paragraph","content":[]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let cell = &round_tripped.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let colwidth = cell.attrs.as_ref().unwrap()["colwidth"].as_array().unwrap();
        assert_eq!(
            colwidth,
            &[serde_json::json!(254.0), serde_json::json!(416.0)],
            "colwidth should preserve float values"
        );
    }

    #[test]
    fn colwidth_integer_preserved_in_roundtrip() {
        // Issue #459: colwidth integer values emitted as floats after round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colspan":1,"colwidth":[150],"rowspan":1},"content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("colwidth=150"),
            "expected colwidth=150 (no decimal) in markdown, got: {md}"
        );
        assert!(
            !md.contains("colwidth=150.0"),
            "colwidth should not have .0 suffix for integers, got: {md}"
        );
        // Round-trip back to ADF
        let round_tripped = markdown_to_adf(&md).unwrap();
        let cell = &round_tripped.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let colwidth = cell.attrs.as_ref().unwrap()["colwidth"].as_array().unwrap();
        assert_eq!(
            colwidth,
            &[serde_json::json!(150)],
            "colwidth should preserve integer values"
        );
        // Verify JSON serialization uses integer, not float
        let json_output = serde_json::to_string(&round_tripped).unwrap();
        assert!(
            json_output.contains(r#""colwidth":[150]"#),
            "JSON should contain integer colwidth, got: {json_output}"
        );
    }

    #[test]
    fn colwidth_mixed_int_and_float_roundtrip() {
        // Integer colwidth from standard ADF and float colwidth from Confluence
        // should each preserve their original type through round-trip.
        let int_json = r#"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colwidth":[100,200]}}]}]}]}"#;
        let float_json = r#"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colwidth":[100.0,200.0]}}]}]}]}"#;

        // Integer input → integer output
        let int_doc: AdfDocument = serde_json::from_str(int_json).unwrap();
        let int_md = adf_to_markdown(&int_doc).unwrap();
        assert!(
            int_md.contains("colwidth=100,200"),
            "integer colwidth in md: {int_md}"
        );
        let int_rt = markdown_to_adf(&int_md).unwrap();
        let int_serial = serde_json::to_string(&int_rt).unwrap();
        assert!(
            int_serial.contains(r#""colwidth":[100,200]"#),
            "integer colwidth in JSON: {int_serial}"
        );

        // Float input → float output
        let float_doc: AdfDocument = serde_json::from_str(float_json).unwrap();
        let float_md = adf_to_markdown(&float_doc).unwrap();
        assert!(
            float_md.contains("colwidth=100.0,200.0"),
            "float colwidth in md: {float_md}"
        );
        let float_rt = markdown_to_adf(&float_md).unwrap();
        let float_serial = serde_json::to_string(&float_rt).unwrap();
        assert!(
            float_serial.contains(r#""colwidth":[100.0,200.0]"#),
            "float colwidth in JSON: {float_serial}"
        );
    }

    #[test]
    fn colwidth_fractional_float_preserved() {
        // Covers the fractional-float branch (n.fract() != 0.0) in build_cell_attrs_string
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colwidth":[100.5]},"content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("colwidth=100.5"),
            "expected colwidth=100.5 in markdown, got: {md}"
        );
    }

    #[test]
    fn colwidth_non_numeric_values_skipped() {
        // Covers the None branch for non-numeric colwidth entries in build_cell_attrs_string
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "table",
                "content": [{
                    "type": "tableRow",
                    "content": [{
                        "type": "tableCell",
                        "attrs": { "colwidth": ["invalid"] },
                        "content": [{ "type": "paragraph", "content": [{ "type": "text", "text": "cell" }] }]
                    }]
                }]
            }]
        });
        let doc: AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // Non-numeric values are filtered out, so colwidth should not appear
        assert!(
            !md.contains("colwidth"),
            "non-numeric colwidth should be filtered out, got: {md}"
        );
    }

    #[test]
    fn default_rowspan_colspan_preserved_in_roundtrip() {
        // Issue #369: rowspan=1 and colspan=1 were elided
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default"},"content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{"rowspan":1,"colspan":1},"content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let cell = &round_tripped.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let attrs = cell.attrs.as_ref().unwrap();
        assert_eq!(attrs["rowspan"], 1, "rowspan=1 should be preserved");
        assert_eq!(attrs["colspan"], 1, "colspan=1 should be preserved");
    }

    // ── Nested list tests ──────────────────────────────────────────────

    #[test]
    fn table_localid_preserved_in_roundtrip() {
        // Issue #374: localId on table nodes was dropped
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default","localId":"7afd4550-e66c-4b12-875f-a91c6c7b62c7"},"content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId="),
            "JFM should contain localId, got: {md}"
        );
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(
            attrs["localId"], "7afd4550-e66c-4b12-875f-a91c6c7b62c7",
            "localId should be preserved"
        );
    }

    #[test]
    fn paragraph_localid_preserved_in_roundtrip() {
        // Issue #399: localId on paragraph nodes was dropped
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"paragraph","attrs":{"localId":"abc-123"},"content":[{"type":"text","text":"hello"}]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=abc-123"),
            "JFM should contain localId, got: {md}"
        );
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["localId"], "abc-123", "localId should be preserved");
    }

    #[test]
    fn heading_localid_preserved_in_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"heading","attrs":{"level":2,"localId":"h-456"},"content":[{"type":"text","text":"Title"}]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["localId"], "h-456");
    }

    #[test]
    fn localid_with_alignment_preserved() {
        // localId and alignment marks should coexist in the same {attrs} block
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"paragraph","attrs":{"localId":"p-789"},"marks":[{"type":"alignment","attrs":{"align":"center"}}],
           "content":[{"type":"text","text":"centered"}]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("localId=p-789"), "should have localId: {md}");
        assert!(md.contains("align=center"), "should have align: {md}");
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["localId"], "p-789");
        let marks = round_tripped.content[0].marks.as_ref().unwrap();
        assert!(marks.iter().any(|m| m.mark_type == "alignment"));
    }

    #[test]
    fn table_layout_default_preserved_in_roundtrip() {
        // Issue #380: layout='default' was elided
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default"},"content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(
            attrs["layout"], "default",
            "layout='default' should be preserved"
        );
    }

    #[test]
    fn table_is_number_column_enabled_false_preserved() {
        // Issue #380: isNumberColumnEnabled=false was elided
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default"},"content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(
            attrs["isNumberColumnEnabled"], false,
            "isNumberColumnEnabled=false should be preserved"
        );
    }

    #[test]
    fn table_is_number_column_enabled_true_preserved() {
        // Regression check: isNumberColumnEnabled=true should still work
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":true,"layout":"default"},"content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(
            attrs["isNumberColumnEnabled"], true,
            "isNumberColumnEnabled=true should be preserved"
        );
    }

    #[test]
    fn directive_table_is_number_column_enabled_false_preserved() {
        // Covers render_directive_table + directive table parsing for numbered=false.
        // Multi-paragraph cell forces directive table form.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default"},"content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[
          {"type":"paragraph","content":[{"type":"text","text":"line one"}]},
          {"type":"paragraph","content":[{"type":"text","text":"line two"}]}
        ]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("::::table"), "should use directive table form");
        assert!(
            md.contains("numbered=false"),
            "should contain numbered=false, got: {md}"
        );
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["isNumberColumnEnabled"], false);
        assert_eq!(attrs["layout"], "default");
    }

    #[test]
    fn directive_table_is_number_column_enabled_true_preserved() {
        // Covers render_directive_table + directive table parsing for numbered (true).
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":true,"layout":"default"},"content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[
          {"type":"paragraph","content":[{"type":"text","text":"line one"}]},
          {"type":"paragraph","content":[{"type":"text","text":"line two"}]}
        ]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("::::table"), "should use directive table form");
        assert!(
            md.contains("numbered}") || md.contains("numbered "),
            "should contain numbered flag, got: {md}"
        );
        let round_tripped = markdown_to_adf(&md).unwrap();
        let attrs = round_tripped.content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["isNumberColumnEnabled"], true);
    }

    #[test]
    fn trailing_space_in_bullet_list_item_preserved() {
        // Issue #394: trailing space text node in list item dropped
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[{"type":"paragraph","content":[
            {"type":"text","text":"Before link "},
            {"type":"text","text":"link text","marks":[{"type":"link","attrs":{"href":"https://example.com"}}]},
            {"type":"text","text":" "}
          ]}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let list = &round_tripped.content[0];
        let item = &list.content.as_ref().unwrap()[0];
        let para = &item.content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        let last = inlines.last().unwrap();
        assert_eq!(
            last.text.as_deref(),
            Some(" "),
            "trailing space text node should be preserved, got nodes: {:?}",
            inlines
                .iter()
                .map(|n| (&n.node_type, &n.text))
                .collect::<Vec<_>>()
        );
    }

    #[test]
    fn trailing_space_after_mention_in_bullet_list_preserved() {
        // Mention + trailing space in list item
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[{"type":"paragraph","content":[
            {"type":"mention","attrs":{"id":"abc","text":"@Alice"}},
            {"type":"text","text":" "}
          ]}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let para = &round_tripped.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        assert!(
            inlines.len() >= 2,
            "should have mention + trailing space, got {} nodes",
            inlines.len()
        );
        assert_eq!(inlines.last().unwrap().text.as_deref(), Some(" "));
    }

    #[test]
    fn trailing_space_in_ordered_list_item_preserved() {
        // Same issue in ordered list context
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[
          {"type":"listItem","content":[{"type":"paragraph","content":[
            {"type":"text","text":"item "},
            {"type":"text","text":"link","marks":[{"type":"link","attrs":{"href":"https://example.com"}}]},
            {"type":"text","text":" "}
          ]}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let para = &round_tripped.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        let last = inlines.last().unwrap();
        assert_eq!(
            last.text.as_deref(),
            Some(" "),
            "trailing space should be preserved in ordered list item"
        );
    }

    #[test]
    fn trailing_space_in_heading_text_preserved() {
        // Issue #400: trailing space in heading text node trimmed on round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"heading","attrs":{"level":1},"content":[
          {"type":"text","text":"Firefighting Engineers "}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let inlines = round_tripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            inlines[0].text.as_deref(),
            Some("Firefighting Engineers "),
            "trailing space in heading should be preserved"
        );
    }

    #[test]
    fn trailing_space_in_heading_before_bold_preserved() {
        // Issue #400: trailing space before bold sibling in heading
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"heading","attrs":{"level":2},"content":[
          {"type":"text","text":"Classic "},
          {"type":"text","text":"bold","marks":[{"type":"strong"}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let inlines = round_tripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            inlines[0].text.as_deref(),
            Some("Classic "),
            "trailing space in heading text before bold should be preserved"
        );
    }

    #[test]
    fn leading_space_in_heading_text_preserved() {
        // Issue #492: leading spaces in heading text node stripped on round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"heading","attrs":{"level":3},"content":[
          {"type":"text","text":"  #general-channel"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let inlines = round_tripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            inlines[0].text.as_deref(),
            Some("  #general-channel"),
            "leading spaces in heading text should be preserved"
        );
    }

    #[test]
    fn leading_space_in_heading_before_bold_preserved() {
        // Issue #492: leading space before bold sibling in heading
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"heading","attrs":{"level":2},"content":[
          {"type":"text","text":"   indented"},
          {"type":"text","text":" bold","marks":[{"type":"strong"}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let inlines = round_tripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            inlines[0].text.as_deref(),
            Some("   indented"),
            "leading spaces in heading text before bold should be preserved"
        );
    }

    #[test]
    fn heading_multiple_leading_spaces_markdown_parse() {
        // Issue #492: verify JFM parsing preserves leading spaces
        let md = "### \t  #general-channel";
        let doc = markdown_to_adf(md).unwrap();
        let inlines = doc.content[0].content.as_ref().unwrap();
        assert_eq!(
            inlines[0].text.as_deref(),
            Some("\t  #general-channel"),
            "leading whitespace in heading text should be preserved during JFM parsing"
        );
    }

    #[test]
    fn trailing_space_in_paragraph_text_preserved() {
        // Issue #400: trailing space in paragraph text node preserved on round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"word followed by space "},
          {"type":"text","text":"next node","marks":[{"type":"strong"}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let inlines = round_tripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            inlines[0].text.as_deref(),
            Some("word followed by space "),
            "trailing space in paragraph text should be preserved"
        );
    }

    #[test]
    fn nested_bullet_list_roundtrip() {
        // ADF with a listItem containing a paragraph + nested bulletList
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "bulletList",
                "content": [{
                    "type": "listItem",
                    "content": [
                        {
                            "type": "paragraph",
                            "content": [{"type": "text", "text": "parent item"}]
                        },
                        {
                            "type": "bulletList",
                            "content": [
                                {
                                    "type": "listItem",
                                    "content": [{
                                        "type": "paragraph",
                                        "content": [{"type": "text", "text": "sub item 1"}]
                                    }]
                                },
                                {
                                    "type": "listItem",
                                    "content": [{
                                        "type": "paragraph",
                                        "content": [{"type": "text", "text": "sub item 2"}]
                                    }]
                                }
                            ]
                        }
                    ]
                }]
            }]
        });
        let doc: AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("- parent item\n"),
            "expected top-level item in markdown, got: {md}"
        );
        assert!(
            md.contains("  - sub item 1\n"),
            "expected indented sub item 1 in markdown, got: {md}"
        );
        assert!(
            md.contains("  - sub item 2\n"),
            "expected indented sub item 2 in markdown, got: {md}"
        );

        // Round-trip back
        let doc2 = markdown_to_adf(&md).unwrap();
        let list = &doc2.content[0];
        assert_eq!(list.node_type, "bulletList");
        let item = &list.content.as_ref().unwrap()[0];
        assert_eq!(item.node_type, "listItem");
        let item_content = item.content.as_ref().unwrap();
        assert_eq!(
            item_content.len(),
            2,
            "listItem should have paragraph + nested list"
        );
        assert_eq!(item_content[0].node_type, "paragraph");
        assert_eq!(item_content[1].node_type, "bulletList");
        let sub_items = item_content[1].content.as_ref().unwrap();
        assert_eq!(sub_items.len(), 2);
    }

    #[test]
    fn nested_bullet_in_table_cell_roundtrip() {
        let md = "::::table\n:::tr\n:::td\n- parent\n  - child\n:::\n:::\n::::\n";
        let doc = markdown_to_adf(md).unwrap();
        let table = &doc.content[0];
        let row = &table.content.as_ref().unwrap()[0];
        let cell = &row.content.as_ref().unwrap()[0];
        let list = &cell.content.as_ref().unwrap()[0];
        assert_eq!(list.node_type, "bulletList");
        let item = &list.content.as_ref().unwrap()[0];
        let item_content = item.content.as_ref().unwrap();
        assert_eq!(
            item_content.len(),
            2,
            "listItem should have paragraph + nested list"
        );
        assert_eq!(item_content[1].node_type, "bulletList");

        // Round-trip: adf→md→adf should preserve the nested list
        let md2 = adf_to_markdown(&doc).unwrap();
        assert!(
            md2.contains("  - child"),
            "expected indented child in round-tripped markdown, got: {md2}"
        );
    }

    #[test]
    fn nested_ordered_list_roundtrip() {
        // Issue #389: nested orderedList inside listItem flattened
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[
          {"type":"listItem","content":[
            {"type":"paragraph","content":[{"type":"text","text":"Top level"}]},
            {"type":"orderedList","attrs":{"order":1},"content":[
              {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Nested 1"}]}]},
              {"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Nested 2"}]}]}
            ]}
          ]},
          {"type":"listItem","content":[
            {"type":"paragraph","content":[{"type":"text","text":"Second top"}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();

        // Outer list should have 2 items
        let outer = &round_tripped.content[0];
        assert_eq!(outer.node_type, "orderedList");
        assert_eq!(
            outer.attrs.as_ref().unwrap()["order"],
            1,
            "explicit order=1 must be preserved via trailing {{order=1}} (issue #547)"
        );
        let outer_items = outer.content.as_ref().unwrap();
        assert_eq!(
            outer_items.len(),
            2,
            "outer list should have 2 items, got {}",
            outer_items.len()
        );

        // First item should have paragraph + nested orderedList
        let first_item = &outer_items[0];
        let first_content = first_item.content.as_ref().unwrap();
        assert_eq!(
            first_content.len(),
            2,
            "first listItem should have paragraph + nested list, got {}",
            first_content.len()
        );
        assert_eq!(first_content[0].node_type, "paragraph");
        assert_eq!(first_content[1].node_type, "orderedList");
        let nested_items = first_content[1].content.as_ref().unwrap();
        assert_eq!(nested_items.len(), 2, "nested list should have 2 items");
    }

    #[test]
    fn nested_ordered_list_markdown_parsing() {
        // Direct markdown parsing of nested ordered list
        let md = "1. Top level\n  1. Nested 1\n  2. Nested 2\n2. Second top\n";
        let doc = markdown_to_adf(md).unwrap();
        let outer = &doc.content[0];
        assert_eq!(outer.node_type, "orderedList");
        let outer_items = outer.content.as_ref().unwrap();
        assert_eq!(outer_items.len(), 2, "should have 2 top-level items");

        let first_content = outer_items[0].content.as_ref().unwrap();
        assert_eq!(
            first_content.len(),
            2,
            "first item should have paragraph + nested list"
        );
        assert_eq!(first_content[1].node_type, "orderedList");
    }

    #[test]
    fn bullet_list_nested_inside_ordered_list() {
        // Mixed nesting: bullet list nested inside ordered list
        let md = "1. Ordered item\n  - Bullet child 1\n  - Bullet child 2\n2. Second ordered\n";
        let doc = markdown_to_adf(md).unwrap();
        let outer = &doc.content[0];
        assert_eq!(outer.node_type, "orderedList");
        let outer_items = outer.content.as_ref().unwrap();
        assert_eq!(outer_items.len(), 2);

        let first_content = outer_items[0].content.as_ref().unwrap();
        assert_eq!(
            first_content.len(),
            2,
            "first item should have paragraph + nested list"
        );
        assert_eq!(first_content[1].node_type, "bulletList");
        let sub_items = first_content[1].content.as_ref().unwrap();
        assert_eq!(sub_items.len(), 2, "nested bullet list should have 2 items");
    }

    #[test]
    fn ordered_list_order_attr_one_is_elided() {
        // Issue #547: order=1 is the default and must be elided from attrs
        // for round-trip fidelity with ADF documents that omit the attrs
        // object on orderedList.
        let md = "1. A\n2. B\n";
        let doc = markdown_to_adf(md).unwrap();
        assert!(
            doc.content[0].attrs.is_none(),
            "attrs should be elided when order=1"
        );

        // Round-trip should preserve the elision
        let md2 = adf_to_markdown(&doc).unwrap();
        let doc2 = markdown_to_adf(&md2).unwrap();
        assert!(
            doc2.content[0].attrs.is_none(),
            "attrs should remain elided after round-trip"
        );
    }

    #[test]
    fn issue_547_ordered_list_no_attrs_roundtrip_byte_identical() {
        // Issue #547: ADF orderedList without an attrs field must round-trip
        // (ADF → JFM → ADF) without gaining a spurious {"order": 1} attrs.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"First item"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Second item"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        assert!(
            rt.content[0].attrs.is_none(),
            "round-tripped orderedList should not have attrs, got: {:?}",
            rt.content[0].attrs
        );

        // Serialized JSON must also omit attrs entirely for byte fidelity.
        let rt_json = serde_json::to_string(&rt).unwrap();
        assert!(
            !rt_json.contains("\"order\""),
            "round-tripped JSON should not contain \"order\", got: {rt_json}"
        );
    }

    // ── Issue #547: orderedList byte-identical roundtrip coverage ───────

    /// Assert that ADF → JFM → ADF produces a document whose serialized JSON
    /// (as a sorted-key canonical form) matches the source JSON. Mirrors the
    /// `jq --sort-keys` comparison used in the issue's reproducer.
    fn assert_roundtrip_byte_identical(adf_json: &str) {
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let canonical_src: serde_json::Value = serde_json::from_str(adf_json).unwrap();
        let canonical_rt: serde_json::Value =
            serde_json::from_str(&serde_json::to_string(&rt).unwrap()).unwrap();
        assert_eq!(
            canonical_src, canonical_rt,
            "round-trip diverged\n  src: {canonical_src}\n   rt: {canonical_rt}\n   md: {md:?}"
        );
    }

    #[test]
    fn issue_547_single_item_no_attrs_roundtrip() {
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"only"}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_many_items_no_attrs_roundtrip() {
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"A"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"B"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"C"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"D"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"E"}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_non_default_order_preserved() {
        // When order != 1, attrs must still be serialized (fix must not
        // over-eagerly drop attrs).
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":5},"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"fifth"}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_nested_ordered_in_ordered_no_attrs_roundtrip() {
        // Outer and inner both omit attrs; fix must apply at every level.
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"outer"}]},{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"inner"}]}]}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_ordered_nested_in_bullet_no_attrs_roundtrip() {
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"bullet"}]},{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"nested"}]}]}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_bullet_nested_in_ordered_no_attrs_roundtrip() {
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"outer"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"nested"}]}]}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_ordered_list_between_paragraphs_roundtrip() {
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"intro"}]},{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"item"}]}]}]},{"type":"paragraph","content":[{"type":"text","text":"outro"}]}]}"#,
        );
    }

    #[test]
    fn issue_547_ordered_list_with_marked_text_roundtrip() {
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"bold","marks":[{"type":"strong"}]}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_ordered_list_with_link_roundtrip() {
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"site","marks":[{"type":"link","attrs":{"href":"https://example.com"}}]}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_ordered_list_with_hardbreak_roundtrip() {
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"},{"type":"hardBreak"},{"type":"text","text":"b"}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_triple_nested_ordered_roundtrip() {
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"L1"}]},{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"L2"}]},{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"L3"}]}]}]}]}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_ordered_list_heading_rule_mix_roundtrip() {
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"heading","attrs":{"level":2},"content":[{"type":"text","text":"Title"}]},{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"x"}]}]}]},{"type":"rule"}]}"#,
        );
    }

    #[test]
    fn issue_547_ordered_list_listitem_localid_roundtrip() {
        // listItem attrs must coexist with the no-attrs outer orderedList.
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","attrs":{"localId":"li-001"},"content":[{"type":"paragraph","content":[{"type":"text","text":"first"}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_explicit_order_one_preserved_roundtrip() {
        // Inverse regression (see PR #562 comment 4266630848): when the source
        // ADF has an explicit `"attrs": {"order": 1}` the round-trip must
        // preserve it, not strip it. A trailing `{order=1}` signal on the
        // rendered markdown distinguishes explicit-default from omitted attrs.
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"First item"}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_explicit_order_one_nested_preserved_roundtrip() {
        // Both outer and inner orderedList have explicit `order: 1`; both must
        // be preserved across the round-trip independently.
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"outer"}]},{"type":"orderedList","attrs":{"order":1},"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"inner"}]}]}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_mixed_explicit_and_implicit_order_roundtrip() {
        // Sibling orderedLists with different attrs presence must round-trip
        // independently: first has explicit `order: 1`, second omits attrs.
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a"}]}]}]},{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"b"}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_explicit_order_one_with_listitem_localid_roundtrip() {
        // Explicit `order: 1` outer, plus a listItem `localId` inside — the
        // trailing `{order=1}` line must not swallow or collide with listItem
        // attrs.
        assert_roundtrip_byte_identical(
            r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[{"type":"listItem","attrs":{"localId":"li-1"},"content":[{"type":"paragraph","content":[{"type":"text","text":"first"}]}]}]}]}"#,
        );
    }

    #[test]
    fn issue_547_order_attr_signal_appears_only_for_explicit_one() {
        // Render-layer guard: `{order=1}` appears in markdown only when the
        // source ADF has explicit `attrs.order=1`. No signal for attrs=None,
        // no signal for attrs.order>1 (marker already encodes the value).
        let no_attrs = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"x"}]}]}]}]}"#;
        let explicit_one = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"x"}]}]}]}]}"#;
        let order_five = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":5},"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"x"}]}]}]}]}"#;

        let md_no =
            adf_to_markdown(&serde_json::from_str::<AdfDocument>(no_attrs).unwrap()).unwrap();
        let md_one =
            adf_to_markdown(&serde_json::from_str::<AdfDocument>(explicit_one).unwrap()).unwrap();
        let md_five =
            adf_to_markdown(&serde_json::from_str::<AdfDocument>(order_five).unwrap()).unwrap();

        assert!(
            !md_no.contains("{order="),
            "no-attrs source must not emit order signal, got: {md_no:?}"
        );
        assert!(
            md_one.contains("{order=1}"),
            "explicit order=1 must emit trailing signal, got: {md_one:?}"
        );
        assert!(
            !md_five.contains("{order="),
            "order=5 is already encoded by marker; must not emit signal, got: {md_five:?}"
        );
    }

    // ── File media round-trip tests ─────────────────────────────────────

    #[test]
    fn file_media_roundtrip() {
        // ADF with a Confluence file attachment (type:file media)
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center"},
                "content": [{
                    "type": "media",
                    "attrs": {
                        "type": "file",
                        "id": "6e8ebc85-81a3-4b4c-865a-ec4dd8978c2d",
                        "collection": "contentId-8220672100",
                        "height": 56,
                        "width": 312,
                        "alt": "Screenshot.png"
                    }
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("type=file"),
            "expected type=file in markdown, got: {md}"
        );
        assert!(
            md.contains("id=6e8ebc85-81a3-4b4c-865a-ec4dd8978c2d"),
            "expected id in markdown, got: {md}"
        );
        assert!(
            md.contains("collection=contentId-8220672100"),
            "expected collection in markdown, got: {md}"
        );
        // Round-trip back to ADF
        let doc2 = markdown_to_adf(&md).unwrap();
        let ms = &doc2.content[0];
        assert_eq!(ms.node_type, "mediaSingle");
        let media = &ms.content.as_ref().unwrap()[0];
        assert_eq!(media.node_type, "media");
        let attrs = media.attrs.as_ref().unwrap();
        assert_eq!(attrs["type"], "file");
        assert_eq!(attrs["id"], "6e8ebc85-81a3-4b4c-865a-ec4dd8978c2d");
        assert_eq!(attrs["collection"], "contentId-8220672100");
        assert_eq!(attrs["height"], 56);
        assert_eq!(attrs["width"], 312);
        assert_eq!(attrs["alt"], "Screenshot.png");
    }

    /// Issue #550: roundtrip of mediaSingle with file-type media preserves all
    /// file attributes (type, id, collection, width, height). Regression guard
    /// for the exact reproducer in the issue body.
    #[test]
    fn file_media_roundtrip_issue_550_reproducer() {
        let adf_json = r#"{
          "version": 1,
          "type": "doc",
          "content": [
            {
              "type": "mediaSingle",
              "attrs": {"layout": "center"},
              "content": [
                {
                  "type": "media",
                  "attrs": {
                    "type": "file",
                    "id": "abc-123-def-456",
                    "collection": "my-collection",
                    "width": 941,
                    "height": 655
                  }
                }
              ]
            }
          ]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let expected: serde_json::Value = serde_json::from_str(adf_json).unwrap();
        let actual = serde_json::to_value(&rt).unwrap();
        assert_eq!(
            actual, expected,
            "roundtrip should preserve file media attrs; md was:\n{md}"
        );
    }

    /// Issue #550 (updated reproducer): roundtrip of a file-media `id`
    /// containing spaces must not truncate the value. Before the fix, the
    /// JFM renderer emitted `id=abc 123 def 456` unquoted and the parser
    /// treated the first space as a value terminator, so the `id` became
    /// `"abc"` after round-trip.
    #[test]
    fn file_media_roundtrip_id_with_spaces() {
        let adf_json = r#"{
          "version": 1,
          "type": "doc",
          "content": [
            {
              "type": "mediaSingle",
              "attrs": {"layout": "center"},
              "content": [
                {
                  "type": "media",
                  "attrs": {
                    "type": "file",
                    "id": "abc 123 def 456",
                    "collection": "my-collection",
                    "width": 800,
                    "height": 600
                  }
                }
              ]
            }
          ]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(r#"id="abc 123 def 456""#),
            "id with spaces should be quoted in JFM, got:\n{md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let expected: serde_json::Value = serde_json::from_str(adf_json).unwrap();
        let actual = serde_json::to_value(&rt).unwrap();
        assert_eq!(
            actual, expected,
            "space-containing id must round-trip; md was:\n{md}"
        );
    }

    /// Space-containing `collection` values must round-trip.
    #[test]
    fn file_media_roundtrip_collection_with_spaces() {
        let adf_json = r#"{
          "version": 1,
          "type": "doc",
          "content": [
            {
              "type": "mediaSingle",
              "attrs": {"layout": "center"},
              "content": [
                {
                  "type": "media",
                  "attrs": {
                    "type": "file",
                    "id": "abc-123",
                    "collection": "my collection with spaces"
                  }
                }
              ]
            }
          ]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let media = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(
            media.attrs.as_ref().unwrap()["collection"],
            "my collection with spaces"
        );
    }

    /// Space-containing `occurrenceKey` values must round-trip.
    #[test]
    fn file_media_roundtrip_occurrence_key_with_spaces() {
        let adf_json = r#"{
          "version": 1,
          "type": "doc",
          "content": [
            {
              "type": "mediaSingle",
              "attrs": {"layout": "center"},
              "content": [
                {
                  "type": "media",
                  "attrs": {
                    "type": "file",
                    "id": "x",
                    "collection": "y",
                    "occurrenceKey": "key with spaces"
                  }
                }
              ]
            }
          ]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let media = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(
            media.attrs.as_ref().unwrap()["occurrenceKey"],
            "key with spaces"
        );
    }

    /// Values with embedded `"` must be escape-quoted and round-trip.
    #[test]
    fn file_media_roundtrip_id_with_quote_char() {
        let adf_json = r#"{
          "version": 1,
          "type": "doc",
          "content": [
            {
              "type": "mediaSingle",
              "attrs": {"layout": "center"},
              "content": [
                {
                  "type": "media",
                  "attrs": {
                    "type": "file",
                    "id": "a\"b\"c",
                    "collection": "col"
                  }
                }
              ]
            }
          ]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let media = &rt.content[0].content.as_ref().unwrap()[0];
        assert_eq!(media.attrs.as_ref().unwrap()["id"], "a\"b\"c");
    }

    /// `mediaInline` string attrs with spaces must round-trip (parallel fix
    /// for the inline-directive rendering path).
    #[test]
    fn media_inline_roundtrip_id_with_spaces() {
        let adf_json = r#"{
          "version": 1,
          "type": "doc",
          "content": [
            {
              "type": "paragraph",
              "content": [
                {"type": "text", "text": "before "},
                {
                  "type": "mediaInline",
                  "attrs": {
                    "type": "file",
                    "id": "a b c",
                    "collection": "my col"
                  }
                },
                {"type": "text", "text": " after"}
              ]
            }
          ]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let inline = &rt.content[0].content.as_ref().unwrap()[1];
        assert_eq!(inline.node_type, "mediaInline");
        let attrs = inline.attrs.as_ref().unwrap();
        assert_eq!(attrs["id"], "a b c");
        assert_eq!(attrs["collection"], "my col");
    }

    /// Issue #550: `occurrenceKey` attribute is a standard ADF media attr and
    /// must be preserved through ADF→JFM→ADF roundtrip.
    #[test]
    fn file_media_roundtrip_preserves_occurrence_key() {
        let adf_json = r#"{
          "version": 1,
          "type": "doc",
          "content": [
            {
              "type": "mediaSingle",
              "attrs": {"layout": "center"},
              "content": [
                {
                  "type": "media",
                  "attrs": {
                    "type": "file",
                    "id": "abc-123",
                    "collection": "my-collection",
                    "occurrenceKey": "unique-key-xyz",
                    "width": 200,
                    "height": 100
                  }
                }
              ]
            }
          ]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("occurrenceKey=unique-key-xyz"),
            "expected occurrenceKey in markdown, got: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let media = &rt.content[0].content.as_ref().unwrap()[0];
        let attrs = media.attrs.as_ref().unwrap();
        assert_eq!(attrs["occurrenceKey"], "unique-key-xyz");
        assert_eq!(attrs["type"], "file");
        assert_eq!(attrs["id"], "abc-123");
        assert_eq!(attrs["collection"], "my-collection");
    }

    // ── mediaSingle caption tests (issue #470) ──────────────────────────

    #[test]
    fn media_single_caption_adf_to_markdown() {
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center", "width": 400, "widthType": "pixel"},
                "content": [
                    {
                        "type": "media",
                        "attrs": {
                            "id": "aabbccdd-1234-5678-abcd-aabbccdd1234",
                            "type": "file",
                            "collection": "contentId-123456",
                            "width": 800,
                            "height": 600
                        }
                    },
                    {
                        "type": "caption",
                        "content": [{"type": "text", "text": "An image caption here"}]
                    }
                ]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(":::caption"),
            "expected :::caption in markdown, got: {md}"
        );
        assert!(
            md.contains("An image caption here"),
            "expected caption text in markdown, got: {md}"
        );
    }

    #[test]
    fn media_single_caption_markdown_to_adf() {
        let md = "![Screenshot](){type=file id=abc-123 collection=contentId-456 height=600 width=800}\n:::caption\nAn image caption here\n:::\n";
        let doc = markdown_to_adf(md).unwrap();
        let ms = &doc.content[0];
        assert_eq!(ms.node_type, "mediaSingle");
        let content = ms.content.as_ref().unwrap();
        assert_eq!(content.len(), 2, "expected media + caption children");
        assert_eq!(content[0].node_type, "media");
        assert_eq!(content[1].node_type, "caption");
        let caption_content = content[1].content.as_ref().unwrap();
        assert_eq!(
            caption_content[0].text.as_deref(),
            Some("An image caption here")
        );
    }

    #[test]
    fn media_single_caption_round_trip() {
        // Full round-trip: ADF → JFM → ADF preserves caption
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center", "width": 400, "widthType": "pixel"},
                "content": [
                    {
                        "type": "media",
                        "attrs": {
                            "id": "aabbccdd-1234-5678-abcd-aabbccdd1234",
                            "type": "file",
                            "collection": "contentId-123456",
                            "width": 800,
                            "height": 600
                        }
                    },
                    {
                        "type": "caption",
                        "content": [{"type": "text", "text": "An image caption here"}]
                    }
                ]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let doc2 = markdown_to_adf(&md).unwrap();
        let ms = &doc2.content[0];
        assert_eq!(ms.node_type, "mediaSingle");
        let content = ms.content.as_ref().unwrap();
        assert_eq!(
            content.len(),
            2,
            "expected media + caption after round-trip"
        );
        assert_eq!(content[1].node_type, "caption");
        let caption_content = content[1].content.as_ref().unwrap();
        assert_eq!(
            caption_content[0].text.as_deref(),
            Some("An image caption here")
        );
    }

    #[test]
    fn media_single_caption_with_inline_marks() {
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center"},
                "content": [
                    {
                        "type": "media",
                        "attrs": {"type": "external", "url": "https://example.com/img.png"}
                    },
                    {
                        "type": "caption",
                        "content": [
                            {"type": "text", "text": "A "},
                            {"type": "text", "text": "bold", "marks": [{"type": "strong"}]},
                            {"type": "text", "text": " caption"}
                        ]
                    }
                ]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("**bold**"),
            "expected bold in caption, got: {md}"
        );

        let doc2 = markdown_to_adf(&md).unwrap();
        let content = doc2.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 2, "expected media + caption");
        assert_eq!(content[1].node_type, "caption");
        let caption_inlines = content[1].content.as_ref().unwrap();
        let bold_node = caption_inlines
            .iter()
            .find(|n| n.text.as_deref() == Some("bold"))
            .unwrap();
        let marks = bold_node.marks.as_ref().unwrap();
        assert_eq!(marks[0].mark_type, "strong");
    }

    #[test]
    fn media_single_no_caption_unaffected() {
        // Existing mediaSingle without caption should be unaffected
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center"},
                "content": [{
                    "type": "media",
                    "attrs": {"type": "external", "url": "https://example.com/img.png"}
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            !md.contains(":::caption"),
            "should not emit caption when none present"
        );
        let doc2 = markdown_to_adf(&md).unwrap();
        let content = doc2.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1, "should only have media child");
        assert_eq!(content[0].node_type, "media");
    }

    #[test]
    fn media_single_empty_caption_round_trip() {
        // Caption node with no content should still round-trip
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center"},
                "content": [
                    {
                        "type": "media",
                        "attrs": {"type": "external", "url": "https://example.com/img.png"}
                    },
                    {
                        "type": "caption"
                    }
                ]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(":::caption"),
            "expected :::caption even for empty caption, got: {md}"
        );
        assert!(
            md.contains(":::\n"),
            "expected closing ::: fence, got: {md}"
        );
    }

    #[test]
    fn media_single_external_caption_round_trip() {
        // External image with caption round-trips
        let md = "![alt](https://example.com/img.png)\n:::caption\nImage description\n:::\n";
        let doc = markdown_to_adf(md).unwrap();
        let ms = &doc.content[0];
        assert_eq!(ms.node_type, "mediaSingle");
        let content = ms.content.as_ref().unwrap();
        assert_eq!(content.len(), 2);
        assert_eq!(content[0].node_type, "media");
        assert_eq!(content[1].node_type, "caption");

        let md2 = adf_to_markdown(&doc).unwrap();
        let doc2 = markdown_to_adf(&md2).unwrap();
        let content2 = doc2.content[0].content.as_ref().unwrap();
        assert_eq!(content2.len(), 2);
        assert_eq!(content2[1].node_type, "caption");
        let caption_text = content2[1].content.as_ref().unwrap();
        assert_eq!(caption_text[0].text.as_deref(), Some("Image description"));
    }

    // ── mediaSingle caption localId tests (issue #524) ─────────────────

    #[test]
    fn media_single_caption_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"mediaSingle","attrs":{"layout":"center"},"content":[{"type":"media","attrs":{"id":"aabbccdd-1234-5678-abcd-000000000001","type":"file","collection":"test-collection"}},{"type":"caption","attrs":{"localId":"9da8c2104471"},"content":[{"type":"text","text":"a caption with hex localId"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=9da8c2104471"),
            "caption localId should appear in markdown: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        let caption = &content[1];
        assert_eq!(caption.node_type, "caption");
        assert_eq!(
            caption.attrs.as_ref().unwrap()["localId"],
            "9da8c2104471",
            "caption localId should round-trip"
        );
    }

    #[test]
    fn media_single_caption_without_localid() {
        let md = "![Screenshot](){type=file id=abc-123 collection=contentId-456 height=600 width=800}\n:::caption\nPlain caption\n:::\n";
        let doc = markdown_to_adf(md).unwrap();
        let caption = &doc.content[0].content.as_ref().unwrap()[1];
        assert_eq!(caption.node_type, "caption");
        assert!(
            caption.attrs.is_none(),
            "caption without localId should not gain attrs"
        );
        let md2 = adf_to_markdown(&doc).unwrap();
        assert!(
            !md2.contains("localId"),
            "no localId should appear in output: {md2}"
        );
    }

    #[test]
    fn media_single_caption_localid_stripped_when_option_set() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"mediaSingle","attrs":{"layout":"center"},"content":[{"type":"media","attrs":{"id":"aabbccdd-1234-5678-abcd-000000000001","type":"file","collection":"test-collection"}},{"type":"caption","attrs":{"localId":"9da8c2104471"},"content":[{"type":"text","text":"stripped caption"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
            ..Default::default()
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(!md.contains("localId"), "localId should be stripped: {md}");
    }

    #[test]
    fn table_width_roundtrip() {
        // ADF table with width attribute
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "table",
                "attrs": {"layout": "default", "width": 760.0},
                "content": [{
                    "type": "tableRow",
                    "content": [{
                        "type": "tableHeader",
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "H"}]}]
                    }]
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("width=760.0"),
            "expected width=760.0 in markdown (float preserved), got: {md}"
        );
        // Round-trip back to ADF
        let doc2 = markdown_to_adf(&md).unwrap();
        let table = &doc2.content[0];
        assert_eq!(table.node_type, "table");
        let table_attrs = table.attrs.as_ref().unwrap();
        assert_eq!(table_attrs["width"], 760.0);
        assert!(
            table_attrs["width"].is_f64(),
            "expected float width to be preserved as f64, got: {:?}",
            table_attrs["width"]
        );
    }

    #[test]
    fn table_integer_width_roundtrip_preserves_integer() {
        // Issue #577: Integer width in ADF must survive roundtrip without being
        // coerced to a float.
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "table",
                "attrs": {
                    "isNumberColumnEnabled": false,
                    "layout": "center",
                    "localId": "abc-123",
                    "width": 1420
                },
                "content": [{
                    "type": "tableRow",
                    "content": [{
                        "type": "tableCell",
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "Cell"}]}]
                    }]
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument =
            serde_json::from_value(adf_doc.clone()).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("width=1420"),
            "expected width=1420 in markdown, got: {md}"
        );
        assert!(
            !md.contains("width=1420.0"),
            "integer width should not be rendered with decimal: {md}"
        );

        let doc2 = markdown_to_adf(&md).unwrap();
        let table = &doc2.content[0];
        assert_eq!(table.node_type, "table");
        let table_attrs = table.attrs.as_ref().unwrap();
        assert_eq!(table_attrs["width"], 1420);
        assert!(
            table_attrs["width"].is_u64() || table_attrs["width"].is_i64(),
            "width should remain an integer, got: {:?}",
            table_attrs["width"]
        );
        assert!(
            !table_attrs["width"].is_f64(),
            "width should not be a float, got: {:?}",
            table_attrs["width"]
        );

        // Full byte-fidelity: re-serialized ADF should match original JSON.
        let roundtripped = serde_json::to_value(&doc2).unwrap();
        let orig_width = &adf_doc["content"][0]["attrs"]["width"];
        let rt_width = &roundtripped["content"][0]["attrs"]["width"];
        assert_eq!(
            orig_width, rt_width,
            "width value must roundtrip byte-for-byte"
        );
    }

    #[test]
    fn table_fractional_width_roundtrip() {
        // Fractional float widths should also roundtrip faithfully.
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "table",
                "attrs": {"layout": "default", "width": 760.5},
                "content": [{
                    "type": "tableRow",
                    "content": [{
                        "type": "tableHeader",
                        "content": [{"type": "paragraph", "content": [{"type": "text", "text": "H"}]}]
                    }]
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("width=760.5"),
            "expected width=760.5 in markdown, got: {md}"
        );
        let doc2 = markdown_to_adf(&md).unwrap();
        let table_attrs = doc2.content[0].attrs.as_ref().unwrap();
        assert_eq!(table_attrs["width"], 760.5);
        assert!(table_attrs["width"].is_f64());
    }

    #[test]
    fn pipe_table_integer_width_roundtrip() {
        // Exercises the try_table() attrs-on-next-line parsing path.
        let md = "| A | B |\n|---|---|\n| 1 | 2 |\n{layout=default width=1420}\n";
        let doc = markdown_to_adf(md).unwrap();
        let table = &doc.content[0];
        assert_eq!(table.node_type, "table");
        let attrs = table.attrs.as_ref().unwrap();
        assert_eq!(attrs["width"], 1420);
        assert!(
            attrs["width"].is_u64() || attrs["width"].is_i64(),
            "pipe-table width must stay integer, got: {:?}",
            attrs["width"]
        );
    }

    #[test]
    fn file_media_width_type_roundtrip() {
        // mediaSingle with widthType:pixel should survive round-trip
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center", "width": 312, "widthType": "pixel"},
                "content": [{
                    "type": "media",
                    "attrs": {
                        "type": "file",
                        "id": "abc123",
                        "collection": "contentId-999",
                        "height": 56,
                        "width": 312
                    }
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("widthType=pixel"),
            "expected widthType=pixel in markdown, got: {md}"
        );
        let doc2 = markdown_to_adf(&md).unwrap();
        let ms = &doc2.content[0];
        let ms_attrs = ms.attrs.as_ref().unwrap();
        assert_eq!(ms_attrs["widthType"], "pixel");
        assert_eq!(ms_attrs["width"], 312);
    }

    #[test]
    fn file_media_pixel_width_above_100_passes_validation() {
        // Issue #1037: confluence_read emits pixel widths well above 100 for
        // editor-sized images (here width=900). Lowering carries width=900
        // widthType=pixel onto the mediaSingle, which is valid ADF — the
        // upstream schema's pixel branch is unbounded. A read→write round-trip
        // must clear the write-path validator, not be rejected as out of range
        // (the original failure: "value 900 is outside the allowed range
        // [0, 100]"). Unlike `file_media_width_type_roundtrip`, this asserts on
        // the validator, which the conversion-only round-trip never exercises.
        let md = "![alt](){type=file id=11111111-2222-3333-4444-555555555555 collection=contentId-98765 height=904 width=900 mediaWidth=900 widthType=pixel}\n";
        let adf = markdown_to_adf(md).unwrap();

        let ms_attrs = adf.content[0].attrs.as_ref().unwrap();
        assert_eq!(ms_attrs["width"], 900);
        assert_eq!(ms_attrs["widthType"], "pixel");

        crate::atlassian::adf_validated::validate(&adf).unwrap();
    }

    #[test]
    fn file_media_mode_roundtrip() {
        // mediaSingle with mode attr should survive round-trip (issue #431)
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "wide", "mode": "wide", "width": 1200},
                "content": [{
                    "type": "media",
                    "attrs": {
                        "type": "file",
                        "id": "abc123",
                        "collection": "test",
                        "width": 1200,
                        "height": 600
                    }
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("mode=wide"),
            "expected mode=wide in markdown, got: {md}"
        );
        let doc2 = markdown_to_adf(&md).unwrap();
        let ms = &doc2.content[0];
        let ms_attrs = ms.attrs.as_ref().unwrap();
        assert_eq!(ms_attrs["mode"], "wide");
        assert_eq!(ms_attrs["layout"], "wide");
        assert_eq!(ms_attrs["width"], 1200);
    }

    #[test]
    fn external_media_mode_roundtrip() {
        // External mediaSingle with mode attr should survive round-trip (issue #431)
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "wide", "mode": "wide"},
                "content": [{
                    "type": "media",
                    "attrs": {
                        "type": "external",
                        "url": "https://example.com/image.png"
                    }
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("mode=wide"),
            "expected mode=wide in markdown, got: {md}"
        );
        let doc2 = markdown_to_adf(&md).unwrap();
        let ms = &doc2.content[0];
        let ms_attrs = ms.attrs.as_ref().unwrap();
        assert_eq!(ms_attrs["mode"], "wide");
        assert_eq!(ms_attrs["layout"], "wide");
    }

    #[test]
    fn media_mode_only_roundtrip() {
        // mediaSingle with mode but default layout should still preserve mode (issue #431)
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center", "mode": "default"},
                "content": [{
                    "type": "media",
                    "attrs": {
                        "type": "external",
                        "url": "https://example.com/image.png"
                    }
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("mode=default"),
            "expected mode=default in markdown, got: {md}"
        );
        let doc2 = markdown_to_adf(&md).unwrap();
        let ms = &doc2.content[0];
        let ms_attrs = ms.attrs.as_ref().unwrap();
        assert_eq!(ms_attrs["mode"], "default");
    }

    #[test]
    fn file_media_hex_localid_roundtrip() {
        // Issue #432: short hex localId (non-UUID) must survive round-trip
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "wide", "width": 1200, "widthType": "pixel"},
                "content": [{
                    "type": "media",
                    "attrs": {
                        "type": "file",
                        "id": "eb7a9c3b-314e-4458-8200-4b22b67b122e",
                        "collection": "contentId-123",
                        "height": 484,
                        "width": 915,
                        "alt": "image.png",
                        "localId": "0e79f58ac382"
                    }
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=0e79f58ac382"),
            "expected localId=0e79f58ac382 in markdown, got: {md}"
        );
        let doc2 = markdown_to_adf(&md).unwrap();
        let ms = &doc2.content[0];
        let media = &ms.content.as_ref().unwrap()[0];
        let attrs = media.attrs.as_ref().unwrap();
        assert_eq!(attrs["localId"], "0e79f58ac382");
    }

    #[test]
    fn file_media_uuid_localid_roundtrip() {
        // UUID-format localId must also survive round-trip
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center"},
                "content": [{
                    "type": "media",
                    "attrs": {
                        "type": "file",
                        "id": "abc-123",
                        "collection": "contentId-456",
                        "height": 100,
                        "width": 200,
                        "localId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890"
                    }
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=a1b2c3d4-e5f6-7890-abcd-ef1234567890"),
            "expected UUID localId in markdown, got: {md}"
        );
        let doc2 = markdown_to_adf(&md).unwrap();
        let media = &doc2.content[0].content.as_ref().unwrap()[0];
        let attrs = media.attrs.as_ref().unwrap();
        assert_eq!(attrs["localId"], "a1b2c3d4-e5f6-7890-abcd-ef1234567890");
    }

    #[test]
    fn file_media_null_uuid_localid_stripped() {
        // Null UUID localId should be stripped (consistent with other node types)
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center"},
                "content": [{
                    "type": "media",
                    "attrs": {
                        "type": "file",
                        "id": "abc-123",
                        "collection": "contentId-456",
                        "height": 100,
                        "width": 200,
                        "localId": "00000000-0000-0000-0000-000000000000"
                    }
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            !md.contains("localId="),
            "null UUID localId should be stripped, got: {md}"
        );
    }

    #[test]
    fn file_media_localid_stripped_when_option_set() {
        // localId should be stripped when strip_local_ids option is enabled
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center"},
                "content": [{
                    "type": "media",
                    "attrs": {
                        "type": "file",
                        "id": "abc-123",
                        "collection": "contentId-456",
                        "height": 100,
                        "width": 200,
                        "localId": "0e79f58ac382"
                    }
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
            ..Default::default()
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(
            !md.contains("localId="),
            "localId should be stripped with strip_local_ids, got: {md}"
        );
    }

    #[test]
    fn external_media_localid_roundtrip() {
        // localId on external media nodes must also survive round-trip
        let adf_doc = serde_json::json!({
            "type": "doc",
            "version": 1,
            "content": [{
                "type": "mediaSingle",
                "attrs": {"layout": "center"},
                "content": [{
                    "type": "media",
                    "attrs": {
                        "type": "external",
                        "url": "https://example.com/image.png",
                        "alt": "test",
                        "localId": "deadbeef1234"
                    }
                }]
            }]
        });
        let doc: crate::atlassian::adf::AdfDocument = serde_json::from_value(adf_doc).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=deadbeef1234"),
            "expected localId in markdown for external media, got: {md}"
        );
        let doc2 = markdown_to_adf(&md).unwrap();
        let media = &doc2.content[0].content.as_ref().unwrap()[0];
        let attrs = media.attrs.as_ref().unwrap();
        assert_eq!(attrs["localId"], "deadbeef1234");
    }

    #[test]
    fn bracket_in_text_not_parsed_as_link() {
        // "[Task] some text (Link)" — the [Task] must NOT be treated as a link anchor
        let md = ":check_mark: [Task] Unable to start trial ([Link](https://example.com/link))";
        let doc = markdown_to_adf(md).unwrap();
        let para = &doc.content[0];
        assert_eq!(para.node_type, "paragraph");
        let content = para.content.as_ref().unwrap();
        // Find the text node containing "[Task]"
        let text_nodes: Vec<_> = content.iter().filter(|n| n.node_type == "text").collect();
        let has_task_bracket = text_nodes
            .iter()
            .any(|n| n.text.as_deref().unwrap_or("").contains("[Task]"));
        assert!(
            has_task_bracket,
            "expected [Task] in plain text, nodes: {content:?}"
        );
        // Also verify the (Link) is a proper link
        let link_nodes: Vec<_> = content
            .iter()
            .filter(|n| {
                n.marks
                    .as_ref()
                    .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "link"))
            })
            .collect();
        assert!(!link_nodes.is_empty(), "expected a link node");
        assert_eq!(
            link_nodes[0].text.as_deref(),
            Some("Link"),
            "link text should be 'Link'"
        );
    }

    #[test]
    fn empty_paragraph_roundtrip() {
        // An empty ADF paragraph node should survive a round-trip through markdown
        let mut adf_in = AdfDocument::new();
        adf_in.content = vec![
            AdfNode::paragraph(vec![AdfNode::text("before")]),
            AdfNode::paragraph(vec![]),
            AdfNode::paragraph(vec![AdfNode::text("after")]),
        ];
        let md = adf_to_markdown(&adf_in).unwrap();
        let adf_out = markdown_to_adf(&md).unwrap();
        assert_eq!(
            adf_out.content.len(),
            3,
            "should have 3 blocks, markdown:\n{md}"
        );
        assert_eq!(adf_out.content[0].node_type, "paragraph");
        assert_eq!(adf_out.content[1].node_type, "paragraph");
        assert!(
            adf_out.content[1].content.is_none(),
            "middle paragraph should be empty"
        );
        assert_eq!(adf_out.content[2].node_type, "paragraph");
    }

    #[test]
    fn nbsp_paragraph_roundtrip() {
        // Issue #411: paragraph with only NBSP should survive round-trip
        let adf_json = "{\"version\":1,\"type\":\"doc\",\"content\":[{\"type\":\"paragraph\",\"content\":[{\"type\":\"text\",\"text\":\"\\u00a0\"}]}]}";
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("::paragraph["),
            "NBSP paragraph should use directive form: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(rt.content.len(), 1, "should have 1 block");
        assert_eq!(rt.content[0].node_type, "paragraph");
        let text = rt.content[0].content.as_ref().unwrap()[0]
            .text
            .as_deref()
            .unwrap_or("");
        assert_eq!(text, "\u{00a0}", "NBSP should survive round-trip");
    }

    #[test]
    fn nbsp_in_nested_expand_roundtrip() {
        // Issue #411 real-world case: NBSP paragraph inside nestedExpand
        let adf_json = "{\"version\":1,\"type\":\"doc\",\"content\":[{\"type\":\"nestedExpand\",\"attrs\":{\"title\":\"Section\"},\"content\":[{\"type\":\"paragraph\",\"content\":[{\"type\":\"text\",\"text\":\"\\u00a0\"}]}]}]}";
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let ne = &rt.content[0];
        assert_eq!(ne.node_type, "nestedExpand");
        let inner = ne.content.as_ref().unwrap();
        assert_eq!(inner.len(), 1, "should have 1 inner block");
        assert_eq!(inner[0].node_type, "paragraph");
        let content = inner[0].content.as_ref().unwrap();
        assert!(!content.is_empty(), "paragraph should not be empty");
        let text = content[0].text.as_deref().unwrap_or("");
        assert_eq!(text, "\u{00a0}", "NBSP should survive in nestedExpand");
    }

    #[test]
    fn nbsp_followed_by_content() {
        // NBSP paragraph followed by regular content should not interfere
        let adf_json = "{\"version\":1,\"type\":\"doc\",\"content\":[{\"type\":\"nestedExpand\",\"attrs\":{\"title\":\"S\"},\"content\":[{\"type\":\"paragraph\",\"content\":[{\"type\":\"text\",\"text\":\"\\u00a0\"}]}]},{\"type\":\"paragraph\",\"content\":[{\"type\":\"text\",\"text\":\"after\"}]}]}";
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        assert!(rt.content.len() >= 2, "should have at least 2 blocks");
        // The second block should be a paragraph with "after"
        let after_para = rt.content.iter().find(|n| {
            n.node_type == "paragraph"
                && n.content
                    .as_ref()
                    .and_then(|c| c.first())
                    .and_then(|n| n.text.as_deref())
                    .is_some_and(|t| t.contains("after"))
        });
        assert!(after_para.is_some(), "should have paragraph with 'after'");
    }

    #[test]
    fn nbsp_paragraph_with_marks_survives() {
        // NBSP with bold marks renders as `** **` which contains non-whitespace
        // chars and thus doesn't need the directive form — it round-trips naturally
        let adf_json = "{\"version\":1,\"type\":\"doc\",\"content\":[{\"type\":\"paragraph\",\"content\":[{\"type\":\"text\",\"text\":\"\\u00a0\",\"marks\":[{\"type\":\"strong\"}]}]}]}";
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("**"), "should have bold markers: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert!(!content.is_empty(), "should preserve content");
    }

    #[test]
    fn regular_paragraph_unchanged() {
        // Regression guard: normal paragraphs should NOT use directive form
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"hello"}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            !md.contains("::paragraph"),
            "regular paragraphs should not use directive form: {md}"
        );
        assert!(md.contains("hello"));
    }

    #[test]
    fn paragraph_directive_with_content_parsed() {
        // ::paragraph[content] should parse to a paragraph with inline nodes
        let md = "::paragraph[\u{00a0}]\n";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(doc.content.len(), 1);
        assert_eq!(doc.content[0].node_type, "paragraph");
        let content = doc.content[0].content.as_ref().unwrap();
        assert!(!content.is_empty(), "should have inline content");
        assert_eq!(content[0].text.as_deref().unwrap(), "\u{00a0}");
    }

    #[test]
    fn nbsp_paragraph_in_list_item_with_nested_list() {
        // Issue #448: NBSP paragraph content lost inside listItem with nested bulletList
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"\u00a0"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"sub item one"}]}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let list = &rt.content[0];
        assert_eq!(list.node_type, "bulletList");
        let item = &list.content.as_ref().unwrap()[0];
        let item_content = item.content.as_ref().unwrap();
        assert_eq!(
            item_content.len(),
            2,
            "listItem should have paragraph + nested list, got: {item_content:?}"
        );
        let para = &item_content[0];
        assert_eq!(para.node_type, "paragraph");
        let para_content = para
            .content
            .as_ref()
            .expect("paragraph should have content");
        assert!(
            !para_content.is_empty(),
            "NBSP paragraph content should not be empty"
        );
        assert_eq!(
            para_content[0].text.as_deref().unwrap(),
            "\u{00a0}",
            "NBSP should survive round-trip inside listItem"
        );
    }

    #[test]
    fn nbsp_paragraph_in_list_item_with_local_ids() {
        // Issue #448: NBSP paragraph with localIds inside listItem with nested list
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","attrs":{"localId":"li-001"},"content":[{"type":"paragraph","attrs":{"localId":"p-001"},"content":[{"type":"text","text":"\u00a0"}]},{"type":"bulletList","content":[{"type":"listItem","attrs":{"localId":"li-002"},"content":[{"type":"paragraph","attrs":{"localId":"p-002"},"content":[{"type":"text","text":"sub item"}]}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let list = &rt.content[0];
        let item = &list.content.as_ref().unwrap()[0];
        // Check listItem localId
        assert_eq!(
            item.attrs.as_ref().unwrap()["localId"],
            "li-001",
            "listItem localId should survive"
        );
        let item_content = item.content.as_ref().unwrap();
        assert_eq!(item_content.len(), 2);
        // Check paragraph localId and NBSP content
        let para = &item_content[0];
        assert_eq!(
            para.attrs.as_ref().unwrap()["localId"],
            "p-001",
            "paragraph localId should survive"
        );
        let text = para.content.as_ref().unwrap()[0].text.as_deref().unwrap();
        assert_eq!(text, "\u{00a0}", "NBSP should survive with localIds");
    }

    #[test]
    fn nbsp_paragraph_in_list_item_without_nested_list() {
        // NBSP paragraph in a simple listItem (no nested list)
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","attrs":{"localId":"li-001"},"content":[{"type":"paragraph","attrs":{"localId":"p-001"},"content":[{"type":"text","text":"\u00a0"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let list = &rt.content[0];
        let item = &list.content.as_ref().unwrap()[0];
        let para = &item.content.as_ref().unwrap()[0];
        let text = para.content.as_ref().unwrap()[0].text.as_deref().unwrap();
        assert_eq!(text, "\u{00a0}", "NBSP should survive in simple list item");
    }

    #[test]
    fn nbsp_paragraph_in_ordered_list_item_with_nested_list() {
        // NBSP paragraph in ordered listItem with nested bulletList
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","attrs":{"localId":"li-001"},"content":[{"type":"paragraph","attrs":{"localId":"p-001"},"content":[{"type":"text","text":"\u00a0"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"sub item"}]}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let list = &rt.content[0];
        let item = &list.content.as_ref().unwrap()[0];
        let item_content = item.content.as_ref().unwrap();
        assert_eq!(item_content.len(), 2);
        let para = &item_content[0];
        let text = para.content.as_ref().unwrap()[0].text.as_deref().unwrap();
        assert_eq!(text, "\u{00a0}", "NBSP should survive in ordered list item");
    }

    #[test]
    fn list_item_leading_space_preserved() {
        // Leading space in list item text must not be stripped
        let md = "- hello world\n- - text";
        let doc = markdown_to_adf(md).unwrap();
        let list = &doc.content[0];
        assert_eq!(list.node_type, "bulletList");
        let items = list.content.as_ref().unwrap();
        // First item: "hello world" (no leading space, unchanged)
        let first_para = &items[0].content.as_ref().unwrap()[0];
        let first_text = &first_para.content.as_ref().unwrap()[0];
        assert_eq!(first_text.text.as_deref(), Some("hello world"));
    }

    #[test]
    fn list_item_leading_space_not_stripped() {
        // When the markdown list item content has a leading space (e.g. " :emoji:"),
        // that space must reach parse_inline as-is.
        let md = "-  leading space text";
        let doc = markdown_to_adf(md).unwrap();
        let list = &doc.content[0];
        let items = list.content.as_ref().unwrap();
        let para = &items[0].content.as_ref().unwrap()[0];
        let text_node = &para.content.as_ref().unwrap()[0];
        // After "- " (2 chars), trim_end keeps the leading space: " leading space text"
        assert_eq!(
            text_node.text.as_deref(),
            Some(" leading space text"),
            "leading space should be preserved"
        );
    }

    // ── Nested container directive tests ───────────────────────────

    // ── hardBreak in table cell tests ────────────────────────────

    #[test]
    fn hardbreak_in_cell_uses_directive_table() {
        // A table cell with a hardBreak should NOT use pipe syntax
        // because the newline would break the row
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![AdfNode::table_row(vec![
                AdfNode::table_cell(vec![AdfNode::paragraph(vec![
                    AdfNode::text("before"),
                    AdfNode::hard_break(),
                    AdfNode::text("after"),
                ])]),
            ])])],
        };
        let md = adf_to_markdown(&adf).unwrap();
        // Should render as directive table, not pipe table
        assert!(
            md.contains(":::td") || md.contains("::::table"),
            "Table with hardBreak should use directive form, got:\n{md}"
        );
        assert!(
            !md.contains("| before"),
            "Should NOT use pipe syntax with hardBreak"
        );
    }

    #[test]
    fn hardbreak_in_cell_roundtrips() {
        // Verify the directive table form preserves the hardBreak on round-trip
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![AdfNode::table_row(vec![
                AdfNode::table_cell(vec![AdfNode::paragraph(vec![
                    AdfNode::text("line one"),
                    AdfNode::hard_break(),
                    AdfNode::text("line two"),
                ])]),
            ])])],
        };
        let md = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();

        // Should still have one table with one row with one cell
        assert_eq!(roundtripped.content.len(), 1);
        assert_eq!(roundtripped.content[0].node_type, "table");
        let rows = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            rows.len(),
            1,
            "Should have exactly 1 row, got {}",
            rows.len()
        );
    }

    #[test]
    fn hardbreak_in_paragraph_roundtrips() {
        // Issue #373: hardBreak absorbed into preceding text node
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"line one"},
          {"type":"hardBreak"},
          {"type":"text","text":"line two"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let inlines = round_tripped.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "text"],
            "hardBreak should be preserved, got: {types:?}"
        );
        assert_eq!(inlines[0].text.as_deref(), Some("line one"));
        assert_eq!(inlines[2].text.as_deref(), Some("line two"));
    }

    #[test]
    fn consecutive_hardbreaks_in_paragraph_roundtrip() {
        // Issue #410: consecutive hardBreak nodes collapsed on round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"before"},
          {"type":"hardBreak"},
          {"type":"hardBreak"},
          {"type":"text","text":"after"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        assert_eq!(
            round_tripped.content.len(),
            1,
            "Should remain a single paragraph, got {} blocks",
            round_tripped.content.len()
        );
        let inlines = round_tripped.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "hardBreak", "text"],
            "Both hardBreaks should be preserved, got: {types:?}"
        );
        assert_eq!(inlines[0].text.as_deref(), Some("before"));
        assert_eq!(inlines[3].text.as_deref(), Some("after"));
    }

    #[test]
    fn hardbreak_only_paragraph_roundtrips() {
        // Issue #410: paragraph whose only content is a hardBreak is dropped
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"paragraph","content":[{"type":"hardBreak"}]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        assert_eq!(
            round_tripped.content.len(),
            1,
            "Paragraph should not be dropped, got {} blocks",
            round_tripped.content.len()
        );
        let inlines = round_tripped.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["hardBreak"],
            "hardBreak-only paragraph should preserve its content, got: {types:?}"
        );
    }

    #[test]
    fn issue_410_full_reproducer_roundtrips() {
        // Full reproducer from issue #410: consecutive hardBreaks + hardBreak-only paragraph
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"paragraph","content":[
            {"type":"text","text":"before"},
            {"type":"hardBreak"},
            {"type":"hardBreak"},
            {"type":"text","text":"after"}
          ]},
          {"type":"paragraph","content":[
            {"type":"hardBreak"}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        assert_eq!(
            round_tripped.content.len(),
            2,
            "Should have exactly 2 paragraphs, got {}",
            round_tripped.content.len()
        );
        // First paragraph: text, hardBreak, hardBreak, text
        let p1 = round_tripped.content[0].content.as_ref().unwrap();
        let types1: Vec<&str> = p1.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types1, vec!["text", "hardBreak", "hardBreak", "text"]);
        // Second paragraph: hardBreak only
        let p2 = round_tripped.content[1].content.as_ref().unwrap();
        let types2: Vec<&str> = p2.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types2, vec!["hardBreak"]);
    }

    #[test]
    fn trailing_space_hardbreak_still_parsed() {
        // Backward compatibility: trailing-space hardBreak (old JFM format) still parses
        let md = "line one  \nline two\n";
        let doc = markdown_to_adf(md).unwrap();
        let inlines = doc.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "text"],
            "Trailing-space hardBreak should still parse, got: {types:?}"
        );
    }

    #[test]
    fn trailing_hardbreak_at_end_of_paragraph_roundtrips() {
        // A paragraph ending with a hardBreak (no text after it)
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"text"},
          {"type":"hardBreak"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let inlines = round_tripped.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak"],
            "Trailing hardBreak should be preserved, got: {types:?}"
        );
    }

    #[test]
    #[test]
    fn table_with_header_row_uses_pipe_syntax() {
        // A table with tableHeader in the first row should use pipe syntax
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![AdfNode::table_row(vec![
                AdfNode::table_header(vec![AdfNode::paragraph(vec![AdfNode::text("header cell")])]),
            ])])],
        };
        let md = adf_to_markdown(&adf).unwrap();
        assert!(
            md.contains("| header cell |"),
            "Table with header row should use pipe syntax, got:\n{md}"
        );
    }

    #[test]
    fn table_without_header_row_uses_directive_syntax() {
        // Issue #392: tableCell-only first row must use directive syntax
        // to avoid converting tableCell → tableHeader on round-trip
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![AdfNode::table_row(vec![
                AdfNode::table_cell(vec![AdfNode::paragraph(vec![AdfNode::text("simple cell")])]),
            ])])],
        };
        let md = adf_to_markdown(&adf).unwrap();
        assert!(
            md.contains("::::table"),
            "Table without header row should use directive syntax, got:\n{md}"
        );
    }

    #[test]
    fn tablecell_first_row_preserved_on_roundtrip() {
        // Issue #392: tableCell in first row round-trips as tableHeader
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{},"content":[
          {"type":"tableRow","content":[
            {"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"row1 cell"}]}]}
          ]},
          {"type":"tableRow","content":[
            {"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"row2 cell"}]}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let rows = round_tripped.content[0].content.as_ref().unwrap();
        let row0_cell = &rows[0].content.as_ref().unwrap()[0];
        assert_eq!(
            row0_cell.node_type, "tableCell",
            "first row cell should remain tableCell, got: {}",
            row0_cell.node_type
        );
        let row1_cell = &rows[1].content.as_ref().unwrap()[0];
        assert_eq!(row1_cell.node_type, "tableCell");
    }

    #[test]
    fn mixed_header_and_cell_first_row_uses_pipe() {
        // A first row with at least one tableHeader qualifies for pipe syntax
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![
                AdfNode::table_row(vec![
                    AdfNode::table_header(vec![AdfNode::paragraph(vec![AdfNode::text("H1")])]),
                    AdfNode::table_header(vec![AdfNode::paragraph(vec![AdfNode::text("H2")])]),
                ]),
                AdfNode::table_row(vec![
                    AdfNode::table_cell(vec![AdfNode::paragraph(vec![AdfNode::text("C1")])]),
                    AdfNode::table_cell(vec![AdfNode::paragraph(vec![AdfNode::text("C2")])]),
                ]),
            ])],
        };
        let md = adf_to_markdown(&adf).unwrap();
        assert!(
            md.contains("| H1 |"),
            "Table with header first row should use pipe syntax, got:\n{md}"
        );
        assert!(!md.contains("::::table"), "should not use directive syntax");
    }

    // ── Issue #579: pipes in pipe-table cells ─────────────────────

    #[test]
    fn render_pipe_table_escapes_pipe_in_code_span_cell() {
        // A code-marked text node with a literal `|` in a pipe-table cell
        // must emit `\|` so the column separator is unambiguous.
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![
                AdfNode::table_row(vec![AdfNode::table_header(vec![AdfNode::paragraph(vec![
                    AdfNode::text("Header"),
                ])])]),
                AdfNode::table_row(vec![AdfNode::table_cell(vec![AdfNode::paragraph(vec![
                    AdfNode::text_with_marks("a|b", vec![AdfMark::code()]),
                ])])]),
            ])],
        };
        let md = adf_to_markdown(&adf).unwrap();
        assert!(
            md.contains(r"`a\|b`"),
            "Pipe inside code span must be escaped, got:\n{md}"
        );
    }

    #[test]
    fn render_pipe_table_escapes_pipe_in_plain_text_cell() {
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![
                AdfNode::table_row(vec![AdfNode::table_header(vec![AdfNode::paragraph(vec![
                    AdfNode::text("Header"),
                ])])]),
                AdfNode::table_row(vec![AdfNode::table_cell(vec![AdfNode::paragraph(vec![
                    AdfNode::text("x|y"),
                ])])]),
            ])],
        };
        let md = adf_to_markdown(&adf).unwrap();
        assert!(
            md.contains(r"x\|y"),
            "Pipe inside plain-text cell must be escaped, got:\n{md}"
        );
    }

    #[test]
    fn code_span_with_pipe_in_table_cell_roundtrips() {
        // Issue #579 reproducer: code span containing `|` in a pipe-table cell.
        let adf_json = r#"{
            "version": 1,
            "type": "doc",
            "content": [{
                "type": "table",
                "attrs": {"isNumberColumnEnabled": false, "layout": "default", "localId": "abc-789"},
                "content": [
                    {"type": "tableRow", "content": [
                        {"type": "tableHeader", "attrs": {}, "content": [
                            {"type": "paragraph", "content": [{"type": "text", "text": "Before"}]}
                        ]},
                        {"type": "tableHeader", "attrs": {}, "content": [
                            {"type": "paragraph", "content": [{"type": "text", "text": "After"}]}
                        ]}
                    ]},
                    {"type": "tableRow", "content": [
                        {"type": "tableCell", "attrs": {}, "content": [
                            {"type": "paragraph", "content": [
                                {"type": "text", "text": "parse(json).extract[T]", "marks": [{"type": "code"}]}
                            ]}
                        ]},
                        {"type": "tableCell", "attrs": {}, "content": [
                            {"type": "paragraph", "content": [
                                {"type": "text", "text": "parser.decode[T|json]", "marks": [{"type": "code"}]}
                            ]}
                        ]}
                    ]}
                ]
            }]
        }"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();

        let rows = round_tripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            rows.len(),
            2,
            "Table should have 2 rows, got: {}",
            rows.len()
        );

        let body_row = rows[1].content.as_ref().unwrap();
        assert_eq!(
            body_row.len(),
            2,
            "Body row should have 2 cells (not split by the pipe), got: {}",
            body_row.len()
        );

        let second_cell = &body_row[1];
        let para = second_cell.content.as_ref().unwrap().first().unwrap();
        let inlines = para.content.as_ref().unwrap();
        assert_eq!(inlines.len(), 1, "Cell should have a single text node");
        assert_eq!(
            inlines[0].text.as_deref(),
            Some("parser.decode[T|json]"),
            "Code-span text must be preserved with literal pipe"
        );
        let marks = inlines[0]
            .marks
            .as_ref()
            .expect("code mark must be preserved");
        assert!(
            marks.iter().any(|m| m.mark_type == "code"),
            "text node should carry the code mark"
        );
    }

    #[test]
    fn plain_text_pipe_in_table_cell_roundtrips() {
        // Plain text with `|` in a pipe-table cell should also survive.
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![
                AdfNode::table_row(vec![
                    AdfNode::table_header(vec![AdfNode::paragraph(vec![AdfNode::text("H1")])]),
                    AdfNode::table_header(vec![AdfNode::paragraph(vec![AdfNode::text("H2")])]),
                ]),
                AdfNode::table_row(vec![
                    AdfNode::table_cell(vec![AdfNode::paragraph(vec![AdfNode::text("a|b")])]),
                    AdfNode::table_cell(vec![AdfNode::paragraph(vec![AdfNode::text("c")])]),
                ]),
            ])],
        };
        let md = adf_to_markdown(&adf).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let rows = round_tripped.content[0].content.as_ref().unwrap();
        let body_row = rows[1].content.as_ref().unwrap();
        assert_eq!(
            body_row.len(),
            2,
            "Body row should keep 2 cells, got: {}",
            body_row.len()
        );
        let first_cell_text = body_row[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0]
            .text
            .as_deref();
        assert_eq!(first_cell_text, Some("a|b"));
    }

    #[test]
    fn cell_contains_hard_break_true() {
        let para = AdfNode::paragraph(vec![
            AdfNode::text("a"),
            AdfNode::hard_break(),
            AdfNode::text("b"),
        ]);
        assert!(cell_contains_hard_break(&para));
    }

    #[test]
    fn cell_contains_hard_break_false() {
        let para = AdfNode::paragraph(vec![AdfNode::text("no break here")]);
        assert!(!cell_contains_hard_break(&para));
    }

    #[test]
    fn cell_contains_hard_break_empty() {
        let para = AdfNode::paragraph(vec![]);
        assert!(!cell_contains_hard_break(&para));
    }

    // ── Multi-paragraph container tests ──────────────────────────

    #[test]
    fn multi_paragraph_panel_roundtrips() {
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode {
                node_type: "panel".to_string(),
                attrs: Some(serde_json::json!({"panelType": "info"})),
                content: Some(vec![
                    AdfNode::paragraph(vec![AdfNode::text("First paragraph.")]),
                    AdfNode::paragraph(vec![AdfNode::text("Second paragraph.")]),
                ]),
                text: None,
                marks: None,
                local_id: None,
                parameters: None,
            }],
        };

        let md = adf_to_markdown(&adf).unwrap();
        // Should have blank line between paragraphs inside the panel
        assert!(
            md.contains("First paragraph.\n\nSecond paragraph."),
            "Panel should have blank line between paragraphs, got:\n{md}"
        );

        // Round-trip should preserve two separate paragraphs
        let roundtripped = markdown_to_adf(&md).unwrap();
        assert_eq!(roundtripped.content.len(), 1);
        assert_eq!(roundtripped.content[0].node_type, "panel");
        let panel_content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            panel_content.len(),
            2,
            "Panel should have 2 paragraphs after round-trip, got {}",
            panel_content.len()
        );
    }

    #[test]
    fn multi_paragraph_expand_roundtrips() {
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode {
                node_type: "expand".to_string(),
                attrs: Some(serde_json::json!({"title": "Details"})),
                content: Some(vec![
                    AdfNode::paragraph(vec![AdfNode::text("Para one.")]),
                    AdfNode::paragraph(vec![AdfNode::text("Para two.")]),
                ]),
                text: None,
                marks: None,
                local_id: None,
                parameters: None,
            }],
        };

        let md = adf_to_markdown(&adf).unwrap();
        let roundtripped = markdown_to_adf(&md).unwrap();
        let expand_content = roundtripped.content[0].content.as_ref().unwrap();
        assert_eq!(
            expand_content.len(),
            2,
            "Expand should have 2 paragraphs after round-trip, got {}",
            expand_content.len()
        );
    }

    #[test]
    fn consecutive_nested_expands_in_table_cell_roundtrip() {
        let cell_content = vec![
            AdfNode {
                node_type: "nestedExpand".to_string(),
                attrs: Some(serde_json::json!({"title": "First"})),
                content: Some(vec![AdfNode::paragraph(vec![AdfNode::text("item 1")])]),
                text: None,
                marks: None,
                local_id: None,
                parameters: None,
            },
            AdfNode {
                node_type: "nestedExpand".to_string(),
                attrs: Some(serde_json::json!({"title": "Second"})),
                content: Some(vec![AdfNode::paragraph(vec![AdfNode::text("item 2")])]),
                text: None,
                marks: None,
                local_id: None,
                parameters: None,
            },
        ];
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![AdfNode::table_row(vec![
                AdfNode::table_cell(cell_content),
            ])])],
        };

        let md = adf_to_markdown(&adf).unwrap();
        assert!(
            md.contains(":::\n\n:::nested-expand"),
            "Should have blank line between consecutive nested-expands in cell, got:\n{md}"
        );

        let rt = markdown_to_adf(&md).unwrap();
        let cell = &rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let cell_nodes = cell.content.as_ref().unwrap();
        let expand_count = cell_nodes
            .iter()
            .filter(|n| n.node_type == "nestedExpand")
            .count();
        assert_eq!(
            expand_count, 2,
            "Both nested-expands should survive round-trip, got {expand_count}"
        );
    }

    #[test]
    fn multi_paragraph_in_table_cell_roundtrip() {
        // Two paragraphs inside a directive table cell should survive round-trip
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![AdfNode::table_row(vec![
                AdfNode::table_cell(vec![
                    AdfNode::paragraph(vec![AdfNode::text("Para one.")]),
                    AdfNode::paragraph(vec![AdfNode::text("Para two.")]),
                ]),
            ])])],
        };

        let md = adf_to_markdown(&adf).unwrap();
        assert!(
            md.contains("Para one.\n\nPara two."),
            "Should have blank line between paragraphs in cell, got:\n{md}"
        );

        let rt = markdown_to_adf(&md).unwrap();
        let cell = &rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let para_count = cell
            .content
            .as_ref()
            .unwrap()
            .iter()
            .filter(|n| n.node_type == "paragraph")
            .count();
        assert_eq!(para_count, 2, "Both paragraphs should survive round-trip");
    }

    #[test]
    fn panel_inside_table_cell_roundtrip() {
        // A panel inside a directive table cell
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![AdfNode::table_row(vec![
                AdfNode::table_cell(vec![
                    AdfNode::paragraph(vec![AdfNode::text("Before panel.")]),
                    AdfNode {
                        node_type: "panel".to_string(),
                        attrs: Some(serde_json::json!({"panelType": "info"})),
                        content: Some(vec![AdfNode::paragraph(vec![AdfNode::text(
                            "Panel content",
                        )])]),
                        text: None,
                        marks: None,
                        local_id: None,
                        parameters: None,
                    },
                ]),
            ])])],
        };

        let md = adf_to_markdown(&adf).unwrap();
        assert!(
            md.contains(":::panel"),
            "Should contain panel directive, got:\n{md}"
        );

        let rt = markdown_to_adf(&md).unwrap();
        let cell = &rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let has_panel = cell
            .content
            .as_ref()
            .unwrap()
            .iter()
            .any(|n| n.node_type == "panel");
        assert!(has_panel, "Panel should survive round-trip in table cell");
    }

    #[test]
    fn three_consecutive_expands_in_table_cell() {
        let make_expand = |title: &str| AdfNode {
            node_type: "nestedExpand".to_string(),
            attrs: Some(serde_json::json!({"title": title})),
            content: Some(vec![AdfNode::paragraph(vec![AdfNode::text("content")])]),
            text: None,
            marks: None,
            local_id: None,
            parameters: None,
        };
        let adf = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![AdfNode::table_row(vec![
                AdfNode::table_cell(vec![
                    make_expand("First"),
                    make_expand("Second"),
                    make_expand("Third"),
                ]),
            ])])],
        };

        let md = adf_to_markdown(&adf).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let cell = &rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let expand_count = cell
            .content
            .as_ref()
            .unwrap()
            .iter()
            .filter(|n| n.node_type == "nestedExpand")
            .count();
        assert_eq!(expand_count, 3, "All 3 expands should survive round-trip");
    }

    // ── Nested container directive tests ───────────────────────────

    #[test]
    fn nested_expand_inside_panel() {
        // Issue #714: the converter still produces panel→expand at the AST
        // level (this is what users may type), but the document fails ADF
        // schema validation, surfacing an actionable error before the API
        // call rather than an opaque Confluence HTTP 500.
        let md = ":::panel{type=info}\n:::expand{title=\"Details\"}\nHidden content\n:::\nMore panel content\n:::";
        let adf = markdown_to_adf(md).unwrap();

        let err = crate::atlassian::adf_validated::validate(&adf).unwrap_err();
        assert!(err.violations.iter().any(|v| matches!(
            v,
            crate::atlassian::adf_schema::AdfSchemaViolation::DisallowedChild {
                parent_type, child_type, ..
            } if parent_type == "panel" && child_type == "expand"
        )));
    }

    #[test]
    fn nested_expand_inside_table_cell() {
        // Issue #714: tableCell → expand is a Confluence content-model
        // violation. Table cells require `nestedExpand` instead. Validation
        // catches this before the API call.
        let md = "::::table\n:::tr\n:::td\n:::expand{title=\"Details\"}\nExpand content\n:::\n:::\n:::\n::::";
        let adf = markdown_to_adf(md).unwrap();

        let err = crate::atlassian::adf_validated::validate(&adf).unwrap_err();
        assert!(err.violations.iter().any(|v| matches!(
            v,
            crate::atlassian::adf_schema::AdfSchemaViolation::DisallowedChild {
                parent_type, child_type, ..
            } if parent_type == "tableCell" && child_type == "expand"
        )));
    }

    #[test]
    fn nested_expand_inside_layout_column() {
        // Issue #714 sanity check: `expand` inside a `layoutColumn` is
        // legitimate per the ADF schema and must NOT trigger validation.
        // Note: layoutSection requires 2..=3 columns per #733's quantifier
        // checks, so the markdown declares two columns.
        let md = ":::layout\n:::column{width=50}\n:::expand{title=\"Col Expand\"}\nExpanded\n:::\n:::\n:::column{width=50}\nFiller paragraph.\n:::\n:::";
        let adf = markdown_to_adf(md).unwrap();

        assert_eq!(adf.content.len(), 1);
        assert_eq!(adf.content[0].node_type, "layoutSection");

        let columns = adf.content[0].content.as_ref().unwrap();
        assert_eq!(columns.len(), 2);
        let col_content = columns[0].content.as_ref().unwrap();
        assert!(
            col_content.iter().any(|n| n.node_type == "expand"),
            "Column should contain an expand node, got: {:?}",
            col_content.iter().map(|n| &n.node_type).collect::<Vec<_>>()
        );

        // Validation must not flag this legitimate nesting.
        crate::atlassian::adf_validated::validate(&adf).unwrap();
    }

    #[test]
    fn expand_localid_in_directive_attrs() {
        // Issue #412: localId should be in directive attrs, not trailing text
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"expand","attrs":{"localId":"exp-001","title":"Details"},"content":[
            {"type":"paragraph","content":[{"type":"text","text":"body"}]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=exp-001"),
            "should contain localId: {md}"
        );
        assert!(
            md.contains(":::expand{"),
            "should have expand directive with attrs: {md}"
        );
        assert!(
            !md.contains(":::\n{localId="),
            "localId should NOT be trailing: {md}"
        );
    }

    #[test]
    fn expand_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"expand","attrs":{"localId":"exp-001","title":"Details"},"content":[
            {"type":"paragraph","content":[{"type":"text","text":"body"}]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let expand = &rt.content[0];
        assert_eq!(expand.node_type, "expand");
        assert_eq!(
            expand.local_id.as_deref(),
            Some("exp-001"),
            "expand localId should survive round-trip"
        );
        assert_eq!(
            expand.attrs.as_ref().unwrap()["title"],
            "Details",
            "expand title should survive round-trip"
        );
    }

    #[test]
    fn nested_expand_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"nestedExpand","attrs":{"localId":"ne-001","title":"S"},"content":[
            {"type":"paragraph","content":[{"type":"text","text":"content"}]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(":::nested-expand{"),
            "should have directive: {md}"
        );
        assert!(md.contains("localId=ne-001"), "should have localId: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let ne = &rt.content[0];
        assert_eq!(ne.node_type, "nestedExpand");
        assert_eq!(ne.local_id.as_deref(), Some("ne-001"));
    }

    #[test]
    fn nested_expand_localid_followed_by_content() {
        // Issue #412 reproducer: localId must not leak into following paragraph
        let adf_json = "{\
            \"version\":1,\"type\":\"doc\",\"content\":[\
              {\"type\":\"nestedExpand\",\"attrs\":{\"localId\":\"exp-001\",\"title\":\"S\"},\"content\":[\
                {\"type\":\"paragraph\",\"content\":[{\"type\":\"text\",\"text\":\"\\u00a0\"}]}\
              ]},\
              {\"type\":\"paragraph\",\"content\":[{\"type\":\"text\",\"text\":\"after\"}]}\
            ]}";
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        // nestedExpand should have localId
        let ne = &rt.content[0];
        assert_eq!(ne.node_type, "nestedExpand");
        assert_eq!(
            ne.local_id.as_deref(),
            Some("exp-001"),
            "nestedExpand should preserve localId"
        );
        // Following paragraph should contain "after", not "{localId=...}"
        let para = &rt.content[1];
        assert_eq!(para.node_type, "paragraph");
        let text = para.content.as_ref().unwrap()[0]
            .text
            .as_deref()
            .unwrap_or("");
        assert!(
            !text.contains("localId"),
            "following paragraph should not contain localId: {text}"
        );
        assert!(
            text.contains("after"),
            "following paragraph should contain 'after': {text}"
        );
    }

    #[test]
    fn expand_localid_without_title() {
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"expand","attrs":{"localId":"exp-002"},"content":[
            {"type":"paragraph","content":[{"type":"text","text":"no title"}]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(":::expand{localId=exp-002}"),
            "should have localId without title: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(rt.content[0].local_id.as_deref(), Some("exp-002"));
    }

    #[test]
    fn expand_localid_stripped() {
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"expand","attrs":{"localId":"exp-001","title":"X"},"content":[
            {"type":"paragraph","content":[{"type":"text","text":"body"}]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(!md.contains("localId"), "localId should be stripped: {md}");
        assert!(
            md.contains(":::expand{title=\"X\"}"),
            "title should remain: {md}"
        );
    }

    // ── Issue #444: top-level localId and parameters on expand ──

    #[test]
    fn expand_top_level_localid_roundtrip() {
        // localId as a top-level field (not inside attrs) should survive round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"expand","attrs":{"title":"My Section"},"localId":"abc-123","content":[
            {"type":"paragraph","content":[{"type":"text","text":"hello"}]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        assert_eq!(doc.content[0].local_id.as_deref(), Some("abc-123"));
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=abc-123"),
            "JFM should contain localId: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let expand = &rt.content[0];
        assert_eq!(expand.node_type, "expand");
        assert_eq!(expand.local_id.as_deref(), Some("abc-123"));
        assert_eq!(
            expand.attrs.as_ref().unwrap()["title"],
            "My Section",
            "title should survive round-trip"
        );
    }

    #[test]
    fn expand_parameters_roundtrip() {
        // parameters (macroMetadata) should survive round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"expand","attrs":{"title":"Props"},"parameters":{"macroMetadata":{"macroId":{"value":"m-001"},"schemaVersion":{"value":"1"}}},"content":[
            {"type":"paragraph","content":[{"type":"text","text":"body"}]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        assert!(doc.content[0].parameters.is_some());
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("params="), "JFM should contain params: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let expand = &rt.content[0];
        let params = expand
            .parameters
            .as_ref()
            .expect("parameters should survive round-trip");
        assert_eq!(params["macroMetadata"]["macroId"]["value"], "m-001");
        assert_eq!(params["macroMetadata"]["schemaVersion"]["value"], "1");
    }

    #[test]
    fn expand_localid_and_parameters_roundtrip() {
        // Issue #444: both localId and parameters on expand should survive round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"expand","attrs":{"title":"My Section"},"localId":"abc-123","parameters":{"macroMetadata":{"macroId":{"value":"macro-001"},"schemaVersion":{"value":"1"},"title":"Page Properties"}},"content":[{"type":"paragraph","content":[{"type":"text","text":"hello"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let expand = &rt.content[0];
        assert_eq!(expand.node_type, "expand");
        assert_eq!(expand.local_id.as_deref(), Some("abc-123"));
        assert_eq!(expand.attrs.as_ref().unwrap()["title"], "My Section");
        let params = expand
            .parameters
            .as_ref()
            .expect("parameters should survive");
        assert_eq!(params["macroMetadata"]["macroId"]["value"], "macro-001");
        assert_eq!(params["macroMetadata"]["title"], "Page Properties");
    }

    #[test]
    fn nested_expand_top_level_localid_and_parameters_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"nestedExpand","attrs":{"title":"Nested"},"localId":"ne-100","parameters":{"macroMetadata":{"macroId":{"value":"nm-001"}}},"content":[
            {"type":"paragraph","content":[{"type":"text","text":"inner"}]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(":::nested-expand{"),
            "should use nested-expand: {md}"
        );
        assert!(md.contains("localId=ne-100"), "should have localId: {md}");
        assert!(md.contains("params="), "should have params: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        let ne = &rt.content[0];
        assert_eq!(ne.node_type, "nestedExpand");
        assert_eq!(ne.local_id.as_deref(), Some("ne-100"));
        assert_eq!(
            ne.parameters.as_ref().unwrap()["macroMetadata"]["macroId"]["value"],
            "nm-001"
        );
    }

    #[test]
    fn expand_top_level_localid_stripped() {
        // strip_local_ids should strip top-level localId too
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"expand","attrs":{"title":"X"},"localId":"exp-strip","content":[
            {"type":"paragraph","content":[{"type":"text","text":"body"}]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(!md.contains("localId"), "localId should be stripped: {md}");
        assert!(
            md.contains(":::expand{title=\"X\"}"),
            "title should remain: {md}"
        );
    }

    #[test]
    fn expand_parameters_without_localid() {
        // parameters without localId should work
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"expand","attrs":{"title":"P"},"parameters":{"macroMetadata":{"macroId":{"value":"solo"}}},"content":[
            {"type":"paragraph","content":[{"type":"text","text":"data"}]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(!md.contains("localId"), "no localId: {md}");
        assert!(md.contains("params="), "has params: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        assert!(rt.content[0].local_id.is_none());
        assert_eq!(
            rt.content[0].parameters.as_ref().unwrap()["macroMetadata"]["macroId"]["value"],
            "solo"
        );
    }

    #[test]
    fn expand_localid_without_parameters() {
        // top-level localId without parameters should work
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"expand","attrs":{"title":"L"},"localId":"lid-only","content":[
            {"type":"paragraph","content":[{"type":"text","text":"txt"}]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("localId=lid-only"), "has localId: {md}");
        assert!(!md.contains("params="), "no params: {md}");
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(rt.content[0].local_id.as_deref(), Some("lid-only"));
        assert!(rt.content[0].parameters.is_none());
    }

    #[test]
    fn nested_panel_inside_panel() {
        let md = ":::panel{type=info}\n:::panel{type=warning}\nInner warning\n:::\n:::";
        let adf = markdown_to_adf(md).unwrap();

        // Outer panel should exist
        assert_eq!(adf.content.len(), 1);
        assert_eq!(adf.content[0].node_type, "panel");

        // Outer panel should contain an inner panel (not have it truncated)
        let panel_content = adf.content[0].content.as_ref().unwrap();
        assert!(
            panel_content.iter().any(|n| n.node_type == "panel"),
            "Outer panel should contain an inner panel, got: {:?}",
            panel_content
                .iter()
                .map(|n| &n.node_type)
                .collect::<Vec<_>>()
        );
    }

    #[test]
    fn content_after_directive_table_is_preserved() {
        // Issue #361: content after a ::::table block was silently dropped
        let md = "\
## Before table

::::table{layout=default}
:::tr
:::th{}
Cell
:::
:::
::::

## After table

Paragraph after.";
        let adf = markdown_to_adf(md).unwrap();
        let types: Vec<&str> = adf.content.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["heading", "table", "heading", "paragraph"],
            "Content after table was dropped: got {types:?}"
        );
    }

    #[test]
    fn paragraph_after_directive_table_is_preserved() {
        // Issue #361: minimal reproducer — paragraph after table
        let md = "\
::::table{layout=default}
:::tr
:::th{}
Header
:::
:::
::::

Just a paragraph.";
        let adf = markdown_to_adf(md).unwrap();
        let types: Vec<&str> = adf.content.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["table", "paragraph"],
            "Paragraph after table was dropped: got {types:?}"
        );
    }

    #[test]
    fn extension_after_directive_table_is_preserved() {
        // Issue #361: extension after table
        let md = "\
::::table{layout=default}
:::tr
:::th{}
Header
:::
:::
::::

::extension{type=com.atlassian.confluence.macro.core key=toc}";
        let adf = markdown_to_adf(md).unwrap();
        let types: Vec<&str> = adf.content.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["table", "extension"],
            "Extension after table was dropped: got {types:?}"
        );
    }

    #[test]
    fn multiple_blocks_after_directive_table() {
        // Issue #361: multiple blocks after table, including another table
        let md = "\
## Heading 1

::::table{layout=default}
:::tr
:::td{}
A
:::
:::td{}
B
:::
:::
::::

## Heading 2

Some text.

---

::::table{layout=default}
:::tr
:::th{}
C
:::
:::
::::

## Heading 3";
        let adf = markdown_to_adf(md).unwrap();
        let types: Vec<&str> = adf.content.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec![
                "heading",
                "table",
                "heading",
                "paragraph",
                "rule",
                "table",
                "heading"
            ],
            "Content after tables was dropped: got {types:?}"
        );
    }

    // ── Table caption tests (issue #382) ────────────────────────────

    #[test]
    fn adf_table_caption_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![
                AdfNode::table_row(vec![AdfNode::table_cell(vec![AdfNode::paragraph(vec![
                    AdfNode::text("cell"),
                ])])]),
                AdfNode::caption(vec![AdfNode::text("Table caption")]),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("::::table"),
            "table with caption must use directive form"
        );
        assert!(
            md.contains(":::caption"),
            "caption directive missing, got: {md}"
        );
        assert!(
            md.contains("Table caption"),
            "caption text missing, got: {md}"
        );
    }

    #[test]
    fn directive_table_caption_parses() {
        let md = "::::table\n:::tr\n:::td\ncell\n:::\n:::\n:::caption\nTable caption\n:::\n::::\n";
        let doc = markdown_to_adf(md).unwrap();
        let table = &doc.content[0];
        assert_eq!(table.node_type, "table");
        let children = table.content.as_ref().unwrap();
        assert_eq!(children.len(), 2, "expected row + caption");
        assert_eq!(children[0].node_type, "tableRow");
        assert_eq!(children[1].node_type, "caption");
        let caption_content = children[1].content.as_ref().unwrap();
        assert_eq!(caption_content[0].text.as_deref(), Some("Table caption"));
    }

    #[test]
    fn table_caption_round_trip_from_adf_json() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default"},"content":[
          {"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]},
          {"type":"caption","content":[{"type":"text","text":"Table caption"}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("Table caption"), "caption text lost in ADF→JFM");
        let round_tripped = markdown_to_adf(&md).unwrap();
        let children = round_tripped.content[0].content.as_ref().unwrap();
        let caption = children.iter().find(|n| n.node_type == "caption");
        assert!(caption.is_some(), "caption lost on round-trip");
        let caption_text = caption.unwrap().content.as_ref().unwrap();
        assert_eq!(caption_text[0].text.as_deref(), Some("Table caption"));
    }

    #[test]
    fn table_caption_with_inline_marks_round_trips() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![
                AdfNode::table_row(vec![AdfNode::table_cell(vec![AdfNode::paragraph(vec![
                    AdfNode::text("data"),
                ])])]),
                AdfNode::caption(vec![
                    AdfNode::text("Caption with "),
                    AdfNode::text_with_marks("bold", vec![AdfMark::strong()]),
                ]),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(md.contains("**bold**"), "bold mark missing in caption");
        let round_tripped = markdown_to_adf(&md).unwrap();
        let caption = round_tripped.content[0]
            .content
            .as_ref()
            .unwrap()
            .iter()
            .find(|n| n.node_type == "caption")
            .expect("caption node missing after round-trip");
        let inlines = caption.content.as_ref().unwrap();
        let bold_node = inlines.iter().find(|n| {
            n.marks
                .as_ref()
                .is_some_and(|m| m.iter().any(|mk| mk.mark_type == "strong"))
        });
        assert!(bold_node.is_some(), "bold mark lost in caption round-trip");
    }

    // ── table caption localId tests (issue #524) ──────────────────────

    #[test]
    fn table_caption_localid_roundtrip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default"},"content":[
          {"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]},
          {"type":"caption","attrs":{"localId":"abcdef123456"},"content":[{"type":"text","text":"Table with localId"}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("localId=abcdef123456"),
            "table caption localId should appear in markdown: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let caption = rt.content[0]
            .content
            .as_ref()
            .unwrap()
            .iter()
            .find(|n| n.node_type == "caption")
            .expect("caption should survive round-trip");
        assert_eq!(
            caption.attrs.as_ref().unwrap()["localId"],
            "abcdef123456",
            "table caption localId should round-trip"
        );
    }

    #[test]
    fn table_caption_without_localid_unchanged() {
        let md = "::::table\n:::tr\n:::td\ncell\n:::\n:::\n:::caption\nPlain caption\n:::\n::::\n";
        let doc = markdown_to_adf(md).unwrap();
        let caption = doc.content[0]
            .content
            .as_ref()
            .unwrap()
            .iter()
            .find(|n| n.node_type == "caption")
            .unwrap();
        assert!(
            caption.attrs.is_none(),
            "table caption without localId should not gain attrs"
        );
        let md2 = adf_to_markdown(&doc).unwrap();
        assert!(!md2.contains("localId"), "no localId should appear: {md2}");
    }

    #[test]
    fn table_caption_localid_stripped_when_option_set() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default"},"content":[
          {"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"cell"}]}]}]},
          {"type":"caption","attrs":{"localId":"abcdef123456"},"content":[{"type":"text","text":"Stripped"}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let opts = RenderOptions {
            strip_local_ids: true,
            ..Default::default()
        };
        let md = adf_to_markdown_with_options(&doc, &opts).unwrap();
        assert!(
            !md.contains("localId"),
            "table caption localId should be stripped: {md}"
        );
    }

    #[test]
    #[test]
    fn tablecell_empty_attrs_preserved_on_roundtrip() {
        // Issue #385: tableCell with empty attrs:{} dropped on round-trip
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"hello"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let rows = round_tripped.content[0].content.as_ref().unwrap();
        let cell = &rows[0].content.as_ref().unwrap()[0];
        assert!(
            cell.attrs.is_some(),
            "tableCell attrs should be preserved, got None"
        );
        assert_eq!(
            cell.attrs.as_ref().unwrap(),
            &serde_json::json!({}),
            "tableCell attrs should be an empty object"
        );
    }

    #[test]
    fn tablecell_empty_attrs_serialized_in_json() {
        // Issue #385: ensure the serialized JSON includes "attrs":{}
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"hello"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let json = serde_json::to_string(&round_tripped).unwrap();
        assert!(
            json.contains(r#""attrs":{}"#),
            "serialized JSON should contain \"attrs\":{{}}, got: {json}"
        );
    }

    #[test]
    fn tablecell_empty_attrs_renders_braces_in_markdown() {
        // Issue #385: tableCell with empty attrs should render {} prefix in pipe tables
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableHeader","content":[{"type":"paragraph","content":[{"type":"text","text":"H"}]}]},{"type":"tableHeader","content":[{"type":"paragraph","content":[{"type":"text","text":"H2"}]}]}]},{"type":"tableRow","content":[{"type":"tableCell","attrs":{},"content":[{"type":"paragraph","content":[{"type":"text","text":"hello"}]}]},{"type":"tableCell","content":[{"type":"paragraph","content":[{"type":"text","text":"world"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // Cell with attrs:{} should have {} prefix, cell without attrs should not
        assert!(
            md.contains("{} hello"),
            "cell with empty attrs should render '{{}} hello', got: {md}"
        );
        assert!(
            !md.contains("{} world"),
            "cell without attrs should not render '{{}}', got: {md}"
        );
    }

    #[test]
    fn tablecell_no_attrs_unchanged_on_roundtrip() {
        // Ensure tableCell without attrs stays without attrs
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableCell","content":[{"type":"paragraph","content":[{"type":"text","text":"hello"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let rows = round_tripped.content[0].content.as_ref().unwrap();
        let cell = &rows[0].content.as_ref().unwrap()[0];
        assert!(
            cell.attrs.is_none(),
            "tableCell without attrs should stay None, got: {:?}",
            cell.attrs
        );
    }

    #[test]
    fn tablecell_nonempty_attrs_preserved_on_roundtrip() {
        // Ensure tableCell with non-empty attrs still works
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableHeader","content":[{"type":"paragraph","content":[{"type":"text","text":"H"}]}]}]},{"type":"tableRow","content":[{"type":"tableCell","attrs":{"background":"#DEEBFF","colspan":2},"content":[{"type":"paragraph","content":[{"type":"text","text":"highlighted"}]}]}]}]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let rows = round_tripped.content[0].content.as_ref().unwrap();
        let cell = &rows[1].content.as_ref().unwrap()[0];
        let attrs = cell.attrs.as_ref().unwrap();
        assert_eq!(attrs["background"], "#DEEBFF");
        assert_eq!(attrs["colspan"], 2);
    }

    #[test]
    fn pipe_table_not_used_when_caption_present() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::table(vec![
                AdfNode::table_row(vec![AdfNode::table_header(vec![AdfNode::paragraph(vec![
                    AdfNode::text("H"),
                ])])]),
                AdfNode::table_row(vec![AdfNode::table_cell(vec![AdfNode::paragraph(vec![
                    AdfNode::text("D"),
                ])])]),
                AdfNode::caption(vec![AdfNode::text("cap")]),
            ])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("::::table"),
            "pipe syntax should not be used when caption is present"
        );
    }

    // ── Issue #402: ordered-list-like text in list item hardBreak ──

    #[test]
    fn hardbreak_with_ordered_marker_in_bullet_item_roundtrips() {
        // Issue #402: text starting with "2. " after a hardBreak inside a
        // bullet list item must not be re-parsed as a new ordered list.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[{"type":"paragraph","content":[
            {"type":"text","text":"1. First item"},
            {"type":"hardBreak"},
            {"type":"text","text":"2. Honouring existing commitments"}
          ]}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();

        // The continuation line must be indented so it stays within the list item.
        assert!(
            md.contains("  2. Honouring"),
            "Continuation line should be indented, got:\n{md}"
        );

        // Round-trip back to ADF
        let rt = markdown_to_adf(&md).unwrap();
        let list = &rt.content[0];
        assert_eq!(list.node_type, "bulletList");
        let items = list.content.as_ref().unwrap();
        assert_eq!(
            items.len(),
            1,
            "Should be one list item, got {}",
            items.len()
        );

        let para = &items[0].content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "text"],
            "Expected text+hardBreak+text, got {types:?}"
        );
        assert_eq!(
            inlines[2].text.as_deref().unwrap(),
            "2. Honouring existing commitments"
        );
    }

    #[test]
    fn hardbreak_with_ordered_marker_in_ordered_item_roundtrips() {
        // Same as above but inside an ordered list.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[
          {"type":"listItem","content":[{"type":"paragraph","content":[
            {"type":"text","text":"Introduction  "},
            {"type":"hardBreak"},
            {"type":"text","text":"3. Third point"}
          ]}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let list = &rt.content[0];
        assert_eq!(list.node_type, "orderedList");
        let items = list.content.as_ref().unwrap();
        assert_eq!(items.len(), 1);

        let para = &items[0].content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(inlines[2].text.as_deref().unwrap(), "3. Third point");
    }

    #[test]
    fn hardbreak_with_bullet_marker_in_bullet_item_roundtrips() {
        // Text starting with "- " after a hardBreak must not become a nested bullet list.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[{"type":"paragraph","content":[
            {"type":"text","text":"Header  "},
            {"type":"hardBreak"},
            {"type":"text","text":"- not a sub-item"}
          ]}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let list = &rt.content[0];
        assert_eq!(list.node_type, "bulletList");
        let items = list.content.as_ref().unwrap();
        assert_eq!(
            items.len(),
            1,
            "Should be one list item, not {}",
            items.len()
        );

        let para = &items[0].content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(inlines[2].text.as_deref().unwrap(), "- not a sub-item");
    }

    #[test]
    fn hardbreak_continuation_followed_by_sub_list() {
        // A hardBreak continuation line followed by a real sub-list.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[
            {"type":"paragraph","content":[
              {"type":"text","text":"Main item  "},
              {"type":"hardBreak"},
              {"type":"text","text":"continued here"}
            ]},
            {"type":"bulletList","content":[
              {"type":"listItem","content":[{"type":"paragraph","content":[
                {"type":"text","text":"sub-item"}
              ]}]}
            ]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let list = &rt.content[0];
        let items = list.content.as_ref().unwrap();
        assert_eq!(items.len(), 1);

        let item_content = items[0].content.as_ref().unwrap();
        assert_eq!(item_content.len(), 2, "Expected paragraph + nested list");
        assert_eq!(item_content[0].node_type, "paragraph");
        assert_eq!(item_content[1].node_type, "bulletList");

        // Check the paragraph has hardBreak
        let inlines = item_content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
    }

    #[test]
    fn multiple_hardbreaks_with_numbered_text_roundtrip() {
        // Multiple hardBreaks where each continuation resembles an ordered list.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[{"type":"paragraph","content":[
            {"type":"text","text":"Preamble  "},
            {"type":"hardBreak"},
            {"type":"text","text":"1. Alpha  "},
            {"type":"hardBreak"},
            {"type":"text","text":"2. Bravo"}
          ]}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 1);

        let inlines = items[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "text", "hardBreak", "text"]
        );
    }

    #[test]
    fn trailing_hardbreak_in_bullet_item_roundtrips() {
        // A hardBreak as the last inline node with no text after it.
        // Exercises the `break` path in the continuation loop and the
        // empty-line rendering branch.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[{"type":"paragraph","content":[
            {"type":"text","text":"ends with break"},
            {"type":"hardBreak"}
          ]}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let list = &rt.content[0];
        assert_eq!(list.node_type, "bulletList");
        let inlines = list.content.as_ref().unwrap()[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak"]);
    }

    #[test]
    fn trailing_hardbreak_in_ordered_item_roundtrips() {
        // Same as above but in an ordered list, covering the ordered-list
        // continuation `break` path.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[
          {"type":"listItem","content":[{"type":"paragraph","content":[
            {"type":"text","text":"ends with break"},
            {"type":"hardBreak"}
          ]}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let list = &rt.content[0];
        assert_eq!(list.node_type, "orderedList");
        let inlines = list.content.as_ref().unwrap()[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak"]);
    }

    #[test]
    fn trailing_space_hardbreak_continuation_in_bullet_item() {
        // Exercises the `ends_with("  ")` path in `has_trailing_hard_break`
        // by parsing hand-written markdown that uses trailing-space style
        // hardBreaks instead of backslash style.
        let md = "- first line  \n  2. continued\n";
        let doc = markdown_to_adf(md).unwrap();

        let list = &doc.content[0];
        assert_eq!(list.node_type, "bulletList");
        let items = list.content.as_ref().unwrap();
        assert_eq!(
            items.len(),
            1,
            "Should be one list item, got {}",
            items.len()
        );

        let para = &items[0].content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(inlines[2].text.as_deref().unwrap(), "2. continued");
    }

    #[test]
    fn trailing_space_hardbreak_continuation_in_ordered_item() {
        // Same as above but for ordered list, exercising the trailing-space
        // path in the ordered-list continuation loop.
        let md = "1. first line  \n  - continued\n";
        let doc = markdown_to_adf(md).unwrap();

        let list = &doc.content[0];
        assert_eq!(list.node_type, "orderedList");
        let items = list.content.as_ref().unwrap();
        assert_eq!(
            items.len(),
            1,
            "Should be one list item, got {}",
            items.len()
        );

        let para = &items[0].content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(inlines[2].text.as_deref().unwrap(), "- continued");
    }

    #[test]
    fn multi_paragraph_list_item_with_ordered_marker_roundtrips() {
        // Issue #402 comment: a listItem with a second paragraph starting
        // with "2. " must not become a separate orderedList.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[
            {"type":"paragraph","content":[{"type":"text","text":"some preamble"}]},
            {"type":"paragraph","content":[{"type":"text","text":"2. Honouring existing commitments"}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1, "Should be one top-level block");
        let list = &rt.content[0];
        assert_eq!(list.node_type, "bulletList");
        let items = list.content.as_ref().unwrap();
        assert_eq!(items.len(), 1);
        let item_content = items[0].content.as_ref().unwrap();
        assert_eq!(
            item_content.len(),
            2,
            "Expected 2 paragraphs inside the list item, got {}",
            item_content.len()
        );
        assert_eq!(item_content[0].node_type, "paragraph");
        assert_eq!(item_content[1].node_type, "paragraph");
        let text = item_content[1].content.as_ref().unwrap()[0]
            .text
            .as_deref()
            .unwrap();
        assert_eq!(text, "2. Honouring existing commitments");
    }

    #[test]
    fn multi_paragraph_list_item_with_bullet_marker_roundtrips() {
        // Paragraph starting with "- " inside a list item.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[
            {"type":"paragraph","content":[{"type":"text","text":"preamble"}]},
            {"type":"paragraph","content":[{"type":"text","text":"- not a sub-item"}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 1);
        let item_content = items[0].content.as_ref().unwrap();
        assert_eq!(item_content.len(), 2);
        assert_eq!(item_content[1].node_type, "paragraph");
        let text = item_content[1].content.as_ref().unwrap()[0]
            .text
            .as_deref()
            .unwrap();
        assert_eq!(text, "- not a sub-item");
    }

    #[test]
    fn backslash_escape_in_inline_text() {
        // Verify that `\. ` is unescaped to `. ` in inline parsing.
        let nodes = parse_inline(r"2\. text");
        assert_eq!(nodes.len(), 1, "Should be one text node");
        assert_eq!(nodes[0].text.as_deref().unwrap(), "2. text");
    }

    #[test]
    fn escape_list_marker_ordered() {
        assert_eq!(escape_list_marker("2. text"), r"2\. text");
        assert_eq!(escape_list_marker("10. tenth"), r"10\. tenth");
    }

    #[test]
    fn escape_list_marker_bullet() {
        assert_eq!(escape_list_marker("- text"), r"\- text");
        assert_eq!(escape_list_marker("* text"), r"\* text");
        assert_eq!(escape_list_marker("+ text"), r"\+ text");
    }

    #[test]
    fn escape_list_marker_plain() {
        assert_eq!(escape_list_marker("plain text"), "plain text");
        assert_eq!(escape_list_marker("no. marker"), "no. marker");
    }

    #[test]
    fn escape_emoji_shortcodes_basic() {
        assert_eq!(escape_emoji_shortcodes(":fire:"), r"\:fire:");
        assert_eq!(
            escape_emoji_shortcodes("hello :wave: world"),
            r"hello \:wave: world"
        );
    }

    #[test]
    fn escape_emoji_shortcodes_double_colon() {
        // Only the colon that starts `:Active:` needs escaping
        assert_eq!(
            escape_emoji_shortcodes("Status::Active::Running"),
            r"Status:\:Active::Running"
        );
    }

    #[test]
    fn escape_emoji_shortcodes_no_match() {
        // Lone colons, numeric-only between colons like 10:30
        assert_eq!(escape_emoji_shortcodes("Time is 10:30"), "Time is 10:30");
        assert_eq!(escape_emoji_shortcodes("no colons here"), "no colons here");
        assert_eq!(escape_emoji_shortcodes("trailing:"), "trailing:");
        assert_eq!(escape_emoji_shortcodes(":"), ":");
    }

    #[test]
    fn escape_emoji_shortcodes_mixed() {
        assert_eq!(
            escape_emoji_shortcodes("Alert :fire: on pod:pod42"),
            r"Alert \:fire: on pod:pod42"
        );
    }

    #[test]
    fn escape_emoji_shortcodes_unicode() {
        // Issue #552: Unicode alphanumeric chars must be escaped to match
        // `try_parse_emoji_shortcode`, which uses `is_alphanumeric` (not the
        // ASCII-only variant).  Without this, `:Café:` rendered un-escaped
        // would be re-parsed as an emoji on round-trip.
        assert_eq!(escape_emoji_shortcodes(":Café:"), r"\:Café:");
        assert_eq!(escape_emoji_shortcodes(":über:"), r"\:über:");
        assert_eq!(escape_emoji_shortcodes(":配置:"), r"\:配置:");
        assert_eq!(
            escape_emoji_shortcodes("ZBC::配置::Production"),
            r"ZBC:\:配置::Production"
        );
    }

    #[test]
    fn escape_emoji_shortcodes_mixed_script_name() {
        // Issue #552: A name that mixes ASCII and Unicode alphanumerics is
        // still a single valid shortcode under `is_alphanumeric`.
        assert_eq!(escape_emoji_shortcodes(":abc配置:"), r"\:abc配置:");
        assert_eq!(escape_emoji_shortcodes(":配置abc:"), r"\:配置abc:");
    }

    #[test]
    fn escape_emoji_shortcodes_unicode_followed_by_non_colon() {
        // `:Café world:` — `Café` is alphanumeric but the terminator is a
        // space, not `:`, so the `after + name_end < text.len()` path is
        // exercised but the final `== b':'` check bails out and nothing
        // gets escaped.  Guards the negative branch of the predicate.
        assert_eq!(escape_emoji_shortcodes(":Café world:"), ":Café world:");
    }

    #[test]
    fn escape_emoji_shortcodes_name_runs_to_end() {
        // Colon followed by alphanumerics to end of string: `.find(...)` returns
        // `None`, so `name_end` falls back to the full remaining length via
        // `map_or`.  The `after + name_end < text.len()` check then fails and
        // nothing is escaped.  Exercises the `map_or` default branch for both
        // ASCII and Unicode names.
        assert_eq!(escape_emoji_shortcodes(":abc"), ":abc");
        assert_eq!(escape_emoji_shortcodes(":配置"), ":配置");
    }

    #[test]
    fn unicode_shortcode_pattern_text_round_trips_as_text() {
        // Issue #552: A text node containing `:Café:` must round-trip as text,
        // not be split into text + emoji nodes.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Visit :Café: today"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        assert_eq!(
            content.len(),
            1,
            "should be a single text node, got: {content:?}"
        );
        assert_eq!(content[0].node_type, "text");
        assert_eq!(content[0].text.as_deref().unwrap(), "Visit :Café: today");
    }

    #[test]
    fn unicode_double_colon_pattern_text_round_trips() {
        // Issue #552: `ZBC::配置::Production` should round-trip without splitting.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Use ZBC::配置::Production for prod"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();

        let md = adf_to_markdown(&doc).unwrap();
        let round_tripped = markdown_to_adf(&md).unwrap();
        let content = round_tripped.content[0].content.as_ref().unwrap();

        assert_eq!(
            content.len(),
            1,
            "should be a single text node, got: {content:?}"
        );
        assert_eq!(
            content[0].text.as_deref().unwrap(),
            "Use ZBC::配置::Production for prod"
        );
    }

    #[test]
    fn merge_adjacent_text_nodes() {
        let mut nodes = vec![AdfNode::text("a"), AdfNode::text("b"), AdfNode::text("c")];
        merge_adjacent_text(&mut nodes);
        assert_eq!(nodes.len(), 1);
        assert_eq!(nodes[0].text.as_deref().unwrap(), "abc");
    }

    // ── Issue #455: text after hardBreak in paragraph re-parsed as list ──

    #[test]
    fn issue_455_paragraph_hardbreak_ordered_marker_roundtrips() {
        // Issue #455: "1. text" after a hardBreak in a paragraph must not
        // become an ordered list.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Introduction: "},
          {"type":"hardBreak"},
          {"type":"text","text":"1. This text follows a hardBreak"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1, "Should remain one block");
        assert_eq!(rt.content[0].node_type, "paragraph");
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(
            inlines[2].text.as_deref(),
            Some("1. This text follows a hardBreak")
        );
    }

    #[test]
    fn issue_455_paragraph_hardbreak_bullet_marker_roundtrips() {
        // Issue #455 variant: "- text" after a hardBreak in a paragraph.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Intro"},
          {"type":"hardBreak"},
          {"type":"text","text":"- not a list item"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "paragraph");
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(inlines[2].text.as_deref(), Some("- not a list item"));
    }

    #[test]
    fn issue_455_paragraph_hardbreak_heading_marker_roundtrips() {
        // Issue #455 variant: "# text" after a hardBreak in a paragraph.
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Intro"},
          {"type":"hardBreak"},
          {"type":"text","text":"# not a heading"}
        ]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "paragraph");
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(inlines[2].text.as_deref(), Some("# not a heading"));
    }

    #[test]
    fn issue_455_paragraph_hardbreak_blockquote_marker_roundtrips() {
        // Issue #455 variant: "> text" after a hardBreak in a paragraph.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Intro"},
          {"type":"hardBreak"},
          {"type":"text","text":"> not a blockquote"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "paragraph");
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(inlines[2].text.as_deref(), Some("> not a blockquote"));
    }

    #[test]
    fn issue_455_paragraph_multiple_hardbreaks_with_ordered_markers() {
        // Multiple hardBreaks in a paragraph, each followed by "N. text".
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Preamble"},
          {"type":"hardBreak"},
          {"type":"text","text":"1. First"},
          {"type":"hardBreak"},
          {"type":"text","text":"2. Second"},
          {"type":"hardBreak"},
          {"type":"text","text":"3. Third"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "paragraph");
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec![
                "text",
                "hardBreak",
                "text",
                "hardBreak",
                "text",
                "hardBreak",
                "text"
            ]
        );
        assert_eq!(inlines[2].text.as_deref(), Some("1. First"));
        assert_eq!(inlines[4].text.as_deref(), Some("2. Second"));
        assert_eq!(inlines[6].text.as_deref(), Some("3. Third"));
    }

    #[test]
    fn issue_455_paragraph_hardbreak_jfm_indentation() {
        // Verify that ADF→JFM output indents continuation lines.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Intro"},
          {"type":"hardBreak"},
          {"type":"text","text":"1. continued"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("Intro\\\n  1. continued"),
            "Continuation should be 2-space-indented, got: {md:?}"
        );
    }

    #[test]
    fn issue_455_paragraph_hardbreak_from_jfm() {
        // Verify that JFM with 2-space-indented continuation is parsed
        // back as a single paragraph with hardBreak.
        let md = "Intro\\\n  1. This is continuation text\n";
        let doc = markdown_to_adf(md).unwrap();

        assert_eq!(doc.content.len(), 1);
        assert_eq!(doc.content[0].node_type, "paragraph");
        let inlines = doc.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(
            inlines[2].text.as_deref(),
            Some("1. This is continuation text")
        );
    }

    #[test]
    fn issue_455_paragraph_starts_with_ordered_marker_and_hardbreak() {
        // Coverage: first line IS a list marker AND paragraph has hardBreaks.
        // Exercises the escape_list_marker path on the first line of a
        // multi-line paragraph buf in the rendering code.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"1. Starting with a number"},
          {"type":"hardBreak"},
          {"type":"text","text":"continuation after break"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // First line should be escaped so it's not parsed as ordered list
        assert!(
            md.contains(r"1\. Starting with a number"),
            "First line should have escaped list marker, got: {md:?}"
        );
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "paragraph");
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(
            inlines[0].text.as_deref(),
            Some("1. Starting with a number")
        );
        assert_eq!(inlines[2].text.as_deref(), Some("continuation after break"));
    }

    #[test]
    fn ordered_marker_paragraph_in_table_cell_roundtrips() {
        // Issue #402: paragraph with "2. " text inside a tableCell must
        // not be re-parsed as an ordered list.
        let adf_json = r#"{"version":1,"type":"doc","content":[{
          "type":"table","attrs":{"isNumberColumnEnabled":false,"layout":"default"},
          "content":[{"type":"tableRow","content":[{
            "type":"tableCell","attrs":{"colspan":1,"rowspan":1},
            "content":[{"type":"paragraph","content":[
              {"type":"text","text":"2. Honouring existing commitments"}
            ]}]
          }]}]
        }]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let table = &rt.content[0];
        let cell = &table.content.as_ref().unwrap()[0].content.as_ref().unwrap()[0];
        let para = &cell.content.as_ref().unwrap()[0];
        assert_eq!(para.node_type, "paragraph");
        let text = para.content.as_ref().unwrap()[0].text.as_deref().unwrap();
        assert_eq!(text, "2. Honouring existing commitments");
    }

    #[test]
    fn bullet_marker_paragraph_standalone_roundtrips() {
        // A top-level paragraph starting with "- " must round-trip as
        // a paragraph, not a bullet list.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"paragraph","content":[
            {"type":"text","text":"- not a list item"}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(r"\- not a list item"),
            "Should escape the leading dash, got:\n{md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(rt.content[0].node_type, "paragraph");
        let text = rt.content[0].content.as_ref().unwrap()[0]
            .text
            .as_deref()
            .unwrap();
        assert_eq!(text, "- not a list item");
    }

    #[test]
    fn merge_adjacent_text_skips_non_text_nodes() {
        // Exercises the `else { i += 1 }` branch when adjacent nodes
        // are not both plain text.
        let mut nodes = vec![
            AdfNode::text("a"),
            AdfNode::hard_break(),
            AdfNode::text("b"),
        ];
        merge_adjacent_text(&mut nodes);
        assert_eq!(nodes.len(), 3);
    }

    #[test]
    fn star_bullet_paragraph_roundtrips() {
        // Paragraph starting with "* " must round-trip without becoming
        // a bullet list.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"paragraph","content":[
            {"type":"text","text":"* starred"}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(rt.content[0].node_type, "paragraph");
        assert_eq!(
            rt.content[0].content.as_ref().unwrap()[0]
                .text
                .as_deref()
                .unwrap(),
            "* starred"
        );
    }

    // ---- Issue #388 tests ----

    #[test]
    fn issue_388_ordered_list_with_strong_hardbreak_roundtrips() {
        // Issue #388: orderedList with 2 listItems, each containing
        // strong-marked text + hardBreak + plain text.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"orderedList","attrs":{"order":1},"content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Bold heading","marks":[{"type":"strong"}]},
                {"type":"hardBreak"},
                {"type":"text","text":"Content after break"}
              ]}
            ]},
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Second item","marks":[{"type":"strong"}]},
                {"type":"hardBreak"},
                {"type":"text","text":"More content"}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        // Must remain a single orderedList
        assert_eq!(
            rt.content.len(),
            1,
            "Should be 1 block (orderedList), got {}",
            rt.content.len()
        );
        assert_eq!(rt.content[0].node_type, "orderedList");
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            items.len(),
            2,
            "Should have 2 listItems, got {}",
            items.len()
        );

        // First item: text(strong) + hardBreak + text
        let p1 = items[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let types1: Vec<&str> = p1.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types1, vec!["text", "hardBreak", "text"]);
        assert_eq!(p1[0].text.as_deref(), Some("Bold heading"));
        assert_eq!(p1[2].text.as_deref(), Some("Content after break"));

        // Second item: text(strong) + hardBreak + text
        let p2 = items[1].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let types2: Vec<&str> = p2.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types2, vec!["text", "hardBreak", "text"]);
        assert_eq!(p2[0].text.as_deref(), Some("Second item"));
        assert_eq!(p2[2].text.as_deref(), Some("More content"));
    }

    #[test]
    fn issue_388_bullet_list_with_strong_hardbreak_roundtrips() {
        // Bullet list variant of issue #388.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"bulletList","content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"First","marks":[{"type":"strong"}]},
                {"type":"hardBreak"},
                {"type":"text","text":"details"}
              ]}
            ]},
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Second","marks":[{"type":"em"}]},
                {"type":"hardBreak"},
                {"type":"text","text":"more details"}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "bulletList");
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);

        let p1 = items[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        assert_eq!(p1[0].text.as_deref(), Some("First"));
        assert_eq!(p1[2].text.as_deref(), Some("details"));

        let p2 = items[1].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        assert_eq!(p2[0].text.as_deref(), Some("Second"));
        assert_eq!(p2[2].text.as_deref(), Some("more details"));
    }

    #[test]
    fn issue_388_ordered_list_hardbreak_jfm_indentation() {
        // Verify the JFM output has properly indented continuation lines.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"orderedList","attrs":{"order":1},"content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"heading","marks":[{"type":"strong"}]},
                {"type":"hardBreak"},
                {"type":"text","text":"body"}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("1. **heading**\\\n  body"),
            "Continuation should be indented, got:\n{md}"
        );
    }

    #[test]
    fn issue_388_ordered_list_hardbreak_from_jfm() {
        // Direct JFM → ADF: ordered list with hardBreak continuation.
        let md = "1. **bold**\\\n  continued\n2. **also bold**\\\n  also continued\n";
        let doc = markdown_to_adf(md).unwrap();

        assert_eq!(doc.content.len(), 1);
        assert_eq!(doc.content[0].node_type, "orderedList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);

        let p1 = items[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let types1: Vec<&str> = p1.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types1, vec!["text", "hardBreak", "text"]);
        assert_eq!(p1[0].text.as_deref(), Some("bold"));
        assert_eq!(p1[2].text.as_deref(), Some("continued"));

        let p2 = items[1].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let types2: Vec<&str> = p2.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types2, vec!["text", "hardBreak", "text"]);
    }

    #[test]
    fn issue_388_bullet_list_hardbreak_from_jfm() {
        // Direct JFM → ADF: bullet list with hardBreak continuation.
        let md = "- first\\\n  second\n- third\\\n  fourth\n";
        let doc = markdown_to_adf(md).unwrap();

        assert_eq!(doc.content.len(), 1);
        assert_eq!(doc.content[0].node_type, "bulletList");
        let items = doc.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);

        for (i, expected) in [("first", "second"), ("third", "fourth")]
            .iter()
            .enumerate()
        {
            let p = items[i].content.as_ref().unwrap()[0]
                .content
                .as_ref()
                .unwrap();
            let types: Vec<&str> = p.iter().map(|n| n.node_type.as_str()).collect();
            assert_eq!(types, vec!["text", "hardBreak", "text"]);
            assert_eq!(p[0].text.as_deref(), Some(expected.0));
            assert_eq!(p[2].text.as_deref(), Some(expected.1));
        }
    }

    #[test]
    fn issue_433_heading_hardbreak_roundtrips() {
        // Issue #433: hardBreak inside heading splits into heading + paragraph.
        let adf_json = r#"{"version":1,"type":"doc","content":[{
          "type":"heading",
          "attrs":{"level":1},
          "content":[
            {"type":"text","text":"Line one"},
            {"type":"hardBreak"},
            {"type":"text","text":"Line two"}
          ]
        }]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(
            rt.content.len(),
            1,
            "Should remain a single heading, got {} blocks",
            rt.content.len()
        );
        assert_eq!(rt.content[0].node_type, "heading");
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "text"],
            "hardBreak should be preserved, got: {types:?}"
        );
        assert_eq!(inlines[0].text.as_deref(), Some("Line one"));
        assert_eq!(inlines[2].text.as_deref(), Some("Line two"));
    }

    #[test]
    fn issue_433_heading_hardbreak_jfm_indentation() {
        // Verify the JFM output has properly indented continuation lines.
        let adf_json = r#"{"version":1,"type":"doc","content":[{
          "type":"heading",
          "attrs":{"level":2},
          "content":[
            {"type":"text","text":"Title"},
            {"type":"hardBreak"},
            {"type":"text","text":"Subtitle"}
          ]
        }]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("## Title\\\n  Subtitle"),
            "Continuation should be indented, got:\n{md}"
        );
    }

    #[test]
    fn issue_433_heading_hardbreak_from_jfm() {
        // Direct JFM → ADF: heading with hardBreak continuation.
        let md = "# First\\\n  Second\n";
        let doc = markdown_to_adf(md).unwrap();

        assert_eq!(doc.content.len(), 1);
        assert_eq!(doc.content[0].node_type, "heading");
        let inlines = doc.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(inlines[0].text.as_deref(), Some("First"));
        assert_eq!(inlines[2].text.as_deref(), Some("Second"));
    }

    #[test]
    fn issue_433_heading_consecutive_hardbreaks_roundtrip() {
        // Consecutive hardBreaks in a heading.
        let adf_json = r#"{"version":1,"type":"doc","content":[{
          "type":"heading",
          "attrs":{"level":3},
          "content":[
            {"type":"text","text":"A"},
            {"type":"hardBreak"},
            {"type":"hardBreak"},
            {"type":"text","text":"B"}
          ]
        }]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1, "Should remain a single heading");
        assert_eq!(rt.content[0].node_type, "heading");
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "hardBreak", "text"]);
    }

    #[test]
    fn issue_433_heading_with_strong_and_hardbreak_roundtrips() {
        // Heading with strong-marked text + hardBreak + plain text.
        let adf_json = r#"{"version":1,"type":"doc","content":[{
          "type":"heading",
          "attrs":{"level":1},
          "content":[
            {"type":"text","text":"Bold title","marks":[{"type":"strong"}]},
            {"type":"hardBreak"},
            {"type":"text","text":"plain continuation"}
          ]
        }]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "heading");
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(inlines[0].text.as_deref(), Some("Bold title"));
        assert_eq!(inlines[2].text.as_deref(), Some("plain continuation"));
    }

    #[test]
    fn issue_433_heading_with_link_and_hardbreak_roundtrips() {
        // Real-world pattern: heading with link + hardBreak + text.
        let adf_json = r#"{"version":1,"type":"doc","content":[{
          "type":"heading",
          "attrs":{"level":1},
          "content":[
            {"type":"text","text":"Click here","marks":[{"type":"link","attrs":{"href":"https://example.com"}}]},
            {"type":"hardBreak"},
            {"type":"text","text":"Subtitle text"}
          ]
        }]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "heading");
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(inlines[2].text.as_deref(), Some("Subtitle text"));
    }

    #[test]
    fn has_trailing_hard_break_backslash() {
        assert!(has_trailing_hard_break("text\\"));
        assert!(has_trailing_hard_break("**bold**\\"));
    }

    #[test]
    fn has_trailing_hard_break_trailing_spaces() {
        assert!(has_trailing_hard_break("text  "));
        assert!(has_trailing_hard_break("word   "));
    }

    #[test]
    fn has_trailing_hard_break_false() {
        assert!(!has_trailing_hard_break("plain text"));
        assert!(!has_trailing_hard_break("text "));
        assert!(!has_trailing_hard_break(""));
    }

    #[test]
    fn collect_hardbreak_continuations_collects_indented() {
        // A line ending with `\` followed by 2-space-indented continuation.
        // Only one line is collected because the result no longer ends with `\`.
        let input = "first\\\n  second\n  third\n";
        let mut parser = MarkdownParser::new(input);
        parser.advance(); // skip first line
        let mut text = "first\\".to_string();
        parser.collect_hardbreak_continuations(&mut text);
        assert_eq!(text, "first\\\nsecond");
    }

    #[test]
    fn collect_hardbreak_continuations_stops_at_non_indented() {
        let input = "first\\\nnot indented\n";
        let mut parser = MarkdownParser::new(input);
        parser.advance();
        let mut text = "first\\".to_string();
        parser.collect_hardbreak_continuations(&mut text);
        // Should NOT collect the non-indented line
        assert_eq!(text, "first\\");
    }

    #[test]
    fn collect_hardbreak_continuations_no_trailing_break() {
        // If the text doesn't end with a hardBreak marker, nothing is collected.
        let input = "plain\n  indented\n";
        let mut parser = MarkdownParser::new(input);
        parser.advance();
        let mut text = "plain".to_string();
        parser.collect_hardbreak_continuations(&mut text);
        assert_eq!(text, "plain");
    }

    #[test]
    fn collect_hardbreak_continuations_chained() {
        // Multiple continuation lines chained via repeated hardBreaks.
        let input = "a\\\n  b\\\n  c\\\n  d\n";
        let mut parser = MarkdownParser::new(input);
        parser.advance();
        let mut text = "a\\".to_string();
        parser.collect_hardbreak_continuations(&mut text);
        assert_eq!(text, "a\\\nb\\\nc\\\nd");
    }

    #[test]
    fn collect_hardbreak_continuations_stops_before_image_line() {
        // An indented continuation that starts with `![` (mediaSingle syntax)
        // must NOT be swallowed as a paragraph continuation (issue #490).
        let input = "text\\\n  ![](url){type=file id=x}\n";
        let mut parser = MarkdownParser::new(input);
        parser.advance(); // skip first line
        let mut text = "text\\".to_string();
        parser.collect_hardbreak_continuations(&mut text);
        // The image line should NOT have been consumed.
        assert_eq!(text, "text\\");
        // Parser should still be on the image line (not past it).
        assert!(!parser.at_end());
        assert!(parser.current_line().contains("![](url)"));
    }

    #[test]
    fn is_block_level_continuation_marker_positive_cases() {
        // Each marker that forces `collect_hardbreak_continuations` to stop.
        assert!(is_block_level_continuation_marker("![](url)"));
        assert!(is_block_level_continuation_marker("```ruby"));
        assert!(is_block_level_continuation_marker(":::panel{type=info}"));
    }

    #[test]
    fn is_block_level_continuation_marker_negative_cases() {
        // Plain continuation text must NOT look like a block-level marker.
        assert!(!is_block_level_continuation_marker("plain text"));
        assert!(!is_block_level_continuation_marker("- nested item"));
        assert!(!is_block_level_continuation_marker("continuation\\"));
        assert!(!is_block_level_continuation_marker(""));
        // Double-colon `::` is not a container directive.
        assert!(!is_block_level_continuation_marker("::partial"));
        // Single backticks are inline code, not a fence.
        assert!(!is_block_level_continuation_marker("`inline`"));
    }

    #[test]
    fn collect_hardbreak_continuations_stops_before_code_fence() {
        // Issue #552: An indented continuation that opens a fenced code block
        // must NOT be swallowed as a paragraph continuation — it has to stay
        // available for `try_code_block` on the next parse iteration.
        let input = "text\\\n  ```ruby\n  Foo::Bar::Baz\n  ```\n";
        let mut parser = MarkdownParser::new(input);
        parser.advance();
        let mut text = "text\\".to_string();
        parser.collect_hardbreak_continuations(&mut text);
        assert_eq!(text, "text\\");
        assert!(!parser.at_end());
        assert!(parser.current_line().starts_with("  ```"));
    }

    #[test]
    fn collect_hardbreak_continuations_stops_before_container_directive() {
        // Issue #552: An indented continuation that opens a `:::` container
        // directive (panel, expand, etc.) must also stay available for the
        // directive parser.
        let input = "text\\\n  :::panel{type=info}\n  body\n  :::\n";
        let mut parser = MarkdownParser::new(input);
        parser.advance();
        let mut text = "text\\".to_string();
        parser.collect_hardbreak_continuations(&mut text);
        assert_eq!(text, "text\\");
        assert!(!parser.at_end());
        assert!(parser.current_line().contains(":::panel"));
    }

    #[test]
    fn collect_hardbreak_continuations_stops_before_indented_code_fence() {
        // Variant: extra leading whitespace on the code-fence line (so the
        // stripped tail is `  ```` rather than a bare ` ``` `) must still be
        // recognised by the `trim_start().starts_with("```")` check.
        let input = "text\\\n     ```text\n     :fire:\n     ```\n";
        let mut parser = MarkdownParser::new(input);
        parser.advance();
        let mut text = "text\\".to_string();
        parser.collect_hardbreak_continuations(&mut text);
        assert_eq!(text, "text\\");
        assert!(!parser.at_end());
        assert!(parser.current_line().contains("```text"));
    }

    #[test]
    fn ordered_list_with_sub_content_after_hardbreak() {
        // Exercises the sub-content collection loop in parse_ordered_list
        // (lines 339-347) with a hardBreak item that also has a nested list.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"orderedList","attrs":{"order":1},"content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"parent"},
                {"type":"hardBreak"},
                {"type":"text","text":"continued"}
              ]},
              {"type":"bulletList","content":[
                {"type":"listItem","content":[
                  {"type":"paragraph","content":[
                    {"type":"text","text":"child"}
                  ]}
                ]}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "orderedList");
        let item_content = rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        // Paragraph with hardBreak
        let p = item_content[0].content.as_ref().unwrap();
        let types: Vec<&str> = p.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(p[0].text.as_deref(), Some("parent"));
        assert_eq!(p[2].text.as_deref(), Some("continued"));
        // Nested bullet list
        assert_eq!(item_content[1].node_type, "bulletList");
    }

    #[test]
    fn render_list_item_content_no_content() {
        // A listItem with content: None should produce just a newline.
        let item = AdfNode {
            node_type: "listItem".to_string(),
            attrs: None,
            content: None,
            text: None,
            marks: None,
            local_id: None,
            parameters: None,
        };
        let mut output = String::new();
        let opts = RenderOptions::default();
        render_list_item_content(&item, &mut output, &opts);
        assert_eq!(output, "\n");
    }

    #[test]
    fn render_list_item_content_empty_content() {
        // A listItem with content: Some(vec![]) should produce just a newline.
        let item = AdfNode::list_item(vec![]);
        let mut output = String::new();
        let opts = RenderOptions::default();
        render_list_item_content(&item, &mut output, &opts);
        assert_eq!(output, "\n");
    }

    #[test]
    fn plus_bullet_paragraph_roundtrips() {
        // Paragraph starting with "+ " must round-trip without becoming
        // a bullet list.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"paragraph","content":[
            {"type":"text","text":"+ plus"}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        assert_eq!(rt.content[0].node_type, "paragraph");
        assert_eq!(
            rt.content[0].content.as_ref().unwrap()[0]
                .text
                .as_deref()
                .unwrap(),
            "+ plus"
        );
    }

    // ---- Issue #430 tests: mediaSingle inside listItem ----

    #[test]
    fn issue_430_file_media_in_bullet_list_roundtrip() {
        // Issue #430: mediaSingle (type:file) as direct child of listItem
        // in a bulletList must survive round-trip.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[{
            "type":"mediaSingle",
            "attrs":{"layout":"center","width":1009,"widthType":"pixel"},
            "content":[{
              "type":"media",
              "attrs":{"collection":"contentId-123","height":576,"id":"00066e8e-554e-4d7e-af59-a0ef2888bdb6","type":"file","width":1009}
            }]
          }]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let list = &rt.content[0];
        assert_eq!(list.node_type, "bulletList");
        let item = &list.content.as_ref().unwrap()[0];
        assert_eq!(item.node_type, "listItem");
        let ms = &item.content.as_ref().unwrap()[0];
        assert_eq!(ms.node_type, "mediaSingle");
        let ms_attrs = ms.attrs.as_ref().unwrap();
        assert_eq!(ms_attrs["layout"], "center");
        assert_eq!(ms_attrs["width"], 1009);
        assert_eq!(ms_attrs["widthType"], "pixel");
        let media = &ms.content.as_ref().unwrap()[0];
        assert_eq!(media.node_type, "media");
        let m_attrs = media.attrs.as_ref().unwrap();
        assert_eq!(m_attrs["type"], "file");
        assert_eq!(m_attrs["id"], "00066e8e-554e-4d7e-af59-a0ef2888bdb6");
        assert_eq!(m_attrs["collection"], "contentId-123");
        assert_eq!(m_attrs["height"], 576);
        assert_eq!(m_attrs["width"], 1009);
    }

    #[test]
    fn issue_430_file_media_in_ordered_list_roundtrip() {
        // Same as above but inside an orderedList.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[
          {"type":"listItem","content":[{
            "type":"mediaSingle",
            "attrs":{"layout":"center"},
            "content":[{
              "type":"media",
              "attrs":{"type":"file","id":"abc-123","collection":"contentId-456","height":100,"width":200}
            }]
          }]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let list = &rt.content[0];
        assert_eq!(list.node_type, "orderedList");
        let item = &list.content.as_ref().unwrap()[0];
        assert_eq!(item.node_type, "listItem");
        let ms = &item.content.as_ref().unwrap()[0];
        assert_eq!(ms.node_type, "mediaSingle");
        let media = &ms.content.as_ref().unwrap()[0];
        assert_eq!(media.node_type, "media");
        let m_attrs = media.attrs.as_ref().unwrap();
        assert_eq!(m_attrs["type"], "file");
        assert_eq!(m_attrs["id"], "abc-123");
        assert_eq!(m_attrs["collection"], "contentId-456");
    }

    #[test]
    fn issue_430_external_media_in_bullet_list_roundtrip() {
        // External image (type:external) inside a bullet list item.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[{
            "type":"mediaSingle",
            "attrs":{"layout":"center"},
            "content":[{
              "type":"media",
              "attrs":{"type":"external","url":"https://example.com/img.png","alt":"Photo"}
            }]
          }]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let list = &rt.content[0];
        assert_eq!(list.node_type, "bulletList");
        let item = &list.content.as_ref().unwrap()[0];
        let ms = &item.content.as_ref().unwrap()[0];
        assert_eq!(ms.node_type, "mediaSingle");
        let media = &ms.content.as_ref().unwrap()[0];
        assert_eq!(media.node_type, "media");
        let m_attrs = media.attrs.as_ref().unwrap();
        assert_eq!(m_attrs["type"], "external");
        assert_eq!(m_attrs["url"], "https://example.com/img.png");
    }

    #[test]
    fn issue_430_media_with_paragraph_siblings_in_list_item() {
        // listItem containing a paragraph followed by a mediaSingle.
        // Both children must survive round-trip.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[
            {"type":"paragraph","content":[{"type":"text","text":"Caption:"}]},
            {"type":"mediaSingle","attrs":{"layout":"center"},
             "content":[{"type":"media","attrs":{"type":"file","id":"img-001","collection":"col-1","height":50,"width":100}}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let children = item.content.as_ref().unwrap();
        assert_eq!(children.len(), 2, "expected 2 children in listItem");
        assert_eq!(children[0].node_type, "paragraph");
        assert_eq!(children[1].node_type, "mediaSingle");
        let media = &children[1].content.as_ref().unwrap()[0];
        assert_eq!(media.attrs.as_ref().unwrap()["id"], "img-001");
    }

    #[test]
    fn issue_430_multiple_media_in_list_items() {
        // Multiple list items each containing mediaSingle.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[{
            "type":"mediaSingle","attrs":{"layout":"center"},
            "content":[{"type":"media","attrs":{"type":"file","id":"img-a","collection":"c1","height":10,"width":20}}]
          }]},
          {"type":"listItem","content":[{
            "type":"mediaSingle","attrs":{"layout":"center"},
            "content":[{"type":"media","attrs":{"type":"file","id":"img-b","collection":"c2","height":30,"width":40}}]
          }]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);
        for (i, expected_id) in [("img-a", "c1"), ("img-b", "c2")].iter().enumerate() {
            let ms = &items[i].content.as_ref().unwrap()[0];
            assert_eq!(ms.node_type, "mediaSingle");
            let m_attrs = ms.content.as_ref().unwrap()[0].attrs.as_ref().unwrap();
            assert_eq!(m_attrs["id"], expected_id.0);
            assert_eq!(m_attrs["collection"], expected_id.1);
        }
    }

    #[test]
    fn issue_430_jfm_to_adf_media_in_bullet_item() {
        // Parse JFM directly: image syntax on the first line of a bullet item
        // must produce mediaSingle, not a paragraph with corrupted text.
        let md = "- ![](){type=file id=test-id collection=col-1 height=100 width=200}\n";
        let doc = markdown_to_adf(md).unwrap();

        let list = &doc.content[0];
        assert_eq!(list.node_type, "bulletList");
        let item = &list.content.as_ref().unwrap()[0];
        let ms = &item.content.as_ref().unwrap()[0];
        assert_eq!(
            ms.node_type, "mediaSingle",
            "expected mediaSingle, got {}",
            ms.node_type
        );
        let media = &ms.content.as_ref().unwrap()[0];
        assert_eq!(media.node_type, "media");
        let m_attrs = media.attrs.as_ref().unwrap();
        assert_eq!(m_attrs["type"], "file");
        assert_eq!(m_attrs["id"], "test-id");
    }

    #[test]
    fn issue_430_jfm_to_adf_media_in_ordered_item() {
        // Parse JFM directly: image syntax on the first line of an ordered list item.
        let md = "1. ![alt text](https://example.com/photo.jpg)\n";
        let doc = markdown_to_adf(md).unwrap();

        let list = &doc.content[0];
        assert_eq!(list.node_type, "orderedList");
        let item = &list.content.as_ref().unwrap()[0];
        let ms = &item.content.as_ref().unwrap()[0];
        assert_eq!(
            ms.node_type, "mediaSingle",
            "expected mediaSingle, got {}",
            ms.node_type
        );
    }

    #[test]
    fn issue_430_media_then_paragraph_in_bullet_list_roundtrip() {
        // listItem with mediaSingle as first child followed by a paragraph.
        // Exercises the sub_lines non-empty path when first_node is mediaSingle.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[
            {"type":"mediaSingle","attrs":{"layout":"center"},
             "content":[{"type":"media","attrs":{"type":"file","id":"img-first","collection":"col-1","height":50,"width":100}}]},
            {"type":"paragraph","content":[{"type":"text","text":"Caption below"}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let children = item.content.as_ref().unwrap();
        assert_eq!(children.len(), 2, "expected 2 children in listItem");
        assert_eq!(children[0].node_type, "mediaSingle");
        let media = &children[0].content.as_ref().unwrap()[0];
        assert_eq!(media.attrs.as_ref().unwrap()["id"], "img-first");
        assert_eq!(children[1].node_type, "paragraph");
    }

    #[test]
    fn issue_430_media_then_paragraph_in_ordered_list_roundtrip() {
        // Same as above but for ordered lists.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[
          {"type":"listItem","content":[
            {"type":"mediaSingle","attrs":{"layout":"center"},
             "content":[{"type":"media","attrs":{"type":"file","id":"img-ord","collection":"col-2","height":60,"width":120}}]},
            {"type":"paragraph","content":[{"type":"text","text":"Description"}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let children = item.content.as_ref().unwrap();
        assert_eq!(children.len(), 2, "expected 2 children in listItem");
        assert_eq!(children[0].node_type, "mediaSingle");
        assert_eq!(children[1].node_type, "paragraph");
    }

    #[test]
    fn issue_430_external_media_with_width_type_roundtrip() {
        // External image with widthType attr must survive round-trip.
        let adf_json = r#"{"version":1,"type":"doc","content":[{
          "type":"mediaSingle",
          "attrs":{"layout":"wide","width":800,"widthType":"pixel"},
          "content":[{
            "type":"media",
            "attrs":{"type":"external","url":"https://example.com/photo.png","alt":"wide photo"}
          }]
        }]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("widthType=pixel"),
            "expected widthType=pixel in markdown, got: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let ms = &rt.content[0];
        assert_eq!(ms.node_type, "mediaSingle");
        let ms_attrs = ms.attrs.as_ref().unwrap();
        assert_eq!(ms_attrs["widthType"], "pixel");
        assert_eq!(ms_attrs["width"], 800);
        assert_eq!(ms_attrs["layout"], "wide");
    }

    // ── Issue #490: mediaSingle after hardBreak in listItem ─────

    #[test]
    fn issue_490_paragraph_with_hardbreak_then_media_single_roundtrip() {
        // Reproducer from issue #490: paragraph with trailing hardBreak
        // followed by mediaSingle inside a listItem.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[
            {"type":"paragraph","content":[
              {"type":"text","text":"Item with image:"},
              {"type":"hardBreak"}
            ]},
            {"type":"mediaSingle","attrs":{"layout":"center","width":400,"widthType":"pixel"},
             "content":[{"type":"media","attrs":{
               "id":"aabbccdd-1234-5678-abcd-aabbccdd1234",
               "type":"file",
               "collection":"contentId-123456",
               "width":800,
               "height":600
             }}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let children = item.content.as_ref().unwrap();
        assert_eq!(children.len(), 2, "expected 2 children in listItem");
        assert_eq!(children[0].node_type, "paragraph");
        assert_eq!(
            children[1].node_type, "mediaSingle",
            "expected mediaSingle, got {:?}",
            children[1].node_type
        );
        let media = &children[1].content.as_ref().unwrap()[0];
        let m_attrs = media.attrs.as_ref().unwrap();
        assert_eq!(m_attrs["id"], "aabbccdd-1234-5678-abcd-aabbccdd1234");
        assert_eq!(m_attrs["collection"], "contentId-123456");
        assert_eq!(m_attrs["height"], 600);
        assert_eq!(m_attrs["width"], 800);
    }

    #[test]
    fn issue_490_paragraph_with_hardbreak_then_media_single_ordered_list() {
        // Same scenario but in an ordered list.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[
          {"type":"listItem","content":[
            {"type":"paragraph","content":[
              {"type":"text","text":"Step with screenshot:"},
              {"type":"hardBreak"}
            ]},
            {"type":"mediaSingle","attrs":{"layout":"center"},
             "content":[{"type":"media","attrs":{
               "id":"ord-media-id","type":"file","collection":"col-ord","width":640,"height":480
             }}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let children = item.content.as_ref().unwrap();
        assert_eq!(children.len(), 2, "expected 2 children in listItem");
        assert_eq!(children[0].node_type, "paragraph");
        assert_eq!(children[1].node_type, "mediaSingle");
        let media = &children[1].content.as_ref().unwrap()[0];
        assert_eq!(media.attrs.as_ref().unwrap()["id"], "ord-media-id");
    }

    #[test]
    fn issue_490_hardbreak_continuation_does_not_swallow_media_line() {
        // Directly tests that collect_hardbreak_continuations stops before
        // an indented mediaSingle line.
        let md = "- Item with image:\\\n  ![](){type=file id=test-490 collection=col height=100 width=200}\n";
        let doc = markdown_to_adf(md).unwrap();

        let item = &doc.content[0].content.as_ref().unwrap()[0];
        let children = item.content.as_ref().unwrap();
        assert_eq!(children.len(), 2, "expected 2 children in listItem");
        assert_eq!(children[0].node_type, "paragraph");
        assert_eq!(
            children[1].node_type, "mediaSingle",
            "expected mediaSingle as second child, got {:?}",
            children[1].node_type
        );
        let media = &children[1].content.as_ref().unwrap()[0];
        assert_eq!(media.attrs.as_ref().unwrap()["id"], "test-490");
    }

    #[test]
    fn issue_490_hardbreak_continuation_still_works_for_text() {
        // Ensure regular hardBreak continuations still work after the fix.
        let md = "- first line\\\n  second line\n";
        let doc = markdown_to_adf(md).unwrap();

        let item = &doc.content[0].content.as_ref().unwrap()[0];
        let children = item.content.as_ref().unwrap();
        assert_eq!(
            children.len(),
            1,
            "expected 1 child (paragraph) in listItem"
        );
        assert_eq!(children[0].node_type, "paragraph");
        let inlines = children[0].content.as_ref().unwrap();
        // Should contain: text("first line"), hardBreak, text("second line")
        assert_eq!(inlines.len(), 3);
        assert_eq!(inlines[0].node_type, "text");
        assert_eq!(inlines[1].node_type, "hardBreak");
        assert_eq!(inlines[2].node_type, "text");
    }

    #[test]
    fn issue_490_external_media_after_hardbreak_roundtrip() {
        // External image (URL-based) after a paragraph with hardBreak.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[
            {"type":"paragraph","content":[
              {"type":"text","text":"See image:"},
              {"type":"hardBreak"}
            ]},
            {"type":"mediaSingle","attrs":{"layout":"center"},
             "content":[{"type":"media","attrs":{
               "type":"external","url":"https://example.com/photo.png","alt":"photo"
             }}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let children = item.content.as_ref().unwrap();
        assert_eq!(children.len(), 2);
        assert_eq!(children[0].node_type, "paragraph");
        assert_eq!(children[1].node_type, "mediaSingle");
        let media = &children[1].content.as_ref().unwrap()[0];
        let m_attrs = media.attrs.as_ref().unwrap();
        assert_eq!(m_attrs["url"], "https://example.com/photo.png");
    }

    #[test]
    fn issue_490_multiple_hardbreaks_then_media_single() {
        // Paragraph with multiple hardBreaks, then mediaSingle.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[
            {"type":"paragraph","content":[
              {"type":"text","text":"line one"},
              {"type":"hardBreak"},
              {"type":"text","text":"line two"},
              {"type":"hardBreak"}
            ]},
            {"type":"mediaSingle","attrs":{"layout":"center"},
             "content":[{"type":"media","attrs":{
               "type":"file","id":"multi-hb","collection":"col-m","width":320,"height":240
             }}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let children = item.content.as_ref().unwrap();
        assert_eq!(children.len(), 2, "expected paragraph + mediaSingle");
        assert_eq!(children[0].node_type, "paragraph");
        assert_eq!(children[1].node_type, "mediaSingle");
        let media = &children[1].content.as_ref().unwrap()[0];
        assert_eq!(media.attrs.as_ref().unwrap()["id"], "multi-hb");
    }

    // ── Issue #525: listItem localId dropped when content includes mediaSingle ──

    #[test]
    fn issue_525_listitem_localid_with_mediasingle_roundtrip() {
        // Exact reproducer from issue #525: listItem with UUID localId whose
        // content includes mediaSingle + paragraph + nested bulletList.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","attrs":{"localId":"aabbccdd-1234-5678-abcd-000000000001"},"content":[{"type":"mediaSingle","attrs":{"layout":"center","width":100,"widthType":"pixel"},"content":[{"type":"media","attrs":{"id":"aabbccdd-1234-5678-abcd-000000000002","type":"file","collection":"test-collection","height":100,"width":100}}]},{"type":"paragraph","content":[{"type":"text","text":"some text"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"nested item"}]}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let list = &rt.content[0];
        assert_eq!(list.node_type, "bulletList");
        let item = &list.content.as_ref().unwrap()[0];
        // The localId must be preserved on the listItem.
        let item_attrs = item.attrs.as_ref().expect("listItem attrs must be present");
        assert_eq!(
            item_attrs["localId"], "aabbccdd-1234-5678-abcd-000000000001",
            "listItem localId must survive round-trip"
        );
        let children = item.content.as_ref().unwrap();
        assert_eq!(
            children.len(),
            3,
            "expected mediaSingle + paragraph + bulletList"
        );
        assert_eq!(children[0].node_type, "mediaSingle");
        assert_eq!(children[1].node_type, "paragraph");
        assert_eq!(children[2].node_type, "bulletList");
    }

    #[test]
    fn issue_525_listitem_localid_with_mediasingle_only() {
        // Minimal case: listItem with localId whose sole child is mediaSingle.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","attrs":{"localId":"li-media-only"},"content":[
            {"type":"mediaSingle","attrs":{"layout":"center"},
             "content":[{"type":"media","attrs":{"type":"file","id":"m-001","collection":"c1","height":50,"width":100}}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let item_attrs = item.attrs.as_ref().expect("listItem attrs must be present");
        assert_eq!(
            item_attrs["localId"], "li-media-only",
            "listItem localId must survive when sole child is mediaSingle"
        );
        assert_eq!(item.content.as_ref().unwrap()[0].node_type, "mediaSingle");
    }

    #[test]
    fn issue_525_listitem_localid_with_external_media() {
        // External image (URL-based) as first child with listItem localId.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","attrs":{"localId":"li-ext-media"},"content":[
            {"type":"mediaSingle","attrs":{"layout":"center"},
             "content":[{"type":"media","attrs":{"type":"external","url":"https://example.com/img.png","alt":"photo"}}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let item_attrs = item.attrs.as_ref().expect("listItem attrs must be present");
        assert_eq!(
            item_attrs["localId"], "li-ext-media",
            "listItem localId must survive with external mediaSingle"
        );
    }

    #[test]
    fn issue_525_listitem_localid_with_mediasingle_in_ordered_list() {
        // Same bug in an ordered list.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[
          {"type":"listItem","attrs":{"localId":"li-ord-media"},"content":[
            {"type":"mediaSingle","attrs":{"layout":"center","width":200,"widthType":"pixel"},
             "content":[{"type":"media","attrs":{"type":"file","id":"ord-m-001","collection":"col-ord","height":80,"width":160}}]},
            {"type":"paragraph","content":[{"type":"text","text":"ordered item text"}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let item = &rt.content[0].content.as_ref().unwrap()[0];
        let item_attrs = item.attrs.as_ref().expect("listItem attrs must be present");
        assert_eq!(
            item_attrs["localId"], "li-ord-media",
            "listItem localId must survive in ordered list with mediaSingle"
        );
        let children = item.content.as_ref().unwrap();
        assert_eq!(children[0].node_type, "mediaSingle");
        assert_eq!(children[1].node_type, "paragraph");
    }

    #[test]
    fn issue_525_jfm_localid_on_mediasingle_line_parses_correctly() {
        // Verify JFM→ADF: trailing {localId=...} on a mediaSingle line
        // is assigned to the listItem, not the media node.
        let md = "- ![](){type=file id=test-525 collection=col height=100 width=200 mediaWidth=100 widthType=pixel} {localId=li-jfm-525}\n";
        let doc = markdown_to_adf(md).unwrap();

        let item = &doc.content[0].content.as_ref().unwrap()[0];
        let item_attrs = item
            .attrs
            .as_ref()
            .expect("listItem attrs must be present from JFM");
        assert_eq!(item_attrs["localId"], "li-jfm-525");
        assert_eq!(item.content.as_ref().unwrap()[0].node_type, "mediaSingle");
    }

    #[test]
    fn issue_525_encoding_emits_localid_on_mediasingle_line() {
        // Verify the ADF→JFM encoding: localId appears on the same line
        // as the mediaSingle image syntax.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","attrs":{"localId":"li-emit-check"},"content":[
            {"type":"mediaSingle","attrs":{"layout":"center"},
             "content":[{"type":"media","attrs":{"type":"file","id":"m-emit","collection":"c-emit","height":10,"width":20}}]}
          ]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("{localId=li-emit-check}"),
            "expected localId in JFM output, got: {md}"
        );
        // The localId must be on the same line as the image
        for line in md.lines() {
            if line.contains("![") {
                assert!(
                    line.contains("localId=li-emit-check"),
                    "localId must be on the same line as the image: {line}"
                );
            }
        }
    }

    // ── Placeholder node tests ────────────────────────────────────

    #[test]
    fn adf_placeholder_to_markdown() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::placeholder(
                "Type something here",
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(":placeholder[Type something here]"),
            "expected :placeholder directive, got: {md}"
        );
    }

    #[test]
    fn markdown_placeholder_to_adf() {
        let doc = markdown_to_adf("Before :placeholder[Enter name] after").unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content[1].node_type, "placeholder");
        let attrs = content[1].attrs.as_ref().unwrap();
        assert_eq!(attrs["text"], "Enter name");
    }

    #[test]
    fn placeholder_round_trip() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"placeholder","attrs":{"text":"Type something here"}}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content.len(), 1);
        assert_eq!(content[0].node_type, "placeholder");
        let attrs = content[0].attrs.as_ref().unwrap();
        assert_eq!(attrs["text"], "Type something here");
    }

    #[test]
    fn placeholder_empty_text() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::placeholder("")])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(":placeholder[]"),
            "expected empty placeholder directive, got: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let content = rt.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].node_type, "placeholder");
        assert_eq!(content[0].attrs.as_ref().unwrap()["text"], "");
    }

    #[test]
    fn placeholder_with_surrounding_text() {
        let md = "Click :placeholder[here] to continue\n";
        let doc = markdown_to_adf(md).unwrap();
        let content = doc.content[0].content.as_ref().unwrap();
        assert_eq!(content[0].text.as_deref(), Some("Click "));
        assert_eq!(content[1].node_type, "placeholder");
        assert_eq!(content[1].attrs.as_ref().unwrap()["text"], "here");
        assert_eq!(content[2].text.as_deref(), Some(" to continue"));
    }

    #[test]
    fn placeholder_missing_attrs() {
        // Placeholder node with no attrs should not panic
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode {
                node_type: "placeholder".to_string(),
                attrs: None,
                content: None,
                text: None,
                marks: None,
                local_id: None,
                parameters: None,
            }])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        // With no attrs, nothing is emitted for the placeholder
        assert!(!md.contains("placeholder"));
    }

    // Issue #446: mention in table+list loses id and misplaces localId
    #[test]
    fn mention_in_table_bullet_list_preserves_id_and_local_id() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"table","content":[{"type":"tableRow","content":[{"type":"tableCell","attrs":{"colspan":1,"colwidth":[200],"rowspan":1},"content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"prefix text "},{"type":"mention","attrs":{"id":"aabbccdd11223344aabbccdd","localId":"aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee","text":"@Alice Example"}},{"type":"text","text":" "}]}]}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        // Navigate: doc → table → tableRow → tableCell → bulletList → listItem → paragraph
        let cell = &rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap()[0];
        let list = &cell.content.as_ref().unwrap()[0];
        let list_item = &list.content.as_ref().unwrap()[0];

        // listItem must NOT have a localId attribute
        assert!(
            list_item
                .attrs
                .as_ref()
                .and_then(|a| a.get("localId"))
                .is_none(),
            "localId should stay on the mention, not the listItem"
        );

        let para = &list_item.content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();

        // Should have: text("prefix text "), mention, text(" ")
        assert_eq!(inlines.len(), 3, "expected 3 inline nodes, got {inlines:?}");

        assert_eq!(inlines[0].node_type, "text");
        assert_eq!(inlines[0].text.as_deref(), Some("prefix text "));

        assert_eq!(inlines[1].node_type, "mention");
        let mention_attrs = inlines[1].attrs.as_ref().unwrap();
        assert_eq!(
            mention_attrs["id"], "aabbccdd11223344aabbccdd",
            "mention id must be preserved"
        );
        assert_eq!(
            mention_attrs["localId"], "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
            "mention localId must be preserved"
        );
        assert_eq!(mention_attrs["text"], "@Alice Example");

        assert_eq!(inlines[2].node_type, "text");
        assert_eq!(inlines[2].text.as_deref(), Some(" "));
    }

    #[test]
    fn mention_in_bullet_list_preserves_id_and_local_id() {
        // Same bug outside of a table context
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"mention","attrs":{"id":"user123","localId":"11111111-2222-3333-4444-555555555555","text":"@Bob"}},{"type":"text","text":" "}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let list_item = &rt.content[0].content.as_ref().unwrap()[0];
        assert!(
            list_item
                .attrs
                .as_ref()
                .and_then(|a| a.get("localId"))
                .is_none(),
            "localId should stay on the mention, not the listItem"
        );

        let para = &list_item.content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        assert_eq!(inlines[0].node_type, "mention");
        let mention_attrs = inlines[0].attrs.as_ref().unwrap();
        assert_eq!(mention_attrs["id"], "user123");
        assert_eq!(
            mention_attrs["localId"],
            "11111111-2222-3333-4444-555555555555"
        );
    }

    #[test]
    fn mention_in_ordered_list_preserves_id_and_local_id() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"see "},{"type":"mention","attrs":{"id":"xyz","localId":"aaaa-bbbb","text":"@Carol"}}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let list_item = &rt.content[0].content.as_ref().unwrap()[0];
        assert!(
            list_item
                .attrs
                .as_ref()
                .and_then(|a| a.get("localId"))
                .is_none(),
            "localId should stay on the mention, not the listItem"
        );

        let para = &list_item.content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        assert_eq!(inlines[1].node_type, "mention");
        let mention_attrs = inlines[1].attrs.as_ref().unwrap();
        assert_eq!(mention_attrs["id"], "xyz");
        assert_eq!(mention_attrs["localId"], "aaaa-bbbb");
    }

    #[test]
    fn list_item_own_local_id_with_mention_both_preserved() {
        // When a listItem has its own localId AND contains a mention with localId,
        // both should be preserved independently.
        let md = "- hello :mention[@Eve]{id=e1 localId=mention-lid} {localId=item-lid}\n";
        let doc = markdown_to_adf(md).unwrap();
        let list_item = &doc.content[0].content.as_ref().unwrap()[0];

        // listItem should have its own localId
        let item_attrs = list_item.attrs.as_ref().unwrap();
        assert_eq!(item_attrs["localId"], "item-lid");

        // mention should have its own localId
        let para = &list_item.content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        let mention = inlines.iter().find(|n| n.node_type == "mention").unwrap();
        let mention_attrs = mention.attrs.as_ref().unwrap();
        assert_eq!(mention_attrs["id"], "e1");
        assert_eq!(mention_attrs["localId"], "mention-lid");
    }

    #[test]
    fn extract_trailing_local_id_ignores_directive_attrs() {
        // Directly test the helper: a line ending with a directive's {…}
        // should NOT be treated as a trailing localId.
        let line = "text :mention[@X]{id=abc localId=uuid}";
        let (text, lid, plid) = extract_trailing_local_id(line);
        assert_eq!(text, line, "text should be unchanged");
        assert!(
            lid.is_none(),
            "should not extract localId from directive attrs"
        );
        assert!(plid.is_none());
    }

    #[test]
    fn extract_trailing_local_id_matches_standalone_block() {
        // A standalone trailing {localId=…} separated by whitespace should still work.
        let line = "some text {localId=abc-123}";
        let (text, lid, plid) = extract_trailing_local_id(line);
        assert_eq!(text, "some text");
        assert_eq!(lid.as_deref(), Some("abc-123"));
        assert!(plid.is_none());
    }

    // --- Issue #454: literal newline in text node inside listItem paragraph ---

    #[test]
    fn newline_in_text_node_roundtrips_in_bullet_list() {
        // A text node containing a literal \n inside a bullet list item
        // must round-trip as a single text node with the embedded newline
        // preserved, not split into multiple paragraphs or hardBreak nodes.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"Run these commands:"},{"type":"hardBreak"},{"type":"text","text":"first command\nsecond command"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        // Should still be a single bulletList with one listItem
        assert_eq!(rt.content.len(), 1);
        let list = &rt.content[0];
        assert_eq!(list.node_type, "bulletList");
        let items = list.content.as_ref().unwrap();
        assert_eq!(items.len(), 1);

        // The listItem should have exactly one paragraph child
        let item_content = items[0].content.as_ref().unwrap();
        assert_eq!(
            item_content.len(),
            1,
            "listItem should have exactly one paragraph"
        );
        assert_eq!(item_content[0].node_type, "paragraph");

        // The embedded newline must survive as a single text node
        let inlines = item_content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "text"],
            "embedded newline should stay in a single text node, not produce extra hardBreaks"
        );
        assert_eq!(
            inlines[2].text.as_deref(),
            Some("first command\nsecond command")
        );
    }

    #[test]
    fn newline_in_text_node_roundtrips_in_ordered_list() {
        // Same as above but in an ordered list.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","attrs":{"order":1},"content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"first\nsecond"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let list = &rt.content[0];
        assert_eq!(list.node_type, "orderedList");
        let items = list.content.as_ref().unwrap();
        assert_eq!(items.len(), 1);

        let item_content = items[0].content.as_ref().unwrap();
        assert_eq!(item_content.len(), 1);
        assert_eq!(item_content[0].node_type, "paragraph");

        let inlines = item_content[0].content.as_ref().unwrap();
        assert_eq!(inlines.len(), 1);
        assert_eq!(inlines[0].node_type, "text");
        assert_eq!(inlines[0].text.as_deref(), Some("first\nsecond"));
    }

    #[test]
    fn newline_in_text_node_roundtrips_in_paragraph() {
        // A text node with \n in a top-level paragraph should render as
        // escaped \n and round-trip back to a single text node.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"hello\nworld"}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("hello\\nworld"),
            "newline in text node should render as escaped \\n: {md:?}"
        );

        let rt = markdown_to_adf(&md).unwrap();
        let inlines = rt.content[0].content.as_ref().unwrap();
        assert_eq!(inlines.len(), 1);
        assert_eq!(inlines[0].text.as_deref(), Some("hello\nworld"));
    }

    #[test]
    fn multiple_newlines_in_text_node_roundtrip() {
        // Multiple \n characters should each round-trip within the same text node.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"a\nb\nc"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let item_content = rt.content[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        assert_eq!(item_content.len(), 1);

        let inlines = item_content[0].content.as_ref().unwrap();
        assert_eq!(inlines.len(), 1);
        assert_eq!(inlines[0].text.as_deref(), Some("a\nb\nc"));
    }

    #[test]
    fn newline_in_marked_text_node_roundtrips() {
        // A bold text node with \n should round-trip preserving both
        // the marks and the embedded newline.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"bold\ntext","marks":[{"type":"strong"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("**bold\\ntext**"),
            "bold text with embedded newline should stay in one marked run: {md:?}"
        );

        let rt = markdown_to_adf(&md).unwrap();
        let inlines = rt.content[0].content.as_ref().unwrap();
        assert_eq!(inlines.len(), 1);
        assert_eq!(inlines[0].text.as_deref(), Some("bold\ntext"));
        assert!(inlines[0]
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .any(|m| m.mark_type == "strong"));
    }

    #[test]
    fn trailing_newline_in_text_node_roundtrips() {
        // A text node ending with \n should round-trip preserving the
        // trailing newline.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"trailing\n"}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("trailing\\n"),
            "trailing newline should be escaped: {md:?}"
        );

        let rt = markdown_to_adf(&md).unwrap();
        let inlines = rt.content[0].content.as_ref().unwrap();
        assert_eq!(inlines.len(), 1);
        assert_eq!(inlines[0].text.as_deref(), Some("trailing\n"));
    }

    #[test]
    fn hardbreak_and_embedded_newline_are_distinct() {
        // A hardBreak node and an embedded \n in a text node must not be
        // conflated — each must round-trip to its original form.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"before"},{"type":"hardBreak"},{"type":"text","text":"mid\ndle"},{"type":"hardBreak"},{"type":"text","text":"after"}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "text", "hardBreak", "text"]
        );
        assert_eq!(inlines[0].text.as_deref(), Some("before"));
        assert_eq!(inlines[2].text.as_deref(), Some("mid\ndle"));
        assert_eq!(inlines[4].text.as_deref(), Some("after"));
    }

    // ---- Issue #472 tests ----

    #[test]
    fn issue_472_bullet_list_trailing_hardbreak_roundtrips() {
        // Issue #472: trailing hardBreak at end of listItem paragraph must
        // not split the parent bulletList on round-trip.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"bulletList","content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"First item"},
                {"type":"hardBreak"}
              ]}
            ]},
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Second item"}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        // Must remain a single bulletList
        assert_eq!(
            rt.content.len(),
            1,
            "Should be 1 block (bulletList), got {}",
            rt.content.len()
        );
        assert_eq!(rt.content[0].node_type, "bulletList");
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            items.len(),
            2,
            "Should have 2 listItems, got {}",
            items.len()
        );

        // First item: text + hardBreak (trailing)
        let p1 = items[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let types1: Vec<&str> = p1.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types1, vec!["text", "hardBreak"]);
        assert_eq!(p1[0].text.as_deref(), Some("First item"));

        // Second item: text only
        let p2 = items[1].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        assert_eq!(p2[0].text.as_deref(), Some("Second item"));
    }

    #[test]
    fn issue_472_ordered_list_trailing_hardbreak_roundtrips() {
        // Ordered list variant of issue #472.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"orderedList","attrs":{"order":1},"content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Alpha"},
                {"type":"hardBreak"}
              ]}
            ]},
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Beta"}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "orderedList");
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);

        let p1 = items[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let types1: Vec<&str> = p1.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types1, vec!["text", "hardBreak"]);
        assert_eq!(p1[0].text.as_deref(), Some("Alpha"));
    }

    #[test]
    fn issue_472_trailing_hardbreak_jfm_no_blank_line() {
        // The rendered JFM must not contain a blank line after the
        // trailing hardBreak — that would split the list.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"bulletList","content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Hello"},
                {"type":"hardBreak"}
              ]}
            ]},
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"World"}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();

        // Should produce "- Hello\\n- World\n" (no blank line between items).
        assert_eq!(md, "- Hello\\\n- World\n");
    }

    #[test]
    fn issue_472_multiple_trailing_hardbreaks_roundtrip() {
        // Multiple trailing hardBreaks at the end of a listItem paragraph.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"bulletList","content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Item"},
                {"type":"hardBreak"},
                {"type":"hardBreak"}
              ]}
            ]},
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Next"}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        // Must remain a single bulletList
        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "bulletList");
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);

        // First item should preserve both hardBreaks
        let p1 = items[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let types1: Vec<&str> = p1.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types1, vec!["text", "hardBreak", "hardBreak"]);
    }

    #[test]
    fn issue_472_hardbreak_mid_and_trailing_roundtrip() {
        // A hardBreak in the middle AND at the end of a listItem paragraph.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"bulletList","content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Line one"},
                {"type":"hardBreak"},
                {"type":"text","text":"Line two"},
                {"type":"hardBreak"}
              ]}
            ]},
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Other item"}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "bulletList");
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);

        let p1 = items[0].content.as_ref().unwrap()[0]
            .content
            .as_ref()
            .unwrap();
        let types1: Vec<&str> = p1.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types1, vec!["text", "hardBreak", "text", "hardBreak"]);
        assert_eq!(p1[0].text.as_deref(), Some("Line one"));
        assert_eq!(p1[2].text.as_deref(), Some("Line two"));
    }

    #[test]
    fn issue_472_only_hardbreak_in_listitem_paragraph() {
        // Edge case: paragraph contains only a hardBreak, no text.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"bulletList","content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"hardBreak"}
              ]}
            ]},
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"After"}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        // Must remain a single bulletList with 2 items
        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "bulletList");
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2);
    }

    #[test]
    fn issue_472_three_items_middle_has_trailing_hardbreak() {
        // Three-item list where only the middle item has a trailing hardBreak.
        let adf_json = r#"{"version":1,"type":"doc","content":[
          {"type":"bulletList","content":[
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"First"}
              ]}
            ]},
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Second"},
                {"type":"hardBreak"}
              ]}
            ]},
            {"type":"listItem","content":[
              {"type":"paragraph","content":[
                {"type":"text","text":"Third"}
              ]}
            ]}
          ]}
        ]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 1);
        assert_eq!(rt.content[0].node_type, "bulletList");
        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 3);
        assert_eq!(
            items[0].content.as_ref().unwrap()[0]
                .content
                .as_ref()
                .unwrap()[0]
                .text
                .as_deref(),
            Some("First")
        );
        assert_eq!(
            items[2].content.as_ref().unwrap()[0]
                .content
                .as_ref()
                .unwrap()[0]
                .text
                .as_deref(),
            Some("Third")
        );
    }

    // ── Issue #494: trailing space-only text node after hardBreak ────

    #[test]
    fn issue_494_space_after_hardbreak_roundtrip() {
        // The original reproducer from issue #494: a single space text
        // node following a hardBreak is silently dropped on round-trip.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Some text"},
          {"type":"hardBreak"},
          {"type":"text","text":" "}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "text"],
            "space-only text node after hardBreak should survive round-trip"
        );
        assert_eq!(inlines[2].text.as_deref(), Some(" "));
    }

    #[test]
    fn issue_494_multiple_spaces_after_hardbreak_roundtrip() {
        // Multiple spaces after hardBreak should also survive.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Hello"},
          {"type":"hardBreak"},
          {"type":"text","text":"   "}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "text"],
            "multi-space text node after hardBreak should survive round-trip"
        );
        assert_eq!(inlines[2].text.as_deref(), Some("   "));
    }

    #[test]
    fn issue_494_space_then_text_after_hardbreak_roundtrip() {
        // Space followed by real text after hardBreak — the space should
        // be preserved as part of the text node.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"Before"},
          {"type":"hardBreak"},
          {"type":"text","text":" After"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
        assert_eq!(inlines[2].text.as_deref(), Some(" After"));
    }

    #[test]
    fn issue_494_hardbreak_then_space_then_hardbreak_roundtrip() {
        // Space sandwiched between two hardBreaks.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"A"},
          {"type":"hardBreak"},
          {"type":"text","text":" "},
          {"type":"hardBreak"},
          {"type":"text","text":"B"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "text", "hardBreak", "text"],
            "space between two hardBreaks should survive round-trip"
        );
        assert_eq!(inlines[2].text.as_deref(), Some(" "));
        assert_eq!(inlines[4].text.as_deref(), Some("B"));
    }

    #[test]
    fn issue_494_trailing_space_hardbreak_style_not_confused() {
        // A plain paragraph break (blank line) should still work after
        // a line that does NOT end with a hardBreak marker.
        let md = "first paragraph\n\nsecond paragraph\n";
        let doc = markdown_to_adf(md).unwrap();
        assert_eq!(
            doc.content.len(),
            2,
            "blank line should still separate paragraphs"
        );
    }

    #[test]
    fn issue_494_space_after_trailing_space_hardbreak_roundtrip() {
        // Same bug but with trailing-space style hardBreak (two spaces
        // before newline) instead of backslash style.
        let md = "line one  \n   \n";
        // The above is: "line one" + trailing-space hardBreak + continuation
        // line "   " (2-space indent + 1 space content).  The space-only
        // continuation should not be treated as a blank paragraph break.
        let doc = markdown_to_adf(md).unwrap();
        let inlines = doc.content[0].content.as_ref().unwrap();
        let has_text_after_break = inlines.iter().any(|n| {
            n.node_type == "text"
                && n.text
                    .as_deref()
                    .is_some_and(|t| t.trim().is_empty() && !t.is_empty())
        });
        assert!(
            has_text_after_break || inlines.len() >= 2,
            "space-only line after trailing-space hardBreak should be preserved"
        );
    }

    #[test]
    fn issue_494_space_after_hardbreak_in_list_item_roundtrip() {
        // Exercises the same bug inside a list item context.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[
          {"type":"listItem","content":[{"type":"paragraph","content":[
            {"type":"text","text":"item"},
            {"type":"hardBreak"},
            {"type":"text","text":" "}
          ]}]}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let list = &rt.content[0];
        let item = &list.content.as_ref().unwrap()[0];
        let para = &item.content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "text"],
            "space after hardBreak in list item should survive round-trip"
        );
        assert_eq!(inlines[2].text.as_deref(), Some(" "));
    }

    // ── Issue #510: trailing spaces in text node should not become hardBreak ──

    #[test]
    fn issue_510_trailing_double_space_paragraph_roundtrip() {
        // Two trailing spaces in a text node must survive round-trip without
        // being converted to a hardBreak or merging the next paragraph.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"first paragraph with trailing spaces  "}]},{"type":"paragraph","content":[{"type":"text","text":"second paragraph"}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        // Must produce two separate paragraphs
        assert_eq!(
            rt.content.len(),
            2,
            "should produce two paragraphs, got: {}",
            rt.content.len()
        );
        assert_eq!(rt.content[0].node_type, "paragraph");
        assert_eq!(rt.content[1].node_type, "paragraph");

        // First paragraph text preserves trailing spaces
        let p1 = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            p1[0].text.as_deref(),
            Some("first paragraph with trailing spaces  "),
            "trailing spaces should be preserved in first paragraph"
        );

        // Second paragraph is intact
        let p2 = rt.content[1].content.as_ref().unwrap();
        assert_eq!(p2[0].text.as_deref(), Some("second paragraph"));

        // No hardBreak nodes should exist
        let all_types: Vec<&str> = p1.iter().map(|n| n.node_type.as_str()).collect();
        assert!(
            !all_types.contains(&"hardBreak"),
            "trailing spaces should not produce hardBreak, got: {all_types:?}"
        );
    }

    #[test]
    fn issue_510_trailing_triple_space_roundtrip() {
        // Three trailing spaces also must not become a hardBreak.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"text   "}]},{"type":"paragraph","content":[{"type":"text","text":"next"}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        assert_eq!(rt.content.len(), 2, "should still be two paragraphs");
        let p1 = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            p1[0].text.as_deref(),
            Some("text   "),
            "three trailing spaces should be preserved"
        );
    }

    #[test]
    fn issue_510_trailing_spaces_with_backslash_roundtrip() {
        // Text ending with backslash + trailing spaces: both must survive.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"end\\  "}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let p = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            p[0].text.as_deref(),
            Some("end\\  "),
            "backslash + trailing spaces should both survive"
        );
    }

    #[test]
    fn issue_510_jfm_contains_escaped_trailing_space() {
        // Verify the serializer actually emits the backslash-space escape.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"hello  "}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(r"\ "),
            "JFM should contain backslash-space escape for trailing spaces, got: {md:?}"
        );
        // Must NOT end with two plain spaces before newline
        for line in md.lines() {
            assert!(
                !line.ends_with("  "),
                "no JFM line should end with two plain spaces, got: {line:?}"
            );
        }
    }

    #[test]
    fn issue_510_single_trailing_space_not_escaped() {
        // A single trailing space should NOT be escaped (not a hardBreak trigger).
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"word "}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            !md.contains('\\'),
            "single trailing space should not be escaped, got: {md:?}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let p = rt.content[0].content.as_ref().unwrap();
        assert_eq!(p[0].text.as_deref(), Some("word "));
    }

    #[test]
    fn issue_510_trailing_spaces_in_heading_roundtrip() {
        // Trailing double-spaces in a heading text node should also survive.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"heading","attrs":{"level":2},"content":[{"type":"text","text":"heading  "}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let h = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            h[0].text.as_deref(),
            Some("heading  "),
            "trailing spaces in heading should be preserved"
        );
    }

    #[test]
    fn issue_510_trailing_spaces_in_list_item_roundtrip() {
        // Trailing double-spaces in a bullet list item text node.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"item  "}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let list = &rt.content[0];
        let item = &list.content.as_ref().unwrap()[0];
        let para = &item.content.as_ref().unwrap()[0];
        let inlines = para.content.as_ref().unwrap();
        assert_eq!(
            inlines[0].text.as_deref(),
            Some("item  "),
            "trailing spaces in list item should be preserved"
        );
    }

    #[test]
    fn issue_510_trailing_spaces_with_bold_mark_roundtrip() {
        // Trailing spaces in a bold-marked text node: the closing **
        // comes after the spaces, so the line doesn't end with spaces.
        // But the escape should still be applied (and be harmless).
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"bold  ","marks":[{"type":"strong"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let p = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            p[0].text.as_deref(),
            Some("bold  "),
            "trailing spaces in bold text should be preserved"
        );
    }

    #[test]
    fn issue_510_hardbreak_between_paragraphs_still_works() {
        // Actual hardBreak nodes must still round-trip correctly.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"line one"},{"type":"hardBreak"},{"type":"text","text":"line two"}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let inlines = rt.content[0].content.as_ref().unwrap();
        let types: Vec<&str> = inlines.iter().map(|n| n.node_type.as_str()).collect();
        assert_eq!(
            types,
            vec!["text", "hardBreak", "text"],
            "explicit hardBreak should still round-trip"
        );
    }

    #[test]
    fn issue_510_all_spaces_text_node_roundtrip() {
        // A text node that is entirely spaces (2+) should survive.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[{"type":"text","text":"  "}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let p = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            p[0].text.as_deref(),
            Some("  "),
            "space-only text node should survive round-trip"
        );
    }

    // ── Issue #522: listItem multi-paragraph merge ──────────────────────

    #[test]
    fn issue_522_listitem_hardbreak_then_two_paragraphs_roundtrips() {
        // The exact reproducer from issue #522: first paragraph has
        // hardBreak nodes, followed by two sibling paragraphs.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"preamble"},{"type":"hardBreak"},{"type":"text","text":"\u00a0"},{"type":"hardBreak"},{"type":"text","text":"line with "},{"marks":[{"type":"code"}],"text":"code","type":"text"},{"type":"text","text":". "}]},{"type":"paragraph","content":[{"type":"text","text":"second paragraph"}]},{"type":"paragraph","content":[{"type":"text","text":"third paragraph"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 1);
        let children = items[0].content.as_ref().unwrap();
        assert_eq!(
            children.len(),
            3,
            "Expected 3 paragraphs in listItem, got {}",
            children.len()
        );
        assert_eq!(children[0].node_type, "paragraph");
        assert_eq!(children[1].node_type, "paragraph");
        assert_eq!(children[2].node_type, "paragraph");

        // Verify the text content of each paragraph
        let text1 = children[1].content.as_ref().unwrap()[0]
            .text
            .as_deref()
            .unwrap();
        assert_eq!(text1, "second paragraph");
        let text2 = children[2].content.as_ref().unwrap()[0]
            .text
            .as_deref()
            .unwrap();
        assert_eq!(text2, "third paragraph");
    }

    #[test]
    fn issue_522_ordered_list_hardbreak_then_paragraphs_roundtrips() {
        // Same scenario in an ordered list.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"orderedList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"first"},{"type":"hardBreak"},{"type":"text","text":"continued"}]},{"type":"paragraph","content":[{"type":"text","text":"second para"}]},{"type":"paragraph","content":[{"type":"text","text":"third para"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let items = rt.content[0].content.as_ref().unwrap();
        let children = items[0].content.as_ref().unwrap();
        assert_eq!(
            children.len(),
            3,
            "Expected 3 paragraphs in ordered listItem, got {}",
            children.len()
        );
        assert_eq!(children[1].node_type, "paragraph");
        assert_eq!(children[2].node_type, "paragraph");
        assert_eq!(
            children[1].content.as_ref().unwrap()[0]
                .text
                .as_deref()
                .unwrap(),
            "second para"
        );
        assert_eq!(
            children[2].content.as_ref().unwrap()[0]
                .text
                .as_deref()
                .unwrap(),
            "third para"
        );
    }

    #[test]
    fn issue_522_two_paragraphs_without_hardbreak_roundtrips() {
        // Two paragraphs without hardBreak — should also remain separate.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"first paragraph"}]},{"type":"paragraph","content":[{"type":"text","text":"second paragraph"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let items = rt.content[0].content.as_ref().unwrap();
        let children = items[0].content.as_ref().unwrap();
        assert_eq!(
            children.len(),
            2,
            "Expected 2 paragraphs in listItem, got {}",
            children.len()
        );
        assert_eq!(children[0].node_type, "paragraph");
        assert_eq!(children[1].node_type, "paragraph");
    }

    #[test]
    fn issue_522_paragraph_then_nested_list_no_spurious_blank() {
        // A paragraph followed by a nested list should NOT get a blank
        // separator (only paragraph-paragraph transitions need one).
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"parent"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"child"}]}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // Should not contain a blank indented line between parent text and sub-list
        assert!(
            !md.contains("  \n  -"),
            "No blank separator between paragraph and nested list"
        );
        let rt = markdown_to_adf(&md).unwrap();

        let items = rt.content[0].content.as_ref().unwrap();
        let children = items[0].content.as_ref().unwrap();
        assert_eq!(children.len(), 2);
        assert_eq!(children[0].node_type, "paragraph");
        assert_eq!(children[1].node_type, "bulletList");
    }

    #[test]
    fn issue_522_three_paragraphs_no_hardbreak_roundtrips() {
        // Three plain paragraphs (no hardBreak) inside a single listItem.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"alpha"}]},{"type":"paragraph","content":[{"type":"text","text":"bravo"}]},{"type":"paragraph","content":[{"type":"text","text":"charlie"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let items = rt.content[0].content.as_ref().unwrap();
        let children = items[0].content.as_ref().unwrap();
        assert_eq!(
            children.len(),
            3,
            "Expected 3 paragraphs, got {}",
            children.len()
        );
        for (i, child) in children.iter().enumerate() {
            assert_eq!(
                child.node_type, "paragraph",
                "Child {i} should be a paragraph"
            );
        }
    }

    #[test]
    fn issue_522_multiple_list_items_each_with_paragraphs() {
        // Multiple list items, each with multiple paragraphs.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"item1 p1"}]},{"type":"paragraph","content":[{"type":"text","text":"item1 p2"}]}]},{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"item2 p1"},{"type":"hardBreak"},{"type":"text","text":"item2 cont"}]},{"type":"paragraph","content":[{"type":"text","text":"item2 p2"}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let items = rt.content[0].content.as_ref().unwrap();
        assert_eq!(items.len(), 2, "Expected 2 list items");

        let item1 = items[0].content.as_ref().unwrap();
        assert_eq!(item1.len(), 2, "Item 1 should have 2 paragraphs");

        let item2 = items[1].content.as_ref().unwrap();
        assert_eq!(item2.len(), 2, "Item 2 should have 2 paragraphs");
        // Verify hardBreak is preserved in item2's first paragraph
        let item2_p1_inlines = item2[0].content.as_ref().unwrap();
        let types: Vec<&str> = item2_p1_inlines
            .iter()
            .map(|n| n.node_type.as_str())
            .collect();
        assert_eq!(types, vec!["text", "hardBreak", "text"]);
    }

    #[test]
    fn issue_531_blockquote_hardbreak_then_two_paragraphs_roundtrips() {
        // The exact reproducer from issue #531: blockquote with first
        // paragraph containing hardBreak nodes, followed by two sibling
        // paragraphs.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"blockquote","content":[{"type":"paragraph","content":[{"type":"text","text":"preamble"},{"type":"hardBreak"},{"type":"text","text":"\u00a0"},{"type":"hardBreak"},{"type":"text","text":"line with "},{"marks":[{"type":"code"}],"text":"code","type":"text"},{"type":"text","text":". "}]},{"type":"paragraph","content":[{"type":"text","text":"second paragraph"}]},{"type":"paragraph","content":[{"type":"text","text":"third paragraph"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let children = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            children.len(),
            3,
            "Expected 3 paragraphs in blockquote, got {}",
            children.len()
        );
        assert_eq!(children[0].node_type, "paragraph");
        assert_eq!(children[1].node_type, "paragraph");
        assert_eq!(children[2].node_type, "paragraph");

        let text1 = children[1].content.as_ref().unwrap()[0]
            .text
            .as_deref()
            .unwrap();
        assert_eq!(text1, "second paragraph");
        let text2 = children[2].content.as_ref().unwrap()[0]
            .text
            .as_deref()
            .unwrap();
        assert_eq!(text2, "third paragraph");
    }

    #[test]
    fn issue_531_blockquote_two_paragraphs_without_hardbreak_roundtrips() {
        // Two simple paragraphs inside a blockquote, no hardBreak.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"blockquote","content":[{"type":"paragraph","content":[{"type":"text","text":"first"}]},{"type":"paragraph","content":[{"type":"text","text":"second"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let children = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            children.len(),
            2,
            "Expected 2 paragraphs in blockquote, got {}",
            children.len()
        );
        assert_eq!(children[0].node_type, "paragraph");
        assert_eq!(children[1].node_type, "paragraph");
    }

    #[test]
    fn issue_531_blockquote_three_paragraphs_no_hardbreak_roundtrips() {
        // Three paragraphs, none with hardBreak.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"blockquote","content":[{"type":"paragraph","content":[{"type":"text","text":"alpha"}]},{"type":"paragraph","content":[{"type":"text","text":"beta"}]},{"type":"paragraph","content":[{"type":"text","text":"gamma"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let children = rt.content[0].content.as_ref().unwrap();
        assert_eq!(
            children.len(),
            3,
            "Expected 3 paragraphs in blockquote, got {}",
            children.len()
        );
        for child in children {
            assert_eq!(child.node_type, "paragraph");
        }
    }

    #[test]
    fn issue_531_blockquote_paragraph_then_list_no_spurious_blank() {
        // A paragraph followed by a nested list inside a blockquote —
        // should NOT insert a blank separator line.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"blockquote","content":[{"type":"paragraph","content":[{"type":"text","text":"intro"}]},{"type":"bulletList","content":[{"type":"listItem","content":[{"type":"paragraph","content":[{"type":"text","text":"item one"}]}]}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let children = rt.content[0].content.as_ref().unwrap();
        assert_eq!(children[0].node_type, "paragraph");
        assert_eq!(children[1].node_type, "bulletList");
    }

    #[test]
    fn issue_531_blockquote_single_paragraph_unchanged() {
        // A single paragraph in a blockquote should remain unchanged.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"blockquote","content":[{"type":"paragraph","content":[{"type":"text","text":"solo"}]}]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();

        let children = rt.content[0].content.as_ref().unwrap();
        assert_eq!(children.len(), 1);
        assert_eq!(children[0].node_type, "paragraph");
        let text = children[0].content.as_ref().unwrap()[0]
            .text
            .as_deref()
            .unwrap();
        assert_eq!(text, "solo");
    }

    // ── Issue #554: marks combined with `code` or with each other ──────

    /// Helper: roundtrip an ADF document and assert the marks on the first
    /// text node match `expected_marks` (in order).
    fn assert_roundtrip_marks(adf_json: &str, expected_marks: &[&str]) {
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let node = &rt.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .expect("should have marks")
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(
            mark_types, expected_marks,
            "mark order mismatch for md={md}"
        );
    }

    #[test]
    fn issue_554_code_and_text_color_preserved() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"x","marks":[
            {"type":"textColor","attrs":{"color":"#008000"}},
            {"type":"code"}
          ]}
        ]}]}"##;
        assert_roundtrip_marks(adf_json, &["textColor", "code"]);
    }

    #[test]
    fn issue_554_code_and_bg_color_preserved() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"x","marks":[
            {"type":"backgroundColor","attrs":{"color":"#FF0000"}},
            {"type":"code"}
          ]}
        ]}]}"##;
        assert_roundtrip_marks(adf_json, &["backgroundColor", "code"]);
    }

    #[test]
    fn issue_554_code_and_subsup_preserved() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"x","marks":[
            {"type":"subsup","attrs":{"type":"sub"}},
            {"type":"code"}
          ]}
        ]}]}"#;
        assert_roundtrip_marks(adf_json, &["subsup", "code"]);
    }

    #[test]
    fn issue_554_code_and_underline_preserved() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"x","marks":[
            {"type":"underline"},
            {"type":"code"}
          ]}
        ]}]}"#;
        assert_roundtrip_marks(adf_json, &["underline", "code"]);
    }

    #[test]
    fn issue_554_code_textcolor_and_underline_preserved() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"x","marks":[
            {"type":"textColor","attrs":{"color":"#008000"}},
            {"type":"underline"},
            {"type":"code"}
          ]}
        ]}]}"##;
        assert_roundtrip_marks(adf_json, &["textColor", "underline", "code"]);
    }

    #[test]
    fn issue_554_textcolor_and_underline_preserved() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"x","marks":[
            {"type":"textColor","attrs":{"color":"#008000"}},
            {"type":"underline"}
          ]}
        ]}]}"##;
        assert_roundtrip_marks(adf_json, &["textColor", "underline"]);
    }

    #[test]
    fn issue_554_underline_and_textcolor_preserved_order_swapped() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"x","marks":[
            {"type":"underline"},
            {"type":"textColor","attrs":{"color":"#008000"}}
          ]}
        ]}]}"##;
        // underline appears first, so it should be the OUTER wrapper.
        assert_roundtrip_marks(adf_json, &["underline", "textColor"]);
    }

    #[test]
    fn issue_554_textcolor_and_annotation_preserved() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"x","marks":[
            {"type":"textColor","attrs":{"color":"#008000"}},
            {"type":"annotation","attrs":{"id":"abc-123","annotationType":"inlineComment"}}
          ]}
        ]}]}"##;
        assert_roundtrip_marks(adf_json, &["textColor", "annotation"]);
    }

    #[test]
    fn issue_554_bgcolor_and_underline_preserved() {
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"x","marks":[
            {"type":"backgroundColor","attrs":{"color":"#FF0000"}},
            {"type":"underline"}
          ]}
        ]}]}"##;
        assert_roundtrip_marks(adf_json, &["backgroundColor", "underline"]);
    }

    #[test]
    fn issue_554_subsup_and_underline_preserved() {
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"x","marks":[
            {"type":"subsup","attrs":{"type":"sub"}},
            {"type":"underline"}
          ]}
        ]}]}"#;
        assert_roundtrip_marks(adf_json, &["subsup", "underline"]);
    }

    #[test]
    fn issue_554_exact_reproducer_full_match() {
        // The exact reproducer from issue #554. The byte-for-byte ADF JSON
        // must round-trip through `from-adf | to-adf` unchanged.
        let adf_json = r##"{
          "version": 1,
          "type": "doc",
          "content": [
            {
              "type": "paragraph",
              "content": [
                {"type":"text","text":"Status: ","marks":[{"type":"strong"}]},
                {"type":"text","text":"Approved","marks":[
                  {"type":"textColor","attrs":{"color":"#008000"}}
                ]},
                {"type":"text","text":" — ready to proceed"}
              ]
            }
          ]
        }"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(":span[Approved]{color=#008000}"),
            "JFM should contain green span: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        // Find the "Approved" text node and verify color is preserved.
        let approved = rt.content[0]
            .content
            .as_ref()
            .unwrap()
            .iter()
            .find(|n| n.text.as_deref() == Some("Approved"))
            .expect("Approved text node");
        let marks = approved.marks.as_ref().expect("should have marks");
        let color_mark = marks
            .iter()
            .find(|m| m.mark_type == "textColor")
            .expect("textColor mark must be preserved");
        assert_eq!(color_mark.attrs.as_ref().unwrap()["color"], "#008000");
    }

    #[test]
    fn issue_554_textcolor_with_code_renders_span_around_code() {
        // Verify the rendered JFM uses `:span[`text`]{color=...}` — the
        // syntax suggested in the issue.
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "fn main",
                vec![
                    AdfMark::text_color("#008000"),
                    AdfMark {
                        mark_type: "code".to_string(),
                        attrs: None,
                    },
                ],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains(":span[`fn main`]{color=#008000}"),
            "expected span-wrapped code, got: {md}"
        );
    }

    #[test]
    fn issue_554_underline_with_code_renders_bracketed_around_code() {
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text_with_marks(
                "fn main",
                vec![
                    AdfMark::underline(),
                    AdfMark {
                        mark_type: "code".to_string(),
                        attrs: None,
                    },
                ],
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("[`fn main`]{underline}"),
            "expected bracketed-span around code, got: {md}"
        );
    }

    // ── Issue #554 (re-opened): boundary-underscore destroys span directives ──

    #[test]
    fn issue_554_underscore_adjacent_to_textcolor_span_roundtrip() {
        // Reproducer from the re-opened issue: a `_ ` plain-text node followed
        // by a textColor span whose text starts with `_` produced JFM that the
        // parser saw as an italic delimiter pair, destroying the span and
        // losing the textColor mark entirely.
        let adf_json = r##"{
          "version": 1,
          "type": "doc",
          "content": [
            {
              "type": "paragraph",
              "content": [
                {"type":"text","text":"_ "},
                {"type":"text","text":"_Action:*","marks":[
                  {"type":"textColor","attrs":{"color":"#008000"}}
                ]},
                {"type":"text","text":" Complete the setup process."}
              ]
            }
          ]
        }"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // The leading `_` chars must be backslash-escaped so the parser
        // doesn't form a false italic pair across the span boundary.
        assert!(
            md.contains(r"\_ ") && md.contains(r":span[\_Action"),
            "underscores at node boundaries should be escaped: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let para_content = rt.content[0].content.as_ref().unwrap();
        // Find the textColor-marked node.
        let colored = para_content
            .iter()
            .find(|n| {
                n.marks
                    .as_deref()
                    .is_some_and(|ms| ms.iter().any(|m| m.mark_type == "textColor"))
            })
            .expect("textColor node must be preserved");
        assert_eq!(colored.text.as_deref(), Some("_Action:*"));
        let color_mark = colored
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .find(|m| m.mark_type == "textColor")
            .unwrap();
        assert_eq!(color_mark.attrs.as_ref().unwrap()["color"], "#008000");
        // Verify no spurious em mark crept in.
        for n in para_content {
            if let Some(ms) = n.marks.as_deref() {
                assert!(
                    !ms.iter().any(|m| m.mark_type == "em"),
                    "no em mark should appear, got marks {:?}",
                    ms.iter().map(|m| &m.mark_type).collect::<Vec<_>>()
                );
            }
        }
    }

    #[test]
    fn issue_554_underscore_intraword_left_unescaped() {
        // Sanity check: ordinary intraword underscores like `do_something_useful`
        // should NOT be escaped — escaping would still round-trip correctly,
        // but produces noisy backslashes in the JFM output.
        let doc = AdfDocument {
            version: 1,
            doc_type: "doc".to_string(),
            content: vec![AdfNode::paragraph(vec![AdfNode::text(
                "call do_something_useful now",
            )])],
        };
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.contains("do_something_useful") && !md.contains(r"do\_something\_useful"),
            "intraword underscores should not be escaped: {md}"
        );
    }

    #[test]
    fn issue_554_code_underline_then_textcolor_bracketed_outer() {
        // Mark order [underline, textColor, code] — bracketed-span outer,
        // span inner. Exercises wrap_with_attrs (true, true) !span_before.
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"x","marks":[
            {"type":"underline"},
            {"type":"textColor","attrs":{"color":"#008000"}},
            {"type":"code"}
          ]}
        ]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        // Bracketed-span should be the outermost wrapper.
        assert!(
            md.starts_with('[') && md.contains("underline}"),
            "bracketed-span should wrap the span, got: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let node = &rt.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(mark_types, vec!["underline", "textColor", "code"]);
    }

    #[test]
    fn issue_554_textcolor_underline_link_all_preserved() {
        // Mark order [textColor, underline, link] — span outer, bracketed
        // wraps the link inside. Exercises the span-wraps-link-with-bracketed
        // branch.
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"linked","marks":[
            {"type":"textColor","attrs":{"color":"#008000"}},
            {"type":"underline"},
            {"type":"link","attrs":{"href":"https://example.com"}}
          ]}
        ]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let node = &rt.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(mark_types, vec!["textColor", "underline", "link"]);
    }

    #[test]
    fn issue_554_underline_textcolor_link_bracketed_outer_link_last() {
        // Mark order [underline, textColor, link] — bracketed-span outer of
        // both span and link. Exercises the bracketed-wraps-everything branch.
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"linked","marks":[
            {"type":"underline"},
            {"type":"textColor","attrs":{"color":"#008000"}},
            {"type":"link","attrs":{"href":"https://example.com"}}
          ]}
        ]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        let node = &rt.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(mark_types, vec!["underline", "textColor", "link"]);
    }

    #[test]
    fn issue_554_link_underline_textcolor_link_outer() {
        // Mark order [link, underline, textColor] — link outermost, wraps a
        // bracketed-span that wraps the span. Exercises the link-wraps-
        // bracketed-wraps-span branch.
        let adf_json = r##"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"linked","marks":[
            {"type":"link","attrs":{"href":"https://example.com"}},
            {"type":"underline"},
            {"type":"textColor","attrs":{"color":"#008000"}}
          ]}
        ]}]}"##;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        assert!(
            md.starts_with('[') && md.contains("](https://example.com)"),
            "link should be outermost, got: {md}"
        );
        let rt = markdown_to_adf(&md).unwrap();
        let node = &rt.content[0].content.as_ref().unwrap()[0];
        let mark_types: Vec<&str> = node
            .marks
            .as_ref()
            .unwrap()
            .iter()
            .map(|m| m.mark_type.as_str())
            .collect();
        assert_eq!(mark_types, vec!["link", "underline", "textColor"]);
    }

    #[test]
    fn issue_554_trailing_underscore_then_leading_underscore_round_trip() {
        // Two adjacent text nodes where the first ends with `_` and the
        // second starts with `_` — without escaping, the JFM parser sees
        // an `_..._` pair spanning the boundary.
        let adf_json = r#"{"version":1,"type":"doc","content":[{"type":"paragraph","content":[
          {"type":"text","text":"end_"},
          {"type":"text","text":"_start"}
        ]}]}"#;
        let doc: AdfDocument = serde_json::from_str(adf_json).unwrap();
        let md = adf_to_markdown(&doc).unwrap();
        let rt = markdown_to_adf(&md).unwrap();
        // Reassemble all text in the paragraph.
        let combined: String = rt.content[0]
            .content
            .as_ref()
            .unwrap()
            .iter()
            .filter_map(|n| n.text.as_deref())
            .collect();
        assert_eq!(combined, "end__start");
        // No node should have an em mark.
        for n in rt.content[0].content.as_ref().unwrap() {
            if let Some(ms) = n.marks.as_deref() {
                assert!(!ms.iter().any(|m| m.mark_type == "em"));
            }
        }
    }

    // ── Nesting depth limit (issue #1130) ──────────────────────────────
    //
    // Without MAX_NESTING_DEPTH each of these inputs recurses one stack
    // frame per nesting level, overflowing the stack — an uncatchable
    // abort.  The block-path tests assert a clean error; the inline-path
    // tests assert graceful degradation (no abort, valid document).

    #[test]
    fn blockquote_nesting_beyond_cap_errors() {
        let md = format!("{}x", "> ".repeat(200));
        let err = markdown_to_adf(&md).unwrap_err();
        assert!(err.to_string().contains("maximum depth"));
    }

    #[test]
    fn list_nesting_beyond_cap_errors() {
        let mut md = String::new();
        for i in 0..200 {
            md.push_str(&"  ".repeat(i));
            md.push_str("- x\n");
        }
        let err = markdown_to_adf(&md).unwrap_err();
        assert!(err.to_string().contains("maximum depth"));
    }

    #[test]
    fn container_directive_nesting_beyond_cap_errors() {
        let mut md = String::new();
        for _ in 0..200 {
            md.push_str(":::panel{type=info}\n");
        }
        md.push_str("body\n");
        for _ in 0..200 {
            md.push_str(":::\n");
        }
        let err = markdown_to_adf(&md).unwrap_err();
        assert!(err.to_string().contains("maximum depth"));
    }

    // ── Unclosed container directives (issue #1734) ──
    //
    // A `:::name` container directive with no matching close fence must
    // return a clean error naming the directive and its start line, not
    // panic. `td`/`tr`/`th` and `column` are only meaningful nested inside
    // `:::table`/`:::layout`, so they always fall through `try_container_directive`'s
    // unhandled-name path when unclosed — previously that left the parser's
    // position corrupted, causing an index-out-of-bounds panic in the next
    // block-type parser tried.

    #[test]
    fn bare_td_directive_errors_without_panicking() {
        let err = markdown_to_adf(":::td\n").unwrap_err();
        let msg = err.to_string();
        assert!(msg.contains("Unclosed"));
        assert!(msg.contains("td"));
    }

    #[test]
    fn bare_tr_directive_errors_without_panicking() {
        let err = markdown_to_adf(":::tr\n").unwrap_err();
        let msg = err.to_string();
        assert!(msg.contains("Unclosed"));
        assert!(msg.contains("tr"));
    }

    #[test]
    fn bare_td_directive_after_blank_lines_errors() {
        let err = markdown_to_adf("\n\t\n:::td\n").unwrap_err();
        let msg = err.to_string();
        assert!(msg.contains("Unclosed"));
        assert!(msg.contains("td"));
        assert!(msg.contains("line 3"));
    }

    #[test]
    fn bare_column_directive_errors_without_panicking() {
        let err = markdown_to_adf(":::column\n").unwrap_err();
        let msg = err.to_string();
        assert!(msg.contains("Unclosed"));
        assert!(msg.contains("column"));
    }

    #[test]
    fn directive_table_cell_nesting_beyond_cap_errors() {
        let mut md = String::new();
        for _ in 0..200 {
            md.push_str("::::table\n:::tr\n:::td\n");
        }
        md.push_str("cell\n");
        for _ in 0..200 {
            md.push_str(":::\n:::\n::::\n");
        }
        let err = markdown_to_adf(&md).unwrap_err();
        assert!(err.to_string().contains("maximum depth"));
    }

    #[test]
    fn layout_column_nesting_beyond_cap_errors() {
        let mut md = String::new();
        for _ in 0..200 {
            md.push_str("::::layout\n:::column{width=100}\n");
        }
        md.push_str("x\n");
        for _ in 0..200 {
            md.push_str(":::\n::::\n");
        }
        let err = markdown_to_adf(&md).unwrap_err();
        assert!(err.to_string().contains("maximum depth"));
    }

    #[test]
    fn blockquote_nesting_at_cap_boundary() {
        // A parser at depth d handles the (d+1)-th `>` level, so exactly
        // MAX_NESTING_DEPTH levels succeed and one more errors.
        let at_cap = format!("{}x", "> ".repeat(MAX_NESTING_DEPTH));
        assert!(markdown_to_adf(&at_cap).is_ok());
        let past_cap = format!("{}x", "> ".repeat(MAX_NESTING_DEPTH + 1));
        let err = markdown_to_adf(&past_cap).unwrap_err();
        assert!(err.to_string().contains("maximum depth"));
    }

    #[test]
    fn list_nesting_at_cap_succeeds() {
        // The nested-list path has the largest debug-build stack frames, so
        // an at-cap success here proves the cap leaves stack headroom on a
        // default 2 MiB test thread (the canary for MAX_NESTING_DEPTH).
        let mut md = String::new();
        for i in 0..MAX_NESTING_DEPTH {
            md.push_str(&"  ".repeat(i));
            md.push_str("- x\n");
        }
        assert!(markdown_to_adf(&md).is_ok());
    }

    #[test]
    fn deep_but_reasonable_nesting_succeeds() {
        let md = format!("{}deep", "> ".repeat(20));
        let doc = markdown_to_adf(&md).unwrap();
        // Walk down the 20 blockquote levels to the paragraph.
        let mut node = &doc.content[0];
        for _ in 0..20 {
            assert_eq!(node.node_type, "blockquote");
            node = &node.content.as_ref().unwrap()[0];
        }
        assert_eq!(node.node_type, "paragraph");
    }

    #[test]
    fn deeply_nested_emphasis_degrades_without_overflow() {
        let md = format!("{}x{}", "*_".repeat(400), "_*".repeat(400));
        let doc = markdown_to_adf(&md).unwrap();
        assert_eq!(doc.content[0].node_type, "paragraph");
    }

    #[test]
    fn deeply_nested_links_degrade_without_overflow() {
        let mut md = String::from("x");
        for _ in 0..400 {
            md = format!("[{md}](https://example.com)");
        }
        let doc = markdown_to_adf(&md).unwrap();
        assert_eq!(doc.content[0].node_type, "paragraph");
    }

    #[test]
    fn deeply_nested_bracketed_spans_degrade_without_overflow() {
        let mut md = String::from("x");
        for _ in 0..400 {
            md = format!("[{md}]{{underline}}");
        }
        let doc = markdown_to_adf(&md).unwrap();
        assert_eq!(doc.content[0].node_type, "paragraph");
    }
}