markon-core 0.13.10

/* ============================================================
   MARKON DESIGN TOKENS
   4 semantic colors + typography + opacity.
   Specific usages derive from these — no per-element config.
   Override via Settings → Page styles (injected as :root vars).
   ============================================================ */
:root {
    /* ── Core palette (light) ──────────────────────────────── */
    --markon-primary:   #0969da;   /* links, accents, TOC selected, buttons */
    --markon-muted:     #656d76;   /* secondary text, toolbar, separators */
    --markon-border:    #d1d9e0;   /* heading underlines, panel borders */
    --markon-subtle:    #f6f8fa;   /* subtle backgrounds */

    /* ── Surfaces & contrast (light) ──────────────────────── */
    --markon-canvas:        #ffffff; /* page / editor canvas base */
    --markon-text:          #1f2328; /* body text */
    --markon-text-muted:    #656d76; /* secondary text on elevated surfaces (sphere icons, TOC bar) */
    --markon-elevated:      #f6f8fa; /* one step above subtle: floats, cards, TOC icon */
    --markon-elevated-2:    #f1f5f9; /* one step above elevated: chat user bubble */
    --markon-overlay:       #ffffff; /* recessed popover/dropdown background */
    --markon-border-strong: #d0d7de; /* stronger border: float edges, strokes on dark surfaces */

    /* ── Typography ────────────────────────────────────────── */
    --markon-ui-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --markon-ui-font-size: 0.80rem;

    /* ── Opacity ───────────────────────────────────────────── */
    --markon-panel-opacity: 0.9;
    --markon-collapsed-opacity: 0.6;

    /* ── Derived (auto-computed, not user-configurable) ───── */
    --markon-primary-hover: color-mix(in srgb, var(--markon-primary) 80%, black);
    --markon-muted-hover:   color-mix(in srgb, var(--markon-muted) 60%, black);
    --markon-primary-bg:    color-mix(in srgb, var(--markon-primary) 10%, transparent);
}

html[data-theme="dark"] {
    --markon-primary:   #58a6ff;
    --markon-muted:     #8b949e;
    --markon-border:    #30363d;
    --markon-subtle:    #161b22;
    --markon-canvas:        #0d1117;
    --markon-text:          #f0f6fc;
    --markon-text-muted:    #adbac7;
    --markon-elevated:      #2d333b;
    --markon-elevated-2:    #373e47;
    --markon-overlay:       #21262d;
    --markon-border-strong: #484f58;
    --markon-primary-hover: color-mix(in srgb, var(--markon-primary) 80%, white);
    --markon-muted-hover:   color-mix(in srgb, var(--markon-muted) 60%, white);
    --markon-primary-bg:    color-mix(in srgb, var(--markon-primary) 15%, transparent);
}

:root {
    --markon-collapsed-opacity-hover: 0.85;
}

/* ============================================================
   SELECTION POPOVER
   Floating toolbar for text annotation actions.
   Design intent: "anti-theme" dark surface with white text in BOTH
   light and dark modes — keeps the floating toolbar visually distinct
   from page content. Hardcoded colors below are intentional, do NOT
   tokenize.
   ============================================================ */

.selection-popover {
    position: absolute;
    background-color: #2c2c2c;
    border-radius: 4px;
    padding: 3px 6px 3px 3px;
    display: none;
    z-index: var(--markon-z-chrome-toolbar);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    color: white;
}

/* Drag handle — the only region that initiates a popover drag. */
.popover-drag-handle {
    display: inline-block;
    position: relative;
    width: 8px;
    height: 18px;
    margin-right: 4px;
    vertical-align: middle;
    cursor: grab;
    user-select: none;
}

.popover-drag-handle::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 2px;
    height: 12px;
    background: #666;
    border-radius: 1px;
    transition: background 0.15s;
}

.popover-drag-handle:hover::before {
    background: #aaa;
}

.popover-drag-handle:active {
    cursor: grabbing;
}

.selection-popover button {
    background: none;
    border: none;
    color: white;
    padding: 5px 8px;
    cursor: pointer;
    font-size: 12px;
    transition: background-color 0.2s;
}

.selection-popover button:hover {
    background-color: #4a4a4a;
    border-radius: 3px;
}

.popover-separator {
    color: #666;
    margin: 0 4px;
    font-size: 12px;
    user-select: none;
}

/* Temporary selection overlay (shown when note modal is open) */
.temp-selection-overlay {
    position: absolute;
    background-color: rgba(100, 150, 255, 0.3);
    pointer-events: none;
    z-index: var(--markon-z-modal-backdrop);
}

/* ============================================================
   LINK COLORS IN MARKDOWN BODY
   Override all states for consistency
   ============================================================ */

.markdown-body a:link,
.markdown-body a:visited,
.markdown-body a:hover,
.markdown-body a:active,
.markdown-body a:focus {
    /* Specificity (0,2,1) matches github-markdown's `.markdown-body a:hover`
       and beats `.markdown-body a` (0,1,1); later source order wins ties. */
    color: var(--markon-primary);
}

/* ============================================================
   TEXT HIGHLIGHTS
   Color-coded text highlighting with theme support
   ============================================================ */

/* Light mode highlights */
.highlight-orange {
    background-color: rgba(255, 165, 0, 0.5);
}

.highlight-green {
    background-color: rgba(144, 238, 144, 0.6);
}

.highlight-yellow {
    background-color: rgba(255, 255, 0, 0.5);
}

/* Dark mode highlights - softer, more readable */
html[data-theme="dark"] .highlight-orange {
    background-color: rgba(224, 108, 43, 0.35);
}

html[data-theme="dark"] .highlight-green {
    background-color: rgba(46, 160, 67, 0.35);
}

html[data-theme="dark"] .highlight-yellow {
    background-color: rgba(187, 128, 9, 0.35);
}

.strikethrough {
    text-decoration: line-through;
}

.has-note {
    background-color: rgba(255, 99, 71, 0.2); /* Light tomato background */
    cursor: pointer;
}

/* Annotation focus indicator for keyboard navigation */
.annotation-focused {
    outline: 2px solid var(--markon-primary);
    outline-offset: 2px;
    border-radius: 3px;
}

/* Heading section container (generated by Rust renderer) */
.heading-section {
    position: relative;
    /* Add scroll offset so headings don't stick to top edge */
    scroll-margin-top: 40px;
    /* Border always exists to prevent layout shift */
    border: 2px solid transparent;
    border-radius: 4px;
    padding: 4px 8px;
    padding-bottom: 5px;
}

/* Change border color when heading inside is focused */
.heading-section:has(.heading-focused) {
    border-color: color-mix(in srgb, var(--markon-primary) 30%, transparent);
}

html[data-theme="dark"] .heading-section:has(.heading-focused) {
    border-color: color-mix(in srgb, var(--markon-primary) 40%, transparent);
}

/* Headings use negative margin to align with container border */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    position: relative;
    margin-top: -4px;
    margin-left: -8px;
    margin-right: -8px;
    padding: 4px 8px;
}

/* Hierarchical indentation for wide screens (>= 1400px) */
@media (min-width: 1400px) {
    .heading-section { padding: 12px 12px 0 12px; }

    /* Adjust heading margins to match wider container padding */
    .markdown-body h1,
    .markdown-body h2,
    .markdown-body h3,
    .markdown-body h4,
    .markdown-body h5,
    .markdown-body h6 {
        margin-top: -14px;
        margin-left: -14px;
        margin-right: -14px;
        padding: 12px;
    }
}

/* Apply background to focused heading only (not content) */
.markdown-body h1.heading-focused,
.markdown-body h2.heading-focused,
.markdown-body h3.heading-focused,
.markdown-body h4.heading-focused,
.markdown-body h5.heading-focused,
.markdown-body h6.heading-focused {
    background-color: color-mix(in srgb, var(--markon-primary) 10%, transparent);
    /* Specificity (0,2,2) beats github-markdown's `.markdown-body h2` (0,1,1). */
    border-bottom: none;
    border-radius: 4px;
}

html[data-theme="dark"] .markdown-body h1.heading-focused,
html[data-theme="dark"] .markdown-body h2.heading-focused,
html[data-theme="dark"] .markdown-body h3.heading-focused,
html[data-theme="dark"] .markdown-body h4.heading-focused,
html[data-theme="dark"] .markdown-body h5.heading-focused,
html[data-theme="dark"] .markdown-body h6.heading-focused {
    background-color: color-mix(in srgb, var(--markon-primary) 15%, transparent);
}

/* ============================================================
   NOTE INPUT MODAL
   Popup dialog for entering/editing note text
   ============================================================ */

.note-input-modal {
    position: absolute;
    z-index: var(--markon-z-modal-inline);
    background: var(--markon-canvas);
    border: 1px solid var(--markon-border-strong);
    border-radius: 8px;
    padding: 12px;
    box-shadow: 0 8px 24px rgba(140, 149, 159, 0.2);
    width: 360px;
}

.note-textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--markon-border-strong);
    border-radius: 6px;
    font-size: 14px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
    resize: vertical;
    min-height: 80px;
    margin-bottom: 12px;
    box-sizing: border-box;
}

.note-textarea:focus {
    outline: none;
    border-color: var(--markon-primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--markon-primary) 10%, transparent);
}

.note-input-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.note-input-actions button {
    padding: 6px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid var(--markon-border-strong);
    background: var(--markon-canvas);
    color: var(--markon-text);
    transition: all 0.1s;
}

.note-input-actions button:hover {
    background: var(--markon-subtle);
}

/* Specificity raised to `.note-input-actions button.note-save` (0,3,1) so it
   beats the earlier `.note-input-actions button` (0,2,0) generic style. */
.note-input-actions button.note-save {
    background: #2da44e;
    color: white;
    border-color: #2da44e;
}

.note-input-actions button.note-save:hover {
    background: #2c974b;
}

/* ============================================================
   NOTE MARGIN CARDS
   Sidebar notes displayed on the right side of content
   ============================================================ */

.note-card-margin {
    position: absolute;
    width: 280px; /* Match TOC width */
    padding: 12px 16px;
    background: var(--markon-subtle);
    border-left: 3px solid var(--markon-primary); /* Left border for symmetry with TOC */
    border-radius: 6px;
    font-size: 13px;
    line-height: 1.6;
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    z-index: var(--markon-z-note-card);
    box-sizing: border-box;
}

.note-card-margin:hover {
    background: color-mix(in srgb, var(--markon-primary) 10%, var(--markon-canvas));
    border-left-color: var(--markon-primary-hover);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.note-card-margin.highlight-active {
    background: color-mix(in srgb, var(--markon-primary) 12%, var(--markon-canvas));
    border-left-color: var(--markon-primary-hover);
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--markon-primary) 25%, transparent),
                0 2px 8px rgba(0, 0, 0, 0.1);
}

/* ============================================================
   NOTE CONNECTOR
   Dashed S-curve linking the active source highlight to its card
   ============================================================ */

.note-connector-svg {
    z-index: var(--markon-z-note-connector); /* below note cards, above text */
}

.note-connector-path {
    fill: none;
    stroke: var(--markon-primary);
    stroke-width: 1.4;
    stroke-linecap: round;
    stroke-dasharray: 5 4;
    opacity: 0;
    transition: opacity 180ms ease;
}

.note-connector-path.is-visible {
    opacity: 0.7;
    animation: markon-note-connector-dash 12s linear infinite;
}

@keyframes markon-note-connector-dash {
    to { stroke-dashoffset: -180; }
}

/* ============================================================
   NOTE ACTION BUTTONS
   Edit and delete buttons for note cards
   ============================================================ */

.note-actions {
    position: absolute;
    top: 8px;
    right: 8px;
    display: flex;
    gap: 4px;
}

.note-edit,
.note-delete {
    width: 20px;
    height: 20px;
    border: none;
    color: white;
    border-radius: 50%;
    font-size: 14px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.7;
    transition: opacity 0.2s, transform 0.2s;
    padding: 0;
}

.note-edit {
    background: var(--markon-primary);
}

.note-edit:hover {
    opacity: 1;
    transform: scale(1.1);
}

.note-delete {
    background: #dc3545;
}

.note-delete:hover {
    opacity: 1;
    transform: scale(1.1);
}

.note-content {
    color: var(--markon-text);
    white-space: pre-wrap;
    word-wrap: break-word;
    padding-right: 52px; /* Make room for edit and delete buttons */
}

/* ============================================================
   CONFIRM DIALOG
   Small confirmation popup for destructive actions
   ============================================================ */

.confirm-dialog {
    position: fixed;
    background: var(--markon-canvas);
    border: 1px solid var(--markon-border-strong);
    border-radius: 6px;
    padding: 10px 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: var(--markon-z-chrome);
    min-width: 180px;
    max-width: 250px;
}

.confirm-message {
    margin: 0 0 10px 0;
    font-size: 13px;
    color: var(--markon-text);
    line-height: 1.4;
}

.confirm-actions {
    display: flex;
    justify-content: flex-end;
    gap: 6px;
}

.confirm-actions button {
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid var(--markon-border-strong);
    background: var(--markon-canvas);
    color: var(--markon-text);
    transition: all 0.1s;
}

.confirm-actions button:hover {
    background: var(--markon-subtle);
}

/* Specificity raised to `.confirm-actions button.confirm-ok` (0,3,1) so it
   beats the earlier `.confirm-actions button` (0,2,0) generic style. */
.confirm-actions button.confirm-ok {
    background: #dc3545;
    color: white;
    border-color: #dc3545;
}

.confirm-actions button.confirm-ok:hover {
    background: #c82333;
}

/* ============================================================
   HAS-NOTE HIGHLIGHT INTERACTIONS
   Styling for text elements with attached notes
   ============================================================ */

.has-note {
    background-color: rgba(255, 99, 71, 0.2);
    cursor: pointer;
    border-bottom: 2px dotted rgba(255, 99, 71, 0.5);
    transition: all 0.2s;
}

.has-note:hover {
    background-color: rgba(255, 99, 71, 0.35);
    border-bottom-color: rgba(255, 99, 71, 0.8);
}

.has-note.highlight-active {
    background-color: color-mix(in srgb, var(--markon-primary) 20%, transparent);
    border-bottom: 2px solid var(--markon-primary);
    box-shadow: 0 0 0 2px color-mix(in srgb, var(--markon-primary) 10%, transparent);
}

/* ============================================================
   NOTE POPUP (Mobile)
   Floating note display for narrow screens
   ============================================================ */

.note-popup {
    position: fixed;
    max-width: 300px;
    background: var(--markon-subtle);
    border: 1px solid var(--markon-primary);
    border-radius: 6px;
    padding: 12px 16px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: var(--markon-z-modal);
    font-size: 13px;
    line-height: 1.6;
    cursor: default;
}

/* ============================================================
   TABLE OF CONTENTS (Mobile)
   Floating TOC button and menu for narrow screens
   ============================================================ */

#toc-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: var(--markon-z-chrome);
}

@media (max-width: 768px) {
    #toc-container {
        right: 10px;
    }
}

/* Collapsed TOC icon = 40×40 circle. When .active is toggled, the icon
   morphs into a close (X) button pinned at the menu's top-right rounded
   corner — same surface, same border, geometry is the only thing changing
   (mirror of how the Live sphere morphs into its panel). */
#toc-icon {
    width: 40px;
    height: 40px;
    background-color: var(--markon-elevated);
    border-radius: 50%;
    cursor: pointer;
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    /* 2.5px border matches the Live sphere's "off" stroke width — same
       visual weight across all three floating-layer family members
       (ToC, Live, Chat). */
    border: 2.5px solid var(--markon-border-strong);
    box-sizing: border-box;
}

#toc-icon .toc-bar {
    display: block;
    width: 16px;
    height: 1.5px;
    background-color: var(--markon-text);
    margin: 1.5px 0;
}

#toc-icon .toc-close {
    display: none;
    color: var(--markon-text);
    pointer-events: none;
    transition: transform 0.35s ease;
}

/* Hover spin on the X when TOC is open — same playful affordance as the
   Live panel's close button. Rotation is on the icon only; the 40×40 hit
   area on #toc-icon is untouched. */
#toc-container.active #toc-icon:hover .toc-close {
    transform: rotate(180deg);
}

/* Mobile TOC styles */
@media (max-width: 1400px) {
    #toc-icon {
        display: flex;
    }

    /* Specificity raised to (1,1,0) via `#toc-container` so this overrides
       the (0,1,0) `.toc` rule that layout.html declares for the same media
       range (position: relative; margin-bottom: 30px; max-width: 100%). */
    #toc-container .toc {
        display: none;
        position: absolute;
        top: 0;
        right: 0;
        left: auto;
        width: 280px;
        max-width: 280px;
        margin-bottom: 0;
        max-height: calc(100vh - 40px);
        overflow-y: auto;
        background-color: var(--markon-elevated);
        border: 2.5px solid var(--markon-border-strong);
        border-radius: 20px;
        overscroll-behavior: contain;
        box-sizing: border-box;
    }

    #toc-container.active .toc {
        display: block;
    }

    /* Icon stays visible but becomes the menu's rounded top-right corner.
       The menu owns the border in the expanded state — drop the icon's own
       border so the two don't double up at the TR corner. */
    #toc-container.active #toc-icon {
        position: absolute;
        top: 0;
        right: 0;
        z-index: var(--markon-z-content-overlay);
        border-radius: 0 20px 0 0;
        background-color: transparent;
        border: none;
    }
    #toc-container.active #toc-icon .toc-bar { display: none; }
    #toc-container.active #toc-icon .toc-close { display: block; }
}

/* TOC styles are now fully controlled by layout.html template based on --theme parameter.
   Do not add @media (prefers-color-scheme) rules here as they would override --theme light/dark. */

/* ============================================================
   SECTION VIEWED FEATURE
   GitHub PR-style "Viewed" checkboxes for sections
   ============================================================ */

.viewed-checkbox-label {
    margin-left: 0.75rem;
    font-size: var(--markon-ui-font-size);
    font-family: var(--markon-ui-font);
    font-weight: normal;
    color: var(--markon-muted);
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    vertical-align: middle;
    transition: opacity 0.2s;
    /* Prevent triggering annotation toolbar */
    pointer-events: auto;
}

.viewed-checkbox-label:hover {
    opacity: 0.8;
}

.viewed-checkbox {
    cursor: pointer;
    width: 15px;
    height: 15px;
    margin: 0;
    vertical-align: middle;
}

.viewed-text {
    /* All common styles inherited from .section-action */
}

/* Common section action button style */
.section-action {
    font-size: var(--markon-ui-font-size);
    font-family: var(--markon-ui-font);
    color: var(--markon-muted);
    font-weight: normal;
    cursor: pointer;
    margin-left: 0.5em;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    vertical-align: middle;
    transition: opacity 0.2s;
    pointer-events: auto;
}

.section-action:hover {
    opacity: 0.7;
    text-decoration: underline;
}

/* Section action that immediately follows a separator needs no extra left margin */
.section-action-separator + .section-action {
    margin-left: 0;
}

/* Section action separator */
.section-action-separator {
    margin: 0 0.25rem;
    font-size: var(--markon-ui-font-size);
    color: var(--markon-muted);
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    vertical-align: middle;
}

/* Print section container - hidden by default */
.print-section-container {
    display: none;
}

/* Collapsed section styles */
.section-collapsed {
    cursor: pointer;
    opacity: var(--markon-collapsed-opacity);
    transition: opacity 0.2s ease;
    position: relative;
}

.section-collapsed:hover {
    opacity: var(--markon-collapsed-opacity-hover);
}

/* Expand/collapse toggle button - inherits from .section-action */
/* Note: Additional specific class kept for potential future customization */
.section-expand-toggle {
    /* All common styles are inherited from .section-action */
}

/* Temporarily expanded section (viewed but expanded) */
.section-collapsed.section-temp-expanded {
    opacity: 1;
}

/* Placeholder row shown below a collapsed heading */
.section-collapsed-placeholder {
    cursor: pointer;
    padding: 4px 10px;
    margin: 2px 0 12px;
    font-size: 12px;
    color: var(--color-fg-muted, #6e7781);
    font-style: italic;
    opacity: 0.65;
    transition: opacity 0.15s ease, background 0.15s ease;
    border-radius: 4px;
    -webkit-user-select: none;
    user-select: none;
}
.section-collapsed-placeholder::before {
    content: "⋯ ";
    margin-right: 4px;
    letter-spacing: 1px;
}
.section-collapsed-placeholder:hover {
    opacity: 1;
    background: var(--color-neutral-muted, rgba(175,184,193,0.15));
}

/* Hide section content when collapsed with smooth animation.
   Specificity raised to (0,2,0) via `.markdown-body` so margin / padding
   zero-out beats github-markdown's `.markdown-body p|ul|ol|table|pre` rules
   (each 0,1,1). The element this class lands on is a direct child of
   .markdown-body so the descendant combinator is sufficient. */
.markdown-body .section-content-hidden {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    margin-bottom: 0;
    padding-top: 0;
    padding-bottom: 0;
    overflow: hidden;
    /* Collapse: fade out quickly, then shrink height */
    transition: opacity 0.2s ease-out, max-height 0.35s ease-out 0.05s, margin 0.35s ease-out 0.05s, padding 0.35s ease-out 0.05s;
}

/* Show content when temporarily expanded (controlled by JS).
   Same specificity-raise logic as `.section-content-hidden` above. */
.markdown-body .section-content-temp-visible {
    max-height: 10000px;
    opacity: 1;
    /* Expand: completely reverse of collapse - expand height, and fade in with 0.05s delay */
    transition: max-height 0.35s ease-out, margin 0.35s ease-out, padding 0.35s ease-out, opacity 0.2s ease-out 0.05s;
}

/* Add transition to elements that might be collapsed (performance optimization) */
.markdown-body > * {
    transition: opacity 0.2s ease-out, max-height 0.35s ease-out, margin 0.35s ease-out, padding 0.35s ease-out;
}

/* Dark theme adjustments — handled automatically by --markon-muted token */


/* ============================================================
   VIEWED TOOLBAR
   Lightweight text-based controls for viewed sections (inline in H1)
   ============================================================ */

.viewed-toolbar {
    margin-left: 0.75rem;
    font-size: var(--markon-ui-font-size);
    font-family: var(--markon-ui-font);
    font-weight: normal;
    color: var(--markon-muted);
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    vertical-align: middle;
}

.viewed-toolbar a {
    color: var(--markon-primary);
    text-decoration: none;
    cursor: pointer;
    padding: 2px 4px;
    transition: color 0.2s;
    font-size: 0.8125rem;
}

.viewed-toolbar a:hover {
    text-decoration: underline;
    opacity: 0.8;
}

.viewed-toolbar-separator {
    color: var(--markon-muted);
    margin: 0 4px;
    font-size: var(--markon-ui-font-size);
}

/* Dark theme adjustments — now handled by CSS variables above */

/* ============================================================
   TOC VIEWED STATE HIGHLIGHTING
   Highlight TOC items based on viewed state
   ============================================================ */

/* `.toc-item.viewed > a` is (0,3,0); beats layout.html's `.toc-item a` (0,2,0)
   on specificity, so no !important is needed. The dark variants add an
   attribute selector for theme switching. */
.toc-item.viewed > a {
    color: #2da44e;
    font-weight: 500;
}

.toc-item.viewed > a:hover {
    color: #2c974b;
}

/* Dark theme adjustments for TOC viewed state */
html[data-theme="dark"] .toc-item.viewed > a {
    color: #3fb950;
    font-weight: 500;
}

html[data-theme="dark"] .toc-item.viewed > a:hover {
    color: #56d364;
}

/* ============================================================
   TOC Keyboard Navigation Focus Styles
   ============================================================ */

/* Keyboard focus (destination) - hollow border, no background */
.toc-item a.toc-focused {
    outline: 2px solid var(--markon-primary);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Current page position - solid background (already defined in layout.html) */
/* .toc-item a.active has solid background */

/* Note: TOC navigation active border styles are defined in layout.html template
   to match the theme setting (dark/light/auto) */

/* ============================================================
   TOC Collapse/Expand Indicators
   ============================================================ */

.toc-collapse-indicator {
    display: inline-block;
    width: 1em;
    font-size: 0.75em;
    opacity: 0.6;
    user-select: none;
}

/* ============================================================
   PRINT STYLES
   Hide viewed UI elements when printing.
   All `!important` declarations inside this block are intentional:
   print rules must force-override the screen cascade (including
   github-markdown.css and the inline <style> rules in layout.html)
   so layout doesn't leak into printed output.
   ============================================================ */

@media print {
    /* When printing a specific section, hide everything else */
    /* With unique marker IDs in cloned SVG, we can safely use display:none */
    body:has(.print-section-container) > *:not(.print-section-container) {
        display: none !important;
    }

    /* Show only the print section container */
    .print-section-container {
        display: block !important;
    }

    /* Hide interactive elements in print section container */
    .print-section-container .section-action-separator,
    .print-section-container .section-print-btn {
        display: none !important;
    }

    /* Hide viewed checkboxes and labels */
    .viewed-checkbox-label {
        display: none !important;
    }

    /* Hide expand/collapse toggle */
    .section-expand-toggle {
        display: none !important;
    }

    /* Hide viewed toolbar */
    .viewed-toolbar {
        display: none !important;
    }

    /* Remove collapsed state - show all content when printing */
    .section-collapsed {
        opacity: 1 !important;
        cursor: default !important;
    }

    .section-content-hidden {
        max-height: none !important;
        opacity: 1 !important;
        margin: inherit !important;
        padding: inherit !important;
    }

    /* Reset heading section for print */
    .heading-section {
        padding: 0 !important;
        border: none !important;
    }

    /* Reset heading margins for print */
    .markdown-body h1,
    .markdown-body h2,
    .markdown-body h3,
    .markdown-body h4,
    .markdown-body h5,
    .markdown-body h6 {
        margin-top: 0 !important;
        margin-left: 0 !important;
        margin-right: 0 !important;
        padding: 0 !important;
    }

    /* Remove TOC viewed highlighting in print */
    .toc-item.viewed > a {
        color: inherit !important;
        font-weight: normal !important;
    }
}

/* ============================================================
   KEYBOARD SHORTCUTS HELP PANEL
   Gmail-style modal overlay for displaying shortcuts
   ============================================================ */

.shortcuts-help-panel {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: var(--markon-z-chrome);
    align-items: center;
    justify-content: center;
}

.shortcuts-help-panel.visible {
    display: flex;
}

.shortcuts-help-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
}

.shortcuts-help-modal {
    position: relative;
    background: var(--markon-canvas);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    max-width: 750px;
    max-height: 85vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.shortcuts-help-header {
    padding: 0px 18px;
    border-bottom: 1px solid var(--markon-border-strong);
    background: var(--markon-subtle);
}

.shortcuts-help-content {
    padding: 14px 18px;
    overflow-y: auto;
    flex: 1;
}

.shortcuts-category {
    margin-bottom: 16px;
}

.shortcuts-category:last-child {
    margin-bottom: 0;
}

.shortcuts-category h3 {
    margin: 0 0 8px 0;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--markon-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.shortcuts-list {
    display: block;
}

.shortcut-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4px 0;
    gap: 16px;
}

.shortcut-key {
    flex-shrink: 0;
    min-width: 140px;
    white-space: nowrap;
    text-align: left;
}

.shortcut-desc {
    flex: 1;
    color: var(--markon-text);
    font-size: 0.8rem;
    line-height: 1.4;
    text-align: right;
}

.shortcut-key kbd {
    display: inline-block;
    padding: 2px 6px;
    font-family: 'SFMono-Regular', 'Consolas', 'Liberation Mono', 'Menlo', monospace;
    font-size: 0.7rem;
    color: var(--markon-text);
    background: var(--markon-subtle);
    border: 1px solid var(--markon-border-strong);
    border-radius: 3px;
    box-shadow: inset 0 -1px 0 var(--markon-border-strong);
    margin-right: 3px;
}

.shortcuts-help-footer {
    padding: 10px 18px;
    border-top: 1px solid var(--markon-border-strong);
    background: var(--markon-subtle);
    text-align: center;
    font-size: 0.75rem;
    color: var(--markon-muted);
}

.shortcuts-help-footer kbd {
    display: inline-block;
    padding: 2px 5px;
    font-family: 'SFMono-Regular', 'Consolas', 'Liberation Mono', 'Menlo', monospace;
    font-size: 0.7rem;
    color: var(--markon-text);
    background: var(--markon-canvas);
    border: 1px solid var(--markon-border-strong);
    border-radius: 3px;
    margin: 0 2px;
}

/* Responsive: single column on smaller screens */
@media (max-width: 768px) {
    .shortcuts-help-content {
        grid-template-columns: 1fr;
    }

    .shortcuts-help-modal {
        max-width: 95%;
    }
}

/* Dark theme: shortcut modal surfaces/text/borders are driven by tokens
   defined at the top of this file. Only this shadow is dark-only because
   it needs more depth on a dark canvas. */
html[data-theme="dark"] .shortcuts-help-modal {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.6);
}

/* Print: hide shortcuts panel */
@media print {
    .shortcuts-help-panel {
        display: none !important;
    }
}

/* Highlight flash animation for navigation */
@keyframes highlight-flash {
    0% {
        background-color: transparent;
        box-shadow: none;
    }
    50% {
        background-color: rgba(255, 223, 0, 0.3);
        box-shadow: 0 0 8px rgba(255, 223, 0, 0.5);
    }
    100% {
        background-color: transparent;
        box-shadow: none;
    }
}

.highlight-flash {
    animation: highlight-flash 1s ease-in-out;
}

/* ============================================================
   EDITOR MODAL
   Minimalist Markdown source editor with line numbers
   ============================================================ */

.editor-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--markon-z-chrome);
    background-color: #1e1e1e;
    display: flex;
    flex-direction: column;
}

/* Header */
.editor-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 20px;
    background-color: #2d2d2d;
    border-bottom: 1px solid #3e3e3e;
}

.editor-close {
    background: none;
    border: none;
    color: #cccccc;
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
    line-height: 1;
    transition: color 0.2s;
    flex-shrink: 0;
}

.editor-close:hover {
    color: #ffffff;
}

.editor-file-name {
    flex: 1;
    font-family: monospace;
    color: #ffffff;
    font-size: 14px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Body */
.editor-body {
    flex: 1;
    overflow: hidden;
    min-height: 0;
}

/* Split layout */
.editor-split {
    display: flex;
    height: 100%;
    overflow: hidden;
    --editor-split-left: 50%;
}

.editor-pane {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
}

.editor-pane-source {
    width: var(--editor-split-left);
    flex-shrink: 0;
}

.editor-pane-preview {
    flex: 1;
    overflow-y: auto;
    background-color: var(--markon-canvas);
}

.editor-split-divider {
    width: 5px;
    flex-shrink: 0;
    background-color: #3e3e3e;
    cursor: col-resize;
    transition: background-color 0.15s;
}

.editor-split-divider:hover,
.editor-split-divider:active {
    background-color: #0e639c;
}

/* Preview content: reset body styles, use markdown-body */
.editor-preview-content {
    padding: 20px 24px;
    box-sizing: border-box;
    min-height: 100%;
    background-color: var(--markon-canvas);
    color: var(--markon-text);
}

/* Narrow-screen tab bar */
.editor-tab-bar {
    display: none;
    gap: 0;
}

.editor-tab {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: #cccccc;
    font-size: 13px;
    padding: 4px 14px;
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s;
}

.editor-tab:hover {
    color: #ffffff;
}

.editor-tab.active {
    color: #ffffff;
    border-bottom-color: #0e639c;
}

.editor-container {
    display: flex;
    height: 100%;
    overflow: hidden;
}

/* Line numbers gutter */
.editor-line-numbers {
    flex-shrink: 0;
    width: 50px;
    overflow-y: hidden;
    overflow-x: hidden;
    background-color: #1e1e1e;
    border-right: 1px solid #3e3e3e;
    padding: 0;
    user-select: none;
    text-align: right;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    color: #858585;
}

.editor-line-number {
    padding-right: 12px;
    height: 22.4px; /* Match line-height of textarea (14px * 1.6) */
}

/* Text container (holds both highlight layer and textarea) */
.editor-text-container {
    flex: 1;
    position: relative;
    height: 100%;
    overflow: hidden;
}

/* Highlight layer (background, with syntax coloring) */
.editor-highlight-layer {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: 0;
    padding: 0 0 0 12px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-y: auto;
    overflow-x: auto;
    pointer-events: none;
    background-color: #1e1e1e;
    color: #d4d4d4;
    tab-size: 4;
    scrollbar-width: none; /* Firefox */
}

.editor-highlight-layer::-webkit-scrollbar {
    display: none; /* Chrome/Safari */
}

.editor-highlight-layer code {
    display: block;
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    white-space: inherit;
    word-wrap: inherit;
}

/* Textarea (foreground, transparent) */
.editor-textarea {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: transparent;
    color: transparent;
    caret-color: #ffffff;
    border: none;
    outline: none;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    padding: 0 0 0 12px;
    resize: none;
    tab-size: 4;
    overflow-y: auto;
    overflow-x: auto;
}

.editor-textarea::selection {
    background-color: rgba(38, 79, 120, 0.6);
    color: transparent;
}

/* Markdown syntax highlighting colors */
.md-header {
    color: #569cd6;
    font-weight: bold;
}

.md-header-text {
    color: #4ec9b0;
    font-weight: bold;
}

.md-bold {
    color: #dcdcaa;
    font-weight: bold;
}

.md-italic {
    color: #ce9178;
    font-style: italic;
}

.md-code {
    color: #d16969;
    background-color: rgba(255, 255, 255, 0.1);
}

.md-code-fence {
    color: #808080;
}

.md-link {
    color: #3794ff;
}

.md-image {
    color: #c586c0;
}

.md-quote {
    color: #6a9955;
}

.md-list {
    color: #dcdcaa;
}

.md-hr {
    color: #808080;
}


.editor-save-btn {
    background-color: #0e639c;
    color: #ffffff;
    border: none;
    padding: 6px 16px;
    font-size: 13px;
    cursor: pointer;
    border-radius: 2px;
    transition: background-color 0.2s;
    flex-shrink: 0;
}

.editor-save-btn:hover {
    background-color: #1177bb;
}

.editor-save-btn:active {
    background-color: #0d5a8f;
}

.editor-save-btn:disabled {
    background-color: #4d4d4d;
    color: #808080;
    cursor: not-allowed;
}

.editor-save-btn.has-changes {
    background-color: #0e7a0d;
}

.editor-save-btn.has-changes:hover {
    background-color: #13a10e;
}

/* Auto theme (prefers-color-scheme) */
@media (prefers-color-scheme: light) {
    .editor-modal {
        background-color: var(--markon-canvas);
    }

    .editor-header {
        background-color: #f3f3f3;
        border-color: #e0e0e0;
    }

    .editor-close {
        color: #333333;
    }

    .editor-close:hover {
        color: #000000;
    }

    .editor-file-name {
        color: #000000;
    }

    .editor-line-numbers {
        background-color: var(--markon-subtle);
        border-right-color: var(--markon-border-strong);
        color: var(--markon-muted);
    }

    .editor-highlight-layer {
        background-color: var(--markon-canvas);
        color: var(--markon-text);
    }

    .editor-textarea {
        background-color: transparent;
        color: transparent;
        caret-color: var(--markon-text);
    }

    /* Light theme syntax colors */
    .md-header {
        color: #0550ae;
    }

    .md-header-text {
        color: #0a3069;
    }

    .md-bold {
        color: #8250df;
    }

    .md-italic {
        color: #cf222e;
    }

    .md-code {
        color: #a40e26;
        background-color: rgba(175, 184, 193, 0.2);
    }

    .md-code-fence {
        color: #57606a;
    }

    .md-link {
        color: #0969da;
    }

    .md-image {
        color: #8250df;
    }

    .md-quote {
        color: #1a7f37;
    }

    .md-list {
        color: #8250df;
    }

    .md-hr {
        color: #57606a;
    }

    .editor-textarea::selection {
        background-color: #add6ff;
    }

    .editor-status {
        color: var(--markon-muted);
    }

    /* Light preview pane stays white regardless of color-scheme */
    .editor-preview-content {
        background-color: var(--markon-canvas);
        color: var(--markon-text);
    }

    .editor-pane-preview {
        background-color: var(--markon-canvas);
    }
}

/* ============================================================
   EDITOR LAYOUT TOGGLE
   Segmented control for split ↔ full-width layout
   ============================================================ */

.editor-layout-toggle {
    display: flex;
    align-items: center;
    gap: 1px;
    background: none;
    border-radius: 4px;
    padding: 0;
    flex-shrink: 0;
}

.editor-layout-btn {
    background: none;
    border: 1px solid transparent;
    color: #777777;
    padding: 4px 7px;
    cursor: pointer;
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.15s, background-color 0.15s, border-color 0.15s;
    line-height: 1;
}

.editor-layout-btn:hover {
    color: #aaaaaa;
    background-color: rgba(255, 255, 255, 0.06);
    border-color: transparent;
}

.editor-layout-btn.active {
    color: #4dabf7;
    background-color: rgba(14, 99, 156, 0.15);
    border-color: rgba(14, 99, 156, 0.6);
}

/* Light theme overrides */
@media (prefers-color-scheme: light) {
    .editor-layout-toggle {
        background: none;
    }

    .editor-layout-btn {
        color: #888888;
        border-color: transparent;
    }

    .editor-layout-btn:hover {
        color: #444444;
        background-color: rgba(0, 0, 0, 0.06);
        border-color: transparent;
    }

    .editor-layout-btn.active {
        color: #0e639c;
        background-color: rgba(14, 99, 156, 0.10);
        border-color: rgba(14, 99, 156, 0.5);
    }
}

/* Dark theme (html[data-theme="dark"]) */
html[data-theme="dark"] .editor-layout-toggle {
    background: none;
}

html[data-theme="dark"] .editor-layout-btn {
    color: #6e7681;
    border-color: transparent;
}

html[data-theme="dark"] .editor-layout-btn:hover {
    color: #b0b8c1;
    background-color: rgba(240, 246, 252, 0.06);
    border-color: transparent;
}

html[data-theme="dark"] .editor-layout-btn.active {
    color: #79c0ff;
    background-color: rgba(31, 111, 235, 0.15);
    border-color: rgba(31, 111, 235, 0.5);
}

/* ============================================================
   RESPONSIVE: narrow screens (≤768px)
   Single pane + top tab bar
   ============================================================ */
@media (max-width: 768px) {
    .editor-tab-bar {
        display: flex;
    }

    /* Hide layout toggle on narrow screens — tab bar takes over */
    .editor-layout-toggle {
        display: none;
    }

    .editor-split {
        flex-direction: column;
    }

    .editor-split-divider {
        display: none;
    }

    .editor-pane-source {
        width: 100%;
        flex: 1;
    }

    .editor-pane-preview {
        flex: 1;
        display: none; /* shown via JS when tab=preview */
    }
}

/* ============================================================
   DARK THEME: preview pane / split / tab overrides
   Preview canvas + text are driven by --markon-canvas / --markon-text
   tokens (see :root + html[data-theme="dark"] at top of file). The
   rules below remain dark-only because the *light* IDE chrome
   (split-divider, tab) intentionally uses VS Code chrome colors.
   ============================================================ */
html[data-theme="dark"] .editor-split-divider {
    background-color: var(--markon-border);
}

html[data-theme="dark"] .editor-split-divider:hover,
html[data-theme="dark"] .editor-split-divider:active {
    background-color: var(--markon-primary);
}

html[data-theme="dark"] .editor-tab {
    color: var(--markon-muted);
}

html[data-theme="dark"] .editor-tab:hover {
    color: var(--markon-text);
}

html[data-theme="dark"] .editor-tab.active {
    color: var(--markon-text);
    border-bottom-color: var(--markon-primary);
}