vivac 0.6.4

/* `WEB.md` §5: one binary, no build step. This is embedded with `include_str!`
   and inlined into a <style>, because the CSP admits `style-src 'unsafe-inline'`
   and no external stylesheet at all. It lives in its own file rather than in a
   `format!` because nobody maintains two hundred lines of CSS inside a string
   literal.

   Nothing here is the only thing carrying a meaning. The DX pillar says meaning
   is never encoded in colour alone, so every state that matters is also a word
   and a position: colour repeats what the text already said, and a reader with
   no colour at all loses nothing. */

:root {
  --ink: #16181d;
  --ink-soft: #5c626e;
  --ink-faint: #878d99;
  --ground: #fbfaf8;
  --panel: #ffffff;
  --rule: #e2e0db;
  --rule-soft: #eeece8;
  --accent: #2f5d50;
  --warn: #8a4b1f;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Menlo,
    Consolas, monospace;
  --prose: ui-sans-serif, system-ui, "Segoe UI", Inter, Helvetica, Arial,
    sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e6e5e1;
    --ink-soft: #a2a7b2;
    --ink-faint: #767c88;
    --ground: #14161a;
    --panel: #1b1e23;
    --rule: #2c3037;
    --rule-soft: #23272d;
    --accent: #7fbfa9;
    --warn: #d79a63;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 2.5rem 1.5rem 5rem;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--prose);
  font-size: 15px;
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
}

.page {
  max-width: 54rem;
  margin: 0 auto;
}

/* ---- masthead ------------------------------------------------------- */

header {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1.1rem;
  margin-bottom: 2.2rem;
}

header h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

header .promise {
  margin: 0.3rem 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

/* ---- sections ------------------------------------------------------- */

section {
  margin-bottom: 2.6rem;
}

section > h2 {
  margin: 0 0 0.2rem;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--ink-soft);
}

section > .since {
  margin: 0 0 1rem;
  color: var(--ink-faint);
  font-size: 0.85rem;
}

section > h3 {
  margin: 1.4rem 0 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.empty {
  margin: 0;
  color: var(--ink-soft);
  font-style: italic;
}

/* ---- node lists ----------------------------------------------------- */

ul.nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule-soft);
}

ul.nodes > li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 0 0.9rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--rule-soft);
}

.alias {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink-soft);
  padding-top: 0.13rem;
}

.title {
  margin: 0;
}

.note {
  margin: 0.2rem 0 0;
  grid-column: 2;
  color: var(--ink-soft);
  font-size: 0.88rem;
}

/* The word does the work; the rule beside it is a second cue, not the
   first one. */
.note.forced,
.note.flag {
  border-left: 2px solid var(--warn);
  padding-left: 0.55rem;
}

.word {
  font-family: var(--mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

/* ---- the stack ------------------------------------------------------ */

ol.stack {
  list-style: none;
  margin: 0;
  padding: 0;
}

ol.stack > li {
  padding: 0.3rem 0 0.3rem 0;
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 0 0.9rem;
}

ol.stack > li .title {
  border-left: 1px solid var(--rule);
  padding-left: 0.9rem;
}

ol.stack > li.here .title {
  border-left: 2px solid var(--accent);
  font-weight: 600;
}

ol.stack > li.here .here-mark {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-left: 0.5rem;
}

/* ---- the index of projects ------------------------------------------ */

ul.projects {
  list-style: none;
  margin: 0;
  padding: 0;
}

ul.projects > li {
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--rule-soft);
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

a:focus-visible,
a:hover {
  text-decoration-thickness: 2px;
}

/* ---- footer --------------------------------------------------------- */

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  color: var(--ink-faint);
  font-size: 0.82rem;
}

footer code {
  font-family: var(--mono);
}

/* ---- the spine (WEB.md 3.2) ----------------------------------------- */

/* The lineage is drawn with a border and a knot, not with SVG: seven rows
   do not need a drawing surface, the text stays selectable and copyable,
   and nothing has to be measured in JS. `d187`. */

header .crumb {
  margin: 0 0 0.4rem;
  font-size: 0.85rem;
}

/* The way onward, not the way back: it hangs under the promise, so it
   carries its margin on the other side. */
header .onward {
  margin: 0.55rem 0 0;
  font-size: 0.85rem;
}

ol.spine {
  list-style: none;
  margin: 0;
  padding: 0;
}

ol.spine > li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 0 0.9rem;
}

ol.spine > li > .alias {
  padding-top: 0.1rem;
}

ol.spine > li > .what {
  position: relative;
  border-left: 1px solid var(--rule);
  padding: 0 0 1.6rem 1.2rem;
}

/* The line stops at the last step: it is the end of the path, not a
   thread that keeps going. */
ol.spine > li:last-child > .what {
  border-left-color: transparent;
  padding-bottom: 0;
}

/* The knot. A step is a point on the line, and the point is a shape and a
   position before it is a tone. */
ol.spine > li > .what::before {
  content: "";
  position: absolute;
  left: -0.29rem;
  top: 0.42rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--ground);
  border: 1px solid var(--rule);
}

ol.spine > li.here > .what::before {
  background: var(--accent);
  border-color: var(--accent);
  width: 0.62rem;
  height: 0.62rem;
  left: -0.35rem;
}

ol.spine > li.here .title {
  font-weight: 600;
}

ol.spine .title {
  margin: 0;
}

/* The always-visible facts: what this step is, what state it is in, when
   it opened, and how much is still open underneath. Every one of them is a
   word or a number; none of them is only a colour. */
.facts {
  margin: 0.25rem 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0 0.75rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.facts .when,
.facts .anchor {
  font-family: var(--mono);
  font-size: 0.78rem;
}

.count {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
}

/* The weight of a step is its summary, so the click lands where the
   weight is. A step with nothing under it gets no triangle at all. */
ol.spine details {
  margin: 0.3rem 0 0;
}

ol.spine summary {
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  gap: 0 0.75rem;
  padding: 0.1rem 0;
  color: var(--ink-soft);
}

ol.spine summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

ol.spine summary .count {
  color: var(--accent);
}

ol.spine .detail {
  padding: 0.2rem 0 0.4rem;
}

ol.spine .detail h3 {
  margin: 0.7rem 0 0.3rem;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--ink-faint);
}

ol.spine .detail ul.nodes > li {
  grid-template-columns: 3.6rem 1fr;
  padding: 0.35rem 0;
}

/* ---- the global graph (WEB.md 3.6) ----------------------------------- */

/* A row only exists for a node with at least one child; a leaf is only
   ever a tile, in its parent's comb. Nesting reads as indentation, the
   same idiom the spine above uses for depth. `d194`. */

ol.rows {
  list-style: none;
  margin: 0;
  padding: 0;
}

li.row {
  margin: 0 0 1.1rem;
}

li.row .alias {
  margin-right: 0.6rem;
}

li.row .title {
  display: inline;
  margin: 0;
  color: var(--ink-soft);
}

/* `d196`: each block is a disclosure, open by default -- the idiom `d187`
   already fixed for the lineage, same triangle and all. */
li.row > details {
  margin: 0;
}

li.row > details > summary {
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 0.6rem;
}

li.row > details > summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* The fan-out is always in the markup and only ever hidden by CSS: while
   the block is open the comb already shows it, so `d194` still applies;
   the moment the reader closes it, this is what is left of the shape,
   which is `d187`'s argument for its own counts. */
li.row > details[open] > summary .count {
  display: none;
}

li.row > details > ol.rows {
  margin: 0.7rem 0 0;
  padding-left: 1.2rem;
  border-left: 1px solid var(--rule);
}

/* The comb: one tile per direct child, in tree order. Its width carries
   the fan-out -- nothing here counts it into a number. */
.comb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin: 0.4rem 0 0;
}

.tile {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--rule);
  border-radius: 0.25rem;
  background: var(--panel);
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.76rem;
  text-decoration: none;
}

.tile:hover,
.tile:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

/* Meaning is never colour alone: closed strikes through and parked dashes
   the border and italicises, and both also spell the state as a word in
   `title` (DX pillar). */
.tile.closed {
  text-decoration: line-through;
}

.tile.parked {
  border-style: dashed;
  font-style: italic;
}