/* The zenfmt site (ZDS 0015, Original visual language).
 *
 * Semantic tokens rather than page-specific rules, so the same stylesheet
 * dresses a generated page and a Typst-generated chapter without either
 * knowing about the other.
 *
 * Colour is never the only carrier of meaning here: a callout states its kind
 * in words, a status says what it is, and the syntax-highlighting classes
 * below exist so Typst's inline colours can be lifted out of the markup —
 * which is what lets the content policy forbid inline style outright.
 */

:root {
  color-scheme: light;
  --paper: #fbfaf7;
  --panel: #f3f5f7;
  --ink: #151515;
  --muted: #667085;
  --rule: #d7dee8;
  --blue: #2854d7;
  --blue-light: #e8efff;
  --green: #16794b;
  --amber: #a15c00;
  --red: #9f3030;
  --code-bg: #f7f9fc;
  --measure: 72ch;
}

:root.theme-dark {
  color-scheme: dark;
  --paper: #16181d;
  --panel: #1e2128;
  --ink: #e8eaee;
  --muted: #9aa4b2;
  --rule: #2d323b;
  --blue: #a9c4ff;
  --blue-light: #1c2333;
  --green: #87d7ac;
  --amber: #e0b063;
  --red: #f2a2a2;
  --code-bg: #14161b;
}

@media (prefers-color-scheme: dark) {
  :root.theme-system {
    color-scheme: dark;
    --paper: #16181d;
    --panel: #1e2128;
    --ink: #e8eaee;
    --muted: #9aa4b2;
    --rule: #2d323b;
    --blue: #a9c4ff;
    --blue-light: #1c2333;
    --green: #87d7ac;
    --amber: #e0b063;
    --red: #f2a2a2;
    --code-bg: #14161b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.62 Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

main {
  max-width: 1600px;
  margin: 0 auto;
  padding: 2.5rem clamp(1rem, 3vw, 3rem) 5rem;
}

main p, main li { max-width: var(--measure); }

a { color: var(--blue); }

.skip-link {
  position: absolute;
  left: -9999px;
  background: var(--blue);
  color: #fff;
  padding: 0.6rem 1rem;
}
.skip-link:focus { left: 0; top: 0; z-index: 10; }

/* A focus ring that is always visible: an invisible one is the same as none
 * for anyone navigating by keyboard. */
:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

.site-header {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem clamp(1rem, 3vw, 3rem);
  border-bottom: 1px solid var(--rule);
  background: var(--panel);
}
.site-mark {
  font-size: 1.2rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  text-decoration: none;
  color: var(--ink);
}
.site-header nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-header [aria-current="page"] { font-weight: 700; text-decoration: underline; }
.site-tools {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}
.search-label, .theme-label, .language-label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}
.site-search {
  width: clamp(11rem, 22vw, 20rem);
  min-height: 42px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 0 0.8rem;
  background: var(--paper);
  color: var(--ink);
}
.theme-select, .language-select {
  min-height: 44px;
  padding: 0 0.65rem;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
}
.search-results {
  position: absolute;
  z-index: 20;
  top: calc(100% + 0.35rem);
  right: clamp(1rem, 3vw, 3rem);
  width: min(32rem, calc(100vw - 2rem));
  max-height: 28rem;
  overflow: auto;
  padding: 0.65rem;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--paper);
  box-shadow: 0 18px 50px rgb(15 23 42 / 18%);
}
.search-results ul { list-style: none; margin: 0; padding: 0; }
.search-results li { padding: 0.6rem; border-bottom: 1px solid var(--rule); }
.search-results li:last-child { border-bottom: 0; }
.search-results a { display: block; font-weight: 750; }
.search-results span { display: block; color: var(--muted); font-size: 0.85rem; }

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 1.5rem 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

h1 { font-size: clamp(2.2rem, 1.2rem + 3vw, 4.25rem); line-height: 1.02; letter-spacing: -0.055em; }
h2 { font-size: 1.4rem; margin-top: 2.2rem; }
h3 { font-size: 1.15rem; }

.permalink {
  margin-left: 0.4rem;
  text-decoration: none;
  color: var(--muted);
  opacity: 0;
}
h1:hover .permalink, h2:hover .permalink, h3:hover .permalink,
.permalink:focus-visible { opacity: 1; }

.eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue);
}
.lede { font-size: 1.1rem; color: var(--muted); }
.promise { color: var(--green); font-weight: 600; }
.hero {
  position: relative;
  padding: clamp(2rem, 6vw, 5.5rem) 0 clamp(2rem, 4vw, 3.5rem);
}
.hero h1 { margin: 0.15em 0; font-size: clamp(3.3rem, 2rem + 6vw, 8rem); }
.hero .lede { font-size: clamp(1.1rem, 0.8rem + 1vw, 1.55rem); }
.hero .promise { position: absolute; right: 0; bottom: 3.6rem; }

/* The workspace goes side by side only when the output can still hold a
 * readable measure. Below that it stacks: a squeezed column of Markdown is
 * worse than one under the other. */
.workspace { display: grid; gap: 1.5rem; }
@media (min-width: 80rem) {
  .workspace { grid-template-columns: 2fr 3fr; align-items: start; }
}

.pane {
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: clamp(1rem, 2vw, 1.5rem);
  background: var(--panel);
}
.pane-output { background: #17191d; color: #e8eaee; }
.pane-output .pane-title { color: #bdc5d1; }
.pane-output .pane-actions button {
  border-color: #3a404b;
  background: #22252b;
  color: #dce6ff;
}
.pane-title {
  margin: 0 0 0.75rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.pane-actions { display: flex; gap: 0.5rem; margin-bottom: 0.75rem; flex-wrap: wrap; }
.pane-actions button {
  min-height: 44px;
  padding: 0 1rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
}
.pane-actions button[disabled] { opacity: 0.5; cursor: not-allowed; }

.drop {
  display: grid;
  place-items: center;
  gap: 0.35rem;
  min-height: 11rem;
  padding: 1.5rem;
  border: 2px dashed var(--blue);
  border-radius: 8px;
  background: var(--paper);
  cursor: pointer;
  text-align: center;
}
.drop.is-over { background: var(--blue-light); }
.drop-headline { font-size: 1.15rem; font-weight: 700; }
.drop-detail { color: var(--muted); font-size: 0.9rem; }
.text-action {
  margin-top: 0.75rem;
  border: 0;
  padding: 0;
  background: transparent;
  color: var(--blue);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.file-meta { color: var(--green); font-weight: 650; }
.advanced { margin-top: 0.8rem; }
.advanced summary { cursor: pointer; font-weight: 700; }
.advanced label { display: block; margin-top: 0.65rem; }
.advanced select { width: 100%; min-height: 44px; margin-top: 0.25rem; }
.drop input[type="file"] {
  /* Kept in the layout and operable by keyboard rather than hidden with
   * display:none, which would remove it from the tab order entirely. */
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}
.pane-note { color: var(--muted); font-size: 0.85rem; }
.status { font-weight: 600; }
.status[data-state="failed"] { color: var(--red); }
.status[data-state="complete"] { color: var(--green); }

.output {
  min-height: 24rem;
  max-height: 70vh;
  overflow: auto;
  margin: 0;
  padding: 1rem;
  border-radius: 8px;
  background: #17191d;
  color: #e8eaee;
  font: 13px/1.55 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  white-space: pre-wrap;
  word-break: break-word;
}
.output-nowrap { white-space: pre; word-break: normal; }

.reports { margin-top: 2rem; }
.report {
  border-left: 4px solid var(--amber);
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  background: var(--panel);
  border-radius: 0 8px 8px 0;
}
.report-kind { font-weight: 700; text-transform: uppercase; font-size: 0.75rem; }
.report[data-severity="error"] { border-left-color: var(--red); }
.report[data-severity="note"] { border-left-color: var(--blue); }

.help-links, .entries { list-style: none; padding: 0; }
.help-links li, .entries li { margin: 0.5rem 0; }
.entry h2 { margin: 0 0 0.25rem; font-size: 1.1rem; }
.entry-meta { color: var(--muted); font-size: 0.85rem; }

.notice {
  border: 1px solid var(--amber);
  border-radius: 8px;
  padding: 1rem;
  background: var(--blue-light);
}
.server-summary, .benchmark-summary {
  margin-top: clamp(3rem, 7vw, 7rem);
  padding-top: clamp(2rem, 4vw, 4rem);
  border-top: 1px solid var(--rule);
}
.command {
  overflow-x: auto;
  margin: 1.5rem 0;
  padding: 1rem;
  border-radius: 8px;
  background: #17191d;
  color: #e8eaee;
}
.reference-baseline { margin-top: 2rem; }
.reference-baseline table { display: block; overflow-x: auto; }
.benchmark-lens {
  margin: 2rem 0;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}
.benchmark-lens h3 { margin-bottom: 0.35rem; }
.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.metric {
  display: grid;
  gap: 0.25rem;
  min-height: 9rem;
  align-content: center;
  padding: 1.25rem;
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--panel);
}
.metric span {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}
.metric strong { font-size: clamp(1.8rem, 1rem + 2vw, 3rem); line-height: 1; }
.metric small { color: var(--muted); }

/* Documentation shell: recognition on the left, reading in the centre,
 * optional depth on the right. The article keeps a book-like measure even on
 * a wide monitor. */
.docs-layout {
  display: grid;
  grid-template-columns: 13rem minmax(0, 52rem) 13rem;
  justify-content: center;
  align-items: start;
  gap: clamp(1.5rem, 3vw, 3rem);
}
.docs-nav, .page-toc {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  padding: 1rem;
  border-left: 1px solid var(--rule);
  font-size: 0.88rem;
}
.docs-nav p, .page-toc p { margin: 0 0 0.65rem; }
.docs-kicker {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.page-toc ol { list-style: none; margin: 0; padding: 0; }
.page-toc li { margin: 0.5rem 0; line-height: 1.35; }
.page-toc .toc-level-3 { padding-left: 0.75rem; font-size: 0.82rem; }
.docs-content { min-width: 0; }
.docs-content > :first-child { margin-top: 0; }

.targets {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}
.target {
  padding: 1.25rem;
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--panel);
}
.target-featured { grid-column: 1 / -1; background: var(--blue-light); }
.target h2 { margin-top: 0; }
.download-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.download-button {
  display: inline-block;
  padding: 0.65rem 0.9rem;
  border-radius: 8px;
  background: var(--blue);
  color: #fff;
  font-weight: 750;
  text-decoration: none;
}
.target-meta { color: var(--muted); font-size: 0.88rem; }

@media (max-width: 72rem) {
  .docs-layout { display: block; }
  .docs-nav, .page-toc { position: static; max-height: none; margin-bottom: 2rem; }
  .page-toc { margin-top: 2rem; }
  .site-tools { order: 3; width: 100%; margin-left: 0; }
  .site-search { flex: 1; width: auto; }
}

@media (max-width: 48rem) {
  .site-header nav { order: 2; width: 100%; }
  .site-header nav ul { flex-wrap: wrap; gap: 0.4rem 1rem; }
  .hero .promise { position: static; }
  .targets { grid-template-columns: 1fr; }
  .target-featured { grid-column: auto; }
  .workspace { gap: 1rem; }
  .metric-grid { grid-template-columns: 1fr; }
  .site-tools { flex-wrap: wrap; }
  .site-search { flex-basis: 100%; }
}

/* Book and record content */
figure { margin: 1.5rem 0; }
figure img { max-width: 100%; height: auto; }
figcaption { color: var(--muted); font-size: 0.9rem; }
.figure-longdesc, .figure-data { margin-top: 0.5rem; font-size: 0.9rem; }

.callout, .teach-back, .exercise, .part-banner {
  border-left: 4px solid var(--blue);
  background: var(--panel);
  padding: 0.75rem 1rem;
  margin: 1.25rem 0;
  border-radius: 0 8px 8px 0;
}
.callout-warning { border-left-color: var(--red); }
.callout-idea { border-left-color: var(--green); }
.exercise { border-left-color: var(--amber); }
.callout-kind, .exercise-head, .teach-back-head, .part-number {
  font-weight: 700;
  margin-right: 0.35rem;
}

table { border-collapse: collapse; width: 100%; margin: 1.25rem 0; }
th, td { border: 1px solid var(--rule); padding: 0.45rem 0.6rem; text-align: left; }
th { background: var(--panel); }

pre, code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; }
pre {
  overflow-x: auto;
  padding: 0.9rem;
  border-radius: 8px;
  background: var(--code-bg);
  border: 1px solid var(--rule);
}

/* Syntax highlighting, lifted out of Typst's inline styles. */
.tok-string { color: #b3261e; }
.tok-keyword { color: #2b4ea8; }
.tok-function { color: #15691a; }
.tok-comment { color: #6b7280; font-style: italic; }
.tok-number { color: #9b1c5a; }
.tok-type { color: #125c63; }
.tok-macro { color: #6d31a0; }
.pre-wrap { white-space: pre-wrap; }
.inline-block { display: inline-block; }
.list-plain { list-style-type: none; }
.underline { text-decoration: underline; }

:root.theme-dark .tok-string { color: #ffa198; }
:root.theme-dark .tok-keyword { color: #a9c4ff; }
:root.theme-dark .tok-function { color: #87d7ac; }
:root.theme-dark .tok-comment { color: #9aa4b2; }
:root.theme-dark .tok-number { color: #f7a8c9; }
:root.theme-dark .tok-type { color: #7fd3da; }
:root.theme-dark .tok-macro { color: #c8a2f0; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

@media print {
  .site-header, .site-footer, .skip-link, .pane-actions { display: none; }
  body { background: #fff; color: #000; }
}