/* ============================================================================
   bio.viz site — the safety.viz portfolio theme, trimmed to the pages that
   exist here. Same tokens (espresso #271810 · paper #faf6f1 · orange #f97316;
   Instrument Serif headings, Instrument Sans body, IBM Plex Mono meta), so the
   two sites read as one family.

     1. Design tokens
     2. Base elements
     3. Site chrome: full-bleed header and footer bands
     4. Page components: hero, callout, facts, module list
     5. R check page: answers, comparisons, measurement tables
     6. Module pages: tabs, evidence lists, the API reference
     7. A chart's demo page

   Every rule has to hold at a 390px-wide viewport with no horizontal scroll;
   tests/e2e/site.spec.js measures it.
   ============================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Sans:ital,wght@0,400..700;1,400..700&family=Instrument+Serif:ital@0;1&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

/* ---- 1. Design tokens ---------------------------------------------------- */

:root {
  /* Surfaces */
  --side-bg: #271810; /* espresso bands */
  --side-ink: #f5ede4;
  --side-soft: #c4a995;
  --paper: #faf6f1;
  --panel: #f5efe7; /* warm inset: code, facts */
  --card: #ffffff;

  /* Ink */
  --ink: #2a211b;
  --muted: #6b5d52;

  /* Accent */
  --accent: #c2410c; /* links */
  --accent-bright: #f97316; /* borders, hover, highlights */

  /* Rules */
  --rule: #ece2d7;

  /* Type */
  --sans: 'Instrument Sans', system-ui, -apple-system, sans-serif;
  --serif: 'Instrument Serif', Georgia, serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* Layout */
  --measure: 52rem; /* main column */
  --band-pad: max(calc(50vw - (var(--measure) / 2)), 1.25rem);
  --radius: 14px;
  --radius-small: 8px;
}

/* ---- 2. Base elements ---------------------------------------------------- */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  /* Long unbroken strings (paths, identifiers) wrap instead of widening the page. */
  overflow-wrap: anywhere;
}

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 400;
  line-height: 1.15;
  margin: 0 0 0.5rem;
}

h1 {
  font-size: clamp(2.5rem, 9vw, 4rem);
}

h2 {
  font-size: 1.75rem;
}

h3 {
  font-size: 1.3rem;
}

p {
  margin: 0 0 1rem;
}

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

a:hover {
  color: var(--accent-bright);
}

code,
pre {
  font-family: var(--mono);
  font-size: 0.875em;
}

code {
  background: var(--panel);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

pre {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius-small);
  margin: 0 0 1rem;
  padding: 0.9rem 1rem;
  /* Wrap rather than scroll: a phone reader sees the whole snippet. */
  white-space: pre-wrap;
}

pre code {
  background: none;
  padding: 0;
  font-size: 1em;
}

/* ---- 3. Site chrome ------------------------------------------------------ */

.site-header,
.site-footer {
  background: var(--side-bg);
  color: var(--side-ink);
  padding: 1rem var(--band-pad);
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  border-bottom: 3px solid var(--accent-bright);
}

.site-name {
  color: var(--side-ink);
  font-family: var(--serif);
  font-size: 1.6rem;
  text-decoration: none;
}

.site-version {
  color: var(--side-soft);
  font-family: var(--mono);
  font-size: 0.8rem;
  margin-left: 0.35rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  font-size: 0.95rem;
}

.site-nav a,
.site-footer a {
  color: var(--side-ink);
}

.site-nav a:hover,
.site-footer a:hover {
  color: var(--accent-bright);
}

.site-main {
  margin: 0 auto;
  max-width: calc(var(--measure) + 2.5rem);
  padding: 2.5rem 1.25rem 3rem;
}

.site-main > section,
.site-main > aside,
.site-main > nav,
.site-main > article {
  margin-bottom: 2.5rem;
}

.site-footer {
  color: var(--side-soft);
  font-size: 0.9rem;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}

.site-footer p:last-child {
  margin-bottom: 0;
}

.site-footer code {
  background: none;
  color: var(--side-ink);
  padding: 0;
}

/* ---- 4. Page components -------------------------------------------------- */

.eyebrow {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
}

.hero-version {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.4em;
  white-space: nowrap;
}

.lead {
  font-size: 1.15rem;
  max-width: 40rem;
}

.callout {
  background: var(--card);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--accent-bright);
  border-radius: var(--radius-small);
  padding: 1.1rem 1.25rem;
}

.callout p:last-child {
  margin-bottom: 0;
}

.facts {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  margin: 0;
  padding: 0.25rem 1.25rem;
}

.facts > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.15rem 1.5rem;
  padding: 0.7rem 0;
}

.facts > div + div {
  border-top: 1px solid var(--rule);
}

.facts dt {
  color: var(--muted);
}

.facts dd {
  font-weight: 600;
  margin: 0;
}

.modules {
  display: grid;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.module {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}

.module p {
  margin-bottom: 0.5rem;
}

.module-facts {
  color: var(--muted);
  font-size: 0.9rem;
}

.module p:last-child {
  margin-bottom: 0;
}

/* ---- 5. R check page ----------------------------------------------------- */

.sub {
  color: var(--muted);
  font-size: 0.9rem;
}

th .sub {
  display: block;
  font-weight: 400;
}

.notes {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0;
  padding-left: 1.1rem;
}

.notes li + li {
  margin-top: 0.35rem;
}

.modules + .notes {
  margin-top: 1rem;
}

/* The R check page's one button. Named, so the rule stays off the buttons a
   chart draws inside a demo page. */
#start-r {
  background: var(--side-bg);
  border: 0;
  border-radius: var(--radius-small);
  color: var(--side-ink);
  cursor: pointer;
  font: 600 1rem var(--sans);
  padding: 0.7rem 1.1rem;
}

#start-r:hover:not(:disabled) {
  background: var(--accent);
}

#start-r:disabled {
  cursor: default;
  opacity: 0.55;
}

#r-status {
  font-weight: 600;
}

.answers {
  display: grid;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.answer,
.comparison-block {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}

.comparison-block {
  margin-bottom: 1rem;
}

.answer-data {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.answer-text {
  background: var(--panel);
  border-left: 4px solid var(--accent-bright);
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.875rem;
  padding: 0.6rem 0.8rem;
}

.answer .answer-text {
  margin-bottom: 0;
}

.verdict {
  font-weight: 600;
}

.verdict.differs,
.comparison .differs h4 {
  color: #b91c1c;
}

.comparison {
  display: grid;
  gap: 0.6rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.comparison li {
  border-top: 1px solid var(--rule);
  padding-top: 0.6rem;
}

.comparison h4 {
  font: 600 0.875rem var(--mono);
  margin: 0 0 0.3rem;
}

.comparison dl {
  display: grid;
  gap: 0.15rem 1rem;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  margin: 0;
}

.comparison dt {
  color: var(--muted);
  font-size: 0.8rem;
}

.comparison dd {
  font-family: var(--mono);
  font-size: 0.8rem;
  margin: 0;
}

.recorded {
  background: var(--card);
  border: 1px solid var(--rule);
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  width: 100%;
}

.recorded th,
.recorded td {
  border-bottom: 1px solid var(--rule);
  padding: 0.5rem 0.6rem;
  text-align: left;
  vertical-align: top;
}

.recorded thead th {
  background: var(--panel);
  color: var(--muted);
  font-size: 0.75rem;
  /* Column headings wrap between words, never inside one. */
  overflow-wrap: normal;
}

.recorded td {
  font-family: var(--mono);
  white-space: nowrap;
}

.comparison-block details {
  border-top: 1px solid var(--rule);
  margin-top: 0.6rem;
  padding-top: 0.6rem;
}

.comparison-block summary {
  color: var(--accent);
  cursor: pointer;
  font-size: 0.9rem;
}

.comparison-block details .comparison {
  margin-top: 0.6rem;
}

/* ---- 6. Module pages ------------------------------------------------------ */

.module-links {
  font-weight: 600;
}

.page-tabs {
  border-bottom: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  margin-top: 1.25rem;
  padding-bottom: 0.6rem;
}

.page-tabs a {
  text-decoration: none;
}

.page-tabs a.current {
  border-bottom: 3px solid var(--accent-bright);
  color: var(--ink);
  font-weight: 600;
  margin-bottom: calc(-0.6rem - 2px);
  padding-bottom: 0.6rem;
}

.chip {
  border-radius: 999px;
  display: inline-block;
  font: 600 0.72rem var(--mono);
  letter-spacing: 0.02em;
  padding: 0.1rem 0.55rem;
  vertical-align: 0.1em;
  white-space: nowrap;
}

.chip.status-pass {
  background: #dcfce7;
  color: #166534;
}

.chip.status-fail {
  background: #fee2e2;
  color: #991b1b;
}

.chip.status-none {
  background: var(--panel);
  color: var(--muted);
}

.chip-link {
  text-decoration: none;
}

.requirements {
  display: grid;
  gap: 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.requirement {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}

.requirement[data-status='fail'] {
  border-left: 4px solid #b91c1c;
}

.requirement h3 {
  font: 600 0.95rem var(--mono);
  margin-bottom: 0.5rem;
}

.req-text {
  margin-bottom: 0.75rem;
}

.tests {
  color: var(--muted);
  display: grid;
  font-size: 0.9rem;
  gap: 0.45rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.suite {
  font: 0.72rem var(--mono);
  text-transform: uppercase;
}

.screenshots {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.9rem;
}

.screenshot {
  border: 1px solid var(--rule);
  border-radius: var(--radius-small);
  display: block;
  height: auto;
  max-width: 100%;
}

#shared-tests summary {
  color: var(--accent);
  cursor: pointer;
  margin-bottom: 0.75rem;
}

.api-toc {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}

.api-toc h2 {
  font-size: 1.3rem;
}

.api-toc ul {
  margin: 0;
  padding-left: 1.1rem;
}

.api-toc li + li {
  margin-top: 0.25rem;
}

.api-body h2 {
  border-top: 1px solid var(--rule);
  margin-top: 2.5rem;
  padding-top: 1.5rem;
}

.api-body h3 {
  margin-top: 1.5rem;
}

.api-body ul,
.api-body ol {
  margin: 0 0 1rem;
  padding-left: 1.3rem;
}

.api-body li + li {
  margin-top: 0.35rem;
}

.doc-table {
  background: var(--card);
  border: 1px solid var(--rule);
  border-collapse: collapse;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  width: 100%;
}

.doc-table th,
.doc-table td {
  border-bottom: 1px solid var(--rule);
  padding: 0.5rem 0.6rem;
  text-align: left;
  vertical-align: top;
}

.doc-table thead th {
  background: var(--panel);
  color: var(--muted);
  font-size: 0.75rem;
  overflow-wrap: normal;
}

/* On a narrow screen a table becomes a list of rows, each cell under the name
   of its column, so no table ever needs a sideways scroll. */
@media (max-width: 44rem) {
  .doc-table,
  .doc-table tbody,
  .doc-table tr,
  .doc-table td {
    display: block;
  }

  .doc-table thead {
    display: none;
  }

  .doc-table tr {
    border-bottom: 1px solid var(--rule);
    padding: 0.5rem 0.75rem;
  }

  .doc-table tr:last-child {
    border-bottom: 0;
  }

  .doc-table td {
    border: 0;
    padding: 0.2rem 0;
  }

  .doc-table td::before {
    color: var(--muted);
    content: attr(data-label);
    display: block;
    font-size: 0.72rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
  }
}

/* ---- 7. A chart's demo page ---------------------------------------------- */

/* A chart with its sidebar needs more room than a page of prose. */
.site-main.wide {
  max-width: 82rem;
}

.site-main.wide > .hero .lead {
  max-width: 52rem;
}

#chart {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1rem;
}

.module-hero {
  display: block;
  margin-bottom: 0.9rem;
}

.module-hero img {
  border: 1px solid var(--rule);
  border-radius: var(--radius-small);
  display: block;
  height: auto;
  max-width: 100%;
}

#about-demo .sub {
  margin-top: 1rem;
}

@media (max-width: 44rem) {
  #chart {
    padding: 0.5rem;
  }
}