/* Public Information Pages — Techne / RegenHub, LCA
   Warm parchment aesthetic. Cormorant display, Source Serif 4 body, IBM Plex Mono.
   Sprint P371 (R3-E) — 2026-04-06 */

@import url('https://fonts.googleapis.com/css2?family=Cormorant:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400;1,500&family=Source+Serif+4:ital,opsz,wght@0,8..60,300;0,8..60,400;0,8..60,500;1,8..60,300;1,8..60,400&family=IBM+Plex+Mono:wght@300;400&display=swap');

:root {
  /* Extend tokens with section-local overrides */
  --font-display: 'Cormorant', 'Georgia', serif;
  --font-body:    'Source Serif 4', 'Georgia', serif;
  --font-mono:    'IBM Plex Mono', 'Courier New', monospace;

  /* Color aliases for readability (mapped to token palette) */
  --bg:           var(--parchment, #f7f5f0);
  --bg-alt:       var(--cream, #ebe7df);
  --bg-card:      rgba(235, 231, 223, 0.6);
  --text-primary: var(--charcoal, #1a1a1f);
  --text-body:    #3a3530;
  --text-dim:     var(--stone, #9a958a);
  --text-faint:   #6a6560;
  --accent:       var(--ember, #c2512a);
  --accent-dim:   rgba(194, 81, 42, 0.4);
  --accent-glow:  rgba(194, 81, 42, 0.08);
  --rule:         var(--bone, #d8d3c8);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
  font-size: 18px;
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* Skip link */
.skip-link {
  position: absolute; top: -100%; left: 0;
  background: var(--accent); color: var(--bg);
  padding: 0.5rem 1rem; z-index: 300;
  font-family: var(--font-mono); font-size: 0.75rem;
  text-decoration: none;
}
.skip-link:focus { top: 0; }

/* ─── Layout ─── */

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 2rem;
}

.container--wide {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ─── Hero ─── */

.page-hero {
  padding: 4rem 2rem 3rem;
  text-align: center;
  border-bottom: 1px solid var(--rule);
  background: linear-gradient(to bottom, var(--bg), var(--bg-alt));
}

.page-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
}

.page-hero .deck {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--text-dim);
  max-width: 34em;
  margin: 0 auto 1.5rem;
  line-height: 1.6;
}

.page-hero .meta {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--text-faint);
}

.page-hero .meta span + span::before {
  content: ' · ';
}

/* ─── Breadcrumb ─── */

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-faint);
  padding: 1.25rem 0 0;
  letter-spacing: 0.04em;
}

.breadcrumb a {
  color: var(--text-faint);
  text-decoration: none;
}

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

/* ─── Body content ─── */

.content {
  padding: 3rem 0 5rem;
}

.content section {
  margin-bottom: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--rule);
}

.content section:last-child {
  border-bottom: none;
}

h2 {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 1rem;
  line-height: 1.25;
}

h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-primary);
  margin: 2rem 0 0.75rem;
}

h4 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin: 1.5rem 0 0.5rem;
}

p {
  margin-bottom: 1rem;
  color: var(--text-body);
}

p.lead {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

em {
  font-style: italic;
  color: var(--text-primary);
}

strong {
  font-weight: 600;
  color: var(--text-primary);
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-dim);
  transition: border-color 150ms, color 150ms;
}

a:hover {
  color: #a03d1f;
  border-bottom-color: var(--accent);
}

blockquote {
  border-left: 3px solid var(--accent-dim);
  padding: 0.75rem 1.5rem;
  margin: 1.5rem 0;
  background: var(--bg-card);
  border-radius: 0 6px 6px 0;
  font-style: italic;
  color: var(--text-body);
}

blockquote p:last-child {
  margin-bottom: 0;
}

/* ─── Cards ─── */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1.5rem;
}

.card .card-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 0.5rem;
}

.card h3 {
  font-size: 1.1rem;
  margin: 0 0 0.5rem;
}

.card p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* ─── Definition list ─── */

.def-list {
  margin: 1rem 0 1.5rem;
}

.def-item {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 0.5rem 1.5rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(216, 211, 200, 0.6);
  align-items: baseline;
}

.def-item:last-child {
  border-bottom: none;
}

.def-term {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding-top: 0.1rem;
}

.def-body {
  font-size: 0.95rem;
  color: var(--text-body);
}

/* ─── Comparison table ─── */

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 1.25rem 0 2rem;
}

.comparison-table thead th {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  text-align: left;
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--rule);
}

.comparison-table tbody td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid rgba(216, 211, 200, 0.5);
  vertical-align: top;
}

.comparison-table tbody td:first-child {
  font-weight: 500;
  color: var(--text-primary);
}

.comparison-table tbody tr:nth-child(even) {
  background: rgba(235, 231, 223, 0.4);
}

.comparison-table .highlight-row td {
  background: var(--accent-glow);
  font-weight: 500;
}

/* ─── FAQ ─── */

.faq {
  margin: 1.5rem 0;
}

.faq-item {
  border-top: 1px solid var(--rule);
  padding: 1.25rem 0;
}

.faq-item:last-child {
  border-bottom: 1px solid var(--rule);
}

.faq-q {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.faq-a {
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.65;
}

/* ─── Inline source reference ─── */

.source-ref {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
  letter-spacing: 0.05em;
  vertical-align: middle;
  margin-left: 0.25rem;
}

/* ─── Section nav / related pages ─── */

.section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 2rem 0;
}

.section-nav a {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0.3rem 0.75rem;
  text-decoration: none;
  transition: color 150ms, border-color 150ms;
}

.section-nav a:hover {
  color: var(--accent);
  border-color: var(--accent-dim);
}

.section-nav a.active {
  color: var(--accent);
  border-color: var(--accent-dim);
  background: var(--accent-glow);
}

/* ─── Reading list / link list ─── */

.link-list {
  list-style: none;
  margin: 1rem 0;
}

.link-list li {
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(216, 211, 200, 0.5);
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.link-list li:last-child {
  border-bottom: none;
}

.link-list .link-title {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--accent);
  text-decoration: none;
  border-bottom: none;
}

.link-list .link-title:hover {
  color: #a03d1f;
}

.link-list .link-note {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-faint);
  letter-spacing: 0.04em;
}

/* ─── Footer ─── */

.page-footer {
  border-top: 1px solid var(--rule);
  padding: 2rem 0;
  margin-top: 2rem;
}

.page-footer p {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  margin-bottom: 0.25rem;
}

/* ─── Mobile ─── */

@media (max-width: 640px) {
  .container, .container--wide {
    padding: 0 1.25rem;
  }

  .def-item {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .comparison-table {
    font-size: 0.82rem;
  }
}