:root {
  color-scheme: light dark;
  --background: #f8fafc;
  --text: #102033;
  --muted: #526173;
  --link: #2563eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #0f172a;
    --text: #f8fafc;
    --muted: #cbd5e1;
    --link: #93c5fd;
  }
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font: 16px/1.5 system-ui, sans-serif;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 24px;
}

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

.record-list {
  display: grid;
  gap: 16px;
  padding: 0;
  list-style: none;
}

.record-list a {
  display: block;
  padding: 16px;
  border: 1px solid color-mix(in srgb, var(--muted) 35%, transparent);
  border-radius: 8px;
  text-decoration: none;
}

.record-list strong {
  display: block;
}

.record-list span {
  color: var(--muted);
}

* { box-sizing: border-box; }
body { overflow-wrap: anywhere; }
header { max-width: 960px; margin: auto; padding: 1rem 24px; }
nav { display: flex; flex-wrap: wrap; gap: .6rem 1.2rem; }
.skip-link { position: absolute; top: -5rem; left: 1rem; background: var(--background); padding: .5rem; }
.skip-link:focus { top: .5rem; }
.table-scroll { max-width: 100%; overflow-x: auto; }
.table-scroll:focus-visible { outline: 3px solid var(--link); outline-offset: 2px; }
table { border-collapse: collapse; width: 100%; min-width: 42rem; }
caption { text-align: left; font-weight: bold; margin: .5rem 0; }
th, td { text-align: left; vertical-align: top; padding: .6rem; border-bottom: 1px solid var(--muted); }
th { min-width: 8rem; }
blockquote { margin: .4rem 0 1rem; }
#pathway-search { margin: 1rem 0; }
#pathway-search label { display: block; }
#pathway-search input, #pathway-search button { max-width: 100%; padding: .5rem; font: inherit; background: var(--background); color: var(--text); border: 1px solid var(--muted); }

/* The landing page follows the Mech hero, statistics, and navigation-card pattern. */
.home-page {
  --home-card: #ffffff;
  --home-border: #dce4ef;
  --home-hero-start: #e0eaff;
  --home-hero-end: #eae4fa;
  --home-stat: #ffffffb8;
  --home-accent: #1d4ed8;
  --home-on-accent: #ffffff;
}
.home-page header { max-width: 1120px; padding: 1.4rem 24px; }
.home-page nav a { font-weight: 600; text-decoration: none; }
.home-page a:hover { text-decoration: underline; }
.home-page a:focus-visible { outline: 3px solid var(--link); outline-offset: 5px; }
.home-page .skip-link { z-index: 1; }
.home-page main { max-width: none; padding: 0; }
.home-hero {
  padding: 4rem 24px 3rem;
  text-align: center;
  background: linear-gradient(135deg, var(--home-hero-start), var(--home-hero-end));
  border-block: 1px solid var(--home-border);
}
.home-eyebrow { margin: 0 0 .8rem; color: var(--muted); font-weight: 600; }
.home-hero h1 { margin: 0; font-size: clamp(2.4rem, 6vw, 3.2rem); line-height: 1.15; letter-spacing: -.03em; }
.home-tagline { max-width: 680px; margin: 1.2rem auto 1.8rem; font-size: 1.2rem; color: var(--muted); }
.home-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: .8rem; }
.home-button {
  display: inline-block;
  padding: .75rem 1.4rem;
  border: 1px solid var(--home-accent);
  border-radius: 999px;
  background: var(--home-accent);
  color: var(--home-on-accent);
  font-weight: 600;
  text-decoration: none;
}
.home-button-secondary { background: var(--home-card); color: var(--home-accent); }
.home-stats { display: flex; justify-content: center; flex-wrap: wrap; gap: 1rem; margin: 2.5rem auto 0; max-width: 960px; }
.home-stat {
  display: flex;
  flex-direction: column;
  flex: 1 1 180px;
  max-width: 220px;
  padding: 1rem;
  border-radius: 12px;
  background: var(--home-stat);
  border: 1px solid var(--home-border);
}
.home-stat dt { order: 1; color: var(--muted); font-size: .9rem; }
.home-stat dd { margin: 0; font-size: 2rem; line-height: 1.3; font-weight: 700; }
.home-explore { max-width: 1120px; margin: auto; padding: 3rem 24px; }
.home-explore h2 { margin: 0; font-size: 1.75rem; }
.home-section-intro { margin: .6rem 0 1.6rem; color: var(--muted); }
.home-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.5rem; }
.home-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 28px;
  background: var(--home-card);
  border: 1px solid var(--home-border);
  border-radius: 16px;
  box-shadow: 0 4px 16px #10203308;
}
.home-card h3 { margin: 0; font-size: 1.25rem; }
.home-card p { color: var(--muted); margin: 1rem 0 1.5rem; }
.home-card a { margin-top: auto; font-weight: 600; }
.home-footer { padding: 1.5rem 24px 2.5rem; text-align: center; color: var(--muted); }
.home-footer a { display: inline-block; margin: .5rem; }
@media (max-width: 800px) {
  .home-cards { grid-template-columns: 1fr; }
  .home-hero { padding: 2.5rem 24px; }
  .home-stat { flex-basis: 130px; }
}
@media (prefers-color-scheme: dark) {
  .home-page {
    --home-card: #18243a;
    --home-border: #40506b;
    --home-hero-start: #1a2c48;
    --home-hero-end: #302542;
    --home-stat: #172338d9;
    --home-accent: #93c5fd;
    --home-on-accent: #102033;
  }
}

/* Long identifiers, exact source extracts and graph fingerprints stay local. */
main { overflow-wrap: anywhere; }
pre { max-width: 100%; overflow: auto; white-space: pre-wrap; }
dt { font-weight: 650; }
dd { margin: 0 0 1rem; }
details { margin-block: .5rem; }