:root {
  --bg: #f3f6fa;
  --bg-strong: #e2e8f0;
  --panel: rgba(255, 255, 255, 0.94);
  --panel-strong: rgba(255, 255, 255, 0.98);
  --text: #14202d;
  --muted: #5b6776;
  --line: rgba(20, 32, 45, 0.12);
  --accent: #163f6b;
  --accent-soft: #e8eef6;
  --accent-ink: #0f2d4c;
  --solid: #25624b;
  --research: #7b4f22;
  --caution: #9a6b1f;
  --shadow: 0 8px 18px rgba(24, 33, 43, 0.06);
  --radius: 14px;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

body {
  margin: 0;
  font-family: "Manrope", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(22, 63, 107, 0.06), transparent 20%),
    linear-gradient(180deg, #fbfcfe 0%, var(--bg) 100%);
}

a { color: inherit; }

.read-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 4px;
  z-index: 40;
  background: rgba(30, 42, 40, 0.08);
}

.read-progress span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), #5c7ea4);
}

.page-shell {
  width: min(calc(100% - 2rem), var(--max));
  margin: 0 auto;
  padding-bottom: 3rem;
}

.site-header {
  position: sticky;
  top: 4px;
  z-index: 20;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.68rem 0 0.55rem;
  backdrop-filter: blur(10px);
  background: rgba(251, 252, 254, 0.94);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 6px 16px rgba(24, 33, 43, 0.04);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.85rem;
}

.brand {
  font-family: "Fraunces", serif;
  font-size: 1.32rem;
  font-weight: 700;
  letter-spacing: 0.005em;
  text-decoration: none;
  color: var(--accent-ink);
  line-height: 1.15;
}

.top-nav, .index-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 0.8rem;
}

.top-nav {
  flex-shrink: 0;
  white-space: nowrap;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  justify-content: space-between;
  min-width: 0;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
}

.top-nav a, .index-strip a {
  text-decoration: none;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.top-nav a:hover,
.top-nav a:focus-visible {
  color: var(--accent);
}

.index-strip {
  position: sticky;
  top: 72px;
  z-index: 18;
  padding: 0.58rem 0 0.78rem;
  overflow-x: auto;
  white-space: nowrap;
  background: linear-gradient(180deg, rgba(251, 252, 254, 0.98), rgba(247, 249, 252, 0.92));
  border-bottom: 1px solid var(--line);
}

.index-strip a {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.38rem 0.62rem;
  background: rgba(255, 255, 255, 0.84);
}

.index-strip a:hover,
.index-strip a:focus-visible {
  background: var(--accent-soft);
  border-color: rgba(31, 79, 130, 0.24);
  color: var(--accent);
}

.hero, .section, .disclaimer, .index-strip {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 500ms ease, transform 500ms ease;
}

.hero.is-visible, .section.is-visible, .disclaimer.is-visible, .index-strip.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 1rem;
  align-items: start;
  padding: 1.15rem 0 0.55rem;
}

.eyebrow {
  margin: 0 0 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.58rem;
  color: var(--accent);
  font-weight: 800;
}

h1, h2, h3, h4 {
  font-family: "Fraunces", serif;
  margin-top: 0;
  color: var(--accent-ink);
}

h1 {
  font-size: clamp(1rem, 1.35vw, 1.32rem);
  line-height: 1.24;
  margin-bottom: 0.42rem;
  max-width: 30ch;
  font-weight: 600;
  letter-spacing: 0;
}

.lede,
.section p,
.summary-card p,
.type-card p,
.application-card p,
.expert-card p,
.timeline-card p,
.risk-item p {
  line-height: 1.62;
}

.lede {
  font-size: 0.82rem;
  max-width: 65ch;
  color: var(--muted);
}

.hero-overview {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
  margin: 0.75rem 0 0.45rem;
}

.overview-item {
  padding: 0.68rem 0.72rem;
  border: 1px solid rgba(22, 63, 107, 0.1);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(239, 244, 250, 0.86));
  box-shadow: 0 6px 14px rgba(20, 32, 45, 0.04);
}

.overview-item strong {
  display: block;
  color: var(--accent-ink);
  font-size: 0.73rem;
  line-height: 1.35;
}

.overview-label {
  display: inline-block;
  margin-bottom: 0.24rem;
  color: var(--accent);
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.8rem 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.05rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  transition: background-color 200ms ease, color 200ms ease, border-color 200ms ease, transform 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--accent);
  color: #f7f6f1;
  box-shadow: 0 8px 18px rgba(22, 63, 107, 0.14);
}

.button-secondary {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.98);
}

.signal-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.signal-pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.3rem 0.46rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(238, 243, 249, 0.9));
  color: var(--muted);
  font-size: 0.66rem;
}

.hero-panel {
  display: grid;
  gap: 0.7rem;
  align-content: start;
  min-height: 100%;
  padding: 0.9rem;
  border: 1px solid rgba(22, 63, 107, 0.12);
  border-radius: calc(var(--radius) + 2px);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.99), rgba(239, 244, 250, 0.94)),
    linear-gradient(135deg, rgba(22, 63, 107, 0.025), transparent);
  box-shadow: 0 10px 24px rgba(24, 33, 43, 0.06);
  position: relative;
  overflow: hidden;
}

.orbital {
  position: absolute;
  border: 1px solid rgba(22, 63, 107, 0.07);
  border-radius: 50%;
}

.orbital-a {
  width: 280px;
  height: 280px;
  top: -70px;
  right: -50px;
}

.orbital-b {
  width: 180px;
  height: 180px;
  bottom: -35px;
  left: -45px;
}

.hero-card {
  display: block;
  position: relative;
  padding: 0.78rem 0.82rem;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(22, 63, 107, 0.12);
  border-radius: 12px;
  box-shadow: 0 8px 18px rgba(24, 33, 43, 0.05);
}

.hero-card.secondary {
  margin-top: 0;
  background: linear-gradient(180deg, rgba(232, 239, 247, 0.78), rgba(255, 255, 255, 0.98));
}

.status-badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.22rem 0.45rem;
  font-size: 0.62rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.status-solid { color: var(--solid); background: rgba(45, 111, 77, 0.12); }
.status-research { color: var(--research); background: rgba(140, 79, 35, 0.12); }
.status-caution { color: var(--caution); background: rgba(157, 106, 28, 0.12); }
.status-source { color: var(--accent); background: var(--accent-soft); }

.disclaimer {
  margin: 0 0 1rem;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  border: 1px solid rgba(157, 106, 28, 0.18);
  background: rgba(255, 251, 244, 0.92);
  color: #624d2b;
}

.section { padding: 2rem 0 0; }
.section-heading { margin-bottom: 0.8rem; }

.section h2 {
  font-size: clamp(0.92rem, 1.15vw, 1.08rem);
  margin-bottom: 0;
  line-height: 1.26;
  letter-spacing: 0;
  font-weight: 600;
}

.section-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0 0 0.4rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem 0.46rem;
  border-radius: 999px;
  background: rgba(232, 238, 246, 0.95);
  border: 1px solid rgba(22, 63, 107, 0.1);
  color: var(--accent);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section-note { max-width: 75ch; color: var(--muted); }

.summary-grid,
.types-grid,
.pathway-grid,
.myths-grid,
.glossary-grid,
.timeline-grid,
.applications-grid,
.experts-grid,
.risk-list,
.ethics-grid {
  display: grid;
  gap: 1rem;
}

.rich-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.summary-card,
.type-card,
.pathway-step,
.myth-card,
.glossary-grid article,
.sources-box,
.evidence-panel,
.info-block,
.timeline-card,
.application-card,
.expert-card,
.risk-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.summary-card,
.type-card,
.pathway-step,
.myth-card,
.glossary-grid article,
.timeline-card,
.application-card,
.expert-card,
.risk-item {
  padding: 0.82rem;
}

.split-section, .dual-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

.evidence-panel, .sources-box, .info-block { padding: 1.4rem; }

.evidence-panel {
  background: linear-gradient(180deg, rgba(232, 239, 247, 0.82), rgba(255, 255, 255, 0.96));
}

.evidence-panel ul, .sources-box ul {
  margin: 1rem 0 0;
  padding-left: 1.1rem;
}

.timeline-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.timeline-year {
  display: inline-block;
  margin-bottom: 0.7rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: var(--bg-strong);
  font-size: 0.82rem;
  font-weight: 800;
}

.types-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.type-card header, .application-card header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.8rem;
  margin-bottom: 1rem;
}

dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.55rem 0.9rem;
  margin: 1.2rem 0 0;
}

dt { font-weight: 800; }
dd { margin: 0; color: var(--muted); }

.mini-stack { display: grid; gap: 1rem; }

.striped-block {
  background:
    linear-gradient(180deg, rgba(22, 63, 107, 0.05), transparent),
    repeating-linear-gradient(135deg, rgba(22, 63, 107, 0.02) 0 14px, transparent 14px 28px),
    var(--panel-strong);
}

.pathway-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.pathway-step {
  position: relative;
  padding-top: 3.8rem;
}

.step-index {
  position: absolute;
  top: 1rem;
  left: 1rem;
  width: 2rem;
  height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  font-weight: 800;
}

.applications-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.solid-card,
.solid-block {
  background: linear-gradient(180deg, rgba(229, 240, 235, 0.92), rgba(255, 255, 255, 0.98));
}

.research-block {
  background: linear-gradient(180deg, rgba(245, 238, 228, 0.9), rgba(255, 255, 255, 0.98));
}

.ethics-grid, .risk-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.myths-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.faq-list { display: grid; gap: 0.8rem; }

.faq-list details {
  border: 1px solid rgba(22, 63, 107, 0.12);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.94);
  padding: 1rem 1.1rem;
  box-shadow: var(--shadow);
}

.faq-list summary {
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

.faq-list summary::-webkit-details-marker { display: none; }

.glossary-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.experts-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.sources-box a { color: var(--accent); }
.updated-at { margin-top: 1.1rem; color: var(--muted); }

.lang-switch {
  display: inline-flex;
  gap: 0.4rem;
  align-items: center;
  white-space: nowrap;
}

.lang-switch a {
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.82);
}

.lang-switch a.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.site-search {
  position: relative;
  flex: 0 1 240px;
  min-width: 160px;
}

.search-toolbar {
  display: grid;
  gap: 0.5rem;
}

.site-search input {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 16px;
  border: 1px solid rgba(31, 79, 130, 0.14);
  background: rgba(255, 255, 255, 0.94);
  font: inherit;
  color: var(--text);
}

.search-filters {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.search-filters select {
  flex: 1;
  min-width: 150px;
  padding: 0.7rem 0.9rem;
  border-radius: 14px;
  border: 1px solid rgba(31, 79, 130, 0.14);
  background: rgba(255, 255, 255, 0.94);
  font: inherit;
  color: var(--muted);
}

.search-results {
  display: none;
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  right: 0;
  z-index: 30;
  padding: 0.6rem;
  background: rgba(255, 255, 255, 0.98);
  border: 1px solid rgba(31, 79, 130, 0.12);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.site-search.has-results .search-results {
  display: grid;
  gap: 0.45rem;
}

.search-result,
.search-empty {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem;
  border-radius: 14px;
  text-decoration: none;
}

.search-result {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(241, 246, 252, 0.9));
}

.search-result span {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.search-result p,
.search-empty {
  margin: 0;
  color: var(--muted);
}

.page-links,
.illustration-grid,
.center-grid,
.criteria-grid,
.method-grid {
  display: grid;
  gap: 1rem;
}

.page-links,
.illustration-grid,
.center-grid,
.criteria-grid,
.method-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.page-card,
.illustration-card,
.center-card,
.criteria-card,
.method-card {
  padding: 1.25rem;
  background: var(--panel);
  border: 1px solid rgba(22, 63, 107, 0.12);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-card,
.center-card,
.criteria-card,
.method-card,
.summary-card,
.type-card,
.application-card,
.expert-card,
.timeline-card,
.myth-card,
.pathway-step,
.risk-item,
.glossary-grid article {
  position: relative;
  overflow: hidden;
}

.page-card::before,
.center-card::before,
.criteria-card::before,
.method-card::before,
.summary-card::before,
.type-card::before,
.application-card::before,
.expert-card::before,
.timeline-card::before,
.myth-card::before,
.pathway-step::before,
.risk-item::before,
.glossary-grid article::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, rgba(22, 63, 107, 0.78), rgba(104, 132, 166, 0.28));
}

.page-card a,
.center-card a,
.criteria-card a {
  color: var(--accent);
}

.record-meta {
  display: grid;
  gap: 0.45rem;
  margin-top: 1rem;
  padding-top: 0.9rem;
  border-top: 1px solid rgba(30, 42, 40, 0.08);
}

.record-meta p {
  margin: 0;
  font-size: 0.94rem;
}

.timeline-record {
  display: grid;
  gap: 0.65rem;
}

.timeline-record .status-badge {
  width: fit-content;
}

.timeline-ids {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.timeline-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
  font-size: 0.82rem;
  color: var(--muted);
}

.timeline-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.2rem;
  padding: 0.8rem;
  border: 1px solid rgba(22, 63, 107, 0.1);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(242, 246, 251, 0.88));
}

.timeline-search {
  min-width: 240px;
  flex: 1;
  padding: 0.7rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  font: inherit;
  color: var(--text);
}

.timeline-filter {
  padding: 0.7rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  font: inherit;
  color: var(--muted);
  cursor: pointer;
}

.timeline-filter.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.timeline-select,
.timeline-export {
  padding: 0.7rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  font: inherit;
  color: var(--muted);
}

.timeline-table-wrap {
  margin-top: 1.25rem;
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow);
}

.timeline-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 900px;
}

.timeline-table th,
.timeline-table td {
  padding: 0.78rem 0.85rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
  font-size: 0.86rem;
}

.timeline-table th {
  font-family: "Fraunces", serif;
  font-size: 0.8rem;
  font-weight: 600;
  background: rgba(232, 237, 243, 0.9);
}

.timeline-page .hero {
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: 1.25rem;
  padding-top: 1.6rem;
}

.timeline-page .hero-panel {
  padding: 1rem;
  background:
    radial-gradient(circle at top right, rgba(22, 63, 107, 0.08), transparent 32%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.99), rgba(237, 243, 249, 0.94));
}

.timeline-page .page-shell {
  position: relative;
}

.timeline-page .page-shell::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 15% 12%, rgba(22, 63, 107, 0.08), transparent 20%),
    radial-gradient(circle at 82% 20%, rgba(37, 98, 75, 0.06), transparent 18%),
    radial-gradient(circle at 50% 70%, rgba(22, 63, 107, 0.05), transparent 24%);
  z-index: -1;
}

.timeline-page .method-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.timeline-page .timeline-intro {
  padding-top: 1rem;
}

.timeline-page .timeline-era-panel {
  padding-top: 0.8rem;
}

.timeline-page .hero {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(22, 63, 107, 0.1);
  background:
    radial-gradient(circle at top left, rgba(64, 125, 191, 0.18), transparent 32%),
    linear-gradient(135deg, rgba(10, 31, 55, 0.98), rgba(18, 52, 86, 0.96) 52%, rgba(232, 239, 246, 0.98) 52.2%, rgba(245, 248, 252, 0.99) 100%);
  box-shadow: 0 24px 56px rgba(14, 25, 38, 0.14);
}

.timeline-page .hero::after {
  content: "";
  position: absolute;
  inset: auto -6% -18% auto;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(64, 125, 191, 0.18), transparent 64%);
  pointer-events: none;
}

.timeline-page .hero-copy {
  position: relative;
  z-index: 1;
  color: #f4f8fc;
}

.timeline-page .hero-copy .eyebrow,
.timeline-page .hero-copy .lede,
.timeline-page .hero-copy .overview-label {
  color: rgba(236, 244, 250, 0.8);
}

.timeline-page .hero-copy h1 {
  color: #f9fbfd;
  max-width: 12ch;
}

.timeline-page .hero-overview {
  gap: 0.75rem;
}

.timeline-page .overview-item {
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(6px);
}

.timeline-page .overview-item strong {
  color: #f7fbff;
}

.timeline-page .hero-panel {
  position: relative;
  z-index: 1;
  align-self: stretch;
}

.timeline-page .hero-asset {
  border: 1px solid rgba(22, 63, 107, 0.12);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(238, 244, 251, 0.95));
  box-shadow: 0 18px 40px rgba(10, 24, 42, 0.14);
}

.timeline-page .section-heading h2 {
  max-width: 18ch;
}

.timeline-page .section-tags {
  gap: 0.45rem;
}

.timeline-page .section-tag {
  border-color: rgba(22, 63, 107, 0.14);
  background: rgba(239, 245, 252, 0.9);
}

.timeline-page .era-scrubber {
  --era-progress: 0%;
  padding: 1.25rem;
  border-radius: 24px;
  border: 1px solid rgba(22, 63, 107, 0.1);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.99), rgba(240, 245, 251, 0.94));
  box-shadow: 0 18px 42px rgba(20, 32, 45, 0.08);
  position: relative;
  overflow: hidden;
}

.timeline-page .era-scrubber::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 10px;
  background: linear-gradient(180deg, rgba(31, 95, 152, 0.9), rgba(72, 141, 190, 0.5));
}

.timeline-page .era-scrubber-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 0.85rem;
}

.timeline-page .era-readout {
  display: grid;
  gap: 0.12rem;
  justify-items: end;
  text-align: right;
}

.timeline-page .era-readout strong {
  color: var(--accent-ink);
  font-family: "Fraunces", serif;
  font-size: 1.1rem;
}

.timeline-page .era-readout span {
  color: var(--muted);
  font-size: 0.76rem;
}

.timeline-page [data-era-range] {
  width: 100%;
  appearance: none;
  height: 10px;
  border-radius: 999px;
  background: linear-gradient(90deg, #1f5f98 0 var(--era-progress), rgba(214, 223, 234, 0.92) var(--era-progress) 100%);
  outline: none;
}

.timeline-page [data-era-range]::-webkit-slider-thumb {
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  border: 4px solid #1f5f98;
  box-shadow: 0 0 0 7px rgba(31, 95, 152, 0.12);
  cursor: pointer;
}

.timeline-page .era-scale {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.7rem;
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 700;
}

.timeline-page .era-spotlight {
  display: grid;
  grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
  gap: 1rem;
  margin-top: 1.15rem;
}

.timeline-page .era-spotlight-card,
.timeline-page .era-rail {
  padding: 1rem 1.05rem;
  border-radius: 20px;
  border: 1px solid rgba(22, 63, 107, 0.1);
  background:
    linear-gradient(180deg, rgba(250, 252, 255, 0.98), rgba(237, 243, 250, 0.92));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.75);
}

.timeline-page .era-spotlight-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.35rem;
}

.timeline-page .era-spotlight-head strong {
  font-family: "Fraunces", serif;
  font-size: 1.45rem;
  color: var(--accent-ink);
}

.timeline-page .era-spotlight-head span {
  display: inline-flex;
  padding: 0.28rem 0.55rem;
  border-radius: 999px;
  background: rgba(31, 95, 152, 0.1);
  color: #1f5f98;
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.timeline-page .era-spotlight-card h3 {
  margin-bottom: 0.5rem;
  font-size: 1.02rem;
  line-height: 1.25;
}

.timeline-page .era-spotlight-card > p {
  margin: 0 0 0.55rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.timeline-page .era-spotlight-meta {
  margin: 0.3rem 0 0;
  font-size: 0.78rem;
}

.timeline-page .era-rail-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.8rem;
}

.timeline-page .era-rail-head span {
  color: var(--muted);
  font-size: 0.73rem;
}

.timeline-page .era-markers {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(132px, 1fr);
  gap: 0.7rem;
  overflow-x: auto;
  padding: 0.1rem 0 0.25rem;
  scrollbar-width: thin;
}

.timeline-page .era-marker {
  display: grid;
  gap: 0.3rem;
  min-height: 108px;
  padding: 0.9rem 0.85rem;
  border: 1px solid rgba(22, 63, 107, 0.1);
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(245, 248, 252, 0.88));
  text-align: left;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease, box-shadow 160ms ease, opacity 160ms ease;
  position: relative;
  overflow: hidden;
}

.timeline-page .era-marker::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: linear-gradient(90deg, rgba(31, 95, 152, 0.95), rgba(86, 152, 199, 0.7));
  opacity: 0.36;
}

.timeline-page .era-marker span {
  font-family: "Fraunces", serif;
  font-size: 1rem;
  color: var(--accent-ink);
}

.timeline-page .era-marker small {
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.35;
}

.timeline-page .era-marker.is-era-past {
  background: linear-gradient(180deg, rgba(242, 248, 255, 0.96), rgba(235, 244, 253, 0.92));
}

.timeline-page .era-marker.is-era-active {
  transform: translateY(-2px);
  border-color: rgba(31, 95, 152, 0.32);
  background: linear-gradient(180deg, rgba(255, 255, 255, 1), rgba(232, 243, 255, 0.96));
  box-shadow: 0 12px 26px rgba(31, 95, 152, 0.14);
}

.timeline-page .era-marker.is-era-active::before {
  opacity: 1;
}

.timeline-page .journey-strip {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  padding: 0.5rem 0 0.2rem;
}

.timeline-page .journey-strip::before {
  content: "";
  position: absolute;
  top: 1rem;
  left: 12%;
  right: 12%;
  height: 2px;
  background: linear-gradient(90deg, rgba(22, 63, 107, 0.16), rgba(22, 63, 107, 0.45), rgba(22, 63, 107, 0.16));
}

.timeline-page .journey-step-card {
  position: relative;
  padding: 1.2rem 1rem 1rem;
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(242, 246, 251, 0.92));
  border: 1px solid rgba(22, 63, 107, 0.12);
  box-shadow: 0 14px 28px rgba(20, 32, 45, 0.07);
}

.timeline-page .journey-step-card::before {
  content: "";
  position: absolute;
  top: -0.15rem;
  left: 50%;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  transform: translateX(-50%);
  background: #fff;
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 6px rgba(22, 63, 107, 0.08);
}

.timeline-page .journey-step-index {
  display: inline-flex;
  margin-bottom: 0.55rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.timeline-page .timeline-immersive {
  position: relative;
  padding-top: 2rem;
}

.timeline-page .era-bands {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.9rem;
  margin: 0 0 1.2rem;
}

.timeline-page .era-band {
  padding: 0.95rem 0.95rem 0.9rem;
  border-radius: 20px;
  border: 1px solid rgba(22, 63, 107, 0.12);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(242, 246, 251, 0.9));
  box-shadow: 0 10px 20px rgba(20, 32, 45, 0.05);
  position: relative;
  overflow: hidden;
}

.timeline-page .era-band::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: linear-gradient(180deg, rgba(31, 95, 152, 0.9), rgba(86, 152, 199, 0.45));
}

.timeline-page .era-band-range {
  display: inline-flex;
  margin-bottom: 0.35rem;
  color: var(--accent);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.timeline-page .era-band h3 {
  margin-bottom: 0.35rem;
  font-size: 0.95rem;
}

.timeline-page .era-band p {
  margin: 0;
  font-size: 0.76rem;
  line-height: 1.45;
  color: var(--muted);
}

.timeline-page [data-timeline-section="scientific"] .section-heading {
  margin-bottom: 1rem;
}

.timeline-page .timeline-tools {
  position: static;
  margin-bottom: 1rem;
  padding: 1rem;
  border-radius: 18px;
  background:
    linear-gradient(180deg, rgba(250, 252, 255, 0.98), rgba(241, 246, 252, 0.94));
  box-shadow: 0 12px 24px rgba(20, 32, 45, 0.08);
}

.timeline-page .timeline-search {
  min-width: 320px;
}

.timeline-page .center-grid[data-timeline-grid] {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  padding: 0.25rem 0;
}

.timeline-page .center-grid[data-timeline-grid] .center-card {
  width: auto;
  min-height: 100%;
  padding: 1.05rem 1.1rem 1rem;
  border-radius: 20px;
  border: 1px solid rgba(22, 63, 107, 0.08);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.99), rgba(245, 248, 252, 0.95));
  box-shadow: 0 12px 26px rgba(20, 32, 45, 0.06);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease, opacity 180ms ease, filter 180ms ease;
}

.timeline-page .center-grid[data-timeline-grid] .center-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 34px rgba(20, 32, 45, 0.1);
}

.timeline-page .center-grid[data-timeline-grid] .center-card.is-era-past {
  opacity: 0.9;
}

.timeline-page .center-grid[data-timeline-grid] .center-card.is-era-current {
  border-color: rgba(31, 95, 152, 0.28);
}

.timeline-page .center-grid[data-timeline-grid] .center-card.is-era-active {
  transform: translateY(-2px);
  box-shadow: 0 20px 42px rgba(20, 32, 45, 0.12);
  border-color: rgba(31, 95, 152, 0.38);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 1), rgba(239, 246, 255, 0.98));
}

.timeline-page .center-grid[data-timeline-grid] .center-card.is-era-future {
  opacity: 0.48;
  filter: saturate(0.72);
}

.timeline-page .center-grid[data-timeline-grid] .center-card::before {
  height: 5px;
  background: linear-gradient(90deg, rgba(31, 95, 152, 0.95), rgba(86, 152, 199, 0.7));
}

.timeline-page .center-grid[data-timeline-grid] .center-card > h3 {
  display: inline-flex;
  align-items: center;
  margin-bottom: 0.8rem;
  padding: 0.32rem 0.62rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-size: 0.82rem;
}

.timeline-page .timeline-record {
  gap: 0.55rem;
}

.timeline-page .timeline-record p,
.timeline-page .record-meta p {
  font-size: 0.84rem;
}

.timeline-page .record-meta {
  margin-top: 0.95rem;
  padding-top: 0.85rem;
}

.timeline-page .timeline-ids {
  margin-top: 0.2rem;
}

.timeline-page .timeline-chip {
  background: rgba(232, 238, 246, 0.8);
  border-color: rgba(22, 63, 107, 0.12);
  color: var(--accent-ink);
  font-size: 0.72rem;
}

.timeline-page .timeline-table-wrap {
  margin-top: 1.4rem;
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid rgba(22, 63, 107, 0.08);
  box-shadow: 0 18px 34px rgba(20, 32, 45, 0.07);
}

.timeline-page .timeline-table th,
.timeline-page .timeline-table td {
  font-size: 0.82rem;
}

.timeline-page .timeline-table tbody tr:hover {
  background: rgba(232, 238, 246, 0.46);
}

.illustration-card img,
.hero-asset img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
}

.hero-asset {
  margin-top: 0.4rem;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.source-columns {
  columns: 2;
  column-gap: 2rem;
}

.source-columns li {
  break-inside: avoid;
  margin-bottom: 0.85rem;
}

@media (max-width: 1080px) {
  .timeline-grid,
  .applications-grid,
  .ethics-grid,
  .risk-list,
  .rich-grid,
  .hero-overview,
  .page-links,
  .illustration-grid,
  .center-grid,
  .criteria-grid,
  .method-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .timeline-page .center-grid[data-timeline-grid] {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .timeline-page .journey-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .timeline-page .era-bands {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .timeline-page .journey-strip::before {
    left: 8%;
    right: 8%;
  }
}

@media (max-width: 900px) {
  .hero,
  .split-section,
  .dual-column,
  .types-grid,
  .pathway-grid,
  .glossary-grid,
  .myths-grid,
  .experts-grid,
  .timeline-grid,
  .applications-grid,
  .ethics-grid,
  .risk-list,
  .rich-grid,
  .page-links,
  .illustration-grid,
  .center-grid,
  .criteria-grid,
  .method-grid {
    grid-template-columns: 1fr;
  }

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

  .timeline-page .hero,
  .timeline-page .method-grid,
  .timeline-page .journey-strip,
  .timeline-page .era-bands,
  .timeline-page .era-spotlight,
  .timeline-page .center-grid[data-timeline-grid] {
    grid-template-columns: 1fr;
  }

  .timeline-page .era-scrubber-head {
    flex-direction: column;
    align-items: start;
  }

  .timeline-page .era-readout {
    justify-items: start;
    text-align: left;
  }

  .timeline-page .journey-strip::before {
    display: none;
  }

  .header-tools {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
  }

  .search-filters {
    flex-direction: column;
  }

  .hero-overview {
    grid-template-columns: 1fr;
  }

  .index-strip { top: 98px; }
  .hero-panel { min-height: 220px; }

  .timeline-page .timeline-tools {
    position: static;
  }
}

@media (max-width: 640px) {
  .page-shell { width: min(calc(100% - 1.2rem), var(--max)); }
  .hero { padding-top: 1.5rem; }
  h1 { max-width: none; }
  .button { width: 100%; }
  .signal-row { flex-direction: column; }
  .hero-card { max-width: none; }
  .index-strip { top: 108px; }
  .source-columns { columns: 1; }
}

.site-footer {
  margin-top: 2.5rem;
  padding: 1.4rem 0 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.2rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
}

.footer-nav a,
.footer-contact a {
  color: var(--muted);
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-underline-offset: 2px;
}

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

.footer-note {
  flex-basis: 100%;
  font-size: 0.76rem;
  opacity: 0.85;
}

@media (max-width: 640px) {
  .footer-inner { flex-direction: column; align-items: flex-start; }
}

.legal-page main { max-width: 780px; }
.legal-page h2 { margin-top: 1.8rem; }
.legal-page p, .legal-page li { color: var(--text); line-height: 1.6; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel-strong);
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--accent-ink);
  border-radius: 2px;
  transition: transform 160ms ease, opacity 160ms ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .header-tools {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    padding-top: 0.8rem;
    margin-top: 0.2rem;
  }

  .header-tools.is-open {
    display: flex;
  }

  .top-nav a,
  .index-strip a {
    padding: 0.55rem 0.5rem;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  .lang-switch a {
    padding: 0.5rem 0.9rem;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    border: 1px solid var(--line);
  }
}

.hero-photo {
  margin: 0 0 0.7rem;
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(22, 63, 107, 0.12);
  box-shadow: 0 8px 18px rgba(24, 33, 43, 0.05);
}

.hero-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.hero-photo figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.35rem 0.65rem;
  font-size: 0.6rem;
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.94);
  background: linear-gradient(0deg, rgba(12, 26, 40, 0.78), rgba(12, 26, 40, 0));
}

.hero-photo figcaption a {
  color: #fff;
  text-decoration: underline;
  text-decoration-color: rgba(255, 255, 255, 0.5);
}

.section-photo {
  margin: 0 0 1rem;
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(22, 63, 107, 0.12);
  box-shadow: var(--shadow);
}

.section-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.section-photo figcaption {
  padding: 0.55rem 0.7rem;
  font-size: 0.68rem;
  line-height: 1.4;
  color: var(--muted);
  background: var(--panel-strong);
  border-top: 1px solid var(--line);
}

.section-photo figcaption a {
  color: var(--accent);
}

.readiness-chart {
  margin: 0.9rem 0 0;
  padding: 1.1rem 1.25rem 0.9rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.readiness-chart svg {
  display: block;
  width: 100%;
  height: auto;
}

.readiness-chart .chart-caption {
  margin: 0.6rem 0 0;
  font-size: 0.72rem;
  color: var(--muted);
}

@media (max-width: 900px) {
  .hero-photo img,
  .section-photo img {
    aspect-ratio: 16 / 10;
  }
}

.illustration-grid {
  grid-template-columns: 1fr;
  gap: 1.4rem;
}

.illustration-card {
  padding: 1rem;
}


.lang-switch a {
  padding: 0.32rem 0.62rem;
  font-size: 0.74rem;
  font-weight: 700;
}

.site-search input {
  padding: 0.5rem 0.75rem;
  border-radius: 12px;
  font-size: 0.78rem;
}

.search-filters select {
  padding: 0.4rem 0.6rem;
  border-radius: 10px;
  font-size: 0.74rem;
  min-width: 120px;
}

.top-nav a {
  padding: 0.3rem 0;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.82rem;
  transition: color 200ms ease;
}

.top-nav a:hover,
.top-nav a:focus-visible {
  color: var(--accent-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.nav-sep {
  color: var(--line);
  font-weight: 400;
  margin: 0 0.15rem;
}

@media (max-width: 900px) {
  .top-nav a {
    padding: 0.5rem 0;
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    font-size: 0.9rem;
  }
}