:root {
  --paper: rgba(255, 251, 244, 0.9);
  --ink: #1f1d1a;
  --muted: #6d655c;
  --line: rgba(53, 42, 25, 0.14);
  --accent: #9d3c22;
  --shadow: 0 20px 60px rgba(59, 43, 19, 0.12);
  --display: "Cormorant Garamond", serif;
  --body: "Manrope", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--body);
  background:
    radial-gradient(circle at top left, rgba(157, 60, 34, 0.14), transparent 26%),
    radial-gradient(circle at right 20%, rgba(122, 92, 43, 0.15), transparent 22%),
    linear-gradient(180deg, #f7f2ea 0%, #f1e8da 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image: linear-gradient(rgba(80, 54, 23, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(80, 54, 23, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.55), transparent 75%);
}

.page-shell {
  width: min(2200px, calc(100vw - clamp(24px, 3vw, 72px)));
  margin: clamp(14px, 1.8vw, 28px) auto 60px;
}

.timeline {
  position: relative;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.timeline {
  padding: clamp(22px, 2vw, 34px);
}

.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.section-kicker,
.era-period {
  margin: 0;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 700;
}

.section-head h2,
.era-title {
  font-family: var(--display);
}

.section-head h2 {
  margin: 8px 0 0;
  font-size: clamp(2rem, 3vw, 3.4rem);
  line-height: 1;
}

.section-credit {
  margin: 4px 0 0;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
  white-space: nowrap;
}

.era-card {
  background: rgba(255, 252, 247, 0.82);
  border: 1px solid var(--line);
  border-radius: 22px;
}

.era-summary,
.era-details dd,
.country-summary,
.country-details dd {
  color: var(--muted);
}

.timeline-controls {
  margin-top: 22px;
}

.timeline-tabs-shell {
  display: block;
}

.timeline-tabs-viewport {
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  scroll-behavior: smooth;
}

.timeline-tabs-viewport::-webkit-scrollbar {
  display: none;
}

.timeline-tabs {
  display: flex;
  gap: 10px;
  flex-wrap: nowrap;
  width: max-content;
}

.timeline-tab {
  border: 1px solid var(--line);
  background: rgba(255, 252, 247, 0.8);
  color: var(--ink);
  padding: 12px 16px;
  border-radius: 20px;
  cursor: pointer;
  font: inherit;
  display: grid;
  gap: 4px;
  text-align: left;
  min-width: 132px;
}

.timeline-tab-title {
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.15;
}

.timeline-tab-caption {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.2;
}

.timeline-tab.active {
  background: var(--ink);
  color: #fff9f2;
  border-color: var(--ink);
}

.timeline-tab.active .timeline-tab-caption {
  color: rgba(255, 249, 242, 0.74);
}

.country-board {
  margin-top: 20px;
}

.country-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.country-tab {
  border: 1px solid var(--line);
  background: rgba(255, 249, 242, 0.86);
  color: var(--ink);
  padding: 14px 16px;
  border-radius: 18px;
  cursor: pointer;
  font: inherit;
  display: grid;
  gap: 4px;
  text-align: left;
  min-width: 180px;
}

.country-tab.active {
  background: var(--ink);
  color: #fff9f2;
  border-color: var(--ink);
}

.country-tab-name {
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.2;
}

.country-tab-role {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.2;
}

.country-tab.active .country-tab-role {
  color: rgba(255, 249, 242, 0.74);
}

.era-details dt {
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.era-grid {
  position: relative;
  display: grid;
  margin-top: 28px;
  gap: 24px;
  padding-left: 64px;
}

.era-grid::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(
    180deg,
    rgba(157, 60, 34, 0.12),
    rgba(157, 60, 34, 0.55),
    rgba(157, 60, 34, 0.12)
  );
}

.era-card {
  position: relative;
  padding: clamp(22px, 1.8vw, 30px);
  display: grid;
  gap: 24px;
  align-items: start;
}

.era-card::before {
  content: "";
  position: absolute;
  left: -52px;
  top: 28px;
  width: 16px;
  height: 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, #9d3c22, #d08a5f);
  box-shadow: 0 0 0 6px rgba(157, 60, 34, 0.12);
}

.era-card::after {
  content: "";
  position: absolute;
  left: -36px;
  top: 35px;
  width: 20px;
  height: 1px;
  background: rgba(157, 60, 34, 0.34);
}

.era-period {
  font-weight: 800;
}

.era-tag {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin-top: 0;
  padding: 0;
  border-radius: 0;
  background: transparent;
  color: var(--accent);
  width: auto;
}

.era-tag-raw,
.era-tag-zh {
  line-height: 1.2;
}

.era-tag-raw {
  font-size: 0.82rem;
  font-weight: 700;
}

.era-tag-zh {
  font-size: 0.82rem;
  color: var(--accent);
}

.era-head {
  display: grid;
  gap: 18px;
}

.era-head-meta {
  display: grid;
  gap: 6px;
}

.era-structure-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.era-title {
  margin: 0;
  font-size: clamp(2rem, 2.6vw, 3rem);
  line-height: 1.12;
  overflow-wrap: anywhere;
}

.era-title.script-thai,
.era-title.script-khmer,
.era-title.script-lao,
.era-title.script-myanmar,
.era-title.script-devanagari {
  line-height: 1.12;
}

.era-title.script-myanmar {
  line-height: 1.12;
}

.era-title.script-khmer {
  line-height: 1.12;
}

.era-info-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
}

.era-info-card {
  display: grid;
  gap: 10px;
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(255, 249, 242, 0.7);
  border: 1px solid rgba(53, 42, 25, 0.08);
  align-content: start;
  min-height: 100%;
}

.era-info-card dt {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.era-info-card dd {
  margin: 0;
  line-height: 1.8;
  font-size: 1rem;
  color: var(--muted);
}

.faces {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.era-info-card-faces {
  background:
    linear-gradient(180deg, rgba(157, 60, 34, 0.06), rgba(157, 60, 34, 0.03)),
    rgba(255, 249, 242, 0.78);
  border-color: rgba(157, 60, 34, 0.12);
}

.era-face {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 12px;
  border-radius: 12px;
  background: rgba(53, 42, 25, 0.05);
  border: 1px solid rgba(53, 42, 25, 0.08);
  color: var(--ink);
  font-weight: 700;
  line-height: 1.35;
}

.era-structure-tag {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 12px;
  border-radius: 12px;
  background: rgba(53, 42, 25, 0.05);
  border: 1px solid rgba(53, 42, 25, 0.08);
  color: var(--ink);
  font-weight: 700;
  line-height: 1.35;
}

@media (max-width: 980px) {
  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .section-credit {
    margin-top: -6px;
  }

  .country-tabs {
    display: grid;
    grid-template-columns: 1fr;
  }

  .era-grid {
    padding-left: 44px;
  }

  .era-grid::before {
    left: 14px;
  }

  .era-card {
    gap: 18px;
  }

  .era-card::before {
    left: -36px;
  }

  .era-card::after {
    left: -20px;
  }

  .era-info-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: calc(100% - 20px);
    margin: 10px auto 40px;
  }

  .timeline {
    border-radius: 22px;
    padding-left: 16px;
    padding-right: 16px;
  }

  .era-grid {
    padding-left: 28px;
  }

  .era-grid::before {
    left: 8px;
  }

  .era-card::before {
    left: -22px;
    width: 12px;
    height: 12px;
  }

  .era-card::after {
    left: -10px;
    width: 10px;
  }
}