:root {
  --bg: #f3ecdf;
  --bg-2: #fff9f1;
  --ink: #1e1a17;
  --muted: #5e554d;
  --line: rgba(69, 55, 41, 0.15);
  --accent: #855d2f;
  --accent-2: #2f6f6d;
  --card: rgba(255, 250, 243, 0.9);
  --shadow: 0 24px 60px rgba(43, 31, 18, 0.08);
  --radius: 24px;
  --thumb-bg: #f7f0e5;
  --max: 1220px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  font-family: "PingFang SC", "Noto Sans SC", "Helvetica Neue", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(189, 156, 109, 0.18), transparent 28%),
    linear-gradient(180deg, var(--bg), var(--bg-2));
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.page {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
  padding: 28px 0 60px;
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(255, 248, 238, 0.82);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  align-items: center;
}
.brand {
  font-family: "Songti SC", "Noto Serif SC", serif;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.nav-links a,
.pill {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.6);
  color: var(--muted);
  font-size: 0.92rem;
}
.hero,
.card,
.section-card,
.viewer,
.plate-hero,
.question-card,
.glossary-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero {
  padding: 36px;
  display: grid;
  gap: 16px;
  margin-top: 24px;
}
.hero h1,
.chapter-hero h1,
.concept-hero h1,
.plate-hero h1 {
  margin: 0;
  font-family: "Songti SC", "Noto Serif SC", serif;
  line-height: 1.15;
  font-size: clamp(2rem, 4vw, 3.6rem);
}
.hero p,
.chapter-hero p,
.concept-hero p,
.plate-hero p,
.section-card p,
.glossary-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}
.hero-meta,
.stats,
.chip-row,
.path-row,
.actions,
.thumb-strip,
.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.stat {
  min-width: 136px;
  padding: 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid var(--line);
}
.stat strong {
  display: block;
  font-size: 1.5rem;
  margin-bottom: 6px;
}
.path-panel {
  margin-top: 18px;
  color: var(--muted);
  font-size: 0.95rem;
}
.section-title {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  margin: 36px 0 16px;
}
.section-title h2 {
  margin: 0;
  font-size: 1.45rem;
  font-family: "Songti SC", "Noto Serif SC", serif;
}
.grid {
  display: grid;
  gap: 16px;
}
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card,
.section-card,
.glossary-card {
  padding: 18px;
}
.card h3,
.section-card h3,
.glossary-card h3 {
  margin: 0 0 10px;
  font-size: 1.12rem;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}
.chapter-layout,
.concept-layout,
.plate-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(280px, 0.9fr);
  gap: 18px;
  align-items: start;
}
.chapter-hero,
.concept-hero,
.plate-hero {
  padding: 30px;
  margin-top: 24px;
}
.viewer {
  position: sticky;
  top: 86px;
  padding: 18px;
  display: grid;
  gap: 16px;
}
.viewer figure,
.plate-image {
  margin: 0;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--thumb-bg);
  padding: 18px;
}
.viewer figure img,
.plate-image img {
  width: 100%;
  height: auto;
  object-fit: contain;
}
.thumb-strip {
  gap: 12px;
}
.thumb-button {
  width: 94px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.85);
  padding: 8px;
  cursor: pointer;
}
.thumb-button img,
.plate-card img,
.chapter-card img,
.concept-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: contain;
  background: var(--thumb-bg);
  border-radius: 12px;
  padding: 10px;
}
.thumb-button.is-active {
  border-color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(133, 93, 47, 0.2);
}
.list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.8;
}
.route-list {
  display: grid;
  gap: 12px;
}
.route-item {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.62);
}
.route-item strong {
  display: block;
  margin-bottom: 8px;
}
.plate-group {
  padding: 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.65);
  display: grid;
  gap: 12px;
}
.plate-grid,
.chapter-grid,
.concept-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.plate-card,
.chapter-card,
.concept-card {
  display: grid;
  gap: 12px;
}
.question-card {
  padding: 20px;
}
details summary {
  cursor: pointer;
  font-weight: 700;
}
.footer-nav {
  margin-top: 26px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.footer-nav a {
  flex: 1 1 220px;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.66);
}
.glossary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.muted { color: var(--muted); }
.small { font-size: 0.92rem; }
@media (max-width: 960px) {
  .grid-3,
  .grid-2,
  .chapter-grid,
  .concept-grid,
  .plate-grid,
  .glossary-grid,
  .chapter-layout,
  .concept-layout,
  .plate-layout {
    grid-template-columns: 1fr;
  }
  .viewer {
    position: static;
  }
  .hero,
  .chapter-hero,
  .concept-hero,
  .plate-hero {
    padding: 24px;
  }
}