:root {
  --bg: #f6f1e7;
  --panel: #fffaf2;
  --panel-strong: #f1e5cf;
  --ink: #1f2428;
  --muted: #635b4f;
  --line: #d9c9ab;
  --accent: #8f4d1d;
  --accent-soft: #efe0c7;
  --shadow: 0 16px 40px rgba(72, 49, 20, 0.08);
  --radius: 8px;
  --max: 1220px;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "PingFang SC", "Noto Serif SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(199, 166, 111, 0.18), transparent 28%),
    linear-gradient(180deg, #f8f3ea 0%, #f3ede1 48%, #efe5d3 100%);
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.site-header {
  border-bottom: 1px solid rgba(143, 77, 29, 0.18);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(246, 241, 231, 0.88);
}
.site-header-inner, .page-shell, .foot-inner {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
}
.site-header-inner {
  display: flex;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
  min-height: 68px;
}
.brand { font-size: 14px; letter-spacing: 0; color: var(--muted); }
.nav-links { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; }
.page-shell { padding: 28px 0 56px; }
.hero {
  display: grid;
  grid-template-columns: 1.35fr 0.95fr;
  gap: 26px;
  align-items: stretch;
}
.hero-copy, .hero-visual, .panel, .reading-card, .plate-card, .concept-card, .chapter-card, .glossary-card {
  background: rgba(255, 250, 242, 0.92);
  border: 1px solid rgba(143, 77, 29, 0.14);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.hero-copy { padding: 28px; }
.eyebrow { font-size: 13px; color: var(--accent); font-weight: 700; text-transform: uppercase; }
h1, h2, h3 { margin: 0; line-height: 1.18; letter-spacing: 0; }
h1 { font-family: "Songti SC", "STSong", serif; font-size: clamp(34px, 4vw, 54px); margin-top: 12px; }
h2 { font-size: 26px; }
h3 { font-size: 19px; }
.hero-copy p, .panel p, .reading-card p, .concept-card p, .plate-card p, .glossary-card p, li {
  line-height: 1.72;
  color: var(--muted);
}
.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 20px;
}
.metric {
  padding: 14px;
  background: var(--accent-soft);
  border-radius: 8px;
}
.metric strong { display: block; font-size: 24px; color: var(--accent); }
.hero-visual {
  padding: 18px;
  display: grid;
  gap: 14px;
}
.cover-band {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.cover-band img, .card-thumb, .plate-thumb, .viewer-thumb {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: contain;
  background: #f5efe3;
  border-radius: 8px;
  border: 1px solid rgba(143, 77, 29, 0.12);
  padding: 10px;
}
.section-block { margin-top: 26px; }
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  margin-bottom: 14px;
}
.section-head p { margin: 0; }
#chapterGrid, .concept-grid, .plate-grid, .glossary-grid {
  display: grid;
  gap: 16px;
}
#chapterGrid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.concept-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.plate-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.glossary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.chapter-card, .concept-card, .plate-card, .glossary-card { overflow: hidden; }
.card-copy { padding: 18px; }
.card-badges, .meta-line, .breadcrumb, .path-links, .foot-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 6px 10px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
}
.panel { padding: 20px; }
.page-title { margin-bottom: 18px; }
.page-subtitle { margin-top: 10px; font-size: 17px; }
.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(300px, 0.86fr);
  gap: 24px;
}
.reading-stack { display: grid; gap: 16px; }
.reading-card { padding: 18px; }
.reading-card h3 { margin-bottom: 10px; }
.reading-card details {
  margin-top: 10px;
  border-top: 1px dashed var(--line);
  padding-top: 10px;
}
.knowledge-route {
  display: grid;
  gap: 10px;
  padding-left: 20px;
}
.viewer-panel {
  position: sticky;
  top: 92px;
  display: grid;
  gap: 14px;
}
.viewer-main {
  background: #f7f1e7;
  border: 1px solid rgba(143, 77, 29, 0.12);
  border-radius: 8px;
  padding: 14px;
}
.viewer-main img {
  width: 100%;
  max-height: 380px;
  object-fit: contain;
  background: #fff;
  border-radius: 6px;
}
.viewer-caption { margin-top: 10px; }
.thumb-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.thumb-button {
  border: 0;
  background: transparent;
  padding: 0;
  text-align: left;
  cursor: pointer;
}
.thumb-button span {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-top: 6px;
}
.plate-full {
  width: 100%;
  max-height: 720px;
  object-fit: contain;
  background: #fff;
  border-radius: 8px;
  border: 1px solid rgba(143, 77, 29, 0.12);
  padding: 14px;
}
.path-panel, .foot-panel {
  padding: 16px 18px;
  background: rgba(255, 250, 242, 0.88);
  border: 1px solid rgba(143, 77, 29, 0.12);
  border-radius: 8px;
  margin-bottom: 18px;
}
.foot-panel { margin-top: 28px; }
.two-col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.mini-list {
  display: grid;
  gap: 10px;
}
.mini-list a, .route-link {
  display: block;
  padding: 12px 14px;
  border-radius: 8px;
  background: #f8f1e3;
  border: 1px solid rgba(143, 77, 29, 0.12);
}
.foot-inner {
  padding: 0 0 40px;
}
@media (max-width: 980px) {
  .hero, .content-layout, .two-col {
    grid-template-columns: 1fr;
  }
  .concept-grid, .plate-grid, #chapterGrid, .glossary-grid {
    grid-template-columns: 1fr;
  }
  .hero-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .viewer-panel {
    position: static;
  }
}