:root{
  --paper:#f3f6f5;
  --paper-2:#fbfcfb;
  --ink:#1b2622;
  --muted:#5c6c65;
  --line:#cdd6d1;
  --accent:#2d7b76;
  --accent-2:#d6853c;
  --accent-3:#895fb7;
  --shadow:0 24px 60px rgba(27,38,34,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:
    radial-gradient(circle at top left, rgba(45,123,118,.13), transparent 28rem),
    radial-gradient(circle at top right, rgba(214,133,60,.12), transparent 22rem),
    linear-gradient(180deg,#fbfcfb 0%,#eef3f1 48%,#f9fbfa 100%);
  line-height:1.82;
}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%}
.topbar{
  position:sticky;top:0;z-index:30;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px 20px;background:rgba(251,252,251,.88);
  border-bottom:1px solid rgba(27,38,34,.08);backdrop-filter:blur(14px)
}
.brand{font-weight:800;letter-spacing:.02em}
.topbar nav{display:flex;gap:10px;flex-wrap:wrap}
.topbar nav a{padding:8px 12px;border-radius:999px;color:var(--muted);font-size:.95rem}
.topbar nav a.active,.topbar nav a:hover{background:rgba(45,123,118,.12);color:var(--ink)}
main{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:28px 0 60px}
.hero,.panel,.card,.deep-card,.path-panel,.metric,.viewer,.plate-hero,.question-card,details,.reading-card{
  background:rgba(251,252,251,.92);border:1px solid rgba(205,214,209,.85);box-shadow:var(--shadow)
}
.hero{
  display:grid;grid-template-columns:1.15fr .95fr;gap:22px;
  padding:28px;border-radius:28px
}
.hero h1{margin:8px 0 16px;font-size:clamp(2rem,4vw,3.4rem);line-height:1.06}
.hero p{margin:0;color:var(--muted)}
.tag-row{display:flex;gap:10px;flex-wrap:wrap}
.tag,.chip{
  display:inline-flex;align-items:center;padding:7px 12px;border-radius:999px;
  font-size:.92rem
}
.tag{background:rgba(45,123,118,.12);color:#256862}
.chip{background:rgba(214,133,60,.14);color:#9f6124}
.hero-image{
  border-radius:22px;overflow:hidden;min-height:320px;background:linear-gradient(135deg,#dbe9e4,#f7f1e7);
  display:flex;align-items:center;justify-content:center;padding:18px
}
.hero-image img{width:100%;height:100%;object-fit:contain}
.metric-grid,.grid{display:grid;gap:18px}
.metric-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));margin-top:22px}
.metric,.card,.panel,.question-card,.path-panel,.viewer,.plate-hero{border-radius:24px}
.metric{padding:18px 18px 20px}
.metric strong{display:block;font-size:2rem;line-height:1.05}
.metric span{color:var(--muted)}
.section{margin-top:30px}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:16px}
.section-head h2{margin:0;font-size:1.42rem}
.section-head p{margin:0;color:var(--muted);max-width:760px}
.grid{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.card{overflow:hidden}
.card-body{padding:18px}
.card-media{
  aspect-ratio:1/1;background:#eef3f2;padding:16px;display:flex;align-items:center;justify-content:center;
}
.card-media img,.thumb-frame img{width:100%;height:100%;object-fit:contain}
.eyebrow{font-size:.83rem;letter-spacing:.06em;text-transform:uppercase;color:var(--accent);font-weight:700}
.card h3,.panel h3,.viewer h3,.question-card h3{margin:8px 0 10px;line-height:1.3}
.card p,.panel p,.viewer p,.question-card p{margin:0;color:var(--muted)}
.bullet-list,.text-list{margin:12px 0 0;padding-left:20px}
.bullet-list li,.text-list li{margin:6px 0}
.cluster{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
.panel{padding:22px}
.chapter-shell,.concept-shell,.plate-shell{display:grid;grid-template-columns:1.12fr .88fr;gap:22px}
.stack{display:grid;gap:16px}
.reading-card{padding:18px;border-radius:20px}
.reading-card h4{margin:0 0 8px}
.muted{color:var(--muted)}
.mini-route{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.mini-route a{padding:8px 12px;border-radius:999px;background:rgba(137,95,183,.12);color:#6f48a7;font-size:.9rem}
.viewer{padding:18px}
.viewer-stage{
  aspect-ratio:1/1;background:#eef3f2;border-radius:18px;padding:14px;
  display:flex;align-items:center;justify-content:center;overflow:hidden
}
.viewer-stage img{width:100%;height:100%;object-fit:contain}
.viewer-stage p{margin:0}
.viewer-strip{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:14px}
.plate-mini{
  border:1px solid rgba(205,214,209,.95);border-radius:18px;padding:8px;background:#f8fbfa;cursor:pointer
}
.plate-mini.active{border-color:rgba(45,123,118,.55);box-shadow:0 10px 20px rgba(45,123,118,.13)}
.plate-mini .thumb-frame{
  aspect-ratio:1/1;background:#eef3f2;border-radius:12px;padding:8px;display:flex;align-items:center;justify-content:center
}
.plate-mini strong{display:block;margin-top:8px;font-size:.92rem;line-height:1.35}
.path-links{display:flex;gap:12px;flex-wrap:wrap}
.path-links a{padding:10px 14px;border-radius:999px;background:rgba(45,123,118,.11);color:#236a65}
.question-card{padding:18px}
details{padding:14px 16px;border-radius:18px}
details summary{cursor:pointer;font-weight:700}
.plate-hero{padding:20px}
.plate-figure{
  aspect-ratio:4/3;background:#eef3f2;padding:18px;border-radius:20px;
  display:flex;align-items:center;justify-content:center;overflow:hidden
}
.plate-figure img{width:100%;height:100%;object-fit:contain}
.plate-card{display:block}
.plate-card .card-body{padding:16px}
.glossary-table{display:grid;gap:12px}
.glossary-row{
  display:grid;grid-template-columns:1.1fr .9fr 2fr;gap:12px;
  padding:14px 16px;border-radius:18px;background:rgba(251,252,251,.92);border:1px solid rgba(205,214,209,.8)
}
.footer-note{margin-top:30px;color:var(--muted);font-size:.95rem}
@media (max-width: 980px){
  .hero,.chapter-shell,.concept-shell,.plate-shell,.cluster{grid-template-columns:1fr}
}
@media (max-width: 680px){
  main{width:min(100% - 20px,1180px)}
  .topbar{padding:12px 14px}
  .hero{padding:18px;border-radius:22px}
  .panel,.viewer,.question-card,.plate-hero,.metric,.card{border-radius:20px}
  .viewer-strip{grid-template-columns:repeat(2,minmax(0,1fr))}
  .glossary-row{grid-template-columns:1fr}
}