:root{
  --bg:#eef5f4;
  --paper:#fbfdfd;
  --panel:#f7fbfb;
  --line:#c9d8d8;
  --text:#183234;
  --muted:#5b7272;
  --accent:#2d8d8c;
  --accent-2:#7462c7;
  --accent-3:#c9734f;
  --shadow:0 18px 42px rgba(38,68,73,.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(--text);
  background:
    radial-gradient(circle at top left, rgba(45,141,140,.12), transparent 24rem),
    radial-gradient(circle at top right, rgba(116,98,199,.10), transparent 22rem),
    linear-gradient(180deg,#f9fcfb,var(--bg));
  line-height:1.78;
}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%}
.topbar{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:14px 18px;background:rgba(251,253,253,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(24,50,52,.08)}
.topbar nav{display:flex;gap:10px;flex-wrap:wrap}
.topbar nav a{padding:8px 12px;border-radius:999px;color:var(--muted)}
.topbar nav a:hover,.topbar nav a.active{background:var(--paper);color:var(--text)}
.brand{font-weight:850;letter-spacing:.02em}
main{max-width:1280px;margin:0 auto;padding:28px 18px 72px}
.hero,.hero-book,.panel,.card,.deep-card,.path-card{background:rgba(251,253,253,.96);border:1px solid rgba(201,216,216,.92);border-radius:26px;box-shadow:var(--shadow)}
.hero{display:grid;grid-template-columns:1.15fr .9fr;gap:24px;padding:30px;margin-bottom:22px}
.hero-book{display:grid;grid-template-columns:280px 1fr;gap:24px;padding:26px;margin-bottom:22px}
.hero h1,.hero-book h1{margin:0 0 12px;font-size:clamp(2rem,4vw,3.2rem);line-height:1.08}
.hero p,.hero-book p,.panel p,.card p,.panel li,.deep-card p,.path-card p,.muted{color:var(--muted)}
.tag-row,.chip-row{display:flex;gap:10px;flex-wrap:wrap}
.tag,.chip{display:inline-flex;padding:8px 12px;border-radius:999px;font-size:.92rem;font-weight:760}
.tag{background:rgba(45,141,140,.12);color:var(--accent)}
.chip{background:rgba(116,98,199,.12);color:var(--accent-2)}
.button,.ghost{display:inline-flex;align-items:center;gap:8px;padding:11px 15px;border-radius:999px;font-weight:760}
.button{background:linear-gradient(135deg,var(--accent),#45a7a7);color:#fff}
.ghost{border:1px solid var(--line);background:var(--paper)}
.metric-grid,.grid,.plate-grid,.path-grid,.visual-band{display:grid;gap:16px}
.metric-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
.metric,.panel,.card,.path-card{padding:20px}
.metric{background:var(--paper);border:1px solid var(--line);border-radius:22px}
.metric strong{display:block;font-size:1.9rem}
.section-title{margin:28px 0 12px;font-size:1.55rem}
.section-note{margin-top:-4px;color:var(--muted)}
.grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.visual-band{grid-template-columns:repeat(4,minmax(0,1fr))}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 350px;gap:20px}
.stack,.quote-list,.mini-list,.route-list,.plain-list{display:grid;gap:10px}
.sticky{position:sticky;top:84px;display:flex;flex-direction:column;gap:14px}
.thumb-frame,.chapter-card-figure,.plate-thumb,.viewer-thumb{display:block;background:#f2f7f7;border:1px solid var(--line);border-radius:22px;padding:12px;overflow:hidden}
.thumb-frame img,.chapter-card-figure img,.plate-thumb img,.viewer-thumb img,.mini-thumb img,.visual-thumb img{width:100%;aspect-ratio:1.35/1;object-fit:contain;background:#fff}
.visual-thumb{display:block;background:#f2f7f7;border:1px solid var(--line);border-radius:20px;padding:10px}
.card h2,.panel h2,.deep-card h3,.path-card h3{margin:0 0 10px}
.search{width:100%;padding:13px 14px;border-radius:18px;border:1px solid var(--line);background:var(--paper);font-size:1rem}
.deep-card,.source-item-deep{padding:16px}
.viewer-main{background:var(--paper);border:1px solid var(--line);border-radius:24px;padding:18px}
.viewer-main img{width:100%;max-height:58vh;object-fit:contain;background:#fff}
.viewer-caption{margin-top:12px;color:var(--muted);font-size:.95rem}
.viewer-strip{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:14px}
.viewer-thumb{cursor:pointer}
.viewer-thumb.is-active{border-color:var(--accent);box-shadow:0 0 0 2px rgba(45,141,140,.12)}
.plate-path-group{margin-top:14px;padding-top:14px;border-top:1px solid rgba(201,216,216,.7)}
.plate-path-group:first-child{margin-top:0;padding-top:0;border-top:none}
.plate-grid,.path-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.plate-card{padding:18px;border-radius:22px;border:1px solid var(--line);background:var(--paper)}
.plate-detail{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:20px}
.plate-hero{background:var(--paper);border:1px solid var(--line);border-radius:24px;padding:18px}
.plate-full{width:100%;max-height:76vh;object-fit:contain;background:#fff}
.glossary-row{display:grid;grid-template-columns:1.1fr .95fr 2fr;gap:16px;padding:16px 18px;border-radius:18px;border:1px solid var(--line);background:var(--paper)}
.pager{display:flex;justify-content:space-between;gap:12px;margin-top:24px}
.pager a{flex:1}
.mini-thumb{display:flex;align-items:center;justify-content:center;background:#f2f7f7;border:1px solid var(--line);border-radius:14px;padding:8px;min-height:76px}
.plate-mini{display:grid;grid-template-columns:72px 1fr;gap:12px;align-items:center;padding:10px 0;border-top:1px solid rgba(201,216,216,.6)}
.plate-mini:first-child{border-top:none;padding-top:0}
.path-card,.part-card{border:1px solid var(--line);background:var(--paper);border-radius:22px}
.quote-box{padding:14px 16px;border-radius:18px;border:1px solid rgba(201,216,216,.7);background:rgba(247,251,251,.92)}
.quote-box blockquote{margin:0}
.toc-list{display:grid;gap:8px;padding-left:18px}
details{padding:16px 18px;border-radius:18px;border:1px solid var(--line);background:var(--paper)}
summary{cursor:pointer;font-weight:800}
@media (max-width: 980px){
  .hero,.hero-book,.layout,.plate-detail{grid-template-columns:1fr}
  .grid,.visual-band{grid-template-columns:1fr 1fr}
  .metric-grid{grid-template-columns:1fr 1fr}
  .sticky{position:static}
}
@media (max-width: 700px){
  .topbar{align-items:flex-start;flex-direction:column}
  .grid,.grid.two,.plate-grid,.path-grid,.metric-grid,.visual-band,.glossary-row,.viewer-strip{grid-template-columns:1fr}
  .hero,.hero-book,.metric,.card,.panel,.deep-card,.path-card{padding:18px}
  main{padding:18px 14px 56px}
}