:root{
  --bg:#f4f1ea;
  --paper:#fffdfa;
  --panel:#faf7f1;
  --line:#d9d0c2;
  --text:#2c332d;
  --muted:#667069;
  --accent:#7e8f72;
  --accent-2:#c8a96b;
  --shadow:0 18px 44px rgba(63,56,43,.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(126,143,114,.16), transparent 24rem),
    radial-gradient(circle at top right, rgba(200,169,107,.15), transparent 26rem),
    linear-gradient(180deg,#fefcf8,var(--bg));
  line-height:1.82;
}
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(255,252,248,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(44,51,45,.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:rgba(126,143,114,.13);color:var(--text)}
.topbar .brand{font-weight:700}
main{width:min(1180px,calc(100% - 32px));margin:0 auto;padding:28px 0 56px}
.hero,.panel,.card,.deep-card,.path-panel,.metric,.viewer,.plate-hero{background:rgba(255,253,250,.92);border:1px solid rgba(217,208,194,.8);box-shadow:var(--shadow)}
.hero{display:grid;grid-template-columns:1.25fr .95fr;gap:20px;padding:28px;border-radius:28px}
.hero h1{margin:10px 0 14px;font-size:clamp(2rem,4vw,3.5rem);line-height:1.08}
.hero p{margin:0;color:var(--muted)}
.tag-row{display:flex;gap:10px;flex-wrap:wrap}
.tag,.chip{display:inline-flex;align-items:center;border-radius:999px;padding:7px 12px;font-size:.9rem}
.tag{background:rgba(126,143,114,.15);color:#465042}
.chip{background:rgba(200,169,107,.16);color:#6f5a31}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px;margin-top:22px}
.card,.panel,.deep-card,.metric,.viewer{border-radius:24px;padding:18px}
.card h2,.panel h2,.deep-card h3{margin:0 0 10px}
.card p,.panel p,.deep-card p,.metric span,.eyebrow,.lead,.path-panel p{margin:0;color:var(--muted)}
.lead{font-size:1.04rem}
.metrics{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:14px;margin-top:18px}
.metric strong{display:block;font-size:1.8rem}
.layout{display:grid;grid-template-columns:minmax(0,1.24fr) minmax(280px,.76fr);gap:20px;margin-top:24px}
.single-column{display:grid;gap:16px}
.thumb-frame,.chapter-card-figure,.plate-thumb,.viewer-thumb{display:block;background:#f7f3ec;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{width:100%;aspect-ratio:1.35/1;object-fit:contain;background:#fff}
.chapter-card-figure{margin-bottom:12px}
.plain-list,.route-list,.mini-list{display:grid;gap:8px;padding-left:18px}
.route-list li,.plain-list li,.mini-list li{padding-left:4px}
.eyebrow{text-transform:uppercase;letter-spacing:.08em;font-size:.78rem}
.path-panel{display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;padding:16px 18px;border-radius:22px;margin:20px 0}
.path-panel .actions{display:flex;flex-wrap:wrap;gap:10px}
.button,.ghost{display:inline-flex;align-items:center;justify-content:center;padding:11px 16px;border-radius:999px}
.button{background:var(--accent);color:#fff}
.ghost{background:#eef2ea;color:var(--text)}
.viewer{display:grid;gap:14px}
.viewer main{width:auto;margin:0;padding:0}
.viewer-strip{display:grid;grid-template-columns:repeat(auto-fit,minmax(92px,1fr));gap:10px}
.viewer-thumb{cursor:pointer}
.viewer-thumb.active{outline:2px solid var(--accent)}
.plate-path-group{margin-top:14px;padding-top:14px;border-top:1px solid rgba(217,208,194,.8)}
.plate-path-group:first-child{margin-top:0;padding-top:0;border-top:none}
.sticky{position:sticky;top:84px;align-self:start}
.pager{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:8px}
.plate-hero{padding:20px;border-radius:24px}
.plate-full{width:100%;max-height:76vh;object-fit:contain;background:#fff}
.search-input{width:100%;border:1px solid var(--line);border-radius:999px;padding:13px 16px;font:inherit;background:#fff}
.mosaic{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:18px}
.plate-card-home h3{margin:12px 0 8px}
details{border:1px dashed rgba(126,143,114,.4);border-radius:18px;padding:12px 14px;background:rgba(126,143,114,.06)}
summary{cursor:pointer;font-weight:600}
footer{padding:28px 0 14px;color:var(--muted);text-align:center}
@media (max-width: 900px){
  .hero,.layout{grid-template-columns:1fr}
  .sticky{position:static}
}