:root{
  --bg:#f4f1ea;
  --paper:#fffdfa;
  --line:#d8d0c2;
  --text:#2d2a25;
  --muted:#6e665b;
  --accent:#7a5f37;
  --accent-soft:#efe5d6;
  --green:#62725c;
}
*{box-sizing:border-box}
body{margin:0;font-family:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text)}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.topbar{position:sticky;top:0;z-index:10;display:flex;justify-content:space-between;align-items:center;padding:14px 24px;background:rgba(248,244,237,.93);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{font-weight:800}
.topnav{display:flex;gap:16px;flex-wrap:wrap}
.topnav a{padding:8px 10px;border-radius:999px}
.topnav a:hover{background:var(--paper)}
.page{max-width:1260px;margin:0 auto;padding:28px 22px 72px}
.hero,.detail-hero{display:grid;grid-template-columns:1.08fr .92fr;gap:28px;padding:28px;background:var(--paper);border:1px solid var(--line);border-radius:14px;margin-bottom:22px}
.detail-hero{grid-template-columns:1fr .9fr}
.hero-copy,.hero-visual,.content-block,.chapter-card,.concept-card,.plate-card,.viewer-panel,.source-item-deep,.small-card{background:var(--paper);border:1px solid var(--line);border-radius:8px}
.hero-copy,.hero-visual{padding:22px}
.hero-lead,.chapter-summary,.content-block p,.source-item-deep p,.chapter-card p,.concept-card p,.plate-card p,.small-card p,.source-excerpt,.chapter-source-intro{color:var(--muted);line-height:1.85}
.hero h1,.detail-hero h1{margin:0 0 10px;font-size:38px;line-height:1.15;letter-spacing:0}
.hero-points,.bullet-list,.ordered-points,.concept-expand-list{margin:0;padding-left:20px;line-height:1.8}
.eyebrow{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);margin-bottom:10px}
.hero-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:14px}
.media-frame{background:#f7f2e9;border:1px solid var(--line);border-radius:8px;padding:12px}
.hero-cover-frame,.hero-grid-frame,.plate-thumb,.mini-thumb,.thumb-frame{background:#f7f2e9}
.hero-cover-frame img,.hero-grid-frame img,.plate-card img,.mini-plate img,.thumb-button img{width:100%;object-fit:contain}
.hero-cover-frame img{aspect-ratio:1/1.18}
.hero-grid-frame img{aspect-ratio:1.28/1}
.hero-cover-frame,.hero-grid-frame,.plate-thumb,.mini-thumb,.thumb-frame{padding:10px}
.section-band{margin-top:30px}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:14px}
.route-row{display:flex;flex-wrap:wrap;gap:10px}
.route-row span{display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;background:#f7f2e9;border:1px solid var(--line);color:#534c42}
.card-grid,.plate-showcase,.source-grid,.small-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.chapter-card,.concept-card,.plate-card,.small-card{padding:18px;height:100%}
.plate-card{padding:0;overflow:hidden;display:flex;flex-direction:column}
.plate-meta{padding:16px}
.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:20px}
.detail-main,.detail-side,.only-main{display:grid;gap:16px}
.content-block{padding:20px}
.content-block h2,.viewer-panel h3{margin:0 0 12px}
.viewer-panel{padding:18px;position:sticky;top:82px}
.viewer-main{width:100%;max-height:460px;object-fit:contain;background:#f6f4ee;border:1px solid var(--line);border-radius:8px;padding:10px}
.thumb-strip{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:14px}
.thumb-button{display:block;width:100%;border:none;background:transparent;padding:0;text-align:left;cursor:pointer}
.thumb-button span,.mini-plate span{display:block;padding:10px;font-size:13px;line-height:1.5}
.source-item-deep{padding:16px}
.source-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.chapter-source-intro{padding:0 0 14px;border-bottom:1px dashed var(--line);margin-bottom:14px}
.mini-plate-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.mini-plate{display:block;background:#fff;border:1px solid var(--line);border-radius:6px;overflow:hidden}
.mini-thumb img,.thumb-frame img,.plate-thumb img{aspect-ratio:1.3/1;object-fit:contain}
.answer-button,.filter-button{padding:10px 14px;border-radius:999px;border:1px solid var(--line);background:#fff;cursor:pointer}
.answer-panel{margin-top:12px;padding:14px;border-radius:6px;background:var(--accent-soft)}
.pager{display:flex;justify-content:space-between;gap:12px}
.pager a{padding:12px 14px;border:1px solid var(--line);border-radius:6px;background:#fff;flex:1}
.filter-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:16px}
.filter-button.active{background:var(--green);color:#fff;border-color:var(--green)}
.full-plate{width:100%;max-height:720px;object-fit:contain;background:#f6f4ee;border:1px solid var(--line);border-radius:6px}
.concept-expand-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;padding-left:18px}
.glossary-table{width:100%;border-collapse:collapse;background:var(--paper);border:1px solid var(--line);border-radius:8px;overflow:hidden}
.glossary-table th,.glossary-table td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.glossary-table th{background:#efe7da}
@media (max-width:1100px){
  .card-grid,.plate-showcase,.source-grid,.small-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .detail-layout,.hero,.detail-hero{grid-template-columns:1fr}
  .detail-side{position:static}
}
@media (max-width:720px){
  .topbar{padding:14px 16px;flex-direction:column;align-items:flex-start;gap:10px}
  .page{padding:18px}
  h1{font-size:30px}
  .card-grid,.plate-showcase,.source-grid,.mini-plate-grid,.concept-expand-list,.small-grid,.hero-grid,.thumb-strip{grid-template-columns:1fr}
}