:root{
  --bg:#f4efe6;
  --paper:#fffdfa;
  --ink:#1f2430;
  --muted:#616977;
  --line:#d8cec0;
  --accent:#8f4922;
  --accent-2:#2d5e63;
  --shadow:0 18px 40px rgba(31,36,48,.08);
  --radius:20px;
  --serif:"Iowan Old Style","Songti SC","Noto Serif SC",serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:linear-gradient(180deg,#f8f4ed,#f1eadf);color:var(--ink);font:16px/1.72 "PingFang SC","Microsoft YaHei",sans-serif}
a{color:inherit}
img{display:block;max-width:100%}
.shell{width:min(1180px,calc(100vw - 28px));margin:0 auto;padding:18px 0 56px}
.top-nav{display:flex;justify-content:space-between;align-items:flex-start;gap:14px;flex-wrap:wrap;margin-bottom:20px}
.brand{font:800 28px/1.1 var(--serif);text-decoration:none}
.nav-links{display:flex;gap:10px;flex-wrap:wrap}
.pill{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 14px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.72);text-decoration:none;font-weight:700}
.pill.active{background:#ede0d2;color:var(--accent)}
.hero,.card,.plate-card,.stat,.viewer,.glossary-item,.chapter-card,.concept-card,.path-card{background:var(--paper);border:1px solid rgba(216,206,192,.92);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero,.card,.viewer,.glossary-item{padding:22px}
.plate-card,.stat,.chapter-card,.concept-card,.path-card{padding:18px}
.hero{display:grid;grid-template-columns:1.2fr .92fr;gap:18px}
.layout{display:grid;grid-template-columns:minmax(0,2fr) minmax(300px,1fr);gap:18px}
.grid{display:grid;gap:16px}
.grid.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid.cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.section{margin-top:22px}
.kicker{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);font-weight:800}
h1,h2,h3{margin:0 0 10px;font-family:var(--serif)}
h1{font-size:clamp(30px,4.2vw,50px);line-height:1.1}
h2{font-size:28px;line-height:1.18}
h3{font-size:21px;line-height:1.25}
p{margin:0}
p + p{margin-top:12px}
.muted{color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.chip{display:inline-flex;align-items:center;min-height:28px;padding:0 10px;border-radius:999px;background:#f0e4d6;color:var(--accent);font-size:12px;font-weight:800}
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.stat strong{display:block;font-size:28px;font-family:var(--serif)}
.cover{aspect-ratio:4/5;border-radius:18px;overflow:hidden;background:#f6efe4;border:1px solid var(--line)}
.cover img,.thumb img,.viewer-main img{width:100%;height:100%;object-fit:contain;padding:12px}
.thumb{aspect-ratio:1.08/1;background:#f6efe4;border:1px solid var(--line);border-radius:16px;overflow:hidden}
.viewer-main{aspect-ratio:4/3;border:1px solid var(--line);border-radius:18px;background:#f6efe4;overflow:hidden}
.viewer-thumbs{margin-top:12px;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.viewer-thumbs a{text-decoration:none}
.chapter-card,.concept-card,.path-card,.plate-card{display:block;text-decoration:none;transition:transform .15s ease}
.chapter-card:hover,.concept-card:hover,.path-card:hover,.plate-card:hover{transform:translateY(-2px)}
.chapter-meta{display:flex;flex-wrap:wrap;gap:10px;color:var(--muted);font-size:13px;margin:10px 0 12px}
.chapter-text{display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}
.list{margin:0;padding-left:20px}
.list li+li{margin-top:8px}
.search{width:100%;min-height:44px;border-radius:14px;border:1px solid var(--line);padding:0 14px;background:#fff;font:inherit}
.glossary-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.footer{margin-top:28px;color:var(--muted);font-size:13px}
blockquote{margin:14px 0 0;padding:14px 16px;border-left:4px solid #d9b08d;background:#faf5ee;border-radius:0 14px 14px 0;color:#534a42}
@media (max-width:900px){
  .hero,.layout,.grid.cols-2,.grid.cols-3,.grid.cols-4,.glossary-grid,.stats{grid-template-columns:1fr}
  .viewer-thumbs{grid-template-columns:repeat(3,minmax(0,1fr))}
}