:root{
  --bg:#f4f1ea;
  --paper:#fcfbf8;
  --ink:#1b1b1b;
  --muted:#655f54;
  --line:#d8cfbf;
  --accent:#8d5b1f;
  --accent-2:#184d72;
  --shadow:0 20px 40px rgba(27,27,27,.08);
  --radius:22px;
  --serif:"Iowan Old Style","Songti SC","Noto Serif SC",serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"PingFang SC","Microsoft YaHei",sans-serif;background:linear-gradient(180deg,#fbf7ef,#f1ebdf);color:var(--ink);line-height:1.72}
a{color:inherit}
img{max-width:100%;display:block}
.shell{width:min(1180px,calc(100vw - 32px));margin:0 auto;padding:24px 0 56px}
.nav{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:24px}
.brand{font-size:28px;font-weight:800;line-height:1.2}
.crumbs,.meta{color:var(--muted);font-size:13px}
.crumbs a{text-decoration:none;margin-right:10px}
.nav-links{display:flex;flex-wrap:wrap;gap:10px;justify-content:flex-end}
.nav-links a,.button{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,.76);text-decoration:none;font-weight:700}
.hero,.layout,.grid,.stats,.glossary-list{display:grid;gap:18px}
.hero{grid-template-columns:1.25fr .95fr}
.layout{grid-template-columns:minmax(0,2fr) minmax(300px,1fr)}
.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))}
.stats{grid-template-columns:repeat(4,minmax(0,1fr))}
.glossary-list{grid-template-columns:repeat(2,minmax(0,1fr))}
.hero,.card,.side-card,.plate-card,.glossary-card,.path-card,.question-card,.stat-card,.callout,.viewer{background:var(--paper);border:1px solid rgba(216,207,191,.95);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero,.card,.side-card,.glossary-card,.question-card,.viewer,.callout{padding:22px}
.plate-card,.stat-card,.path-card{padding:18px}
.section{margin-top:22px}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin:18px 0 12px}
.kicker{color:var(--accent);font-weight:800;font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.page-title,h1,h2,h3{margin:0 0 10px}
.page-title,h1,h2{font-family:var(--serif)}
.page-title{font-size:clamp(26px,4vw,44px);line-height:1.14}
.subtitle{font-size:16px;color:var(--muted);max-width:64ch}
.list{margin:0;padding-left:20px}
.list li+li{margin-top:8px}
.quote{font-family:var(--serif);font-size:26px;line-height:1.45}
.cover{aspect-ratio:4/5;border-radius:18px;overflow:hidden;background:#f3ead8;border:1px solid var(--line)}
.cover img{width:100%;height:100%;object-fit:contain;padding:14px}
.thumb{aspect-ratio:1.1/1;background:#f5f0e4;border:1px solid var(--line);border-radius:18px;overflow:hidden}
.thumb img{width:100%;height:100%;object-fit:contain;padding:10px}
.stack{display:grid;gap:16px}
.chapter-card,.concept-card,.plate-card,.glossary-card,.path-card{display:block;text-decoration:none}
.chapter-card h3,.concept-card h3,.plate-card h3{font-size:20px}
.chapter-card:hover,.concept-card:hover,.plate-card:hover,.path-card:hover{transform:translateY(-2px)}
.chapter-card,.concept-card,.plate-card,.path-card{transition:transform .15s ease}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{display:inline-flex;align-items:center;min-height:30px;padding:0 10px;border-radius:999px;background:#efe4cf;color:#7a4c12;font-size:12px;font-weight:800;text-decoration:none}
.search{width:100%;min-height:44px;border-radius:14px;border:1px solid var(--line);padding:0 14px;font:inherit;background:#fff}
.viewer-main{aspect-ratio:4/3;background:#f5f0e4;border:1px solid var(--line);border-radius:18px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.viewer-main img,.plate-full{width:100%;height:100%;object-fit:contain;padding:14px}
.thumbs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.thumbs button{padding:0;border:0;background:none;cursor:pointer}
.deep-grid{display:grid;gap:12px}
.source-item-deep{padding:16px;border-radius:18px;background:#f8f4eb;border:1px solid var(--line)}
.question-answer{display:none;margin-top:12px;padding:14px;border-radius:16px;background:#efe9dc}
.question-answer.is-open{display:block}
.page-footer{display:flex;justify-content:space-between;gap:16px;margin-top:20px}
.page-footer a,.page-footer span{flex:1;min-height:78px;padding:16px;border-radius:18px;border:1px solid var(--line);background:var(--paper);text-decoration:none}
.hidden{display:none!important}
@media (max-width:980px){
  .hero,.layout,.stats,.glossary-list,.grid.cols-4,.grid.cols-3,.grid.cols-2{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  .shell{width:min(100vw - 20px,1180px)}
  .nav{flex-direction:column}
  .nav-links{justify-content:flex-start}
  .hero,.layout,.stats,.glossary-list,.grid.cols-4,.grid.cols-3,.grid.cols-2{grid-template-columns:1fr}
  .thumbs{grid-template-columns:repeat(2,minmax(0,1fr))}
}