:root{
  --bg:#f3eee6;
  --paper:#fffaf2;
  --ink:#161310;
  --muted:#6d6257;
  --line:#dbcdb7;
  --accent:#c86b1f;
  --shadow:0 18px 40px rgba(59,40,17,.08);
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Noto Serif SC","Songti SC",serif;
  color:var(--ink);
  background:
    radial-gradient(circle at top left, rgba(216,194,158,.22), transparent 28%),
    linear-gradient(180deg, #f7f3ed 0%, var(--bg) 100%);
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.shell{width:min(1180px, calc(100% - 40px));margin:0 auto}
.topbar{
  width:min(1180px, calc(100% - 40px));
  margin:20px auto 0;
  padding:14px 18px;
  border:1px solid rgba(120,94,58,.15);
  border-radius:999px;
  background:rgba(255,250,242,.86);
  backdrop-filter:blur(10px);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  position:sticky;
  top:10px;
  z-index:20;
}
.brand{font-weight:800;letter-spacing:.04em}
.topbar nav{display:flex;gap:16px;flex-wrap:wrap}
.topbar nav a{color:var(--muted);font-size:14px}
.page{padding:28px 0 72px}
.hero,.page-hero{
  background:linear-gradient(135deg, rgba(255,248,237,.96), rgba(250,241,226,.9));
  border:1px solid rgba(133,98,52,.16);
  border-radius:32px;
  box-shadow:var(--shadow);
}
.hero{
  display:grid;
  grid-template-columns:1.3fr .9fr;
  gap:28px;
  padding:34px;
  align-items:start;
}
.page-hero{padding:28px 30px;margin-bottom:26px}
.eyebrow{
  display:inline-flex;
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:#9b7b45;
  font-weight:700;
}
h1,h2,h3{margin:0 0 14px}
h1{font-size:clamp(32px,5vw,58px);line-height:1.08}
h2{font-size:28px}
h3{font-size:20px;line-height:1.35}
.lead{font-size:20px;line-height:1.7;color:#2e2720;margin:0}
.hero-note{margin:16px 0 0;color:var(--muted);line-height:1.8}
.hero-panel,.panel,.card{
  background:rgba(255,250,242,.92);
  border:1px solid rgba(130,98,60,.15);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.hero-panel,.panel{padding:20px}
.hero-panel ol{margin:14px 0 0;padding-left:18px;line-height:1.9}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:22px}
.button{
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 18px;border-radius:999px;background:var(--accent);color:#fff7ef;font-weight:700
}
.button.secondary{background:#fff1df;color:#7d4b1e}
.route{padding:28px 0 12px}
.route-grid{
  display:grid;
  gap:12px;
  grid-template-columns:repeat(auto-fit, minmax(160px,1fr));
}
.route-item{
  border:1px solid rgba(128,100,67,.14);
  background:rgba(255,250,242,.86);
  border-radius:14px;
  padding:14px 16px;
  min-height:60px;
  display:flex;
  align-items:center;
  font-weight:700;
}
.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin:34px 0 16px
}
.section-head a{color:#7d4b1e;font-weight:700}
.card-grid{
  display:grid;
  gap:18px;
  grid-template-columns:repeat(auto-fit, minmax(250px,1fr));
}
.chapter-card,.concept-card,.plate-card{
  display:flex;
  flex-direction:column;
  overflow:hidden;
}
.chapter-card img,.concept-card img,.plate-card img,.plate-card-home img,.plate-path-card img,.viewer-thumbs img{
  width:100%;
  aspect-ratio:4/3;
  object-fit:contain;
  background:#f8f1e4;
  padding:12px;
  border-bottom:1px solid rgba(120,94,58,.12);
}
.card-copy{padding:18px}
.card-copy p{margin:0 0 10px;line-height:1.75;color:#3a332c}
.card-copy small{color:var(--muted)}
.plate-band{
  display:grid;
  gap:14px;
  grid-template-columns:repeat(auto-fit, minmax(180px,1fr));
}
.plate-card-home{
  border:1px solid rgba(130,98,60,.15);
  border-radius:16px;
  overflow:hidden;
  background:rgba(255,250,242,.92);
  box-shadow:var(--shadow);
}
.plate-card-home span{display:block;padding:14px 16px;font-weight:700;line-height:1.5}
.two-col{
  display:grid;
  grid-template-columns:minmax(0,1.35fr) minmax(300px,.85fr);
  gap:22px;
}
.main-col,.side-col{display:grid;gap:18px}
.bullet-list{margin:0;padding-left:18px;line-height:1.85}
.deep-grid,.path-grid{display:grid;gap:16px}
.source-item-deep{
  border:1px solid rgba(120,94,58,.14);
  border-radius:16px;
  padding:18px;
  background:#fffdfa;
}
.source-item-deep p{margin:0 0 10px;line-height:1.8}
.source-item-deep blockquote{
  margin:0;
  padding:14px 16px;
  background:#f7efe3;
  border-left:4px solid #caa16b;
  color:#54483d;
  line-height:1.8;
}
.viewer-main,.plate-full{
  width:100%;
  object-fit:contain;
  background:#faf5ec;
  border-radius:16px;
  padding:16px;
}
.viewer-thumbs{
  display:grid;
  gap:10px;
  margin-top:14px;
}
.viewer-thumbs button{
  border:1px solid rgba(120,94,58,.14);
  border-radius:14px;
  background:#fffdf9;
  cursor:pointer;
  padding:0;
  overflow:hidden;
  text-align:left;
}
.viewer-thumbs span{display:block;padding:10px 12px;font-size:14px;line-height:1.5}
.plate-path-grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
.plate-path-card{
  border:1px solid rgba(120,94,58,.14);
  border-radius:14px;
  overflow:hidden;
  background:#fffdfa;
}
.plate-path-card strong,.plate-path-card span{display:block;padding:0 12px 12px}
.plate-path-card strong{padding-top:12px}
.plate-path-group + .plate-path-group{margin-top:18px}
.path-card{
  border:1px solid rgba(120,94,58,.14);
  border-radius:14px;
  padding:16px;
  background:#fffdf9;
}
.path-card strong,.path-card span{display:block}
.path-card span{margin-top:8px;color:var(--muted);line-height:1.7}
.path-nav{
  display:flex;
  justify-content:space-between;
  gap:14px;
  flex-wrap:wrap;
}
.path-nav a{
  color:#7d4b1e;
  font-weight:700;
}
.plate-detail-grid{
  display:grid;
  gap:18px;
  grid-template-columns:repeat(auto-fit, minmax(240px,1fr));
  margin:22px 0;
}
.mini-list{margin:0;padding-left:18px;line-height:1.9}
.search-panel{margin-bottom:18px}
.search{
  width:100%;
  border:1px solid rgba(120,94,58,.18);
  border-radius:999px;
  padding:14px 18px;
  background:#fffdf9;
  font:inherit;
}
.glossary-grid{
  display:grid;
  gap:16px;
  grid-template-columns:repeat(auto-fit, minmax(240px,1fr));
}
.glossary-item{
  border:1px solid rgba(120,94,58,.14);
  border-radius:16px;
  background:#fffdfa;
  padding:18px;
}
.glossary-item .en{margin:0 0 10px;color:#8b7257;font-style:italic}
@media (max-width: 960px){
  .hero,.two-col{grid-template-columns:1fr}
  .topbar{border-radius:24px;align-items:flex-start;flex-direction:column}
}