:root{
  --bg:#f4f1ea;
  --panel:#fffdf8;
  --ink:#1f2e2a;
  --muted:#63756e;
  --line:#d8d1c2;
  --accent:#2f6b6a;
  --accent-soft:#d8ece7;
  --paper:#f6f3eb;
  --shadow:0 18px 48px rgba(31,46,42,.08);
}
*{box-sizing:border-box}
body{
  margin:0;
  color:var(--ink);
  background:
    radial-gradient(circle at top left, rgba(47,107,106,.08), transparent 28%),
    radial-gradient(circle at 85% 18%, rgba(199,167,93,.12), transparent 26%),
    linear-gradient(180deg, #fbf8f2 0%, var(--bg) 100%);
  font:16px/1.65 "PingFang SC","Hiragino Sans GB","Noto Sans CJK SC","Source Han Sans SC",sans-serif;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.site-shell{max-width:1240px;margin:0 auto;padding:0 20px 40px}
.topbar{
  position:sticky;top:0;z-index:40;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 0;
  backdrop-filter:blur(10px);
  background:rgba(244,241,234,.78);
  border-bottom:1px solid rgba(216,209,194,.7);
}
.brand{font-size:18px;font-weight:800;letter-spacing:0}
.topnav{display:flex;flex-wrap:wrap;gap:10px}
.topnav a{
  border:1px solid var(--line);border-radius:999px;background:rgba(255,253,248,.82);
  padding:8px 12px;font-size:13px;font-weight:700;
}
.page{padding:28px 0 0}
.hero,.chapter-layout{
  display:grid;gap:24px;
  grid-template-columns:minmax(0,1.35fr) minmax(280px,.9fr);
}
.hero-copy,.hero-visual,.content-block,.card,.plate-card,.glossary-card,.reading-card,.plate-learn{
  background:var(--panel);
  border:1px solid rgba(216,209,194,.9);
  border-radius:18px;
  box-shadow:var(--shadow);
}
.hero-copy{padding:28px}
.hero-visual{padding:18px}
.hero-thumb{height:100%}
.page-head{padding:8px 0 18px}
.page-head h1,.hero h1{font-size:40px;line-height:1.12;margin:8px 0 10px}
.lead{font-size:19px;color:#304640;max-width:850px}
.eyebrow{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}
.grid-section{margin-top:28px}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin-bottom:12px}
.section-head h2,.content-block h2{margin:0 0 10px;font-size:24px;line-height:1.2}
.section-head p,.content-block p,.plate-meta span,.glossary-card p{color:var(--muted)}
.card-grid{
  display:grid;gap:16px;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
}
.card,.content-block,.glossary-card,.reading-card,.plate-learn{padding:20px}
.card h3,.plate-meta strong,.glossary-card h3,.reading-card h3,.plate-learn h3{margin:8px 0 10px;font-size:20px;line-height:1.25}
.plate-grid{
  display:grid;gap:16px;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
}
.plate-card{padding:14px;display:flex;flex-direction:column;gap:12px}
.thumb-frame{
  aspect-ratio:4/3;
  display:flex;align-items:center;justify-content:center;
  background:var(--paper);
  border:1px solid rgba(216,209,194,.9);
  border-radius:14px;padding:14px;overflow:hidden;
}
.thumb-frame img{width:100%;height:100%;object-fit:contain;object-position:center}
.plate-meta{display:flex;flex-direction:column;gap:6px}
.chapter-main{display:flex;flex-direction:column;gap:18px;min-width:0}
.chapter-media{display:flex;flex-direction:column;gap:14px;position:sticky;top:88px;height:max-content}
.viewer-main{
  background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:16px;box-shadow:var(--shadow);
}
.viewer-main img{width:100%;height:auto;max-height:540px;object-fit:contain}
.thumb-strip{display:grid;gap:10px}
.thumb-button{
  width:100%;padding:10px;border:1px solid var(--line);border-radius:14px;background:var(--panel);
  display:grid;grid-template-columns:110px 1fr;gap:12px;align-items:center;text-align:left;cursor:pointer;
}
.thumb-button span{font-size:13px;font-weight:700;color:var(--ink)}
.route-list,.glossary-list{display:grid;gap:12px;padding-left:20px}
.route-list li,.glossary-list li{color:var(--muted)}
.route-list span,.glossary-list span{display:block;margin-top:4px}
ul{padding-left:20px}
li+li{margin-top:6px}
.reading-grid,.plate-learn-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.reading-card .sample{color:#3a524d}
.qa{
  border:1px dashed rgba(47,107,106,.35);
  border-radius:14px;
  padding:14px 16px;
  background:rgba(216,236,231,.35);
}
.qa summary{cursor:pointer;font-weight:800}
.plate-full-wrap{
  border:1px solid var(--line);border-radius:18px;background:var(--paper);padding:18px;
}
.plate-full{width:100%;height:auto;object-fit:contain}
.pager{display:flex;justify-content:space-between;gap:12px}
.pager a,.text-link{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:42px;padding:0 14px;border-radius:999px;
  border:1px solid var(--line);background:rgba(255,253,248,.88);font-weight:700;
}
.glossary-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
@media (max-width:960px){
  .hero,.chapter-layout{grid-template-columns:1fr}
  .chapter-media{position:relative;top:0}
}
@media (max-width:640px){
  .site-shell{padding:0 14px 32px}
  .page-head h1,.hero h1{font-size:30px}
  .lead{font-size:17px}
  .thumb-button{grid-template-columns:92px 1fr}
}