:root{
  --bg:#f4efe6;
  --paper:#fffaf3;
  --paper-strong:#fff5e7;
  --ink:#1f2421;
  --muted:#6e6a61;
  --line:#d6c8b4;
  --accent:#2d675f;
  --accent-soft:#dcebe4;
  --brick:#996547;
  --shadow:0 18px 50px rgba(41,31,18,.08);
  --radius:24px;
  --display:"Songti SC","STSong","Noto Serif CJK SC",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Noto Sans CJK SC",sans-serif;
}
*{box-sizing:border-box}
body{
  margin:0;
  background:
    radial-gradient(circle at top left, rgba(45,103,95,.1), transparent 32%),
    linear-gradient(180deg, #f9f4ec 0%, var(--bg) 100%);
  color:var(--ink);
  font-family:var(--sans);
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.site-header{
  position:sticky;top:0;z-index:20;
  backdrop-filter:blur(12px);
  background:rgba(249,244,236,.84);
  border-bottom:1px solid rgba(214,200,180,.7);
}
.header-wrap{
  width:min(1180px, calc(100vw - 32px));
  margin:0 auto;
  min-height:78px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
}
.brand{display:flex;align-items:center;gap:14px}
.brand-mark{
  width:46px;height:46px;border-radius:16px;
  display:grid;place-items:center;
  background:linear-gradient(135deg, var(--accent), #184742);
  color:#fff;font-family:var(--display);font-size:24px;
  box-shadow:var(--shadow);
}
.brand-copy{display:grid;gap:4px}
.brand-copy strong{font-size:17px}
.brand-copy em{font-style:normal;color:var(--muted);font-size:12px}
.site-nav{display:flex;flex-wrap:wrap;gap:10px}
.nav-link{
  padding:10px 14px;border-radius:999px;
  color:var(--muted);font-weight:600;font-size:14px;
}
.nav-link.is-active,.nav-link:hover{background:var(--paper);color:var(--accent)}
.page-shell{
  width:min(1180px, calc(100vw - 32px));
  margin:0 auto;
  padding:26px 0 56px;
}
.hero-panel,.chapter-hero,.plate-hero{
  display:grid;grid-template-columns:1.35fr .9fr;gap:22px;
  align-items:stretch;
}
.hero-copy,.hero-side,.chapter-main,.chapter-aside,.plate-visual,.plate-copy,
.lane-card,.chapter-card,.concept-card,.plate-card,.glossary-card,.fact-card,.deep-card,
.quote-box,.thesis-box,.mini-card,.plate-mini,.path-line,.section-block{
  background:rgba(255,250,243,.92);
  border:1px solid rgba(214,200,180,.85);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.hero-copy,.chapter-main,.plate-copy{padding:30px}
.hero-side,.chapter-aside{padding:22px}
.quote-box{height:100%;padding:24px;background:linear-gradient(160deg,#f1f7f3,#fff7eb)}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  color:var(--accent);text-transform:uppercase;letter-spacing:.08em;
  font-size:12px;font-weight:700;
}
h1,h2,h3{font-family:var(--display);margin:0 0 12px}
h1{font-size:clamp(34px,4.8vw,54px);line-height:1.08}
h2{font-size:28px;line-height:1.18}
h3{font-size:22px;line-height:1.22}
.lead,.page-subtitle{font-size:18px;line-height:1.8;color:#2d332f}
.page-subtitle{margin:8px 0 18px}
.soft-note{color:var(--muted);line-height:1.8}
.chip-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.chip{
  display:inline-flex;align-items:center;min-height:34px;padding:0 14px;
  border-radius:999px;background:var(--paper-strong);border:1px solid var(--line);
  color:var(--brick);font-size:13px;font-weight:700;
}
.panel-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-top:22px}
.lane-card,.fact-card,.deep-card,.glossary-card{padding:22px}
.section-block{padding:24px;margin-top:24px}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:20px}
.section-head p{max-width:680px;color:var(--muted);line-height:1.8;margin:0}
.chapter-grid,.concept-grid,.glossary-grid,.plate-list,.deep-grid,.mini-card-grid,.plate-mini-grid,.principle-grid,.dual-block,.plate-panel-grid{
  display:grid;gap:16px;
}
.chapter-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.concept-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.glossary-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
.plate-list{grid-template-columns:repeat(4,minmax(0,1fr))}
.deep-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.mini-card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.plate-mini-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
.principle-grid,.dual-block,.plate-panel-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.chapter-card,.concept-card{padding:22px;display:grid;gap:10px}
.chapter-card h3,.concept-card h3,.glossary-card h3{margin-bottom:0}
.chapter-card p,.concept-card p,.glossary-card p,.mini-card span,.plate-card span,.plate-mini span,.fact-card p,.deep-card p,.quote-box p{line-height:1.8;color:#323734;margin:0}
.card-image{
  aspect-ratio:4 / 3;background:#f7f0e2;border-bottom:1px solid var(--line);
  padding:14px;display:grid;place-items:center;border-radius:22px 22px 0 0;
}
.card-image img,.plate-mini img{
  width:100%;height:100%;object-fit:contain;background:#fffaf4;border-radius:14px;
}
.plate-card{overflow:hidden;display:grid}
.card-copy{padding:16px;display:grid;gap:6px}
.path-line{
  display:flex;align-items:center;gap:10px;
  padding:14px 18px;margin-bottom:18px;color:var(--muted);font-size:14px;
}
.thesis-box{margin-top:20px;padding:20px;background:linear-gradient(180deg,#fff9ee,#f1f7f3)}
.fact-card ul,.deep-card ul{padding-left:18px;margin:0}
.fact-card li,.deep-card li{margin:8px 0;line-height:1.75}
.more-row,.pager{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-top:20px}
.primary-link{
  display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 18px;
  border-radius:999px;background:var(--accent);color:#fff;font-weight:700;
}
.mini-card{padding:18px;display:grid;gap:8px}
.plate-mini{
  display:grid;gap:10px;padding:12px;border-radius:20px;background:var(--paper-strong);
  border:1px solid var(--line);
}
.plate-mini img{aspect-ratio:4 / 3;padding:10px}
.plate-group + .plate-group{margin-top:18px}
.plate-group h3{margin-bottom:12px}
.thumb-frame{
  background:#f7f0e0;padding:22px;display:grid;place-items:center;
}
.thumb-frame img{
  max-height:72vh;object-fit:contain;background:#fffdf8;border-radius:18px;
  box-shadow:0 12px 32px rgba(0,0,0,.08);
}
.pager a{
  min-height:44px;display:inline-flex;align-items:center;padding:0 16px;
  border-radius:999px;background:var(--paper);border:1px solid var(--line);font-weight:700;
}
details summary{cursor:pointer;font-weight:700;color:var(--accent);margin-bottom:10px}
@media (max-width:1000px){
  .hero-panel,.chapter-hero,.plate-hero,.panel-grid,.principle-grid,.dual-block,.plate-panel-grid{grid-template-columns:1fr}
  .chapter-grid,.concept-grid,.glossary-grid,.plate-list,.deep-grid,.mini-card-grid,.plate-mini-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  .header-wrap{padding:10px 0;align-items:flex-start;flex-direction:column}
  .page-shell{padding-top:18px}
  .chapter-grid,.concept-grid,.glossary-grid,.plate-list,.deep-grid,.mini-card-grid,.plate-mini-grid{grid-template-columns:1fr}
  h1{font-size:34px}
  h2{font-size:24px}
  .hero-copy,.chapter-main,.plate-copy,.section-block{padding:20px}
  .hero-side,.chapter-aside,.lane-card,.fact-card,.deep-card,.glossary-card,.quote-box{padding:18px}
  .section-head{align-items:flex-start;flex-direction:column}
}