:root{
  --bg:#eef8ff;
  --paper:#ffffff;
  --paper-2:#fbfdff;
  --ink:#13212c;
  --muted:#5d7382;
  --line:#d9e5ee;
  --accent:#2f8fce;
  --accent-2:#8fd2ff;
  --soft:#eef7fd;
  --soft-2:#f9fcfe;
  --shadow:0 18px 40px rgba(11,35,42,.08);
  --radius:24px;
  --content:1220px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--ink);
  font-family:"PingFang SC","Noto Sans CJK SC","Source Han Sans SC","Microsoft YaHei",sans-serif;
  line-height:1.72;
  background:
    radial-gradient(circle at 8% 12%, rgba(47,143,206,.18), transparent 24%),
    radial-gradient(circle at 92% 8%, rgba(143,210,255,.22), transparent 18%),
    linear-gradient(180deg,#eef8ff 0%,#f7fbff 100%);
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.shell{max-width:var(--content);margin:0 auto;padding:24px 20px 80px}
.topbar{
  display:flex;gap:16px;justify-content:space-between;align-items:center;
  position:sticky;top:0;z-index:10;padding:16px 0 10px;backdrop-filter:blur(12px)
}
.brand{display:flex;gap:12px;align-items:center;font-weight:800}
.brand-mark{
  width:42px;height:42px;border-radius:14px;display:grid;place-items:center;color:#fff;
  background:linear-gradient(135deg,#5ab2ea,var(--accent));box-shadow:var(--shadow)
}
.nav{display:flex;gap:10px;flex-wrap:wrap;justify-content:flex-end}
.nav a{
  padding:9px 14px;border-radius:999px;border:1px solid rgba(19,33,44,.08);
  background:rgba(255,255,255,.82);font-size:14px;color:var(--muted)
}
.hero{
  display:grid;grid-template-columns:minmax(0,1.18fr) minmax(300px,.82fr);gap:28px;
  padding:34px;border-radius:32px;border:1px solid rgba(19,33,44,.08);
  background:rgba(255,255,255,.92);box-shadow:var(--shadow)
}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;
  background:rgba(47,143,206,.10);color:#17669b;font-size:13px;font-weight:800;text-transform:uppercase;letter-spacing:.08em
}
.hero-copy h1{margin:12px 0 14px;font-size:clamp(34px,5vw,58px);line-height:1.06}
.subtitle{font-size:18px;color:var(--muted);max-width:60ch}
.chip-row,.concept-tags,.plate-tags{display:flex;gap:10px;flex-wrap:wrap}
.chip{
  display:inline-flex;align-items:center;padding:7px 12px;border-radius:999px;
  background:#eef6fb;color:#2e4959;font-size:13px
}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:18px}
.button{
  display:inline-flex;align-items:center;justify-content:center;padding:12px 18px;border-radius:999px;
  border:1px solid rgba(19,33,44,.10);background:#fff;font-weight:700;box-shadow:var(--shadow)
}
.button.primary{border:none;background:linear-gradient(135deg,#5ab2ea,var(--accent));color:#fff}
.hero-side{display:grid;gap:16px}
.cover-card,.aside-card,.callout,.grid-card,.reading-card,.concept-card,.plate-card,.glossary-card,.stats,.path-card,.question-card,.quote-card{
  background:rgba(255,255,255,.96);border:1px solid rgba(19,33,44,.08);border-radius:24px;box-shadow:var(--shadow)
}
.cover-card,.grid-card,.concept-card,.plate-card,.reading-card,.path-card,.aside-card,.callout,.question-card,.quote-card,.glossary-card{padding:18px}
.cover-card img{
  width:100%;aspect-ratio:4/5;object-fit:contain;background:#f6fbff;padding:16px;border-radius:18px
}
.visual-strip{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:16px}
.visual-card{padding:12px;border-radius:18px;background:#f7fbff;border:1px solid rgba(19,33,44,.06)}
.visual-card img{
  width:100%;aspect-ratio:4/3;object-fit:contain;background:#fffef8;padding:10px;border-radius:14px
}
.stats{margin-top:22px;padding:18px;display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px}
.stat strong{display:block;font-size:26px}
.section{margin-top:28px}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:18px;margin-bottom:16px}
.section-head h2{margin:0;font-size:30px}
.section-head p{margin:0;color:var(--muted);max-width:62ch}
.grid{display:grid;gap:18px}
.grid.cols-3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid.cols-4{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.grid-card h3,.concept-card h3,.plate-card h3,.reading-card h3,.path-card h3{margin:8px 0 10px;font-size:22px}
.kicker{font-size:12px;text-transform:uppercase;letter-spacing:.09em;color:#17669b;font-weight:800}
.thumb{
  width:100%;aspect-ratio:4/3;border-radius:18px;background:linear-gradient(180deg,#f8fbfe,#eff6fb);
  padding:12px;display:grid;place-items:center;overflow:hidden;border:1px solid rgba(19,33,44,.06)
}
.thumb img{width:100%;height:100%;object-fit:contain}
.page-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:24px;margin-top:24px}
.page-main{display:grid;gap:20px}
.page-side{display:grid;gap:18px;align-content:start}
.bullets{margin:0;padding-left:18px}
.bullets li{margin:8px 0}
.route-list{display:grid;gap:12px}
.route-link{
  display:flex;justify-content:space-between;gap:14px;padding:14px 16px;border-radius:18px;
  background:#f2f9fe;border:1px solid rgba(47,143,206,.10)
}
.two-col{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.question-card details{cursor:pointer}
.question-card summary{font-weight:800;font-size:18px}
.question-card .answer{margin-top:12px;color:#304351}
.plate-viewer{display:grid;gap:12px}
.plate-mini{
  display:grid;grid-template-columns:90px minmax(0,1fr);gap:12px;align-items:center;padding:10px;
  border-radius:18px;background:#f7fbff;border:1px solid rgba(19,33,44,.06)
}
.plate-mini .mini-thumb{
  width:90px;height:72px;border-radius:12px;background:#fffef8;padding:8px;display:grid;place-items:center
}
.plate-mini .mini-thumb img{width:100%;height:100%;object-fit:contain}
.plate-figure{
  padding:18px;background:#f8fcff;border-radius:24px;border:1px solid rgba(19,33,44,.08)
}
.plate-figure img{width:100%;max-height:76vh;object-fit:contain;background:#fffef8;padding:16px;border-radius:18px}
.plate-breakdown{display:grid;gap:12px}
.glossary-list{display:grid;gap:14px}
.glossary-card strong{font-size:22px}
.glossary-card em{font-style:normal;color:#17669b;font-weight:700}
.footer{margin-top:42px;padding-top:24px;border-top:1px solid rgba(19,33,44,.10);color:var(--muted);font-size:14px}
.search-wrap{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
.search{
  width:min(440px,100%);padding:13px 16px;border-radius:14px;border:1px solid rgba(19,33,44,.12);background:#fff;font:inherit
}
.hidden{display:none !important}
.paper-note{
  margin-top:18px;padding:16px 18px;border-radius:20px;background:linear-gradient(180deg,#fffef8,#f5fbff);
  border:1px solid rgba(19,33,44,.06)
}
@media (max-width:960px){
  .hero,.page-grid{grid-template-columns:1fr}
  .nav{justify-content:flex-start}
  .topbar{position:static}
  .visual-strip{grid-template-columns:repeat(2,minmax(0,1fr))}
}