:root {
  --bg: #eef2eb;
  --paper: #fffdf7;
  --ink: #203127;
  --muted: #5b6b62;
  --line: #cfdbcf;
  --accent: #2f684f;
  --accent-soft: #dfe9e2;
  --gold: #9d6b2f;
  --shadow: 0 16px 40px rgba(24, 42, 28, 0.08);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(157,107,47,0.14), transparent 28%),
    linear-gradient(180deg, #f7f6ef 0%, var(--bg) 100%);
  color: var(--ink);
  font-family: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", sans-serif;
}
a { color: inherit; text-decoration: none; }
.site-shell { max-width: 1360px; margin: 0 auto; padding: 0 20px 48px; }
.site-top {
  display: flex; justify-content: space-between; align-items: center;
  padding: 22px 0 16px; position: sticky; top: 0; z-index: 10;
  background: rgba(247, 246, 239, 0.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(207, 219, 207, 0.75);
}
.brand {
  font-family: "Source Han Serif SC", "Noto Serif SC", "Songti SC", serif;
  font-size: 1.2rem; font-weight: 700; letter-spacing: 0.04em;
}
.top-nav { display: flex; gap: 18px; color: var(--muted); font-size: 0.95rem; }
.page { padding-top: 18px; }
.path-panel {
  display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 10px 14px; background: rgba(255,255,255,0.62); border: 1px solid var(--line);
  border-radius: 999px; font-size: 0.92rem; color: var(--muted);
}
.hero {
  margin-top: 22px; padding: 34px; border-radius: 28px; background: rgba(255, 253, 247, 0.92);
  border: 1px solid var(--line); box-shadow: var(--shadow);
  display: grid; grid-template-columns: 1.5fr 0.8fr; gap: 28px;
}
.eyebrow {
  display: inline-block; padding: 6px 10px; border-radius: 999px; background: var(--accent-soft);
  color: var(--accent); font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase;
}
.hero h1, .section-heading h1, .section-heading h2, .detail-copy h1 {
  font-family: "Source Han Serif SC", "Noto Serif SC", "Songti SC", serif;
  margin: 14px 0 12px; line-height: 1.15;
}
.hero-summary, .thesis { font-size: 1.08rem; line-height: 1.8; color: #294234; }
.hero-stats {
  margin-top: 28px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px;
}
.hero-stats div, .hero-note, .panel, .side-card {
  background: rgba(255,255,255,0.74); border: 1px solid var(--line); border-radius: 22px;
  box-shadow: var(--shadow);
}
.hero-stats div { padding: 18px; }
.hero-stats strong { display: block; font-size: 1.8rem; font-family: "Source Han Serif SC", serif; }
.hero-stats span { color: var(--muted); }
.hero-note { padding: 20px; }
.hero-note ul, .panel ul, .panel ol { padding-left: 1.2rem; line-height: 1.8; }
.section { margin-top: 34px; }
.section-heading { display: flex; flex-direction: column; gap: 6px; margin-bottom: 18px; }
.section-heading.split { flex-direction: row; justify-content: space-between; align-items: end; gap: 18px; }
.section-heading p { color: var(--muted); line-height: 1.7; margin: 0; }
.route-grid, .chapter-grid, .concept-grid, .plate-grid {
  display: grid; gap: 18px;
}
.route-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.route-step, .card, .plate-card {
  background: rgba(255,255,255,0.86); border: 1px solid var(--line); border-radius: 24px;
  padding: 22px; box-shadow: var(--shadow);
}
.route-step p, .card p, .plate-meta p { color: var(--muted); line-height: 1.7; margin: 0; }
.chapter-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.concept-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card-kicker, .plate-meta span { color: var(--gold); font-size: 0.85rem; }
.card h3, .plate-meta h3 { margin: 10px 0 10px; font-size: 1.16rem; }
.search-wrap input {
  width: min(360px, 72vw); padding: 14px 16px; border-radius: 14px;
  border: 1px solid var(--line); background: rgba(255,255,255,0.95); font-size: 1rem;
}
.plate-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.plate-card { display: grid; grid-template-columns: 180px 1fr; gap: 18px; align-items: center; }
.plate-thumb-shell {
  aspect-ratio: 4 / 3; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(180deg, #faf8f2 0%, #eff3ec 100%);
  border: 1px solid var(--line); border-radius: 18px; padding: 12px;
}
.plate-thumb {
  width: 100%; height: 100%; object-fit: contain; background: #fbfaf6; border-radius: 12px;
}
.detail-hero {
  margin-top: 22px; display: grid; grid-template-columns: 1.3fr 0.8fr; gap: 20px;
}
.detail-copy, .detail-side { background: transparent; }
.detail-grid {
  margin-top: 24px; display: grid; grid-template-columns: minmax(0, 1.6fr) 320px; gap: 22px;
}
.main-column, .rail-column { display: flex; flex-direction: column; gap: 18px; }
.panel, .side-card { padding: 22px; }
.panel h2, .side-card h2 { margin: 0 0 14px; font-size: 1.08rem; }
.panel p, .side-card p, .panel li { line-height: 1.8; color: var(--muted); }
.deep-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.deep-card {
  border: 1px solid var(--line); background: linear-gradient(180deg, #fffef9 0%, #f3f6f1 100%);
  border-radius: 18px; padding: 18px;
}
.deep-card h3 { margin-top: 0; }
.mini-plate-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.mini-plate {
  display: grid; grid-template-columns: 88px 1fr; gap: 12px; align-items: center;
  border: 1px solid var(--line); border-radius: 16px; padding: 10px; background: rgba(255,255,255,0.76);
}
.mini-plate span { font-size: 0.95rem; line-height: 1.5; }
.learning-path { display: flex; gap: 14px; flex-wrap: wrap; }
.learning-path a {
  padding: 12px 16px; border-radius: 999px; border: 1px solid var(--line);
  background: rgba(255,255,255,0.84); color: var(--accent);
}
.plate-reader {
  display: flex; align-items: center; justify-content: center; padding: 18px;
  border-radius: 24px; background: linear-gradient(180deg, #faf8f2 0%, #eef3ed 100%);
  border: 1px solid var(--line);
}
.plate-full { max-width: 100%; max-height: 72vh; object-fit: contain; border-radius: 14px; }
.related-concepts { list-style: none; padding-left: 0; display: grid; gap: 12px; }
.related-concepts li {
  padding: 14px 16px; border-radius: 16px; background: rgba(255,255,255,0.8); border: 1px solid var(--line);
}
.related-concepts span { display: block; color: var(--muted); margin-top: 6px; }
.glossary-table {
  overflow: auto; background: rgba(255,255,255,0.86); border-radius: 22px;
  border: 1px solid var(--line); box-shadow: var(--shadow);
}
table { width: 100%; border-collapse: collapse; }
th, td { padding: 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: rgba(47,104,79,0.08); }
.is-hidden { display: none !important; }
@media (max-width: 980px) {
  .hero, .detail-hero, .detail-grid, .route-grid, .chapter-grid, .concept-grid, .plate-grid {
    grid-template-columns: 1fr;
  }
  .plate-card, .mini-plate { grid-template-columns: 1fr; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .section-heading.split { flex-direction: column; align-items: stretch; }
}