:root {
  --bg: #f3eadb;
  --bg-soft: #fbf6ec;
  --paper: #fffdfa;
  --ink: #2b241d;
  --muted: #6d5f51;
  --line: #d9c7b0;
  --line-strong: #b79b7a;
  --accent: #b85c38;
  --accent-deep: #7b341e;
  --accent-soft: #efd8bf;
  --moss: #6d7d4f;
  --sun: #f3c978;
  --shadow: 0 18px 40px rgba(84, 56, 28, 0.12);
  --radius-lg: 26px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --content-width: 1180px;
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  background:
    radial-gradient(circle at top left, rgba(243, 201, 120, 0.33), transparent 30%),
    radial-gradient(circle at top right, rgba(184, 92, 56, 0.12), transparent 22%),
    linear-gradient(180deg, #f6eedf 0%, #f2e6d6 48%, #f7f1e7 100%);
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.page-shell {
  min-height: 100vh;
  padding: 24px 20px 72px;
}

.site-header {
  max-width: var(--content-width);
  margin: 0 auto 20px;
  padding: 16px 20px;
  border: 1px solid rgba(185, 157, 120, 0.45);
  border-radius: 999px;
  background: rgba(255, 250, 242, 0.72);
  backdrop-filter: blur(14px);
  box-shadow: 0 10px 30px rgba(101, 68, 34, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  position: sticky;
  top: 14px;
  z-index: 10;
}

.brand-mark {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.brand-mark strong {
  font-family: var(--serif);
  font-size: 1.02rem;
  letter-spacing: 0.02em;
}

.brand-mark span {
  color: var(--muted);
  font-size: 0.83rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.site-nav a {
  padding: 9px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-nav a.active,
.site-nav a:hover {
  background: var(--accent);
  color: #fff;
}

.container {
  max-width: var(--content-width);
  margin: 0 auto;
}

.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(255, 251, 246, 0.97), rgba(248, 236, 216, 0.95));
  border: 1px solid rgba(183, 155, 122, 0.42);
  border-radius: 34px;
  padding: 38px 34px;
  box-shadow: var(--shadow);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -80px -80px auto;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(184, 92, 56, 0.18), transparent 68%);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: rgba(239, 216, 191, 0.72);
  border-radius: 999px;
  color: var(--accent-deep);
  font-size: 0.85rem;
  letter-spacing: 0.03em;
}

.hero h1,
.page-title {
  margin: 16px 0 12px;
  font-family: var(--serif);
  font-size: clamp(2.3rem, 5vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: 0.01em;
}

.hero-copy {
  max-width: 760px;
  color: var(--muted);
  font-size: 1.06rem;
  line-height: 1.9;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(280px, 0.9fr);
  gap: 28px;
  align-items: end;
}

.hero-panel,
.card,
.side-panel,
.section-panel {
  background: rgba(255, 253, 249, 0.92);
  border: 1px solid rgba(183, 155, 122, 0.38);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 28px rgba(88, 62, 33, 0.08);
}

.hero-panel {
  padding: 22px;
}

.chips {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 18px;
}

.chip {
  padding: 10px 13px;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid rgba(183, 155, 122, 0.42);
  color: var(--accent-deep);
  font-size: 0.9rem;
}

.hero-quote {
  margin: 0;
  padding: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.1rem;
  line-height: 1.9;
}

.hero-quote footer {
  margin-top: 18px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.9rem;
}

.section {
  margin-top: 28px;
}

.section-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.section-header h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
}

.section-header p {
  margin: 0;
  max-width: 760px;
  color: var(--muted);
  line-height: 1.75;
}

.grid {
  display: grid;
  gap: 18px;
}

.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  padding: 22px;
}

.card h3,
.card h4 {
  margin: 10px 0 10px;
  font-family: var(--serif);
  line-height: 1.35;
}

.card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.badge {
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(239, 216, 191, 0.72);
  color: var(--accent-deep);
  font-size: 0.78rem;
  border: 1px solid rgba(184, 92, 56, 0.16);
}

.route-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  color: var(--moss);
  font-size: 0.88rem;
}

.search-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 20px;
  border: 1px solid rgba(183, 155, 122, 0.42);
  background: rgba(255, 252, 247, 0.9);
}

.search-bar input {
  width: 100%;
  border: 0;
  outline: none;
  background: transparent;
  font: inherit;
  color: var(--ink);
}

.act-section {
  padding: 24px;
  border-radius: 28px;
  background: rgba(255, 250, 243, 0.82);
  border: 1px solid rgba(183, 155, 122, 0.38);
}

.chapter-list,
.concept-list,
.plate-list {
  display: grid;
  gap: 16px;
}

.chapter-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.concept-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.plate-list { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.chapter-card,
.concept-card,
.plate-card {
  display: block;
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.chapter-card:hover,
.concept-card:hover,
.plate-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 34px rgba(92, 62, 30, 0.12);
}

.thumb-frame {
  background: linear-gradient(180deg, #fffaf1, #f1e4d3);
  border-radius: 22px;
  padding: 14px;
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border: 1px solid rgba(183, 155, 122, 0.28);
}

.thumb-frame img {
  max-height: 100%;
  object-fit: contain;
  border-radius: 12px;
}

.card-copy {
  padding-top: 16px;
}

.card-copy p {
  margin-top: 10px;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) 340px;
  gap: 22px;
  align-items: start;
}

.main-column,
.side-column {
  display: grid;
  gap: 18px;
}

.section-panel {
  padding: 24px;
}

.path-panel {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.path-panel a {
  color: var(--accent-deep);
}

.page-title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  margin: 8px 0 10px;
}

.lede {
  color: var(--muted);
  line-height: 1.85;
  font-size: 1.04rem;
}

.thesis-box {
  padding: 18px 20px;
  border-radius: 22px;
  background: linear-gradient(135deg, rgba(255, 248, 240, 0.95), rgba(239, 216, 191, 0.58));
  border: 1px solid rgba(184, 92, 56, 0.16);
}

.thesis-box strong {
  display: block;
  margin-bottom: 8px;
  color: var(--accent-deep);
}

.dense-list,
.mini-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 18px;
  color: var(--ink);
  line-height: 1.8;
}

.mini-list {
  gap: 8px;
  padding-left: 16px;
}

.quote-card {
  padding: 18px;
  border-radius: 20px;
  background: rgba(250, 242, 231, 0.74);
  border: 1px solid rgba(183, 155, 122, 0.34);
}

.quote-card h4 { margin-top: 0; }

.route-group {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 253, 249, 0.82);
  border: 1px solid rgba(183, 155, 122, 0.3);
}

.route-group + .route-group {
  margin-top: 12px;
}

.route-group h4 {
  margin: 0 0 10px;
}

.side-panel {
  padding: 20px;
}

.side-panel h3,
.section-panel h2,
.section-panel h3 {
  margin-top: 0;
}

.aside-stack {
  display: grid;
  gap: 14px;
}

.aside-card {
  padding: 16px;
  border-radius: 18px;
  background: rgba(255, 251, 245, 0.92);
  border: 1px solid rgba(183, 155, 122, 0.34);
}

.aside-card h4 {
  margin: 0 0 8px;
  font-family: var(--serif);
}

.thumb-strip {
  display: grid;
  gap: 12px;
}

.thumb-strip .thumb-frame {
  aspect-ratio: 4 / 2.8;
  padding: 10px;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.pager a {
  flex: 1 1 240px;
  padding: 16px 18px;
  border-radius: 22px;
  background: rgba(255, 251, 245, 0.9);
  border: 1px solid rgba(183, 155, 122, 0.36);
}

.pager span {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
}

.pager strong {
  display: block;
  margin-top: 6px;
  line-height: 1.5;
}

.qa details {
  border-radius: 18px;
  background: rgba(255, 251, 245, 0.88);
  border: 1px solid rgba(183, 155, 122, 0.34);
  padding: 16px 18px;
}

.qa summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent-deep);
}

.qa p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.8;
}

.glossary-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.term-card {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 253, 248, 0.9);
  border: 1px solid rgba(183, 155, 122, 0.36);
}

.term-card strong {
  display: block;
  margin-bottom: 6px;
}

.term-card span {
  color: var(--accent-deep);
  font-size: 0.88rem;
}

.footer-note {
  margin-top: 26px;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.75;
}

[data-hidden="true"] {
  display: none !important;
}

@media (max-width: 960px) {
  .site-header {
    border-radius: 26px;
    padding: 16px;
    align-items: flex-start;
    flex-direction: column;
  }

  .hero-grid,
  .page-layout {
    grid-template-columns: 1fr;
  }

  .grid.cols-4,
  .grid.cols-3,
  .plate-list,
  .chapter-list,
  .concept-list,
  .glossary-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .page-shell {
    padding: 14px 12px 44px;
  }

  .hero,
  .card,
  .section-panel,
  .side-panel,
  .act-section {
    border-radius: 24px;
    padding: 18px;
  }

  .hero h1,
  .page-title {
    font-size: 2.1rem;
  }

  .grid.cols-2,
  .grid.cols-3,
  .grid.cols-4,
  .plate-list,
  .chapter-list,
  .concept-list,
  .glossary-grid {
    grid-template-columns: 1fr;
  }

  .site-nav {
    width: 100%;
  }
}