:root {
  --bg: #f5f1ea;
  --bg-soft: #faf7f2;
  --panel: rgba(255, 255, 255, 0.78);
  --panel-strong: rgba(255, 255, 255, 0.94);
  --ink: #171412;
  --muted: #6f675f;
  --rule: rgba(32, 27, 23, 0.1);
  --accent: #b07a3d;
  --accent-deep: #7a4b21;
  --shadow: 0 24px 60px rgba(32, 27, 23, 0.08);
  --radius: 22px;
  --radius-sm: 16px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(176, 122, 61, 0.18), transparent 36%),
    radial-gradient(circle at top right, rgba(122, 75, 33, 0.14), transparent 30%),
    linear-gradient(180deg, #fcfaf7 0%, var(--bg) 46%, #efe7da 100%);
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", system-ui, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea,
select {
  font: inherit;
}

.backdrop {
  position: fixed;
  inset: auto;
  border-radius: 999px;
  filter: blur(72px);
  pointer-events: none;
  opacity: 0.4;
  z-index: 0;
}

.backdrop-a {
  top: 6vh;
  left: -6vw;
  width: 34vw;
  height: 34vw;
  background: rgba(176, 122, 61, 0.26);
}

.backdrop-b {
  bottom: 2vh;
  right: -8vw;
  width: 28vw;
  height: 28vw;
  background: rgba(122, 75, 33, 0.18);
}

.shell {
  position: relative;
  z-index: 1;
  width: min(1480px, calc(100% - 24px));
  margin: 0 auto;
  padding: 18px 0 32px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 10px 0 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  color: #fff;
  background: linear-gradient(145deg, var(--accent), var(--accent-deep));
  box-shadow: 0 10px 28px rgba(122, 75, 33, 0.18);
  font-size: 1.1rem;
}

.brand-copy {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.brand-title {
  font-family: "Songti SC", "Noto Serif CJK SC", "STSong", serif;
  font-size: 1.3rem;
  letter-spacing: 0.02em;
}

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

.top-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.chip {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 13px;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.58);
  box-shadow: 0 8px 20px rgba(32, 27, 23, 0.04);
  color: var(--ink);
  font-size: 0.88rem;
  white-space: nowrap;
}

.chip.ghost {
  background: rgba(255, 255, 255, 0.34);
  color: var(--accent-deep);
}

.frame {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 292px;
  gap: 16px;
  align-items: start;
}

.sidebar,
.rail {
  position: sticky;
  top: 18px;
  display: grid;
  gap: 14px;
}

.sidebar-card,
.rail-card,
.page,
.card,
.hero-card {
  border: 1px solid var(--rule);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px);
}

.sidebar-card,
.rail-card {
  border-radius: var(--radius);
  padding: 18px;
}

.sidebar-card h2 {
  margin: 0 0 6px;
  font-family: "Songti SC", "Noto Serif CJK SC", "STSong", serif;
  font-size: 1.45rem;
  line-height: 1.12;
}

.sidebar-copy,
.rail-path,
.rail-notes p,
.rail-sources a {
  color: var(--muted);
  font-size: 0.93rem;
}

.tree-nav {
  padding: 4px 0 0;
}

.tree-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.tree-item {
  border-radius: 18px;
}

.tree-link {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border-radius: 18px;
  border: 1px solid transparent;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.tree-item.active > .tree-link,
.tree-item.ancestor > .tree-link,
.tree-link:hover {
  border-color: rgba(176, 122, 61, 0.22);
  background: rgba(255, 255, 255, 0.7);
  transform: translateY(-1px);
}

.tree-title {
  font-family: "Songti SC", "Noto Serif CJK SC", "STSong", serif;
  font-size: 1rem;
}

.tree-summary {
  color: var(--muted);
  font-size: 0.84rem;
}

.tree-branch {
  padding: 8px 0 0 10px;
  margin-left: 10px;
  border-left: 1px solid rgba(32, 27, 23, 0.08);
}

.content {
  min-width: 0;
  outline: none;
}

.page {
  display: grid;
  gap: 18px;
  border-radius: 30px;
  padding: 22px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.72fr);
  gap: 18px;
  align-items: start;
}

.hero-copy {
  display: grid;
  gap: 12px;
}

.eyebrow {
  margin: 0;
  color: var(--accent-deep);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Songti SC", "Noto Serif CJK SC", "STSong", serif;
  font-weight: 700;
  line-height: 1.12;
}

h1 {
  font-size: clamp(2.2rem, 4.2vw, 4.8rem);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.3rem, 2vw, 1.85rem);
}

h3 {
  font-size: 1.06rem;
}

.lead {
  max-width: 66ch;
  margin: 0;
  color: var(--ink);
  font-size: clamp(1rem, 1.22vw, 1.15rem);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-card {
  border-radius: 24px;
  padding: 18px;
}

.micro-label {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.8rem;
}

.section {
  display: grid;
  gap: 14px;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 12px;
}

.section-head h2 {
  margin-top: 4px;
}

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

.card {
  display: grid;
  gap: 8px;
  padding: 18px;
  border-radius: 22px;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(176, 122, 61, 0.22);
  background: var(--panel-strong);
}

.card-eyebrow {
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

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

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 18px;
  border-radius: 22px;
  border: 1px solid var(--rule);
  background: rgba(255, 255, 255, 0.52);
}

.timeline-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 58px;
  min-height: 42px;
  border-radius: 14px;
  background: rgba(176, 122, 61, 0.12);
  color: var(--accent-deep);
  font-size: 0.88rem;
  letter-spacing: 0.06em;
}

.timeline-item p {
  margin: 6px 0 0;
  color: var(--muted);
}

.chant-stack {
  display: grid;
  gap: 12px;
}

.chant-line {
  padding: 18px;
  border-radius: 22px;
  border: 1px solid var(--rule);
  background: rgba(255, 255, 255, 0.66);
}

.chant-zh {
  margin: 0 0 8px;
  font-size: clamp(1.05rem, 1.5vw, 1.32rem);
  line-height: 1.72;
}

.chant-py {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.quote {
  margin: 0;
  padding: 22px 22px 22px 24px;
  border-left: 4px solid rgba(176, 122, 61, 0.45);
  background: rgba(255, 255, 255, 0.5);
  border-radius: 18px;
}

.quote p {
  margin: 0;
  font-size: 1.08rem;
}

.bullet-list {
  margin: 0;
  padding-left: 20px;
  color: var(--ink);
  display: grid;
  gap: 10px;
}

.rail {
  padding-bottom: 24px;
}

.rail-card {
  display: grid;
  gap: 10px;
}

.rail-path {
  margin: 0;
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88rem;
  word-break: break-all;
}

.rail-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  color: var(--muted);
  font-size: 0.88rem;
}

.crumb-sep {
  color: rgba(111, 103, 95, 0.72);
}

.rail-notes,
.rail-sources {
  display: grid;
  gap: 10px;
}

.rail-notes p,
.rail-sources a {
  margin: 0;
}

.rail-sources a {
  display: block;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid var(--rule);
  background: rgba(255, 255, 255, 0.5);
}

@media (max-width: 1220px) {
  .frame {
    grid-template-columns: 1fr;
  }

  .sidebar,
  .rail {
    position: static;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 840px) {
  .shell {
    width: min(100% - 16px, 1480px);
    padding-top: 10px;
  }

  .page {
    padding: 16px;
    border-radius: 24px;
  }

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

  .card-grid {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    grid-template-columns: 46px minmax(0, 1fr);
  }

  .sidebar-card,
  .rail-card {
    border-radius: 18px;
  }

  .top-chips {
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 4px;
    -webkit-overflow-scrolling: touch;
  }
}