:root {
  color-scheme: light;
  --bg: #f2efe6;
  --panel: #fffaf0;
  --paper: #fffdf7;
  --ink: #1a2320;
  --muted: #64706c;
  --line: #d8d0bf;
  --accent: #0b6f68;
  --accent-2: #9b5f2b;
  --soft: #e4f0eb;
  --warn: #9f5818;
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 78% 8%, rgba(11, 111, 104, 0.12), transparent 30%),
    linear-gradient(135deg, rgba(155, 95, 43, 0.08), transparent 38%),
    var(--bg);
}

button,
input {
  font: inherit;
}

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(280px, 340px) 1fr;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  border-right: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 250, 240, 0.96), rgba(255, 250, 240, 0.9)),
    repeating-linear-gradient(0deg, transparent, transparent 23px, rgba(26, 35, 32, 0.03) 24px);
  padding: 22px 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
}

.brand strong,
.brand span {
  display: block;
}

.brand span {
  color: var(--muted);
  font-size: 13px;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background:
    linear-gradient(135deg, transparent 48%, rgba(255, 255, 255, 0.9) 49% 53%, transparent 54%),
    linear-gradient(135deg, var(--accent), var(--accent-2));
}

.nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 18px;
}

.nav-item {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  min-height: 40px;
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
  padding: 0 12px;
}

.nav-item.active,
.nav-item:hover,
.nav-item:focus-visible {
  border-color: var(--accent);
  background: var(--soft);
  outline: 0;
}

.search-wrap {
  margin-bottom: 18px;
}

.search-wrap label {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 6px;
}

.search-wrap input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 40px;
  padding: 0 12px;
  background: #fff;
}

.search-wrap input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(11, 111, 104, 0.12);
  outline: 0;
}

.list {
  display: grid;
  gap: 8px;
}

.list button {
  border: 0;
  border-left: 3px solid transparent;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  padding: 9px 10px;
  min-height: 38px;
  width: 100%;
}

.list button.active,
.list button:hover,
.list button:focus-visible {
  border-left-color: var(--accent);
  background: #f0eee6;
  outline: 0;
}

.list small {
  display: block;
  color: var(--muted);
  margin-top: 2px;
  line-height: 1.45;
}

.nav-group {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.45);
  overflow: hidden;
}

.nav-group summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  cursor: pointer;
  padding: 10px 12px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  list-style: none;
}

.nav-group summary::-webkit-details-marker {
  display: none;
}

.nav-group summary::before {
  content: "+";
  color: var(--accent);
  font-weight: 800;
}

.nav-group[open] summary::before {
  content: "−";
}

.nav-group summary span {
  flex: 1;
}

.nav-group summary em {
  color: var(--muted);
  font-style: normal;
  font-size: 12px;
}

.nav-group button {
  border-top: 1px solid rgba(216, 208, 191, 0.65);
  padding-left: 18px;
}

.content {
  min-width: 0;
}

.overview-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 460px);
  gap: 28px;
  align-items: center;
  padding: 44px clamp(20px, 5vw, 72px) 34px;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(255, 250, 240, 0.92), rgba(250, 246, 236, 0.86)),
    radial-gradient(circle at 88% 38%, rgba(11, 111, 104, 0.14), transparent 36%);
}

.eyebrow {
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  margin: 8px 0 12px;
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.08;
  letter-spacing: 0;
}

.summary {
  max-width: 720px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.65;
  margin: 0;
}

#map {
  width: 100%;
  max-width: 460px;
  height: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fffdf8;
}

.overview-band.is-detail {
  grid-template-columns: 1fr;
  min-height: 210px;
  padding-top: 34px;
  padding-bottom: 34px;
  background:
    linear-gradient(90deg, rgba(255, 250, 240, 0.94), rgba(243, 238, 226, 0.82)),
    radial-gradient(circle at 78% 32%, rgba(139, 94, 52, 0.12), transparent 34%);
}

.overview-band.is-detail #map {
  display: none;
}

.overview-band.is-detail h1 {
  max-width: 720px;
}

.overview-band.is-detail .summary {
  max-width: 760px;
}

.article {
  max-width: 920px;
  padding: 32px clamp(20px, 5vw, 72px) 72px;
  line-height: 1.78;
}

.detail-meta {
  display: grid;
  gap: 6px;
  margin: 0 0 18px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background:
    linear-gradient(135deg, rgba(228, 240, 235, 0.72), rgba(255, 253, 247, 0.9)),
    var(--paper);
}

.detail-meta span {
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.detail-meta strong {
  font-size: 18px;
}

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

.section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 24px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.section-nav span {
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(255, 253, 247, 0.8);
  padding: 5px 10px;
  font-size: 12px;
}

.home-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 30px;
}

.metric-card,
.intro-panel,
.module-card,
.case-card,
.route-card,
.route-panel {
  border: 1px solid var(--line);
  background: rgba(255, 253, 247, 0.82);
  border-radius: 8px;
  box-shadow: 0 16px 40px rgba(48, 42, 31, 0.06);
}

.metric-card {
  padding: 18px;
}

.metric-card span {
  display: block;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.metric-card strong {
  display: block;
  margin: 6px 0;
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1;
}

.metric-card p,
.intro-panel p {
  margin: 0;
  color: var(--muted);
}

.intro-panel {
  padding: 22px;
  margin: 18px 0 28px;
}

.module-grid,
.case-grid,
.route-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 14px 0 30px;
}

.module-card,
.case-card,
.route-card {
  display: block;
  width: 100%;
  min-height: 92px;
  padding: 16px;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.module-card:hover,
.case-card:hover,
.route-card:hover,
.module-card:focus-visible,
.case-card:focus-visible,
.route-card:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 18px 42px rgba(11, 111, 104, 0.12);
  transform: translateY(-2px);
  outline: 0;
}

.module-card strong,
.case-card strong,
.route-card strong {
  display: block;
  margin-bottom: 7px;
  font-size: 16px;
}

.case-card em,
.route-card em {
  display: inline-block;
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 12px;
  font-style: normal;
  font-weight: 800;
}

.module-card span,
.case-card span,
.route-card span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

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

.route-card {
  min-height: 150px;
}

.route-panel {
  padding: 20px;
  margin: 0 0 18px;
}

.route-panel h2 {
  margin-top: 0;
}

.route-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.route-chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fffdf7;
  color: var(--ink);
  cursor: pointer;
  padding: 7px 11px;
  font-size: 13px;
}

.route-chip:hover,
.route-chip:focus-visible {
  border-color: var(--accent);
  background: var(--soft);
  outline: 0;
}

.article h1 {
  font-size: 30px;
  margin-top: 0;
}

.article h2 {
  font-size: 22px;
  margin: 34px 0 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.article h2.section-observation,
.article h2.section-action {
  border-top-color: var(--accent);
  color: var(--accent);
}

.article h2.section-links,
.article h2.section-sources {
  color: var(--accent-2);
}

.article h3 {
  font-size: 17px;
  margin: 24px 0 8px;
}

.article p,
.article li {
  color: #2f3840;
}

.article p {
  margin: 10px 0 16px;
}

.article ul {
  padding-left: 1.25rem;
}

.article ol {
  padding-left: 1.45rem;
}

.article blockquote {
  margin: 18px 0;
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  background: var(--soft);
}

.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  overflow-wrap: anywhere;
}

.article th,
.article td {
  border: 1px solid var(--line);
  padding: 9px 10px;
  vertical-align: top;
}

.article th {
  background: #f0eee6;
}

.status-note {
  border: 1px solid #e5bf84;
  background: #fff7e8;
  color: var(--warn);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 18px;
}

@media (max-width: 860px) {
  .app-shell {
    display: block;
  }

  .sidebar {
    position: relative;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .overview-band {
    grid-template-columns: 1fr;
    padding-top: 28px;
  }

  .home-grid,
  .module-grid,
  .case-grid,
  .route-grid {
    grid-template-columns: 1fr;
  }

  .article {
    padding-bottom: 46px;
  }
}

@media (max-width: 560px) {
  .sidebar {
    padding: 16px 14px;
  }

  .nav {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav-item {
    text-align: center;
    padding: 0 6px;
  }

  #map {
    display: none;
  }

  .article h2 {
    font-size: 20px;
  }
}