:root {
  --paper: #f7f4ee;
  --panel: #fffdfa;
  --ink: #1e252b;
  --muted: #6f756f;
  --line: #ded8cb;
  --teal: #18746c;
  --teal-ink: #0f4f4b;
  --gold: #b7791f;
  --rust: #a94f37;
  --shadow: 0 20px 60px rgba(28, 34, 39, .10);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  color: var(--ink);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  letter-spacing: 0;
}

a {
  color: var(--teal-ink);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  padding: 24px 18px;
  border-right: 1px solid var(--line);
  background: #ebe5d8;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
  margin-bottom: 22px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--ink);
  color: #f7f4ee;
  font-weight: 800;
}

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

.brand small {
  color: var(--muted);
  margin-top: 2px;
}

.search-box {
  position: relative;
  margin-bottom: 24px;
}

.search-box label {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 7px;
}

.search-box input {
  width: 100%;
  min-height: 42px;
  border: 1px solid #cfc6b6;
  border-radius: 8px;
  padding: 10px 12px;
  background: var(--panel);
  color: var(--ink);
  outline: none;
}

.search-box input:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(24, 116, 108, .14);
}

.search-results {
  position: absolute;
  z-index: 10;
  width: 100%;
  max-height: 420px;
  overflow: auto;
  margin-top: 8px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.search-result {
  display: block;
  padding: 10px;
  border-radius: 7px;
  text-decoration: none;
}

.search-result:hover {
  background: #f0ece2;
}

.search-result strong,
.search-result small,
.search-result span {
  display: block;
}

.search-result small {
  color: var(--gold);
  margin: 3px 0;
}

.search-result span {
  color: var(--muted);
  line-height: 1.45;
}

.nav-group {
  padding: 10px 0;
  border-top: 1px solid rgba(30, 37, 43, .10);
}

.nav-group summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  list-style: none;
  user-select: none;
  margin: 0;
  padding: 7px 10px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 800;
  color: var(--rust);
}

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

.nav-group summary::after {
  content: "+";
  color: var(--muted);
  font-size: 16px;
}

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

.nav-group summary:hover {
  background: rgba(255, 253, 250, .56);
}

.nav-link {
  display: grid;
  gap: 2px;
  padding: 9px 10px;
  border-radius: 8px;
  color: var(--ink);
  text-decoration: none;
}

.nav-link small {
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-link:hover,
.nav-link.active {
  background: rgba(255, 253, 250, .74);
}

.nav-link.active {
  box-shadow: inset 3px 0 0 var(--teal);
}

.main {
  min-width: 0;
  padding: 34px clamp(18px, 4vw, 64px) 80px;
}

.page-header {
  max-width: 1040px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 18px;
  margin: 0 auto 22px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-header h1 {
  margin: 4px 0 0;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.15;
}

.breadcrumb,
.eyebrow {
  margin: 0;
  color: var(--gold);
  font-size: 13px;
  font-weight: 700;
}

.top-home {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 12px;
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
}

.content-shell {
  max-width: 1040px;
  margin: 0 auto;
}

.content-shell.has-toc {
  max-width: 1280px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 34px;
  align-items: start;
}

.doc-content {
  min-width: 0;
  font-size: 16px;
  line-height: 1.78;
}

.doc-content > h1:first-child {
  display: none;
}

.doc-content h2 {
  margin-top: 38px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 25px;
}

.doc-content h3 {
  margin-top: 26px;
  font-size: 19px;
}

.doc-content p,
.doc-content li {
  color: #2e353b;
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  overflow: hidden;
  border-radius: 8px;
  background: var(--panel);
}

.doc-content th,
.doc-content td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  vertical-align: top;
}

.doc-content th {
  background: #ece5d7;
  text-align: left;
}

.doc-content blockquote {
  margin: 18px 0;
  padding: 2px 0 2px 18px;
  border-left: 4px solid var(--gold);
  color: var(--muted);
}

.doc-content code {
  border-radius: 6px;
  padding: 2px 5px;
  background: #e8e0d0;
  color: #1f332f;
}

.doc-content pre {
  position: relative;
  overflow: auto;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #22282d;
  color: #f8f3e7;
}

.doc-content pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

.copyable-block {
  position: relative;
}

.copyable-block pre {
  padding-top: 46px;
}

.copy-button {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
  min-height: 30px;
  padding: 5px 10px;
  border: 1px solid rgba(255, 253, 250, .34);
  border-radius: 7px;
  background: rgba(255, 253, 250, .12);
  color: #f8f3e7;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}

.copy-button:hover {
  background: rgba(255, 253, 250, .22);
}

.doc-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 20px auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.flowchart-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin: 22px 0;
}

.flowchart-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: var(--panel);
}

.flowchart-card img {
  width: 100%;
  margin: 0 0 12px;
}

.flowchart-card h2 {
  margin: 8px 0;
  padding: 0;
  border: 0;
  font-size: 18px;
}

.flowchart-card p {
  margin: 8px 0 0;
}

.toc-panel {
  position: sticky;
  top: 28px;
  max-height: calc(100vh - 56px);
  overflow: auto;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 250, .72);
}

.toc-panel h2 {
  margin: 0 0 10px;
  font-size: 14px;
  color: var(--rust);
}

.toc-link {
  display: block;
  padding: 6px 0;
  color: var(--muted);
  text-decoration: none;
  line-height: 1.35;
}

.toc-link:hover {
  color: var(--teal-ink);
}

.toc-link.level-3 {
  padding-left: 12px;
}

.hero-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(260px, .65fr);
  gap: 26px;
  margin-bottom: 34px;
  padding: clamp(24px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(135deg, #fffdfa 0%, #f0eadf 58%, #e6eee9 100%);
  box-shadow: var(--shadow);
}

.hero-panel h2 {
  margin: 6px 0 12px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.08;
  max-width: 720px;
}

.hero-panel p {
  max-width: 760px;
  margin: 0;
  color: #374149;
  font-size: 18px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  align-content: start;
}

.stat {
  min-height: 92px;
  padding: 16px;
  border: 1px solid rgba(30, 37, 43, .14);
  border-radius: 8px;
  background: rgba(255, 253, 250, .72);
}

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

.stat strong {
  font-size: 31px;
  line-height: 1;
}

.stat span {
  margin-top: 8px;
  color: var(--muted);
}

.browse-panel {
  margin: 0 0 22px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 253, 250, .72);
}

.panel-heading {
  margin-bottom: 14px;
}

.browse-panel h2 {
  margin: 4px 0 0;
  padding: 0;
  border: 0;
  font-size: 23px;
}

.quick-grid,
.topic-grid,
.directory-grid {
  display: grid;
  gap: 12px;
}

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

.topic-grid,
.directory-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.browse-card,
.directory-card {
  min-height: 118px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  padding: 16px;
  border: 1px solid rgba(30, 37, 43, .12);
  border-radius: 8px;
  background: #fffdfa;
  color: var(--ink);
  text-decoration: none;
}

.directory-card {
  min-height: 132px;
}

.browse-card:hover,
.directory-card:hover {
  border-color: rgba(24, 116, 108, .45);
  box-shadow: 0 12px 30px rgba(28, 34, 39, .08);
  transform: translateY(-1px);
}

.browse-card strong,
.browse-card span,
.directory-card strong,
.directory-card span {
  display: block;
}

.browse-card span,
.directory-card span {
  color: var(--muted);
  line-height: 1.55;
}

.browse-card.disabled {
  pointer-events: none;
  opacity: .45;
}

.pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 44px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.pager-link {
  min-height: 84px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
}

.pager-link span {
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
}

.pager-link.next {
  text-align: right;
}

@media (max-width: 980px) {
  .layout {
    display: block;
  }

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

  .nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 8px 16px;
  }

  .page-header {
    display: block;
  }

  .content-shell.has-toc {
    display: block;
  }

  .toc-panel {
    display: none;
  }

  .top-home {
    display: inline-block;
    margin-top: 12px;
  }

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

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

@media (max-width: 620px) {
  .sidebar {
    max-height: 36vh;
    overflow: auto;
    padding: 16px 14px;
  }

  .brand {
    margin-bottom: 14px;
  }

  .search-box {
    margin-bottom: 14px;
  }

  .nav {
    display: block;
  }

  .nav-group {
    padding: 6px 0;
  }

  .nav-link {
    padding: 7px 9px;
  }

  .main {
    padding: 24px 14px 56px;
  }

  .page-header h1 {
    font-size: clamp(30px, 9vw, 38px);
  }

  .hero-panel {
    padding: 20px;
  }

  .hero-panel h2 {
    font-size: 30px;
  }

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

  .quick-grid,
  .topic-grid,
  .directory-grid,
  .pager {
    grid-template-columns: 1fr;
  }

  .doc-content table {
    display: block;
    overflow-x: auto;
  }
}