/* ============================================================
   文档站主题（亮 / 暗 双主题，由 [data-theme] 切换）
   ============================================================ */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-elev: #ffffff;
  --border: #e3e6ea;
  --text: #1f2329;
  --text-soft: #5b6470;
  --text-faint: #8a929c;
  --brand: #3b6cff;
  --brand-soft: #eaf0ff;
  --code-bg: #f2f3f5;
  --sidebar-w: 280px;
  --toc-w: 240px;
  --topbar-h: 56px;
  --maxw: 820px;
}
[data-theme="dark"] {
  --bg: #0f1115;
  --bg-soft: #161a21;
  --bg-elev: #181c24;
  --border: #262b35;
  --text: #e6e8ec;
  --text-soft: #aab1bd;
  --text-faint: #7a828f;
  --brand: #6ea8fe;
  --brand-soft: #1b2433;
  --code-bg: #1a1f29;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 15px;
}

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
}
.brand {
  font-weight: 700;
  font-size: 16px;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.search {
  width: 220px;
  max-width: 40vw;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 7px 11px;
  font-size: 13px;
  outline: none;
}
.search:focus { border-color: var(--brand); }
.topbar-link {
  color: var(--text-soft);
  text-decoration: none;
  font-size: 13px;
  padding: 6px 10px;
  border-radius: 8px;
}
.topbar-link:hover { background: var(--bg-soft); color: var(--text); }
.icon-btn {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text);
  width: 34px; height: 34px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 15px;
}
.icon-btn:hover { border-color: var(--brand); }

/* ---------- 布局 ---------- */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--toc-w);
  align-items: start;
}

/* ---------- 侧边栏树 ---------- */
.sidebar {
  position: sticky;
  top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  padding: 16px 10px 40px;
  border-right: 1px solid var(--border);
  background: var(--bg-soft);
}
.sidebar-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-faint);
  padding: 4px 10px 10px;
}
.nav-group { margin: 2px 0; }
.nav-summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  border-radius: 8px;
  padding: 0;
}
.nav-summary::-webkit-details-marker { display: none; }
.nav-summary::before {
  content: "▸";
  color: var(--text-faint);
  font-size: 10px;
  margin: 0 4px 0 6px;
  transition: transform .15s ease;
}
.nav-group[open] > .nav-summary::before { transform: rotate(90deg); }
.nav-link {
  display: block;
  flex: 1;
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--text-soft);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.4;
}
.nav-link:hover { background: var(--brand-soft); color: var(--text); }
.nav-link.active {
  background: var(--brand-soft);
  color: var(--brand);
  font-weight: 600;
}
.nav-children { margin-left: 14px; border-left: 1px solid var(--border); padding-left: 4px; }
.nav-link.leaf { padding-left: 22px; }

/* ---------- 主内容 ---------- */
.content {
  min-width: 0;
  padding: 36px 40px 64px;
  max-width: var(--maxw);
  margin: 0 auto;
  width: 100%;
}
.doc-title { font-size: 30px; margin: 0 0 18px; line-height: 1.25; }
.doc h2 { font-size: 22px; margin: 34px 0 12px; padding-top: 6px; }
.doc h3 { font-size: 18px; margin: 26px 0 10px; }
.doc p { margin: 12px 0; }
.doc ul, .doc ol { padding-left: 22px; }
.doc li { margin: 6px 0; }
.doc a { color: var(--brand); text-decoration: none; }
.doc a:hover { text-decoration: underline; }
.doc code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 5px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 13px;
}
.doc pre {
  background: var(--code-bg);
  padding: 16px;
  border-radius: 10px;
  overflow-x: auto;
  border: 1px solid var(--border);
}
.doc pre code { background: none; padding: 0; }
.doc blockquote {
  margin: 14px 0;
  padding: 8px 16px;
  border-left: 4px solid var(--brand);
  background: var(--brand-soft);
  border-radius: 0 8px 8px 0;
  color: var(--text-soft);
}
.doc table {
  border-collapse: collapse;
  width: 100%;
  margin: 14px 0;
  font-size: 14px;
}
.doc th, .doc td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.doc th { background: var(--bg-soft); }

/* ---------- 上一页/下一页 ---------- */
.pager {
  display: flex;
  gap: 14px;
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}
.pn {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  min-width: 0;
}
.pn:hover { border-color: var(--brand); background: var(--brand-soft); }
.pn-next { text-align: right; }
.pn-label { font-size: 12px; color: var(--text-faint); }
.pn-title { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pn-empty { border: none; }

/* ---------- 本页目录 TOC ---------- */
.toc {
  position: sticky;
  top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  padding: 28px 16px;
  border-left: 1px solid var(--border);
}
.toc-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-faint);
  margin-bottom: 10px;
}
.toc-empty { font-size: 13px; color: var(--text-faint); }
.toc-list { list-style: none; margin: 0; padding: 0; }
.toc-list li { margin: 4px 0; }
.toc-list a {
  color: var(--text-soft);
  text-decoration: none;
  font-size: 13px;
  display: block;
  padding: 3px 0;
  border-left: 2px solid transparent;
  padding-left: 10px;
}
.toc-list a:hover { color: var(--brand); border-left-color: var(--brand); }
.toc-3 a { padding-left: 22px; font-size: 12.5px; }
.toc-list a.on { color: var(--brand); border-left-color: var(--brand); font-weight: 600; }

/* ---------- 落地页 ---------- */
.hero { padding: 28px 0 8px; }
.hero h1 { font-size: 38px; margin: 0 0 12px; }
.hero-desc { font-size: 17px; color: var(--text-soft); max-width: 640px; margin: 0 0 22px; }
.btn-primary {
  display: inline-block;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
}
.btn-primary:hover { opacity: .92; }
.section-heading { font-size: 20px; margin: 40px 0 16px; }
.section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
}
.section-card {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  background: var(--bg-elev);
  transition: border-color .15s, transform .15s;
}
.section-card:hover { border-color: var(--brand); transform: translateY(-2px); }
.section-card h3 { margin: 0 0 6px; font-size: 16px; }
.card-sub { font-size: 13px; color: var(--text-faint); }

/* ---------- 页脚 ---------- */
.site-footer {
  grid-column: 1 / -1;
  text-align: center;
  padding: 22px;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 13px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .layout { grid-template-columns: var(--sidebar-w) minmax(0, 1fr); }
  .toc { display: none; }
}
@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .content { padding: 24px 18px 48px; }
  .search { width: 130px; }
}

/* ============================================================
   落地页 / Showcase（暗色为主）
   ============================================================ */
.showcase-page { background: var(--bg); }

/* 顶部导航 */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 12px 24px;
  background: color-mix(in srgb, var(--bg-elev) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-nav .brand { font-weight: 700; font-size: 17px; color: var(--text); text-decoration: none; }
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 6px; }
.site-nav .nav-link {
  color: var(--text-soft);
  text-decoration: none;
  font-size: 14px;
  padding: 7px 12px;
  border-radius: 8px;
}
.site-nav .nav-link:hover { background: var(--bg-soft); color: var(--text); }

/* 主视觉 Hero */
.hero {
  position: relative;
  padding: 84px 24px 72px;
  text-align: center;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(700px 360px at 50% -10%, color-mix(in srgb, var(--brand) 28%, transparent), transparent 70%),
    radial-gradient(500px 300px at 85% 0%, color-mix(in srgb, var(--brand) 14%, transparent), transparent 70%);
  pointer-events: none;
}
.hero-inner { position: relative; max-width: 820px; margin: 0 auto; }
.badge {
  display: inline-block;
  font-size: 13px;
  color: var(--brand);
  background: var(--brand-soft);
  border: 1px solid color-mix(in srgb, var(--brand) 35%, transparent);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 20px;
}
.hero-title {
  font-size: 46px;
  line-height: 1.15;
  margin: 0 0 16px;
  background: linear-gradient(180deg, var(--text), color-mix(in srgb, var(--text) 70%, var(--brand)));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc { font-size: 18px; color: var(--text-soft); margin: 0 auto 28px; max-width: 640px; }
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn-ghost {
  display: inline-block;
  background: var(--bg-soft);
  color: var(--text);
  text-decoration: none;
  padding: 10px 20px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }

/* 通用区块标题 */
.section-head { text-align: center; max-width: 640px; margin: 0 auto 32px; }
.section-head h2 { font-size: 28px; margin: 0 0 8px; }
.section-head p { color: var(--text-soft); margin: 0; font-size: 15px; }

/* 特性网格 */
.features { padding: 64px 24px; }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  max-width: 1040px;
  margin: 0 auto;
}
.feature-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  transition: border-color .15s, transform .15s;
}
.feature-card:hover { border-color: var(--brand); transform: translateY(-3px); }
.feature-card .ic { font-size: 26px; }
.feature-card h3 { margin: 12px 0 6px; font-size: 17px; }
.feature-card p { margin: 0; color: var(--text-soft); font-size: 14px; line-height: 1.6; }

/* 文档示例卡片 */
.showcase { padding: 24px 24px 64px; }
.showcase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  max-width: 1040px;
  margin: 0 auto;
}
.show-card {
  display: block;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  text-decoration: none;
  color: var(--text);
  background: var(--bg-elev);
  transition: border-color .15s, transform .15s;
}
.show-card:hover { border-color: var(--brand); transform: translateY(-3px); }
.show-card h3 { margin: 0 0 8px; font-size: 17px; }
.card-sub { font-size: 13px; color: var(--text-faint); }

/* 工作流程 */
.how { padding: 24px 24px 72px; }
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  max-width: 1040px;
  margin: 0 auto;
}
.step {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
}
.step-num {
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  background: var(--brand); color: #fff;
  border-radius: 50%; font-weight: 700; margin-bottom: 12px;
}
.step h3 { margin: 0 0 6px; font-size: 17px; }
.step p { margin: 0; color: var(--text-soft); font-size: 14px; line-height: 1.6; }
.step code { background: var(--code-bg); padding: 2px 6px; border-radius: 5px; font-size: 13px; }

/* 页脚微调 */
.site-footer .foot-links { margin-left: 10px; }
.site-footer .foot-links a { color: var(--brand); text-decoration: none; }
.site-footer .foot-links a:hover { text-decoration: underline; }

@media (max-width: 760px) {
  .hero-title { font-size: 34px; }
  .features, .showcase, .how { padding-left: 18px; padding-right: 18px; }
}