:root {
  --c-bg: #f4f6fb;
  --c-bg-elevated: rgba(255, 255, 255, 0.94);
  --c-bg-sidebar: #f8f9fd;
  --c-bg-soft: #eef2ff;
  --c-bg-code: #0f172a;
  --c-text: #172033;
  --c-text-muted: #5d6881;
  --c-text-soft: #8893aa;
  --c-border: rgba(23, 32, 51, 0.1);
  --c-brand: #275df5;
  --c-brand-strong: #1747ce;
  --c-brand-soft: rgba(39, 93, 245, 0.11);
  --c-success: #0f9f6e;
  --c-warning: #dd8a16;
  --c-danger: #d9475c;
  --shadow-sm: 0 10px 30px rgba(23, 32, 51, 0.06);
  --shadow-lg: 0 25px 80px rgba(23, 32, 51, 0.12);
  --radius: 16px;
  --radius-lg: 28px;
  --sidebar-width: 290px;
  --header-height: 68px;
  --transition: 0.22s ease;
  --font-sans: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Consolas, monospace;
}

[data-theme="dark"] {
  --c-bg: #0b1020;
  --c-bg-elevated: rgba(16, 23, 43, 0.92);
  --c-bg-sidebar: #0f162a;
  --c-bg-soft: rgba(39, 93, 245, 0.12);
  --c-bg-code: #08101f;
  --c-text: #edf2ff;
  --c-text-muted: #a6b0c8;
  --c-text-soft: #6c7690;
  --c-border: rgba(237, 242, 255, 0.08);
  --c-brand: #7ea2ff;
  --c-brand-strong: #a9beff;
  --c-brand-soft: rgba(126, 162, 255, 0.14);
  --c-success: #3dd4a0;
  --c-warning: #f3b454;
  --c-danger: #ff7b8f;
  --shadow-sm: 0 10px 30px rgba(0, 0, 0, 0.24);
  --shadow-lg: 0 25px 80px rgba(0, 0, 0, 0.32);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--c-text);
  background:
    radial-gradient(circle at top left, rgba(39, 93, 245, 0.16), transparent 28%),
    radial-gradient(circle at top right, rgba(19, 71, 206, 0.08), transparent 20%),
    var(--c-bg);
  transition: background var(--transition), color var(--transition);
}

a {
  color: var(--c-brand);
  text-decoration: none;
}

code,
pre {
  font-family: var(--font-mono);
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 22px;
  backdrop-filter: blur(20px);
  background: var(--c-bg-elevated);
  border-bottom: 1px solid var(--c-border);
}

.header-left,
.header-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--c-text);
  font-weight: 700;
  font-size: 18px;
}

.logo-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--c-brand), var(--c-brand-strong));
  color: white;
  box-shadow: var(--shadow-sm);
}

.header-link,
.theme-toggle,
.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 38px;
  min-width: 38px;
  padding: 0 14px;
  border-radius: 12px;
  border: 1px solid var(--c-border);
  background: transparent;
  color: var(--c-text);
  cursor: pointer;
  transition: all var(--transition);
}

.header-link:hover,
.theme-toggle:hover,
.menu-toggle:hover {
  border-color: var(--c-brand);
  color: var(--c-brand);
  background: var(--c-brand-soft);
}

.menu-toggle {
  display: none;
}

.layout {
  display: flex;
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height));
}

.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  overflow-y: auto;
  background: var(--c-bg-sidebar);
  border-right: 1px solid var(--c-border);
  padding: 18px 0 28px;
  z-index: 120;
  transition: transform 0.28s ease;
}

.sidebar-overlay {
  position: fixed;
  inset: var(--header-height) 0 0 0;
  background: rgba(5, 10, 22, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
  z-index: 110;
}

.search-box {
  padding: 0 18px 16px;
  position: relative;
}

.search-icon {
  position: absolute;
  left: 30px;
  top: 12px;
  color: var(--c-text-soft);
  font-size: 14px;
}

.search-input {
  width: 100%;
  border: 1px solid var(--c-border);
  border-radius: 14px;
  background: var(--c-bg-elevated);
  color: var(--c-text);
  padding: 11px 14px 11px 38px;
  outline: none;
}

.sidebar-section {
  margin-bottom: 10px;
}

.sidebar-section-title {
  padding: 8px 20px 6px;
  color: var(--c-text-soft);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 2px 12px;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--c-text-muted);
  cursor: pointer;
  transition: all var(--transition);
}

.sidebar-item:hover {
  color: var(--c-text);
  background: rgba(255, 255, 255, 0.55);
}

[data-theme="dark"] .sidebar-item:hover {
  background: rgba(255, 255, 255, 0.04);
}

.sidebar-item.active {
  color: var(--c-brand);
  background: var(--c-brand-soft);
  font-weight: 700;
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  height: 22px;
  padding: 0 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
}

.badge-hot {
  background: rgba(15, 159, 110, 0.15);
  color: var(--c-success);
}

.main {
  width: 100%;
  margin-left: var(--sidebar-width);
  padding: 34px 48px 96px;
}

.doc-page {
  display: none;
  max-width: 980px;
}

.doc-page.active {
  display: block;
  animation: fadeIn 0.24s ease;
}

.hero {
  padding: 34px;
  border-radius: var(--radius-lg);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(236, 242, 255, 0.88));
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .hero {
  background: linear-gradient(145deg, rgba(18, 27, 49, 0.94), rgba(9, 15, 32, 0.94));
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--c-brand-soft);
  color: var(--c-brand);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1,
.doc-page h1 {
  margin: 16px 0 10px;
  font-size: clamp(34px, 4vw, 56px);
  line-height: 1.02;
}

.hero-subtitle,
.subtitle {
  color: var(--c-text-muted);
  font-size: 17px;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 24px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.hero-stat {
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--c-border);
  background: rgba(255, 255, 255, 0.62);
}

[data-theme="dark"] .hero-stat {
  background: rgba(255, 255, 255, 0.03);
}

.hero-stat-label {
  display: block;
  margin-bottom: 6px;
  color: var(--c-text-soft);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 14px;
  border: 1px solid var(--c-border);
  font-weight: 700;
  transition: all var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--c-brand), var(--c-brand-strong));
  color: white;
  border-color: transparent;
}

.btn-secondary {
  color: var(--c-text);
  background: transparent;
}

.feature-grid,
.card-grid {
  display: grid;
  gap: 18px;
  margin-top: 28px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.feature-card,
.card,
.callout,
.info-table,
.faq-list details {
  border: 1px solid var(--c-border);
  background: var(--c-bg-elevated);
  box-shadow: var(--shadow-sm);
}

.feature-card,
.card {
  border-radius: 20px;
  padding: 22px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.feature-card:hover,
.card:hover {
  transform: translateY(-3px);
  border-color: rgba(39, 93, 245, 0.24);
  box-shadow: var(--shadow-lg);
}

.feature-icon,
.card-icon {
  font-size: 24px;
}

.feature-title,
.card-title {
  margin-top: 14px;
  font-size: 18px;
  font-weight: 700;
}

.feature-desc,
.card-desc {
  margin-top: 8px;
  color: var(--c-text-muted);
  line-height: 1.75;
}

.card {
  color: inherit;
}

.doc-page h2 {
  margin-top: 36px;
  margin-bottom: 14px;
  font-size: 28px;
}

.doc-preview {
  margin-top: 28px;
}

.doc-preview-window {
  border-radius: 24px;
  overflow: hidden;
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-lg);
  background: linear-gradient(180deg, rgba(255,255,255,0.96), rgba(241,245,255,0.9));
}

[data-theme="dark"] .doc-preview-window {
  background: linear-gradient(180deg, rgba(13,18,34,0.96), rgba(10,15,31,0.96));
}

.window-dots {
  display: flex;
  gap: 8px;
  padding: 16px 18px 10px;
}

.window-dots span {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: rgba(23, 32, 51, 0.2);
}

.window-dots span:nth-child(1) { background: #ff6b6b; }
.window-dots span:nth-child(2) { background: #f5b041; }
.window-dots span:nth-child(3) { background: #33c27f; }

.window-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0 18px 14px;
}

.window-pill {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--c-border);
  background: var(--c-bg-elevated);
  color: var(--c-text-muted);
  font-size: 12px;
  font-weight: 700;
}

.preview-code {
  margin: 0;
  border-radius: 0;
  box-shadow: none;
}

.doc-page p,
.doc-page li {
  line-height: 1.8;
}

.steps {
  padding-left: 22px;
}

.steps li {
  margin: 18px 0;
}

.steps h3 {
  margin-bottom: 6px;
}

pre {
  position: relative;
  margin: 18px 0 0;
  padding: 22px;
  border-radius: 18px;
  background: var(--c-bg-code);
  color: #e2e8f0;
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
}

pre code {
  white-space: pre;
  font-size: 13px;
  line-height: 1.75;
}

.copy-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.08);
  color: white;
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
}

.callout {
  display: flex;
  gap: 14px;
  padding: 18px;
  border-radius: 18px;
  margin-top: 20px;
}

.callout-icon {
  font-size: 22px;
}

.tip {
  background: rgba(15, 159, 110, 0.08);
}

.note {
  background: rgba(39, 93, 245, 0.08);
}

.warning {
  background: rgba(221, 138, 22, 0.1);
}

.info-table {
  margin-top: 18px;
  border-radius: 18px;
  overflow: hidden;
}

.info-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 12px;
  padding: 14px 18px;
  border-top: 1px solid var(--c-border);
}

.info-row:first-child {
  border-top: 0;
}

.bullet-list {
  padding-left: 22px;
}

.faq-list {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.faq-list details {
  border-radius: 16px;
  padding: 16px 18px;
}

.faq-list summary {
  cursor: pointer;
  font-weight: 700;
}

.faq-list p {
  margin-top: 12px;
  color: var(--c-text-muted);
}

.hidden-by-search {
  display: none !important;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 960px) {
  .menu-toggle {
    display: inline-flex;
  }

  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar-open .sidebar {
    transform: translateX(0);
  }

  .sidebar-open .sidebar-overlay {
    opacity: 1;
    pointer-events: auto;
  }

  .main {
    margin-left: 0;
    padding: 26px 18px 72px;
  }

  .hero {
    padding: 26px 20px;
  }

  .info-row {
    grid-template-columns: 1fr;
  }
}