:root {
  --bg: #ffffff;
  --bg-soft: #f7f7fa;
  --bg-muted: #f3f4f6;
  --text: #1f2937;
  --text-soft: #4b5563;
  --text-faint: #6b7280;
  --primary: #6366f1;
  --primary-deep: #4f46e5;
  --border: #e5e7eb;
  --code-bg: #111827;
  --code-text: #d1d5db;
  --nav-h: 58px;
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --shadow-soft: 0 1px 2px rgba(15, 23, 42, 0.04);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: var(--nav-h);
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: saturate(140%) blur(6px);
}

.nav-wrap {
  max-width: 1280px;
  margin: 0 auto;
  height: 100%;
  padding: 0 clamp(14px, 2.4vw, 24px);
  display: flex;
  align-items: center;
  gap: 14px;
}

.menu-toggle {
  display: none;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: #fff;
  color: var(--text-soft);
  font-size: 18px;
}

.brand {
  flex: 0 0 auto;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0;
  color: #111827;
  white-space: nowrap;
}

.search-wrap {
  flex: 0 0 clamp(220px, 26vw, 260px);
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0 10px;
  height: 34px;
}

.search-wrap input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-size: 13px;
}

.search-shortcut {
  padding: 2px 7px;
  border-radius: 7px;
  border: 1px solid #d1d5db;
  color: var(--text-faint);
  font-size: 12px;
  line-height: 1.3;
}

.top-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
}

.top-nav a {
  color: #374151;
  font-size: 14px;
  padding: 6px 9px;
  border-radius: 8px;
}

.top-nav a.active,
.top-nav a:hover {
  color: var(--primary-deep);
  background: #eef2ff;
}

.theme-btn {
  width: 40px;
  height: 24px;
  border-radius: 999px;
  border: 1px solid #d1d5db;
  background: #f3f4f6;
  position: relative;
}

.theme-btn::before {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid #d1d5db;
}

.home-main {
  padding: calc(var(--nav-h) + clamp(44px, 5vw, 68px)) clamp(14px, 2.4vw, 24px)
    clamp(56px, 7vw, 84px);
}

.hero {
  max-width: 1080px;
  margin: 0 auto;
}

.hero-title {
  margin: 0;
  font-size: clamp(38px, 5vw, 72px);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.hero-title .primary {
  color: var(--primary);
}

.hero-subtitle {
  margin-top: 26px;
  color: var(--text-soft);
  font-size: clamp(16px, 1.7vw, 30px);
  line-height: 1.45;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 134px;
  height: 46px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 600;
  padding: 0 22px;
  border: 1px solid transparent;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(90deg, #4f46e5, #6366f1);
}

.btn-soft {
  color: #1f2937;
  background: #eef0f4;
  border-color: #e5e7eb;
}

.feature-grid {
  margin-top: clamp(52px, 7vw, 78px);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(12px, 1.5vw, 16px);
}

.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: clamp(18px, 2vw, 24px);
  box-shadow: var(--shadow-soft);
  min-height: clamp(184px, 18vw, 230px);
}

.feature-icon {
  width: clamp(38px, 3.4vw, 44px);
  height: clamp(38px, 3.4vw, 44px);
  border-radius: clamp(10px, 1vw, 12px);
  display: grid;
  place-items: center;
  background: #e6e9ff;
  color: var(--primary);
  font-size: clamp(15px, 1.3vw, 18px);
  margin-bottom: 14px;
}

.feature-title {
  margin: 0 0 10px;
  font-size: clamp(18px, 1.7vw, 22px);
}

.feature-text {
  margin: 0;
  color: var(--text-soft);
  font-size: clamp(13px, 1.1vw, 14px);
  line-height: 1.7;
}

.sdk-home {
  margin-top: clamp(60px, 8vw, 86px);
}

.section-head {
  text-align: center;
}

.section-head h2 {
  margin: 0;
  color: var(--primary);
  font-size: clamp(24px, 3.4vw, 40px);
}

.section-head p {
  margin: 14px 0 0;
  color: var(--text-soft);
  font-size: clamp(14px, 1.6vw, 18px);
}

.sdk-grid {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(10px, 1.4vw, 14px);
}

.sdk-item {
  background: #fbfbfd;
  border: 1px solid #dde0e7;
  border-radius: var(--radius-md);
  padding: clamp(12px, 1.6vw, 16px) clamp(12px, 1.8vw, 18px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  min-height: clamp(62px, 8vw, 78px);
}

.sdk-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.sdk-icon {
  width: clamp(22px, 2.3vw, 26px);
  height: clamp(22px, 2.3vw, 26px);
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: #eef2ff;
  font-size: clamp(12px, 1.2vw, 14px);
  flex: 0 0 auto;
}

.sdk-copy {
  min-width: 0;
}

.sdk-name {
  margin: 0;
  font-size: clamp(15px, 1.3vw, 18px);
  font-weight: 700;
}

.sdk-desc {
  margin: 4px 0 0;
  color: var(--text-faint);
  font-size: clamp(12px, 1vw, 14px);
}

.sdk-arrow {
  color: #9ca3af;
  font-size: clamp(14px, 1.3vw, 20px);
}

.doc-main {
  padding-top: var(--nav-h);
}

.doc-wrap {
  max-width: 1460px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 300px minmax(0, 780px) 240px;
  gap: 30px;
  padding: 22px 24px 64px;
}

.doc-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 16px);
  height: calc(100vh - var(--nav-h) - 24px);
  overflow: auto;
  padding-right: 14px;
  border-right: 1px solid var(--border);
}

.sidebar-group {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.sidebar-group h4 {
  margin: 0 0 10px;
  font-size: 16px;
}

.sidebar-link {
  display: block;
  padding: 7px 0;
  color: #334155;
  font-size: 15px;
}

.sidebar-link.active {
  color: var(--primary-deep);
  font-weight: 600;
}

.doc-content {
  max-width: 780px;
}

.doc-content > h1 {
  margin: 26px 0 30px;
  font-size: clamp(30px, 3.6vw, 42px);
  color: var(--primary);
  line-height: 1.2;
}

.doc-section {
  padding: 18px 0 8px;
  border-top: 1px solid var(--border);
}

.doc-section h2 {
  margin: 0 0 14px;
  font-size: clamp(22px, 2.1vw, 28px);
}

.doc-section p {
  margin: 0 0 14px;
  color: var(--text-soft);
  line-height: 1.75;
  font-size: clamp(14px, 1.15vw, 15px);
}

.doc-note {
  padding: 14px 16px;
  border-left: 3px solid #a5b4fc;
  background: #f5f7ff;
  border-radius: 8px;
}

.toc {
  position: sticky;
  top: calc(var(--nav-h) + 24px);
  align-self: start;
  border-left: 1px solid var(--border);
  padding-left: 16px;
}

.toc h4 {
  margin: 8px 0 8px;
  font-size: 16px;
}

.toc a {
  display: block;
  color: #4b5563;
  font-size: 14px;
  padding: 6px 0;
}

.toc a.active {
  color: var(--primary-deep);
  font-weight: 600;
}

.api-card,
.doc-card {
  background: #fafbff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  margin-bottom: 16px;
}

.api-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.api-head h3,
.doc-card h3 {
  margin: 0;
  font-size: clamp(17px, 1.5vw, 20px);
}

.method {
  background: #e0e7ff;
  color: #312e81;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-radius: 999px;
  padding: 4px 10px;
}

.api-path {
  display: inline-block;
  margin: 4px 0 10px;
  padding: 6px 10px;
  border-radius: 8px;
  background: #f3f4f6;
  color: #111827;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
}

table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  margin: 10px 0 12px;
}

th,
td {
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
  text-align: left;
  padding: 10px;
  font-size: 13px;
}

tr:last-child td {
  border-bottom: 0;
}

th:last-child,
td:last-child {
  border-right: 0;
}

th {
  background: #f9fafb;
}

pre {
  margin: 0;
  padding: 14px;
  border-radius: 10px;
  overflow: auto;
  background: var(--code-bg);
  color: var(--code-text);
  font-size: 12px;
  line-height: 1.6;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.doc-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.empty-tip {
  display: none;
  margin-top: 16px;
  padding: 12px 14px;
  border: 1px dashed #cbd5e1;
  border-radius: 10px;
  color: #64748b;
  background: #f8fafc;
  font-size: 14px;
}

.overlay {
  display: none;
}

@media (max-width: 1320px) {
  .feature-grid,
  .sdk-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .doc-wrap {
    grid-template-columns: 280px minmax(0, 1fr);
  }

  .toc {
    display: none;
  }
}

@media (max-width: 960px) {
  :root {
    --nav-h: 54px;
  }

  .menu-toggle {
    display: inline-grid;
    place-items: center;
  }

  .brand {
    font-size: 14px;
  }

  .search-wrap {
    flex: 1;
    min-width: 0;
    height: 32px;
  }

  .top-nav {
    display: none;
  }

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

  .card {
    min-height: 190px;
  }

  .doc-wrap {
    padding: 14px 14px 44px;
  }

  .doc-wrap {
    grid-template-columns: minmax(0, 1fr);
  }

  .doc-sidebar {
    position: fixed;
    left: 0;
    top: var(--nav-h);
    bottom: 0;
    width: 280px;
    height: auto;
    transform: translateX(-110%);
    transition: transform 0.25s ease;
    background: #fff;
    z-index: 60;
    margin: 0;
    padding: 8px 16px 24px;
    border-right: 1px solid var(--border);
  }

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

  .overlay {
    display: block;
    position: fixed;
    inset: var(--nav-h) 0 0;
    background: rgba(15, 23, 42, 0.28);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    z-index: 55;
  }

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

@media (max-width: 640px) {
  :root {
    --nav-h: 52px;
  }

  .home-main {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-title {
    font-size: clamp(34px, 10vw, 44px);
    line-height: 1.12;
  }

  .hero-subtitle {
    margin-top: 18px;
    line-height: 1.6;
  }

  .feature-grid,
  .sdk-grid,
  .doc-grid {
    grid-template-columns: 1fr;
  }

  .feature-title,
  .sdk-name,
  .doc-section h2 {
    font-size: 20px;
  }

  .hero-subtitle,
  .section-head p,
  .doc-section p {
    font-size: 15px;
  }

  .card {
    min-height: 0;
  }

  .sdk-item {
    min-height: 58px;
  }
}