:root {
  --brand: #08b89d;
  --brand-dark: #078b79;
  --blue: #2563eb;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #dbe3ee;
  --soft: #f5f8fb;
  --panel: #ffffff;
  --shadow: 0 16px 44px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: #f3f6fa;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.68;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 0 max(24px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid rgba(219, 227, 238, 0.72);
  background: rgba(255, 255, 255, 0.93);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-weight: 700;
  color: #0f3c3a;
}

.brand img {
  width: 132px;
  height: auto;
}

.brand span {
  padding-left: 14px;
  border-left: 1px solid #dbe3ee;
  white-space: nowrap;
}

.nav-links,
.nav-actions,
.doc-tabs {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-links {
  gap: 26px;
  color: #334155;
  font-size: 14px;
}

.nav-links a:hover {
  color: var(--brand-dark);
}

.primary-btn,
.secondary-btn,
.tab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.primary-btn {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--blue));
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.18);
}

.secondary-btn,
.tab-btn {
  color: #0f172a;
  background: #fff;
  border-color: var(--line);
}

.primary-btn:hover,
.secondary-btn:hover,
.tab-btn:hover {
  transform: translateY(-1px);
}

.eyebrow,
.section-label {
  display: inline-flex;
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

.layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 28px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 32px 28px 72px;
  align-items: start;
}

.side-panel {
  position: sticky;
  top: 98px;
  display: grid;
  gap: 18px;
}

.toc,
.sdk-panel {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
}

.toc strong,
.sdk-panel strong {
  display: block;
  margin-bottom: 12px;
}

.toc a,
.sdk-panel span {
  display: block;
  color: #334155;
  font-size: 14px;
}

.toc a {
  padding: 8px 0;
  border-top: 1px solid #edf2f7;
}

.toc a:first-of-type {
  border-top: 0;
}

.toc-links {
  display: grid;
}

.toc a:hover {
  color: var(--brand-dark);
}

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

.download-panel {
  scroll-margin-top: 108px;
}

.download-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  margin-top: 10px;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--blue));
  font-size: 13px;
  font-weight: 700;
}

.download-btn.secondary {
  color: #0f172a;
  border: 1px solid var(--line);
  background: #fff;
}

.content-area {
  min-width: 0;
}

.doc-shell {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.doc-toolbar {
  position: sticky;
  top: 76px;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
}

.doc-tabs {
  flex-wrap: wrap;
}

.tab-btn.active {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, var(--brand), var(--blue));
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.16);
}

.doc-meta {
  display: flex;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
}

.doc-panel {
  display: none;
  padding: 30px;
}

.doc-panel.active {
  display: block;
}

.markdown {
  min-width: 0;
}

.markdown h1,
.markdown h2,
.markdown h3,
.markdown h4 {
  color: var(--ink);
  line-height: 1.35;
  scroll-margin-top: 148px;
}

.markdown h1 {
  margin: 0 0 22px;
  font-size: 28px;
}

.markdown h2 {
  margin: 34px 0 14px;
  padding-top: 4px;
  font-size: 22px;
}

.markdown h3 {
  margin: 26px 0 12px;
  font-size: 18px;
}

.markdown h4 {
  margin: 22px 0 10px;
  font-size: 16px;
}

.markdown p,
.markdown li,
.markdown blockquote {
  color: #334155;
  font-size: 14px;
}

.markdown blockquote {
  margin: 16px 0;
  padding: 12px 16px;
  border-left: 4px solid var(--brand);
  border-radius: 0 10px 10px 0;
  background: #f1fbfa;
}

.markdown ul,
.markdown ol {
  padding-left: 22px;
}

.markdown table {
  width: 100%;
  margin: 14px 0 22px;
  border-collapse: collapse;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 13px;
}

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

.markdown th {
  color: #0f172a;
  background: #f8fafc;
}

.markdown code {
  padding: 2px 6px;
  border-radius: 6px;
  color: #0f3c3a;
  background: #edf7f5;
  font-family: Consolas, "SFMono-Regular", Menlo, monospace;
  font-size: 0.92em;
}

.markdown pre {
  position: relative;
  margin: 16px 0 22px;
  padding: 16px;
  border: 1px solid #1e293b;
  border-radius: 12px;
  background: #0f172a;
  overflow: auto;
}

.markdown pre code {
  padding: 0;
  color: #e2e8f0;
  background: transparent;
  font-size: 13px;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid rgba(226, 232, 240, 0.22);
  border-radius: 6px;
  color: #e2e8f0;
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 34px 28px 46px;
  color: var(--muted);
  font-size: 13px;
}

.site-footer img {
  width: 28px;
  height: 28px;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-wrap: wrap;
    padding: 16px 20px;
  }

  .nav-links {
    order: 3;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .layout {
    grid-template-columns: 1fr;
  }

  .side-panel {
    position: static;
  }

  .doc-toolbar {
    top: 0;
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .brand img {
    width: 116px;
  }

  .brand span,
  .doc-meta {
    display: none;
  }

  .nav-actions {
    width: 100%;
  }

  .nav-actions .primary-btn {
    flex: 1;
  }

  .layout {
    padding: 20px 18px 54px;
  }

  .doc-panel {
    padding: 20px 16px;
  }

  .markdown h1 {
    font-size: 24px;
  }

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