:root {
  --blue: #1a73e8;
  --blue-dark: #1557b0;
  --green: #34a853;
  --bg: #f5f7fb;
  --text: #1f1f1f;
  --muted: #6b7280;
  --card: #fff;
  --radius: 14px;
  --shadow: 0 8px 32px rgba(26, 115, 232, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  background: linear-gradient(135deg, #1a73e8 0%, #4285f4 55%, #34a853 100%);
  color: #fff;
  padding: 48px 0 64px;
}

.site-header .logo-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.site-header .logo-img {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  object-fit: cover;
  flex-shrink: 0;
}

.site-header h1 { font-size: 2rem; font-weight: 700; }
.site-header .tagline {
  font-size: 1.05rem;
  opacity: 0.92;
  max-width: 640px;
  margin-top: 10px;
}

.nav-bar {
  background: var(--card);
  border-bottom: 1px solid #e8eaed;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-brand {
  font-weight: 700;
  color: var(--text);
  font-size: 15px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-brand img { width: 28px; height: 28px; border-radius: 6px; object-fit: cover; }

.nav-links {
  display: flex;
  gap: 24px;
  font-size: 14px;
}

.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--blue); text-decoration: none; }

/* Sections */
.section { padding: 48px 0; }
.section-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.feature-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  border: 1px solid #eef1f5;
}

.feature-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--blue);
}

.feature-card p { font-size: 14px; color: var(--muted); }

.download-box {
  background: var(--card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  text-align: center;
}

.download-box p { color: var(--muted); font-size: 14px; margin-top: 12px; }

.btn {
  display: inline-block;
  padding: 12px 28px;
  background: var(--blue);
  color: #fff;
  border-radius: 24px;
  font-weight: 600;
  font-size: 15px;
  border: none;
  cursor: pointer;
}
.btn:hover { background: var(--blue-dark); text-decoration: none; color: #fff; }

/* Legal pages */
.legal-page { padding: 40px 0 64px; }
.legal-page h1 { font-size: 1.75rem; margin-bottom: 8px; }
.legal-page .meta { color: var(--muted); font-size: 13px; margin-bottom: 32px; }
.legal-page h2 {
  font-size: 1.1rem;
  margin: 28px 0 12px;
  color: var(--blue-dark);
}
.legal-page p, .legal-page li {
  font-size: 14px;
  color: #374151;
  margin-bottom: 10px;
}
.legal-page ul { padding-left: 20px; margin-bottom: 16px; }

/* Docs page */
.docs-page h3 {
  font-size: 1rem;
  margin: 20px 0 10px;
  color: #374151;
  font-weight: 600;
}

.doc-toc {
  background: var(--card);
  border: 1px solid #eef1f5;
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 28px 0 36px;
  box-shadow: var(--shadow);
}

.doc-toc h2 {
  font-size: 14px;
  margin: 0 0 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.doc-toc ol {
  padding-left: 20px;
  margin: 0;
  columns: 2;
  column-gap: 32px;
}

.doc-toc li { margin-bottom: 6px; font-size: 14px; }
.doc-toc a { color: var(--blue); }

.doc-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 14px;
  background: var(--card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.doc-table th,
.doc-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid #eef1f5;
  vertical-align: top;
}

.doc-table th {
  background: #f8fafc;
  color: var(--blue-dark);
  font-weight: 600;
  font-size: 13px;
}

.doc-table tr:last-child td { border-bottom: none; }

.doc-table code {
  font-size: 12px;
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 4px;
}

.doc-cta {
  margin-top: 48px;
  padding: 32px;
  background: linear-gradient(135deg, #eff6ff 0%, #f0fdf4 100%);
  border-radius: var(--radius);
  text-align: center;
  border: 1px solid #dbeafe;
}

.doc-cta h2 {
  font-size: 1.25rem;
  margin: 0 0 10px;
  color: var(--text);
}

.doc-cta p {
  color: var(--muted);
  margin-bottom: 20px;
}

.btn-outline {
  background: transparent;
  color: var(--blue);
  border: 1.5px solid var(--blue);
  margin-left: 10px;
}

.btn-outline:hover {
  background: var(--blue);
  color: #fff;
}

@media (max-width: 640px) {
  .doc-toc ol { columns: 1; }
  .doc-table { font-size: 13px; }
  .doc-table th, .doc-table td { padding: 10px 12px; }
  .btn-outline { margin-left: 0; margin-top: 10px; display: inline-block; }
}

/* Footer */
.site-footer {
  background: #1f2937;
  color: #9ca3af;
  padding: 40px 0 28px;
  font-size: 13px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
  margin-bottom: 28px;
}

.footer-grid h4 { color: #e5e7eb; font-size: 14px; margin-bottom: 10px; }
.footer-grid a { color: #9ca3af; }
.footer-grid a:hover { color: #fff; }

.footer-bottom {
  border-top: 1px solid #374151;
  padding-top: 20px;
  text-align: center;
  font-size: 12px;
}

@media (max-width: 640px) {
  .site-header h1 { font-size: 1.5rem; }
  .nav-links { gap: 14px; font-size: 13px; }
}