:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --primary: #0066cc;
  --primary-bg: #d7e6fb;
  --border: #e5e7eb;
  --accent: #f3f4f6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --fg: #f1f5f9;
    --muted: #94a3b8;
    --primary: #7ab6f2;
    --primary-bg: #1a3a5c;
    --border: #1e293b;
    --accent: #1e293b;
  }
}
* { box-sizing: border-box; }
html, body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.65;
  margin: 0;
  padding: 0;
}
body { padding: 32px 16px 64px; }
.container { max-width: 720px; margin: 0 auto; }
header.brand { display: flex; align-items: center; gap: 12px; margin-bottom: 32px; }
header.brand .logo { width: 40px; height: 40px; border-radius: 10px; background: var(--primary); color: #fff; display: grid; place-items: center; font-weight: 700; }
header.brand h1 { font-size: 22px; margin: 0; }
header.brand .tagline { color: var(--muted); font-size: 14px; }
h1.page-title { font-size: 28px; margin: 0 0 8px; }
h2 { font-size: 19px; margin: 28px 0 10px; }
p { margin: 0 0 14px; }
strong { color: var(--fg); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--muted); font-size: 14px; }
.lang-switch { display: flex; gap: 8px; margin-bottom: 24px; }
.lang-switch a {
  padding: 6px 14px; border: 1px solid var(--border); border-radius: 999px;
  font-size: 14px; color: var(--fg);
}
.lang-switch a.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.lang-switch a:hover { text-decoration: none; }
hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }
nav.docs-nav { display: grid; gap: 8px; margin-bottom: 16px; }
nav.docs-nav a {
  padding: 14px 16px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--accent);
  display: flex; align-items: center; justify-content: space-between;
  font-weight: 500;
}
nav.docs-nav a:hover { background: var(--primary-bg); border-color: var(--primary); }
nav.docs-nav a::after { content: '→'; color: var(--muted); font-weight: 400; }
.intro { color: var(--muted); margin-bottom: 32px; }
.section-grid { display: grid; grid-template-columns: 1fr; gap: 24px; margin-top: 24px; }
@media (min-width: 640px) { .section-grid { grid-template-columns: 1fr 1fr; } }
.section-grid h2 { margin-top: 0; }
footer {
  margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 13px; text-align: center;
}
footer a { color: var(--muted); }