:root {
  --fg: #0f172a;
  --muted: #475569;
  --bg: #ffffff;
  --card: #f8fafc;
  --border: #e2e8f0;
  --link: #1d4ed8;
  --link-hover: #1e40af;
  --max-w: 720px;
  --radius: 8px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e2e8f0;
    --muted: #94a3b8;
    --bg: #0f172a;
    --card: #1e293b;
    --border: #334155;
    --link: #60a5fa;
    --link-hover: #93c5fd;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 32px 20px 80px;
}
header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
  margin-bottom: 32px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
header .brand {
  font-weight: 600;
  font-size: 18px;
  color: var(--fg);
  text-decoration: none;
}
header nav { font-size: 14px; }
header nav a { margin-left: 16px; color: var(--muted); text-decoration: none; }
header nav a:hover { color: var(--link); }
h1 { font-size: 28px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 20px; line-height: 1.3; margin: 36px 0 12px; }
h3 { font-size: 17px; line-height: 1.4; margin: 24px 0 8px; }
p, ul, ol { margin: 0 0 12px; }
ul, ol { padding-left: 24px; }
li { margin-bottom: 6px; }
strong { color: var(--fg); }
a { color: var(--link); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--link-hover); }
code {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 0.92em;
}
.meta { color: var(--muted); font-size: 14px; margin-bottom: 16px; }
.callout {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin: 16px 0;
}
table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}
th, td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
th { background: var(--card); font-weight: 600; }
footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}