:root {
  --bg: #ffffff;
  --text: #172b4d;
  --muted: #505f79;
  --line: #dfe1e6;
  --accent: #0c66e4;
  --panel: #f7f8f9;
  --max: 760px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1d2125;
    --text: #dee4ea;
    --muted: #9fadbc;
    --line: #38414a;
    --accent: #579dff;
    --panel: #22272b;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body {
  font-family: ui-sans-serif, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}
a { color: var(--accent); }
header, main, footer { max-width: var(--max); margin: 0 auto; padding: 0 16px; }
header { display: flex; justify-content: space-between; align-items: center; padding-top: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--line); flex-wrap: wrap; gap: 8px; }
header .brand { font-weight: 700; color: var(--text); text-decoration: none; }
header nav { display: flex; gap: 16px; flex-wrap: wrap; font-size: 15px; }
main { padding-top: 32px; padding-bottom: 48px; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 21px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 24px 0 6px; }
p.lead { font-size: 18px; color: var(--muted); margin-top: 0; }
.card { display: flex; gap: 16px; align-items: flex-start; border: 1px solid var(--line); border-radius: 8px; padding: 16px; margin: 16px 0; background: var(--panel); }
.card img { width: 48px; height: 48px; flex: none; }
.card h3 { margin: 0 0 4px; }
.card p { margin: 0; color: var(--muted); }
ul, ol { padding-left: 1.3em; }
li { margin: 4px 0; }
table { border-collapse: collapse; width: 100%; margin: 12px 0; font-size: 15px; }
th, td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; vertical-align: top; }
th { background: var(--panel); }
footer { border-top: 1px solid var(--line); padding-top: 16px; padding-bottom: 32px; color: var(--muted); font-size: 14px; }
.updated { color: var(--muted); font-size: 14px; }
.table-wrap { overflow-x: auto; }
.table-wrap table { min-width: 560px; }