:root {
  color-scheme: light dark;
  --fg: #1b1d21;
  --muted: #4a5160;
  --bg: #ffffff;
  --accent: #0057b7;
  --border: #d9dde4;
}
@media (prefers-color-scheme: dark) {
  :root { --fg: #eceff4; --muted: #b8c0cc; --bg: #121417; --accent: #7fb4ff; --border: #2c313a; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
}
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header { padding-top: 28px; }
header a.brand { font-weight: 700; font-size: 1.25rem; color: var(--fg); text-decoration: none; }
nav { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 16px; }
a { color: var(--accent); }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 28px 0 8px; }
h2 { font-size: 1.3rem; margin: 28px 0 8px; }
p.meta, footer { color: var(--muted); }
footer { margin-top: 48px; padding-bottom: 32px; border-top: 1px solid var(--border); padding-top: 16px; font-size: 0.95rem; }
ul, ol { padding-left: 1.3em; }