:root {
  --bg: #ffffff;
  --fg: #1c2330;
  --muted: #5b6577;
  --line: #dde2ea;
  --accent: #1f5fbf;
  --card: #f6f8fb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161d;
    --fg: #e6e9ef;
    --muted: #9aa5b8;
    --line: #2a3140;
    --accent: #7fb0ff;
    --card: #1a2029;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
header, main, footer {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1rem;
}
header { padding-top: 1.5rem; padding-bottom: 1rem; border-bottom: 1px solid var(--line); }
header a.brand { color: var(--fg); font-weight: 700; text-decoration: none; }
header nav { margin-top: 0.4rem; font-size: 0.95rem; }
header nav a { margin-right: 1rem; }
main { padding-top: 1.5rem; padding-bottom: 2rem; }
h1 { font-size: 1.8rem; line-height: 1.25; margin: 0 0 0.5rem; }
h2 { font-size: 1.25rem; margin: 2rem 0 0.5rem; }
a { color: var(--accent); }
.updated, .muted { color: var(--muted); font-size: 0.9rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.9rem 1.1rem;
  margin: 1rem 0;
}
.card h3 { margin: 0 0 0.25rem; font-size: 1.05rem; }
.card p { margin: 0.25rem 0; }
footer { padding-top: 1rem; padding-bottom: 2rem; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.9rem; }