:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a2b;
  --muted: #5a5a6e;
  --accent: #4f46e5;
  --card: #f6f6fa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12121a;
    --fg: #ececf4;
    --muted: #a0a0b4;
    --accent: #8b83ff;
    --card: #1d1d2a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.65;
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}
h1 { font-size: 1.9rem; margin-bottom: 0.25rem; }
h2 { font-size: 1.2rem; margin-top: 2rem; }
p, li { color: var(--muted); }
strong { color: var(--fg); }
a { color: var(--accent); }
.updated { color: var(--muted); font-size: 0.9rem; margin-top: 0; }
.card {
  background: var(--card);
  border-radius: 12px;
  padding: 16px 20px;
  margin: 16px 0;
}
footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 48px;
  color: var(--muted);
  font-size: 0.85rem;
}