:root {
  --bg: #f7f7f8; --fg: #1d1d22; --muted: #5d5d6b; --card: #ffffff;
  --line: #e2e2e8; --accent: #d4202c;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #16161a; --fg: #e8e8ee; --muted: #a0a0ae; --card: #202026;
          --line: #2f2f38; --accent: #ff5a63; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.top, main, footer { max-width: 760px; margin: 0 auto; padding: 0 16px; }
.top { padding-top: 20px; font-weight: 600; }
.top a { color: var(--fg); text-decoration: none; }
main { padding-top: 12px; padding-bottom: 32px; }
h1 { font-size: 1.8rem; line-height: 1.25; margin: 16px 0 8px; }
h2 { font-size: 1.15rem; margin: 28px 0 6px; }
a { color: var(--accent); }
code { background: var(--line); padding: 1px 5px; border-radius: 4px; font-size: .9em;
  word-break: break-all; }
.lead { color: var(--muted); font-size: 1.05rem; }
.aside { margin-top: 32px; border-top: 1px solid var(--line); padding-top: 16px; }
.cards { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-top: 20px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  padding: 4px 20px 12px; }
footer { color: var(--muted); font-size: .9rem; padding-bottom: 32px;
  border-top: 1px solid var(--line); padding-top: 16px; }