:root {
  --bg: #f6f7f9; --fg: #1b1f24; --muted: #5d6670; --line: #dde1e6; --link: #1a5fc8;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #121417; --fg: #e8eaed; --muted: #9aa0a6; --line: #30353b; --link: #8ab4f8; color-scheme: dark; }
}
* { 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; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
p, li { max-width: 68ch; }
ul { padding-left: 22px; }
a { color: var(--link); }
.meta { color: var(--muted); margin: 0 0 24px; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }