:root {
  --bg: #ffffff;
  --fg: #17211d;
  --muted: #5f6b66;
  --accent: #087f5b;
  --line: #e3e8e5;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1412; --fg: #eef3f0; --muted: #a3b0aa; --accent: #2fbf8a; --line: #24302b; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 20px 64px; }
header { display: flex; align-items: center; gap: 12px; margin-bottom: 32px; }
header img { width: 44px; height: 44px; border-radius: 10px; }
header a { color: var(--fg); text-decoration: none; font-weight: 700; font-size: 20px; }
h1 { font-size: 34px; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); }
a { color: var(--accent); }
nav { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line); display: flex; gap: 20px; flex-wrap: wrap; font-size: 15px; }