:root {
  --text: #1f1f1f;
  --muted: #5f6368;
  --accent: #0f6cbd;
  --bg: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root { --text: #e8eaed; --muted: #b0b3b8; --accent: #8ab4f8; --bg: #202124; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
.lead { font-size: 19px; color: var(--muted); margin-top: 0; }
.muted { color: var(--muted); }
a { color: var(--accent); }
li { margin-bottom: 6px; }