:root { --bg: #ffffff; --fg: #1a1a1a; --muted: #5f6368; --rule: #e3e3e3; --link: #1a5fb4; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #161616; --fg: #e8e8e8; --muted: #a0a0a0; --rule: #333333; --link: #8ab4f8; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; }
h1 { font-size: 28px; margin: 0 0 8px; letter-spacing: -0.01em; }
h2 { font-size: 18px; margin: 32px 0 8px; }
p, li { color: var(--fg); }
.lede { color: var(--muted); margin: 0 0 24px; }
a { color: var(--link); }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--rule); color: var(--muted); font-size: 14px; }