:root { color-scheme: light dark; --ink: #1f3a5f; --bg: #fafaf7; --fg: #1d1d1f; --muted: #666; }
@media (prefers-color-scheme: dark) { :root { --ink: #8fb4ff; --bg: #121417; --fg: #ececec; --muted: #9a9a9a; } }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.55 -apple-system, system-ui, "Segoe UI", Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
h1, h2, h3 { color: var(--ink); line-height: 1.25; }
a { color: var(--ink); }
.muted { color: var(--muted); }
.lead { font-size: 1.1em; }
.icon { border-radius: 22%; }