:root { color-scheme: light dark; --text: #1d1d1f; --muted: #6e6e73; --back: #ffffff; --accent: #0066cc; }
@media (prefers-color-scheme: dark) { :root { --text: #f5f5f7; --muted: #a1a1a6; --back: #000000; --accent: #4da3ff; } }
body { margin: 0; background: var(--back); color: var(--text); font: 17px/1.55 -apple-system, BlinkMacSystemFont, system-ui, sans-serif; }
main { max-width: 42rem; margin: 0 auto; padding: 3rem 1rem 4rem; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 1rem; }
h2 { font-size: 1.3rem; margin: 2.25rem 0 0.5rem; }
h3 { font-size: 1.05rem; margin: 1.5rem 0 0.25rem; }
a { color: var(--accent); }
li { margin: 0.35rem 0; }
.lead { color: var(--muted); }
.button { display: inline-block; margin: 1rem 0; padding: 0.8rem 1.6rem; border-radius: 999px; background: var(--accent); color: #ffffff; font-weight: 600; text-decoration: none; }