:root { --bg: #F2F2F4; --surf: #FFFFFF; --tx: #1B1C1F; --tx2: #5E6066; --link: #2E3034; --sep: #DCDDE0; color-scheme: light dark; }
@media (prefers-color-scheme: dark) { :root { --bg: #0F1012; --surf: #1A1B1E; --tx: #E6E7EA; --tx2: #A0A2A8; --link: #E6E7EA; --sep: #2A2B2F; } }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--tx); font: 17px/1.55 -apple-system, system-ui, "Segoe UI", sans-serif; }
main { max-width: 680px; margin: 0 auto; padding: 32px 16px 64px; }
h1 { font-size: 32px; line-height: 1.2; margin: 24px 0 8px; letter-spacing: -0.3px; }
h2 { font-size: 21px; margin: 32px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 4px; }
a { color: var(--link); text-underline-offset: 3px; }
.nav { font-size: 15px; color: var(--tx2); }
.muted { color: var(--tx2); font-size: 15px; }
.lead { font-size: 19px; }
hr { border: 0; border-top: 1px solid var(--sep); margin: 48px 0; }
ol { padding-left: 22px; }
li { margin: 6px 0; }
.cta { display: inline-block; margin: 8px 0 0; padding: 12px 22px; border-radius: 999px; background: var(--tx); color: var(--bg); font-weight: 600; text-decoration: none; }
.cta:hover { opacity: 0.9; }