:root{color-scheme:light dark;--bg:#f6f7f9;--fg:#171c26;--muted:#586073;--line:#d9dde5;--link:#2c5bd8}
@media (prefers-color-scheme:dark){:root{--bg:#0f1420;--fg:#e8ecf4;--muted:#9aa4b8;--line:#232b3d;--link:#7da2ff}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 -apple-system,BlinkMacSystemFont,"Helvetica Neue",sans-serif}
main{max-width:38rem;margin:0 auto;padding:3rem 1.25rem 4rem}
h1{font-size:1.9rem;line-height:1.2;margin:0 0 .5rem;letter-spacing:-.01em}
h2{font-size:1.15rem;margin:2.2rem 0 .4rem}
p,ul{margin:.6rem 0}
ul{padding-left:1.2rem}
li{margin:.25rem 0}
a{color:var(--link)}
.lead{color:var(--muted);font-size:1.05rem}
footer{margin-top:3rem;padding-top:1rem;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}