:root{--bg:#fff;--fg:#1c2530;--muted:#5b6673;--line:#e3e7ec;--accent:#2b5fd9}
@media (prefers-color-scheme:dark){:root{--bg:#14181d;--fg:#e6eaee;--muted:#9aa5b1;--line:#2a3038;--accent:#7aa2ff}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
main{max-width:42rem;margin:0 auto;padding:3rem 1rem 4rem}
h1{font-size:2rem;margin:0 0 .5rem}
h2{font-size:1.2rem;margin:2.2rem 0 .5rem}
p,li{color:var(--fg)}
.lead{color:var(--muted);font-size:1.1rem}
a{color:var(--accent)}
footer{margin-top:3rem;padding-top:1rem;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}