:root{--bg:#f6f8f8;--fg:#14211f;--muted:#56706b;--accent:#1a8580;--card:#fff;--line:#dbe5e3}
@media (prefers-color-scheme:dark){:root{--bg:#0f1716;--fg:#e3eeec;--muted:#93aba6;--accent:#3cc2b5;--card:#16211f;--line:#2a3a37}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
main{max-width:44rem;margin:0 auto;padding:2.5rem 16px 4rem}
h1{font-size:1.9rem;line-height:1.2;margin:0 0 .4rem}
h2{font-size:1.15rem;margin:2rem 0 .5rem}
p,li{max-width:65ch}
.muted{color:var(--muted);font-size:.9rem}
a{color:var(--accent)}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1rem 1.2rem;margin:1rem 0}
nav{font-size:.9rem;margin-bottom:2rem}
nav a{margin-right:1rem}
.lead{font-size:1.15rem}
footer{margin-top:3rem;border-top:1px solid var(--line);padding-top:1rem}