:root{--bg:#f7f8f6;--fg:#1c2420;--muted:#5b675f;--accent:#1f7a4d;--card:#fff;--line:#e3e7e4}
@media (prefers-color-scheme:dark){:root{--bg:#121714;--fg:#e6ece8;--muted:#9aa89f;--accent:#4cc38a;--card:#1a211d;--line:#2a332e}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
main{max-width:760px;margin:0 auto;padding:48px 16px 64px}
h1{font-size:2rem;margin:0 0 .25rem}h2{font-size:1.15rem;margin:2rem 0 .5rem}
.sub{color:var(--muted);margin:0 0 2rem}a{color:var(--accent)}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px 24px;margin:1rem 0}
ul{padding-left:1.2rem}footer{margin-top:3rem;padding-top:1rem;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}
nav a{margin-right:1rem}