:root{--bg:#fff;--fg:#14213d;--muted:#51607a;--accent:#1e52a0;--line:#e3e8f0}
@media (prefers-color-scheme:dark){:root{--bg:#0f172a;--fg:#e8edf7;--muted:#a3b0c7;--accent:#7fb0ff;--line:#26324a}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
main{max-width:42rem;margin:0 auto;padding:2.5rem 1rem 4rem}
h1{font-size:2rem;line-height:1.2;margin:0 0 .25rem}
h2{font-size:1.2rem;margin:2rem 0 .4rem}
p,li{margin:.5rem 0}
.muted{color:var(--muted);font-size:.95rem}
a{color:var(--accent)}
nav{display:flex;gap:1.25rem;flex-wrap:wrap;border-top:1px solid var(--line);margin-top:3rem;padding-top:1rem;font-size:.95rem}