:root{--bg:#ffffff;--fg:#1b1f27;--muted:#5a6270;--accent:#1a5fd0;--line:#e3e6ec;--card:#f6f8fb}
@media (prefers-color-scheme:dark){:root{--bg:#0d1017;--fg:#e8ebf1;--muted:#a3abba;--accent:#7fb0ff;--line:#262c38;--card:#151a24}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--accent)}
a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
header,main,footer{max-width:46rem;margin:0 auto;padding:0 1.25rem}
header{padding-top:2rem}
.brand{font-weight:700;letter-spacing:.04em;font-size:1.1rem;color:var(--accent)}
h1{font-size:2rem;line-height:1.25;margin:.4rem 0 .6rem}
h2{font-size:1.2rem;margin:2.2rem 0 .5rem;padding-top:1.2rem;border-top:1px solid var(--line)}
h3{font-size:1rem;margin:1.1rem 0 .2rem}
.meta{color:var(--muted);margin:0 0 1.5rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:1rem 1.2rem;margin:1rem 0}
ul{padding-left:1.3rem}li{margin:.25rem 0}
nav ol{columns:2;column-gap:2rem;padding-left:1.3rem;margin:0}
@media (max-width:34rem){nav ol{columns:1}h1{font-size:1.6rem}}
footer{color:var(--muted);font-size:.9rem;padding-bottom:3rem;margin-top:2.5rem}