:root{--bg:#f7f8fa;--fg:#14202b;--muted:#4f5d6b;--card:#fff;--line:#d9dee4;
--accent:#1d3f73}
@media (prefers-color-scheme:dark){:root{--bg:#0f161d;--fg:#e6edf3;--muted:#9fb0c0;--card:#17212b;
--line:#2a3846;--accent:#8db4f2}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.55 system-ui,-apple-system,
"Segoe UI",Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:24px 16px 48px}
h1{font-size:1.6rem;margin:.2em 0 .4em}
h2{font-size:1.15rem;margin:1.8em 0 .5em}
p,li{color:var(--fg)}
.muted{color:var(--muted)}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:14px 16px;
margin:12px 0}
code{font:0.95em ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--card);
border:1px solid var(--line);border-radius:6px;padding:1px 6px;overflow-wrap:anywhere}
a{color:var(--accent)}
ol,ul{padding-left:1.3em}