:root{--bg:#fff;--fg:#172b4d;--muted:#5e6c84;--accent:#0052cc;--line:#dfe1e6}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#1d2125;--fg:#e6e9ee;--muted:#9fadbc;--accent:#579dff;--line:#38414a}}
:root[data-theme="dark"]{--bg:#1d2125;--fg:#e6e9ee;--muted:#9fadbc;--accent:#579dff;--line:#38414a}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
main{max-width:720px;margin:0 auto;padding:40px 16px}
h1{font-size:28px;margin:0 0 8px}h2{font-size:20px;margin:32px 0 8px}
p,li{color:var(--fg)}.muted{color:var(--muted)}a{color:var(--accent)}
nav a{margin-right:16px}hr{border:0;border-top:1px solid var(--line);margin:32px 0}