:root{--ink:#1d2329;--muted:#55606b;--bg:#ffffff;--line:#e3e6ea;--accent:#1f5f8b}
@media (prefers-color-scheme:dark){:root{--ink:#e8ecef;--muted:#a9b3bc;--bg:#14181c;--line:#2a3138;--accent:#7cb8e4}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
.w{max-width:760px;margin:0 auto;padding:28px 16px 56px}
header{border-bottom:1px solid var(--line)}header .w{padding:18px 16px}
header b{font-size:19px}
h1{font-size:clamp(28px,6vw,38px);line-height:1.2;margin:8px 0 6px}
h2{font-size:20px;margin:30px 0 6px}
p,li{color:var(--ink)}.muted{color:var(--muted)}
a{color:var(--accent)}
footer{border-top:1px solid var(--line)}footer .w{padding:20px 16px;font-size:14px;color:var(--muted)}