:root{--bg:#ffffff;--fg:#1c1c1e;--muted:#5d5d63;--accent:#0f5f8f;--line:#e4e4e8;--card:#f6f6f8}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#111214;--fg:#ececef;--muted:#a3a3ab;--accent:#7cc0ea;--line:#2a2b30;--card:#1a1b1f}}
:root[data-theme="dark"]{--bg:#111214;--fg:#ececef;--muted:#a3a3ab;--accent:#7cc0ea;--line:#2a2b30;--card:#1a1b1f}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
header,main,footer{max-width:760px;margin:0 auto;padding:0 16px}
header{padding-top:28px;display:flex;gap:16px;align-items:baseline;flex-wrap:wrap}
header a{color:var(--fg);text-decoration:none;font-weight:700;font-size:20px}
header nav a{font-weight:500;font-size:15px;color:var(--muted);margin-right:14px}
header nav a:hover{color:var(--accent)}
main{padding:24px 16px 48px}
h1{font-size:30px;line-height:1.2;margin:16px 0 8px}
h2{font-size:21px;margin:32px 0 8px}
p,li{max-width:66ch}
.lede{color:var(--muted);font-size:17px}
a{color:var(--accent)}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px 18px;margin:16px 0}
.card p:last-child{margin-bottom:0}
dl{display:grid;grid-template-columns:max-content 1fr;gap:6px 18px}
dt{color:var(--muted)}
footer{border-top:1px solid var(--line);padding:20px 16px 40px;color:var(--muted);font-size:14px}
footer a{color:var(--muted)}
@media (max-width:480px){dl{grid-template-columns:1fr}dt{margin-top:8px}}