:root{--bg:#fff;--fg:#1d1d1f;--muted:#6e6e73;--accent:#0a5cd6;--line:#e5e5ea}
@media(prefers-color-scheme:dark){:root{--bg:#111113;--fg:#f2f2f4;--muted:#9a9aa1;--accent:#6aa5ff;--line:#2a2a2e}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.55 -apple-system,system-ui,"Segoe UI",sans-serif}
a{color:var(--accent)}
header,main,footer{max-width:42rem;margin:0 auto;padding:0 1rem}
header{display:flex;justify-content:space-between;align-items:center;padding-top:1.25rem;padding-bottom:1.25rem;border-bottom:1px solid var(--line)}
header .brand{font-weight:700;font-size:1.15rem;color:var(--fg);text-decoration:none}
nav a{margin-left:1rem;text-decoration:none}
main{padding-top:2rem;padding-bottom:3rem}
h1{font-size:2rem;line-height:1.2;margin:0 0 .75rem}
h2{font-size:1.25rem;margin:2rem 0 .5rem}
.lead{font-size:1.2rem;color:var(--muted)}
.card{border:1px solid var(--line);border-radius:12px;padding:1rem 1.25rem;margin:1.25rem 0}
.card h2{margin-top:0}
footer{padding-top:1.5rem;padding-bottom:2rem;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}
footer a{color:var(--muted)}
header .brand img{display:block;height:4.5rem;width:auto}
header{flex-wrap:wrap;gap:.5rem}