:root{color-scheme:light dark;--fg:#1c1c1e;--muted:#6e6e73;--bg:#f5f5f7;--card:#fff;--accent:#0a84ff}
@media (prefers-color-scheme:dark){:root{--fg:#f5f5f7;--muted:#a1a1a6;--bg:#000;--card:#1c1c1e}}
*{box-sizing:border-box}body{margin:0;font:17px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--fg);background:var(--bg)}
main{max-width:720px;margin:0 auto;padding:40px 20px 64px}header{display:flex;align-items:center;gap:14px;margin-bottom:24px}
header img{width:56px;height:56px;border-radius:13px}header a{color:inherit;text-decoration:none;font-weight:700;font-size:22px}
nav{margin-left:auto;display:flex;gap:16px;font-size:15px}nav a{font-weight:500;font-size:15px;color:var(--accent)}
.card{background:var(--card);border-radius:16px;padding:24px 24px 12px;margin:16px 0}h1{font-size:34px;line-height:1.15;margin:8px 0 12px}
h2{font-size:21px;margin:24px 0 8px}p,li{color:var(--fg)}.muted{color:var(--muted);font-size:15px}a{color:var(--accent)}
footer{margin-top:40px;color:var(--muted);font-size:14px}