:root{color-scheme:light dark;--bg:#f2f2f7;--card:#fff;--text:#1c1c1e;--muted:#6e6e73;--blue:#007aff}
@media (prefers-color-scheme:dark){:root{--bg:#000;--card:#1c1c1e;--text:#f5f5f7;--muted:#98989d;--blue:#0a84ff}}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 -apple-system,"Segoe UI",system-ui,sans-serif}
main{max-width:720px;margin:40px auto;padding:32px;background:var(--card);border-radius:18px}
@media(max-width:760px){main{margin:0;border-radius:0;padding:24px 20px}}
h1{font-size:1.9rem;letter-spacing:-.02em;margin:0 0 4px}h2{font-size:1.1rem;margin:28px 0 6px}
p,li{color:var(--text)}.meta{color:var(--muted);font-size:.9rem}a{color:var(--blue)}