:root{--bg:#fff;--fg:#1d1d1f;--muted:#5a5a63;--line:#e3e3e8;--link:#0b57d0}
@media (prefers-color-scheme:dark){:root{--bg:#141416;--fg:#ececf0;--muted:#a3a3ad;--line:#2c2c31;--link:#8ab4f8}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:40px 16px 64px}h1{font-size:1.8rem;margin:0 0 4px}h2{font-size:1.15rem;margin:32px 0 8px}
.sub{color:var(--muted);margin:0 0 24px}a{color:var(--link)}footer{border-top:1px solid var(--line);margin-top:40px;padding-top:16px;color:var(--muted);font-size:.9rem}
ul{padding-left:20px}