:root{--bg:#fff;--fg:#16121f;--muted:#5d576b;--accent:#6b3fd6;--line:#e6e2ee}
@media (prefers-color-scheme:dark){:root{--bg:#0f0c17;--fg:#f1eef8;--muted:#a7a0b8;--accent:#a98bff;--line:#2a2438}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
main{max-width:680px;margin:0 auto;padding:48px 16px 80px}
h1{font-size:40px;line-height:1.1;margin:0 0 8px;letter-spacing:-.02em}h2{font-size:20px;margin:40px 0 8px}
.sub{color:var(--muted);margin:0 0 32px}a{color:var(--accent)}
.card{border:1px solid var(--line);border-radius:14px;padding:20px;margin:24px 0}
details{border-top:1px solid var(--line);padding:14px 0}summary{cursor:pointer;font-weight:600}
footer{margin-top:56px;color:var(--muted);font-size:14px}