:root{--bg:#fafaf9;--fg:#1c1917;--muted:#57534e;--line:#e7e5e4;--accent:#1877f2;--card:#fff}@media (prefers-color-scheme:dark){:root{--bg:#0c0a09;--fg:#f5f5f4;--muted:#a8a29e;--line:#292524;--card:#1c1917}}*{box-sizing:border-box}body{background:var(--bg);color:var(--fg);margin:0;font:16px/1.55 system-ui,sans-serif}main{max-width:640px;margin:0 auto;padding:56px 16px 32px}h1{margin:0 0 12px;font-size:28px;line-height:1.2}h2{margin:32px 0 8px;font-size:18px}p,li{color:var(--muted)}ul{padding-left:20px}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;margin:24px 0;padding:20px}.button{background:var(--accent);color:#fff;border-radius:8px;padding:12px 20px;font-weight:600;text-decoration:none;display:inline-block}.error{color:#dc2626;border-color:#dc2626}footer{border-top:1px solid var(--line);gap:20px;max-width:640px;margin:0 auto;padding:24px 16px;font-size:14px;display:flex}footer a{color:var(--muted)}