:root{--bg:#F4F6FB;--card:#fff;--text:#0E1525;--muted:#6B7385;--accent:#1F6BFF;--border:#E1E6F0}
@media (prefers-color-scheme:dark){:root{--bg:#0B0F19;--card:#141A28;--text:#EEF2FA;--muted:#9AA3B5;--accent:#5B93FF;--border:#232B3D}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
main{max-width:720px;margin:0 auto;padding:32px 16px 64px}h1{font-size:30px;line-height:1.2;margin:8px 0 4px}h2{font-size:19px;margin:28px 0 6px}
.muted{color:var(--muted);font-size:14px}.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:20px 22px;margin-top:20px}
a{color:var(--accent)}nav a{margin-right:16px;font-weight:600;text-decoration:none}ul{padding-left:20px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px}.brand img{width:40px;height:40px;border-radius:10px}