:root{--bg:#f7f7fb;--surface:#fff;--text:#15161d;--muted:#646778;--border:#e3e4ec;--accent:#4f46e5;color-scheme:light}
@media (prefers-color-scheme:dark){:root{--bg:#0e0f14;--surface:#171821;--text:#ececf3;--muted:#9a9db0;--border:#2a2c3c;--accent:#a5a0ff;color-scheme:dark}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif}
header{border-bottom:1px solid var(--border);background:var(--surface)}header div{max-width:820px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;gap:10px;align-items:center;font-weight:800;font-size:19px;color:var(--text);text-decoration:none}.brand img{width:30px;height:30px}.brand span{color:var(--accent)}
main{max-width:820px;margin:0 auto;padding:36px 20px 80px}h1{font-size:34px;letter-spacing:-.02em;margin:0 0 6px}h2{font-size:20px;margin:34px 0 8px}
.muted{color:var(--muted)}a{color:var(--accent)}li{margin:4px 0}.box{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:16px 18px;margin:18px 0}
footer{color:var(--muted);font-size:14px;border-top:1px solid var(--border);margin-top:48px;padding-top:16px}