html,body{margin:0;padding:0;background:#000;height:100%;overflow:hidden;font-family:system-ui,Arial,Helvetica,sans-serif;}
#game{display:block;width:100vw;height:100vh;background:#000;}
#overlay{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0.7);color:#fff;}
#overlay.hidden{display:none;}
.panel{background:#111;padding:24px 20px;border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,0.6);text-align:center;max-width:420px}
h1{margin:0 0 8px 0;font-size:28px}
p{opacity:.9;margin:0 0 16px 0}
button{appearance:none;border:none;background:#2ecc71;color:#111;padding:12px 18px;border-radius:10px;font-weight:700;font-size:16px}
.info{position:fixed;bottom:8px;left:8px;color:#fff;opacity:.7;font-size:12px}