:root{
  --bg:#87CEFA;
  --ui-bg: rgba(0,0,0,0.5);
  --text: #fff;
}

*{box-sizing:border-box;font-family:system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue",Arial;}

html,body{height:100%;margin:0;background:linear-gradient(#d3f1ff,#87CEFA);display:flex;flex-direction:column;align-items:center;}
#ui{z-index:10;text-align:center;margin-top:10px;color:var(--text);}
#controls{display:flex;gap:10px;align-items:center;justify-content:center;margin:6px;}
button{padding:8px 14px;border-radius:10px;border:none;background:#333;color:#fff;font-weight:600;cursor:pointer;}
button:active{transform:translateY(1px);}
#score{font-size:1.1rem;margin-left:8px;}
#hint{font-size:0.9rem;color:#111a; margin-top:6px}

canvas{display:block;margin:14px auto;border-radius:12px;box-shadow:0 8px 30px rgba(0,0,0,0.25);background:linear-gradient(#88c,#ffd);touch-action:none;}

#overlay{position:fixed;left:0;top:0;width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:rgba(0,0,0,0.4);z-index:50}
.hidden{display:none}
#gameOverBox{background:#fff;padding:20px 30px;border-radius:12px;box-shadow:0 8px 30px rgba(0,0,0,0.3);text-align:center}
#gameOverBox h2{margin:0 0 6px}
#gameOverBox p{margin:0 0 12px;font-weight:700}