:root{
  --bg:#0b1220;
  --accent:#00ffd1;
  --panel: rgba(255,255,255,0.06);
}
*{box-sizing:border-box;margin:0;padding:0}
html,body,#gameCanvas{height:100%}
body{
  font-family:system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue",Arial;
  background: linear-gradient(180deg,#071022,#081028);
  display:flex;
  align-items:center;
  justify-content:center;
  height:100vh;
  overflow:hidden;
  -webkit-tap-highlight-color: transparent;
}
canvas{
  width:100%;
  height:100%;
  max-width:600px;
  max-height:1000px;
  background: linear-gradient(180deg,#071022,#0a1630);
  border-radius:12px;
  box-shadow: 0 10px 30px rgba(2,6,23,0.6);
}
#overlay{
  position:fixed;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  pointer-events:none;
}
#overlayContent{
  pointer-events:auto;
  background:var(--panel);
  padding:18px;
  border-radius:10px;
  text-align:center;
  color:#e6fff9;
  backdrop-filter: blur(6px);
}
#overlay.hidden{display:none}
#restartBtn{
  margin-top:10px;
  padding:10px 18px;
  border-radius:8px;
  border:none;
  background:var(--accent);
  color:#001213;
  font-weight:700;
  font-size:16px;
}
#restartBtn:active{transform:translateY(1px)}