html,body{margin:0;height:100%;background:#000;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:12px;font-family:monospace;}
#wrap{position:relative;}
canvas{width:960px;height:540px;image-rendering:pixelated;image-rendering:crisp-edges;background:#040704;}
#scan{position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(to bottom, rgba(0,0,0,.16) 0 1px, transparent 1px 3px);}
.hint{color:#9090A0;font-size:14px;}