/* canvas.css */
#floatingCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  background-color: transparent;
  pointer-events: auto;
}

#gameCanvas {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 320px;  /* 8 клеток по 40px */
  height: 320px;
  border: 2px solid #3390ec; 
  background: #18222d;
  box-shadow: 0 0 10px #3390ec44;
  z-index: 1;
  touch-action: none;
}