body {
  margin: 0;
  background: #000;
  overflow: hidden;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: #050505;
  touch-action: none;
}

#ui-center {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: auto;
}

button {
  padding: 10px 16px;
  font-size: 14px;
  background: rgba(10,10,10,0.9);
  color: #eee;
  border: 1px solid #666;
  border-radius: 999px;
  box-shadow: 0 0 12px rgba(0,0,0,0.8);
}

button:active {
  transform: translateY(1px);
}