html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: fixed;
  /* Prevent text selection on mobile */
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  /* Prevent pull-to-refresh and overscroll */
  overscroll-behavior: none;
  /* Ensure proper touch handling */
  touch-action: none;
}

canvas {
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  /* Prevent touch callouts on mobile */
  -webkit-touch-callout: none;
  /* Disable default touch behaviors */
  touch-action: none;
}