/* Reset + full-bleed canvas */
html, body {
  height: 100%;
  margin: 0;
}
body {
  background: #000;
  overflow: hidden; /* prevent scroll on mobile address bars */
}
#fg {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block; /* remove inline gap */
  touch-action: none;
  pointer-events: none; /* visual only */
}