.arcade-back {
  position: fixed;
  top: max(8px, env(safe-area-inset-top));
  left: 10px;
  z-index: 10000;
  background: rgba(0, 0, 0, 0.7);
  color: #fff;
  text-decoration: none;
  font: 700 13px/1 system-ui, -apple-system, sans-serif;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  backdrop-filter: blur(8px);
}
.arcade-back:active {
  transform: scale(0.96);
}