/* parallax 規則 — JS 透過 IntersectionObserver 給每個 .scene__bg 設 --y */
.scene__bg {
  transform: translate3d(0, var(--y, 0px), 0);
  transition: none;
}

/* a11y：使用者開了 reduced-motion → 完全不做 parallax 與 reveal 動畫 */
@media (prefers-reduced-motion: reduce) {
  .scene__bg {
    transform: none !important;
  }
  .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}