.loading {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: transparent; /* ここを白(#ffffff)から透明に変更 */
  opacity: 0;
  pointer-events: none; /* 初期はクリックを透過 */
  transition: opacity 0.3s ease;
}

.loading.is-active {
  opacity: 1;
  pointer-events: auto; /* 表示中はクリックをブロック */
}

#transition-video {
  width: 100vw;
  height: 100vh;
  object-fit: cover;
}