/* 🔹影片全螢幕 */
  .intro-video {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
  }

  /* 🔹白色淡入遮罩 */
  .white-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    /*background: white;*/
    opacity: 0;
    z-index: 2;
    transition: opacity 1s ease-in-out;
  }

  /* 🔹LOGO與主內容容器 */
  .main-content {
    position: relative;
    z-index: 3;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    /*background: white;*/
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
  }