.slide-wrapper {
    position: relative;
    width: 100%;
    height: 680px;
    overflow: hidden;
  }

  .clip-mask {
    position: absolute;
    width: 180%;
    min-width:800px;
    height: 2000px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(45deg); /* 中央 + 回転 */
    clip-path: inset(100% 0% 0% 0%);
    transition: none;
    opacity: 0;
    z-index: 0;
  }

  .slide-bg {
    position: absolute;
    top: 50%;
    left: 50%;
    width: auto;
    height: 100%;
    min-height: 680px;
    aspect-ratio: 16 / 9; /* または希望の比率 */
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transform: translate(-50%, -50%) rotate(-45deg);
  }