body {
        margin: 0;
        padding: 0;
        background-color: #1a1a1a;
        overflow: hidden;
        font-family: "Helvetica Neue", Arial, sans-serif;
        height: 100vh;
        display: flex;
        align-items: flex-end;
        justify-content: center;
      }

      .slider-container {
        position: relative;
        width: 100%;
        height: 100%;
        display: flex;
        justify-content: center;
        align-items: center;
        overflow: hidden;
        cursor: grab; /* 全体がドラッグ可能領域 */
      }
      .slider-container:active {
        cursor: grabbing;
      }

      .wheel {
        position: relative;
        width: 0;
        height: 0;
        top: 40%;
        /* 親要素自体は回転させず、基準点として使う */
      }

      .card {
        position: absolute;
        width: 240px;
        height: 320px;
        left: -120px;
        top: -160px;
        border-radius: 12px;
        background-color: #fff;
        overflow: hidden;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
        border: 4px solid #fff;

        /* 回転軸（円の半径） */
        transform-origin: 50% 1500px;

        will-change: transform, opacity;
        user-select: none;
      }

      .card img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        pointer-events: none;
      }