/* ✅ 固定底部导航栏 */
    .bottom-nav {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 60px;
      background-color: #333;
      display: flex;
      justify-content: space-around;
      align-items: center;
      z-index: 1000;
    }

    .bottom-nav a {
      color: white;
      text-decoration: none;
      text-align: center;
      font-size: 12px;
      flex: 1;
      padding: 10px 0;
    }

    .bottom-nav a:hover {
      background-color: #444;
    }