.page-title {
      text-align: center;
      margin-bottom: 80px;
    }
    .page-title h2 {
      font-size: 36px;
      color: #111827;
      letter-spacing: 2px;
      margin-bottom: 12px;
    }
    .page-title span {
      display: inline-block;
      width: 80px;
      height: 3px;
      background: linear-gradient(90deg, #3b82f6, #8b5cf6);
      border-radius: 3px;
    }
    /* 时间轴外层容器 */
    .timeline-box {
      position: relative;
      padding-left: 55px;
    }
    /* 底层灰色基准竖线 */
    .timeline-box::before {
      content: "";
      position: absolute;
      left: 0;
      top: 0;
      width: 4px;
      height: 100%;
      background: #e5e7eb;
      border-radius: 4px;
    }
    /* 滚动填充渐变进度线 动态增长 */
    .timeline-progress {
      position: absolute;
      left: 0;
      top: 0;
      width: 4px;
      height: 0%;
      background: linear-gradient(180deg, #3b82f6, #8b5cf6);
      border-radius: 4px;
      transition: height 0.3s linear;
      z-index: 1;
    }
    /* 单个时间节点 */
    .timeline-item {
      position: relative;
      margin-bottom: 65px;
      opacity: 0;
      transform: translateY(60px);
      transition: all 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    }
    /* 动画激活 */
    .timeline-item.show {
      opacity: 1;
      transform: translateY(0);
    }
    /* 延迟出场 错落动画更高级 */
    .timeline-item:nth-child(1) { transition-delay: 0s; }
    .timeline-item:nth-child(2) { transition-delay: 0.12s; }
    .timeline-item:nth-child(3) { transition-delay: 0.24s; }
    .timeline-item:nth-child(4) { transition-delay: 0.36s; }
    .timeline-item:nth-child(5) { transition-delay: 0.48s; }
    .timeline-item:nth-child(6) { transition-delay: 0.6s; }
    /* 发光圆点 */
    .timeline-dot {
      position: absolute;
      left: -63px;
      top: 6px;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: linear-gradient(135deg, #3b82f6, #8b5cf6);
      box-shadow: 0 0 0 4px #fff, 0 0 15px rgba(59, 130, 246, 0.45);
      z-index: 2;
    }
    /* 年份悬浮标签 */
    .year-tag {
      display: inline-block;
      padding: 6px 16px;
      background: linear-gradient(135deg, #3b82f6, #8b5cf6);
      color: #fff;
      font-size: 18px;
      font-weight: 600;
      border-radius: 30px;
      margin-bottom: 16px;
      box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
    }
    /* 事件卡片 立体质感 */
    .event-card {
      background: #fff;
      padding: 28px 32px;
      border-radius: 16px;
      box-shadow: 0 8px 30px rgba(30, 40, 60, 0.08);
      border: 1px solid rgba(230, 232, 238, 0.6);
      transition: all 0.3s ease;
    }
    /* 卡片hover上浮微动效 */
    .event-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 14px 40px rgba(59, 130, 246, 0.15);
    }
    .event-card h4 {
      font-size: 20px;
      color: #1f2937;
      margin-bottom: 10px;
    }
    .event-card p {
      font-size: 15px;
      color: #6b7280;
      line-height: 1.8;
    }
    /* 底部留白 */
    /* .blank-space {
      height: 400px;
    } */
    /* 移动端适配 */
    @media screen and (max-width: 640px) {
      .page-title h2 {
        font-size: 28px;
      }
      .timeline-box {
        padding-left: 42px;
      }
      .timeline-dot {
        left: -49px;
        width: 16px;
        height: 16px;
      }
      .event-card {
        padding: 20px 22px;
      }
      .year-tag {
        font-size: 16px;
      }
      .timeline-item {
        margin-bottom: 50px;
      }
    }