.timeline-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px; /* 最大宽度 */
      margin: 0 auto 60px;    /* 居中 */
      padding: 50px;
    }
    
    .timeline-content h2 {
      color: #048646;
      font-size: 2.5em;
      margin-bottom: 10px;
      font-weight:600;
    }
    .timeline-content ul {
      padding-left: 20px;
	  line-height:26px;
	  height:200px;
    }
    .timeline-nav {
      display: flex;
      gap: 10px;
      margin-top: 20px;
    }
    .timeline-nav button {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      border: none;
      font-size: 40px;
      cursor: pointer;
      color: white;
      margin-left:50px;
      line-height: 40px;
      padding: 0 0 18px 2px;
    }
    .timeline-nav .prev {
      background: #f08c32;
    }
    .timeline-nav .next {
      background: #048646;
    }

    /* 右侧年份部分 */
    .timeline-years {
      height: 21.5em; /* 显示13个年份，每行1.5em*/
      overflow: hidden;
      border-left: 4px solid #f08c32;
      padding-left: 20px;
      position: relative;
    }
    .timeline-years ul {
      list-style: none;
      padding: 0;
      margin: 0;
      transition: transform 0.3s ease-in-out;
    }
    .timeline-years li {
      font-size: 18px;
      line-height: 19em;
      color: #aaa;
      height: 1.5em;
    }
    .timeline-years li.active {
      color: #048646;
      font-weight: bold;
    }
    /* 中间高亮标记 */
    .timeline-years::after {
      content: "";
      position: absolute;
      left: -3px;
      top: 10.1em; /* 高亮在第3行 */
      width: 8px;
      height: 1em;
      background: #048646;
    }