@font-face {
      font-family: 'Manrope SemiBold';
      src: url('manrope-extrabold-3.otf') format('opentype');
      font-weight: 600;
      font-style: normal;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      user-select: none;
    }

    html, body {
      overflow-x: hidden;
      width: 100%;
    }

    .stage {
      position: relative;
      margin-top:-150px;
      width: 100vw;
      min-height: 100vh;
      background-color: #f0f2f5;
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    }

    .bg-image {
      display: block;
      width: 100%;
      height: auto;
      object-fit: cover;
      pointer-events: none;
    }

    .content-wrapper {
      position: absolute;
      left: 5%;
      right: 8%;
      top: 30%;
      bottom: 20%;
      display: flex;
      flex-direction: column;
      background: transparent;
      pointer-events: none;
    }

    /* 整体滑动区域 */
    .slider-pair {
      width: 100%;
      height: 100%;
      overflow: hidden;
      cursor: grab;
      pointer-events: auto;
      position: relative;
      background: transparent;
    }
    .slider-pair:active {
      cursor: grabbing;
    }

    .slides-container {
      display: flex;
      width: 100%;
      height: 100%;
      transition: transform 0.4s cubic-bezier(0.2, 0.9, 0.3, 1);
      will-change: transform;
    }

    .slide {
      flex: 0 0 101%;
      display: flex;
      gap: 4%;
      height: 100%;
      background: transparent;
      pointer-events: none;
    }

    .slide-left {
      flex: 0 0 49%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      align-self: flex-start;
      background: #e0e4e8;
      pointer-events: auto;
    }
    .slide-left img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .slide-content {
      flex: 1 1 auto;
      height: 100%;
      padding: 6% 0 0 2%;
      position: relative;
      overflow: visible;
      pointer-events: none;
    }

    .company-title-bg {
      position: relative;
      display: inline-block;
      z-index: 1;
    }

    .dynamic-bg-year {
      position: absolute;
      top: -188%;
      left: 0;
      transform: translateY(-30%);
      font-size: 6rem;
      font-weight: 800;
      line-height: 1;
      white-space: nowrap;
      background: linear-gradient(to bottom, rgba(234, 232, 233, 1) 0%, rgba(254, 254, 254, 0.2) 100%);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      z-index: 0;
      pointer-events: none;
      letter-spacing: 4px;
      opacity: 0.9;
      font-family: 'Manrope SemiBold', sans-serif;
    }

    .section-title {
      font-size: 0.9rem;
      letter-spacing: 2px;
      text-transform: uppercase;
      color: #898989;
      font-weight: 400;
      margin-bottom: 0.3rem;
      position: relative;
      z-index: 2;
    }

    .desc-text {
      font-size: clamp(1rem, 2vh, 1.2rem);
      line-height: 1.6;
      color: #464646;
      font-weight: 600;
      margin-bottom: 1.2rem;
      max-width: 90%;
      text-shadow: 0 1px 3px rgba(255,255,255,0.5);
    }
    .tech-desc {
      margin-bottom: 1.5rem;
    }

    /* 按钮容器 */
    .nav-buttons {
      position: absolute;
      bottom: 20%;
      right: 15%;
      display: flex;
      gap: 2rem;
      z-index: 20;
      pointer-events: auto;
    }

    .nav-btn {
      width: 2.5rem;
      height: 2.5rem;
      border: none;
      cursor: pointer;
      background: #0252DB;
      backdrop-filter: blur(4px);
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background 0.2s ease, transform 0.2s ease;
      font-size: 2rem;
      color: white;
      line-height: 1;
      position: relative;
    }
    
    /* 左按钮：背景横线 + 双箭头 */
    .nav-btn.left {
      background-image: linear-gradient(to left, #fff, #fff);
      background-size: 18px 1px;
      background-position: 12px center;
      background-repeat: no-repeat;
    }
    .nav-btn.left::before,
    .nav-btn.left::after {
      content: '';
      position: absolute;
      left: 9px;
      top: 50%;
      width: 14px;
      height: 1px;
      background: #fff;
      transform-origin: left center;
      transition: transform 0.2s ease, left 0.2s ease, background 0.2s;
    }
    .nav-btn.left::before {
      transform: translateY(-50%) rotate(-45deg);
    }
    .nav-btn.left::after {
      transform: translateY(-50%) rotate(45deg);
    }
    /* 右按钮 */
    .nav-btn.right {
      background-image: linear-gradient(to right, #fff, #fff);
      background-size: 18px 1px;
      background-position: 12px center;
      background-repeat: no-repeat;
    }
    .nav-btn.right::before,
    .nav-btn.right::after {
      content: '';
      position: absolute;
      right: 8px;
      top: 50%;
      width: 14px;
      height: 1px;
      background: #fff;
      transform-origin: right center;
      transition: transform 0.2s ease, right 0.2s ease, background 0.2s;
    }
    .nav-btn.right::before {
      transform: translateY(-50%) rotate(-45deg);
    }
    .nav-btn.right::after {
      transform: translateY(-50%) rotate(45deg);
    }

    /* hover 效果：背景加深 + 箭头微移 */
    .nav-btn.left:hover {
      background-color: #003bb3;
    }
    .nav-btn.left:hover::before,
    .nav-btn.left:hover::after {
      left: 6px;
    }

    .nav-btn.right:hover {
      background-color: #003bb3;
    }
    .nav-btn.right:hover::before,
    .nav-btn.right:hover::after {
      right: 5px;
    }

    .nav-btn:disabled {
      background: #d9d9d9;
      cursor: not-allowed;
      pointer-events: none;
      background-image: linear-gradient(to left, #fff, #fff);
      background-size: 18px 1px;
      background-position: 12px center;
      background-repeat: no-repeat;
    }

    .timeline {
      position: absolute;
      bottom: 2%;
      left: 50%;
      transform: translateX(-50%);
      width: 80%;
      max-width: 1550px;
      height: 90px;
      overflow: hidden;
      background: transparent;
      pointer-events: auto;
      z-index: 15;
    }

    .timeline-line {
      position: absolute;
      top: 40px;
      left: 0;
      width: 100%;
      height: 1px;
      background: linear-gradient(to right, transparent 0%, #c0c0c0 20%, #a0a0a0 50%, #c0c0c0 80%, transparent 100%);
      border-radius: 4px;
      opacity: 0.6;
      z-index: 1;
    }

    .timeline-items {
      position: absolute;
      top: 0;
      right: 0;
      display: flex;
      gap: 0;
      padding: 0;
      transform: translateX(0px);
      transition: transform 0.4s cubic-bezier(0.2, 0.9, 0.3, 1);
      z-index: 2;
      will-change: transform;
      cursor: pointer;
      pointer-events: auto;
    }

    .timeline-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 80px;
      flex-shrink: 0;
      text-align: center;
      cursor: pointer;
      margin-right: 20px;
      pointer-events: auto;
    }
    .timeline-item:last-child {
      margin-right: 0;
    }

    .dot {
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background-color: #898989;
      margin-bottom: 12px;
      transition: background-color 0.3s, transform 0.2s;
      transform: translateY(32px);
    }

    .year {
      font-size: 1rem;
      font-weight: 500;
      color: #898989;
      transition: color 0.3s;
      margin-top: 24px;
    }

    .timeline-item.active .dot {
      background-color: #0252DB;width: 18px;height: 18px;
    }
    .timeline-item.active .year {
      color: #0252DB;
      font-weight: 700;
    }

    @media (max-width: 1000px) {
      .content-wrapper {
        left: 5%;
        right: 5%;
        top: 12%;
        bottom: 22%;
      }
      .desc-text {
        font-size: 0.9rem;
      }
      .nav-buttons {
        bottom: 10%;
        right: 8%;
      }
    }
    @media (min-width: 1400px) {
          .stage { margin-top:-260px;}
      .content-wrapper{top: 33%;}
      .dynamic-bg-year{top: -308%;font-size: 8rem;}
      .nav-buttons{right: 18%;}
	  .timeline-item{width:120px;}
	  
	  .nav-btn{width: 3.2rem; height: 3.2rem;}
	  .nav-btn.left{ background-size: 26px 1px;}
	  .nav-btn.right{ background-size: 26px 1px;}
	  .nav-btn.left::before, .nav-btn.left::after{width: 20px;}
	  .nav-btn.right::before, .nav-btn.right::after{width: 20px;}
    }
    @media (max-width: 700px) {
      .slide {
        flex-direction: column;
        gap: 10px;
      }
      .slide-left {
        flex: 0 0 auto;
        width: 100%;
        aspect-ratio: 16/9;
      }
      .slide-content {
        padding: 2% 0 0 0;
      }
      .nav-buttons {
        bottom: 8%;
        right: 5%;
      }
    }