* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Inter', sans-serif;
    }

    body {
      background-color: #FFFFFF;
      color: var(--qizhi-dark);
      overflow-x: hidden;
      line-height: 1.6;
    }

     

    /* 通用动画 */
    @keyframes fadeUp {
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @keyframes fadeRight {
      to {
        opacity: 1;
        transform: translateX(0);
      }
    }

    @keyframes fadeIn {
      to {
        opacity: 1;
      }
    }

    .fade-in-element {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .fade-in-element.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* 英雄区样式 - 核心优化左右排列 */
    .hero { 
      display: flex;
      align-items: center;
      padding: 5rem 0;
      position: relative;
      overflow: hidden;
    }

    /* 优化Hero区域列间距和垂直居中 */
    .product_main .row {
        padding: 0 50px;
        margin : 50px;
      --bs-gutter-x: 2rem; 
      align-items: center;  
      height: 100%;  
    }

    .product_main .col-md-6 {
      padding-left: 1rem;
      padding-right: 1rem;
    }

    .hero-title {
      font-size: 3.5rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      opacity: 0;
      transform: translateY(20px);
      animation: fadeUp 0.8s ease forwards 0.3s;
    }

    .hero-title span {
      color: var(--qizhi-primary);
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--qizhi-gray);
      margin-bottom: 2rem;
      max-width: 500px;
      opacity: 0;
      transform: translateY(20px);
      animation: fadeUp 0.8s ease forwards 0.5s;
    }

    .hero-price {
      font-size: 2.5rem;
      font-weight: 600;
      color: var(--qizhi-primary);
      margin-bottom: 2rem;
      opacity: 0;
      transform: translateY(20px);
      animation: fadeUp 0.8s ease forwards 0.7s;
    }

    /* 图片切换区域核心样式 - 完整显示图片 */
    .product-img-container {
      opacity: 0;
      transform: translateX(30px);
      animation: fadeRight 0.8s ease forwards 0.9s;
      width: 100%;
      max-width: 500px; /* 限制图片区域最大宽度，避免大屏失衡 */
      margin: 0 auto; /* 图片区域在列中居中 */
    }

    /* 小屏下重置图片容器宽度 */
    @media (max-width: 767.98px) {
      .product-img-container {
        max-width: 100%;
        margin-top: 2rem;
      }
    }

    .main-img-wrapper {
      width: 100%;
      height: 400px;
      overflow: hidden;
      border-radius: 12px;
      box-shadow: 0 10px 30px rgba(0, 136, 210, 0.15);
      margin-bottom: 1.5rem;
      position: relative;
      background-color: var(--qizhi-bg); /* 图片容器背景，完整显示时补白 */
      display: flex;
      align-items: center;
      justify-content: center; /* 主图居中显示 */
    }

    .main-img {
      width: 100%;
      height: 100%;
      object-fit: contain; /* 完整显示图片，不裁剪 */
      object-position: center;
      position: absolute;
      top: 0;
      left: 0;
      opacity: 0;
      transition: opacity 0.5s ease;
    }

    .main-img.active {
      opacity: 1;
    }

    .thumbnails-wrapper {
      display: flex;
      gap: 1rem;
      justify-content: center;
      flex-wrap: wrap;
    }

    .thumbnail {
      width: 80px;
      height: 80px;
      border-radius: 8px;
      overflow: hidden;
      cursor: pointer;
      opacity: 0.6;
      border: 2px solid transparent;
      transition: var(--transition);
      background-color: var(--qizhi-bg); /* 缩略图容器背景 */
      display: flex;
      align-items: center;
      justify-content: center; /* 缩略图居中显示 */
    }

    .thumbnail img {
      width: 100%;
      height: 100%;
      object-fit: contain; /* 完整显示缩略图，不裁剪 */
      object-position: center;
    }

    .thumbnail:hover {
      opacity: 0.8;
      transform: scale(1.05);
    }

    .thumbnail.active {
      opacity: 1;
      border-color: var(--qizhi-primary);
      box-shadow: 0 0 0 2px rgba(0, 136, 210, 0.2);
    }

    /* 按钮通用样式 */
  

    .btn-outline-qizhi {
      background-color: transparent;
      color: var(--qizhi-primary);
      padding: 12px 30px;
      border-radius: 8px;
      font-weight: 600;
      border: 2px solid var(--qizhi-primary);
      transition: var(--transition);
      margin-left: 1rem;
      opacity: 0;
      transform: translateY(20px);
      animation: fadeUp 0.8s ease forwards 1s;
    }

    .btn-outline-qizhi:hover {
      background-color: var(--qizhi-primary);
      color: #FFFFFF;
      transform: translateY(-3px);
      box-shadow: 0 8px 20px rgba(0, 136, 210, 0.25);
    }

    /* 产品模块通用样式 */
    .product-section {
      padding: 8rem 0;
      background-color: var(--qizhi-light);
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 5rem;
      position: relative;
      opacity: 0;
      transform: translateY(20px);
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -15px;
      left: 50%;
      transform: translateX(-50%);
      width: 80px;
      height: 4px;
      background-color: var(--qizhi-primary);
      border-radius: 2px;
    }

    /* 切换按钮与内容区样式 */
    .toggle-container {
      max-width: 1400px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    .toggle-buttons {
      display: flex;
      justify-content: center;
      gap: 1rem;
      margin-bottom: 3rem;
      flex-wrap: wrap;
    }

    .toggle-btn {
      padding: 12px 36px;
      border-radius: 8px;
      font-weight: 600;
      border: 2px solid var(--qizhi-primary);
      background-color: transparent;
      color: var(--qizhi-primary);
      transition: var(--transition);
      cursor: pointer;
    }

    .toggle-btn.active {
      background-color: var(--qizhi-primary);
      color: #FFFFFF;
      box-shadow: 0 4px 12px rgba(0, 136, 210, 0.2);
    }

    .toggle-btn:hover:not(.active) {
      background-color: rgba(0, 136, 210, 0.05);
    }

    .toggle-content {
      background-color: #FFFFFF;
      border-radius: 12px;
      box-shadow: var(--shadow);
      padding: 3rem;
      opacity: 0;
      display: none;
      animation: fadeIn 0.5s ease forwards;
    }

    .toggle-content.active {
      display: block;
    }

    /* 产品描述样式 */
    .desc-content h3 {
      color: var(--qizhi-primary);
      font-size: 1.8rem;
      margin-bottom: 1.5rem;
      font-weight: 600;
    }

    .desc-content p {
      color: var(--qizhi-dark);
      font-size: 1.1rem;
      margin-bottom: 1.2rem;
      line-height: 1.8;
    }

    .desc-features {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 1.5rem;
      margin-top: 2rem;
    }

    .desc-feature-item {
      display: flex;
      align-items: flex-start;
      gap: 1rem;
    }

    .desc-feature-item i {
      color: var(--qizhi-primary);
      font-size: 1.5rem;
      margin-top: 0.3rem;
    }

    /* 规格表格样式 */
    .spec-table {
      width: 100%;
      border-collapse: collapse;
    }

    .spec-table th,
    .spec-table td {
      padding: 1.2rem 1.5rem;
      text-align: left;
      border-bottom: 1px solid var(--qizhi-border);
    }

    .spec-table th {
      background-color: var(--qizhi-light);
      color: var(--qizhi-primary);
      font-weight: 600;
      width: 30%;
    }

    .spec-table tr:last-child td {
      border-bottom: none;
    }

    .spec-table tr:hover td {
      background-color: rgba(0, 136, 210, 0.03);
    }

    /* 产品特性卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 2rem;
      margin-top: 3rem;
    }

    .feature-card {
      background-color: #FFFFFF;
      border-radius: 12px;
      padding: 2rem;
      box-shadow: var(--shadow);
      transition: var(--transition);
      opacity: 0;
      transform: translateY(30px);
    }

    .feature-card:hover {
      transform: translateY(-10px);
      box-shadow: 0 12px 32px rgba(0, 136, 210, 0.15);
    }

    .feature-card i {
      font-size: 2.5rem;
      color: var(--qizhi-primary);
      margin-bottom: 1.5rem;
      display: block;
    }

    .feature-card h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 1rem;
    }

    .feature-card p {
      color: var(--qizhi-gray);
      line-height: 1.7;
    }

 

    /* 响应式适配 */
    @media (max-width: 992px) {
      .product_main {
        height: auto;
        padding: 3rem 0;
        text-align: center;
      }

      .hero-title {
        font-size: 2.8rem;
      }

      .main-img-wrapper {
        height: 350px; /* 平板端主图高度微调 */
      }

      .toggle-content {
        padding: 2rem 1.5rem;
      }
    }

    @media (max-width: 576px) {
      .hero-title {
        font-size: 2.2rem;
      }

      .hero-price {
        font-size: 2rem;
      }

      .section-title {
        font-size: 2rem;
      }

      .toggle-btn {
        padding: 10px 24px;
        width: 100%;
        max-width: 250px;
      }

      .main-img-wrapper {
        height: 280px; /* 移动端主图高度微调 */
      }

      .thumbnail {
        width: 70px;
        height: 70px; /* 移动端缩略图尺寸微调 */
      }

      .spec-table th,
      .spec-table td {
        padding: 1rem;
        font-size: 0.9rem;
      }
    }