:root {
      --primary-color: #0d59f2;
      --primary-light: #eef4ff;
      --accent-color: #00b4d8;
      --text-main: #1d2939;
      --text-sub: #475467;
      --text-light: #98a2b3;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e4e7ec;
      --brand-gradient: linear-gradient(135deg, #0d59f2 0%, #00b4d8 100%);
      --card-shadow: 0 4px 20px rgba(13, 89, 242, 0.06);
      --card-hover-shadow: 0 12px 30px rgba(13, 89, 242, 0.12);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    img {
      display: block;
      max-width: 100%;
      height: auto;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
    }

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-sub);
      transition: var(--transition);
      border-radius: 6px;
    }

    .nav-links li a:hover {
      color: var(--primary-color);
      background: var(--primary-light);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: var(--brand-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(13, 89, 242, 0.25);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(13, 89, 242, 0.35);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary-color);
      border-color: var(--primary-color);
    }

    .btn-outline:hover {
      background: var(--primary-light);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 8px;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 70px 0 60px;
      background: linear-gradient(180deg, #ffffff 0%, var(--bg-page) 100%);
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: var(--primary-light);
      border: 1px solid rgba(13, 89, 242, 0.15);
      border-radius: 50px;
      color: var(--primary-color);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

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

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-sub);
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-btns {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-cta-btn {
      padding: 14px 34px;
      font-size: 1.05rem;
    }

    .stats-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 24px;
      box-shadow: var(--card-shadow);
      margin-top: 20px;
    }

    .stat-item {
      text-align: center;
      border-right: 1px solid var(--border-color);
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-num {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary-color);
      line-height: 1.2;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-sub);
      margin-top: 4px;
    }

    /* 通用分块样式 */
    .section-wrap {
      padding: 70px 0;
    }

    .section-white {
      background: #ffffff;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary-color);
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 平台介绍 */
    .platform-features {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(13, 89, 242, 0.3);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
      font-weight: bold;
    }

    .feature-title {
      font-size: 1.18rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .feature-desc {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 服务能力卡片网格 */
    .grid-cards {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
      gap: 20px;
    }

    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 22px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

    .service-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--card-hover-shadow);
    }

    .service-badge {
      display: inline-block;
      font-size: 0.75rem;
      padding: 3px 8px;
      background: var(--primary-light);
      color: var(--primary-color);
      border-radius: 4px;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .service-name {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .service-detail {
      font-size: 0.88rem;
      color: var(--text-sub);
      line-height: 1.5;
    }

    /* 行业模型标签墙 */
    .model-tags-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 28px;
      margin-top: 30px;
    }

    .model-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-tag {
      background: var(--bg-page);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 500;
      color: var(--text-main);
      transition: var(--transition);
    }

    .model-tag:hover {
      background: var(--primary-light);
      color: var(--primary-color);
      border-color: var(--primary-color);
    }

    /* 流程步骤 */
    .workflow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px;
      position: relative;
      box-shadow: var(--card-shadow);
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--brand-gradient);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
      margin-bottom: 16px;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .step-desc {
      font-size: 0.88rem;
      color: var(--text-sub);
    }

    /* 对比评测表格 */
    .compare-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 30px;
      box-shadow: var(--card-shadow);
    }

    .rating-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 24px;
    }

    .rating-score-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-big {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary-color);
      line-height: 1;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 1.2rem;
      margin-bottom: 4px;
    }

    .rating-meta {
      font-size: 0.9rem;
      color: var(--text-sub);
    }

    .table-responsive {
      overflow-x: auto;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }

    .compare-table th {
      background: var(--bg-page);
      font-weight: 700;
      color: var(--text-main);
    }

    .compare-table tr:hover td {
      background: rgba(13, 89, 242, 0.02);
    }

    .highlight-cell {
      color: var(--primary-color);
      font-weight: 600;
    }

    /* 案例展示 */
    .case-gallery {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
    }

    .case-main-item, .case-side-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }

    .case-media-box {
      width: 100%;
      overflow: hidden;
      background: #eaecf0;
    }

    .case-info {
      padding: 20px;
    }

    .case-info h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .case-info p {
      font-size: 0.9rem;
      color: var(--text-sub);
    }

    /* 用户评论 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: normal;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f2f4f7;
      padding-top: 12px;
    }

    .reviewer-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }

    .reviewer-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .reviewer-info p {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }

    .faq-question {
      padding: 18px 20px;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
      transition: var(--transition);
    }

    .faq-question:hover {
      background: var(--primary-light);
      color: var(--primary-color);
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
      color: var(--primary-color);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #ffffff;
    }

    .faq-answer-inner {
      padding: 0 20px 18px;
      font-size: 0.9rem;
      color: var(--text-sub);
      line-height: 1.6;
      border-top: 1px dashed var(--border-color);
      padding-top: 12px;
    }

    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }

    /* 需求表单与联系 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 30px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }

    .contact-info-panel {
      background: linear-gradient(135deg, #0d59f2 0%, #0088cc 100%);
      color: #ffffff;
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-info-panel h3 {
      font-size: 1.6rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .contact-info-panel p {
      font-size: 0.95rem;
      opacity: 0.9;
      line-height: 1.6;
      margin-bottom: 24px;
    }

    .contact-details-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 24px;
    }

    .contact-details-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.95rem;
    }

    .qr-code-box {
      background: #ffffff;
      padding: 12px;
      border-radius: 10px;
      width: 140px;
      text-align: center;
      color: var(--text-main);
      font-size: 0.8rem;
      font-weight: 600;
    }

    .form-panel {
      padding: 40px;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      font-family: inherit;
      color: var(--text-main);
      background: var(--bg-page);
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-color);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(13, 89, 242, 0.1);
    }

    /* 资讯与友情链接 */
    .article-links-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      box-shadow: var(--card-shadow);
      margin-bottom: 24px;
    }

    .article-links-wrap h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .link-chips {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .link-chips a {
      display: inline-block;
      padding: 8px 16px;
      background: var(--bg-page);
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.88rem;
      color: var(--text-sub);
      transition: var(--transition);
    }

    .link-chips a:hover {
      background: var(--primary-light);
      color: var(--primary-color);
      border-color: var(--primary-color);
    }

    /* 底部通用样式 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 40px 0 24px;
      color: var(--text-sub);
      font-size: 0.9rem;
    }

    .footer-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border-color);
    }

    .footer-bottom {
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* 悬浮客服挂件 */
    .float-service-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      color: var(--primary-color);
      border: 1px solid var(--border-color);
      cursor: pointer;
      transition: var(--transition);
      position: relative;
    }

    .float-btn:hover {
      background: var(--primary-color);
      color: #ffffff;
      transform: translateY(-2px);
    }

    .qr-popover {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 12px;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
      border: 1px solid var(--border-color);
      width: 140px;
      text-align: center;
      display: none;
    }

    .float-btn:hover .qr-popover {
      display: block;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .platform-features, .workflow-steps, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-item:nth-child(2) {
        border-right: none;
      }
      .case-gallery {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .faq-list {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        display: none;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-menu.active {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        padding: 12px 0;
        border-bottom: 1px solid #f2f4f7;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .platform-features, .workflow-steps, .testimonials-grid, .stats-bar {
        grid-template-columns: 1fr;
      }
      .stat-item {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 12px;
      }
      .stat-item:last-child {
        border-bottom: none;
        padding-bottom: 0;
      }
    }