:root {
      --primary: #0284c7;
      --primary-hover: #0369a1;
      --primary-light: #e0f2fe;
      --accent: #2563eb;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-sub: #64748b;
      --bg-base: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --border-hover: #cbd5e1;
      --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --container-max: 1200px;
    }

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

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

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    .site-header {
      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);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap .ai-page-logo {
      height: 40px;
      width: auto;
    }
    .brand-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }
    .nav-links li a:hover, .nav-links li a.active {
      color: var(--primary);
      background: var(--primary-light);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* 通用按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.2s ease;
      border: 1px solid transparent;
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 2px 4px rgba(2, 132, 199, 0.2);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      color: #ffffff;
      transform: translateY(-1px);
    }
    .btn-outline {
      background-color: #ffffff;
      color: var(--text-main);
      border-color: var(--border-color);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: var(--primary-light);
    }
    .btn-lg {
      padding: 14px 32px;
      font-size: 1.05rem;
    }

    /* 通用区块排版 */
    .section-wrap {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px auto;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      background-color: var(--primary-light);
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: 20px;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2rem;
      color: var(--text-main);
      margin-bottom: 16px;
      font-weight: 700;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 首屏 Hero (无图片规范) */
    .hero-section {
      background: linear-gradient(180deg, #f0fdf4 0%, #f8fafc 100%);
      padding: 80px 0 90px 0;
      text-align: center;
      position: relative;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-content {
      max-width: 880px;
      margin: 0 auto;
    }
    .hero-h1 {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-lead {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }
    .hero-tags {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      flex-wrap: wrap;
    }
    .hero-tag-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      color: var(--text-sub);
    }

    /* 指标网格 */
    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }
    .metric-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.2s ease;
    }
    .metric-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .metric-card .num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .metric-card .label {
      font-size: 0.95rem;
      color: var(--text-sub);
      font-weight: 500;
    }

    /* 服务与能力卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    .service-icon-box {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .service-card h3 {
      font-size: 1.2rem;
      color: var(--text-main);
      margin-bottom: 12px;
      font-weight: 600;
    }
    .service-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 场景列表网格 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .scene-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      transition: all 0.2s ease;
    }
    .scene-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .scene-card h4 {
      font-size: 1.05rem;
      color: var(--text-main);
      margin-bottom: 8px;
      font-weight: 600;
    }
    .scene-card p {
      font-size: 0.9rem;
      color: var(--text-sub);
      line-height: 1.5;
    }

    /* 模型徽章集合 */
    .model-badge-container {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-badge {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
    }

    /* 对比评测表格 */
    .review-score-banner {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 16px;
    }
    .review-left {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .score-badge-big {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
    }
    .rating-stars {
      color: #f59e0b;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }
    .custom-table th {
      background: #f1f5f9;
      color: var(--text-main);
      font-weight: 600;
    }
    .custom-table tr:last-child td {
      border-bottom: none;
    }
    .highlight-cell {
      background: #f0fdf4;
      font-weight: 600;
      color: #166534;
    }

    /* 案例中心图文 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .case-img-wrap {
      aspect-ratio: 16/9;
      background: #f1f5f9;
      overflow: hidden;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }
    .case-body {
      padding: 20px;
      flex-grow: 1;
    }
    .case-body h4 {
      font-size: 1.1rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .case-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 流程步骤 */
    .steps-container {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .step-num {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 16px;
    }
    .step-item h4 {
      font-size: 1.1rem;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .step-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 用户评论 */
    .grid-reviews {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    .avatar-char {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }
    .review-meta h4 {
      font-size: 1rem;
      color: var(--text-main);
    }
    .review-meta span {
      font-size: 0.85rem;
      color: var(--text-sub);
    }
    .review-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* FAQ 手风琴 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-accordion-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.2s ease;
    }
    .faq-accordion-item.active {
      border-color: var(--primary);
    }
    .faq-question-btn {
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-question-btn span.icon {
      font-size: 1.2rem;
      transition: transform 0.2s ease;
    }
    .faq-accordion-item.active .faq-question-btn span.icon {
      transform: rotate(45deg);
    }
    .faq-answer-panel {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fafafa;
    }
    .faq-answer-content {
      padding: 16px 24px 20px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 表单与联系区 */
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      align-items: flex-start;
    }
    .contact-info-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
    }
    .info-row {
      margin-bottom: 20px;
    }
    .info-row h4 {
      font-size: 0.95rem;
      color: var(--text-sub);
      margin-bottom: 4px;
    }
    .info-row p {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .qr-box {
      margin-top: 24px;
      display: inline-block;
      text-align: center;
      padding: 12px;
      border: 1px dashed var(--border-color);
      border-radius: var(--radius-sm);
    }
    .qr-box img {
      width: 140px;
      height: 140px;
      margin: 0 auto 8px auto;
    }
    .qr-box span {
      font-size: 0.85rem;
      color: var(--text-sub);
      display: block;
    }
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background: #f8fafc;
      transition: all 0.2s ease;
      font-family: inherit;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 行业资讯文章链接 */
    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 24px;
    }
    .article-tag-link {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      color: var(--text-muted);
      transition: all 0.2s ease;
    }
    .article-tag-link:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 40px 0 24px 0;
      color: var(--text-muted);
    }
    .footer-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 24px;
      flex-wrap: wrap;
      gap: 16px;
    }
    .footer-brand {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .friendly-links {
      margin-bottom: 24px;
    }
    .friendly-links-title {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .friendly-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }
    .friendly-links-list a {
      font-size: 0.9rem;
      color: var(--text-sub);
    }
    .friendly-links-list a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
      color: var(--text-sub);
      flex-wrap: wrap;
      gap: 12px;
    }

    /* 悬浮侧栏 */
    .float-panel {
      position: fixed;
      right: 20px;
      bottom: 40px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 50%;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--text-main);
      font-size: 1.2rem;
      transition: all 0.2s ease;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* 响应式样式 */
    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-container {
        grid-template-columns: repeat(2, 1fr);
      }
      .metric-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .hero-h1 {
        font-size: 1.85rem;
      }
      .grid-3, .case-grid, .grid-reviews {
        grid-template-columns: 1fr;
      }
      .grid-4, .steps-container, .metric-grid {
        grid-template-columns: 1fr;
      }
      .contact-container {
        grid-template-columns: 1fr;
      }
      .review-score-banner {
        flex-direction: column;
        align-items: flex-start;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }