/* 全局 CSS 变量设定 - 渐变青科技风 (Light Palette with Vivid Cyan Accents) */
    :root {
      --primary: #00a896;
      --primary-dark: #028090;
      --primary-deep: #05668d;
      --accent: #02c39a;
      --bg-gradient: linear-gradient(135deg, #f0f9f8 0%, #e6f4f3 50%, #f7fcfc 100%);
      --bg-light: #ffffff;
      --bg-alt: #f4f9f9;
      --text-main: #112233;
      --text-muted: #4a607a;
      --border-color: #d1e7e5;
      --shadow-sm: 0 4px 12px rgba(2, 128, 144, 0.06);
      --shadow-md: 0 8px 24px rgba(2, 128, 144, 0.12);
      --shadow-lg: 0 16px 36px rgba(2, 128, 144, 0.16);
      --radius: 12px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: #f7fcfc;
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background: var(--bg-gradient);
    }

    a {
      color: var(--primary-deep);
      text-decoration: none;
      transition: var(--transition);
    }

    a:hover {
      color: var(--accent);
    }

    /* 容器规范 */
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .ai-page-logo {
      max-height: 44px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: -0.5px;
    }

    /* 导航链接 - 严格设置 gap 为 0 */
    .nav-links {
      gap: 0;
      display: flex;
      align-items: center;
      list-style: none;
    }

    .nav-links li a {
      padding: 8px 14px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: 6px;
      display: inline-block;
    }

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

    .header-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: 30px;
      cursor: pointer;
      border: none;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(0, 168, 150, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 168, 150, 0.45);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary-dark) !important;
    }

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

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--primary-deep);
      cursor: pointer;
    }

    /* 首屏 HERO 区域 - 严禁出现任何图片 */
    .hero-section {
      padding: 90px 0 70px;
      text-align: center;
      position: relative;
      background: radial-gradient(circle at 50% 20%, rgba(2, 195, 154, 0.15) 0%, rgba(240, 249, 248, 0) 70%);
      overflow: hidden;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: rgba(0, 168, 150, 0.1);
      border: 1px solid rgba(0, 168, 150, 0.3);
      border-radius: 50px;
      color: var(--primary-dark);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--primary-deep);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .btn-hero-main {
      padding: 14px 36px;
      font-size: 1.1rem;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .stat-card {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .stat-number {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 公用 Section 布局 */
    .section-padding {
      padding: 80px 0;
    }

    .section-alt {
      background-color: var(--bg-alt);
    }

    .section-header {
      text-align: center;
      max-width: 750px;
      margin: 0 auto 50px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary);
      letter-spacing: 1.5px;
      margin-bottom: 10px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* 网格卡片系统 */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .cards-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

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

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .feature-icon {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: rgba(0, 168, 150, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      font-weight: 700;
    }

    .feature-card h3 {
      font-size: 1.2rem;
      color: var(--primary-deep);
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      flex-grow: 1;
    }

    /* 支持模型标签云 */
    .models-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary-deep);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .model-tag:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: scale(1.05);
    }

    /* 对比评测表格与卡片 */
    .comparison-wrapper {
      background: var(--bg-light);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
      padding: 30px;
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, rgba(0,168,150,0.08) 0%, rgba(2,128,144,0.12) 100%);
      border-radius: var(--radius);
      padding: 24px 30px;
      margin-bottom: 30px;
      border: 1px solid rgba(0,168,150,0.2);
    }

    .rating-score {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .score-val {
      font-size: 3rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .stars {
      color: #f39c12;
      font-size: 1.3rem;
      margin-bottom: 4px;
    }

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

    .comp-table th, .comp-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    .comp-table th {
      background: var(--bg-alt);
      color: var(--primary-deep);
      font-weight: 700;
    }

    .comp-table td.highlight {
      font-weight: 700;
      color: var(--primary);
      background: rgba(0,168,150,0.03);
    }

    /* 流程步骤 */
    .process-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 15px;
      position: relative;
    }

    .process-step {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px 14px;
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 12px;
      font-weight: 700;
    }

    .process-step h4 {
      font-size: 1rem;
      color: var(--primary-deep);
      margin-bottom: 6px;
    }

    .process-step p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* 案例中心展示 */
    .case-card {
      background: var(--bg-light);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .case-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .case-img-wrap {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: var(--bg-alt);
    }

    .ai-page-image {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }

    .case-card:hover .ai-page-image {
      transform: scale(1.04);
    }

    .case-content {
      padding: 20px;
    }

    .case-tag {
      font-size: 0.78rem;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 6px;
      display: inline-block;
    }

    .case-content h4 {
      font-size: 1.1rem;
      color: var(--primary-deep);
      margin-bottom: 8px;
    }

    .case-content p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      color: var(--primary-deep);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.05rem;
    }

    .faq-question::after {
      content: '+';
      font-size: 1.4rem;
      color: var(--primary);
      transition: var(--transition);
    }

    .faq-item.active .faq-question::after {
      content: '−';
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      transition: max-height 0.3s ease, padding 0.3s ease;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px;
    }

    /* 客户评论卡片 */
    .review-card {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    .user-avatar-text {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .user-info h5 {
      font-size: 1rem;
      color: var(--primary-deep);
    }

    .user-info span {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      font-style: italic;
    }

    /* 联系我们与需求表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: var(--bg-light);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

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

    .contact-info h3 {
      font-size: 1.8rem;
      margin-bottom: 16px;
    }

    .contact-info p {
      color: rgba(255,255,255,0.85);
      margin-bottom: 24px;
      font-size: 0.95rem;
    }

    .contact-detail-list {
      list-style: none;
      margin-bottom: 30px;
    }

    .contact-detail-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.95rem;
    }

    .qr-container {
      text-align: center;
      background: rgba(255,255,255,0.1);
      padding: 20px;
      border-radius: 10px;
    }

    .qr-container img {
      width: 140px;
      height: 140px;
      border-radius: 8px;
      object-fit: cover;
      margin-bottom: 8px;
    }

    .contact-form-side {
      padding: 40px;
    }

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

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

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0,168,150,0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 最新文章与友情链接区 */
    .article-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item-link {
      display: flex;
      justify-content: space-between;
      padding: 14px 20px;
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      transition: var(--transition);
    }

    .article-item-link:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }

    .friendship-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 15px;
    }

    .friendship-links a {
      padding: 6px 14px;
      background: rgba(0, 168, 150, 0.08);
      border-radius: 6px;
      font-size: 0.88rem;
      color: var(--primary-deep);
      font-weight: 500;
    }

    .friendship-links a:hover {
      background: var(--primary);
      color: #fff;
    }

    /* 页脚 */
    .site-footer {
      background: #0d1e2b;
      color: #a0aec0;
      padding: 60px 0 30px;
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      color: #a0aec0;
    }

    .footer-links a:hover {
      color: var(--accent);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 25px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 15px;
    }

    .ai-page-home-link {
      color: var(--accent);
      font-weight: 600;
    }

    /* 浮动客服 */
    .floating-widgets {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .widget-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      font-size: 1.2rem;
      border: none;
      transition: var(--transition);
    }

    .widget-btn:hover {
      transform: scale(1.1);
      background: var(--primary-dark);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cards-grid-3, .cards-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 1.9rem;
      }
      .cards-grid-3, .cards-grid-4 {
        grid-template-columns: 1fr;
      }
      .process-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        gap: 15px;
        text-align: center;
      }
    }