:root {
      --primary-cyan: #0d9488;
      --primary-cyan-dark: #0f766e;
      --primary-cyan-light: #ccfbf1;
      --accent-teal: #14b8a6;
      --accent-gradient: linear-gradient(135deg, #0d9488 0%, #0284c7 100%);
      --bg-light: #f8fafc;
      --bg-white: #ffffff;
      --bg-card: #ffffff;
      --text-dark: #0f172a;
      --text-slate: #334155;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.25s 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, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

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

    /* 顶部导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      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-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }
    .nav-links {
      display: flex;
      gap: 0;
      align-items: center;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-slate);
      transition: var(--transition);
      padding: 8px 14px;
      border-radius: 6px;
    }
    .nav-links a:hover {
      color: var(--primary-cyan);
      background-color: var(--primary-cyan-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: 14px;
      font-weight: 600;
      border-radius: 8px;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
      text-align: center;
    }
    .btn-primary {
      background: var(--accent-gradient);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(13, 148, 136, 0.25);
    }
    .btn-primary:hover {
      box-shadow: 0 6px 16px rgba(13, 148, 136, 0.35);
      transform: translateY(-2px);
    }
    .btn-outline {
      border-color: var(--primary-cyan);
      color: var(--primary-cyan);
      background-color: transparent;
    }
    .btn-outline:hover {
      background-color: var(--primary-cyan-light);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
      cursor: pointer;
    }

    /* 首屏纯科技视觉 无图 */
    .hero-section {
      background: radial-gradient(circle at 80% 20%, rgba(20, 184, 166, 0.12) 0%, rgba(255, 255, 255, 0) 60%),
                  radial-gradient(circle at 10% 90%, rgba(2, 132, 199, 0.08) 0%, rgba(255, 255, 255, 0) 50%),
                  #f0fdfa;
      padding: 90px 0 80px 0;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background: #ccfbf1;
      color: var(--primary-cyan-dark);
      font-size: 13px;
      font-weight: 600;
      border-radius: 9999px;
      margin-bottom: 24px;
      letter-spacing: 0.5px;
      border: 1px solid rgba(13, 148, 136, 0.2);
    }
    .hero-title {
      font-size: 40px;
      line-height: 1.25;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-desc {
      font-size: 18px;
      line-height: 1.7;
      color: var(--text-slate);
      margin-bottom: 36px;
    }
    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .hero-features-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }
    .hero-stat-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      text-align: left;
      border-top: 3px solid var(--primary-cyan);
    }
    .hero-stat-title {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 6px;
    }
    .hero-stat-val {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary-cyan-dark);
    }

    /* 模块通用样式 */
    .section {
      padding: 80px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-white);
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }
    .section-subtitle {
      color: var(--primary-cyan);
      font-size: 14px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 平台介绍 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .about-text h3 {
      font-size: 24px;
      margin-bottom: 16px;
      color: var(--text-dark);
    }
    .about-text p {
      color: var(--text-slate);
      margin-bottom: 20px;
      line-height: 1.8;
    }
    .feature-list {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-top: 24px;
    }
    .feature-list li {
      display: flex;
      align-items: center;
      font-size: 15px;
      color: var(--text-slate);
      gap: 8px;
    }
    .feature-list li::before {
      content: "✓";
      color: var(--primary-cyan);
      font-weight: bold;
      background: var(--primary-cyan-light);
      width: 20px;
      height: 20px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
    }
    .media-card-wrap {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      background: #ffffff;
      padding: 10px;
    }
    .media-card-wrap img {
      width: 100%;
      height: auto;
      border-radius: var(--radius-md);
      display: block;
    }

    /* 网格服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      transition: var(--transition);
      position: relative;
    }
    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: var(--accent-teal);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-cyan-light);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-cyan-dark);
      font-size: 20px;
      margin-bottom: 20px;
    }
    .service-title {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-dark);
    }
    .service-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 场景矩阵多卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .scenario-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: var(--radius-md);
      transition: var(--transition);
    }
    .scenario-item:hover {
      border-color: var(--primary-cyan);
      box-shadow: var(--shadow-md);
    }
    .scenario-item h4 {
      font-size: 17px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-dark);
    }
    .scenario-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 支持模型平台标签云 */
    .models-tag-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      padding: 30px;
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .model-tag {
      padding: 8px 16px;
      background: #f1f5f9;
      color: var(--text-slate);
      font-size: 13px;
      font-weight: 600;
      border-radius: 8px;
      border: 1px solid #e2e8f0;
      transition: var(--transition);
    }
    .model-tag:hover {
      background: var(--primary-cyan-light);
      color: var(--primary-cyan-dark);
      border-color: var(--primary-cyan);
    }

    /* 对比评测表格与卡片 */
    .eval-highlight {
      background: linear-gradient(135deg, #f0fdfa 0%, #ffffff 100%);
      border: 2px solid var(--primary-cyan);
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }
    .eval-score-num {
      font-size: 48px;
      font-weight: 800;
      color: var(--primary-cyan-dark);
      line-height: 1;
    }
    .eval-stars {
      color: #f59e0b;
      font-size: 20px;
      margin-top: 4px;
    }
    .table-responsive {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background: #f8fafc;
      font-weight: 600;
      color: var(--text-slate);
    }
    .compare-table tr:hover td {
      background: #f8fafc;
    }
    .badge-check {
      color: #10b981;
      font-weight: 700;
    }

    /* 标准流程时间线 */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary-cyan);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .step-card h4 {
      font-size: 16px;
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 案例中心展示 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .case-box {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .case-img-wrap {
      width: 100%;
      height: auto;
      overflow: hidden;
      background: #f1f5f9;
    }
    .case-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }
    .case-img-wrap:hover img {
      transform: scale(1.03);
    }
    .case-body {
      padding: 24px;
    }
    .case-body h4 {
      font-size: 18px;
      margin-bottom: 10px;
    }
    .case-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    .review-avatar-txt {
      width: 44px;
      height: 44px;
      background: var(--primary-cyan-light);
      color: var(--primary-cyan-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }
    .review-info h5 {
      font-size: 15px;
      color: var(--text-dark);
    }
    .review-info span {
      font-size: 12px;
      color: var(--text-muted);
    }
    .review-text {
      font-size: 14px;
      color: var(--text-slate);
      line-height: 1.6;
    }

    /* FAQ折叠面板 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 16px;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--primary-cyan);
      font-weight: bold;
      transition: transform 0.2s ease;
    }
    .faq-item.active .faq-question::after {
      content: "-";
    }
    .faq-answer {
      display: none;
      padding: 0 24px 20px 24px;
      color: var(--text-slate);
      font-size: 14px;
      line-height: 1.7;
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* 需求表单与联系我们 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .contact-form-box {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-slate);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      background: #f8fafc;
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--primary-cyan);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
    }
    .contact-info-panel {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
      margin-bottom: 20px;
    }
    .contact-qrcode {
      text-align: center;
      margin-top: 20px;
      padding: 16px;
      background: #f8fafc;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }
    .contact-qrcode img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      border-radius: 6px;
    }

    /* 文章列表 */
    .article-box {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 30px;
    }
    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }
    .article-link-tag {
      padding: 8px 16px;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 13px;
      color: var(--primary-cyan-dark);
      transition: var(--transition);
    }
    .article-link-tag:hover {
      background: var(--primary-cyan-light);
    }

    /* 底部通用规范 */
    .footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 20px 0;
      font-size: 14px;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 2fr;
      gap: 40px;
      margin-bottom: 40px;
      padding-bottom: 40px;
      border-bottom: 1px solid #1e293b;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      margin-bottom: 18px;
    }
    .footer-col p {
      line-height: 1.7;
      margin-bottom: 12px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul li a {
      color: #94a3b8;
      transition: var(--transition);
    }
    .footer-col ul li a:hover {
      color: var(--accent-teal);
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 10px;
    }
    .friend-links a {
      color: #94a3b8;
      font-size: 13px;
      transition: var(--transition);
    }
    .friend-links a:hover {
      color: #38bdf8;
    }
    .footer-bottom {
      text-align: center;
      font-size: 13px;
      color: #64748b;
      padding-top: 20px;
    }

    /* 侧边悬浮入口 */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 99;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary-cyan);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      border: none;
      font-size: 13px;
      font-weight: 600;
      text-align: center;
      transition: var(--transition);
    }
    .float-btn:hover {
      background: var(--primary-cyan-dark);
      transform: translateY(-3px);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .cards-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenario-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-features-bar, .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-grid, .contact-wrapper, .cases-grid, .footer-top {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        box-shadow: var(--shadow-md);
      }
    }
    @media (max-width: 640px) {
      .hero-title {
        font-size: 28px;
      }
      .hero-features-bar, .cards-grid, .scenario-grid, .reviews-grid, .process-steps {
        grid-template-columns: 1fr;
      }
      .feature-list {
        grid-template-columns: 1fr;
      }
    }