:root {
      --primary-color: #6366f1;
      --primary-hover: #4f46e5;
      --secondary-color: #ec4899;
      --accent-color: #06b6d4;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-light: #f8fafc;
      --bg-white: #ffffff;
      --bg-gradient: linear-gradient(135deg, #f0fdf4 0%, #eff6ff 50%, #fdf2f8 100%);
      --card-border: rgba(226, 232, 240, 0.8);
      --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
      --card-hover-shadow: 0 20px 25px -5px rgba(99, 102, 241, 0.1), 0 10px 10px -5px rgba(99, 102, 241, 0.04);
      --border-radius: 16px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.6;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 顶部导航 */
    header.site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.9);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      transition: var(--transition);
    }

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

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      background: linear-gradient(135deg, #6366f1, #ec4899);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .nav-links a, .ai-page-home-link {
      display: inline-block;
      padding: 8px 12px;
      color: var(--text-main);
      text-decoration: none;
      font-weight: 500;
      font-size: 14px;
      border-radius: 8px;
      transition: var(--transition);
    }

    .nav-links a:hover, .ai-page-home-link:hover {
      color: var(--primary-color);
      background: rgba(99, 102, 241, 0.08);
    }

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

    .btn-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 18px;
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      color: #ffffff;
      font-size: 14px;
      font-weight: 600;
      border-radius: 9999px;
      text-decoration: none;
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
      transition: var(--transition);
    }

    .btn-portal:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
      padding: 4px;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 160px 0 80px;
      background: var(--bg-gradient);
      position: relative;
      overflow: hidden;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(255, 255, 255, 0.8);
      border: 1px solid rgba(99, 102, 241, 0.2);
      border-radius: 9999px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary-color);
      margin-bottom: 24px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    }

    .hero-title {
      font-size: 44px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      background: linear-gradient(135deg, #4f46e5, #ec4899);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

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

    .btn-main {
      padding: 14px 32px;
      font-size: 16px;
      font-weight: 600;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      border-radius: 12px;
      text-decoration: none;
      box-shadow: 0 10px 25px rgba(99, 102, 241, 0.35);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 15px 30px rgba(99, 102, 241, 0.45);
    }

    .btn-secondary {
      padding: 14px 28px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 12px;
      text-decoration: none;
      transition: var(--transition);
    }

    .btn-secondary:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }

    .hero-tags-wall {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-tag {
      font-size: 12px;
      padding: 5px 12px;
      background: rgba(255, 255, 255, 0.7);
      border: 1px solid rgba(203, 213, 225, 0.6);
      border-radius: 6px;
      color: var(--text-muted);
    }

    /* 数据指标区 */
    .metrics-bar {
      padding: 40px 0;
      background: #ffffff;
      border-bottom: 1px solid #e2e8f0;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .metric-item h3 {
      font-size: 36px;
      font-weight: 800;
      color: var(--primary-color);
      margin-bottom: 4px;
      font-family: inherit;
    }

    .metric-item p {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 模块通用样式 */
    .section-wrap {
      padding: 80px 0;
      border-bottom: 1px solid #e2e8f0;
    }

    .section-wrap:nth-child(even) {
      background: #ffffff;
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 12px;
      text-transform: uppercase;
      font-weight: 700;
      color: var(--primary-color);
      letter-spacing: 1.5px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* 平台介绍与关于我们 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .intro-content h3 {
      font-size: 26px;
      font-weight: 700;
      margin-bottom: 16px;
      line-height: 1.4;
    }

    .intro-content p {
      color: var(--text-muted);
      margin-bottom: 20px;
      font-size: 15px;
    }

    .feature-points {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
    }

    .feature-point {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }

    .feature-point::before {
      content: "✓";
      color: #10b981;
      font-weight: 900;
    }

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

    .media-card img {
      width: 100%;
      height: auto;
      border-radius: 10px;
      display: block;
    }

    /* 服务能力卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #ffffff;
      padding: 28px;
      border-radius: var(--border-radius);
      border: 1px solid var(--card-border);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(99, 102, 241, 0.4);
    }

    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(99, 102, 241, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-color);
      font-size: 22px;
      margin-bottom: 20px;
    }

    .service-card h4 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 流程与步骤 */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }

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

    .step-number {
      font-size: 28px;
      font-weight: 900;
      color: rgba(99, 102, 241, 0.2);
      margin-bottom: 12px;
      display: block;
    }

    .process-step h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .process-step p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 评分与对比评测 */
    .rating-banner {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      color: #ffffff;
      border-radius: var(--border-radius);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 32px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-info h4 {
      font-size: 22px;
      margin-bottom: 6px;
    }

    .rating-stars {
      color: #fbbf24;
      font-size: 20px;
      margin-bottom: 4px;
    }

    .rating-score {
      font-size: 48px;
      font-weight: 900;
      color: #38bdf8;
      display: flex;
      align-items: baseline;
      gap: 4px;
    }

    .rating-score span {
      font-size: 18px;
      color: #94a3b8;
    }

    .comparison-table-wrapper {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--border-radius);
      border: 1px solid var(--card-border);
      box-shadow: var(--card-shadow);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
      font-size: 14px;
    }

    .comparison-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .highlight-col {
      background: rgba(99, 102, 241, 0.03);
      font-weight: 600;
      color: var(--primary-color);
    }

    /* 案例展示 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

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

    .case-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      display: block;
    }

    .case-card-body {
      padding: 16px;
    }

    .case-card-body h5 {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .case-card-body p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--border-radius);
      border: 1px solid var(--card-border);
      box-shadow: var(--card-shadow);
    }

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

    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    .review-user-name {
      font-size: 15px;
      font-weight: 700;
    }

    .review-user-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    .review-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: none;
      border: none;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-toggle-icon {
      font-size: 18px;
      transition: var(--transition);
      color: var(--text-muted);
    }

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

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

    .faq-answer p {
      padding: 0 24px 18px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 需求表单与联系 */
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
    }

    .contact-info-card {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--border-radius);
      border: 1px solid var(--card-border);
      box-shadow: var(--card-shadow);
    }

    .contact-item {
      margin-bottom: 20px;
    }

    .contact-item label {
      font-size: 12px;
      color: var(--text-muted);
      font-weight: 600;
      display: block;
      margin-bottom: 4px;
    }

    .contact-item p {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
    }

    .qrcode-box {
      margin-top: 24px;
      text-align: center;
      padding: 16px;
      background: #f8fafc;
      border-radius: 12px;
      border: 1px dashed #cbd5e1;
    }

    .qrcode-box img {
      max-width: 140px;
      height: auto;
      border-radius: 8px;
      margin-bottom: 8px;
      display: inline-block;
    }

    .form-card {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--border-radius);
      border: 1px solid var(--card-border);
      box-shadow: var(--card-shadow);
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      font-size: 14px;
      color: var(--text-main);
      background: #f8fafc;
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-color);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    }

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

    .btn-submit {
      width: 100%;
      padding: 14px;
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      color: #ffffff;
      border: none;
      border-radius: 8px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
    }

    .btn-submit:hover {
      opacity: 0.95;
      transform: translateY(-1px);
    }

    /* 资讯与外链板块 */
    .article-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
    }

    .article-link-chip {
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      color: var(--primary-color);
      text-decoration: none;
      font-size: 13px;
      font-weight: 500;
      transition: var(--transition);
    }

    .article-link-chip:hover {
      background: var(--primary-color);
      color: #ffffff;
      border-color: var(--primary-color);
    }

    /* 页脚 */
    footer.site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 14px;
    }

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

    .footer-col h5 {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 8px;
    }

    .footer-links a {
      color: #94a3b8;
      text-decoration: none;
      transition: var(--transition);
    }

    .footer-links a:hover {
      color: #ffffff;
    }

    .friend-links-area {
      padding: 20px 0;
      border-top: 1px solid #1e293b;
      border-bottom: 1px solid #1e293b;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 13px;
    }

    .friend-links-area a {
      color: #cbd5e1;
      text-decoration: none;
      transition: var(--transition);
    }

    .friend-links-area a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      text-align: center;
      color: #64748b;
      font-size: 13px;
    }

    /* 悬浮客服 */
    .float-service {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 50%;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-color);
      text-decoration: none;
      font-size: 18px;
      cursor: pointer;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary-color);
      color: #ffffff;
      transform: scale(1.05);
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        border-bottom: 1px solid #e2e8f0;
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .services-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline, .metrics-grid, .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .intro-grid, .contact-container, .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 28px;
      }
      .services-grid, .reviews-grid, .process-timeline, .metrics-grid, .case-grid {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        text-align: center;
      }
    }