:root {
      --primary: #0066FF;
      --primary-hover: #0052CC;
      --accent: #00D2B4;
      --accent-warm: #FF6B35;
      --bg-main: #F7FAFC;
      --bg-white: #FFFFFF;
      --bg-card: #FFFFFF;
      --text-main: #1A202C;
      --text-muted: #4A5568;
      --text-light: #718096;
      --border-color: #E2E8F0;
      --shadow-sm: 0 2px 8px rgba(0, 102, 255, 0.05);
      --shadow-md: 0 10px 25px rgba(0, 102, 255, 0.08);
      --shadow-hover: 0 16px 36px rgba(0, 102, 255, 0.14);
      --radius: 12px;
      --transition: all 0.28s ease-in-out;
    }

    * {
      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-main);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    /* 统一居中容器规范 */
    .container {
      width: 100%;
      max-width: 1200px;
      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(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

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

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

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      border-radius: 6px;
      transition: var(--transition);
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: rgba(0, 102, 255, 0.06);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      padding: 10px 22px;
      border-radius: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      text-decoration: none;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #0099FF 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(0, 102, 255, 0.35);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, #0088EE 100%);
      box-shadow: 0 6px 18px rgba(0, 102, 255, 0.45);
      transform: translateY(-1px);
    }

    .btn-accent {
      background: linear-gradient(135deg, var(--accent-warm) 0%, #FF8C5A 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(255, 107, 53, 0.3);
    }

    .btn-accent:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 18px rgba(255, 107, 53, 0.4);
    }

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

    .btn-outline:hover {
      background: rgba(0, 102, 255, 0.05);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
      padding: 4px;
    }

    /* 首屏 Hero (无任何图片) */
    .hero-section {
      background: linear-gradient(180deg, #FFFFFF 0%, #EDF4FF 50%, var(--bg-main) 100%);
      padding: 80px 0 60px;
      position: relative;
      overflow: hidden;
    }

    .hero-pattern {
      position: absolute;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(0, 102, 255, 0.08) 0%, rgba(0, 210, 180, 0.04) 50%, transparent 70%);
      top: -150px;
      right: -100px;
      border-radius: 50%;
      pointer-events: none;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 1;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #E8F2FF;
      color: var(--primary);
      border: 1px solid #D0E4FF;
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      color: #0F172A;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      background: linear-gradient(90deg, #0055FF, #00C2A0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

    .btn-hero-main {
      font-size: 1.1rem;
      padding: 14px 34px;
      border-radius: 10px;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #FFFFFF;
      border: 1px solid #D8E6FC;
      box-shadow: var(--shadow-md);
      padding: 24px;
      border-radius: 16px;
      text-align: left;
    }

    .metric-card {
      border-right: 1px solid var(--border-color);
      padding-right: 16px;
    }

    .metric-card:last-child {
      border-right: none;
      padding-right: 0;
    }

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

    .metric-num small {
      font-size: 1rem;
      font-weight: 600;
    }

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

    /* 通用板块与排版 */
    .section {
      padding: 70px 0;
    }

    .section-alt {
      background: #FFFFFF;
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1.5px;
      background: rgba(0, 102, 255, 0.08);
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: #1A202C;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 平台核心架构介绍 */
    .platform-intro-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .intro-feature-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
    }

    .intro-feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #B3D1FF;
    }

    .feature-icon-badge {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(0, 102, 255, 0.12) 0%, rgba(0, 210, 180, 0.12) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      color: var(--primary);
    }

    .intro-feature-card h3 {
      font-size: 1.22rem;
      font-weight: 700;
      color: #2D3748;
      margin-bottom: 10px;
    }

    .intro-feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 多场景能力矩阵 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .scenario-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 22px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .scenario-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }

    .scenario-tag {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--primary);
      background: #EBF4FF;
      padding: 2px 8px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 10px;
    }

    .scenario-card h3 {
      font-size: 1.08rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: #1A202C;
    }

    .scenario-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 支持模型标签云 */
    .model-tags-container {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 30px;
      margin-top: 36px;
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .model-tags-header {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 18px;
    }

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

    .model-tag-item {
      background: #F1F5F9;
      color: #334155;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.86rem;
      font-weight: 600;
      border: 1px solid #E2E8F0;
      transition: var(--transition);
    }

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

    /* 对比评测板块 */
    .review-score-panel {
      background: linear-gradient(135deg, #0052CC 0%, #0088FF 100%);
      color: #FFFFFF;
      border-radius: 14px;
      padding: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 36px;
      box-shadow: 0 12px 30px rgba(0, 82, 204, 0.25);
    }

    .score-left h3 {
      font-size: 1.6rem;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .score-left p {
      font-size: 0.98rem;
      opacity: 0.9;
    }

    .score-right {
      display: flex;
      align-items: center;
      gap: 24px;
      text-align: right;
    }

    .stars-block {
      color: #FFD000;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

    .score-number {
      font-size: 3.2rem;
      font-weight: 900;
      line-height: 1;
    }

    .score-number small {
      font-size: 1.2rem;
      font-weight: 500;
      opacity: 0.85;
    }

    .table-responsive {
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

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

    .compare-table th {
      background: #F8FAFC;
      color: #475569;
      font-weight: 700;
    }

    .compare-table tr:hover td {
      background: #F8FAFC;
    }

    .highlight-col {
      background: rgba(0, 102, 255, 0.03);
      font-weight: 600;
      color: var(--primary);
    }

    .tag-green {
      color: #0E9F6E;
      background: #DEF7EC;
      padding: 3px 8px;
      border-radius: 4px;
      font-size: 0.82rem;
      font-weight: 600;
    }

    /* 流程与网络 */
    .steps-container {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .step-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
      position: relative;
    }

    .step-badge {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFFFFF;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
    }

    .step-box h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }

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

    /* 案例中心展示 */
    .case-gallery {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 30px;
    }

    .case-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #EAEEF3;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

    .case-info h3 {
      font-size: 1.15rem;
      margin-bottom: 6px;
    }

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

    .banner-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .banner-item {
      border-radius: 8px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #FFFFFF;
    }

    .banner-item img {
      width: 100%;
      height: auto;
      display: block;
    }

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

    .review-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #EDF2F7;
      padding-top: 14px;
    }

    .user-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #E2E8F0;
      color: var(--primary);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
    }

    .user-name {
      font-weight: 700;
      font-size: 0.95rem;
    }

    .user-role {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* FAQ 折叠面板 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 22px;
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
      color: #2D3748;
    }

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #F8FAFC;
    }

    .faq-answer p {
      padding: 18px 22px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px solid #EDF2F7;
    }

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

    .faq-item.active .faq-answer {
      max-height: 250px;
    }

    /* 文章与资讯 */
    .articles-section-content {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .articles-tags-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-external-link {
      background: #F1F5F9;
      color: var(--primary);
      text-decoration: none;
      font-size: 0.88rem;
      font-weight: 500;
      padding: 8px 16px;
      border-radius: 6px;
      border: 1px solid #E2E8F0;
      transition: var(--transition);
    }

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

    /* 表单与需求匹配 */
    .contact-form-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: start;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .contact-info-col h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
    }

    .contact-methods {
      margin-top: 24px;
      list-style: none;
    }

    .contact-methods li {
      margin-bottom: 14px;
      font-size: 0.95rem;
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text-muted);
    }

    .qr-box {
      margin-top: 20px;
      display: inline-block;
      text-align: center;
      border: 1px solid var(--border-color);
      padding: 12px;
      border-radius: 8px;
      background: #FAFBFD;
    }

    .qr-box img {
      max-width: 140px;
      height: auto;
      display: block;
      margin: 0 auto 8px;
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: #374151;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #CBD5E1;
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      background: #FFFFFF;
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.15);
    }

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

    /* 友情链接与页脚 */
    .site-footer {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      padding: 40px 0 24px;
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    .footer-links-box {
      padding-bottom: 24px;
      margin-bottom: 24px;
      border-bottom: 1px solid #EDF2F7;
    }

    .footer-links-title {
      font-weight: 700;
      color: #1E293B;
      margin-bottom: 12px;
    }

    .footer-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .footer-links-list a {
      color: #64748B;
      text-decoration: none;
      transition: var(--transition);
    }

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

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }

    .footer-contact-summary {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    /* 浮动客服入口 */
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .floating-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      box-shadow: 0 4px 16px rgba(0, 102, 255, 0.4);
      cursor: pointer;
      border: none;
      font-size: 1.25rem;
      transition: var(--transition);
    }

    .floating-btn:hover {
      transform: scale(1.08);
      background: var(--primary-hover);
    }

    .qr-popup {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #FFFFFF;
      padding: 12px;
      border-radius: 8px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.15);
      border: 1px solid var(--border-color);
      width: 160px;
      text-align: center;
    }

    .qr-popup img {
      width: 100%;
      height: auto;
      display: block;
      margin-bottom: 6px;
    }

    .qr-popup span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .floating-contact:hover .qr-popup {
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .platform-intro-grid,
      .scenario-grid,
      .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-container {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-form-layout {
        grid-template-columns: 1fr;
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
      }
      .metric-card {
        border-right: none;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        padding: 16px 0;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 12px 0;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .platform-intro-grid,
      .scenario-grid,
      .case-gallery,
      .banner-grid,
      .reviews-grid,
      .steps-container {
        grid-template-columns: 1fr;
      }
      .review-score-panel {
        flex-direction: column;
        text-align: center;
        gap: 20px;
      }
      .score-right {
        flex-direction: column;
        text-align: center;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }