/* 基础复位与高亮度鲜活风格变量 */
    :root {
      --primary-color: #2563eb;
      --primary-vibrant: #3b82f6;
      --primary-light: #eff6ff;
      --accent-color: #f59e0b;
      --accent-green: #10b981;
      --text-main: #0f172a;
      --text-muted: #475569;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-light: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 10px 25px -5px rgba(37,99,235,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
      --shadow-hover: 0 20px 30px -10px rgba(37,99,235,0.15);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
    }

    * {
      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: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
    }

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

    /* 统一布局容器 */
    .ai-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* Header 与 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

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

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

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

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

    /* Strict Rule: .nav-links gap must be 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s ease, background-color 0.2s ease;
      border-radius: var(--radius-sm);
    }

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

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

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary-color), var(--primary-vibrant));
      border: none;
      border-radius: 99px;
      text-decoration: none;
      box-shadow: 0 4px 14px rgba(37,99,235,0.3);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      cursor: pointer;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37,99,235,0.4);
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--primary-color);
      background-color: var(--primary-light);
      border: 1px solid rgba(37,99,235,0.2);
      border-radius: 99px;
      text-decoration: none;
      transition: all 0.2s ease;
    }

    .btn-secondary:hover {
      background-color: #dbeafe;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* Section 通用规范 */
    .section-padding {
      padding: 80px 0;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--primary-color);
      background-color: var(--primary-light);
      border-radius: 99px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 1. Hero 首屏（无图片，纯色彩/几何/文字/数据卡片） */
    .hero-section {
      position: relative;
      padding: 90px 0 70px 0;
      background: radial-gradient(circle at 50% 20%, #eff6ff 0%, #f8fafc 70%);
      overflow: hidden;
      border-bottom: 1px solid var(--border-light);
    }

    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background-color: #ffffff;
      border: 1px solid #bfdbfe;
      border-radius: 99px;
      font-size: 0.88rem;
      color: var(--primary-color);
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title-h1 {
      font-size: 2.3rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

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

    .stat-card {
      background-color: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.2s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
    }

    .stat-number {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-color);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 2. 关于我们与平台介绍 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .about-card-box {
      background-color: #ffffff;
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
    }

    .feature-list-simple {
      list-style: none;
      margin-top: 20px;
    }

    .feature-list-simple li {
      position: relative;
      padding-left: 28px;
      margin-bottom: 12px;
      font-size: 1rem;
      color: var(--text-main);
    }

    .feature-list-simple li::before {
      content: "✓";
      position: absolute;
      left: 0;
      top: 0;
      color: var(--accent-green);
      font-weight: 900;
    }

    /* 3. AIGC服务 & 模型矩阵 */
    .platform-tags-box {
      background-color: #ffffff;
      padding: 30px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      margin-top: 30px;
    }

    .tags-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .tag-item {
      padding: 6px 14px;
      background-color: var(--primary-light);
      color: var(--primary-color);
      font-size: 0.88rem;
      font-weight: 600;
      border-radius: 6px;
    }

    /* 4 & 5. 场景卡片 / 一站式与行业方案 */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .scene-card {
      background-color: #ffffff;
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .scene-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: #bfdbfe;
    }

    .scene-icon {
      width: 48px;
      height: 48px;
      background-color: var(--primary-light);
      color: var(--primary-color);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 800;
      margin-bottom: 20px;
    }

    .scene-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .scene-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 16px;
      flex-grow: 1;
    }

    /* 6. 服务网络 */
    .network-banner {
      background: linear-gradient(135deg, #1e3a8a, #2563eb);
      color: #ffffff;
      padding: 40px;
      border-radius: var(--radius-lg);
      text-align: center;
    }

    .network-banner h3 {
      font-size: 1.8rem;
      margin-bottom: 12px;
    }

    /* 7. 标准流程 */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

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

    .step-num {
      width: 40px;
      height: 40px;
      background-color: var(--primary-color);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px auto;
      font-weight: 800;
    }

    /* 8. 案例中心（引入媒体图片） */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

    .case-img-box {
      width: 100%;
      overflow: hidden;
      background-color: #f1f5f9;
    }

    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .case-body {
      padding: 20px;
    }

    /* 9. 对比评测表格与高分勋章 */
    .comparison-wrapper {
      background-color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
    }

    .score-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, #fffbeb, #fef3c7);
      padding: 24px 32px;
      border-radius: var(--radius-md);
      border: 1px solid #fde68a;
      margin-bottom: 30px;
    }

    .score-badge-main {
      font-size: 2.2rem;
      font-weight: 900;
      color: #d97706;
    }

    .star-rating {
      color: #f59e0b;
      font-size: 1.4rem;
    }

    .comp-table-container {
      overflow-x: auto;
    }

    .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-light);
    }

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

    .comp-table tr:hover {
      background-color: #f1f5f9;
    }

    .highlight-col {
      background-color: #eff6ff;
      font-weight: 700;
      color: var(--primary-color);
    }

    /* 10. 需求匹配 */
    .match-box {
      background-color: #ffffff;
      padding: 32px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
    }

    /* 11. Token 比价表格 */
    .token-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .token-card {
      background-color: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

    .token-price {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--accent-green);
      margin: 10px 0;
    }

    /* 12. 帮助中心 & 14. AI百科 */
    .info-dual-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }

    .info-card {
      background-color: #ffffff;
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
    }

    /* 13. FAQ 手风琴 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 20px 24px;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      background-color: #fafafa;
    }

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

    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    .faq-icon {
      transition: transform 0.3s ease;
    }

    /* 客户评论卡片 (6条) */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

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

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background-color: var(--primary-light);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    /* 15. 行业资讯 */
    .news-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .news-item {
      background-color: #ffffff;
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-light);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .news-item a {
      color: var(--text-main);
      text-decoration: none;
      font-weight: 600;
    }

    .news-item a:hover {
      color: var(--primary-color);
    }

    /* 16. 联系我们 & 表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background-color: #ffffff;
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
    }

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

    .form-group label {
      display: block;
      margin-bottom: 6px;
      font-weight: 600;
      font-size: 0.92rem;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--primary-color);
    }

    /* 17. 加盟代理 */
    .agency-box {
      background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid #bfdbfe;
      text-align: center;
    }

    /* 页脚 Footer */
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      font-size: 0.9rem;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 16px;
    }

    .footer-col ul {
      list-style: none;
    }

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

    .footer-col a {
      color: #94a3b8;
      text-decoration: none;
      transition: color 0.2s ease;
    }

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

    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-top: 30px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .friend-links-box a {
      color: #64748b;
      text-decoration: none;
    }

    .friend-links-box a:hover {
      color: #94a3b8;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      text-align: center;
      color: #64748b;
    }

    /* 浮动客服与返回顶部 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background-color: var(--primary-color);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      cursor: pointer;
      text-decoration: none;
      font-size: 1.2rem;
      border: none;
      transition: transform 0.2s ease;
    }

    .float-btn:hover {
      transform: scale(1.1);
    }

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

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background-color: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-light);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show { display: flex; }
      .mobile-toggle { display: block; }
      .cards-grid-3 { grid-template-columns: 1fr; }
      .case-grid { grid-template-columns: 1fr; }
      .process-steps { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-ctas { flex-direction: column; width: 100%; }
      .hero-ctas a { width: 100%; }
      .hero-title-h1 { font-size: 1.8rem; }
    }