/* 全局变量与 Reset */
    :root {
      --primary-color: #2563eb;
      --primary-hover: #1d4ed8;
      --secondary-color: #0d9488;
      --accent-color: #f59e0b;
      --bg-body: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
      --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --container-max-width: 1200px;
      --transition: all 0.25s 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, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-body);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    section {
      padding: 70px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    }

    /* 标题与眉标规范 */
    .section-header {
      text-align: center;
      margin-bottom: 50px;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background-color: rgba(37, 99, 235, 0.1);
      color: var(--primary-color);
      font-size: 0.875rem;
      font-weight: 600;
      border-radius: 20px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 720px;
      margin: 0 auto;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 26px;
      font-size: 1rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
      text-align: center;
      gap: 8px;
    }

    .btn-primary {
      background-color: var(--primary-color);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
    }

    .btn-secondary {
      background-color: #ffffff;
      color: var(--text-main) !important;
      border-color: var(--border-color);
    }

    .btn-secondary:hover {
      background-color: var(--bg-alt);
      border-color: var(--primary-color);
      transform: translateY(-2px);
    }

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

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

    /* 顶部导航 */
    .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-color);
      box-shadow: var(--shadow-sm);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .brand-area {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    .ai-page-home-link {
      font-weight: 600;
      color: var(--text-main);
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      background-color: var(--bg-alt);
    }

    /* 用户要求：页面CSS .nav-links的gap属性设置为0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      border-radius: var(--radius-sm);
      white-space: nowrap;
    }

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

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

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

    /* 首屏 HERO（注：首屏严格禁止使用任何图片） */
    .hero-section {
      background: linear-gradient(135deg, #ffffff 0%, #eff6ff 50%, #f0fdf4 100%);
      padding: 90px 0 80px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background-color: #ffffff;
      border: 1px solid #bfdbfe;
      border-radius: 30px;
      color: var(--primary-color);
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 960px;
      margin: 0 auto;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-color);
      line-height: 1.2;
    }

    .stat-label {
      font-size: 0.875rem;
      color: var(--text-light);
      margin-top: 4px;
    }

    /* 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 {
      background: var(--bg-card);
      padding: 30px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .model-tags-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 15px;
    }

    .model-tag {
      background-color: var(--bg-alt);
      color: var(--text-muted);
      padding: 5px 12px;
      border-radius: 6px;
      font-size: 0.85rem;
      font-weight: 500;
      border: 1px solid #e2e8f0;
    }

    /* AIGC 服务与能力 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .service-card {
      background: var(--bg-card);
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      transition: var(--transition);
    }

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

    .service-icon {
      width: 48px;
      height: 48px;
      background: rgba(37, 99, 235, 0.1);
      color: var(--primary-color);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 18px;
    }

    .service-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .service-desc {
      color: var(--text-muted);
      font-size: 0.925rem;
    }

    /* 一站式创作矩阵 */
    .creation-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
      gap: 20px;
    }

    .creation-item {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .creation-item:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--secondary-color);
    }

    .creation-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--secondary-color);
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 8px;
    }

    /* 行业方案 */
    .industry-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
      gap: 24px;
    }

    .industry-card {
      background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
      padding: 30px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
    }

    /* 服务网络 */
    .network-box {
      background: var(--bg-card);
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      text-align: center;
    }

    .network-cities {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
    }

    .city-chip {
      padding: 8px 16px;
      background: var(--bg-alt);
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 500;
    }

    /* 标准流程 */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: var(--bg-card);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary-color);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 14px;
    }

    /* 案例中心 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 24px;
    }

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

    .case-img-wrap {
      width: 100%;
      height: 190px;
      overflow: hidden;
      background-color: var(--bg-alt);
    }

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

    .case-content {
      padding: 20px;
    }

    /* 对比评测 */
    .comparison-section {
      background: var(--bg-card);
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(90deg, #eff6ff 0%, #e0f2fe 100%);
      padding: 24px 32px;
      border-radius: var(--radius-md);
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 16px;
    }

    .rating-score {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary-color);
    }

    .rating-stars {
      color: var(--accent-color);
      font-size: 1.4rem;
    }

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

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

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

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

    .comp-table tr:hover {
      background-color: #f8fafc;
    }

    .highlight-col {
      background-color: rgba(37, 99, 235, 0.03);
      font-weight: 600;
      color: var(--primary-color);
    }

    /* 需求匹配 */
    .match-box {
      background: var(--bg-card);
      padding: 30px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
    }

    .match-options {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 20px;
    }

    .match-option-card {
      padding: 20px;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
    }

    .match-option-card:hover {
      border-color: var(--primary-color);
      background: #eff6ff;
    }

    /* Token 比价 */
    .price-table-wrap {
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 20px;
    }

    .price-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 650px;
    }

    .price-table th, .price-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
      text-align: left;
    }

    .price-badge {
      display: inline-block;
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 0.75rem;
      background: #dcfce7;
      color: #15803d;
      font-weight: 700;
    }

    /* 帮助中心与 AI百科 */
    .help-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }

    .help-card {
      background: var(--bg-card);
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    /* 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-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 20px;
      text-align: left;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-question::after {
      content: '+';
      font-size: 1.4rem;
      color: var(--primary-color);
      transition: transform 0.2s;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background-color: var(--bg-alt);
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 20px;
      border-top: 1px solid var(--border-color);
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .review-card {
      background: var(--bg-card);
      padding: 26px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-top: 16px;
    }

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

    /* 行业资讯 / 链接 */
    .news-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    .news-card {
      background: var(--bg-card);
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .news-links-grid {
      margin-top: 20px;
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .news-link-btn {
      padding: 8px 16px;
      background: #eff6ff;
      color: var(--primary-color);
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      font-weight: 500;
    }

    /* 加盟代理 */
    .agent-box {
      background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
      color: #ffffff;
      padding: 50px;
      border-radius: var(--radius-lg);
      text-align: center;
    }

    .agent-box h3 {
      font-size: 2rem;
      margin-bottom: 16px;
    }

    .agent-box p {
      color: #94a3b8;
      max-width: 650px;
      margin: 0 auto 30px;
    }

    /* 联系我们与表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }

    .contact-info {
      background: var(--bg-card);
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
    }

    .qr-code-area {
      margin-top: 24px;
      padding: 16px;
      background: var(--bg-alt);
      border-radius: var(--radius-md);
      display: inline-block;
      text-align: center;
    }

    .qr-code-area img {
      width: 140px;
      height: 140px;
      object-fit: cover;
      border-radius: var(--radius-sm);
    }

    .contact-form-card {
      background: var(--bg-card);
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .form-group label {
      display: block;
      font-weight: 600;
      margin-bottom: 8px;
      font-size: 0.925rem;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background-color: var(--bg-body);
      color: var(--text-main);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary-color);
      background-color: #ffffff;
    }

    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }

    /* 页脚与友情链接 */
    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 30px;
      color: var(--text-muted);
    }

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

    .friend-links-area {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      margin-top: 24px;
    }

    .friend-links-title {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 0.875rem;
    }

    .friend-links-list a {
      color: var(--text-muted);
    }

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

    .footer-bottom {
      text-align: center;
      font-size: 0.875rem;
      color: var(--text-light);
      padding-top: 24px;
      border-top: 1px solid var(--border-color);
    }

    /* 浮动组件 */
    .float-cs {
      position: fixed;
      right: 20px;
      bottom: 80px;
      z-index: 999;
      background: var(--primary-color);
      color: #ffffff !important;
      padding: 12px 18px;
      border-radius: 30px;
      box-shadow: var(--shadow-lg);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
    }

    .back-top {
      position: fixed;
      right: 20px;
      bottom: 25px;
      z-index: 999;
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      width: 42px;
      height: 42px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: var(--shadow-md);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.2rem; }
      .about-grid, .contact-grid, .footer-inner { grid-template-columns: 1fr; }
      .hero-stats { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .mobile-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .nav-links li a { padding: 12px; width: 100%; }
      .hero-section { padding: 60px 0 50px; }
      .hero-title { font-size: 1.8rem; }
      .hero-stats { grid-template-columns: 1fr 1fr; gap: 12px; }
      .rating-banner { flex-direction: column; text-align: center; }
    }