:root {
      --primary-color: #6d28d9;
      --primary-gradient: linear-gradient(135deg, #7c3aed 0%, #4f46e5 100%);
      --accent-color: #ec4899;
      --bg-light: #f8f9fe;
      --bg-card: #ffffff;
      --text-main: #1e1b4b;
      --text-sub: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 4px 6px -1px rgba(124, 58, 237, 0.05);
      --shadow-lg: 0 10px 25px -5px rgba(124, 58, 237, 0.12);
      --radius-lg: 16px;
      --radius-md: 10px;
    }

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

    body {
      width: 100%;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    header.header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(124, 58, 237, 0.1);
      box-shadow: var(--shadow-sm);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
    }

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

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

    .nav-links li a {
      text-decoration: none;
      color: var(--text-main);
      font-size: 14px;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: 6px;
      transition: all 0.2s ease;
      display: inline-block;
    }

    .nav-links li a:hover, .nav-links li a.active {
      color: var(--primary-color);
      background: rgba(124, 58, 237, 0.06);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.3s ease;
      cursor: pointer;
      border: none;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(124, 58, 237, 0.45);
    }

    .btn-outline {
      border: 1px solid var(--primary-color);
      color: var(--primary-color);
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(124, 58, 237, 0.05);
    }

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

    /* 通用 Section 样式 */
    section {
      padding: 70px 0;
      position: relative;
    }

    .section-title-wrap {
      text-align: center;
      margin-bottom: 45px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      border-radius: 20px;
      background: rgba(124, 58, 237, 0.1);
      color: var(--primary-color);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 10px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 30px;
      color: var(--text-main);
      font-weight: 800;
      letter-spacing: -0.5px;
    }

    .section-desc {
      color: var(--text-sub);
      font-size: 15px;
      margin-top: 10px;
      max-width: 650px;
      margin-left: auto;
      margin-right: auto;
    }

    /* 首屏 HERO (无图片) */
    .hero-section {
      background: radial-gradient(circle at 50% 20%, rgba(124, 58, 237, 0.12) 0%, rgba(248, 249, 254, 1) 70%);
      padding: 90px 0 70px 0;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(124, 58, 237, 0.2);
      border-radius: 30px;
      font-size: 13px;
      color: var(--primary-color);
      font-weight: 600;
      margin-bottom: 25px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 38px;
      line-height: 1.25;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }

    .hero-title span {
      background: linear-gradient(135deg, #7c3aed 0%, #ec4899 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 17px;
      color: var(--text-sub);
      max-width: 780px;
      margin: 0 auto 35px auto;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 15px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .hero-actions .btn {
      padding: 14px 32px;
      font-size: 16px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .hero-stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px 20px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease;
    }

    .hero-stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .stat-num {
      font-size: 30px;
      font-weight: 800;
      color: var(--primary-color);
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-sub);
      margin-top: 4px;
    }

    /* 关于我们 & 平台介绍 */
    .about-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .model-tag {
      background: rgba(124, 58, 237, 0.05);
      border: 1px solid rgba(124, 58, 237, 0.15);
      color: var(--primary-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
    }

    /* AIGC 服务与场景 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .service-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

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

    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--primary-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: bold;
      margin-bottom: 18px;
    }

    .service-card h3 {
      font-size: 18px;
      color: var(--text-main);
      margin-bottom: 10px;
    }

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

    /* 行业方案与网络 */
    .net-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }

    .net-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 24px;
      border-left: 4px solid var(--primary-color);
      box-shadow: var(--shadow-sm);
    }

    /* 标准流程 */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }

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

    .step-num {
      width: 40px;
      height: 40px;
      background: rgba(124, 58, 237, 0.1);
      color: var(--primary-color);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      margin: 0 auto 15px auto;
    }

    /* 案例展示 */
    .banner-media-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

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

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

    .media-caption {
      padding: 14px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      text-align: center;
    }

    /* 对比评测 */
    .eval-box {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 35px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    .score-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, rgba(124, 58, 237, 0.08) 0%, rgba(236, 72, 153, 0.08) 100%);
      padding: 20px 30px;
      border-radius: var(--radius-md);
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 15px;
    }

    .score-info {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .stars {
      color: #f59e0b;
      font-size: 22px;
      letter-spacing: 2px;
    }

    .score-val {
      font-size: 28px;
      font-weight: 900;
      color: var(--primary-color);
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

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

    .compare-table th {
      background: #f1f5f9;
      color: var(--text-main);
      font-weight: 700;
    }

    .compare-table td.highlight {
      color: var(--primary-color);
      font-weight: 700;
      background: rgba(124, 58, 237, 0.03);
    }

    /* Token 比价 */
    .token-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 18px;
    }

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

    .token-price {
      font-size: 22px;
      font-weight: 800;
      color: #10b981;
      margin: 10px 0;
    }

    /* 客户评论 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
    }

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

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 900px;
      margin: 0 auto;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-main);
      user-select: none;
    }

    .faq-answer {
      padding: 0 24px 18px 24px;
      color: var(--text-sub);
      font-size: 14px;
      display: none;
      line-height: 1.6;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    .faq-toggle-icon {
      font-weight: bold;
      color: var(--primary-color);
    }

    /* 表单及联系方式 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

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

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

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      background: #f8fafc;
      transition: border 0.2s;
    }

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

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      font-size: 14px;
      margin-top: 15px;
    }

    .qr-wrap {
      margin-top: 15px;
      text-align: center;
      width: 150px;
    }

    .qr-wrap img {
      width: 130px;
      height: 130px;
      object-fit: cover;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    /* 文章列表 & 友情链接 */
    .article-links, .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 15px;
    }

    .article-links a, .friend-links a {
      background: rgba(124, 58, 237, 0.05);
      color: var(--primary-color);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
      text-decoration: none;
      transition: background 0.2s;
    }

    .article-links a:hover, .friend-links a:hover {
      background: rgba(124, 58, 237, 0.15);
    }

    /* 页脚 */
    footer.footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 40px 0 20px 0;
      font-size: 13px;
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      border-bottom: 1px solid #1e293b;
      padding-bottom: 20px;
      margin-bottom: 20px;
    }

    .footer-logo {
      color: #ffffff;
      font-size: 18px;
      font-weight: 800;
    }

    .footer-copy {
      text-align: center;
      color: #64748b;
    }

    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 25px;
      bottom: 30px;
      z-index: 999;
      background: var(--primary-gradient);
      color: #ffffff;
      padding: 12px 20px;
      border-radius: 30px;
      box-shadow: 0 10px 25px rgba(124, 58, 237, 0.4);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      font-size: 14px;
      font-weight: 600;
    }

    @media (max-width: 900px) {
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-lg);
      }
      .nav-links.show {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .hero-title {
        font-size: 28px;
      }
    }