/* 全局变量与潮流浅色调主题 */
    :root {
      --primary-color: #6366f1;
      --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
      --accent-color: #ec4899;
      --bg-color: #f8fafc;
      --card-bg: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
      --shadow-lg: 0 20px 25px -5px rgba(99, 102, 241, 0.1), 0 10px 10px -5px rgba(99, 102, 241, 0.04);
      --radius: 14px;
      --container-width: 1200px;
    }

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

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

    a {
      color: var(--primary-color);
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

    /* 统一标准容器 */
    .ai-container {
      width: 92%;
      max-width: var(--container-width);
      margin: 0 auto;
    }

    .section-title-wrap {
      text-align: center;
      margin-bottom: 40px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(99, 102, 241, 0.1);
      color: var(--primary-color);
      font-weight: 600;
      font-size: 13px;
      border-radius: 20px;
      margin-bottom: 10px;
      letter-spacing: 1px;
    }

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

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto;
    }

    /* 顶部导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }

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

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

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

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 严格要求的 CSS 规则：.nav-links gap必须为0 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
      gap: 0;
    }

    .nav-links li {
      margin: 0;
      padding: 0;
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      border-radius: 8px;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      border: none;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
    }

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

    .btn-outline:hover {
      background: rgba(99, 102, 241, 0.06);
    }

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

    /* 首屏 HERO 区域 - 严禁出现图片 */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 20%, rgba(168, 85, 247, 0.12) 0%, rgba(99, 102, 241, 0.05) 50%, rgba(248, 250, 252, 1) 100%);
      text-align: center;
      position: relative;
    }

    .hero-badge-wrap {
      display: flex;
      justify-content: center;
      gap: 10px;
      margin-bottom: 20px;
      flex-wrap: wrap;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid rgba(99, 102, 241, 0.2);
      border-radius: 50px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary-color);
      box-shadow: var(--shadow-sm);
    }

    .hero-h1 {
      font-size: 40px;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-h1 span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
    }

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

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }

    .stat-card {
      background: rgba(255, 255, 255, 0.85);
      border: 1px solid var(--border-color);
      padding: 24px 16px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease;
    }

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

    .stat-number {
      font-size: 32px;
      font-weight: 900;
      color: var(--primary-color);
    }

    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* 常规 Section 块级定义 */
    .section-block {
      padding: 70px 0;
      border-bottom: 1px solid #f1f5f9;
    }

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

    /* 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: linear-gradient(145deg, #ffffff, #f1f5f9);
      border: 1px solid var(--border-color);
      padding: 36px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-lg);
    }

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

    .feature-check-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 15px;
      color: var(--text-main);
    }

    .feature-check-list li::before {
      content: "✓";
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 22px;
      height: 22px;
      background: var(--primary-color);
      color: #fff;
      border-radius: 50%;
      font-size: 12px;
      font-weight: bold;
    }

    /* AIGC 服务卡片矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
      gap: 20px;
    }

    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: var(--radius);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

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

    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(236,72,153,0.1));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 16px;
    }

    .service-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 8px;

    }

    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 行业方案与流程 */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }

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

    .process-num {
      width: 36px;
      height: 36px;
      background: var(--primary-gradient);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      margin: 0 auto 12px;
    }

    /* 案例中心展示 */
    .case-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .case-img-wrap {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #e2e8f0;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }

    .case-info {
      padding: 20px;
    }

    .case-info h4 {
      font-size: 17px;
      margin-bottom: 6px;
    }

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

    /* 对比评测 - 5星 9.9分 */
    .rating-header-card {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
    }

    .rating-score-box {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .score-big {
      font-size: 56px;
      font-weight: 900;
      color: #fbbf24;
      line-height: 1;
    }

    .stars-box {
      color: #fbbf24;
      font-size: 24px;
      letter-spacing: 2px;
    }

    .compare-table-wrap {
      overflow-x: auto;
      background: #fff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }

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

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
    }

    .compare-table tr:hover {
      background: rgba(99,102,241,0.02);
    }

    .highlight-col {
      background: rgba(99, 102, 241, 0.05);
      font-weight: 600;
      color: var(--primary-color);
    }

    /* Token 比价表 */
    .token-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
    }

    .token-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }

    .token-card-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 12px;
    }

    .token-model-name {
      font-size: 16px;
      font-weight: 700;
    }

    .token-price-tag {
      color: #10b981;
      font-weight: 700;
      font-size: 15px;
    }

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

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

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

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

    .user-info h5 {
      font-size: 15px;
    }

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

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #fff;
      user-select: none;
    }

    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: all 0.3s ease;
      color: var(--text-muted);
      font-size: 14px;
    }

    .faq-item.active .faq-answer {
      padding: 0 24px 18px 24px;
      max-height: 200px;
    }

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

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

    /* 表单与联系区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

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

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

    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-weight: 600;
      font-size: 14px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      outline: none;
      transition: border-color 0.25s;
    }

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

    .contact-info-card {
      background: linear-gradient(145deg, #ffffff, #f8fafc);
      border: 1px solid var(--border-color);
      padding: 32px;
      border-radius: var(--radius);
    }

    .qr-box {
      margin-top: 20px;
      text-align: center;
    }

    .qr-box img {
      max-width: 160px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      padding: 6px;
      background: #fff;
    }

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

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

    .footer-brand h4 {
      color: #fff;
      font-size: 20px;
      margin-bottom: 14px;
    }

    .footer-links-col h5 {
      color: #f8fafc;
      font-size: 16px;
      margin-bottom: 16px;
    }

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

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

    .footer-links-col a {
      color: #94a3b8;
    }

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

    .friend-links-wrap {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-top: 30px;
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .friend-links-wrap span {
      color: #64748b;

    }

    .friend-links-wrap a {
      color: #94a3b8;
      font-size: 13px;
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      color: #64748b;
      font-size: 13px;
    }

    /* 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: 12px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: 0 4px 16px rgba(0,0,0,0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: transform 0.25s;
      border: 1px solid var(--border-color);
    }

    .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);
      }
      .about-grid, .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-gallery, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }

      .nav-links.active {
        display: flex;
      }

      .mobile-menu-btn {
        display: block;
      }

      .hero-h1 {
        font-size: 28px;
      }

      .process-steps, .case-gallery, .testimonials-grid {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }

      .rating-header-card {
        flex-direction: column;
        text-align: center;
        gap: 20px;
      }
    }