:root {
      --primary: #4f46e5;
      --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #ec4899 50%, #f59e0b 100%);
      --accent-cyan: #06b6d4;
      --accent-pink: #ec4899;
      --accent-orange: #f97316;
      --accent-purple: #8b5cf6;
      --bg-light: #f8fafc;
      --card-bg: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 10px 25px -5px rgba(79, 70, 229, 0.08), 0 8px 10px -6px rgba(236, 72, 153, 0.04);
      --shadow-hover: 0 20px 30px -10px rgba(79, 70, 229, 0.18);
      --radius-lg: 18px;
      --radius-md: 12px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background: radial-gradient(circle at 10% 20%, rgba(244, 63, 94, 0.05) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(79, 70, 229, 0.06) 0%, transparent 40%),
                  #f8fafc;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

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

    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
    }

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

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-weight: 600;
      font-size: 15px;
      color: var(--text-main);
      transition: color 0.2s ease;
      border-radius: 6px;
    }

    .nav-links li a:hover {
      color: var(--accent-pink);
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      padding: 10px 22px;
      font-weight: 700;
      font-size: 14px;
      color: #ffffff !important;
      background: var(--primary-gradient);
      border-radius: 50px;
      box-shadow: 0 4px 15px rgba(236, 72, 153, 0.3);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(236, 72, 153, 0.45);
    }

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

    /* 醒目通用标题与角标 */
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px;
    }

    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      font-size: 13px;
      font-weight: 700;
      color: #ffffff;
      background: var(--primary-gradient);
      border-radius: 30px;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 首屏 HERO 纯 CSS 科技感，严禁任何图片 */
    .hero-section {
      padding: 70px 0 60px;
      position: relative;
    }

    .hero-inner {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(79, 70, 229, 0.1);
      border: 1px solid rgba(79, 70, 229, 0.2);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      color: #0f172a;
    }

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

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

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

    .btn-main-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 15px 36px;
      font-size: 17px;
      font-weight: 800;
      color: #ffffff;
      background: var(--primary-gradient);
      border-radius: 50px;
      box-shadow: 0 10px 25px rgba(236, 72, 153, 0.35);
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
    }

    .btn-main-action:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 15px 30px rgba(236, 72, 153, 0.5);
    }

    .btn-outline-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 15px 32px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: 50px;
      transition: all 0.2s ease;
    }

    .btn-outline-action:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(79, 70, 229, 0.04);
    }

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

    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s;
    }

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

    .stat-num {
      font-size: 32px;
      font-weight: 900;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
    }

    /* 平台介绍与模型矩阵 */
    .section-padding {
      padding: 60px 0;
    }

    .feature-tags-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-bottom: 40px;
    }

    .model-tag {
      padding: 8px 18px;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s;
    }

    .model-tag:hover {
      border-color: var(--accent-pink);
      color: var(--accent-pink);
      transform: translateY(-2px);
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

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

    .service-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: var(--primary-gradient);
      opacity: 0;
      transition: opacity 0.3s;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(236, 72, 153, 0.3);
    }

    .service-card:hover::before {
      opacity: 1;
    }

    .card-icon-box {
      width: 54px;
      height: 54px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(236, 72, 153, 0.1));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      color: var(--primary);
      margin-bottom: 20px;
      font-weight: 800;
    }

    .card-title {
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 对比评测卡片与评分 */
    .review-score-panel {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      box-shadow: var(--shadow-md);
    }

    .score-left h3 {
      font-size: 28px;
      font-weight: 800;
      margin-bottom: 8px;
      color: #ffffff;
    }

    .score-left p {
      font-size: 15px;
      color: #cbd5e1;
    }

    .score-right {
      text-align: right;
    }

    .score-badge-stars {
      color: #fbbf24;
      font-size: 24px;
      margin-bottom: 6px;
    }

    .score-number {
      font-size: 46px;
      font-weight: 900;
      line-height: 1;
      color: #ffffff;
    }

    .score-max {
      font-size: 18px;
      color: #94a3b8;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .comparison-table th, .comparison-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }

    .comparison-table th {
      background: #f1f5f9;
      font-weight: 800;
      font-size: 15px;
      color: var(--text-main);
    }

    .comparison-table td {
      font-size: 14px;
      color: var(--text-muted);
    }

    .comparison-table tr:last-child td {
      border-bottom: none;
    }

    .highlight-cell {
      font-weight: 700;
      color: var(--primary);
      background: rgba(79, 70, 229, 0.03);
    }

    /* 案例展示画廊 */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
    }

    .case-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .case-img-wrap {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

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

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

    .case-content {
      padding: 22px;
    }

    .case-content h4 {
      font-size: 18px;
      font-weight: 800;
      margin-bottom: 8px;
      color: var(--text-main);
    }

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

    /* 流程步骤 */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

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

    .step-badge {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 800;
      font-size: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
    }

    .step-item h4 {
      font-size: 17px;
      font-weight: 800;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .step-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 客户评价 */
    .testimonial-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .testi-avatar {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 18px;
    }

    .testi-name {
      font-weight: 800;
      font-size: 16px;
      color: var(--text-main);
    }

    .testi-role {
      font-size: 13px;
      color: var(--text-muted);
    }

    .testi-quote {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.6;
    }

    .testi-stars {
      color: #f59e0b;
      margin-top: 14px;
      font-size: 14px;
    }

    /* 需求表单与加盟 */
    .form-wrapper-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
      margin-bottom: 18px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group.full-width {
      grid-column: span 2;
    }

    .form-group label {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      color: var(--text-main);
      background: #f8fafc;
      outline: none;
      transition: border-color 0.2s;
    }

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

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

    .btn-submit-form {
      width: 100%;
      padding: 14px;
      background: var(--primary-gradient);
      color: #ffffff;
      font-size: 16px;
      font-weight: 800;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      box-shadow: 0 4px 15px rgba(236, 72, 153, 0.3);
      transition: all 0.2s;
    }

    .btn-submit-form:hover {
      box-shadow: 0 6px 20px rgba(236, 72, 153, 0.45);
      transform: translateY(-2px);
    }

    /* FAQ 折叠 */
    .faq-container {
      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: var(--radius-md);
      overflow: hidden;
      transition: all 0.2s ease;
    }

    .faq-header-btn {
      width: 100%;
      padding: 18px 24px;
      background: none;
      border: none;
      text-align: left;
      font-size: 16px;
      font-weight: 800;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

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

    .faq-icon-arrow {
      font-size: 14px;
      transition: transform 0.3s ease;
      color: var(--text-muted);
    }

    .faq-content-body {
      display: none;
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .faq-item.active .faq-content-body {
      display: block;
    }

    .faq-item.active .faq-icon-arrow {
      transform: rotate(180deg);
      color: var(--accent-pink);
    }

    /* 最新文章与资讯 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .art-link-card {
      background: #ffffff;
      padding: 16px 20px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      font-weight: 700;
      font-size: 14px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.2s;
    }

    .art-link-card:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateX(4px);
    }

    /* 联系我们与二维码展示 */
    .contact-card-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 24px;
      align-items: center;
    }

    .contact-info-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
    }

    .contact-list-item {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 20px;
      font-size: 15px;
      color: var(--text-main);
    }

    .contact-icon-mini {
      width: 40px;
      height: 40px;
      border-radius: 10px;
      background: rgba(79, 70, 229, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }

    .qr-showcase {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      text-align: center;
    }

    .qr-img-box {
      max-width: 180px;
      margin-bottom: 14px;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    .qr-img-box img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 友情链接与页脚 */
    .friendly-links-section {
      background: #f1f5f9;
      border-top: 1px solid var(--border-color);
      padding: 28px 0;
    }

    .friendly-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .friendly-label {
      font-weight: 800;
      font-size: 14px;
      color: var(--text-main);
    }

    .friendly-links-wrap a {
      font-size: 13px;
      color: var(--text-muted);
      background: #ffffff;
      padding: 4px 12px;
      border-radius: 6px;
      border: 1px solid #cbd5e1;
      transition: all 0.2s;
    }

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

    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 40px 0 30px;
      font-size: 14px;
      border-top: 1px solid #1e293b;
    }

    .footer-content-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      margin-bottom: 24px;
      padding-bottom: 24px;
      border-bottom: 1px solid #334155;
    }

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

    .footer-bottom-bar {
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* 浮动客服 */
    .float-kefu-btn {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      background: var(--primary-gradient);
      color: #ffffff;
      padding: 12px 20px;
      border-radius: 50px;
      font-weight: 800;
      font-size: 14px;
      box-shadow: 0 8px 20px rgba(236, 72, 153, 0.4);
      display: flex;
      align-items: center;
      gap: 8px;
      cursor: pointer;
      transition: transform 0.2s;
    }

    .float-kefu-btn:hover {
      transform: scale(1.06);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .grid-3, .grid-4, .hero-stats-grid, .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-gallery-grid {
        grid-template-columns: 1fr;
      }
      .contact-card-grid {
        grid-template-columns: 1fr;
      }
      .article-links-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        position: absolute;
        top: 70px;
        left: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-cta {
        display: none;
      }
      .hero-title {
        font-size: 30px;
      }
      .grid-3, .grid-4, .grid-2, .hero-stats-grid, .flow-steps, .form-grid, .article-links-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .review-score-panel {
        flex-direction: column;
        text-align: center;
        gap: 20px;
      }
      .score-right {
        text-align: center;
      }
    }