:root {
      --bg-main: #f8fafc;
      --bg-alt: #f1f5f9;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --neon-cyan: #06b6d4;
      --neon-purple: #8b5cf6;
      --neon-pink: #ec4899;
      --neon-blue: #3b82f6;
      --neon-gradient: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 50%, #ec4899 100%);
      --neon-glow: 0 4px 20px rgba(139, 92, 246, 0.15);
      --border-color: #e2e8f0;
      --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
      --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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

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

    /* 统一全局容器规范 */
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航栏 */
    .site-header {
      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, 0.03);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
    }

    .brand-logo img.ai-page-logo {
      max-height: 38px;
      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;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 14px;
      font-weight: 500;
      transition: all 0.25s ease;
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--neon-purple);
      background: rgba(139, 92, 246, 0.06);
    }

    .nav-action-btn {
      background: var(--neon-gradient);
      color: #ffffff !important;
      padding: 8px 18px !important;
      border-radius: 30px !important;
      font-weight: 600 !important;
      box-shadow: 0 2px 10px rgba(139, 92, 246, 0.25);
    }

    .nav-action-btn:hover {
      opacity: 0.92;
      transform: translateY(-1px);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 6px 10px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-size: 18px;
    }

    /* 区域通用排版 */
    .section-padding {
      padding: 70px 0;
    }

    .section-alt {
      background-color: var(--bg-alt);
    }

    .section-title-wrap {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 45px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(139, 92, 246, 0.1);
      border: 1px solid rgba(139, 92, 246, 0.25);
      color: var(--neon-purple);
      border-radius: 20px;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.5px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
    }

    /* 首屏 HERO 区域（无图片纯设计） */
    .hero-section {
      background: radial-gradient(circle at 50% 0%, rgba(6, 182, 212, 0.12) 0%, rgba(139, 92, 246, 0.08) 40%, rgba(248, 250, 252, 0) 70%);
      padding: 80px 0 60px 0;
      text-align: center;
      position: relative;
    }

    .hero-badge-glow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid #e0e7ff;
      box-shadow: 0 4px 15px rgba(99, 102, 241, 0.08);
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      color: var(--neon-purple);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .hero-title .text-neon {
      background: var(--neon-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-lead {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 35px auto;
      line-height: 1.65;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 15px;
      font-weight: 700;
      border-radius: 30px;
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
      border: 1px solid transparent;
    }

    .btn-primary-neon {
      background: var(--neon-gradient);
      color: #ffffff;
      box-shadow: 0 4px 20px rgba(139, 92, 246, 0.35);
    }

    .btn-primary-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 25px rgba(236, 72, 153, 0.4);
    }

    .btn-secondary-light {
      background: #ffffff;
      border-color: #cbd5e1;
      color: var(--text-main);
    }

    .btn-secondary-light:hover {
      background: #f8fafc;
      border-color: var(--neon-purple);
      color: var(--neon-purple);
    }

    /* 首屏数据指标卡片 */
    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      transition: transform 0.25s ease;
    }

    .metric-card:hover {
      transform: translateY(-3px);
      border-color: var(--neon-cyan);
    }

    .metric-value {
      font-size: 30px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 13px;
      color: var(--text-light);
      font-weight: 500;
    }

    /* 支持模型滚动标签云 */
    .model-chips-wrap {
      margin-top: 35px;
      padding: 14px 20px;
      background: rgba(255, 255, 255, 0.7);
      border: 1px dashed #cbd5e1;
      border-radius: var(--radius-md);
      text-align: center;
    }

    .model-chips-title {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 10px;
    }

    .model-chips {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      justify-content: center;
    }

    .chip-item {
      font-size: 12px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      padding: 4px 10px;
      border-radius: 16px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 网格布局标准 */
    .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;
    }

    /* 服务卡片 */
    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--card-shadow);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-4px);
      border-color: rgba(139, 92, 246, 0.4);
      box-shadow: 0 15px 30px -10px rgba(139, 92, 246, 0.15);
    }

    .service-card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(139, 92, 246, 0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 18px;
      color: var(--neon-purple);
    }

    .service-card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .service-card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
      margin-bottom: 16px;
    }

    .service-tag {
      font-size: 12px;
      color: var(--neon-cyan);
      font-weight: 600;
    }

    /* 标准流程时间线 */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }

    .flow-step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 18px;
      text-align: center;
      position: relative;
      box-shadow: var(--card-shadow);
    }

    .step-badge {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--neon-gradient);
      color: #ffffff;
      font-weight: 800;
      font-size: 15px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 14px auto;
    }

    .step-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

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

    /* 对比评测表格与卡片 */
    .eval-highlight-box {
      background: #ffffff;
      border: 2px solid #e0e7ff;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--neon-glow);
      margin-bottom: 30px;
    }

    .eval-score-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      padding-bottom: 20px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 24px;
    }

    .score-badge-box {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .score-big {
      font-size: 40px;
      font-weight: 900;
      color: var(--neon-purple);
      line-height: 1;
    }

    .score-stars {
      color: #f59e0b;
      font-size: 18px;
      letter-spacing: 2px;
    }

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

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

    .eval-table th, .eval-table td {
      padding: 14px 16px;
      border-bottom: 1px solid #f1f5f9;
    }

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

    .eval-table tr:hover td {
      background-color: rgba(248, 250, 252, 0.8);
    }

    .tag-success {
      color: #10b981;
      font-weight: 700;
    }

    .tag-normal {
      color: var(--text-muted);
    }

    /* 案例与素材图展示 */
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }

    .case-img-wrap {
      width: 100%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .case-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }

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

    .case-content {
      padding: 20px;
    }

    .case-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .case-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 客户评论卡片 */
    .comment-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .comment-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #06b6d4, #8b5cf6);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }

    .comment-user-name {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .comment-user-role {
      font-size: 12px;
      color: var(--text-light);
    }

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

    /* FAQ 折叠手风琴 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-question {
      padding: 18px 22px;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      transition: background-color 0.2s ease;
    }

    .faq-question:hover {
      background-color: #f8fafc;
    }

    .faq-toggle-icon {
      font-size: 18px;
      font-weight: 400;
      color: var(--neon-purple);
      transition: transform 0.2s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 22px 18px 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px solid #f8fafc;
    }

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

    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }

    /* 需求表单与联系我们 */
    .contact-form-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      align-items: start;
    }

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

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

    .contact-item-row {
      display: flex;
      gap: 12px;
      margin-bottom: 18px;
      font-size: 14px;
      color: var(--text-muted);
    }

    .contact-qr-box {
      margin-top: 24px;
      padding-top: 20px;
      border-top: 1px solid var(--border-color);
      text-align: center;
    }

    .contact-qr-box img {
      max-width: 140px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      padding: 4px;
      background: #ffffff;
    }

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

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

    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

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

    .form-control:focus {
      border-color: var(--neon-purple);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 资讯文章与链接列表 */
    .article-list-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
    }

    .article-links {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-link-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      text-decoration: none;
      padding: 10px 14px;
      background: #f8fafc;
      border-radius: var(--radius-sm);
      color: var(--text-main);
      font-size: 14px;
      font-weight: 500;
      transition: all 0.2s ease;
    }

    .article-link-item:hover {
      background: rgba(139, 92, 246, 0.08);
      color: var(--neon-purple);
      transform: translateX(4px);
    }

    /* 友情链接与底栏 */
    .friend-links-box {
      margin-top: 40px;
      padding: 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }

    .friend-links-title {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links-list a {
      font-size: 13px;
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s;
    }

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

    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 40px 0 25px 0;
      color: var(--text-muted);
      font-size: 13px;
    }

    .footer-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }

    .footer-links-group {
      display: flex;
      gap: 20px;
    }

    .footer-links-group a {
      color: var(--text-muted);
      text-decoration: none;
    }

    .footer-links-group a:hover {
      color: var(--neon-purple);
    }

    /* 悬浮客服面板与返回顶部 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--neon-purple);
      font-size: 20px;
      transition: all 0.25s ease;
      position: relative;
    }

    .float-btn:hover {
      transform: scale(1.08);
      border-color: var(--neon-purple);
    }

    .float-qr-hover {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-md);
      box-shadow: 0 10px 30px rgba(0,0,0,0.15);
      border: 1px solid var(--border-color);
      width: 150px;
      text-align: center;
    }

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

    .float-btn-kefu:hover .float-qr-hover {
      display: block;
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .grid-4, .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-form-layout {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
      .grid-3, .grid-2, .grid-4, .hero-metrics-grid, .flow-steps {
        grid-template-columns: 1fr;
      }
      .eval-score-header {
        flex-direction: column;
        align-items: flex-start;
      }
    }