:root {
      --primary: #ff5e7e;
      --primary-light: #fff0f3;
      --secondary: #4a69bd;
      --accent-yellow: #f8c291;
      --accent-cyan: #00d2d3;
      --accent-purple: #6c5ce7;
      --text-main: #2d3436;
      --text-muted: #636e72;
      --bg-light: #fbfbfd;
      --card-bg: #ffffff;
      --border-color: #f0f2f5;
      --candy-gradient: linear-gradient(135deg, #ff7675 0%, #fd79a8 50%, #a29bfe 100%);
      --soft-shadow: 0 10px 30px rgba(253, 121, 168, 0.08);
      --hover-shadow: 0 15px 35px rgba(108, 92, 231, 0.15);
      --radius-sm: 8px;
      --radius-md: 16px;
      --radius-lg: 24px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid #f1f2f6;
      transition: all 0.3s ease;
    }

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

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

    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

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

    .nav-links a {
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
      transition: color 0.2s, background-color 0.2s;
    }

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

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

    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      color: #ffffff;
      background: var(--candy-gradient);
      border-radius: 50px;
      box-shadow: 0 4px 15px rgba(255, 118, 117, 0.3);
      transition: transform 0.2s, box-shadow 0.2s;
      border: none;
      cursor: pointer;
    }

    .btn-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 118, 117, 0.4);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 14px;
      font-weight: 600;
      color: var(--accent-purple);
      border: 1.5px solid var(--accent-purple);
      border-radius: 50px;
      background: transparent;
      transition: all 0.2s;
    }

    .btn-outline:hover {
      background: #f4f2ff;
      transform: translateY(-2px);
    }

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

    /* Hero 首屏（严禁图片） */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 10% 20%, rgba(255, 230, 235, 0.7) 0%, rgba(240, 243, 255, 0.8) 90%);
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid rgba(255, 118, 117, 0.2);
      border-radius: 50px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
      box-shadow: var(--soft-shadow);
    }

    .hero-title {
      font-size: 42px;
      font-weight: 800;
      color: #1a1a1a;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

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

    .hero-desc {
      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;
      gap: 16px;
      margin-bottom: 48px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 960px;
      margin: 0 auto;
    }

    .stat-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--soft-shadow);
      border: 1px solid var(--border-color);
      transition: transform 0.3s ease;
    }

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

    .stat-val {
      font-size: 28px;
      font-weight: 800;
      color: var(--accent-purple);
      margin-bottom: 4px;
    }

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

    /* 模块通用样式 */
    .section-block {
      padding: 80px 0;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      color: var(--accent-purple);
      text-transform: uppercase;
      letter-spacing: 1px;
      background: #efeefd;
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 12px;
    }

    .section-heading {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

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

    /* 平台矩阵标签条 */
    .model-pills-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .pill-item {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      padding: 6px 14px;
      border-radius: 50px;
      font-size: 13px;
      font-weight: 500;
      color: #4a5568;
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: all 0.2s;
    }

    .pill-item:hover {
      border-color: var(--accent-purple);
      color: var(--accent-purple);
      background: #f8f7ff;
    }

    /* 服务能力与场景网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-md);
      box-shadow: var(--soft-shadow);
      border: 1px solid var(--border-color);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--hover-shadow);
      border-color: #ffd8e4;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--primary-light);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 22px;
      color: var(--primary);
    }

    .service-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    /* 对比评测板块 */
    .compare-section {
      background: #ffffff;
      border-top: 1px solid #f0f2f5;
      border-bottom: 1px solid #f0f2f5;
    }

    .compare-score-board {
      background: linear-gradient(135deg, #fff5f7 0%, #f4f6ff 100%);
      border: 1px solid #fcdde6;
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-left h3 {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

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

    .score-right {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }

    .score-num {
      font-size: 48px;
      font-weight: 900;
      color: var(--primary);
    }

    .score-star {
      color: #ff9f43;
      font-size: 20px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      border-radius: var(--radius-md);
      box-shadow: var(--soft-shadow);
      border: 1px solid var(--border-color);
    }

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

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #edf2f7;
      font-size: 14px;
    }

    .compare-table th {
      background: #f8fafc;
      font-weight: 600;
      color: #4a5568;
    }

    .compare-table tr:hover td {
      background: #fafbff;
    }

    .highlight-cell {
      font-weight: 600;
      color: var(--primary);
      background: #fffafa;
    }

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

    .step-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--soft-shadow);
      position: relative;
    }

    .step-badge {
      font-size: 12px;
      font-weight: 700;
      color: var(--accent-purple);
      background: #f1f0ff;
      padding: 3px 8px;
      border-radius: 6px;
      display: inline-block;
      margin-bottom: 12px;
    }

    .step-card h4 {
      font-size: 16px;
      margin-bottom: 8px;
      color: var(--text-main);
    }

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

    /* 案例中心 */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .case-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--soft-shadow);
      border: 1px solid var(--border-color);
      transition: transform 0.3s;
    }

    .case-item:hover {
      transform: translateY(-4px);
    }

    .case-img-box {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #edf2f7;
      overflow: hidden;
    }

    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .case-content {
      padding: 20px;
    }

    .case-content h4 {
      font-size: 17px;
      margin-bottom: 8px;
      color: var(--text-main);
    }

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

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--soft-shadow);
      display: flex;
      flex-direction: column;
    }

    .review-quote {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .review-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f2f6;
      padding-top: 12px;
    }

    .reviewer-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--candy-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
    }

    .reviewer-info h5 {
      font-size: 14px;
      color: var(--text-main);
    }

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

    /* FAQ 折叠面板 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      box-shadow: var(--soft-shadow);
      overflow: hidden;
    }

    .faq-header {
      padding: 18px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      user-select: none;
    }

    .faq-header::after {
      content: '+';
      font-size: 18px;
      color: var(--primary);
      transition: transform 0.2s;
    }

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

    .faq-body {
      padding: 0 20px 18px;
      display: none;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

    /* 需求表单与联系我们 */
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: start;
    }

    .form-box {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius-lg);
      box-shadow: var(--soft-shadow);
      border: 1px solid var(--border-color);
    }

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

    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #dfe4ea;
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: #fafafa;
      transition: border-color 0.2s;
      outline: none;
    }

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

    .info-box {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius-lg);
      box-shadow: var(--soft-shadow);
      border: 1px solid var(--border-color);
    }

    .info-list-item {
      display: flex;
      gap: 14px;
      margin-bottom: 20px;
    }

    .info-qrcode-wrap {
      margin-top: 24px;
      display: flex;
      gap: 20px;
      align-items: center;
    }

    .info-qrcode-wrap img {
      width: 110px;
      height: 110px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      display: block;
    }

    .articles-box {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      margin-top: 30px;
    }

    .articles-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .articles-list a {
      font-size: 14px;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 8px;
    }

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

    /* 底部通用区域 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid #eef0f3;
      padding: 40px 0 24px;
      color: var(--text-main);
    }

    .footer-content {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 30px;
    }

    .footer-desc {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 12px;
      max-width: 360px;
    }

    .footer-links-group h5 {
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .footer-links-list a {
      font-size: 13px;
      color: var(--text-muted);
    }

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

    .footer-bottom {
      text-align: center;
      padding-top: 20px;
      border-top: 1px solid #f1f2f6;
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 浮动客服入口 */
    .float-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: 0 4px 15px rgba(0,0,0,0.12);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 18px;
      cursor: pointer;
      border: 1px solid #f0f2f5;
      transition: all 0.2s;
    }

    .float-btn:hover {
      background: var(--candy-gradient);
      color: #ffffff;
      transform: scale(1.08);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .services-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .workflow-steps, .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-container, .case-gallery-grid {
        grid-template-columns: 1fr;
      }
      .footer-content {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid #eee;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
    }

    @media (max-width: 576px) {
      .hero-title {
        font-size: 28px;
      }
      .services-grid, .reviews-grid, .workflow-steps, .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .hero-actions {
        flex-direction: column;
      }
      .nav-actions {
        display: none;
      }
    }