/* 全局重置与变量 */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --primary: #5B3CF6;
      --primary-light: #EAE4FF;
      --primary-dark: #3D28C0;
      --secondary: #00C9A7;
      --secondary-light: #D6FFF7;
      --accent: #FF7A45;
      --accent-light: #FFF0E8;
      --dark: #1A1D29;
      --gray: #5D6078;
      --gray-light: #F6F7FB;
      --white: #FFFFFF;
      --border: #E8EAF1;
      --shadow-sm: 0 4px 12px rgba(91, 60, 246, 0.06);
      --shadow-md: 0 12px 32px rgba(91, 60, 246, 0.10);
      --shadow-lg: 0 24px 64px rgba(91, 60, 246, 0.12);
      --radius-sm: 10px;
      --radius-md: 18px;
      --radius-lg: 28px;
      --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
      background: linear-gradient(145deg, #F8F7FF 0%, #F0F3FF 40%, #FDF8FF 100%);
      color: var(--dark);
      line-height: 1.65;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }

    /* 主容器统一宽度体系 */
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 文字与标题 */
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
      color: var(--dark);
      letter-spacing: -0.01em;
    }

    h1 {
      font-size: clamp(2.2rem, 5vw, 3.6rem);
    }

    h2 {
      font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    }

    h3 {
      font-size: clamp(1.2rem, 2vw, 1.5rem);
    }

    p {
      color: var(--gray);
    }

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

    /* 通用按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 32px;
      border-radius: 60px;
      font-weight: 600;
      font-size: 1rem;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #7B5CFF 100%);
      color: #fff;
      box-shadow: 0 8px 24px rgba(91, 60, 246, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-3px);
      box-shadow: 0 16px 36px rgba(91, 60, 246, 0.4);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: var(--secondary);
      color: #fff;
      box-shadow: 0 8px 20px rgba(0, 201, 167, 0.28);
    }

    .btn-secondary:hover {
      transform: translateY(-3px);
      background: #00B394;
      box-shadow: 0 14px 28px rgba(0, 201, 167, 0.36);
    }

    .btn-sm {
      padding: 10px 22px;
      font-size: 0.9rem;
    }

    /* 卡片通用 */
    .card {
      background: var(--white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      padding: 28px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: transparent;
    }

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.82);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(232, 234, 241, 0.7);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 0;
      gap: 16px;
    }

    .logo-wrap {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .ai-page-logo {
      height: 44px;
      width: auto;
      display: block;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0; /* 按要求gap为0 */
      list-style: none;
      flex: 1;
      justify-content: flex-end;
      flex-wrap: nowrap;
      overflow-x: auto;
      padding: 0 8px;
    }

    .nav-links li {
      flex-shrink: 0;
    }

    .nav-links a {
      display: block;
      padding: 8px 14px;
      font-size: 0.88rem;
      font-weight: 500;
      color: var(--gray);
      border-radius: 8px;
      white-space: nowrap;
      transition: var(--transition);
    }

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

    .nav-cta {
      flex-shrink: 0;
      margin-left: 4px;
    }

    .nav-cta .btn-sm {
      padding: 9px 20px;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.7rem;
      color: var(--dark);
      cursor: pointer;
      padding: 4px 8px;
      line-height: 1;
      flex-shrink: 0;
    }

    /* Hero 首屏 */
    .hero {
      position: relative;
      padding: 80px 0 72px;
      overflow: hidden;
      background: radial-gradient(circle at 20% 30%, rgba(91, 60, 246, 0.08) 0%, transparent 55%),
                  radial-gradient(circle at 85% 70%, rgba(0, 201, 167, 0.08) 0%, transparent 50%),
                  transparent;
    }

    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(91, 60, 246, 0.04) 0%, transparent 60%);
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.05fr 0.95fr;
      gap: 48px;
      align-items: center;
      position: relative;
    }

    .hero-content {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--primary-light);
      color: var(--primary-dark);
      padding: 6px 18px;
      border-radius: 100px;
      font-size: 0.82rem;
      font-weight: 600;
      letter-spacing: 0.02em;
      align-self: flex-start;
      border: 1px solid rgba(91, 60, 246, 0.18);
    }

    .hero-badge .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--secondary);
      animation: pulse-dot 2s infinite;
    }

    @keyframes pulse-dot {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(0.8); }
    }

    .hero h1 {
      font-size: clamp(2% , 4vw, 3.4rem);
      line-height: 1.2;
      background: linear-gradient(135deg, var(--dark) 30%, var(--primary) 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin: 0;
    }

    .hero-desc {
      font-size: 1.1rem;
      color: var(--gray);
      max-width: 540px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      align-items: center;
    }

    .hero-stats {
      display: flex;
      gap: 32px;
      margin-top: 8px;
      flex-wrap: wrap;
    }

    .hero-stat-item {
      display: flex;
      flex-direction: column;
    }

    .hero-stat-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.02em;
      line-height: 1.2;
    }

    .hero-stat-label {
      font-size: 0.85rem;
      color: var(--gray);
      font-weight: 500;
    }

    /* Hero右侧——纯几何/文字面板，无图片 */
    .hero-visual {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      min-height: 380px;
    }

    .floating-panel {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 22px 20px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      gap: 10px;
      animation: float-panel 6s ease-in-out infinite;
    }

    .floating-panel:nth-child(2) {
      animation-delay: 2s;
    }

    .floating-panel:nth-child(3) {
      animation-delay: 4s;
    }

    .floating-panel:hover {
      transform: translateY(-8px) scale(1.02);
      box-shadow: var(--shadow-md);
      border-color: transparent;
    }

    @keyframes float-panel {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-8px); }
    }

    .panel-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      background: var(--primary-light);
      color: var(--primary);
    }

    .panel-title {
      font-weight: 700;
      font-size: 1rem;
      color: var(--dark);
    }

    .panel-text {
      font-size: 0.8rem;
      color: var(--gray);
      line-height: 1.5;
    }

    .panel-grid-alt {
      display: grid;
      gap: 12px;
      grid-column: span 2;
      grid-template-columns: 1fr 1fr;
    }

    .panel-grid-alt .floating-panel {
      animation: none;
      padding: 16px 18px;
    }

    /* 通用区块间距 */
    .section {
      padding: 72px 0;
      position: relative;
    }

    .section-alt {
      background: rgba(255, 255, 255, 0.6);
      backdrop-filter: blur(4px);
      -webkit-backdrop-filter: blur(4px);
      border-top: 1px solid rgba(232, 234, 241, 0.7);
      border-bottom: 1px solid rgba(232, 234, 241, 0.7);
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .section-tag {
      display: inline-block;
      align-self: center;
      background: var(--primary-light);
      color: var(--primary-dark);
      font-size: 0.8rem;
      font-weight: 600;
      padding: 4px 16px;
      border-radius: 100px;
      letter-spacing: 0.04em;
      border: 1px solid rgba(91, 60, 246, 0.15);
    }

    .section-header h2 {
      margin: 0;
    }

    .section-header p {
      font-size: 1.05rem;
      margin: 0;
    }

    /* 数据卡片 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      text-align: center;
      border: 1px solid var(--border);
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }

    .stat-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: transparent;
    }

    .stat-number {
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
      letter-spacing: -0.02em;
    }

    .stat-label {
      font-size: 0.95rem;
      color: var(--gray);
      font-weight: 500;
      margin-top: 4px;
    }

    /* 服务能力卡片网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      border: 1px solid var(--border);
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-light);
    }

    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 14px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 4px;
    }

    .service-card h3 {
      font-size: 1.1rem;
      margin: 0;
    }

    .service-card p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin: 0;
      flex: 1;
    }

    /* 流程步骤 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      counter-reset: step;
    }

    .step-item {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 28px 22px;
      border: 1px solid var(--border);
      text-align: center;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
      position: relative;
    }

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

    .step-num {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, #7B5CFF 100%);
      color: #fff;
      font-weight: 700;
      font-size: 1.2rem;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      box-shadow: 0 6px 16px rgba(91, 60, 246, 0.3);
    }

    .step-item h4 {
      font-size: 1rem;
      margin-bottom: 6px;
    }

    .step-item p {
      font-size: 0.85rem;
      color: var(--gray);
      margin: 0;
    }

    /* 对比表格 */
    .table-responsive {
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      background: var(--white);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 700px;
      font-size: 0.92rem;
    }

    .compare-table thead {
      background: var(--primary-light);
    }

    .compare-table th {
      padding: 16px 20px;
      text-align: left;
      font-weight: 700;
      color: var(--primary-dark);
      font-size: 0.9rem;
      white-space: nowrap;
      border-bottom: 2px solid rgba(91, 60, 246, 0.15);
    }

    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
      color: var(--gray);
      vertical-align: middle;
    }

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

    .compare-table tbody tr:hover {
      background: var(--gray-light);
    }

    .compare-table .highlight {
      color: var(--primary-dark);
      font-weight: 700;
    }

    .rating-stars {
      color: #FFB800;
      font-size: 1.1rem;
      letter-spacing: 2px;
    }

    .rating-score {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
    }

    .rating-total {
      font-size: 0.9rem;
      color: var(--gray);
    }

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

    .review-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      border: 1px solid var(--border);
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

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

    .review-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-light), #D9CFFF);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      flex-shrink: 0;
    }

    .review-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--dark);
    }

    .review-role {
      font-size: 0.8rem;
      color: var(--gray);
    }

    .review-stars {
      color: #FFB800;
      font-size: 0.85rem;
      letter-spacing: 1px;
    }

    .review-text {
      font-size: 0.9rem;
      line-height: 1.65;
      color: var(--gray);
      margin: 0;
      flex: 1;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 820px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--white);
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
      overflow: hidden;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }

    .faq-item:hover {
      border-color: var(--primary-light);
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      padding: 18px 24px;
      cursor: pointer;
      font-weight: 600;
      font-size: 0.98rem;
      color: var(--dark);
      background: transparent;
      border: none;
      width: 100%;
      text-align: left;
      transition: var(--transition);
      font-family: inherit;
    }

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

    .faq-icon {
      font-size: 1.3rem;
      font-weight: 300;
      color: var(--primary);
      transition: transform 0.3s ease;
      flex-shrink: 0;
      width: 24px;
      text-align: center;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 24px;
      color: var(--gray);
      font-size: 0.9rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px;
    }

    /* 案例展示 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--white);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }

    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: transparent;
    }

    .case-img {
      width: 100%;
      aspect-ratio: 16 / 10;
      background: var(--gray-light);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--gray);
      font-size: 0.85rem;
      overflow: hidden;
    }

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

    .case-body {
      padding: 20px 22px;
    }

    .case-body h4 {
      font-size: 1rem;
      margin-bottom: 4px;
    }

    .case-body p {
      font-size: 0.85rem;
      color: var(--gray);
      margin: 0;
    }

    /* 文章列表 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
    }

    .article-item {
      background: var(--white);
      border-radius: var(--radius-sm);
      padding: 20px 24px;
      border: 1px solid var(--border);
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

    .article-item:hover {
      transform: translateX(4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-light);
    }

    .article-title {
      font-weight: 600;
      color: var(--dark);
      font-size: 0.95rem;
    }

    .article-arrow {
      color: var(--primary);
      font-size: 1.2rem;
      flex-shrink: 0;
    }

    /* 表单 */
    .form-wrap {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 40px 36px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-md);
      max-width: 720px;
      margin: 0 auto;
    }

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
      margin-bottom: 18px;
    }

    .form-group label {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--dark);
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 13px 16px;
      border: 1.5px solid var(--border);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      font-family: inherit;
      color: var(--dark);
      background: var(--gray-light);
      transition: var(--transition);
      outline: none;
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--primary);
      background: var(--white);
      box-shadow: 0 0 0 4px rgba(91, 60, 246, 0.08);
    }

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

    .form-submit {
      width: 100%;
      margin-top: 8px;
      padding: 16px;
      font-size: 1rem;
    }

    /* 页脚 */
    .site-footer {
      background: #1A1D29;
      color: #B8BCCC;
      padding: 56px 0 28px;
      margin-top: 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .footer-brand .logo-wrap img {
      height: 38px;
      width: auto;
      
    }

    .footer-brand p {
      color: #9A9EB0;
      font-size: 0.88rem;
      line-height: 1.7;
      margin: 0;
    }

    .footer-contact-item {
      display: flex;
      gap: 10px;
      font-size: 0.85rem;
      color: #B8BCCC;
      align-items: flex-start;
      line-height: 1.6;
    }

    .footer h4 {
      color: #FFFFFF;
      font-size: 0.95rem;
      margin-bottom: 16px;
      font-weight: 700;
    }

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

    .footer-links a {
      color: #9A9EB0;
      font-size: 0.85rem;
      transition: var(--transition);
    }

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

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.8rem;
      color: #7A7E90;
    }

    .footer-qr {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .footer-qr img {
      width: 80px;
      height: 80px;
      border-radius: 10px;
      background: #fff;
      padding: 4px;
      object-fit: contain;
    }

    /* 浮动客服入口 */
    .float-chat {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
      align-items: flex-end;
    }

    .float-btn {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, #7B5CFF 100%);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      cursor: pointer;
      box-shadow: 0 8px 24px rgba(91, 60, 246, 0.4);
      transition: var(--transition);
      border: none;
    }

    .float-btn:hover {
      transform: translateY(-4px) scale(1.06);
      box-shadow: 0 16px 36px rgba(91, 60, 246, 0.5);
    }

    .back-to-top {
      position: fixed;
      right: 24px;
      bottom: 92px;
      z-index: 998;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--white);
      color: var(--primary);
      border: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      cursor: pointer;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      opacity: 0;
      visibility: hidden;
    }

    .back-to-top.show {
      opacity: 1;
      visibility: visible;
    }

    .back-to-top:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    /* 滚动渐入 */
    .fade-in {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .fade-in.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* 标签云 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .tag-item {
      display: inline-block;
      padding: 8px 18px;
      border-radius: 100px;
      background: var(--white);
      border: 1px solid var(--border);
      font-size: 0.82rem;
      color: var(--gray);
      font-weight: 500;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }

    .tag-item:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      color: var(--primary-dark);
      transform: translateY(-2px);
    }

    /* 价格参考 */
    .price-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .price-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      border: 1px solid var(--border);
      text-align: center;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .price-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-light);
    }

    .price-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 12px 32px rgba(91, 60, 246, 0.15);
    }

    .price-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--gray);
    }

    .price-value {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--dark);
      line-height: 1.2;
    }

    .price-value span {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--gray);
    }

    .price-features {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
      text-align: left;
      font-size: 0.85rem;
      color: var(--gray);
      margin: 8px 0;
    }

    .price-features li::before {
      content: '✓ ';
      color: var(--secondary);
      font-weight: 700;
    }

    /* 服务网络 & 时间线 */
    .timeline {
      display: flex;
      flex-direction: column;
      gap: 0;
      max-width: 720px;
      margin: 0 auto;
      position: relative;
    }

    .timeline::before {
      content: '';
      position: absolute;
      left: 20px;
      top: 0;
      bottom: 0;
      width: 2px;
      background: var(--border);
    }

    .timeline-item {
      position: relative;
      padding-left: 56px;
      padding-bottom: 28px;
    }

    .timeline-item:last-child {
      padding-bottom: 0;
    }

    .timeline-dot {
      position: absolute;
      left: 12px;
      top: 4px;
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: var(--white);
      border: 3px solid var(--primary);
      box-shadow: 0 0 0 4px var(--primary-light);
    }

    .timeline-item h4 {
      font-size: 1rem;
      margin-bottom: 4px;
    }

    .timeline-item p {
      font-size: 0.88rem;
      color: var(--gray);
      margin: 0;
    }

    /* 服务网络网格 */
    .network-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .network-item {
      background: var(--white);
      border-radius: var(--radius-sm);
      padding: 18px;
      border: 1px solid var(--border);
      text-align: center;
      font-size: 0.88rem;
      color: var(--gray);
      font-weight: 500;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }

    .network-item:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      color: var(--primary-dark);
      transform: translateY(-3px);
    }

    /* 移动端适配 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }

      .hero-visual {
        min-height: 280px;
      }

      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 28px;
      }

      .price-grid {
        grid-template-columns: repeat(3, 1fr);
      }

      .network-grid {
        grid-template-columns: repeat(3, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        align-items: stretch;
        padding: 16px 24px;
        gap: 0;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
        max-height: 70vh;
        overflow-y: auto;
      }

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

      .nav-links a {
        padding: 12px 8px;
        font-size: 0.95rem;
        border-bottom: 1px solid var(--gray-light);
      }

      .mobile-toggle {
        display: block;
      }

      .nav-inner {
        position: relative;
      }

      .nav-cta {
        display: none;
      }

      .hero {
        padding: 56px 0 48px;
      }

      .section {
        padding: 52px 0;
      }

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

      .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 14px;
      }

      .stat-number {
        font-size: 2rem;
      }

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

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

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

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

      .form-row {
        grid-template-columns: 1fr;
      }

      .form-wrap {
        padding: 28px 20px;
      }

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
      }

      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }

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

      .network-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .hero-stat-item {
        flex: 1;
      }

      .hero-visual {
        grid-template-columns: 1fr 1fr;
      }

      .panel-grid-alt {
        grid-column: span 2;
      }

      .float-chat {
        right: 16px;
        bottom: 16px;
      }

      .back-to-top {
        right: 16px;
        bottom: 84px;
      }
    }

    @media (max-width: 480px) {
      .container {
        padding: 0 16px;
      }

      .hero h1 {
        font-size: 2rem;
      }

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

      .hero-visual {
        grid-template-columns: 1fr;
      }

      .panel-grid-alt {
        grid-column: span 1;
        grid-template-columns: 1fr;
      }

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

      .floating-panel {
        animation: none;
      }

      .hero-actions .btn {
        width: 100%;
      }
    }