/* ---------- 全局重置与变量 ---------- */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #2563eb;
      --primary-light: #3b82f6;
      --primary-dark: #1d4ed8;
      --accent: #f59e0b;
      --accent-light: #fbbf24;
      --bg-gradient: linear-gradient(135deg, #f0f7ff 0%, #e8f0fe 50%, #f5f9ff 100%);
      --surface: #ffffff;
      --surface-alt: #f8fafc;
      --text-primary: #0f172a;
      --text-secondary: #334155;
      --text-muted: #64748b;
      --border: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
      --shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
      --radius: 16px;
      --radius-sm: 10px;
      --radius-lg: 24px;
      --container: 1200px;
      --font: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font);
      color: var(--text-primary);
      background: var(--bg-gradient);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img { max-width: 100%; height: auto; display: block; }
    a { text-decoration: none; color: inherit; }
    ul { list-style: none; }

    /* ---------- 容器 ---------- */
    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ---------- 按钮 ---------- */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      border-radius: 50px;
      font-size: 15px;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(37, 99, 235, 0.45);
    }
    .btn-outline {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #fff;
      transform: translateY(-2px);
    }
    .btn-accent {
      background: var(--accent);
      color: #1e293b;
      box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
    }
    .btn-accent:hover {
      background: var(--accent-light);
      transform: translateY(-2px);
    }
    .btn-sm {
      padding: 8px 20px;
      font-size: 14px;
    }

    /* ---------- 顶部导航 ---------- */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
      transition: box-shadow 0.3s;
    }
    .site-header.scrolled {
      box-shadow: var(--shadow-md);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 68px;
      gap: 16px;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }
    .brand img {
      width: 36px;
      height: 36px;
      object-fit: contain;
    }
    .brand-name {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: -0.5px;
    }
    .brand-name span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      overflow-x: auto;
      scrollbar-width: none;
    }
    .nav-links::-webkit-scrollbar { display: none; }
    .nav-links a {
      display: block;
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-secondary);
      border-radius: 8px;
      transition: all 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--primary);
      background: rgba(37, 99, 235, 0.06);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }
    .mobile-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .mobile-toggle span {
      display: block;
      width: 22px;
      height: 2px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: all 0.3s;
    }

    /* ---------- Hero 首屏（无图片） ---------- */
    .hero {
      position: relative;
      padding: 80px 0 60px;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -120px;
      right: -100px;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero::after {
      content: '';
      position: absolute;
      bottom: -80px;
      left: -80px;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(245,158,11,0.06) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero-inner {
      display: grid;
      grid-template-columns: 1fr 0.85fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 1;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      background: rgba(37, 99, 235, 0.08);
      color: var(--primary);
      border-radius: 50px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 20px;
      border: 1px solid rgba(37, 99, 235, 0.15);
    }
    .hero-badge .dot {
      width: 6px;
      height: 6px;
      background: var(--primary);
      border-radius: 50%;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(1.3); }
    }
    .hero h1 {
      font-size: 42px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -1px;
      margin-bottom: 20px;
      color: var(--text-primary);
    }
    .hero h1 .highlight {
      color: var(--primary);
      position: relative;
    }
    .hero-sub {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 540px;
      line-height: 1.8;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 36px;
    }
    .hero-stats {
      display: flex;
      flex-wrap: wrap;
      gap: 32px;
    }
    .hero-stat-item {
      display: flex;
      flex-direction: column;
    }
    .hero-stat-num {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.3;
    }
    .hero-stat-label {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 2px;
    }
    /* Hero 右侧无图片 —— 纯 CSS 卡片堆叠 */
    .hero-visual {
      position: relative;
      display: flex;
      flex-direction: column;
      gap: 14px;
      padding: 10px 0;
    }
    .hero-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 20px 24px;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border);
      transition: all 0.3s ease;
      animation: floatUp 0.8s ease both;
    }
    .hero-card:nth-child(1) { animation-delay: 0.1s; }
    .hero-card:nth-child(2) { animation-delay: 0.2s; margin-left: 28px; }
    .hero-card:nth-child(3) { animation-delay: 0.3s; margin-left: 12px; }
    @keyframes floatUp {
      from { opacity: 0; transform: translateY(24px); }
      to { opacity: 1; transform: translateY(0); }
    }
    .hero-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .hero-card-label {
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 4px;
    }
    .hero-card-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-primary);
    }
    .hero-card-desc {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 4px;
    }

    /* ---------- 通用 section ---------- */
    .section {
      padding: 72px 0;
    }
    .section-alt {
      background: rgba(255, 255, 255, 0.55);
      backdrop-filter: blur(6px);
    }
    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 16px;
      background: rgba(37, 99, 235, 0.08);
      color: var(--primary);
      border-radius: 50px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-primary);
      letter-spacing: -0.5px;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.8;
    }

    /* ---------- 数据指标卡片 ---------- */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .stat-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 28px 24px;
      text-align: center;
      border: 1px solid var(--border);
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .stat-value {
      font-size: 34px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 6px;
    }

    /* ---------- 服务能力卡片 ---------- */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .service-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 28px;
      border: 1px solid var(--border);
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(37, 99, 235, 0.2);
    }
    .service-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      background: rgba(37, 99, 235, 0.08);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      font-size: 22px;
    }
    .service-card h3 {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 8px;
    }
    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      flex: 1;
    }
    .service-card .tag-row {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 14px;
    }
    .tag {
      display: inline-block;
      padding: 2px 10px;
      background: rgba(37, 99, 235, 0.06);
      color: var(--primary);
      border-radius: 50px;
      font-size: 12px;
      font-weight: 500;
    }

    /* ---------- 流程步骤 ---------- */
    .steps-wrap {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      counter-reset: step;
    }
    .step-item {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 28px 24px;
      border: 1px solid var(--border);
      position: relative;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
    }
    .step-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .step-item::before {
      counter-increment: step;
      content: "0" counter(step);
      display: block;
      font-size: 28px;
      font-weight: 800;
      color: rgba(37, 99, 235, 0.12);
      margin-bottom: 12px;
      line-height: 1;
    }
    .step-item h3 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 6px;
    }
    .step-item p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* ---------- 对比表格 ---------- */
    .table-scroll {
      overflow-x: auto;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      background: var(--surface);
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 720px;
      font-size: 14px;
    }
    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      text-align: left;
      border-bottom: 1px solid var(--border);
    }
    .compare-table thead th {
      background: rgba(37, 99, 235, 0.04);
      font-weight: 700;
      color: var(--text-primary);
      font-size: 14px;
      white-space: nowrap;
    }
    .compare-table tbody tr:last-child td { border-bottom: none; }
    .compare-table tbody tr:hover { background: rgba(37, 99, 235, 0.02); }
    .compare-table .col-highlight {
      background: rgba(37, 99, 235, 0.04);
      font-weight: 600;
      color: var(--primary);
    }
    .rating-stars {
      color: var(--accent);
      font-size: 18px;
      letter-spacing: 2px;
    }
    .rating-score {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
    }
    .rating-total {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* ---------- 案例展示 ---------- */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .case-card {
      background: var(--surface);
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border);
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }
    .case-img-wrap {
      aspect-ratio: 16/9;
      overflow: hidden;
      background: var(--surface-alt);
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }
    .case-body {
      padding: 20px;
    }
    .case-body h3 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 6px;
    }
    .case-body p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* ---------- 用户评论 ---------- */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .review-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 26px;
      border: 1px solid var(--border);
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .review-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .review-text {
      font-size: 14px;
      color: var(--text-secondary);
      line-height: 1.8;
      flex: 1;
      margin-bottom: 18px;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .review-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--primary-light));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
      font-size: 16px;
      flex-shrink: 0;
    }
    .review-name {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-primary);
    }
    .review-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* ---------- FAQ ---------- */
    .faq-list {
      max-width: 820px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: var(--surface);
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
      overflow: hidden;
      transition: box-shadow 0.25s;
    }
    .faq-item:hover { box-shadow: var(--shadow-sm); }
    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 24px;
      cursor: pointer;
      font-size: 15px;
      font-weight: 600;
      color: var(--text-primary);
      gap: 16px;
      user-select: none;
      transition: background 0.2s;
    }
    .faq-question:hover { background: rgba(37, 99, 235, 0.02); }
    .faq-question .icon {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: rgba(37, 99, 235, 0.08);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      transition: transform 0.3s;
      font-size: 14px;
      color: var(--primary);
      font-weight: 700;
    }
    .faq-item.active .faq-question .icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px;
    }

    /* ---------- 表单 ---------- */
    .form-wrap {
      max-width: 720px;
      margin: 0 auto;
      background: var(--surface);
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-md);
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group.full { grid-column: 1 / -1; }
    .form-group label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-secondary);
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-family: inherit;
      color: var(--text-primary);
      background: var(--surface-alt);
      transition: border-color 0.25s, box-shadow 0.25s;
      outline: none;
      width: 100%;
    }
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
      background: #fff;
    }
    .form-group textarea {
      resize: vertical;
      min-height: 100px;
    }
    .form-actions {
      margin-top: 24px;
      text-align: center;
    }

    /* ---------- 友情链接 & 文章 ---------- */
    .link-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }
    .link-tags a {
      display: inline-block;
      padding: 8px 18px;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 50px;
      font-size: 13px;
      color: var(--text-secondary);
      transition: all 0.25s;
    }
    .link-tags a:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(37, 99, 235, 0.04);
      transform: translateY(-2px);
    }
    .articles-list {
      display: flex;
      flex-direction: column;
      gap: 0;
      background: var(--surface);
      border-radius: var(--radius);
      border: 1px solid var(--border);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .article-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 16px 24px;
      border-bottom: 1px solid var(--border);
      transition: background 0.2s;
    }
    .article-row:last-child { border-bottom: none; }
    .article-row:hover { background: rgba(37, 99, 235, 0.02); }
    .article-row span {
      font-size: 14px;
      color: var(--text-secondary);
    }
    .article-row a {
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      flex-shrink: 0;
      transition: color 0.2s;
    }
    .article-row a:hover { color: var(--primary-dark); }

    /* ---------- 页脚 ---------- */
    .site-footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 56px 0 0;
      margin-top: 40px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 40px;
      padding-bottom: 40px;
      border-bottom: 1px solid rgba(203, 213, 225, 0.12);
    }
    .footer-col h4 {
      font-size: 15px;
      font-weight: 700;
      color: #f1f5f9;
      margin-bottom: 16px;
    }
    .footer-col p,
    .footer-col a {
      font-size: 13px;
      color: #94a3b8;
      line-height: 1.9;
      display: block;
      transition: color 0.2s;
    }
    .footer-col a:hover { color: #fff; }
    .footer-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 14px;
    }
    .footer-brand img {
      width: 32px;
      height: 32px;
      object-fit: contain;
      border-radius: 8px;
    }
    .footer-brand span {
      font-size: 18px;
      font-weight: 700;
      color: #f1f5f9;
    }
    .footer-qr {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 12px;
    }
    .footer-qr img {
      width: 72px;
      height: 72px;
      object-fit: cover;
      border-radius: 10px;
      border: 2px solid rgba(203,213,225,0.15);
    }
    .footer-qr-text {
      font-size: 12px;
      color: #94a3b8;
    }
    .footer-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
      padding: 22px 0;
    }
    .footer-bottom p {
      font-size: 13px;
      color: #64748b;
    }
    .footer-bottom a {
      color: #94a3b8;
      font-size: 13px;
      transition: color 0.2s;
    }
    .footer-bottom a:hover { color: #fff; }

    /* ---------- 浮动客服 ---------- */
    .float-kf {
      position: fixed;
      right: 20px;
      bottom: 80px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
      align-items: flex-end;
    }
    .float-kf-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
      cursor: pointer;
      transition: all 0.25s ease;
      border: none;
      font-size: 22px;
    }
    .float-kf-btn:hover {
      transform: scale(1.08);
      background: var(--primary-dark);
    }
    .float-kf-pop {
      display: none;
      background: var(--surface);
      border-radius: var(--radius);
      padding: 16px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border);
      text-align: center;
      width: 180px;
      animation: fadeIn 0.25s ease;
    }
    .float-kf-pop.active { display: block; }
    .float-kf-pop img {
      width: 120px;
      height: 120px;
      object-fit: cover;
      border-radius: 10px;
      margin: 0 auto 8px;
    }
    .float-kf-pop p {
      font-size: 12px;
      color: var(--text-muted);
    }
    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(8px); }
      to { opacity: 1; transform: translateY(0); }
    }
    .back-top {
      position: fixed;
      right: 20px;
      bottom: 20px;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--surface);
      border: 1px solid var(--border);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: var(--shadow-md);
      transition: all 0.25s;
      opacity: 0;
      pointer-events: none;
      font-size: 18px;
    }
    .back-top.visible {
      opacity: 1;
      pointer-events: auto;
    }
    .back-top:hover {
      background: var(--primary);
      color: #fff;
      transform: translateY(-2px);
    }

    /* ---------- 滚动渐入 ---------- */
    .reveal {
      opacity: 0;
      transform: translateY(28px);
      transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* ---------- 响应式 ---------- */
    @media (max-width: 1024px) {
      .hero-inner { grid-template-columns: 1fr; gap: 36px; }
      .hero h1 { font-size: 34px; }
      .hero-visual { flex-direction: row; flex-wrap: wrap; }
      .hero-card { flex: 1; min-width: 180px; margin-left: 0 !important; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .steps-wrap { grid-template-columns: repeat(2, 1fr); }
      .cases-grid { grid-template-columns: repeat(2, 1fr); }
      .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        padding: 12px 24px 20px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
        gap: 2px;
      }
      .nav-links.open { display: flex; }
      .nav-links a { padding: 10px 12px; width: 100%; }
      .mobile-toggle { display: flex; }
      .header-actions .btn { display: none; }
      .hero { padding: 48px 0 40px; }
      .hero h1 { font-size: 28px; }
      .hero-sub { font-size: 15px; }
      .hero-stats { gap: 20px; }
      .hero-visual { flex-direction: column; }
      .hero-card { min-width: 0; }
      .section { padding: 48px 0; }
      .section-title { font-size: 26px; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
      .stat-value { font-size: 28px; }
      .services-grid { grid-template-columns: 1fr; }
      .steps-wrap { grid-template-columns: 1fr; }
      .cases-grid { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .form-wrap { padding: 28px 20px; }
      .form-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; gap: 28px; }
      .footer-bottom { flex-direction: column; text-align: center; }
      .article-row { flex-direction: column; align-items: flex-start; gap: 6px; }
      .float-kf { right: 14px; bottom: 70px; }
      .back-top { right: 14px; bottom: 14px; }
    }
    @media (max-width: 480px) {
      .hero-actions { flex-direction: column; }
      .hero-actions .btn { width: 100%; }
      .stats-grid { grid-template-columns: 1fr; }
    }