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

    :root {
      --primary: #3A5BFF; /* 高饱和亮蓝 */
      --primary-dark: #1E3AC9;
      --primary-light: #E1E8FF;
      --accent: #FF6B2C; /* 活力橙 */
      --accent-light: #FFEDE5;
      --bg-body: #F8F9FE;
      --bg-card: #FFFFFF;
      --text-main: #0F172A;
      --text-sub: #334155;
      --text-muted: #64748B;
      --border: #E2E8F0;
      --radius-md: 16px;
      --radius-lg: 24px;
      --radius-sm: 12px;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.03);
      --shadow-md: 0 12px 32px rgba(58, 91, 255, 0.08);
      --shadow-hover: 0 20px 40px rgba(58, 91, 255, 0.12);
      --container: 1200px;
      --gap-xs: 8px;
      --gap-sm: 16px;
      --gap-md: 24px;
      --gap-lg: 40px;
      --gap-xl: 64px;
      --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-family);
      background-color: var(--bg-body);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    /* 统一容器 */
    .container {
      max-width: var(--container);
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 文字与标题 */
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.25;
      letter-spacing: -0.02em;
      color: var(--text-main);
    }

    h1 {
      font-size: clamp(2.2rem, 5vw, 3.8rem);
    }

    h2 {
      font-size: clamp(1.8rem, 3.5vw, 2.6rem);
      margin-bottom: var(--gap-sm);
    }

    h3 {
      font-size: 1.4rem;
      font-weight: 600;
    }

    p {
      color: var(--text-sub);
      font-size: 1.05rem;
    }

    .section-title-wrap {
      text-align: center;
      max-width: 780px;
      margin: 0 auto var(--gap-lg);
    }

    .section-title-wrap p {
      max-width: 640px;
      margin: 0 auto;
      color: var(--text-muted);
      font-size: 1.1rem;
    }

    .eyebrow {
      display: inline-block;
      background: var(--primary-light);
      color: var(--primary-dark);
      font-weight: 600;
      font-size: 0.85rem;
      padding: 6px 18px;
      border-radius: 100px;
      letter-spacing: 0.04em;
      margin-bottom: var(--gap-sm);
      text-transform: uppercase;
    }

    /* 按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: 60px;
      font-weight: 600;
      font-size: 1rem;
      text-decoration: none;
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
      line-height: 1.3;
      gap: 8px;
    }

    .btn-primary {
      background: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 8px 18px rgba(58, 91, 255, 0.25);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 14px 24px rgba(58, 91, 255, 0.35);
    }

    .btn-outline {
      background: transparent;
      color: var(--text-main);
      border: 1.5px solid var(--border);
    }

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

    .btn-accent {
      background: var(--accent);
      color: #FFFFFF;
      box-shadow: 0 8px 18px rgba(255, 107, 44, 0.25);
    }

    .btn-accent:hover {
      background: #E55A1F;
      transform: translateY(-2px);
    }

    /* 通用卡片 */
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(226, 232, 240, 0.5);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

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

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    }

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

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      flex-shrink: 0;
    }

    .brand img {
      height: 38px;
      width: auto;
      max-width: 100%;
    }

    .brand-text {
      font-weight: 800;
      font-size: 1.3rem;
      color: var(--text-main);
      letter-spacing: -0.03em;
    }

    /* 导航链接 gap 设置为 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
      margin: 0;
      padding: 0;
      overflow-x: auto;
      scrollbar-width: none;
      flex: 1;
      justify-content: flex-end;
    }

    .nav-links::-webkit-scrollbar {
      display: none;
    }

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

    .nav-links a {
      display: inline-block;
      padding: 8px 10px;
      color: var(--text-sub);
      text-decoration: none;
      font-size: 0.92rem;
      font-weight: 500;
      white-space: nowrap;
      transition: color 0.2s;
      border-radius: 8px;
    }

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

    .nav-cta {
      margin-left: 16px;
      flex-shrink: 0;
    }

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

    .menu-toggle {
      display: none;
      background: transparent;
      border: 1.5px solid var(--border);
      border-radius: 12px;
      width: 44px;
      height: 44px;
      font-size: 1.4rem;
      color: var(--text-main);
      cursor: pointer;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    /* 首屏 Hero — 无图片 */
    .hero {
      padding: 64px 0 56px;
      background: radial-gradient(circle at 20% 30%, #EDF1FE 0%, #F8F9FE 70%);
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: var(--gap-lg);
      align-items: center;
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #FFFFFF;
      border-radius: 100px;
      padding: 6px 16px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary-dark);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      border: 1px solid var(--border);
    }

    .hero h1 {
      margin-bottom: 20px;
      font-size: clamp(2.2rem, 4.5vw, 3.5rem);
      color: var(--text-main);
    }

    .hero h1 span {
      color: var(--primary);
      position: relative;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-sub);
      max-width: 540px;
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }

    .hero-stats {
      display: flex;
      gap: 40px;
      flex-wrap: wrap;
    }

    .hero-stat-item strong {
      display: block;
      font-size: 1.9rem;
      font-weight: 800;
      color: var(--primary-dark);
      line-height: 1.2;
    }

    .hero-stat-item span {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* Hero 右侧装饰多边形 */
    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 340px;
    }

    .floating-shape {
      position: absolute;
      border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%;
      background: linear-gradient(135deg, rgba(58, 91, 255, 0.12), rgba(255, 107, 44, 0.08));
      animation: morph 8s ease-in-out infinite;
      z-index: 0;
    }

    .shape-1 {
      width: 220px;
      height: 220px;
      top: 5%;
      left: 10%;
      animation-delay: 0s;
    }

    .shape-2 {
      width: 280px;
      height: 280px;
      bottom: 0;
      right: 0;
      background: linear-gradient(135deg, rgba(255, 107, 44, 0.12), rgba(58, 91, 255, 0.08));
      animation-delay: -2s;
    }

    .shape-3 {
      width: 140px;
      height: 140px;
      top: 50%;
      left: 60%;
      background: linear-gradient(135deg, rgba(58, 91, 255, 0.15), rgba(255, 107, 44, 0.1));
      animation-delay: -4s;
    }

    @keyframes morph {
      0%, 100% { border-radius: 40% 60% 70% 30% / 40% 50% 60% 50%; transform: rotate(0deg) scale(1); }
      50% { border-radius: 70% 30% 50% 50% / 30% 30% 70% 70%; transform: rotate(10deg) scale(1.05); }
    }

    .hero-float-card {
      position: relative;
      z-index: 2;
      background: rgba(255, 255, 255, 0.8);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.9);
      padding: 24px 28px;
      border-radius: 28px;
      box-shadow: 0 30px 50px -20px rgba(58, 91, 255, 0.2);
      max-width: 340px;
      width: 100%;
      transition: transform 0.3s ease;
    }

    .hero-float-card:hover {
      transform: translateY(-6px);
    }

    .hero-float-card .tag {
      font-size: 0.8rem;
      color: var(--primary);
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      margin-bottom: 12px;
    }

    .hero-float-card p {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .hero-float-card .models {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 12px;
    }

    .model-tag {
      background: var(--primary-light);
      color: var(--primary-dark);
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 100px;
      font-weight: 500;
    }

    /* 章节通用间距 */
    section {
      padding: var(--gap-xl) 0;
    }

    .bg-white {
      background: #FFFFFF;
    }

    .bg-soft {
      background: #F1F4FF;
    }

    /* 数据指标卡片 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: var(--gap-md);
    }

    .stat-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 28px 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
      transition: transform 0.25s, box-shadow 0.25s;
    }

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

    .stat-number {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    /* 服务能力卡片 */
    .capability-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--gap-md);
    }

    .cap-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
    }

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

    .cap-icon {
      width: 48px;
      height: 48px;
      border-radius: 14px;
      background: var(--primary-light);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: var(--primary-dark);
      font-size: 1.5rem;
      font-weight: 700;
    }

    .cap-card h3 {
      font-size: 1.2rem;
      margin-bottom: 8px;
    }

    .cap-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

    .step-item {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 28px 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
      transition: transform 0.25s, box-shadow 0.25s;
    }

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

    .step-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 44px;
      height: 44px;
      background: var(--primary);
      color: #FFFFFF;
      font-weight: 700;
      border-radius: 50%;
      margin-bottom: 16px;
      font-size: 1.1rem;
    }

    .step-item h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }

    .step-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 对比表格 */
    .table-wrap {
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      margin-bottom: var(--gap-md);
    }

    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 700px;
    }

    th {
      background: #F8FAFF;
      padding: 18px 24px;
      text-align: left;
      font-weight: 600;
      color: var(--text-main);
      border-bottom: 1px solid var(--border);
      font-size: 0.95rem;
    }

    td {
      padding: 16px 24px;
      border-bottom: 1px solid var(--border);
      color: var(--text-sub);
      font-size: 0.95rem;
    }

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

    .highlight-row td {
      background: var(--primary-light);
      color: var(--primary-dark);
      font-weight: 600;
    }

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

    .score-badge {
      display: inline-block;
      background: var(--primary);
      color: #FFFFFF;
      padding: 4px 14px;
      border-radius: 100px;
      font-weight: 700;
      font-size: 0.9rem;
    }

    /* 用户评论卡片 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--gap-md);
    }

    .testimonial-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .testimonial-text {
      font-size: 0.98rem;
      color: var(--text-sub);
      line-height: 1.7;
      flex: 1;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .author-info strong {
      display: block;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .author-info span {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 案例展示 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--gap-md);
    }

    .case-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
    }

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

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #F1F4FF;
    }

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

    .case-card:hover .case-img-wrap img {
      transform: scale(1.04);
    }

    .case-info {
      padding: 20px 24px;
    }

    .case-info h3 {
      font-size: 1.1rem;
      margin-bottom: 6px;
    }

    .case-info p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 文章列表 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: var(--gap-sm);
      max-width: 800px;
      margin: 0 auto;
    }

    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: #FFFFFF;
      padding: 20px 28px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
      transition: all 0.2s;
      text-decoration: none;
      gap: 16px;
    }

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

    .article-title {
      font-weight: 600;
      color: var(--text-main);
      font-size: 1rem;
      flex: 1;
    }

    .article-arrow {
      color: var(--primary);
      font-weight: 700;
      flex-shrink: 0;
    }

    /* 表单 */
    .form-wrap {
      max-width: 680px;
      margin: 0 auto;
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 48px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-weight: 600;
      margin-bottom: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      border: 1.5px solid var(--border);
      font-size: 1rem;
      font-family: var(--font-family);
      background: #FFFFFF;
      color: var(--text-main);
      transition: border-color 0.2s, box-shadow 0.2s;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 4px rgba(58, 91, 255, 0.1);
    }

    select.form-control {
      appearance: none;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: right 16px center;
      background-size: 16px;
    }

    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }

    /* 浮动客服 */
    .float-customer {
      position: fixed;
      right: 24px;
      bottom: 100px;
      z-index: 90;
      display: flex;
      flex-direction: column;
      gap: 10px;
      align-items: flex-end;
    }

    .float-btn {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 8px 24px rgba(58, 91, 255, 0.35);
      cursor: pointer;
      transition: all 0.25s;
      border: none;
      font-size: 1.4rem;
      text-decoration: none;
    }

    .float-btn:hover {
      background: var(--primary-dark);
      transform: scale(1.08);
    }

    .float-qr-pop {
      background: #FFFFFF;
      border-radius: var(--radius-sm);
      padding: 14px;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border);
      display: none;
      width: 160px;
      text-align: center;
    }

    .float-qr-pop img {
      width: 100%;
      height: auto;
      border-radius: 8px;
      display: block;
    }

    .float-qr-pop.show {
      display: block;
    }

    /* 回到顶部 */
    .back-top {
      position: fixed;
      right: 24px;
      bottom: 24px;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #FFFFFF;
      border: 1.5px solid var(--border);
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      cursor: pointer;
      z-index: 89;
      transition: all 0.25s;
      box-shadow: var(--shadow-sm);
      opacity: 0;
      visibility: hidden;
    }

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

    .back-top:hover {
      background: var(--primary);
      color: #FFFFFF;
      border-color: var(--primary);
    }

    /* 页脚 */
    .site-footer {
      background: #0A0E1A;
      color: #94A3B8;
      padding: 56px 0 32px;
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: var(--gap-lg);
      margin-bottom: var(--gap-lg);
    }

    .footer-brand p {
      color: #94A3B8;
      margin-top: 12px;
      font-size: 0.9rem;
      line-height: 1.7;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .footer-col ul {
      list-style: none;
      padding: 0;
    }

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col ul a {
      color: #94A3B8;
      text-decoration: none;
      transition: color 0.2s;
    }

    .footer-col ul a:hover {
      color: #FFFFFF;
    }

    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
      color: #64748B;
      font-size: 0.85rem;
    }

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

    .footer-links a {
      color: #94A3B8;
      text-decoration: none;
    }

    .footer-links a:hover {
      color: #FFFFFF;
    }

    /* 标签云 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .cloud-tag {
      background: #FFFFFF;
      border: 1px solid var(--border);
      color: var(--text-sub);
      padding: 8px 18px;
      border-radius: 100px;
      font-size: 0.9rem;
      font-weight: 500;
      transition: all 0.2s;
      text-decoration: none;
    }

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

    /* 滚动动画 */
    .fade-in {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

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

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: var(--gap-md);
      }

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

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

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

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

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

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

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

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        align-items: stretch;
        padding: 16px 24px;
        gap: 0;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border);
        max-height: 70vh;
        overflow-y: auto;
      }

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

      .nav-links li {
        border-bottom: 1px solid var(--border);
      }

      .nav-links a {
        display: block;
        padding: 14px 8px;
        font-size: 1rem;
      }

      .menu-toggle {
        display: flex;
        order: 2;
        margin-left: 12px;
      }

      .nav-cta {
        display: none;
      }

      .brand {
        order: 1;
      }

      .nav-wrap {
        justify-content: flex-start;
        gap: 12px;
      }

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

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

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

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

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

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

      .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--gap-md);
      }

      .hero-actions {
        flex-direction: column;
        align-items: stretch;
      }

      .hero-actions .btn {
        justify-content: center;
      }

      .float-customer {
        right: 16px;
        bottom: 88px;
      }

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

    @media (max-width: 480px) {
      .stats-grid {
        grid-template-columns: 1fr;
      }

      .hero-stats {
        gap: 24px;
      }

      section {
        padding: 48px 0;
      }
    }

    /* 辅助：滚动条 */
    ::-webkit-scrollbar {
      width: 8px;
      height: 8px;
    }
    ::-webkit-scrollbar-track {
      background: #F1F4FF;
    }
    ::-webkit-scrollbar-thumb {
      background: #C7D2FE;
      border-radius: 4px;
    }
    ::-webkit-scrollbar-thumb:hover {
      background: #93A8FF;
    }