* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --bg-body: #f9fafc;
      --bg-card: #ffffff;
      --text-primary: #0f1b2d;
      --text-secondary: #33445e;
      --text-muted: #5e6f8d;
      --brand-1: #3a7bd5;
      --brand-2: #8e54e9;
      --brand-gradient: linear-gradient(135deg, #3a7bd5, #8e54e9);
      --brand-gradient-soft: linear-gradient(135deg, rgba(58,123,213,0.08), rgba(142,84,233,0.08));
      --border-light: rgba(0,0,0,0.06);
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.03);
      --shadow-md: 0 12px 28px rgba(0,0,0,0.06);
      --shadow-hover: 0 20px 36px rgba(58,123,213,0.12);
      --radius-card: 24px;
      --radius-btn: 40px;
      --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-body);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      padding: 0 16px;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 8px;
    }
    header, main, footer {
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.25;
      color: var(--text-primary);
      letter-spacing: -0.02em;
    }
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; margin-bottom: 0.75rem; }
    h3 { font-size: 1.35rem; margin-bottom: 0.5rem; }
    p { color: var(--text-secondary); }
    a { text-decoration: none; color: inherit; }
    img { max-width: 100%; height: auto; display: block; }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      background: var(--brand-gradient);
      color: #fff;
      border: none;
      cursor: pointer;
      transition: transform 0.25s ease, box-shadow 0.3s ease, filter 0.2s;
      box-shadow: 0 6px 16px rgba(58,123,213,0.25);
      will-change: transform;
    }
    .btn:hover {
      transform: translateY(-3px);
      box-shadow: 0 16px 28px rgba(58,123,213,0.35);
    }
    .btn:active {
      transform: translateY(0) scale(0.98);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--brand-1);
      color: var(--brand-1);
      box-shadow: none;
    }
    .btn-outline:hover {
      background: rgba(58,123,213,0.06);
      box-shadow: 0 12px 24px rgba(58,123,213,0.12);
    }
    .section {
      padding: 4rem 0;
    }
    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 2.5rem;
    }
    .section-header p {
      font-size: 1.1rem;
      color: var(--text-muted);
    }
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 1.8rem;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      border: 1px solid var(--border-light);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 1.8rem;
      align-items: stretch;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 1.8rem;
    }
    .tag {
      display: inline-block;
      background: var(--brand-gradient-soft);
      color: var(--brand-1);
      font-size: 0.85rem;
      font-weight: 600;
      padding: 0.3rem 0.9rem;
      border-radius: 20px;
      margin-bottom: 0.6rem;
    }
    /* 导航 */
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1.2rem 0;
      border-bottom: 1px solid var(--border-light);
      flex-wrap: wrap;
      gap: 0.5rem;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      flex-shrink: 0;
    }
    .logo-area img {
      max-height: 40px;
      width: auto;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
      flex-wrap: wrap;
    }
    .nav-links li a {
      display: block;
      padding: 0.4rem 0.8rem;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-secondary);
      border-radius: 20px;
      transition: background 0.2s, color 0.2s;
    }
    .nav-links li a:hover {
      background: var(--brand-gradient-soft);
      color: var(--brand-1);
    }
    .nav-right {
      display: flex;
      align-items: center;
      gap: 0.8rem;
      flex-shrink: 0;
    }
    .nav-right .btn {
      padding: 0.5rem 1.5rem;
      font-size: 0.9rem;
    }
    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      font-size: 1.8rem;
      cursor: pointer;
      color: var(--text-primary);
      padding: 0.2rem 0.6rem;
    }
    /* 首屏 */
    .hero {
      position: relative;
      padding: 3rem 0 4rem;
      background: radial-gradient(circle at 20% 30%, rgba(58,123,213,0.06) 0%, transparent 50%),
                  radial-gradient(circle at 80% 70%, rgba(142,84,233,0.06) 0%, transparent 50%);
      border-radius: 0 0 40px 40px;
      overflow: hidden;
    }
    .hero::after {
      content: '';
      position: absolute;
      top: -30%;
      right: -10%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(142,84,233,0.08) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero-inner {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 2.5rem;
    }
    .hero-text {
      flex: 1 1 400px;
      position: relative;
      z-index: 2;
    }
    .hero-text h1 {
      font-size: 3rem;
      margin-bottom: 1rem;
      line-height: 1.2;
      background: linear-gradient(135deg, #1a2b4c, #3a7bd5, #8e54e9);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    .hero-text p {
      font-size: 1.15rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      align-items: center;
    }
    .hero-visual {
      flex: 1 1 300px;
      position: relative;
      z-index: 1;
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
      justify-content: center;
    }
    .stat-block {
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.9);
      border-radius: 20px;
      padding: 1.2rem 1.8rem;
      box-shadow: 0 12px 32px rgba(58,123,213,0.08);
      text-align: center;
      min-width: 120px;
      transition: transform 0.3s ease;
    }
    .stat-block:hover {
      transform: translateY(-6px);
    }
    .stat-block strong {
      display: block;
      font-size: 1.8rem;
      font-weight: 800;
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    .stat-block span {
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    /* 数据指标 */
    .metrics-strip {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      gap: 1.5rem;
      padding: 2rem 1rem;
      background: var(--bg-card);
      border-radius: 32px;
      box-shadow: var(--shadow-sm);
      margin-top: -2rem;
      position: relative;
      z-index: 5;
      border: 1px solid var(--border-light);
    }
    .metric-item {
      text-align: center;
      flex: 1 1 120px;
    }
    .metric-item strong {
      display: block;
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--brand-1);
    }
    .metric-item span {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    /* 服务能力 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 1.5rem;
    }
    .service-card {
      background: var(--bg-card);
      border-radius: 20px;
      padding: 1.6rem;
      border: 1px solid var(--border-light);
      transition: transform 0.3s, box-shadow 0.3s;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 0.6rem;
    }
    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .service-card h3 {
      font-size: 1.15rem;
      margin: 0;
    }
    .service-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      flex: 1;
    }
    /* 流程 */
    .steps {
      display: flex;
      flex-wrap: wrap;
      gap: 1.5rem;
      counter-reset: step;
    }
    .step-item {
      flex: 1 1 180px;
      background: var(--bg-card);
      border-radius: 20px;
      padding: 1.8rem 1.4rem;
      border: 1px solid var(--border-light);
      position: relative;
      counter-increment: step;
    }
    .step-item::before {
      content: counter(step, decimal-leading-zero);
      font-size: 2.2rem;
      font-weight: 800;
      color: rgba(58,123,213,0.12);
      position: absolute;
      top: 10px;
      right: 16px;
      line-height: 1;
    }
    .step-item h3 {
      font-size: 1.1rem;
      margin-bottom: 0.4rem;
    }
    .step-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    /* 对比表格 */
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      background: var(--bg-card);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .compare-table th, .compare-table td {
      padding: 1rem 1.2rem;
      text-align: left;
      border-bottom: 1px solid var(--border-light);
      font-size: 0.95rem;
    }
    .compare-table th {
      background: var(--brand-gradient-soft);
      font-weight: 700;
      color: var(--brand-1);
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .compare-table tr:hover td {
      background: rgba(58,123,213,0.02);
    }
    .score-big {
      font-size: 2rem;
      font-weight: 800;
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    /* FAQ */
    .faq-list {
      max-width: 820px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 0.8rem;
    }
    .faq-item {
      background: var(--bg-card);
      border-radius: 16px;
      border: 1px solid var(--border-light);
      overflow: hidden;
      transition: box-shadow 0.3s;
    }
    .faq-item:hover {
      box-shadow: var(--shadow-sm);
    }
    .faq-q {
      padding: 1.2rem 1.5rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 1rem;
      background: var(--bg-card);
      transition: background 0.2s;
      user-select: none;
    }
    .faq-q::after {
      content: '+';
      font-size: 1.5rem;
      font-weight: 300;
      color: var(--brand-1);
      transition: transform 0.3s;
    }
    .faq-item.active .faq-q::after {
      transform: rotate(45deg);
    }
    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      padding: 0 1.5rem;
      color: var(--text-muted);
      font-size: 0.95rem;
    }
    .faq-item.active .faq-a {
      max-height: 300px;
      padding: 0 1.5rem 1.3rem;
    }
    /* 评论 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 1.5rem;
    }
    .review-card {
      background: var(--bg-card);
      border-radius: 20px;
      padding: 1.5rem;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .review-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .review-stars {
      color: #f5b342;
      letter-spacing: 2px;
      font-size: 1.1rem;
      margin-bottom: 0.6rem;
    }
    .review-text {
      font-size: 0.95rem;
      color: var(--text-secondary);
      margin-bottom: 1rem;
      min-height: 4rem;
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 0.8rem;
    }
    .review-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--brand-gradient);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
      font-size: 1rem;
    }
    .review-name {
      font-weight: 600;
      font-size: 0.95rem;
    }
    .review-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    /* 案例 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 1.5rem;
    }
    .case-card {
      background: var(--bg-card);
      border-radius: 24px;
      overflow: hidden;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      aspect-ratio: 16/10;
      overflow: hidden;
      background: #eef2f8;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      background: #eef2f8;
    }
    .case-content {
      padding: 1.2rem 1.5rem 1.5rem;
    }
    .case-content h3 {
      font-size: 1.1rem;
      margin-bottom: 0.3rem;
    }
    .case-content p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    /* 文章 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 0.8rem;
    }
    .article-item {
      display: flex;
      align-items: center;
      gap: 1rem;
      padding: 1rem 1.5rem;
      background: var(--bg-card);
      border-radius: 16px;
      border: 1px solid var(--border-light);
      transition: transform 0.2s, box-shadow 0.2s;
      color: var(--text-secondary);
      font-weight: 500;
    }
    .article-item:hover {
      transform: translateX(6px);
      box-shadow: var(--shadow-sm);
      color: var(--brand-1);
    }
    .article-item .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--brand-gradient);
      flex-shrink: 0;
    }
    /* 表单 */
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1.2rem;
    }
    .form-field {
      display: flex;
      flex-direction: column;
      gap: 0.4rem;
    }
    .form-field.full {
      grid-column: 1 / -1;
    }
    .form-field label {
      font-weight: 600;
      font-size: 0.9rem;
      color: var(--text-secondary);
    }
    .form-field input, .form-field select, .form-field textarea {
      padding: 0.9rem 1.2rem;
      border-radius: 12px;
      border: 1px solid rgba(0,0,0,0.1);
      background: #f9fafc;
      font-size: 0.95rem;
      transition: border 0.2s, box-shadow 0.2s;
      font-family: inherit;
    }
    .form-field input:focus, .form-field select:focus, .form-field textarea:focus {
      outline: none;
      border-color: var(--brand-1);
      box-shadow: 0 0 0 3px rgba(58,123,213,0.15);
    }
    .form-field textarea {
      resize: vertical;
      min-height: 100px;
    }
    /* 标签云 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 0.8rem;
      justify-content: center;
    }
    .tag-cloud span {
      background: var(--bg-card);
      padding: 0.5rem 1.2rem;
      border-radius: 30px;
      font-size: 0.85rem;
      color: var(--text-secondary);
      border: 1px solid var(--border-light);
      transition: all 0.2s;
    }
    .tag-cloud span:hover {
      background: var(--brand-gradient);
      color: #fff;
      border-color: transparent;
    }
    /* 页脚 */
    footer {
      background: #0f1b2d;
      color: #b0c4de;
      padding: 3rem 0 1.5rem;
      border-radius: 40px 40px 0 0;
      margin-top: 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 2rem;
      margin-bottom: 2rem;
    }
    .footer-grid h4 {
      color: #fff;
      margin-bottom: 1rem;
      font-size: 1.1rem;
    }
    .footer-grid ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }
    .footer-grid ul li a {
      color: #b0c4de;
      font-size: 0.9rem;
      transition: color 0.2s;
    }
    .footer-grid ul li a:hover {
      color: #fff;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 1.5rem;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 1rem;
      font-size: 0.85rem;
      color: #8a9bb5;
    }
    .footer-bottom a {
      color: #b0c4de;
    }
    .footer-bottom a:hover {
      color: #fff;
    }
    .footer-contact {
      display: flex;
      flex-wrap: wrap;
      gap: 1.2rem;
      align-items: center;
    }
    .footer-contact img {
      width: 80px;
      border-radius: 8px;
      border: 2px solid rgba(255,255,255,0.15);
    }
    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 20px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 0.6rem;
      align-items: flex-end;
    }
    .float-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: var(--brand-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 8px 20px rgba(58,123,213,0.35);
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.2s;
      border: none;
      font-size: 1.4rem;
    }
    .float-btn:hover {
      transform: translateY(-3px) scale(1.05);
      box-shadow: 0 12px 24px rgba(58,123,213,0.5);
    }
    .back-top {
      background: #fff;
      color: var(--brand-1);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      font-size: 1.2rem;
    }
    .back-top.visible {
      display: flex;
    }
    /* 动画 */
    .fade-up {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .nav-links {
        gap: 0;
      }
      .nav-links li a {
        padding: 0.3rem 0.6rem;
        font-size: 0.85rem;
      }
    }
    @media (max-width: 860px) {
      .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        padding: 1rem 0;
        background: var(--bg-card);
        border-radius: 16px;
        box-shadow: var(--shadow-md);
        margin-top: 0.5rem;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        z-index: 100;
      }
      .nav-links.open {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        padding: 0.7rem 1.5rem;
        font-size: 1rem;
        border-radius: 0;
      }
      .menu-toggle {
        display: block;
      }
      .nav-bar {
        position: relative;
        flex-wrap: nowrap;
      }
      .hero-text h1 {
        font-size: 2.2rem;
      }
      .hero {
        padding: 2rem 0 3rem;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .compare-table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 480px) {
      h1 { font-size: 1.9rem; }
      h2 { font-size: 1.6rem; }
      .hero-text h1 { font-size: 1.8rem; }
      .metrics-strip { flex-direction: column; gap: 1rem; }
      .footer-grid { grid-template-columns: 1fr; }
      .float-kefu { right: 12px; bottom: 12px; }
      .float-btn { width: 46px; height: 46px; font-size: 1.2rem; }
      .section { padding: 2.5rem 0; }
    }
    .sr-only {
      position: absolute;
      width: 1px;
      height: 1px;
      padding: 0;
      margin: -1px;
      overflow: hidden;
      clip: rect(0,0,0,0);
      white-space: nowrap;
      border: 0;
    }