:root {
      --primary: #2563eb;
      --primary-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 50%, #06b6d4 100%);
      --accent-warm: linear-gradient(135deg, #f97316 0%, #ec4899 100%);
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-subtle: #f1f5f9;
      --text-dark: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 4px 12px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px rgba(37, 99, 235, 0.08);
      --shadow-hover: 0 16px 36px rgba(37, 99, 235, 0.14);
      --transition: all 0.28s ease;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-dark);
      line-height: 1.65;
      overflow-x: hidden;
      background-image: radial-gradient(at 0% 0%, rgba(37, 99, 235, 0.05) 0, transparent 50%),
                        radial-gradient(at 100% 100%, rgba(236, 72, 153, 0.04) 0, transparent 50%);
      background-attachment: fixed;
    }

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

    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }

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

    .brand-logo-wrap {
      max-width: 140px;
      display: flex;
      align-items: center;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: #0f172a;
      letter-spacing: -0.5px;
    }

    .brand-badge {
      display: inline-block;
      font-size: 0.72rem;
      padding: 2px 8px;
      border-radius: 999px;
      background: #e0f2fe;
      color: #0284c7;
      font-weight: 600;
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: rgba(37, 99, 235, 0.06);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 18px;
      background: var(--primary-gradient);
      color: #ffffff !important;
      font-size: 0.88rem;
      font-weight: 600;
      border-radius: 999px;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.25);
      transition: var(--transition);
    }

    .btn-portal:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(37, 99, 235, 0.35);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-dark);
    }

    /* 首屏 Hero (无任何图片) */
    .hero-section {
      padding: 80px 0 60px;
      position: relative;
    }

    .hero-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 56px 40px;
      box-shadow: var(--shadow-md);
      position: relative;
      overflow: hidden;
      text-align: center;
    }

    .hero-card::before {
      content: "";
      position: absolute;
      top: -100px;
      left: 50%;
      transform: translateX(-50%);
      width: 500px;
      height: 250px;
      background: radial-gradient(circle, rgba(37, 99, 235, 0.12) 0%, rgba(124, 58, 237, 0.08) 50%, transparent 80%);
      pointer-events: none;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #eef2ff;
      border: 1px solid #c7d2fe;
      color: #4338ca;
      font-size: 0.85rem;
      font-weight: 600;
      padding: 6px 16px;
      border-radius: 999px;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 900;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      max-width: 820px;
      margin: 0 auto 36px;
      font-size: 1.12rem;
      color: var(--text-muted);
      line-height: 1.8;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }

    .btn-hero-main {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 14px 34px;
      background: var(--primary-gradient);
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 999px;
      box-shadow: 0 10px 24px rgba(37, 99, 235, 0.3);
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }

    .btn-hero-main:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 14px 28px rgba(37, 99, 235, 0.4);
    }

    .btn-hero-sub {
      display: inline-flex;
      align-items: center;
      padding: 14px 28px;
      background: #ffffff;
      color: var(--text-dark);
      border: 1px solid var(--border-color);
      font-size: 1.02rem;
      font-weight: 600;
      border-radius: 999px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .btn-hero-sub:hover {
      background: var(--bg-subtle);
      border-color: #cbd5e1;
      transform: translateY(-2px);
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
      padding-top: 36px;
      border-top: 1px solid var(--border-color);
    }

    .metric-item {
      text-align: center;
    }

    .metric-num {
      font-size: 1.9rem;
      font-weight: 800;
      color: #0f172a;
      background: linear-gradient(135deg, #1e40af, #6b21a8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: #1e40af;
      display: block;
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 模块通用样式 */
    .section-wrap {
      padding: 64px 0;
    }

    .section-head {
      text-align: center;
      margin-bottom: 44px;
    }

    .section-pill {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 999px;
      background: rgba(37, 99, 235, 0.08);
      color: var(--primary);
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

    /* 网格通用 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

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

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      border-color: #93c5fd;
      box-shadow: var(--shadow-hover);
    }

    .card-icon-box {
      width: 50px;
      height: 50px;
      border-radius: var(--radius-sm);
      background: #eff6ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 800;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 1.18rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-dark);
    }

    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 平台矩阵标签云 */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
      justify-content: center;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: #334155;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .model-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f0f7ff;
    }

    /* 流程步骤 */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 18px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 800;
      font-size: 1rem;
      margin-bottom: 14px;
    }

    .step-card h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 案例中心图片区 (首屏之外展示) */
    .case-gallery {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 24px;
    }

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

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

    .case-img-wrap {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .case-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.35s ease;
    }

    .case-item:hover .case-img-wrap img {
      transform: scale(1.02);
    }

    .case-body {
      padding: 20px;
    }

    .case-body h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .case-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    .banner-stream {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .banner-stream-item {
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #fff;
    }

    .banner-stream-item img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 对比评测高光卡片与表格 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #ffffff 0%, #f0fdf4 100%);
      border: 2px solid #86efac;
      border-radius: var(--radius-lg);
      padding: 36px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 30px;
      box-shadow: var(--shadow-sm);
    }

    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .eval-big-score {
      font-size: 3.4rem;
      font-weight: 900;
      color: #16a34a;
      line-height: 1;
    }

    .eval-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

    .eval-table th,
    .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    .eval-table th {
      background: #f8fafc;
      font-weight: 700;
      color: #1e293b;
    }

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

    .eval-table td.col-brand {
      background: rgba(37, 99, 235, 0.03);
      font-weight: 700;
      color: var(--primary);
    }

    /* 用户评论 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-content {
      font-size: 0.92rem;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 18px;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .author-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: #0f172a;
    }

    .author-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 折叠 FAQ */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item.active {
      border-color: #93c5fd;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: none;
      border: none;
      font-size: 1.02rem;
      font-weight: 700;
      color: #0f172a;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--primary);
    }

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

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    /* 表单与服务咨询 */
    .form-panel-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .form-grid-inner {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
    }

    .form-side-content {
      padding: 44px;
      border-right: 1px solid var(--border-color);
    }

    .form-side-kefu {
      padding: 44px;
      background: #f8fafc;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: #334155;
      margin-bottom: 8px;
    }

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--text-dark);
      outline: none;
      transition: var(--transition);
      background: #ffffff;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    }

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

    .btn-submit {
      width: 100%;
      padding: 14px 20px;
      background: var(--primary-gradient);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 1.05rem;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 8px 20px rgba(37, 99, 235, 0.25);
      transition: var(--transition);
    }

    .btn-submit:hover {
      opacity: 0.95;
      transform: translateY(-2px);
    }

    .kefu-qr-box {
      max-width: 170px;
      margin: 16px 0;
      padding: 8px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-sm);
    }

    .kefu-qr-box img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 资讯与百科 */
    .article-link-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 20px;
    }

    .article-item-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition);
    }

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

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

    .article-link-anchor:hover {
      color: var(--primary);
    }

    /* 代理加盟卡片 */
    .agent-banner {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 48px;
      position: relative;
      overflow: hidden;
    }

    .agent-banner h3 {
      font-size: 1.8rem;
      font-weight: 800;
      margin-bottom: 12px;
      color: #ffffff;
    }

    .agent-banner p {
      color: #cbd5e1;
      font-size: 1rem;
      max-width: 680px;
      margin-bottom: 24px;
    }

    .agent-benefits {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-bottom: 28px;
    }

    .agent-benefit-item {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-sm);
      padding: 16px;
    }

    .agent-benefit-item h5 {
      font-size: 1.05rem;
      margin-bottom: 6px;
      color: #38bdf8;
    }

    .agent-benefit-item p {
      font-size: 0.85rem;
      color: #e2e8f0;
      margin-bottom: 0;
    }

    /* 友情链接与页脚 */
    .links-section {
      background: #f1f5f9;
      padding: 30px 0;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .links-inner {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    .links-label {
      font-weight: 700;
      font-size: 0.9rem;
      color: var(--text-dark);
    }

    .links-inner a {
      font-size: 0.88rem;
      color: var(--text-muted);
      background: #ffffff;
      padding: 4px 12px;
      border-radius: var(--radius-sm);
      border: 1px solid #e2e8f0;
      transition: var(--transition);
    }

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

    .site-footer {
      background: #ffffff;
      padding: 48px 0 32px;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
      margin-bottom: 36px;
    }

    .footer-brand p {
      margin-top: 12px;
      line-height: 1.65;
      max-width: 320px;
    }

    .footer-col h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 16px;
    }

    .footer-nav {
      list-style: none;
    }

    .footer-nav li {
      margin-bottom: 8px;
    }

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

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      text-align: center;
      font-size: 0.84rem;
      color: #64748b;
    }

    /* 浮动客服挂件与返回顶部 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 50%;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.15rem;
      color: var(--text-dark);
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* 移动端响应式 */
    @media (max-width: 992px) {
      .grid-4, .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .form-grid-inner {
        grid-template-columns: 1fr;
      }
      .form-side-content {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .agent-benefits {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        align-items: stretch;
        padding: 16px 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .case-gallery {
        grid-template-columns: 1fr;
      }
      .banner-stream {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 640px) {
      .grid-4, .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .process-timeline {
        grid-template-columns: 1fr;
      }
      .hero-card {
        padding: 36px 20px;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .eval-highlight-box {
        flex-direction: column;
        text-align: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }