/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-hover: #1D4ED8;
      --accent: #0284C7;
      --cta: #F97316;
      --cta-hover: #EA580C;
      --dark-slate: #0F172A;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-main: #334155;
      --text-title: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
      --card-shadow-hover: 0 12px 30px -4px rgba(15, 23, 42, 0.12);
      --container-max: 1280px;
      --radius-md: 12px;
      --radius-sm: 8px;
    }

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

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

    body {
      font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.2s ease;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部通栏与主导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
    }

    .header-topbar {
      background-color: var(--dark-slate);
      color: #94A3B8;
      font-size: 0.8125rem;
      padding: 6px 0;
    }

    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .topbar-items span {
      margin-right: 20px;
    }

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

    .brand-logo {
      font-size: 1.375rem;
      font-weight: 800;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 10px;
      letter-spacing: -0.5px;
    }

    .brand-logo svg {
      width: 28px;
      height: 28px;
      fill: var(--primary);
    }

    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
      align-items: center;
    }

    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-title);
    }

    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }

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

    .btn-header-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--cta);
      color: #FFFFFF;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.875rem;
      box-shadow: 0 2px 8px rgba(249, 115, 22, 0.25);
    }

    .btn-header-cta:hover {
      background: var(--cta-hover);
      transform: translateY(-1px);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    /* 通用板块排版 */
    section {
      padding: 96px 0;
    }

    .section-bg-white {
      background-color: var(--bg-white);
    }

    .section-bg-light {
      background-color: var(--bg-light);
    }

    .section-heading-box {
      max-width: 780px;
      margin-bottom: 56px;
    }

    .section-badge {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--accent);
      background: rgba(2, 132, 199, 0.08);
      padding: 6px 14px;
      border-radius: 999px;
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2.125rem;
      line-height: 1.28;
      font-weight: 800;
      color: var(--text-title);
      letter-spacing: -0.5px;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 模块1: Hero Section (左文右图 5:7 错位) */
    .hero-section {
      padding: 80px 0 100px;
      background: linear-gradient(180deg, #EFF6FF 0%, #F8FAFC 100%);
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
    }

    .hero-text-col h1 {
      font-size: 2.75rem;
      line-height: 1.2;
      font-weight: 900;
      color: var(--text-title);
      letter-spacing: -1px;
      margin-bottom: 20px;
    }

    .hero-description {
      font-size: 1.125rem;
      line-height: 1.8;
      color: var(--text-main);
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: var(--primary);
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 600;
      padding: 14px 30px;
      border-radius: var(--radius-sm);
      box-shadow: 0 4px 14px rgba(30, 64, 175, 0.25);
    }

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

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background-color: #FFFFFF;
      color: var(--text-title);
      font-size: 1rem;
      font-weight: 600;
      padding: 14px 28px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    .hero-metrics-pill {
      display: flex;
      gap: 32px;
      border-top: 1px solid rgba(226, 232, 240, 0.8);
      padding-top: 24px;
    }

    .metric-mini-item strong {
      display: block;
      font-size: 1.5rem;
      color: var(--primary);
      font-weight: 800;
      line-height: 1.2;
    }

    .metric-mini-item span {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    .hero-visual-col {
      position: relative;
    }

    .hero-main-frame {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 0 24px 50px -12px rgba(15, 23, 42, 0.18);
      border: 6px solid #FFFFFF;
      transform: perspective(1000px) rotateY(-4deg) rotateX(2deg);
      transition: transform 0.4s ease;
    }

    .hero-main-frame:hover {
      transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
    }

    /* 模块2: 品牌与体系 (左图右文) */
    .overview-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 64px;
      align-items: center;
    }

    .overview-visual {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }

    .overview-content p {
      font-size: 1.0625rem;
      color: var(--text-main);
      margin-bottom: 20px;
    }

    .tech-specs-box {
      background: #EFF6FF;
      border-left: 4px solid var(--primary);
      padding: 18px 24px;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      margin-top: 28px;
    }

    .tech-specs-box strong {
      display: block;
      color: var(--primary);
      margin-bottom: 6px;
      font-size: 0.9375rem;
    }

    .tech-specs-box p {
      margin-bottom: 0;
      font-size: 0.875rem;
      color: #1E293B;
    }

    /* 模块3: 核心优势矩阵 (3列x2行) */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .adv-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 36px 30px;
      box-shadow: var(--card-shadow);
      border: 1px solid rgba(226, 232, 240, 0.6);
      transition: all 0.3s ease;
    }

    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(30, 64, 175, 0.2);
    }

    .adv-icon-badge {
      width: 48px;
      height: 48px;
      background: #EFF6FF;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      margin-bottom: 22px;
      font-weight: 800;
      font-size: 1.25rem;
    }

    .adv-card h3 {
      font-size: 1.25rem;
      color: var(--text-title);
      margin-bottom: 12px;
      font-weight: 700;
    }

    .adv-card p {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 模块4: 热门方案展台 (3列卡片，高亮推荐) */
    .plans-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      align-items: stretch;
    }

    .plan-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 40px 32px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .plan-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 16px 36px -6px rgba(30, 64, 175, 0.16);
      transform: scale(1.03);
      z-index: 2;
    }

    .featured-tag {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: #FFFFFF;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 999px;
      letter-spacing: 0.05em;
    }

    .plan-title {
      font-size: 1.375rem;
      font-weight: 800;
      color: var(--text-title);
      margin-bottom: 8px;
    }

    .plan-sub {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 24px;
      height: 40px;
    }

    .plan-features-list {
      list-style: none;
      margin-bottom: 32px;
      flex-grow: 1;
    }

    .plan-features-list li {
      position: relative;
      padding-left: 24px;
      margin-bottom: 12px;
      font-size: 0.9375rem;
      color: var(--text-main);
    }

    .plan-features-list li::before {
      content: "✓";
      position: absolute;
      left: 0;
      color: var(--primary);
      font-weight: 900;
    }

    /* 模块5: 深色专业案例与理念区 */
    .dark-showcase-section {
      background-color: var(--dark-slate);
      color: #F8FAFC;
    }

    .dark-showcase-section .section-title {
      color: #FFFFFF;
    }

    .dark-showcase-section .section-desc {
      color: #94A3B8;
    }

    .dark-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }

    .dark-image-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid #334155;
    }

    .dark-text-list {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .dark-item h4 {
      font-size: 1.125rem;
      color: #38BDF8;
      margin-bottom: 8px;
    }

    .dark-item p {
      font-size: 0.9375rem;
      color: #CBD5E1;
      line-height: 1.65;
    }

    /* 模块6: 多端协同场景演示 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .scenario-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-color);
      transition: transform 0.3s ease;
    }

    .scenario-card:hover {
      transform: translateY(-4px);
    }

    .scenario-thumb {
      height: 170px;
      overflow: hidden;
      background: #E2E8F0;
    }

    .scenario-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .scenario-body {
      padding: 24px;
    }

    .scenario-body h3 {
      font-size: 1.125rem;
      color: var(--text-title);
      margin-bottom: 10px;
    }

    .scenario-body p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 模块7: 真实用户实践故事 */
    .story-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 48px;
      box-shadow: var(--card-shadow);
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 48px;
      align-items: center;
      border: 1px solid var(--border-color);
    }

    .story-left h3 {
      font-size: 1.625rem;
      color: var(--text-title);
      margin-bottom: 18px;
      font-weight: 800;
    }

    .story-left p {
      font-size: 1rem;
      color: var(--text-main);
      line-height: 1.75;
      margin-bottom: 24px;
    }

    .story-stats {
      display: flex;
      gap: 36px;
    }

    .story-stat-item strong {
      font-size: 1.875rem;
      color: var(--cta);
      font-weight: 800;
      display: block;
    }

    .story-stat-item span {
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    .story-right img {
      border-radius: var(--radius-sm);
    }

    /* 模块8: 核心业务数据统计条 */
    .data-strip-section {
      background: linear-gradient(135deg, #1E40AF 0%, #0369A1 100%);
      color: #FFFFFF;
      padding: 64px 0;
    }

    .metrics-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .data-strip-item strong {
      display: block;
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.1;
      margin-bottom: 8px;
      color: #F8FAFC;
    }

    .data-strip-item span {
      font-size: 0.9375rem;
      color: #BAE6FD;
      font-weight: 500;
    }

    /* 模块9: 评价证言区 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .review-card {
      background: var(--bg-white);
      padding: 36px 30px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-body {
      font-size: 0.9375rem;
      color: var(--text-main);
      line-height: 1.7;
      margin-bottom: 24px;
      font-style: italic;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }

    .reviewer-name {
      font-weight: 700;
      font-size: 0.9375rem;
      color: var(--text-title);
    }

    .reviewer-title {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 模块10: 资讯与行业实录 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .news-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
    }

    .news-date {
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin-bottom: 10px;
    }

    .news-title {
      font-size: 1.0625rem;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 12px;
      line-height: 1.4;
    }

    .news-excerpt {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 模块11: FAQ 手风琴 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    details.faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: all 0.2s ease;
    }

    details.faq-item[open] {
      border-color: var(--primary);
      box-shadow: var(--card-shadow);
    }

    summary.faq-question {
      padding: 20px 24px;
      font-weight: 700;
      font-size: 1.0625rem;
      color: var(--text-title);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    summary.faq-question::-webkit-details-marker {
      display: none;
    }

    summary.faq-question::after {
      content: "+";
      font-size: 1.375rem;
      color: var(--text-muted);
      transition: transform 0.2s;
    }

    details.faq-item[open] summary.faq-question::after {
      content: "-";
      color: var(--primary);
    }

    .faq-answer {
      padding: 0 24px 22px;
      font-size: 0.9375rem;
      color: var(--text-main);
      line-height: 1.7;
    }

    /* 模块12: 服务承诺与保障条 */
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .guarantee-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      text-align: center;
    }

    .guarantee-card h4 {
      font-size: 1.0625rem;
      color: var(--text-title);
      margin-bottom: 8px;
      font-weight: 700;
    }

    .guarantee-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 模块13: 咨询与留资表单收口 */
    .cta-card {
      background: linear-gradient(135deg, #0F172A 0%, #1E3A8A 100%);
      border-radius: var(--radius-md);
      padding: 64px 56px;
      color: #FFFFFF;
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 48px;
      align-items: center;
      box-shadow: 0 20px 40px -10px rgba(15, 23, 42, 0.3);
    }

    .cta-info h2 {
      font-size: 2.125rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 18px;
      color: #FFFFFF;
    }

    .cta-info p {
      font-size: 1rem;
      color: #CBD5E1;
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .cta-feature-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .cta-feature-pills span {
      background: rgba(255, 255, 255, 0.12);
      padding: 6px 14px;
      border-radius: 999px;
      font-size: 0.8125rem;
      color: #E2E8F0;
    }

    .lead-form-box {
      background: #FFFFFF;
      padding: 36px 32px;
      border-radius: var(--radius-sm);
      color: var(--text-title);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      height: 44px;
      padding: 8px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.9375rem;
      color: var(--text-title);
      outline: none;
      transition: border-color 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
    }

    .btn-submit {
      width: 100%;
      height: 48px;
      background: var(--cta);
      color: #FFFFFF;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 1rem;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
      transition: background 0.2s;
    }

    .btn-submit:hover {
      background: var(--cta-hover);
    }

    /* 页脚 */
    footer.site-footer {
      background-color: var(--dark-slate);
      color: #94A3B8;
      padding-top: 72px;
      border-top: 1px solid #1E293B;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 48px;
      padding-bottom: 56px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .footer-col p {
      font-size: 0.875rem;
      line-height: 1.7;
      margin-bottom: 16px;
    }

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

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

    .footer-links a {
      font-size: 0.875rem;
      color: #94A3B8;
    }

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

    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding: 24px 0;
      font-size: 0.8125rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .overview-grid {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .plans-grid {
        grid-template-columns: 1fr;
      }
      .plan-card.featured {
        transform: none;
      }
      .dark-grid {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .scenario-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cta-card {
        grid-template-columns: 1fr;
        padding: 40px 28px;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      .topbar-content {
        flex-direction: column;
        gap: 4px;
        text-align: center;
      }
      .topbar-items span {
        margin: 0 6px;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-text-col h1 {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.625rem;
      }
      .advantages-grid {
        grid-template-columns: 1fr;
      }
      .story-card {
        grid-template-columns: 1fr;
        padding: 28px 20px;
      }
      .metrics-row {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
      }
      .data-strip-item strong {
        font-size: 2.25rem;
      }
      .reviews-grid {
        grid-template-columns: 1fr;
      }
      .scenario-grid {
        grid-template-columns: 1fr;
      }
      .news-grid {
        grid-template-columns: 1fr;
      }
      .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }

    @media (max-width: 520px) {
      .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .hero-actions {
        flex-direction: column;
      }
      .hero-actions a {
        width: 100%;
      }
    }