/* roulang page: index */
:root {
      --color-primary: #0F4C81;
      --color-primary-light: #1A64A5;
      --color-accent: #FF6B35;
      --color-accent-hover: #E85924;
      --color-bg-light: #F7F9FC;
      --color-surface: #FFFFFF;
      --color-bg-dark: #0B1E33;
      --color-text-title: #1A202C;
      --color-text-body: #4A5568;
      --color-text-muted: #718096;
      --color-border: #E2E8F0;
      --radius-sm: 4px;
      --radius-md: 8px;
      --shadow-sm: 0 2px 8px rgba(15, 76, 129, 0.06);
      --shadow-hover: 0 8px 24px rgba(15, 76, 129, 0.12);
      --transition: all 0.25s ease-in-out;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: PingFang SC, "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      font-size: 16px;
      color: var(--color-text-body);
      background-color: var(--color-bg-light);
    }

    body {
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部运营条 */
    .topbar {
      height: 36px;
      background-color: #EDF2F7;
      border-bottom: 1px solid var(--color-border);
      font-size: 13px;
      color: var(--color-text-muted);
      display: flex;
      align-items: center;
    }
    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .topbar-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .topbar-badge::before {
      content: "";
      display: inline-block;
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background-color: #38A169;
    }

    /* 主导航 */
    .header-main {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: var(--color-surface);
      border-bottom: 1px solid var(--color-border);
      box-shadow: 0 1px 4px rgba(0,0,0,0.03);
    }
    .nav-bar {
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .nav-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 700;
      color: var(--color-primary);
      letter-spacing: -0.5px;
    }
    .nav-logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 18px;
      font-weight: 800;
    }
    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
    }
    .nav-item a {
      font-size: 15px;
      font-weight: 500;
      color: var(--color-text-title);
      padding: 8px 0;
      position: relative;
    }
    .nav-item a:hover {
      color: var(--color-primary);
    }
    .nav-cta {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--color-accent);
      color: #FFFFFF;
      box-shadow: 0 3px 10px rgba(255, 107, 53, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--color-accent-hover);
      box-shadow: 0 5px 15px rgba(255, 107, 53, 0.35);
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--color-primary);
      color: var(--color-primary);
    }
    .btn-outline:hover {
      background-color: var(--color-primary);
      color: #FFFFFF;
    }
    .nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--color-text-title);
    }

    /* 通用板块与排版 */
    section {
      padding: 72px 0;
    }
    .section-alt {
      background-color: var(--color-surface);
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 48px;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      color: var(--color-primary);
      background-color: rgba(15, 76, 129, 0.08);
      padding: 4px 12px;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--color-text-title);
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      line-height: 1.7;
      color: var(--color-text-muted);
    }

    /* 板块 1: Hero */
    .hero-section {
      padding: 80px 0 90px;
      background-color: #F0F4F8;
      background-image: linear-gradient(180deg, #EBF1F6 0%, #F7F9FC 100%);
      position: relative;
      border-bottom: 1px solid var(--color-border);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-title {
      font-size: 42px;
      font-weight: 700;
      color: var(--color-text-title);
      line-height: 1.25;
      margin-bottom: 20px;
    }
    .hero-title span {
      color: var(--color-primary);
    }
    .hero-desc {
      font-size: 16px;
      line-height: 1.8;
      color: var(--color-text-body);
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
    }
    .hero-meta {
      display: flex;
      align-items: center;
      gap: 24px;
      font-size: 13px;
      color: var(--color-text-muted);
      border-top: 1px solid var(--color-border);
      padding-top: 20px;
    }
    .hero-meta-item {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .hero-visual {
      background-color: var(--color-surface);
      border-radius: var(--radius-md);
      box-shadow: 0 16px 36px rgba(15, 76, 129, 0.08);
      border: 1px solid var(--color-border);
      overflow: hidden;
      position: relative;
    }
    .hero-visual img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .hero-visual-badge {
      position: absolute;
      bottom: 16px;
      left: 16px;
      right: 16px;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      padding: 12px 18px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-sm);
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 14px;
      font-weight: 600;
      color: var(--color-primary);
    }

    /* 板块 2: 品牌与架构底座 */
    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .arch-image {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--color-border);
    }
    .arch-image img {
      width: 100%;
      height: 360px;
      object-fit: cover;
    }
    .arch-content h3 {
      font-size: 26px;
      font-weight: 700;
      color: var(--color-text-title);
      margin-bottom: 18px;
      line-height: 1.4;
    }
    .arch-content p {
      font-size: 15px;
      line-height: 1.8;
      color: var(--color-text-body);
      margin-bottom: 20px;
    }
    .arch-spec {
      background-color: #EDF4FA;
      border-left: 4px solid var(--color-primary);
      padding: 14px 18px;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      font-size: 14px;
      color: #1A446C;
      font-weight: 500;
      line-height: 1.6;
    }

    /* 板块 3: 核心技术优势 (6卡片) */
    .cards-grid-6 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background-color: var(--color-surface);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      border: 1px solid var(--color-border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .feature-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .feature-card-icon {
      width: 48px;
      height: 48px;
      border-radius: 6px;
      background-color: rgba(15, 76, 129, 0.08);
      color: var(--color-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--color-text-title);
      margin-bottom: 12px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--color-text-body);
      line-height: 1.75;
    }

    /* 板块 4: 产品矩阵 (3卡片) */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .matrix-card {
      background-color: var(--color-bg-light);
      border-radius: var(--radius-md);
      padding: 36px 28px;
      border: 1px solid var(--color-border);
      display: flex;
      flex-direction: column;
      position: relative;
      transition: var(--transition);
    }
    .matrix-card.featured {
      background-color: var(--color-surface);
      border-color: var(--color-primary);
      box-shadow: var(--shadow-hover);
    }
    .matrix-badge {
      position: absolute;
      top: -12px;
      right: 24px;
      background-color: var(--color-accent);
      color: #fff;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 20px;
    }
    .matrix-card h3 {
      font-size: 20px;
      font-weight: 700;
      color: var(--color-text-title);
      margin-bottom: 12px;
    }
    .matrix-card p.matrix-desc {
      font-size: 14px;
      color: var(--color-text-muted);
      margin-bottom: 24px;
      line-height: 1.6;
    }
    .matrix-list {
      list-style: none;
      margin-bottom: 28px;
      flex-grow: 1;
    }
    .matrix-list li {
      font-size: 14px;
      color: var(--color-text-body);
      padding: 8px 0;
      border-bottom: 1px dashed var(--color-border);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .matrix-list li::before {
      content: "✓";
      color: var(--color-primary);
      font-weight: 700;
    }

    /* 板块 5: 业务落地流程 (4步) */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .flow-card {
      background-color: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      position: relative;
    }
    .flow-number {
      font-size: 32px;
      font-weight: 800;
      color: rgba(15, 76, 129, 0.15);
      line-height: 1;
      margin-bottom: 14px;
    }
    .flow-card h3 {
      font-size: 17px;
      font-weight: 700;
      color: var(--color-text-title);
      margin-bottom: 10px;
    }
    .flow-card p {
      font-size: 14px;
      color: var(--color-text-muted);
      line-height: 1.6;
    }

    /* 板块 6: 深色高可用架构理念 */
    .dark-section {
      background-color: var(--color-bg-dark);
      color: #FFFFFF;
      position: relative;
      overflow: hidden;
    }
    .dark-section .section-title {
      color: #FFFFFF;
    }
    .dark-section .section-desc {
      color: #A0AEC0;
    }
    .dark-section .section-tag {
      background-color: rgba(255, 255, 255, 0.1);
      color: #FF8F66;
    }
    .dark-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .dark-text h3 {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 18px;
      line-height: 1.4;
      color: #FFFFFF;
    }
    .dark-text p {
      font-size: 15px;
      line-height: 1.8;
      color: #CBD5E0;
      margin-bottom: 24px;
    }
    .dark-pillars {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .pillar-item {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-sm);
      padding: 18px;
    }
    .pillar-item h4 {
      font-size: 15px;
      font-weight: 600;
      color: #FFFFFF;
      margin-bottom: 6px;
    }
    .pillar-item p {
      font-size: 13px;
      color: #A0AEC0;
      line-height: 1.5;
      margin: 0;
    }

    /* 板块 7: 典型业态解决方案 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .scenario-card {
      background-color: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .scenario-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .scenario-card img {
      width: 100%;
      height: 160px;
      object-fit: cover;
    }
    .scenario-body {
      padding: 20px;
    }
    .scenario-body h3 {
      font-size: 17px;
      font-weight: 700;
      color: var(--color-text-title);
      margin-bottom: 8px;
    }
    .scenario-body p {
      font-size: 13px;
      color: var(--color-text-body);
      line-height: 1.6;
    }

    /* 板块 8: 量化数据条 */
    .metrics-bar {
      background-color: var(--color-primary);
      color: #FFFFFF;
      padding: 56px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-item {
      border-right: 1px solid rgba(255, 255, 255, 0.15);
      padding: 0 16px;
    }
    .metric-item:last-child {
      border-right: none;
    }
    .metric-value {
      font-size: 40px;
      font-weight: 800;
      color: var(--color-accent);
      line-height: 1.2;
      margin-bottom: 8px;
    }
    .metric-label {
      font-size: 16px;
      font-weight: 600;
      color: #FFFFFF;
      margin-bottom: 6px;
    }
    .metric-sub {
      font-size: 13px;
      color: rgba(255, 255, 255, 0.7);
    }

    /* 板块 9: 客户见证与口碑 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background-color: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .review-stars {
      color: #ECC94B;
      font-size: 16px;
      margin-bottom: 14px;
      letter-spacing: 2px;
    }
    .review-text {
      font-size: 14px;
      line-height: 1.75;
      color: var(--color-text-body);
      margin-bottom: 20px;
      flex-grow: 1;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--color-border);
      padding-top: 16px;
    }
    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background-color: rgba(15, 76, 129, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--color-primary);
    }
    .review-info h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--color-text-title);
    }
    .review-info p {
      font-size: 12px;
      color: var(--color-text-muted);
    }

    /* 板块 10: 行业动态与资讯 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background-color: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .news-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .news-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .news-date {
      font-size: 12px;
      color: var(--color-text-muted);
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--color-text-title);
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .news-summary {
      font-size: 13px;
      color: var(--color-text-body);
      line-height: 1.6;
      margin-bottom: 20px;
      flex-grow: 1;
    }
    .news-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--color-primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 板块 11: 常见问题 FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background-color: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--color-text-title);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-icon {
      font-size: 18px;
      color: var(--color-text-muted);
      transition: var(--transition);
    }
    .faq-answer {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--color-text-body);
      line-height: 1.75;
      display: block;
    }
    .faq-item:not(.active) .faq-answer {
      display: none;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--color-accent);
    }

    /* 板块 12: 底部获客与转化保障区 */
    .cta-card {
      background: linear-gradient(135deg, var(--color-primary) 0%, #0A3258 100%);
      border-radius: var(--radius-md);
      padding: 60px 48px;
      color: #FFFFFF;
      text-align: center;
      box-shadow: 0 16px 36px rgba(15, 76, 129, 0.15);
      margin-bottom: 40px;
    }
    .cta-card h2 {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .cta-card p {
      font-size: 16px;
      color: #CBD5E0;
      max-width: 650px;
      margin: 0 auto 32px;
      line-height: 1.7;
    }
    .cta-form {
      display: flex;
      max-width: 520px;
      margin: 0 auto 24px;
      gap: 10px;
    }
    .cta-input {
      flex: 1;
      padding: 12px 18px;
      font-size: 15px;
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: var(--radius-sm);
      outline: none;
      background: #FFFFFF;
      color: var(--color-text-title);
    }
    .cta-input:focus {
      border-color: var(--color-accent);
    }
    .cta-privacy {
      font-size: 12px;
      color: #A0AEC0;
    }
    .trust-badges {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }
    .trust-item {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      padding: 20px;
    }
    .trust-item h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--color-text-title);
      margin-bottom: 6px;
    }
    .trust-item p {
      font-size: 12px;
      color: var(--color-text-muted);
      margin: 0;
    }

    /* 页脚 Footer */
    .site-footer {
      background-color: var(--color-bg-dark);
      color: #A0AEC0;
      padding: 64px 0 32px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 14px;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 18px;
    }
    .footer-col p {
      line-height: 1.7;
      margin-bottom: 12px;
      font-size: 13px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 28px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      font-size: 12px;
      text-align: center;
    }
    .footer-bottom a {
      color: #A0AEC0;
    }
    .footer-bottom a:hover {
      color: #FFFFFF;
    }

    /* 响应式样式 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .arch-grid, .dark-grid {
        grid-template-columns: 1fr;
      }
      .cards-grid-6 {
        grid-template-columns: repeat(2, 1fr);
      }
      .matrix-grid, .reviews-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenario-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .topbar {
        display: none;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background-color: var(--color-surface);
        flex-direction: column;
        padding: 20px 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--color-border);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-toggle {
        display: block;
      }
      .nav-cta {
        display: none;
      }
      .hero-title {
        font-size: 32px;
      }
      .section-title {
        font-size: 26px;
      }
      .cards-grid-6, .matrix-grid, .flow-steps, .scenario-grid, .metrics-grid, .reviews-grid, .news-grid, .trust-badges {
        grid-template-columns: 1fr;
      }
      .metric-item {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.15);
        padding-bottom: 16px;
      }
      .metric-item:last-child {
        border-bottom: none;
      }
      .cta-form {
        flex-direction: column;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }