/* roulang page: index */
:root {
      --primary: #1E56A0;
      --primary-hover: #16437E;
      --accent: #00B4D8;
      --accent-green: #10B981;
      --dark-surface: #0F172A;
      --dark-card: #1E293B;
      --page-bg: #F8FAFC;
      --white: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
      --shadow-lg: 0 20px 25px -5px rgba(30, 86, 160, 0.08), 0 10px 10px -5px rgba(30, 86, 160, 0.04);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --transition: all 0.25s ease-in-out;
    }

    * {
      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(--page-bg);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }

    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;
    }

    /* 顶部通栏与主导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

    .top-bar {
      background: #F1F5F9;
      border-bottom: 1px solid #E2E8F0;
      font-size: 13px;
      color: var(--text-muted);
      padding: 6px 0;
      transition: max-height 0.3s ease, opacity 0.3s ease;
      overflow: hidden;
    }
    .top-bar.hide {
      max-height: 0;
      opacity: 0;
      padding: 0;
      border-bottom: none;
    }
    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-tags span {
      margin-right: 18px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .main-nav {
      padding: 16px 0;
    }
    .main-nav .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .brand-logo svg {
      width: 32px;
      height: 32px;
      fill: var(--primary);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 28px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--primary);
      color: var(--white);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(30, 86, 160, 0.25);
    }
    .btn-outline {
      background: transparent;
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(30, 86, 160, 0.05);
    }
    .btn-sm {
      padding: 6px 14px;
      font-size: 13px;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    /* 板块公用样式 */
    section {
      padding: 96px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 56px;
    }
    .section-badge {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      background: rgba(30, 86, 160, 0.08);
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .card {
      background: var(--white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      overflow: hidden;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(30, 86, 160, 0.2);
    }

    /* 1. Hero 蓝图：左文右图 5:7 斜向错位 */
    .hero-section {
      padding: 90px 0 110px;
      background: linear-gradient(180deg, #FFFFFF 0%, #F1F5F9 100%);
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      align-items: center;
      gap: 50px;
    }
    .hero-content h1 {
      font-size: 38px;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-content h1 span {
      color: var(--primary);
    }
    .hero-lead {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 32px;
      text-align: justify;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 40px;
    }
    .hero-kpis {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      padding-top: 24px;
      border-top: 1px solid var(--border-color);
    }
    .hero-kpi-item b {
      display: block;
      font-size: 24px;
      color: var(--primary);
      font-weight: 700;
    }
    .hero-kpi-item span {
      font-size: 12px;
      color: var(--text-muted);
    }

    .hero-visual {
      position: relative;
    }
    .hero-visual-frame {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.18);
      border: 6px solid var(--white);
      transform: rotate(1deg);
      transition: var(--transition);
    }
    .hero-visual-frame:hover {
      transform: rotate(0deg) scale(1.01);
    }
    .hero-floating-card {
      position: absolute;
      bottom: -24px;
      left: -20px;
      background: var(--white);
      padding: 18px 22px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .hero-floating-icon {
      width: 44px;
      height: 44px;
      background: rgba(16, 185, 129, 0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-green);
    }

    /* 2. KPI 看板 */
    .metrics-section {
      background: var(--white);
      padding: 50px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      padding: 24px;
      text-align: center;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      background: var(--page-bg);
    }
    .metric-val {
      font-size: 36px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
      letter-spacing: -0.5px;
    }
    .metric-name {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .metric-desc {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 3. 服务矩阵 */
    .services-section {
      background: var(--page-bg);
    }
    .service-split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .service-intro-box {
      padding-right: 20px;
    }
    .spec-param-badge {
      display: inline-block;
      padding: 6px 14px;
      background: #E0F2FE;
      color: #0369A1;
      font-size: 13px;
      font-weight: 600;
      border-radius: 6px;
      margin: 18px 0;
    }
    .service-list-items {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .service-item-row {
      display: flex;
      gap: 18px;
      padding: 20px;
      background: var(--white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }
    .service-icon-wrap {
      width: 46px;
      height: 46px;
      flex-shrink: 0;
      background: rgba(30, 86, 160, 0.08);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
    }
    .service-item-row h3 {
      font-size: 18px;
      margin-bottom: 6px;
    }
    .service-item-row p {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 4. 核心功能 6宫格 */
    .features-section {
      background: var(--white);
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .feature-card {
      padding: 32px 28px;
    }
    .feature-icon-circle {
      width: 54px;
      height: 54px;
      background: #EFF6FF;
      color: var(--primary);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 22px;
    }
    .feature-card h3 {
      font-size: 19px;
      margin-bottom: 12px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 5. 解决方案矩阵 */
    .solutions-section {
      background: #F1F5F9;
    }
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .solution-card-body {
      padding: 24px;
    }
    .solution-cover {
      height: 200px;
      overflow: hidden;
    }
    .solution-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .card:hover .solution-cover img {
      transform: scale(1.05);
    }
    .solution-tag {
      font-size: 12px;
      color: var(--primary);
      font-weight: 700;
      text-transform: uppercase;
      margin-bottom: 8px;
      display: block;
    }
    .solution-card-body h3 {
      font-size: 19px;
      margin-bottom: 12px;
    }
    .solution-card-body p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 18px;
    }

    /* 6. 深色理念区 */
    .philosophy-section {
      background: var(--dark-surface);
      color: var(--white);
    }
    .philosophy-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .philosophy-left h2 {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.35;
      margin-bottom: 20px;
      color: var(--white);
    }
    .philosophy-left p {
      color: #94A3B8;
      font-size: 15px;
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .philosophy-panel {
      background: var(--dark-card);
      border: 1px solid #334155;
      border-radius: var(--radius-md);
      padding: 30px;
    }
    .pipeline-step {
      display: flex;
      gap: 16px;
      margin-bottom: 22px;
    }
    .pipeline-step:last-child {
      margin-bottom: 0;
    }
    .pipeline-num {
      width: 36px;
      height: 36px;
      background: rgba(0, 180, 216, 0.15);
      color: var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }
    .pipeline-text h4 {
      font-size: 16px;
      color: #F8FAFC;
      margin-bottom: 4px;
    }
    .pipeline-text p {
      font-size: 13px;
      color: #94A3B8;
      line-height: 1.5;
    }

    /* 7. 成效对比 */
    .case-section {
      background: var(--white);
    }
    .compare-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .compare-card {
      padding: 32px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }
    .compare-card.before {
      background: #FFFBEB;
      border-color: #FDE68A;
    }
    .compare-card.after {
      background: #F0FDF4;
      border-color: #BBF7D0;
    }
    .compare-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .compare-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .compare-list li {
      font-size: 14px;
      color: var(--text-muted);
      position: relative;
      padding-left: 20px;
    }
    .compare-list li::before {
      content: "•";
      position: absolute;
      left: 6px;
      font-size: 18px;
      line-height: 1;
    }

    /* 8. 里程碑 */
    .milestones-section {
      background: var(--page-bg);
    }
    .timeline-wrap {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .timeline-item {
      background: var(--white);
      padding: 24px;
      border-radius: var(--radius-md);
      border-top: 4px solid var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .timeline-phase {
      font-size: 12px;
      font-weight: 700;
      color: var(--accent);
      text-transform: uppercase;
      margin-bottom: 6px;
    }
    .timeline-item h3 {
      font-size: 17px;
      margin-bottom: 10px;
    }
    .timeline-item p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 9. 资讯动态 */
    .insights-section {
      background: var(--white);
    }
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .insight-card .thumb {
      height: 180px;
      overflow: hidden;
    }
    .insight-card .thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .insight-body {
      padding: 22px;
    }
    .insight-meta {
      font-size: 12px;
      color: #94A3B8;
      margin-bottom: 8px;
    }
    .insight-body h3 {
      font-size: 17px;
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .insight-body p {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 10. 平台保障 */
    .compliance-section {
      background: #F8FAFC;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .compliance-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .compliance-item {
      text-align: center;
      padding: 28px 20px;
      background: var(--white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }
    .compliance-item svg {
      width: 42px;
      height: 42px;
      fill: var(--accent-green);
      margin-bottom: 16px;
    }
    .compliance-item h3 {
      font-size: 16px;
      margin-bottom: 8px;
    }
    .compliance-item p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 11. FAQ 手风琴 */
    .faq-section {
      background: var(--white);
    }
    .accordion-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .accordion-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      background: var(--white);
    }
    .accordion-header {
      width: 100%;
      padding: 20px 24px;
      text-align: left;
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
    }
    .accordion-header svg {
      width: 18px;
      height: 18px;
      fill: var(--text-muted);
      transition: transform 0.3s ease;
    }
    .accordion-header[aria-expanded="true"] svg {
      transform: rotate(180deg);
      fill: var(--primary);
    }
    .accordion-collapse {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }
    .accordion-body {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 12. 转化对接 */
    .contact-section {
      background: linear-gradient(135deg, #1E56A0 0%, #0F172A 100%);
      color: var(--white);
    }
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .contact-info h2 {
      font-size: 32px;
      margin-bottom: 20px;
      color: var(--white);
    }
    .contact-info p {
      color: #CBD5E1;
      font-size: 16px;
      margin-bottom: 30px;
    }
    .contact-direct {
      background: rgba(255, 255, 255, 0.08);
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.15);
    }
    .contact-direct span {
      font-size: 13px;
      color: #94A3B8;
      display: block;
    }
    .contact-direct strong {
      font-size: 24px;
      color: var(--white);
      letter-spacing: 0.5px;
    }

    .contact-form-box {
      background: var(--white);
      padding: 36px;
      border-radius: var(--radius-md);
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
      color: var(--text-main);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(30, 86, 160, 0.15);
    }

    /* 页脚 */
    .site-footer {
      background: #0B1120;
      color: #94A3B8;
      padding: 60px 0 30px;
      font-size: 14px;
      border-top: 1px solid #1E293B;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand h4 {
      color: var(--white);
      font-size: 18px;
      margin-bottom: 14px;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 16px;
    }
    .footer-col h5 {
      color: var(--white);
      font-size: 15px;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: var(--white);
    }
    .footer-bottom {
      padding-top: 24px;
      border-top: 1px solid #1E293B;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .metrics-grid, .features-grid, .solutions-grid, .compliance-grid, .timeline-wrap, .insights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .service-split, .philosophy-grid, .compare-container, .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 767px) {
      section {
        padding: 56px 0;
      }
      .top-bar {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .nav-menu {
        position: fixed;
        top: 65px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        gap: 18px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 15px rgba(0,0,0,0.05);
        display: none;
      }
      .nav-menu.show {
        display: flex;
      }
      .metrics-grid, .features-grid, .solutions-grid, .compliance-grid, .timeline-wrap, .insights-grid {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 28px;
      }
      .hero-kpis {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }