/* roulang page: index */
:root {
      --color-primary: #0F52BA;
      --color-secondary: #00A86B;
      --color-accent: #4F46E5;
      --color-emerald: #10B981;
      --color-bg-light: #F8FAFC;
      --color-bg-subtle: #F1F5F9;
      --color-surface: #FFFFFF;
      --color-dark: #0B0F19;
      --color-dark-card: #151C2C;
      --color-text-main: #0F172A;
      --color-text-muted: #334155;
      --color-text-light: #64748B;
      --color-border: #E2E8F0;
      --radius-sm: 8px;
      --radius-lg: 18px;
      --radius-xl: 24px;
      --radius-pill: 9999px;
      --shadow-sm: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 16px 36px -4px rgba(15, 82, 186, 0.16);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--color-bg-light);
      color: var(--color-text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      width: 100%;
    }

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

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

    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部导航辅助条与主导航条 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--color-border);
      transition: var(--transition);
    }

    .top-status-bar {
      background: #0B1120;
      color: #94A3B8;
      font-size: 12px;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

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

    .status-indicator {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .dot-live {
      width: 8px;
      height: 8px;
      background-color: var(--color-emerald);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--color-emerald);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 19px;
      color: var(--color-text-main);
      letter-spacing: -0.02em;
    }

    .logo-badge {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #ffffff;
      font-weight: 800;
      font-size: 18px;
      box-shadow: 0 4px 12px rgba(15, 82, 186, 0.3);
    }

    .nav-links {
      display: flex;
      list-style: none;
      align-items: center;
      gap: 24px;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--color-text-muted);
      position: relative;
    }

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

    .cta-btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
      color: #ffffff;
      border-radius: var(--radius-pill);
      font-size: 14px;
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(15, 82, 186, 0.25);
      border: none;
      cursor: pointer;
      transition: var(--transition);
      white-space: nowrap;
    }

    .cta-btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(15, 82, 186, 0.38);
      color: #ffffff;
    }

    .cta-btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      background: rgba(255, 255, 255, 0.9);
      color: var(--color-text-main);
      border-radius: var(--radius-pill);
      font-size: 14px;
      font-weight: 600;
      border: 1px solid var(--color-border);
      cursor: pointer;
      transition: var(--transition);
    }

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

    /* 板块通用标准 */
    .section-spacing {
      padding: 96px 0;
    }

    .section-spacing-alt {
      background-color: var(--color-bg-subtle);
      border-top: 1px solid var(--color-border);
      border-bottom: 1px solid var(--color-border);
    }

    .section-header-block {
      max-width: 820px;
      margin: 0 auto 56px auto;
      text-align: center;
    }

    .badge-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: rgba(15, 82, 186, 0.08);
      border: 1px solid rgba(15, 82, 186, 0.15);
      color: var(--color-primary);
      padding: 6px 14px;
      border-radius: var(--radius-pill);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 16px;
      letter-spacing: 0.02em;
    }

    .section-title {
      font-size: 34px;
      font-weight: 800;
      line-height: 1.3;
      color: var(--color-text-main);
      margin-bottom: 18px;
      letter-spacing: -0.01em;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--color-text-muted);
      line-height: 1.7;
    }

    /* 1. 首屏 KV 板块 */
    .hero-section {
      position: relative;
      background: linear-gradient(rgba(11, 15, 25, 0.78), rgba(11, 15, 25, 0.88)), url('/assets/images/b99f95be3040fb54.jpg') center/cover no-repeat;
      color: #ffffff;
      padding: 120px 0 100px 0;
      overflow: hidden;
    }

    .hero-content {
      max-width: 880px;
      margin: 0 auto;
      text-align: center;
    }

    .hero-h1 {
      font-size: 46px;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.02em;
      margin-bottom: 24px;
      background: linear-gradient(135deg, #FFFFFF 60%, #A7F3D0 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-description {
      font-size: 18px;
      line-height: 1.8;
      color: #CBD5E1;
      margin-bottom: 36px;
      text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
    }

    .hero-countdown-strip {
      display: inline-flex;
      align-items: center;
      gap: 16px;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.16);
      backdrop-filter: blur(8px);
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      margin-bottom: 36px;
      font-size: 14px;
    }

    .countdown-timer {
      font-variant-numeric: tabular-nums;
      font-weight: 700;
      color: #38BDF8;
      background: rgba(15, 23, 42, 0.6);
      padding: 4px 10px;
      border-radius: 6px;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    /* 2. 技术架构底座介绍区 */
    .about-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .spec-sheet-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-xl);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .spec-item {
      display: flex;
      justify-content: space-between;
      padding: 14px 0;
      border-bottom: 1px dashed var(--color-border);
      font-size: 14px;
    }

    .spec-item:last-child {
      border-bottom: none;
    }

    .spec-label {
      color: var(--color-text-light);
      font-weight: 500;
    }

    .spec-value {
      font-weight: 700;
      color: var(--color-primary);
    }

    /* 3. 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }

    .metric-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(15, 82, 186, 0.3);
    }

    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    }

    .metric-number {
      font-size: 40px;
      font-weight: 800;
      color: var(--color-text-main);
      line-height: 1.1;
      margin-bottom: 8px;
    }

    .metric-unit {
      font-size: 18px;
      color: var(--color-primary);
      margin-left: 2px;
    }

    .metric-title {
      font-size: 16px;
      font-weight: 600;
      color: var(--color-text-main);
      margin-bottom: 6px;
    }

    .metric-desc {
      font-size: 13px;
      color: var(--color-text-light);
    }

    /* 4. 服务矩阵与能力全景 (2x3 卡片) */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .service-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-xl);
      padding: 36px 30px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(15, 82, 186, 0.4);
    }

    .service-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(15, 82, 186, 0.1), rgba(0, 168, 107, 0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      font-size: 22px;
      color: var(--color-primary);
      font-weight: bold;
    }

    .service-card h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--color-text-main);
    }

    .service-card p {
      font-size: 14px;
      color: var(--color-text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .badge-soft {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      padding: 4px 10px;
      border-radius: var(--radius-pill);
      background: var(--color-bg-subtle);
      color: var(--color-text-light);
      width: fit-content;
      font-weight: 500;
    }

    /* 5. 热门产品与解决方案 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .solution-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .solution-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
    }

    .solution-img-box {
      height: 200px;
      overflow: hidden;
    }

    .solution-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .solution-card:hover .solution-img-box img {
      transform: scale(1.05);
    }

    .solution-body {
      padding: 30px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    .checklist-list {
      list-style: none;
      margin: 20px 0 28px 0;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .checklist-item {
      font-size: 14px;
      color: var(--color-text-muted);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .checklist-item::before {
      content: "✓";
      color: var(--color-emerald);
      font-weight: 800;
      font-size: 14px;
    }

    /* 6. 深色案例与拓扑理念区 */
    .dark-case-section {
      background-color: var(--color-dark);
      color: #ffffff;
      padding: 100px 0;
    }

    .dark-case-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 56px;
      align-items: center;
    }

    .dark-case-desc {
      font-size: 15px;
      color: #94A3B8;
      line-height: 1.8;
      margin-bottom: 28px;
    }

    .latency-strip {
      display: flex;
      gap: 20px;
      margin-top: 32px;
    }

    .latency-node {
      background: var(--color-dark-card);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 16px 20px;
      border-radius: var(--radius-md);
      flex: 1;
    }

    .latency-node .node-title {
      font-size: 12px;
      color: #64748B;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .latency-node .node-value {
      font-size: 22px;
      font-weight: 700;
      color: #38BDF8;
      margin-top: 4px;
    }

    /* 7. 技术演进与实施里程碑 */
    .milestones-track {
      position: relative;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .milestone-step-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      position: relative;
    }

    .milestone-order {
      font-size: 28px;
      font-weight: 800;
      color: rgba(15, 82, 186, 0.15);
      line-height: 1;
      margin-bottom: 12px;
    }

    .milestone-step-card h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--color-text-main);
    }

    .milestone-step-card p {
      font-size: 13px;
      color: var(--color-text-muted);
      line-height: 1.6;
    }

    /* 8. 客户成效对比区 */
    .comparison-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .comparison-column {
      background: var(--color-surface);
      border-radius: var(--radius-xl);
      border: 1px solid var(--color-border);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .comparison-column.highlight {
      border: 2px solid var(--color-primary);
      position: relative;
    }

    .comparison-column.highlight::before {
      content: "推荐体系";
      position: absolute;
      top: -14px;
      right: 28px;
      background: var(--color-primary);
      color: #ffffff;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
    }

    .comparison-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 0;
      border-bottom: 1px solid var(--color-border);
      font-size: 14px;
    }

    .comparison-row:last-child {
      border-bottom: none;
    }

    /* 9. 标杆企业故事区 */
    .story-container {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 48px;
      align-items: center;
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-xl);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .quote-box {
      border-left: 3px solid var(--color-primary);
      padding-left: 18px;
      margin: 20px 0;
      font-style: italic;
      color: var(--color-text-muted);
      font-size: 15px;
    }

    /* 10. 客户评价网格 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .testimonial-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-xl);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-rating {
      color: #F59E0B;
      font-size: 16px;
      margin-bottom: 16px;
    }

    .testimonial-text {
      font-size: 14px;
      color: var(--color-text-muted);
      line-height: 1.8;
      margin-bottom: 24px;
    }

    .client-profile {
      display: flex;
      align-items: center;
      gap: 14px;
    }

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

    /* 11. 技术资讯网格 */
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .insight-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .insight-body {
      padding: 24px;
    }

    .insight-meta {
      font-size: 12px;
      color: var(--color-text-light);
      margin-bottom: 8px;
    }

    .insight-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--color-text-main);
      margin-bottom: 12px;
      line-height: 1.4;
    }

    .insight-desc {
      font-size: 13px;
      color: var(--color-text-muted);
      line-height: 1.6;
    }

    /* 12. 多重安全与平台保障 */
    .compliance-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .compliance-badge-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .compliance-icon {
      font-size: 32px;
      margin-bottom: 16px;
    }

    .compliance-badge-card h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .compliance-badge-card p {
      font-size: 13px;
      color: var(--color-text-light);
      line-height: 1.5;
    }

    /* 13. FAQ 常见问题手风琴 */
    .faq-layout {
      display: grid;
      grid-template-columns: 0.8fr 1.2fr;
      gap: 56px;
    }

    .faq-item {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--color-text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-arrow {
      transition: transform 0.3s ease;
      font-size: 14px;
      color: var(--color-primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
      background: #FAFCFF;
      color: var(--color-text-muted);
      font-size: 14px;
      line-height: 1.8;
      border-top: 1px solid transparent;
    }

    .faq-answer-inner {
      padding: 20px 24px;
    }

    .faq-item.active {
      border-color: rgba(15, 82, 186, 0.35);
      box-shadow: 0 4px 16px rgba(15, 82, 186, 0.08);
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }

    .faq-item.active .faq-answer {
      max-height: 280px;
      border-top-color: var(--color-border);
    }

    /* 转化表单区 */
    .contact-card-box {
      background: linear-gradient(135deg, #0F172A, #1E293B);
      border-radius: var(--radius-xl);
      padding: 64px 48px;
      color: #ffffff;
      box-shadow: 0 20px 40px -8px rgba(15, 23, 42, 0.25);
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 56px;
      align-items: center;
    }

    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .form-group input,
    .form-group textarea,
    .form-group select {
      width: 100%;
      background: rgba(255, 255, 255, 0.07);
      border: 1px solid rgba(255, 255, 255, 0.16);
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      color: #ffffff;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }

    .form-group input:focus,
    .form-group textarea:focus,
    .form-group select:focus {
      border-color: #38BDF8;
      background: rgba(255, 255, 255, 0.12);
      box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.2);
    }

    .form-group select option {
      background: #1E293B;
      color: #ffffff;
    }

    /* 页脚系统 */
    .site-footer {
      background-color: #070B13;
      color: #94A3B8;
      padding-top: 80px;
      padding-bottom: 32px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 14px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr repeat(3, 1fr);
      gap: 48px;
      margin-bottom: 64px;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 22px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--color-text-main);
    }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .services-grid,
      .solutions-grid,
      .testimonials-grid,
      .insights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid,
      .milestones-track,
      .compliance-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .dark-case-grid,
      .about-layout,
      .faq-layout,
      .story-container,
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .mobile-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 16px 24px rgba(0, 0, 0, 0.08);
        border-bottom: 1px solid var(--color-border);
      }
      .nav-links.active {
        display: flex;
      }
      .hero-h1 {
        font-size: 32px;
      }
      .services-grid,
      .solutions-grid,
      .testimonials-grid,
      .insights-grid,
      .metrics-grid,
      .milestones-track,
      .compliance-grid,
      .comparison-wrapper {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 26px;
      }
      .contact-card-box {
        padding: 36px 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }