/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-hover: #0a3d8f;
      --accent: #00A86B;
      --accent-hover: #008f5a;
      --bg-canvas: #F8FAFC;
      --bg-surface: #FFFFFF;
      --bg-midnight: #0A192F;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-sub: #64748B;
      --border-color: #E2E8F0;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05), 0 1px 2px rgba(15, 23, 42, 0.03);
      --shadow-md: 0 10px 25px -5px rgba(15, 82, 186, 0.08), 0 8px 10px -6px rgba(15, 82, 186, 0.04);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 14px;
      --sidebar-width: 250px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-canvas);
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    /* Layout System */
    .app-shell {
      display: flex;
      min-height: 100vh;
      position: relative;
    }

    /* Sidebar Navigation */
    .sidebar-nav {
      width: var(--sidebar-width);
      background-color: #ffffff;
      border-right: 1px solid var(--border-color);
      height: 100vh;
      position: fixed;
      left: 0;
      top: 0;
      z-index: 100;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 24px 16px;
    }

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 8px 12px 24px;
      border-bottom: 1px solid var(--border-color);
    }

    .brand-icon {
      width: 40px;
      height: 40px;
      border-radius: var(--radius-sm);
      background: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 20px;
    }

    .brand-name {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      text-decoration: none;
    }

    .nav-menu {
      list-style: none;
      margin: 20px 0 0 0;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .nav-item a {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 10px 14px;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      transition: all 0.2s ease;
    }

    .nav-item a:hover,
    .nav-item a.active {
      color: var(--primary);
      background-color: rgba(15, 82, 186, 0.08);
      transform: translateX(3px);
    }

    .sidebar-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }

    .network-badge {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.8rem;
      color: var(--text-sub);
      background: #F1F5F9;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }

    .status-pulse {
      width: 8px;
      height: 8px;
      background-color: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 0 2px rgba(0, 168, 107, 0.3);
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(0, 168, 107, 0.5); }
      70% { box-shadow: 0 0 0 6px rgba(0, 168, 107, 0); }
      100% { box-shadow: 0 0 0 0 rgba(0, 168, 107, 0); }
    }

    /* Content Area */
    .content-area {
      margin-left: var(--sidebar-width);
      width: calc(100% - var(--sidebar-width));
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    /* Mobile Header */
    .mobile-topbar {
      display: none;
      height: 60px;
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 99;
      padding: 0 16px;
      align-items: center;
      justify-content: space-between;
    }

    .mobile-menu-toggle {
      background: transparent;
      border: none;
      font-size: 1.25rem;
      color: var(--text-main);
      cursor: pointer;
    }

    .mobile-nav-panel {
      display: none;
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
      padding: 12px 16px;
    }

    .mobile-nav-panel.open {
      display: block;
    }

    .mobile-nav-panel a {
      display: block;
      padding: 8px 0;
      color: var(--text-main);
      text-decoration: none;
      font-size: 0.95rem;
    }

    /* General Typography & Sections */
    section {
      padding: 4.5rem 2rem;
      position: relative;
    }

    .section-wrap {
      max-width: 1180px;
      margin: 0 auto;
    }

    .section-head {
      margin-bottom: 2.5rem;
    }

    .section-head.center {
      text-align: center;
    }

    .section-title {
      font-size: 1.85rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 0.75rem;
      letter-spacing: -0.3px;
    }

    .section-desc {
      color: var(--text-sub);
      font-size: 1.05rem;
      max-width: 780px;
      line-height: 1.8;
    }

    .section-head.center .section-desc {
      margin: 0 auto;
    }

    /* UI Components */
    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background-color: var(--primary);
      color: #ffffff;
      padding: 12px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.2s ease;
      border: 1px solid var(--primary);
      cursor: pointer;
    }

    .btn-main:hover {
      background-color: var(--primary-hover);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(15, 82, 186, 0.25);
      transform: translateY(-2px);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background-color: transparent;
      color: var(--primary);
      padding: 12px 26px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.2s ease;
      border: 1px solid var(--border-color);
      cursor: pointer;
    }

    .btn-outline:hover {
      background-color: #F1F5F9;
      border-color: var(--primary);
      color: var(--primary);
    }

    .tag-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--primary);
      background: rgba(15, 82, 186, 0.1);
      padding: 4px 10px;
      border-radius: 4px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .card-box {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .card-box:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
      border-color: rgba(15, 82, 186, 0.3);
    }

    /* Section 1: Hero */
    #hero {
      background: linear-gradient(135deg, rgba(10, 25, 47, 0.95), rgba(15, 23, 42, 0.92)), url('/assets/images/7ca264602058a58b.jpg') center/cover no-repeat;
      color: #ffffff;
      padding: 5rem 2rem;
    }

    .hero-container {
      max-width: 1180px;
      margin: 0 auto;
    }

    .hero-h1 {
      font-size: 2.5rem;
      font-weight: 800;
      color: #ffffff;
      line-height: 1.35;
      margin-bottom: 1.25rem;
    }

    .hero-intro {
      font-size: 1.05rem;
      color: #CBD5E1;
      line-height: 1.85;
      margin-bottom: 2rem;
      max-width: 600px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 2rem;
    }

    .faux-panel {
      background: rgba(15, 23, 42, 0.75);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-md);
      padding: 20px;
    }

    .faux-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 14px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9rem;
    }

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

    /* Section 2: Features */
    #features {
      background-color: var(--bg-surface);
    }

    /* Section 3: Architecture */
    #architecture {
      background-color: var(--bg-canvas);
    }

    .tech-metric-box {
      background: #F1F5F9;
      border-left: 4px solid var(--accent);
      padding: 16px 20px;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
      margin-top: 1.5rem;
    }

    /* Section 4: Strengths (6-Grid) */
    #strengths {
      background-color: var(--bg-surface);
    }

    /* Section 5: Solutions */
    #solutions {
      background-color: var(--bg-canvas);
    }

    /* Section 6: Showcase (Dark) */
    #showcase {
      background-color: var(--bg-midnight);
      color: #ffffff;
    }

    #showcase .section-title {
      color: #ffffff;
    }

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

    .showcase-board {
      background: #0F172A;
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 24px;
    }

    /* Section 7: Stories */
    #stories {
      background-color: var(--bg-surface);
    }

    /* Section 8: Metrics */
    #metrics {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 3rem 2rem;
    }

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

    .metric-number {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
      line-height: 1.2;
    }

    .metric-label {
      color: var(--text-muted);
      font-size: 0.9rem;
      font-weight: 500;
    }

    /* Section 9: Comparison */
    #comparison {
      background-color: var(--bg-canvas);
    }

    .compare-table-wrap {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow-x: auto;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      margin: 0;
      text-align: left;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background-color: #F8FAFC;
      color: var(--text-main);
      font-weight: 600;
    }

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

    /* Section 10: News */
    #news {
      background-color: var(--bg-surface);
    }

    /* Section 11: FAQ */
    #faq {
      background-color: var(--bg-canvas);
    }

    .accordion-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .accordion-trigger {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: #ffffff;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
    }

    .accordion-content {
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.8;
      display: none;
    }

    .accordion-item.active .accordion-content {
      display: block;
    }

    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }

    /* Section 12: CTA & Assurance */
    #cta {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
    }

    .cta-card {
      background: linear-gradient(135deg, rgba(15, 82, 186, 0.04), rgba(0, 168, 107, 0.04));
      border: 1px solid rgba(15, 82, 186, 0.15);
      border-radius: var(--radius-lg);
      padding: 40px;
      text-align: center;
    }

    .cta-input-group {
      max-width: 520px;
      margin: 24px auto 0;
      display: flex;
      gap: 8px;
    }

    .cta-input {
      flex: 1;
      height: 48px;
      padding: 0 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
    }

    .cta-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.15);
    }

    /* Footer */
    .site-footer {
      background-color: var(--bg-midnight);
      color: #94A3B8;
      padding: 3rem 2rem 2rem;
      font-size: 0.9rem;
    }

    .footer-inner {
      max-width: 1180px;
      margin: 0 auto;
    }

    .footer-top {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 30px;
      padding-bottom: 2rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .footer-brand {
      font-size: 1.25rem;
      color: #ffffff;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .footer-links a {
      color: #94A3B8;
      text-decoration: none;
      margin-right: 20px;
    }

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

    .footer-bottom {
      padding-top: 2rem;
      text-align: center;
      font-size: 0.85rem;
      color: #64748B;
    }

    /* Responsive */
    @media (max-width: 1023px) {
      .sidebar-nav {
        display: none;
      }
      .content-area {
        margin-left: 0;
        width: 100%;
      }
      .mobile-topbar {
        display: flex;
      }
      .hero-h1 {
        font-size: 2rem;
      }
      .cta-input-group {
        flex-direction: column;
      }
    }