/* roulang page: index */
:root {
      --pitch-dark: #0A1E17;
      --pitch-black: #0D1117;
      --neon-green: #10B981;
      --neon-bright: #00F59B;
      --surface-white: #FFFFFF;
      --surface-light: #F8FAFC;
      --surface-muted: #F1F5F9;
      --border-color: #E2E8F0;
      --border-dark: rgba(255, 255, 255, 0.12);
      --text-main: #0F172A;
      --text-muted: #64748B;
      --text-light: #94A3B8;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 8px 24px -4px rgba(15, 23, 42, 0.06);
      --shadow-lg: 0 16px 36px -6px rgba(10, 30, 23, 0.12);
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    
    *, *::before, *::after {
      box-sizing: border-box;
    }
    
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--surface-white);
      line-height: 1.75;
      overflow-x: hidden;
      scroll-behavior: smooth;
    }
    
    /* Top Bar & Header */
    .top-info-bar {
      background-color: #071510;
      color: #94A3B8;
      font-size: 0.8125rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 0.45rem 0;
    }
    
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1020;
      background: rgba(10, 30, 23, 0.88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-dark);
      transition: var(--transition);
    }
    .site-header.scrolled {
      background: rgba(8, 22, 17, 0.98);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
    }
    
    .brand-logo {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      color: #FFFFFF;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
    }
    .brand-logo-mark {
      width: 28px;
      height: 28px;
      background: var(--neon-green);
      color: var(--pitch-dark);
      border-radius: 6px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.9rem;
      font-weight: 900;
    }
    
    .nav-link {
      color: #E2E8F0 !important;
      font-size: 0.9375rem;
      font-weight: 500;
      padding: 0.5rem 0.85rem !important;
      transition: var(--transition);
    }
    .nav-link:hover, .nav-link.active {
      color: var(--neon-bright) !important;
    }
    
    /* Buttons */
    .btn-tactical {
      background-color: var(--neon-green);
      color: #042417;
      font-weight: 700;
      font-size: 0.9375rem;
      padding: 0.65rem 1.4rem;
      border-radius: var(--radius-sm);
      border: 1px solid var(--neon-green);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      text-decoration: none;
    }
    .btn-tactical:hover {
      background-color: var(--neon-bright);
      color: #042417;
      border-color: var(--neon-bright);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(16, 185, 129, 0.28);
    }
    
    .btn-tactical-outline {
      background-color: transparent;
      color: #FFFFFF;
      font-weight: 600;
      font-size: 0.9375rem;
      padding: 0.65rem 1.4rem;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.25);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
      text-decoration: none;
    }
    .btn-tactical-outline:hover {
      background-color: rgba(255, 255, 255, 0.1);
      color: var(--neon-bright);
      border-color: var(--neon-bright);
    }
    
    /* Sections */
    section {
      padding: 4.75rem 0;
      position: relative;
    }
    .section-sm {
      padding: 3rem 0;
    }
    .bg-dark-pitch {
      background-color: var(--pitch-dark);
      color: #F8FAFC;
    }
    .bg-dark-black {
      background-color: var(--pitch-black);
      color: #F8FAFC;
    }
    .bg-light-pitch {
      background-color: var(--surface-light);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    
    .section-header {
      margin-bottom: 2.75rem;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      color: var(--neon-green);
      background: rgba(16, 185, 129, 0.1);
      padding: 0.25rem 0.75rem;
      border-radius: 99px;
      margin-bottom: 0.75rem;
      border: 1px solid rgba(16, 185, 129, 0.2);
    }
    .section-title {
      font-size: 2.125rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.25;
      margin-bottom: 0.85rem;
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 1.05rem;
      max-width: 680px;
    }
    .bg-dark-pitch .section-desc, .bg-dark-black .section-desc {
      color: var(--text-light);
    }

    /* Cards */
    .app-card {
      background: var(--surface-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 1.75rem;
      height: 100%;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .app-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #CBD5E1;
    }
    .app-card-dark {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border-dark);
      color: #F8FAFC;
    }
    .app-card-dark:hover {
      border-color: var(--neon-green);
      background: rgba(255, 255, 255, 0.05);
      box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
    }
    
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 1.35rem;
      margin-bottom: 1.2rem;
    }
    .card-icon-danger {
      background: #FEF2F2;
      color: #DC2626;
      border: 1px solid #FEE2E2;
    }
    .card-icon-brand {
      background: rgba(16, 185, 129, 0.12);
      color: var(--neon-green);
      border: 1px solid rgba(16, 185, 129, 0.25);
    }

    /* Hero Banner: Compact Full-width */
    .hero-banner {
      background: linear-gradient(135deg, #071510 0%, #0D261F 60%, #0F172A 100%), url('/assets/images/e525f02d1e6a7567.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      color: #FFFFFF;
      padding: 3.75rem 0 3.25rem 0;
      border-bottom: 1px solid var(--border-dark);
    }
    .hero-banner h1 {
      font-size: 2.65rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 1rem;
    }
    .hero-lead {
      font-size: 1.05rem;
      line-height: 1.8;
      color: #CBD5E1;
      max-width: 720px;
      margin-bottom: 1.75rem;
    }

    /* Steps Timeline */
    .step-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 38px;
      height: 38px;
      background: var(--neon-green);
      color: var(--pitch-dark);
      font-weight: 800;
      border-radius: 50%;
      font-size: 1.05rem;
      margin-bottom: 1rem;
    }

    /* Metric Bar */
    .metric-value {
      font-size: 2.75rem;
      font-weight: 900;
      letter-spacing: -0.03em;
      line-height: 1;
      color: var(--neon-bright);
      margin-bottom: 0.5rem;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }
    .metric-label {
      font-size: 0.9375rem;
      color: #CBD5E1;
      font-weight: 500;
    }

    /* UI Dashboard Frame */
    .dashboard-preview-window {
      background: #0B1218;
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-md);
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
      overflow: hidden;
    }
    .window-header {
      background: #111A22;
      padding: 0.75rem 1.25rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .window-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #475569;
    }

    /* Accordion FAQ */
    .accordion-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm) !important;
      margin-bottom: 0.75rem;
      overflow: hidden;
    }
    .accordion-button {
      font-weight: 700;
      font-size: 1rem;
      padding: 1.1rem 1.35rem;
      color: var(--text-main);
      background-color: var(--surface-white);
    }
    .accordion-button:not(.collapsed) {
      color: var(--pitch-dark);
      background-color: #ECFDF5;
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--neon-green);
      box-shadow: none;
    }
    .accordion-body {
      color: var(--text-muted);
      line-height: 1.75;
      font-size: 0.9375rem;
      padding: 1rem 1.35rem 1.35rem 1.35rem;
      background-color: var(--surface-white);
    }

    /* Form Controls */
    .form-control, .form-select {
      height: 48px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      padding: 0.65rem 1rem;
      font-size: 0.95rem;
    }
    .form-control:focus, .form-select:focus {
      border-color: var(--neon-green);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }

    /* Tag Cloud */
    .tag-bubble {
      display: inline-block;
      padding: 0.4rem 0.85rem;
      background: var(--surface-muted);
      border: 1px solid var(--border-color);
      border-radius: 99px;
      color: var(--text-main);
      font-size: 0.875rem;
      font-weight: 500;
      text-decoration: none;
      transition: var(--transition);
      margin: 0.25rem;
    }
    .tag-bubble:hover {
      background: #ECFDF5;
      color: #065F46;
      border-color: var(--neon-green);
    }

    /* Footer */
    .site-footer {
      background-color: #050B08;
      color: #94A3B8;
      padding: 4.5rem 0 2rem 0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.875rem;
    }
    .site-footer h6 {
      color: #FFFFFF;
      font-weight: 700;
      margin-bottom: 1.25rem;
      font-size: 0.975rem;
    }
    .site-footer a {
      color: #94A3B8;
      text-decoration: none;
      transition: var(--transition);
    }
    .site-footer a:hover {
      color: var(--neon-bright);
    }
    .footer-divider {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      margin: 2.5rem 0 1.5rem 0;
    }

    @media (max-width: 991.98px) {
      .hero-banner h1 {
        font-size: 2.1rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
      section {
        padding: 3.5rem 0;
      }
    }