/* roulang page: index */
:root {
      --primary: #1A56DB;
      --primary-hover: #1442a8;
      --secondary: #0EA5E9;
      --dark-accent: #0B1528;
      --bg-light: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: rgba(226, 232, 240, 0.85);
      --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.02);
      --card-hover-shadow: 0 20px 30px -10px rgba(26, 86, 219, 0.12), 0 10px 15px -5px rgba(15, 23, 42, 0.04);
      --radius-lg: 16px;
      --radius-md: 10px;
    }

    * {
      box-sizing: border-box;
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

    /* Top Utility Bar */
    .top-utility-bar {
      background-color: #F1F5F9;
      font-size: 0.825rem;
      color: var(--text-muted);
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
      padding: 6px 0;
    }

    /* Main Navbar */
    .main-navbar {
      background-color: #ffffff;
      box-shadow: 0 2px 10px rgba(15, 23, 42, 0.05);
      position: sticky;
      top: 0;
      z-index: 1030;
      padding: 12px 0;
    }
    .navbar-brand {
      font-size: 1.45rem;
      font-weight: 800;
      color: var(--primary) !important;
      display: flex;
      align-items: center;
      gap: 10px;
      letter-spacing: -0.5px;
    }
    .navbar-brand i {
      color: var(--secondary);
    }
    .nav-link {
      font-weight: 600;
      color: #334155 !important;
      padding: 8px 16px !important;
      transition: color 0.2s ease;
    }
    .nav-link:hover {
      color: var(--primary) !important;
    }
    .btn-nav-trial {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: 8px;
      padding: 7px 18px;
      transition: all 0.2s ease;
    }
    .btn-nav-trial:hover {
      background-color: #EFF6FF;
      color: var(--primary-hover);
    }
    .btn-nav-download {
      background-color: var(--primary);
      color: #ffffff !important;
      font-weight: 600;
      border-radius: 8px;
      padding: 8px 20px;
      border: none;
      transition: all 0.2s ease;
    }
    .btn-nav-download:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(26, 86, 219, 0.25);
    }

    /* Custom Cards & Sections */
    .section-wrap {
      padding: 85px 0;
      position: relative;
    }
    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 1rem;
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.05rem;
      max-width: 760px;
      margin: 0 auto 3rem auto;
      line-height: 1.7;
    }
    .app-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      padding: 2rem;
      transition: all 0.28s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .app-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(26, 86, 219, 0.3);
    }
    .icon-badge {
      width: 54px;
      height: 54px;
      border-radius: 12px;
      background: #EFF6FF;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 1.45rem;
      margin-bottom: 1.25rem;
    }

    /* Hero Section (Video Stage & Data Dashboard) */
    .hero-video-stage {
      position: relative;
      background: linear-gradient(135deg, rgba(11, 21, 40, 0.88), rgba(26, 86, 219, 0.78)), url('/assets/images/aaab526037d8af88.jpg') center/cover no-repeat;
      color: #ffffff;
      padding: 110px 0 90px 0;
      min-height: 720px;
      display: flex;
      align-items: center;
    }
    .hero-play-icon {
      width: 76px;
      height: 76px;
      background: rgba(255, 255, 255, 0.18);
      backdrop-filter: blur(8px);
      border: 2px solid rgba(255, 255, 255, 0.6);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.8rem;
      color: #ffffff;
      margin: 0 auto 2rem auto;
      cursor: pointer;
      transition: all 0.3s ease;
    }
    .hero-play-icon:hover {
      transform: scale(1.1);
      background: #ffffff;
      color: var(--primary);
    }
    .hero-kpi-bar {
      margin-top: 3.5rem;
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.18);
      border-radius: var(--radius-lg);
      padding: 1.75rem 2.5rem;
    }
    .hero-kpi-item h4 {
      font-size: 2.2rem;
      font-weight: 800;
      color: #38BDF8;
      margin-bottom: 0.25rem;
    }
    .hero-kpi-item p {
      font-size: 0.9rem;
      margin: 0;
      color: #E2E8F0;
    }

    /* Dark Narrative Section */
    .dark-narrative-section {
      background-color: var(--dark-accent);
      color: #F8FAFC;
    }
    .dark-narrative-section .section-title {
      color: #ffffff;
    }
    .dark-narrative-section .section-subtitle {
      color: #94A3B8;
    }
    .dark-tech-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-lg);
      padding: 2.25rem;
      height: 100%;
    }
    .dark-tech-card h5 {
      color: #38BDF8;
      font-weight: 700;
      margin-bottom: 1rem;
    }

    /* Timeline Stepper */
    .stepper-num {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.25rem;
      box-shadow: 0 4px 10px rgba(26, 86, 219, 0.35);
    }

    /* FAQ Custom */
    .accordion-item {
      border: 1px solid var(--border-color);
      border-radius: 12px !important;
      margin-bottom: 1rem;
      overflow: hidden;
      background: #ffffff;
    }
    .accordion-button {
      font-weight: 700;
      color: var(--text-main);
      padding: 1.25rem 1.5rem;
      box-shadow: none !important;
    }
    .accordion-button:not(.collapsed) {
      background-color: #EFF6FF;
      color: var(--primary);
    }
    .accordion-body {
      color: var(--text-muted);
      line-height: 1.7;
      padding: 1.25rem 1.5rem;
    }

    /* CTA Card */
    .cta-banner-card {
      background: linear-gradient(135deg, #1A56DB 0%, #0284C7 100%);
      border-radius: 24px;
      color: #ffffff;
      padding: 4.5rem 3rem;
      box-shadow: 0 20px 40px -10px rgba(26, 86, 219, 0.4);
    }

    /* Footer */
    footer {
      background-color: #060D1A;
      color: #94A3B8;
      padding: 70px 0 35px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.925rem;
    }
    footer a {
      color: #94A3B8;
      text-decoration: none;
      transition: color 0.2s;
    }
    footer a:hover {
      color: #ffffff;
    }

    @media (max-width: 991.98px) {
      .hero-video-stage {
        padding: 70px 0;
        min-height: auto;
      }
      .section-wrap {
        padding: 60px 0;
      }
      .cta-banner-card {
        padding: 3rem 1.5rem;
      }
    }