/* roulang page: index */
:root {
      --deep-blue: #0A1128;
      --dark-purple: #1A1F3A;
      --electric-blue: #3B82F6;
      --teal-bright: #06D6A0;
      --glass-bg: rgba(15, 23, 50, 0.6);
      --glass-border: rgba(59, 130, 246, 0.2);
      --text-primary: #F8FAFC;
      --text-secondary: #CBD5E1;
      --text-muted: #94A3B8;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-glow: 0 0 20px rgba(59,130,246,0.6);
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'Noto Sans SC', sans-serif;
      background: linear-gradient(135deg, #0A1128 0%, #1A1F3A 100%);
      color: #F8FAFC;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    .glass-card {
      background: rgba(15, 23, 50, 0.6);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(59, 130, 246, 0.2);
      border-radius: 16px;
      box-shadow: 0 8px 32px rgba(0,0,0,0.4);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: rgba(6, 214, 160, 0.5);
      box-shadow: 0 12px 36px rgba(0,0,0,0.6);
    }
    .btn-primary {
      background-color: #3B82F6;
      color: white;
      font-weight: 600;
      border-radius: 8px;
      padding: 0.75rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s;
      border: none;
      cursor: pointer;
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background-color: #2563EB;
      box-shadow: 0 0 20px rgba(59,130,246,0.7);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.3);
      color: white;
      font-weight: 500;
      border-radius: 8px;
      padding: 0.75rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-outline:hover {
      border-color: #06D6A0;
      color: #06D6A0;
      box-shadow: 0 0 12px rgba(6,214,160,0.4);
      transform: translateY(-2px);
    }
    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      margin-bottom: 1rem;
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 2rem;
      }
    }
    .pulse-arrow {
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { transform: translateY(0); opacity: 0.7; }
      50% { transform: translateY(8px); opacity: 1; }
      100% { transform: translateY(0); opacity: 0.7; }
    }
    .fade-in {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-in.visible {
      opacity: 1;
      transform: translateY(0);
    }
    .nav-blur {
      background: rgba(10, 17, 40, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
    }
    .active-tab {
      border-bottom: 2px solid #3B82F6;
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-top: 0.75rem;
    }
    .scenario-card:hover {
      border-color: #06D6A0;
      box-shadow: 0 16px 40px rgba(0,0,0,0.7);
    }

@keyframes marquee { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }