/* roulang page: index */
:root {
      --primary-blue: #1E40AF;
      --accent-blue: #3B82F6;
      --teal-green: #0D9488;
      --amber-gold: #F59E0B;
      --bg-slate: #F8FAFC;
      --dark-navy: #0F172A;
      --text-main: #0F172A;
      --text-sub: #475569;
      --border-color: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-slate);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .hero-gradient-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 64, 175, 0.85) 60%, rgba(13, 148, 136, 0.75) 100%);
    }
    .custom-card-border {
      border: 1px solid transparent;
      background-image: linear-gradient(white, white), linear-gradient(135deg, rgba(59, 130, 246, 0.25), rgba(13, 148, 136, 0.15));
      background-origin: border-box;
      background-clip: padding-box, border-box;
    }
    .hover-card-elevation {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .hover-card-elevation:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }
    .accordion-content.open {
      max-height: 250px;
    }