/* roulang page: index */
:root {
      --color-navy: #0F2027;
      --color-deep: #1A365D;
      --color-dark: #0B132B;
      --color-emerald: #059669;
      --color-green: #10B981;
      --color-amber: #D97706;
      --color-surface: #F8FAFC;
      --color-surface-alt: #F1F5F9;
      --color-border: #E2E8F0;
      --color-text-main: #1E293B;
      --color-text-muted: #64748B;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
      --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 12px 32px -4px rgba(15, 23, 42, 0.12);
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      color: var(--color-text-main);
      background-color: #FFFFFF;
      overflow-x: hidden;
      line-height: 1.7;
    }
    .custom-container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .card-border {
      border: 1px solid var(--color-border);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease-in-out;
    }
    .card-border:hover {
      border-color: #CBD5E1;
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }
    .stage-perspective {
      perspective: 1200px;
    }
    .stage-mockup {
      transform: rotateX(5deg) scale(0.98);
      box-shadow: 0 25px 50px -12px rgba(15, 32, 39, 0.25);
      transition: transform 0.4s ease, box-shadow 0.4s ease;
    }
    .stage-mockup:hover {
      transform: rotateX(0deg) scale(1);
      box-shadow: 0 30px 60px -15px rgba(15, 32, 39, 0.35);
    }
    .nav-blur {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
    }
    .badge-soft {
      display: inline-flex;
      align-items: center;
      padding: 0.25rem 0.75rem;
      border-radius: 9999px;
      font-size: 0.8125rem;
      font-weight: 500;
      background-color: #ECFDF5;
      color: #047857;
      border: 1px solid #A7F3D0;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 260px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }