/* roulang page: index */
:root {
            --primary-blue: #0066FF;
            --primary-cyan: #00D2FF;
            --brand-dark: #0B1B3D;
            --brand-night: #080F1E;
            --brand-surface: #F8FAFC;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            color: #334155;
            background-color: var(--brand-surface);
            line-height: 1.6;
        }
        .text-gradient {
            background: linear-gradient(135deg, #0066FF 0%, #00D2FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .btn-gradient {
            background: linear-gradient(135deg, #0066FF 0%, #00C5FF 100%);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .btn-gradient:hover {
            box-shadow: 0 10px 25px -5px rgba(0, 102, 255, 0.4);
            transform: translateY(-2px);
        }
        .card-custom {
            border-radius: 20px;
            background: #ffffff;
            border: 1px solid rgba(226, 232, 240, 0.8);
            box-shadow: 0 10px 30px -5px rgba(0, 102, 255, 0.05), 0 4px 6px -2px rgba(15, 23, 42, 0.03);
            transition: all 0.3s ease;
        }
        .card-custom:hover {
            border-color: rgba(0, 210, 255, 0.5);
            transform: translateY(-4px);
            box-shadow: 0 20px 35px -5px rgba(0, 102, 255, 0.1);
        }
        .dark-card-custom {
            border-radius: 20px;
            background: rgba(15, 23, 42, 0.7);
            border: 1px solid rgba(0, 210, 255, 0.2);
            transition: all 0.3s ease;
        }
        .dark-card-custom:hover {
            border-color: rgba(0, 210, 255, 0.6);
            box-shadow: 0 10px 30px -5px rgba(0, 210, 255, 0.15);
        }
        .badge-pill {
            border-radius: 9999px;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.875rem;
            font-weight: 500;
        }
        .accordion-content {
            transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), opacity 0.3s ease;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .accordion-item.active .accordion-content {
            max-height: 500px;
            opacity: 1;
            transition: max-height 0.4s ease-in-out, opacity 0.4s ease;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }