/* roulang page: index */
:root {
            --brand-mint: #0D9488;
            --brand-deep: #0F766E;
            --accent-orange: #F97316;
            --bg-light: #F8FAFC;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --card-radius: 18px;
            --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
            --card-hover-shadow: 0 20px 30px -10px rgba(13, 148, 136, 0.12), 0 10px 15px -5px rgba(15, 23, 42, 0.04);
        }

        body {
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
        }

        .custom-card {
            border-radius: var(--card-radius);
            box-shadow: var(--card-shadow);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .custom-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--card-hover-shadow);
        }

        .dark-card {
            background-color: rgba(30, 41, 59, 0.7);
            border: 1px solid rgba(45, 212, 191, 0.15);
            backdrop-filter: blur(12px);
        }

        .nav-link {
            position: relative;
            transition: color 0.2s ease;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 50%;
            width: 0;
            height: 2px;
            background-color: var(--brand-mint);
            transition: all 0.2s ease;
            transform: translateX(-50%);
        }

        .nav-link:hover::after {
            width: 100%;
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .accordion-item.active .accordion-content {
            max-height: 400px;
        }

        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }