/* roulang page: index */
:root {
            --primary-brand: #0F5B66;
            --primary-dark: #083344;
            --accent-green: #10B981;
            --neutral-bg: #FAFAFC;
            --section-alt: #F3F4F8;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-line: #E2E8F0;
        }

        body {
            background-color: var(--neutral-bg);
            color: var(--text-body);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        .card-shadow {
            box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px -4px rgba(15, 91, 102, 0.12);
        }

        .soundwave-bar {
            animation: soundWave 1.4s ease-in-out infinite alternate;
        }
        @keyframes soundWave {
            0% { height: 6px; }
            100% { height: 26px; }
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-item.active .accordion-content {
            max-height: 280px;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }