/* roulang page: index */
:root {
            --primary: #1e40af;
            --primary-hover: #1d4ed8;
            --accent-cyan: #0ea5e9;
            --accent-amber: #f59e0b;
            --text-heading: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --bg-light: #f8fafc;
            --bg-alt: #f1f5f9;
            --card-border: #e2e8f0;
            --shadow-subtle: 0 10px 25px -5px rgba(15, 23, 42, 0.05);
            --shadow-card: 0 20px 30px -10px rgba(15, 23, 42, 0.08);
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            color: var(--text-body);
            background-color: #ffffff;
            overflow-x: hidden;
        }
        .custom-card {
            border: 1px solid var(--card-border);
            box-shadow: var(--shadow-subtle);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .custom-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
            border-color: #cbd5e1;
        }
        .hero-slide {
            transition: opacity 0.8s ease-in-out;
        }
        .faq-content {
            transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            opacity: 0;
            overflow: hidden;
        }
        .faq-item.active .faq-content {
            max-height: 400px;
            opacity: 1;
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }