/* roulang page: index */
:root {
            --brand-primary: #2563EB;
            --brand-cyan: #06B6D4;
            --brand-slate: #0F172A;
            --brand-bg: #F8FAFC;
            --card-radius: 16px;
        }
        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
        }
        body {
            background-color: var(--brand-bg);
            color: #334155;
            line-height: 1.75;
            overflow-x: hidden;
        }
        .text-gradient {
            background: linear-gradient(135deg, #2563EB 0%, #06B6D4 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-pattern {
            background-image: linear-gradient(rgba(15, 23, 42, 0.88), rgba(15, 23, 42, 0.94)), url('/assets/images/631f7a27392b6b5f.webp');
            background-size: cover;
            background-position: center;
        }
        .card-custom {
            border-radius: var(--card-radius);
            box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05);
            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s ease, border-color 0.3s ease;
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 30px -10px rgba(37, 99, 235, 0.12);
        }
        .custom-scrollbar::-webkit-scrollbar {
            height: 6px;
        }
        .custom-scrollbar::-webkit-scrollbar-thumb {
            background: #CBD5E1;
            border-radius: 9999px;
        }
        .accordion-content {
            transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .accordion-item.active .accordion-content {
            max-height: 250px;
            opacity: 1;
        }
        .accordion-item.active .chevron-icon {
            transform: rotate(180deg);
        }
        #floating-cta {
            transform: translateY(150%);
            transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
        }
        #floating-cta.visible {
            transform: translateY(0);
        }