/* roulang page: index */
:root {
            --primary: #0A192F;
            --brand-gradient: linear-gradient(135deg, #0284C7 0%, #2563EB 60%, #4F46E5 100%);
            --cleanroom-bg: #F8FAFC;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--cleanroom-bg);
            color: #1E293B;
            overflow-x: hidden;
        }
        .bg-brand-linear {
            background-image: var(--brand-gradient);
        }
        .text-brand-gradient {
            background: var(--brand-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .card-trans {
            transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .card-trans:hover {
            transform: translateY(-5px);
            box-shadow: 0 25px 45px -12px rgba(2, 132, 199, 0.16);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-active .accordion-content {
            max-height: 250px;
        }
        .accordion-active .accordion-icon {
            transform: rotate(45deg);
        }