/* roulang page: index */
:root {
            --brand-primary: #00B074;
            --brand-dark: #0F172A;
            --brand-accent: #F97316;
            --bg-light: #F8FAFC;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.75;
            color: #334155;
            background-color: var(--bg-light);
        }
        .scroll-mt-header {
            scroll-margin-top: 100px;
        }
        .hero-bg-overlay {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(15, 23, 42, 0.85) 100%), url('/assets/images/7a6a030ebf6eef38.png') center/cover no-repeat;
        }
        .dark-section-bg {
            background: linear-gradient(180deg, #0F172A 0%, #1E293B 100%);
        }
        .card-custom {
            transition: all 0.25s ease-in-out;
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 30px -10px rgba(0, 0, 0, 0.08);
        }
        .accordion-content {
            transition: max-height 0.3s ease-out;
            max-height: 0;
            overflow: hidden;
        }
        .accordion-item.active .accordion-content {
            max-height: 250px;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }