/* roulang page: index */
:root {
            --primary: #1E3A8A;
            --secondary: #2563EB;
            --darkslate: #0F172A;
            --accent: #B45309;
            --bg-light: #F8FAFC;
            --text-main: #334155;
            --text-dark: #0F172A;
            --text-muted: #64748B;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
            letter-spacing: -0.01em;
            line-height: 1.75;
            color: var(--text-main);
            background-color: var(--bg-light);
        }
        h1, h2, h3, h4, h5, h6 {
            color: var(--text-dark);
            line-height: 1.35;
        }
        .card-shadow {
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
            transition: all 0.25s ease-in-out;
        }
        .card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(30, 58, 138, 0.08), 0 8px 10px -6px rgba(30, 58, 138, 0.06);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }
        .accordion-open .accordion-content {
            max-height: 250px;
        }
        .accordion-open .accordion-arrow {
            transform: rotate(180deg);
        }