/* roulang page: index */
:root {
            --primary: #1E40AF;
            --accent: #2563EB;
            --bg-page: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --card-border: #E2E8F0;
            --card-shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -2px rgba(15, 23, 42, 0.05);
            --card-shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.08);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }
        body { background-color: var(--bg-page); color: var(--text-main); line-height: 1.6; }
        .hero-pattern {
            background-color: #0F172A;
            background-image: linear-gradient(rgba(15, 23, 42, 0.88), rgba(15, 23, 42, 0.94)), url('/assets/images/a4bea3820d8e7b95.webp');
            background-size: cover;
            background-position: center;
        }
        .section-separator { border-bottom: 1px solid var(--card-border); }
        .card-hover {
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-hover:hover {
            transform: translateY(-3px);
            box-shadow: var(--card-shadow-hover);
        }
        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }