/* roulang page: index */
:root {
            --primary: #4F46E5;
            --primary-gradient: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
            --surface-bg: #F8FAFC;
            --card-border: #E2E8F0;
            --text-dark: #0F172A;
            --text-muted: #64748B;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            background-color: var(--surface-bg);
            color: #334155;
            line-height: 1.6;
        }
        .gradient-text {
            background: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .btn-gradient {
            background: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
            transition: all 0.3s ease;
        }
        .btn-gradient:hover {
            opacity: 0.95;
            box-shadow: 0 10px 25px -5px rgba(79, 70, 229, 0.4);
            transform: translateY(-1px);
        }
        .glass-header {
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(12px);
        }
        .glass-panel {
            background: rgba(15, 23, 42, 0.75);
            backdrop-filter: blur(16px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .card-custom {
            transition: all 0.28s ease;
            box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 30px -4px rgba(79, 70, 229, 0.12), 0 4px 10px -2px rgba(15, 23, 42, 0.04);
            border-color: #CBD5E1;
        }
        details summary::-webkit-details-marker {
            display: none;
        }