/* roulang page: index */
:root {
            --primary: #1d4ed8;
            --accent: #0284c7;
            --success: #059669;
            --surface-bg: #f8fafc;
            --text-dark: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --card-border: #e2e8f0;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-soft: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 16px 32px -4px rgba(29, 78, 216, 0.12);
        }
        * {
            box-sizing: border-box;
            scroll-behavior: smooth;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--text-body);
            background-color: var(--surface-bg);
            margin: 0;
            padding: 0;
            overflow-x: hidden;
        }
        .card-custom {
            background-color: #ffffff;
            border: 1px solid var(--card-border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-soft);
            transition: all 0.25s ease;
        }
        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: #bfdbfe;
        }
        details summary::-webkit-details-marker {
            display: none;
        }
        .section-separator {
            border-top: 1px solid #e2e8f0;
        }