:root {
            --brand-primary: #1e3a8a;
            --brand-secondary: #0d9488;
            --brand-accent: #3b82f6;
            --bg-light: #f8fafc;
            --card-border: #e2e8f0;
        }

        body {
            background-color: var(--bg-light);
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            color: #334155;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .navbar-custom {
            background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
        }

        .hero-banner {
            background: linear-gradient(rgba(15, 23, 42, 0.85), rgba(30, 58, 138, 0.85)), 
                        url('https://images.unsplash.com/photo-1508873696983-2df515122519?auto=format&fit=crop&w=1600&q=80') center/cover;
            color: white;
            padding: 2.5rem 0;
            border-bottom: 4px solid var(--brand-secondary);
        }

        .card-custom {
            border: 1px solid var(--card-border);
            border-radius: 0.75rem;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            background: #ffffff;
            margin-bottom: 1.5rem;
        }

        .card-header-custom {
            background-color: #ffffff;
            border-bottom: 2px solid #f1f5f9;
            padding: 1rem 1.25rem;
            font-weight: 700;
            color: var(--brand-primary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
            border-radius: 0.75rem 0.75rem 0 0 !important;
        }

        .btn-brand {
            background-color: var(--brand-primary);
            color: #ffffff;
            font-weight: 600;
            transition: all 0.2s ease;
        }

        .btn-brand:hover {
            background-color: #1e40af;
            color: #ffffff;
            transform: translateY(-1px);
        }

        .btn-teal {
            background-color: var(--brand-secondary);
            color: #ffffff;
            font-weight: 600;
        }

        .btn-teal:hover {
            background-color: #0f766e;
            color: #ffffff;
        }

        /* Tabla de Monografías */
        .table-responsive {
            border-radius: 0.5rem;
        }

        table.dataTable standard {
            font-size: 0.9rem;
        }

        table.dataTable thead th {
            background-color: #f1f5f9 !important;
            color: #1e293b;
            font-weight: 600;
            border-bottom: 2px solid #cbd5e1 !important;
        }

        .badge-estado {
            font-size: 0.75rem;
            padding: 0.35em 0.65em;
            border-radius: 0.375rem;
        }

        /* Anuncios & Descargas Sidebar Cards */
        .news-item {
            border-left: 3px solid var(--brand-secondary);
            padding-left: 0.85rem;
            margin-bottom: 1rem;
        }

        .news-date {
            font-size: 0.75rem;
            color: #64748b;
        }

        .download-btn-group .btn {
            display: flex;
            align-items: center;
            justify-content: space-between;
            text-align: left;
            margin-bottom: 0.6rem;
            border: 1px solid #e2e8f0;
            background: #f8fafc;
            color: #334155;
            transition: all 0.2s;
        }

        .download-btn-group .btn:hover {
            background: #edf2f7;
            border-color: #cbd5e1;
            transform: translateX(3px);
        }

        .img-modal-preview {
            max-width: 100%;
            max-height: 70vh;
            object-fit: contain;
            border-radius: 0.5rem;
        }

        footer {
            margin-top: auto;
            background: #0f172a;
            color: #94a3b8;
            font-size: 0.875rem;
        }

        /* Badge DB Status Indicator */
        .db-status-badge {
            font-size: 0.75rem;
            padding: 0.25rem 0.5rem;
            border-radius: 1rem;
        }