.exportar-apuntes-btn {
            background-color: #0073aa;
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-weight: bold;
            transition: all 0.3s ease;
        }
        
        .exportar-apuntes-btn:hover {
            background-color: #005177;
        }
        
        .exportar-apuntes-btn.loading {
            opacity: 0.7;
            cursor: wait;
        }