labeling - Split label style in GeoServer CSS or SLD

I would like to split the style of my labels, which consist of 2 attributes. I already managed to separate the lines, but I need to style them differently as well, as the second line should be bold.

Currently my map looks like this:

And I would like it to look like this:

I would prefer to do it in CSS, but I also prepared the style in SLD, so I would be happy for a solution in either of them.

My code looks like this in CSS:

* {
    label: [IDENT][LOWERLIMIT];
    -gt-label-auto-wrap: 1;
    font-weight: normal;

    font-fill: black;
}

and like this in SLD:

  
     
       IDENT]]>
       LOWERLIMIT

      
      
       black
       normal
      
  

Answer

Here is a solution in SLD but I think you should be able to generate the same in CSS.

The trick is to use 2 TextSymbolizers and offset them so that they don't overlap.

     
        
          STATE_ABBR
        
        

          Arial
          Normal
          10

        
        
          
            
              0.5
              1.0
            
            
              
                0

              
              
                10
              
            
          
        
      
      
        

          MALE
        
        

          Arial Bold
          Normal
          bold
          10
        
        

          
            
              0.5
              0.0
            
            
              
                0
              
              

                -10
              
            
          
        
      

Depending on your font and polygon sizes you can play with the AnchorPoints and Displacements to adjust the exact placement of the labels.