Card Mod - Style Secondary Info Text

Configuration Frontend
1

So I managed to install card mod and style the main text and overall font weight for an individual card:

  card_mod:
    style: |
      ha-card {
        color: red;
        font-weight: 800;
      }

But how can I change the color of the secondary_info element? And if I use font-weight it changes the overall font weight … what if I only want the secondary_info in bold?

  card_mod:
    style: |
      ha-card {
        color: red;
        font-weight: 800;   #CHANGES OVERALL :(
        secondary-text-color: blue;    #DOES NOT WORK
      }