Change text color based on severity "Big Number Card"

It can’t be that complicated but I am getting tangled up and loosing my way! I have a simple Big Number Card showing inside temperature. All I want to achieve is that if the temp is 0°c or below the text color should be “Red” above 0°c it should be “Dark Blue”
this is the yaml file:

      - type: custom:bignumber-card
        title: Ute temp
        entity: sensor.extra_temperature_temperature
        scale: 70px
        round: 1
        min: -50
        max: 100
        severity:
          - value: -50
            style: var(--primary-text-color-red)
          - value: 1
            style: var(--primary-text-color-DarkBlue)
        bnStyle: |
          bnStyle: var(--label-background-color-#E0FFFF)
          bnStyle: var(--label-boarder-width-0)
          background-color: '#E0FFFF'
        card_mod:
          bnStyle:
            boarder-width: '0'
            background-color: '#E0FFFF'

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