post-radio-button-css-counter.css

::root{
  counter-reset: selectedRadioCount, unSelectedRadioCount;
}
label+input[type='radio']{
  counter-increment: unSelectedRadioCount;
}
label+input[type='radio']:checked{
  counter-increment: selectedRadioCount;
}
input[type="radio"]:not(label+input[type='radio']):checked{
  counter-increment: unSelectedRadioCount -1 selectedRadioCount;
}
#unSelectedRadioCount::after{
  content: counter(unSelectedRadioCount)
}
#selectedRadioCount::after{
  content: counter(selectedRadioCount)
}