I think you could do this by adding the merge tag for this ‘yes’ field, as a CSS class to a div or span, and then adding the appropriate styles via the theme customizer. Something like this:
On fire? <span class="{Is your house on fire?:17:value}">{Is your house on fire?:17}</span>
And then your class is either “yes” or “no” and you add the styles via the customizer like this:
Yes, I went about it using the css data-attribute and your approach does about the same except it places it in the css rule. So I’ll make some classes “.house_on_fire_yes{ color:red;}” and “.house_on_fire_no{color: blue;}” and then place the merge field in the html markup
{house on fire:1}
.
That does it. Now I can style the responses based on the response!