Make font-weight and color responsive

[randalmaia]

Is your feature request related to a problem? Please describe.

I'am frustrated when a try to change the font-weight and color between the breaktpoints

Describe the solution you'd like
Make color and font-weight attributes responsive like any others attributes.

[blvdmitry]

Hey @randalmaia, do you also have some screenshot of what you're building so we can better understand the use case and see if we need to support any other related functionality?