Conditional Visibility. Help

I have an interaction I am trying to build where the form I’ve created is conditionally affected by an input of a number (if this then that type command). The customer puts in the weight of their pet and they are given correct prices. I’ve seen it done before, but I can’t figure out how to make it happen. Below is a screenshot of the work so far:

I’ve created a CMS collection for the prices, but I can’t figure out how to set a conditional visibility to respond to an input.

Any help is appreciated!

Here is my public share link: [(Services - Luna Veterinary Care)]
(how to access public share link)

Hi. Solution only by custom js code. The core condition visibility not related to form inputs…

The idea ±: