Shopify Custom Image Swatches + Registration Account Custom

I have an e-commerce store that we are building and the theme we choose has already a image color swatch implemented but I need to improve it with some features:
– Show me when the color is out of stock ( fade the color for example)
– Show me also the other variant when the color is selected that they are out of stock (based on the combination) – When I click the color swatches I need to see the full pictures on the side.
– When I go to the product the first image needs to be the same and I see the swatch image only when I click them – On mobile we need to see in a different way, like o pop-up when you click.

Another thing I need is fix the Account Registration Form (just CSS with a login condition based on the answer of a field)