Sub-collections inside Collections

It would be great to organize a main collection into sub-collections (for example: Forms, Pages, Components, Blog, etc.). This would help keep large projects clean and structured by allowing items to be organized into sub-folders.

Name each stylesheet

When adding multiple stylesheets, being able to rename them (e.g., global.css, forms.css, pages.css) would make management much easier.

Custom fields in Collections

It would be very useful to add custom fields to collection items (title, slug, published date, updated date, booleans, images, numbers, etc.).

This also helps structure and manage stylesheets when working with multiple versions or multiple sets of styles.