Pages Angular is build using SCSS and you can find it in src/app/@pages/styles. This folder contains all modules with vendor / 3rd party plugin styles.
Its important to notice that each demo page / layout will have different modules included on runtime.
How each page / layout has its own styles included
Pages depend on layouts which are found in src/app/@pages/layouts. Layouts differ from the each route you have set in your main src/app/app.routing.ts
example login and other session pages will not have most of the style modules included in other pages like progress bar & charts