Clean and Scalable CSS Architecture (2025)

CSS is easy, it's easy to learn, it's easy to write. But actually, it's hard to write scalable and maintainable code especially with large projects that require constant scaling…There are many reasons why this is the case:- In CSS everything is in a global scope. Any change in one file can cause an (un)expected result in another element, or page.

- CSS is a highly mutable language, because of it's cascade nature. Each mutation leads to confusion and unexpected results. - CSS highly depends on the source order.

- On the other hand, specificity can undo everything. It doesn't matter how you structure your code, specificity can break everything. Specificity is one of the biggest problems of CSS.

- CSS is not (easily) scalableWe end up in a cycle of writing more CSS just to fix the old CSS. At some point our whole CSS code becomes too messy and too large. We need a better approach, we need a modular and predictable CSS.