How to create a modular and maintainable CSS setup with @layer

CSS @layer directive enables developers to manage cascade hierarchy and style precedence without relying on preprocessors like Sass. By defining explicit layers (settings, base, utilities, components, patches), teams can organize stylesheets modularly, eliminate !important hacks, and maintain predictable styling behavior. The approach combines @layer with @import to control cascade order natively, with full browser support replacing traditional preprocessing workflows while keeping architecture clean and maintainable.