What CSS architectures do you know and which one do you prefer?

Among popular CSS architectures, the following can be highlighted:

• BEM (Block Element Modifier) — a methodology that structures classes based on blocks, elements, and modifiers. It helps avoid conflicts and improves readability.
• SMACSS (Scalable and Modular Architecture for CSS) — focuses on dividing styles into categories: base, layout, modules, states, and themes.
• OOCSS (Object-Oriented CSS) — emphasizes separating structure and skin, promoting style reuse.
• Atomic CSS — uses very small classes for individual properties, allowing quick style combinations.

I personally prefer BEM for its simplicity and clarity. It scales well in large projects and makes code maintenance easier. An example of a BEM class:

.button {} /* block */
.button__icon {} /* element */
.button--primary {} /* modifier */

This helps quickly understand the structure and purpose of styles.