What methods and techniques of interface layout are you familiar with and have used in your projects?

I am familiar with and have used the following methods and techniques for interface layout:

• Flexbox — for creating flexible and responsive layouts, convenient for aligning elements along an axis and distributing space.
• CSS Grid — a powerful tool for building complex grid structures with control over rows and columns.
• Media queries — for adaptive layout across different screen sizes.
• BEM (Block, Element, Modifier) — a methodology for naming classes to support maintainable and scalable CSS structures.
• Preprocessors (Sass, Less) — for convenient writing of CSS with variables, nesting, and mixins.

In projects, I used a combination of these techniques to create user-friendly, responsive, and maintainable interfaces.