소개
Guides the creation of adaptive user interfaces by enforcing mobile-first development principles. This skill ensures layouts are built with fluid containers, relative units like `rem` for scalability, and consistent breakpoints for predictable behavior across devices. It covers essential practices such as creating touch-friendly targets, optimizing images for performance, and maintaining readable typography, making it invaluable for any task involving responsive UI development, from creating new layouts to refactoring existing ones for multi-device support.