The CSS @layer at-rule

The CSS @layer at-rule helps solve challenges in building modular UI libraries without build systems. It allows developers to assign selectors to different groups and define their cascade order, regardless of source loading order. This feature is particularly useful for managing utility classes and component styles in separate files. By using @layer, developers can ensure that styles are applied correctly, even when CSS files are loaded in an unexpected order, resulting in more predictable and manageable stylesheets.