moderncss

Helps with authoring and reviewing modern CSS for robust, responsive, and accessible UIs — cascade layers, @scope, :has(), nesting, container queries, fluid typography with clamp(), oklch() colors, light-dark() and color-scheme, logical properties, subgrid, and prefers-reduced-motion. Use this skill when the user asks things like "style this component", "make this responsive", "add dark mode", "scope these styles", "fluid type scale", or any CSS authoring, refactoring, or review task — even when they don't explicitly say "CSS".