Html Tailwind Guideline: Layout — Container Queries. Description: Use @container for component-based responsiveness. Do: Use @container and @lg: etc.. Don't: Media queries for component internals. Good Example: @container @lg:grid-cols-2. Bad Example: @media (min-width: ...) inside component. Severity: Medium. Docs: https://github.com/tailwindlabs/tailwindcss-container-queries.