Responsive Validation

Responsive design is not "there are media queries." It is the claim that the experience holds up across the sizes, inputs, languages, and settings real people use. This skill tests that claim.

Start here

1. Read references/_shared/experience-core.md.
2. Read references/_shared/experience-operating-contract.md; if the project can run, rendering is required for meaningful responsive work, not an optional suggestion.
3. Decide the audience's real conditions before choosing sizes (references/validation-matrix.md).

Core rules in brief. These apply even before you open references/_shared/experience-core.md. Read that file (the full rules and evidence levels) before a full review, repair, or build.