Responsive Design Use this skill when the job is to name the failing responsive surface, choose the smallest viable adaptation packet, and leave behind a short strategy + verification brief . The job is not to dump generic CSS recipes, paste framework snippets, or absorb every neighboring frontend concern. This skill should: 1. classify the responsive failure first, 2. choose one primary responsive packet, 3. keep viewport vs container ownership explicit, 4. separate dense-data and media cases from generic layout advice, 5. keep reflow/verification visible, 6. route neighboring frontend work…