Implement responsive design for websites and web apps — from standard mobile-first layouts to complex patterns (sticky elements, scroll coordination, data tables, dashboards). Three modes: transform existing sites, build responsive from scratch, or launch a live multi-breakpoint preview. Surfaces design forks where there's no single right answer. Use when building responsive layouts, fixing mobile issues, adding breakpoints, working with sticky/scroll patterns, previewing breakpoints, or when the user mentions responsive, mobile, breakpoints, viewport, adaptive design, or responsive preview.
2026-04-04