Responsive Design Is Product Behavior, Not Just Smaller CSS
A professional responsive editor lets each viewport inherit sensible defaults and override the decisions that genuinely need to change.
Independent does not mean duplicated
Content can remain shared while size, alignment, spacing, visibility and media framing change by device.
Preview must edit the real behavior
A device button is useful only when edits made in that viewport are stored and rendered for that viewport.
Media framing is part of the design
Object position, size, crop and visibility often need different values on mobile than on desktop.
Need help applying this thinking to a real system?
MDLoops can turn the operational model into architecture and an implementation plan.