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Design a column-based browser for nested content: think categories, items, and details, all visible at once. The left column sets context, the middle column lets users drill in, and the right column shows the active selection or preview. This is for people who need to compare related records quickly without opening separate pages.

Each column should scroll independently and keep its own header visible. Show the active path clearly so users always know where they are in the hierarchy. Selection should update the next column in place, not reset the whole view. If content is long, use sticky section labels, subtle dividers, and a clear selected row state to keep the scan path obvious.

Design the responsive behavior too. On narrower screens, the columns should collapse into a step-by-step flow or stacked panels with a strong back affordance. Preserve the current selection, keep nearby actions reachable, and make it easy to return to a previous column without losing context. Include empty, loading, and no-results states for each column so the layout still feels complete when data is sparse.