This interactive treemap visualizes steel scrap exports by partner country and commodity type, using nested rectangles to emphasize trade value hierarchy. Users can click any country cell to drill down into detailed commodity breakdowns, with a reset button restoring the top-level view. Built with D3.js v7, the visualization employs the d3.treemap layout, d3.hierarchy for data structuring, and d3.scaleSequential with an interpolator for the light-to-dark blue color encoding. SVG rendering and 500ms transitions animate layout changes smoothly as the view hierarchy updates.