This visualization shows a circle-packing layout of the Flare software package’s class hierarchy, using nested circles to represent the data’s hierarchical structure. The code loads data from `flare.csv` with `d3.csv`, processes it with `d3.stratify`, and computes the layout using `d3.pack`. Circles are colored by depth using `d3.scaleSequential` with the magma interpolator, and the visualization is rendered as SVG. Hovering highlights a node’s ancestors by toggling a `node--hover` class.