This zoomable sunburst visualizes hierarchical data, showing the proportion of food categories across multiple cities. The data is loaded from the `@observablehq/flare` dataset and rendered as an SVG with animated transitions. Users can click on arcs or the central circle to zoom in and out. The code uses `d3.hierarchy`, `d3.partition`, `d3.arc`, and `d3.scaleOrdinal` with an interpolated rainbow color scheme, along with `transition.attrTween` for smooth updates.