This pie chart visualizes product sales distribution across categories, using a standard D3 pie layout with labeled slices and a color-coded legend. The data is loaded from a remote CSV file via `d3.csv` and rendered as SVG. It uses `d3.pie()` for arc generation, `d3.arc()` for path construction, and `d3.scaleOrdinal` with `d3.schemeCategory10` for categorical colors, with text labels positioned using `arc.centroid`.