This example demonstrates how to construct separate color and size legends using D3 v5. A color legend maps ordinal categories to distinct colors, while a size legend uses a square root scale to represent numeric values with varying circle radii. The code defines reusable `colorLegend` and `sizeLegend` functions that handle tick creation, circle rendering, and text labels, then calls them with `selection.call()`. Both legends render as SVG groups with styled text and outlined circles, using `scaleOrdinal` and `scaleSqrt` from the d3 module.