This interactive scatter plot explores the relationship between fuel efficiency (mpg) and horsepower across vehicles from different origins, with point size encoding weight and color indicating country of origin. Built using the Vega-Lite API on top of D3, the visualization leverages `vl.markCircle`, `vl.x().fieldQ()`, `vl.y().fieldQ()`, `vl.color().fieldN()`, and `vl.size().fieldQ()` to map the Auto MPG dataset from the UCI Machine Learning Repository. The code registers Vega-Lite specifications, applies a custom dark-themed configuration for readability, and renders to an SVG canvas with tooltips for inspecting data points.