This chart compares smartphone brands by average price and average units sold. Animated, rounded bars display average prices against a black background, while a glowing cyan line overlays the same chart to show average units sold, using a dual y-axis for the different scales. The visualization is built with React and D3 v6, using `scaleBand`, `scaleLinear`, `axisBottom`, `axisLeft`, and `axisRight` to construct the scales and axes. Data is loaded from a gist CSV and aggregated by brand, with hover tooltips and drop-shadow filters adding interactivity and visual polish.