This area chart visualizes car sales from 2012 to 2022, combining a smooth line with an orange filled area beneath it. The chart uses D3 v5 APIs including `d3.area`, `d3.line`, `d3.curveBasis` for smoothing, and `d3.scaleTime`/`d3.scaleLinear` for the axes. Data is loaded from a CSV via `d3.csv`, with the line and area paths rendered as SVG elements, styled with CSS classes for the line, area, and axis labels.