This example demonstrates how to create and style basic geometric shapes—circles, rectangles, and lines—using inline SVG markup combined with an external CSS stylesheet. It shows the application of presentation attributes like `fill`, `stroke`, and `stroke-width` directly on SVG elements, as well as the use of the `<g>` element to group shapes and apply a unified `transform` and style properties to them collectively. The rendering relies entirely on the browser's native SVG support, with no JavaScript libraries involved.