This example demonstrates basic SVG shapes and how they render within a full-viewport responsive layout. The code uses native SVG elements such as `<circle>`, `<path>`, and `<line>`, with attributes like `cx`, `cy`, `r`, `fill`, and `stroke`. A visible red circle is drawn, alongside commented-out shapes and paths with coordinate data, while the document style sets the SVG to fill the entire viewport. The rendering approach is purely declarative SVG markup with no external JavaScript libraries.