A single red circle rendered in SVG, centered within a full-viewport canvas, with a green radial line extending from its center to the right edge. The visualization demonstrates basic D3.js v6 setup and styling, using inline SVG elements and a CSS hover animation that rotates the entire group containing both shapes. The code defines a `g` element with an id, positions it via a CSS transform, and applies a keyframe animation on hover that spins the group 360 degrees over five seconds. No data is loaded; the example focuses purely on static geometric primitives and interactive CSS-driven motion within an SVG coordinate system.