A colored stroke briefly follows the pointer. It is like sweeping a flashlight through a dark room and seeing its path linger across the screen.
`colorA` and `colorB` set the fresh and fading colors; their defaults are `#00aaff` and `#ff00aa`. `radius` controls stroke width (default 0.5, range 0.5–2), `length` controls how long it remains (default 0.5 seconds, range 0.1–2), and `shrink` controls how much it tapers (default 1, range 0–1).
This layer draws on its own and needs no image underneath. It reads clearly over a dark background; keep it away from long passages of text, where a moving stroke can distract.
When to use
Use it for pointer decoration, a responsive hero area, or drawing and exploration feedback. Avoid it over dense content that people need to read for a while.