Layer + glow
A soft 340px radial glow eases behind the core dot, tinting and trailing to give the light a physical presence rather than a hard edge.
The stage is dark until the pointer arrives. A soft cone of light reveals hidden typography and leaves a trail of glow behind it.
The "lit" copy sits perfectly over the dim copy, but a radial-mask-image only exposes a small circle around the pointer. Move it and the text appears through the darkness.
A soft 340px radial glow eases behind the core dot, tinting and trailing to give the light a physical presence rather than a hard edge.
Only two CSS custom properties (--sp-x / --sp-y) update per frame — no canvas, no DOM writes beyond transform & mask position.