spotlight-card

A radial spotlight that follows the cursor across a card. Part of motion-anything; obeys MOTION-SPEC.md. Technique popularized by Aceternity UI, reimplemented dependency-free.

When to use it

• Feature cards, pricing tiles, or a card grid where one should light up under the pointer.

When NOT to use it (restraint)

• Text-dense reading surfaces — the glow distracts. Keep it low-contrast and subtle.
• Touch-only contexts — there is no cursor; it falls back to a static border automatically.