Motion Background Ambient, living backgrounds that sit behind content without stealing focus. The goal is subtle, seamlessly looping motion that stays readable and performant. This skill is self-contained: every technique below ships its own runnable code — CSS, GLSL, and canvas — with no external dependencies beyond Three.js where a shader is involved. When to use - Hero/landing background that subtly moves; section ambience. - Login/splash/empty-state living backdrops. - A gradient, mesh, aurora, shader, or particle/constellation field behind text or UI. Pick an approach | Look | Technique…