A falling-ember background: a parallax field of hot embers, each an incandescent core in an additive-glow halo, stretched into a soft motion-blur streak as it drifts and flickers down. Near embers big/bright/fast, far ones dim/slow. 2D canvas with additive blending, seeded PRNG for deterministic spawn layout, honors prefers-reduced-motion.
pnpm dlx shadcn@latest add "https://crucibleui.com/r/cinder.json"