Fill

Concentric elliptical orbits rotate at differential speeds around a bright core. Nodes ride each ring with subtle easing so the system feels mechanical, not linear.

The arrow travels down into the tray, the tray flexes to catch it, and a bar fills to signal completion.

A gooey mass rises from the lower edge on hover, wobbles past level, and settles — the label crossfades to its inverted color as the fill passes.