Soft and immediate: starts without a lazy ramp and settles gently at the end. Motion should feel like the UI responding, not performing. Best for short, high-frequency feedback.

Used for hovers, button press and release, opacity fades, tab preview, confirmation toast, and drill submenu fades.

Decisive and spatial: stronger deceleration into the final position so panels and menus feel like they arrive in place. The curve carries layout change. Meant to read as movement, not invisible chrome.

Used for sidebar and panel open/close, dropdowns, address bar expansion, application menu slide, and other layout travel.