🏗️ Port Container Crane (2D)

Gantry trolley + hoist cable + swinging load — real pendulum dynamics, not a scripted animation.
Arrow keys also drive the trolley (◀▶) and hoist (▲▼). Click the rail to send the trolley to a point. Space = pause.
Gantry crane trolley/hoist/pendulum-load dynamics — drag the container from ship to stack without spilling it.