The classic 25/5 Pomodoro was built for a 1980s desk job. Cortex is shaped around long-haul study: 50-minute focus blocks with breaks that grow as a session stretches, matching how attention actually decays over a marathon.
During a block the interface all but disappears — a single dimmed ring and the time remaining. Everything celebratory waits for the break screen, where it can’t pull you out of the work.