
Keep choices minimal, chunk text into short lines, and rely on clear headings that announce value before detail. Frame every interaction as a micro-goal achievable within seconds, then show immediate reinforcement. If a step requires thinking, remove navigation decisions so effort stays on learning.

Assume one-handed use on crowded trains and busy sidewalks. Place primary actions within the easy-reach zone and keep hit targets generous. Prefer vertical progress with predictable gestures over crowded toolbars. Avoid multi-step precision controls; swap them for tolerant sliders or single-tap choices.

Use micro-progress bars, completion ticks, and short vibrations to celebrate forward motion without breaking flow. Show expected time remaining and a visible finish line. When sessions end abruptly, send a gentle recap and one-tap return link, turning interruptions into satisfying continuity.