Tone: Warm, plain language; short sentences to reduce cognitive load.
Privacy: “Public mode” hides numbers. Long-press peek avoids toggling off privacy in crowded places.
Clarity: One primary “Next step” with time estimate; chunked cards; tabular/monospace-like numeric spacing for calm scanning.
Accessibility: High contrast, large targets, reduced motion friendly, screen-reader labels, dark-mode support.
Performance: No images or web fonts; all inline for data-light loads.