Dark/Light mode with system sync and accessible contrast ratios.

Calculate and split totals in seconds: tip presets + custom input, tax handling, and uneven shares per person with immediate feedback.

Smooth UX details: input masking, live validation, rounding modes, and a celebratory micro-animation when amounts resolve cleanly.

Dark/Light mode with system sync and WCAG-aware contrast, fully keyboard-navigable controls, and clear error states.

Snappy state updates and zero layout shift for a distraction-free flow on mobile and desktop.