Dark mode is not a black-background copy of the light theme. Contrast, layers, shadows and accent colors need to be reconsidered for different lighting conditions. Pure black can create harsh contrast in long text, while dark navy or neutral gray often provides a more balanced reading experience.
Do not separate layers with shadows alone
Shadows can lose their effect on dark surfaces. Use subtle brightness differences, thin borders and controlled surface colors to separate cards and overlays. Every layer does not need to be lighter; the hierarchy simply needs to remain consistent and understandable.
Retest accent colors
A saturated blue that feels balanced in light mode may vibrate on a dark background or reduce readability. A lighter or less saturated brand variation may be necessary. Do not communicate status through color alone; support it with icons and text.
- Test text contrast at different display brightness levels.
- Ensure focus rings remain visible on dark surfaces.
- Use appropriate photo and logo variants for both themes.
- Respect the system preference and persist the user’s choice.
The success of dark mode should not be measured by aesthetics alone. Track real usage through signals such as reading time, error rate and theme-switching behavior.
