How would you design a dark mode for an app that has never had one?

Model answerDark mode is a deceptively complex design problem — it's not just inverting colors. I'd form a cross-functional working group: design, engineering, accessibility. First decision: true black or dark gray (dark gray reduces eye strain in most conditions). Second: which screens are used most at night? Prioritize those. I'd measure adoption rate, session length at night vs day, and accessibility compliance score as success metrics.