Dark Mode Specification for Existing Product
Technical guide for implementing dark mode in a light-only product, covering all components and edge cases.
Plan and specify dark mode implementation for an existing digital product, ensuring all components, illustrations, and dynamic content render correctly in both themes.
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Prompt objective
Plan and specify dark mode implementation for an existing digital product, ensuring all components, illustrations, and dynamic content render correctly in both themes.
Real use case
A regional food delivery platform has a restaurant partner dashboard available in light mode only. Restaurant owners who work late shifts report visual fatigue, and the dashboard's usability NPS dropped 12 points last quarter among night users.
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Prompt
Specify dark mode implementation for [PRODUCT NAME], currently available in light mode only. The product uses [FRAMEWORK/TECHNOLOGY] and has approximately [NUMBER] components in the design system.\\\\\\\\n\\\\\\\\n**1) Current State Audit:**\\\\\\\\n- Checklist of components requiring adaptation\\\\\\\\n- Inventory of hardcoded colors vs. existing tokens\\\\\\\\n- Assets needing alternative versions (icons, illustrations, logos)\\\\\\\\n- Dynamic content (user images, videos, embeds)\\\\\\\\n\\\\\\\\n**2) Dark Color Strategy:**\\\\\\\\n- Background layers: surface-0 (base) through surface-5 (maximum elevation)\\\\\\\\n- Elevation rule: how to represent depth without light box-shadow\\\\\\\\n- Saturation adjustment: reduce primary colors by [PERCENTAGE]%\\\\\\\\n- Semantic colors in dark mode (success, error, warning, info)\\\\\\\\n- Text: opacity hierarchy (87%, 60%, 38% on dark background)\\\\\\\\n\\\\\\\\n**3) Critical Components:**\\\\\\\\n- Inputs and forms: borders, placeholders, validation states\\\\\\\\n- Cards and containers: subtle borders vs. elevation\\\\\\\\n- Modals and overlays: backdrop opacity, surface level\\\\\\\\n- Tables: row alternation, hover, selection\\\\\\\\n- Charts and data viz: alternative palette for legibility\\\\\\\\n- Maps: dark tile layer\\\\\\\\n\\\\\\\\n**4) Edge Cases:**\\\\\\\\n- Images with white backgrounds (partner logos, screenshots)\\\\\\\\n- Rich content (embedded HTML, inline PDFs)\\\\\\\\n- Transactional emails (app dark mode not supported)\\\\\\\\n- System status bar and navigation\\\\\\\\n- Mode transition (animated or instant cut)\\\\\\\\n\\\\\\\\n**5) Implementation:**\\\\\\\\n- CSS strategy: \\\\\\\\\\\\\\\\\\\\\\\`prefers-color-scheme\\\\\\\\\\\\\\\\\\\\\\\` vs. class on \\\\\\\\\\\\\\\\\\\\\\\`<html>\\\\\\\\\\\\\\\\\\\\\\\`\\\\\\\\n- Preference persistence (localStorage + respect OS setting)\\\\\\\\n- Toggle UI: placement and switch design\\\\\\\\n- Gradual rollout: feature flag by percentage of users\\\\\\\\n- Automated testing: screenshot comparison per component\\\\\\\\n\\\\\\\\nPrioritize the [NUMBER] most-used components for the first rollout phase.
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