How do you implement accessible linear design across light and dark modes?

The Web Content Accessibility Guidelines (WCAG) 2.2, the latest version as of October 2023, does not mandate dark mode for digital content but emphasizes optimal color contrast across all viewing modes, including light and dark modes. It specifies a minimum contrast ratio of 4.5:1 for normal-sized text and a lower ratio of 3:1 for large text and visual UI elements like buttons, ensuring readability and accessibility. While the upcoming WCAG 3 is expected to introduce specific rules for light and dark modes, current guidelines apply universally to all modes. Most UI component libraries, such as Radix UI, support accessible light and dark mode designs, allowing users to switch modes easily, and these libraries often use neutral colors that can be inverted for different modes to maintain simplicity and accessibility. Linear-style systems, which often avoid brand colors for a more neutral palette, ensure compliance with WCAG standards by adhering to color contrast requirements while offering users an accessible and consistent experience.