Developed and delivered the Clarity Theme for Sphinx in the writethedocs/www repository, introducing a modern documentation interface with light and dark modes and a fully responsive layout. The work focused on enhancing readability and maintaining consistent branding across devices, reducing the need for custom styling by documentation authors. Leveraging Sphinx theming, CSS, and reStructuredText, the implementation prioritized accessibility and cross-device compatibility. Collaboration with design and core maintainers ensured the theme met quality standards and provided a smooth upgrade path. This project established a robust foundation for future theming enhancements and streamlined the adoption of cohesive user interfaces across documentation projects.