During September 2025, Jan Müller focused on stabilizing theme typography within the thedevdojo/wave repository, addressing a persistent issue with default text color overrides in the Anchor Theme. By wrapping paragraph text color styling in an @layer base directive, Jan ensured that color overrides would consistently align with Tailwind CSS v4 behavior, reducing UI inconsistencies across themes. This targeted CSS fix improved frontend reliability and maintainability, as it provided a clear layering approach for theme color management. Jan validated the changes through focused checks, demonstrating a methodical approach to frontend development and a strong understanding of CSS and Tailwind CSS best practices.