During October 2025, Zhaoquan developed a theme switching system for the adityatelange/hugo-papermod repository, focusing on improving accessibility and user experience. He implemented a data-theme attribute approach to manage light and dark modes, replacing legacy .dark selectors with attribute-based CSS for more reliable and maintainable theming. Using CSS, HTML, and JavaScript, Zhaoquan refactored the initialization and toggle logic to ensure consistent theme state across the application. He also removed redundant styles, streamlining the codebase for better performance. The work was collaborative, with co-authored commits, and demonstrated a solid understanding of front end development and modern theming practices.