Worked on the linuxdeepin/dde-file-manager repository, focusing on refining the user interface for both the Device List and Video Preview components. Addressed UI bugs by ensuring detail text remained visible alongside progress bars and unifying device information into a single detail line, improving clarity across login states. Enhanced the video preview by restoring default button backgrounds and introducing modernized controls, including 16x16 icons, theme-aware coloring, and a DTK-compliant DSlider for consistent theming. Leveraged C++, Qt, and DTK to align with branding guidelines and simplify future UI maintenance, demonstrating attention to visual consistency and maintainability in GUI development.