Redesign this VPN app screenshot for a company called 'USPVPN'. Replace the current logo (the cat) and the name 'DoDo APP Proxy' with new branding for 'USPVPN'. Create a new, modern, and sleek logo for USPVPN, perhaps featuring a shield, a key, or an abstract symbol of security and speed. Also, change the text 'DoDo Guard' to 'USPVPN Guard'. Keep the dark theme and the overall layout, but give it a more premium and professional look. Generate 3 different design variations.
