"Design a sleek, modern UI/UX mobile app mockup. Focus on clean lines, intuitive navigation, and a minimalist design aesthetic. Use soft colors and smooth transitions to create a calm user experience. The interface should include a clear home screen, navigation bar, and key app elements such as buttons, icons, and cards. Incorporate rounded edges, simple typography, and balanced spacing for a modern and easy-to-use feel. Avoid excessive detail, focusing on functionality and user-friendly design." --ar 16:9