Design a compact, three-wheeled, outdoor cleaning vehicle equipped with an efficient vacuum system for collecting litter in urban and park environments. The vehicle should have a modern, ergonomic design and be maneuverable enough to navigate narrow streets and pathways (width as narrow as 1 meter). Include a flexible suction hose for hard-to-reach areas, a waste collection tank with at least 100 liters capacity, and an eco-friendly power source such as a rechargeable battery or solar panels. The design should consider operator comfort, low noise levels, and easy maintenance. Provide detailed exterior visuals, showing the vacuum system placement and waste tank integration, and explain the functionality of key components.