Detailed cinematic illustration of a sustainable Belgian city in 2050, with green rooftops, vertical gardens, solar panels, and urban farming on rooftops and terraces. Young adults collaborate on sustainability projects: planting vegetables, participating in a community initiative in the park. Architecture blends modern eco-design with warm public spaces. Streets are clean, with trees, natural light, and water features. Far beyond the city, large wind turbines are visible in the countryside. Style: cinematic concept art + realistic digital illustration, highly detailed, vibrant natural colors, dynamic lighting, soft sunlight.