Act as a product designer with 10 years of experience in IoT devices. Create a detailed visual concept for a modern smart thermostat equipped with advanced occupancy detection technology. The design should feature a sleek, minimalist interface with a [circular touchscreen display] that seamlessly integrates into any home decor. Highlight its energy-saving capabilities by showing a dynamic [adaptive temperature adjustment graph] based on detected room occupancy. Include a [compact motion sensor module] discreetly placed near the device to emphasize its smart functionality. Use a neutral color palette with subtle accents to convey sophistication and efficiency, and ensure the product looks futuristic yet approachable for everyday use.