Create a stunning, minimalist mountain and valley landscape composed entirely of circular geometric shapes. The scene features towering mountains with smooth, rounded peaks and deep, flowing valleys, all constructed from overlapping and intersecting circles of varying sizes. Use a vibrant yet harmonious color palette with gradients of deep blues, purples, and soft greens for the landscape, transitioning to warm oranges, pinks, and golds in the sky for a dramatic sunset or sunrise effect. The circles should vary in opacity and size to create depth, with smaller circles forming intricate details in the foreground and larger circles defining the broader shapes of mountains and valleys. The composition is clean, modern, and abstract, with a slight glow effect to enhance the ethereal mood. Add subtle circular patterns in the sky to suggest clouds or stars, maintaining the circle-only aesthetic. The final image is high-resolution, suitable for a promotional poster, with a sleek, professional finish.