Prompt: Generate a still image featuring a background for a calm meditative mobile app with a smooth, gradient transition from royal blue to a warmer, purple . It should be dark enough to allow for white text overlay, and display a warm undertone. The gradient should be mostly smooth and texture-free. It may include one or two subtle, vertical-diagonal wave-like separation, resembling soft ripples. The waves should be very minimal, ensuring the background is not overfilled and retains its simplicity.