Prompt: A subtle, seamless gradient background for professional portrait photography. Smooth transition from light brown or warm gray at the top to dark brown or cool gray at the bottom. The background should be devoid of any patterns or graphics and completely devoid of texture, providing a minimal yet professional look. The gradient should be very subtle, with no obvious dividing lines or sudden changes, ensuring an even transition of color vertically. Materials should appear cloth or non-reflective to avoid any shine or reflection. The overall lighting needs to be soft and even, without producing shadows or highlights, maintaining the continuity and smoothness of the picture. This background is designed to highlight the foreground without distracting the viewer, giving it a warm and cozy feel.