<https://s.mj.run/2ZsignsaOU4> Create a seamless background with smooth, abstract curved patterns similar to flowing waves, featuring a monochromatic color scheme in a dark shade of #30343C. The design should have a soft gradient effect to create depth and a sense of layered movement, with subtle shadows and highlights. Aim for a minimalistic, modern, and elegant look, suitable for a sleek, professional visual style. --style raw