Use case: photorealistic-natural. Create ONE standalone full-bleed premium photographic website background for Snowbound, a coherent collection about the silence and tactile beauty of snow. Scene: 21:9 panoramic. Elevated photograph of a narrow charcoal meltwater stream making one organic gentle S-bend through an entirely snow-covered treeless plain. Stream restricted to right 40 percent, disappearing at top right. Snow banks naturally undercut and irregular, overcast light, fine grey powder texture. Left 60 percent is uninterrupted matte white snow with faint cool shadows, usable for dark website typography. No ocean, no dramatic peaks, no icebergs. Real editorial landscape photography with plausible cold light, restrained subdued color, natural irregularity and fine film texture, high native detail. Deliberately preserve the stated calm copy space. Avoid artificial gradients, illustration, 3D renders, glossy CGI, surreal shapes, repeated visual motifs, people, footprints, logos, lettering, UI, borders, contact sheets or watermark.