Stormy Sequoia Canyon MTB Background in Autumn

Landscape nature photograph: grand canyon style canyon at stormy dramatic, autumn. national geographic editorial photography, muted pastel palette. Sharp focus, magazine-grade depth, dramatic atmospheric light, photoreal output, no watermarks. Photorealistic, naturally accurate light and ecology. No people in foreground unless requested. Specifically: sequoia giant trees. Target search intent (rendered visually, no on-image text): "mtb background" (en).