Cinematic charcoal and crimson background

Compose for a 21:9 ultra-wide cinematic background plate with long lateral flow and large quiet areas of dark atmosphere. Keep the overall frame deep charcoal to black, and let a low pool of dark crimson fog drift along the bottom edge with soft curls and realistic volumetric depth. Add a very subtle horizon-level glow near the center that fades outward, like distant light diffusing through haze, with no hard edges and no solid stripes. Maintain minimal detail and a premium finish: soft grain, smooth gradients, and restrained ember-like particles that are tiny and widely spaced. Color bias stays obsidian and oxblood with a gentle red glow, reading as moody atmosphere rather than graphic design.