Create one standalone premium abstract textured background image for web design. No text, no letters, no interface, no logos, no watermark, no border, no collage. Full bleed. Tactile irregular stochastic grain integrated into the colors, not a visible repeating pattern. Keep useful quiet negative space for website copy. Landscape 16:9. A warm off-white, chalk and pale stone-gray field with exceptionally fine analog noise and subtle paper tooth. Gentle diffuse tonal drift from a pale warm upper left to a slightly cooler gray lower right, no recognizable shapes or objects, no folds, no scratches, no stains. Matte minimal editorial background, quiet enough for dark text anywhere, delicate tactile detail.