电影级景深与柔光渐变背景

创作一张深色渐变背景，带有微妙的大气虚化。明确区分景深层次：前景柔和模糊，中景清晰，背景淡入亮色。使用柔和顺滑的色调过渡、均匀的光线扩散和克制的对比度，营造电影般的景深感。画面保持抽象、整洁，不要可辨认主体、物体、文字、标志、水印、地平线或生硬的视觉接缝。整体应像适合背景板或合成图层的平静编辑背景。让较暗边缘使用深炭蓝色，逐渐过渡至较亮边缘的暖浅灰色，并以微弱强度调整大气密度。

【English Prompt】
Create a deep gradient background with subtle atmospheric fade. Build clear depth separation with foreground soft blur, midground clarity, and background fade into light. Use muted smooth transition, smooth light diffusion, restrained contrast, and a cinematic depth feel. Keep the frame abstract and uncluttered, with no identifiable subject, object, text, logo, watermark, horizon line, or hard visual seam. Preserve a calm editorial atmosphere suitable as a background plate or compositing layer. Use deep charcoal blue at the darker edge, transition toward warm pale gray at the lighter edge, and tune the atmospheric density with subtle intensity.

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