渐变蓝科技感背景光效简约商务海报设计素材

High-resolution 4K blue background for commercial use, gradient from light sky blue to deep navy blue, with subtle geometric grids and thin white lines, soft glowing halos at the corners, small floating particle elements (like tiny stars), clean and minimalist texture, no redundant patterns, suitable for tech product displays and corporate websites, ultra-smooth color transitions, bright but not harsh light, 8K detail rendering