Generate an image  of a futuristic , high-tech  swarm background with  a subtle gradient  effect, blending  shades of deep  blues (#212 121) and  purples (# 6c5 ce7),  evoking a  sense of innovation  and professionalism,  perfect for an  enterprise-level PDF  presentation, featuring  intricate, interconnected  nodes and lines  that convey complexity  and sophistication,  with a slight  3D  effect to add  depth and visual  interest.