简约科技风扁平化设计三色数字界面控制面板插画

minimalist illustration, black background, three invoice templates with different design styles arranged from left to right, blue, green, and red themes, each template includes company name, invoice title, item list, total price, decorative elements such as lines, color blocks, and icons, clean and professional design, suitable for corporate financial management, conveying a sense of efficiency and professionalism