A clean, minimal engineering technical drawing background in blueprint style. Light blue or white background with thin gray or blue linework. Orthographic projections of simple mechanical components such as gears, shafts, brackets, and plates. Include dimension lines, arrows, centerlines, dashed hidden lines, and a subtle grid. No text labels, no numbers, no logos. Flat 2D CAD drafting style, precise and professional, low contrast, suitable as a background image. See more