扁平化办公用品图标元素

Low-saturation flat minimalist library resource icons on white background, soft muted color palette with maximum two colors per icon, pixel-perfect vector style, library card with barcode in dusty blue and light gray, book stack in soft powder blue and cream, returned cart in muted sky and off-white, shelf marker in dusty azure and light beige, reading lamp in soft steel blue and cream, computer catalog in muted slate and gray, study carrel in dusty periwinkle and light gray, book drop in soft blue-gray and cream, reference desk in muted cadet blue and sand, nine icons evenly distributed in three rows and three columns, clean geometric shapes with harmonious low-saturation palette, no facial expressions, pure minimalist library representation.