简约卡通扁平化风格商务人士工人技术人员电梯场景插画

illustration, minimalist style, light blue, beige, brown, and gray color palette, three people, one in black suit and white shirt holding a briefcase opening a door, one in red uniform and hat closing a door, one in blue workwear and red hat operating equipment, modern and retro industrial style elevator, elevator doors, interior, control panel, digital display evenly distributed, digital display shows '09', control panel has numbers 1 to 12, simple background with light colors, elevator door textures, detailed control panel button design, clear and intuitive, conveying the history and usage scenarios of elevators