动线分析图：分流、交会与瓶颈

Create a circulation analysis diagram overlaid on a simplified building plan. Render the plan itself in a deliberately quiet register — walls as thin grey lines, rooms unfilled, furniture omitted — so it recedes to become a background. Overlay the circulation as bold flowing ribbons of colour with rounded ends, one colour per user group: blue for visitors, orange for staff, green for service and deliveries, each following its actual route through the plan with arrowheads showing direction. Detail the vertical circulation as a circular node where the ribbons meet a stair or lift, with a small icon inside. Show the points where two ribbons cross highlighted with a red ring, so conflicts are visible. Add a legend naming each route colour and a note of the daily flow count beside it. Keep everything flat with partial transparency where ribbons overlap. Diagram style, white background, no shadows, no perspective, no photorealism.