等角像素风：方块化的建筑图解

Create an isometric illustration of a small building in a crisp flat vector style. Show the geometry on a strict isometric grid with all vertical lines truly vertical and all horizontals at thirty degrees, no perspective convergence anywhere. Render every surface as a flat colour with no gradient, using three tones of each hue to distinguish the three visible faces — lightest on top, mid on one side, darkest on the other — so form reads through value alone. Detail the building with simplified but recognisable elements: windows as flat rectangles with a lighter inner shape, a door, a stair drawn as stepped prisms, a roof with visible thickness. Show simplified surroundings on the same grid — a few cubic trees, a flat path, a tiny car — with a plain background colour and a soft flat shadow beneath each object. Keep the palette to six or seven cheerful muted colours. Flat isometric vector illustration, crisp edges, no texture, no photorealism.