Full composition poster design, no text, 3D render of a sleek floating laptop and smartphone displaying glowing marketing dashboards with bar charts, line graphs trending upward, ROAS and CAC metric cards, percentage numbers on screens, dark charcoal background #202127, screens emit soft indigo-purple glow #544c9a, floating small 3D data cubes and geometric shapes around devices in muted indigo and amber tones, holographic data streams connecting between screens, subtle grid lines on background suggesting data structure, dramatic underlighting from screens reflecting on surface below, photorealistic octane render, premium studio lighting, ultra sharp, 8k, left and top area of composition dark and empty for text overlay, devices positioned center-right, depth of field, no typography, no words, no letters