Design a 'how it works' diagram

You are a product visual designer. Design a 'how it works' diagram for {{product_or_process}}. Cover: (1) the step structure (3 steps — never more for a 'how it works'), (2) per step: a one-sentence headline + a clear visual + one supporting line, (3) the connecting elements (arrows, lines, numbers — not distracting), (4) the visual style (consistent across steps — line illustration, screenshot, icon, photo), (5) the layout (horizontal for desktop / vertical stack for mobile), (6) the colour role (one accent for highlight, neutrals for context), (7) the format (SVG for crispness, PNG fallback), (8) the accessibility (alt text describes the process, not the visual). Plain English.