Flat vector illustration, system architecture diagram in a modern blueprint poster style. Deep blue background with a subtle grid/graph-paper pattern, thin dark blue border frame. Bold white sans-serif title at top reading "SYSTEM DESIGN". Rounded-corner icon style throughout, flat colors (teal, light blue, white, orange accent), thick dark outlines on every shape, no gradients or photorealism, no shadows. Layout, left to right, top to bottom: Top-left, inside a large rounded outline container: three client icons side by side — a desktop browser window (labeled "Squarespace site"), a laptop/dashboard icon (labeled "Web app"), and a smartphone with a camera-scan icon (labeled "Mobile app") — each with a small white arrow pointing right toward a stack of three rounded rectangle cards labeled "Auth", "Festivals & Artworks", "Orders". Top-right: a white fluffy cloud icon with two arrows pointing down into a teal-and-blue cylindrical database stack (three stacked disc layers, labeled "PostgreSQL"). The card stack in the center connects rightward with a white arrow into the same database cylinder. Bottom-left: an orange jigsaw-puzzle-piece icon (representing "Payment integration / Stripe") connected by a line to a smaller blue cylinder database icon (labeled "Photo storage"). Bottom area: a gear icon (representing backend services) connected to a drafting compass icon, which connects up to the puzzle piece and photo storage icons. Bottom-right: a rounded outline icon containing a Ver más