Sets the container (direction, wrap, justify-content, align-items, align-content, gap, item count) from the fields and lets you override individual items by line — flex grow/shrink/basis, align-self and order — which become :nth-child rules. Output is the container and item CSS with a Tailwind equivalent; the secondary pane holds the HTML skeleton; the preview lays out numbered items exactly as the CSS says. Everything runs locally.