Meet the accessibility baseline

Target WCAG 2.2 AA practices: semantic landmarks and headings, keyboard-complete operation, persistent visible focus, accessible names, 4.5:1 normal-text contrast, text alternatives for meaningful images, announced cart/status changes, associated error guidance, no color-only meaning, and reduced-motion support. PayPal handoff and return must preserve understandable focus and status. Test at 200% zoom and with a screen reader before MVP acceptance.