Core components
Calendar (date/range), Modal (confirmation), Form fields, Availability checks
UX focus
Fast feedback, clear availability, mobile-first controls, accessible modals
Data flow
Client selects → availability API → reserve slot → payment → confirmation
Integration
Serverless API routes, Stripe or payment gateway, email confirmations
Design tip: Show blocked and preferred dates visually — use contrasting colors and clear legends.
Performance tip: Load availability lazy, cache common queries, debounce date changes.
Accessibility: Ensure keyboard focus inside modal and clear ARIA labels for dates.