Build a salon booking web app for a single location with several stylists.

1. Services: name, category, duration in minutes, price, buffer minutes after, add ons, which stylists can perform it.
2. Stylists: name, photo, assigned services, weekly working hours, breaks, days off.
3. Availability: compute free slots per stylist per service from working hours minus breaks, existing appointments, service duration and buffer. Never offer a slot that overlaps another appointment for the same stylist.
4. Public booking page: pick service, pick stylist or any available, pick a slot, enter name, phone and email, pay a deposit through Stripe, receive confirmation.
5. Front desk: day view per stylist, check in, add walk ins, move an appointment by dragging, mark no show.
6. Client record: contact details, visit history, color formula and developer, processing time, allergies, photos attached to a visit, notes.
7. Checkout: services rendered, tip, payment method, receipt, and card on file for next time.
8. Messaging: confirmation, reminder before the visit, and a rebooking nudge based on the client's average gap between visits.
9. Reports: revenue per stylist, no show rate, new versus returning clients.

Rules: a cancelled appointment must free the slot immediately, deposits must be refundable only inside the stated window, and a client must never see another client's notes.