Design a calm, high-end booking experience for our wellness spa, paired with an intuitive admin calendar. On the client side, let people browse services, pick a therapist and an open time, and pay upfront—everything should feel effortless and quiet. On the admin side, provide a weekly calendar that makes it easy to see capacity across rooms and therapists, drag-and-drop to move appointments, and trigger reminder messages automatically. Build it as a web app (React + TypeScript) and lean into a luxury_sophisticated look: soft colors, subtle micro-interactions, and generous whitespace.