Secret Santa Draw Generator

Paste one participant per line, add exclusion rules like "Alice - Ben" to keep couples (or rivals) from drawing each other, and generate a complete, valid draw. The algorithm shuffles with Fisher–Yates and rejects any assignment that violates the rules — a uniformly random derangement, expected after ~e attempts (Sattolo-style single-cycle shuffles would not be uniform) — and falls back to constraint backtracking when exclusions get dense, proving honestly that no valid draw exists instead of silently breaking a rule. Results come as collapsed sealed cards the organizer opens or forwards one at a time, plus per-person copy-ready messages that each contain only that participant's match. Names can carry a wishlist ("Alice :: warm socks in size M") which is revealed to whoever draws them. Optional gift budget and exchange date are stamped into every message. A blank seed gives a fresh draw; reusing a seed reproduces the identical result, so you can regenerate or verify a draw later. Everything runs offline — no accounts, no emails, no data leaves the tool.