TITLE: Enigma — Field Cipher Machine

FULL PROMPT:
Build a self-contained interactive page titled "Enigma: Field Cipher Machine" — a working rotor cipher on canvas. Implement three stepping rotors (I/II/III wirings, notches Q/E/V), reflectors B and C, ring settings 1–26, plugboard pairs, and M4 mode adding a non-stepping thin rotor (β/γ) between rotor I and the reflector. Signal path: plug → rotor III → II → I → (thin) → reflector → (thin) → I → II → III → plug, each rotor stage x↦(W[x+p−g]−p+g) mod 26 with inverse wiring for the return leg. Stepping before each key: right rotor advances; if it sat on its notch the middle advances too, and if the middle sat on its notch the left advances (historical double-step). Draw: bakelite case with brass rivets, 26-lamp board with amber afterglow on the output lamp, ivory rotor windows with neighbour-letter hints and notch flags, engraved ring badges, plugboard with colored bezier cables, IN/OUT ticker, keypress/turnover telemetry. Interaction: real keyboard input (A–Z, Backspace), tap lamps to type, click rotor windows/rings, click plugs to pair, buttons for mode/reflector/thin/random keys/random plugs/reset. All inline, no external resources.

INTENDED DESIGN DESCRIPTION:
A dark bakelite cipher box that actually encrypts — letters you type roll through three visible rotors, the lampboard flashes the scrambled output, and the notch flag warns you the next keypress will drag two rotors at once.

MAJOR VISUAL TECHNIQUES:
- True Enigma wiring math with ring offsets and inverse paths
- Notch/double-step mechanics surfaced as a live "NOTCH ARMED" indicator
- Amber lamp afterglow keyed to the last ciphertext letter
- Bezier plugboard cables colored per pair
- Brass-riveted bakelite cards with ivory window plates

INTENDED INTERACTION MODEL:
Type (keyboard or lamp taps) to encrypt; click windows to step rotors, ring badges to set rings, labels to swap rotor order, plug letters to pair/unpair; mode and randomize buttons reconfigure the machine live.