diff --git a/CLAUDE.md b/CLAUDE.md
index c355f6a..24f7760 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -4,18 +4,65 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Overview
 
-A single-file, zero-dependency Elden Ring death counter (`Elden Ring Counter.html`). Open directly in any browser — no build step, no server needed.
+Elden Ring-themed death counter for Schmendrizzle's Twitch stream. Originally a single standalone HTML file; now a Deno server with real-time multi-client WebSocket sync. Compiles to a self-contained Windows `.exe` via `deno compile`.
+
+## File Structure
+
+```
+EldenRingCounter/
+├── server.ts               # Deno HTTP + WebSocket server
+├── desktop.html            # Main counter page with YOU DIED overlay
+├── mobile.html             # Touch-optimized control page
+├── obs.html                # Transparent browser source for OBS
+├── Elden Ring Counter.html # Original standalone file (localStorage), kept for reference
+└── .gitea/workflows/
+    └── release.yml         # Builds and publishes Windows .exe on tag push
+```
 
 ## Architecture
 
-Everything lives in one HTML file with three sections:
+**`server.ts`** — Single `Deno.serve({ port: 8080 })` handling:
+- `GET /` → `desktop.html`
+- `GET /mobile` → `mobile.html`
+- `GET /obs` → `obs.html`
+- `GET /ws` (WebSocket upgrade) → real-time sync
 
-- **CSS** (lines 8–339): Elden Ring-themed dark UI using CSS custom properties (`--gold`, `--bg0`, etc.). The "YOU DIED" overlay is CSS-animation-driven via the `.show` class.
-- **HTML** (lines 342–376): Static markup. `#roman` and `#arabic` are the display targets; `#overlay` holds the death animation.
-- **JS** (lines 378–468): Vanilla JS. `deaths` is the single state variable, persisted to `localStorage` under key `elden_deathcounter_value`. `render()` syncs state → DOM → storage. `add(delta)` is the only way to mutate count; it triggers the overlay on increment.
+State: single `deaths` variable in memory, broadcast to all clients on every mutation. Persisted to `counter.json` in cwd after each change; loaded on startup.
+
+**WebSocket protocol:**
+- Client → server: `{"action": "increment" | "decrement" | "reset"}`
+- Server → all clients: `{"count": 42}`
+
+**`desktop.html`** — Full counter UI. WebSocket client with auto-reconnect. YOU DIED overlay triggers when received count is higher than previous. Keyboard controls: `+`/`=`/`↑` increment, `-`/`_`/`↓` decrement, `R` reset.
+
+**`mobile.html`** — Large touch buttons only. Same WebSocket client, no overlay.
+
+**`obs.html`** — Fixed-size (`440×160px`) display box with transparent background. No controls, no status indicator.
 
 ## Key constraints
 
 - Roman numeral display is capped at 3999 (`clamp(0, 3999)`); 0 displays as `—`.
 - The overlay animation restarts cleanly via a forced reflow (`void overlay.offsetWidth`) before re-adding `.show`.
-- UI language is German (`lang="de"`); string literals like `"Tode:"` and `"Gespeichert lokal ✓"` are in German.
+- UI language is German (`lang="de"`); string literals like `"Tode:"` are in German.
+- `obs.html` has a fixed size so the layout never jumps as numbers grow.
+
+## Commands
+
+```bash
+# Dev
+deno run --allow-net --allow-read --allow-write server.ts
+
+# Build Windows .exe
+deno compile \
+  --allow-net --allow-read --allow-write \
+  --include desktop.html \
+  --include mobile.html \
+  --include obs.html \
+  --target x86_64-pc-windows-msvc \
+  --output elden-counter.exe \
+  server.ts
+```
+
+## CI
+
+`.gitea/workflows/release.yml` triggers on `v*` tags. Builds the Windows `.exe` and publishes it as a release asset via `softprops/action-gh-release`.