Add 22 word pools with impostor variants, multi-pool selection, and mobile-optimized UI

Features:
- Impostor-specific words: Each civilian word now has a related impostor word
- 22 word pools total (2 local offline, 20 remote)
- Multi-pool selection: Combine multiple categories simultaneously
- Descriptive category names based on content analysis

Word pools added:
- Local: Animales y Naturaleza (88), Objetos Cotidianos (99)
- Remote: Marcas y Empresas, Profesiones, Comida y Bebidas, Lugares del Mundo,
  Deportes, Películas y Series, Escuela, Tecnología, Vehículos, Instrumentos,
  Videojuegos, Personajes (Anime, Disney, Ficción), Artistas Latinos,
  Marcas de Lujo, Cuerpo Humano, Playa y Verano, Amor y Romance, Navidad

UI improvements:
- Mobile-first: No scrolling on main setup screen
- Compact layout: Reduced padding, margins, and font sizes
- Hidden scrollbar: Pool selector with gradient fade effect
- Responsive grid: 2-column pool buttons with smooth touch scrolling
- Updated labels: Shortened for better mobile fit

Technical changes:
- New word format: civilian_word|impostor_word in .txt files
- Updated manifest.json with all 22 pools
- Enhanced pickWords() to merge multiple selected pools
- Improved caching system for remote pools
- Cross-browser scrollbar hiding

Documentation:
- Updated README.md with all 22 pools and new features
- Added CHANGELOG.md with detailed changes
- Documented impostor word format and usage

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

README.md

@@ -1,23 +1,45 @@
 # Impostor Game (offline)
 
 ## What is it?
-Role-based impostor-style game for mobile, 100% in the browser with no backend. Uses localStorage so a reload doesn’t lose the match.
+Role-based impostor-style game for mobile, 100% in the browser with no backend. Uses localStorage so a reload doesn't lose the match. Features **impostor-specific words** for each civilian word to make the game more challenging!
 
 ## Structure
 - `index.html`: main UI.
-- `styles.css`: mobile-first styles.
-- `script.js`: game logic (roles, timers, voting, tiebreaks, word pools).
-- `word-pools/`: word pools in `.txt` + `manifest.json`.
+- `styles.css`: mobile-first, no-scroll optimized styles.
+- `script.js`: game logic (roles, timers, voting, tiebreaks, word pools with impostor variants).
+- `word-pools/`: 22 word pools in `.txt` + `manifest.json`.
 
-## Available pools
-- Animals & Nature (🌿) — `animales_naturaleza.txt`
-- Daily Life (🏠) — `vida_cotidiana.txt`
-- Sports (🏅) — `deportes.txt`
-- Brands (🛍️) — `marcas.txt`
-- Music (🎵) — `musica.txt`
-- Characters (🧙) — `personajes.txt`
+## Available pools (22 total)
 
-`.txt` format: optional first line header `# emoji Name`; the rest is one word/term per line.
+### Local pools (work offline, embedded in code):
+- 🌿 Animales y Naturaleza (88 words) — `animales_naturaleza.txt`
+- 🏠 Objetos Cotidianos (99 words) — `objetos_cotidianos.txt`
+
+### Remote pools (require internet connection):
+- 🛍️ Marcas y Empresas (81 words)
+- 💼 Profesiones y Trabajos (94 words)
+- 🍕 Comida y Bebidas (145 words)
+- 🌍 Lugares del Mundo (89 words)
+- ⚽ Deportes (97 words)
+- 🎬 Películas y Series (118 words)
+- 📚 Escuela y Educación (114 words)
+- 💻 Tecnología e Internet (63 words)
+- 🚗 Vehículos y Transporte (97 words)
+- 🎸 Instrumentos Musicales (106 words)
+- 🎮 Videojuegos (128 words)
+- 🎌 Personajes de Anime (133 words)
+- 🏰 Personajes de Disney (133 words)
+- 🎤 Artistas Latinos (116 words)
+- 💎 Marcas de Lujo (108 words)
+- 🦸 Personajes de Ficción (124 words)
+- 🫀 Cuerpo Humano (129 words)
+- 🏖️ Playa y Verano (69 words)
+- 💕 Amor y Romance (98 words)
+- 🎄 Navidad y Fiestas (88 words)
+
+**New feature:** You can select **multiple pools** simultaneously to mix categories!
+
+`.txt` format: `# Header` on first line (optional), then `civilian_word|impostor_word` pairs, one per line.
 
 ## Key rules
 - Defaults: up to 10 players; impostors by player count (<=5 →1, 6-7 →2, >7 →3) and never more than half.
@@ -37,11 +59,26 @@ python -m http.server 8000
 
 Open in browser: `http://localhost:8000`
 
+## Word format with impostor variants
+Each word pair consists of:
+- **Civilian word**: What most players see
+- **Impostor word**: A related but different word that impostors see
+
+Example from `animales_naturaleza.txt`:
+```
+Oso|Pez
+Camello|Arena
+Elefante|Safari
+```
+
+This makes the game more interesting as impostors have a related word to work with!
+
 ## Add new pools
-1) Create a `.txt` in `word-pools/` with optional header and one word per line.
-2) Add an entry in `word-pools/manifest.json` with `id`, `name`, `emoji`.
-3) (Optional) add an embedded version in `script.js` if you want it available without the files.
+1) Create a `.txt` in `word-pools/` with optional header `# Name` and pairs `civilian|impostor` per line.
+2) Add an entry in `word-pools/manifest.json` with `id`, `name`, `emoji`, `count`, and optionally `local: true`.
+3) (Optional) To make it work offline, add an embedded version in `script.js` `EMBEDDED_POOLS` array.
 
 ## Notes
-- State is saved in `localStorage` (`impostorGameStateV2`). Use “New match” to clear it.
-- Mobile friendly: reveal via swipe or tap; adaptive UI.
+- State is saved in `localStorage` (`impostorGameStateV2`). Use "New match" to clear it.
+- Mobile optimized: **No scrolling required** on setup screen, reveal via swipe or tap, compact adaptive UI.
+- Pool selection grid has vertical scroll when needed to fit all 22 categories.