docs: Organize all game design docs into docs/game_design/ with master index

docs/game_design/NPC_STYLE_GUIDE.md

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+# 🎨 NPC STYLE GUIDE - Clear Facial Features
+
+**Updated:** 30.12.2025 03:58  
+**Key Requirement:** CLEARLY VISIBLE eyes, mouth, facial expressions
+
+---
+
+## ✅ MANDATORY NPC FEATURES
+
+### **FACIAL DETAILS (CRITICAL):**
+- ✅ **Eyes:** Large, clearly defined, expressive
+- ✅ **Eyebrows:** Visible, show emotion
+- ✅ **Mouth:** Clear, detailed, shows expression
+- ✅ **Nose:** Defined (not just dot)
+- ✅ **Face shape:** Clear jawline/cheeks
+- ✅ **Expressions:** Readable from distance
+
+### **STYLE REFERENCE:**
+See uploaded Kai image - THIS level of facial detail!
+
+---
+
+## 📝 UPDATED NPC PROMPT TEMPLATE
+
+### **OLD Prompt (vague):**
+```
+"trader NPC character, merchant with backpack, game NPC sprite"
+```
+
+### **NEW Prompt (detailed facial features):**
+```
+"trader NPC character, merchant with backpack and hat, 
+CLEARLY VISIBLE EYES with pupils and highlights, 
+expressive eyebrows, detailed mouth showing friendly expression, 
+defined nose and facial features, readable emotions,
+full body front view, game character sprite,
+(bold black outlines:1.4), dark hand-drawn stylized indie game asset,
+(gritty noir aesthetic:1.2), flat colors, muted color palette,
+isolated object centered on solid white background"
+```
+
+---
+
+## 🎯 KEY ADDITIONS TO ALL NPC PROMPTS:
+
+**Always include:**
+- "clearly visible eyes with pupils and highlights"
+- "expressive eyebrows"
+- "detailed mouth showing [happy/sad/neutral/angry] expression"
+- "defined facial features readable at game scale"
+- "full body front view" (for consistency)
+
+---
+
+## 👥 NPC EXPRESSION VARIATIONS
+
+### **For each key NPC, generate 3 expressions:**
+
+**Example: Trader NPC**
+1. **trader_neutral.png** - "calm neutral expression"
+2. **trader_happy.png** - "friendly smiling expression"
+3. **trader_surprised.png** - "surprised wide-eyed expression"
+
+**Why:** Dynamic dialogue feels alive!
+
+---
+
+## ✅ QUALITY CHECK
+
+**Good NPC sprite should have:**
+- [ ] Can see eye color/pupils from 3 feet away
+- [ ] Can read emotion (happy/sad/angry)
+- [ ] Mouth clearly visible (not just line)
+- [ ] Face doesn't blend into background
+- [ ] Eyebrows add personality
+- [ ] Overall expression matches character role
+
+---
+
+**Reference:** Kai uploaded image = PERFECT facial detail level! ⭐
+
+---
+
+**Created:** 30.12.2025 03:58  
+**Apply to:** ALL NPC generations moving forward