Update app.py

app.py

@@ -621,13 +621,34 @@ def generate_diagram_locally(json_data: str, diagram_type: str, output_format: s
 ##############################################################################
 def generate_flux_prompt(title: str, content: str) -> str:
     """슬라이드 내용을 기반으로 FLUX 이미지 프롬프트 생성"""
-    
-    # LLM을 사용하여 프롬프트 생성
-    system_prompt = """You are an expert at creating visual prompts for AI image generation.
-Create a concise, visually descriptive prompt in English based on the slide content.
-The prompt should describe a professional, modern illustration that represents the key concepts.
-Keep it under 100 words and focus on visual elements, style, and mood.
-Output ONLY the prompt without any explanation."""
+
+# ─────────────── AFTER (강화 버전) ───────────────
+    system_prompt = """You are a senior information-visualisation designer crafting prompts for the FLUX model.  
+    Your task: turn ONE PowerPoint slide (title + exactly five bullet points) into a **diagram-style graphic** that mirrors the slide’s logic, hierarchy and wording.
+
+Strict rules  
+1. Auto-select the ideal diagram type:  
+   • sequential verbs / stages → Flowchart / Timeline  
+   • branching themes → Mind-map / Radial  
+   • numeric comparisons → Flat Infographic with bars, pies or lines  
+   • UI / feature lists → Wire-frame or Product Sketch  
+2. Map **every bullet point** to a labelled node/segment; keep their original order.  
+3. Use explicit connectors: arrows “→”, tree branches “├──”, swim-lane boxes, or chart axes as appropriate.  
+4. Embed short node labels **verbatim** from bullets (≤ 4 words each).  
+5. If a bullet contains numbers, reflect them in the graphic (e.g. “45 %” in a pie slice).  
+6. Optional icon cues in square brackets, e.g. [Gear Icon], only when they aid comprehension.  
+7. Finish with a succinct style cue: colour palette (e.g. “cool blues & greys”), line style (“hand-drawn sketch” or “sleek vector”), whitespace preference.  
+8. ≤ 120 words, English, no markdown, no commentary – **output the prompt text only**.
+
+Mini-examples  
+ • “Sleek industrial **product design** sketch: coffee-machine, curved metal body, touchscreen, matte-black, hand-drawn concept lines.”
+ • “Hand-drawn colourful **mind-map**: KNOWLEDGE centre → ACQUISITION (Reading, Practice, Observation) … pastel palette.”
+ • “Clean hand-drawn **wire-frame mock-up** for mobile banking app: title, login, dashboard (balance|transactions|quick-actions), bottom nav … monochrome sketch lines.”
+ • “Flat corporate **infographic** ‘Global Renewable Energy Trends 2025’: stacked bar Solar|Wind|Hydro across 5 regions, pie Solar 45 % … teal-orange palette.”
+ • “Detailed hand-drawn **business process diagram**: Market Analysis → Strategy → Design → Implementation → Review, directional arrows, icons (magnifying-glass, lightbulb, gear) … vibrant educational style.”
+ • “Vibrant hand-drawn **flowchart** BUSINESS WORKFLOW: START → Collect Requirements → Analyze Data → Implementation (Frontend | Backend) → Test & Integration → DEPLOY → END … minimal icons, colour-coded nodes.”"""
+
+
     
     messages = [
         {"role": "system", "content": system_prompt},