diff --git a/src/server/app.py b/src/server/app.py
index 71b4009..3135149 100644
--- a/src/server/app.py
+++ b/src/server/app.py
@@ -11,16 +11,17 @@ from uuid import uuid4
 from fastapi import FastAPI, HTTPException, Query
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import Response, StreamingResponse
-from langchain_core.messages import AIMessageChunk, ToolMessage, BaseMessage
+from langchain_core.messages import AIMessageChunk, BaseMessage, ToolMessage
 from langgraph.types import Command
 
 from src.config.report_style import ReportStyle
 from src.config.tools import SELECTED_RAG_PROVIDER
 from src.graph.builder import build_graph_with_memory
+from src.llms.llm import get_configured_llm_models
 from src.podcast.graph.builder import build_graph as build_podcast_graph
 from src.ppt.graph.builder import build_graph as build_ppt_graph
-from src.prose.graph.builder import build_graph as build_prose_graph
 from src.prompt_enhancer.graph.builder import build_graph as build_prompt_enhancer_graph
+from src.prose.graph.builder import build_graph as build_prose_graph
 from src.rag.builder import build_retriever
 from src.rag.retriever import Resource
 from src.server.chat_request import (
@@ -31,6 +32,7 @@ from src.server.chat_request import (
     GenerateProseRequest,
     TTSRequest,
 )
+from src.server.config_request import ConfigResponse
 from src.server.mcp_request import MCPServerMetadataRequest, MCPServerMetadataResponse
 from src.server.mcp_utils import load_mcp_tools
 from src.server.rag_request import (
@@ -38,8 +40,6 @@ from src.server.rag_request import (
     RAGResourceRequest,
     RAGResourcesResponse,
 )
-from src.server.config_request import ConfigResponse
-from src.llms.llm import get_configured_llm_models
 from src.tools import VolcengineTTS
 
 logger = logging.getLogger(__name__)
@@ -327,13 +327,9 @@ async def enhance_prompt(request: EnhancePromptRequest):
                     "POPULAR_SCIENCE": ReportStyle.POPULAR_SCIENCE,
                     "NEWS": ReportStyle.NEWS,
                     "SOCIAL_MEDIA": ReportStyle.SOCIAL_MEDIA,
-                    "academic": ReportStyle.ACADEMIC,
-                    "popular_science": ReportStyle.POPULAR_SCIENCE,
-                    "news": ReportStyle.NEWS,
-                    "social_media": ReportStyle.SOCIAL_MEDIA,
                 }
                 report_style = style_mapping.get(
-                    request.report_style, ReportStyle.ACADEMIC
+                    request.report_style.upper(), ReportStyle.ACADEMIC
                 )
             except Exception:
                 # If invalid style, default to ACADEMIC