diff --git a/backend/gateway/platforms/deepview_sse.py b/backend/gateway/platforms/deepview_sse.py
index 0aaf000..0f612a7 100644
--- a/backend/gateway/platforms/deepview_sse.py
+++ b/backend/gateway/platforms/deepview_sse.py
@@ -592,6 +592,9 @@ class DeepviewSSEServer:
             else:
                 systemPrompt += f"\n\n## 通用模式\n企业知识库目录：{orgDir}/wiki/\n平台规则参考：{platformDir}/wiki/\n"
 
+            # 强调输出纪律，从源头杜绝输出底层 JSON 结构给前端
+            systemPrompt += "\n\n【严格输出规范】\n严禁在最终回答中输出任何 JSON 结构、工具调用过程记录、文件读取错误等底层调试信息。你必须将系统结果和发现转化为专业、流畅的文档级 Markdown 给医生阅读！\n"
+
             # 3. 加载上下文履历，实现真正的 Stateful Context
             history = db.get_messages_as_conversation(chatId)
 
diff --git a/src/app/app.css b/src/app/app.css
index 20f8dc4..34c1ee6 100644
--- a/src/app/app.css
+++ b/src/app/app.css
@@ -395,28 +395,44 @@
 .chat-send-btn:disabled { background: #cbd5e1; color: #f1f5f9; }
 /* Markdown in Chat */
 .markdown-body {
-  font-family: inherit;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
   line-height: 1.6;
+  font-size: 15px;
+  color: #1e293b;
+  letter-spacing: 0.01em;
 }
 .markdown-body p {
-  margin-bottom: 8px;
+  margin-bottom: 12px;
 }
 .markdown-body p:last-child {
   margin-bottom: 0;
 }
 .markdown-body strong {
   font-weight: 700;
+  color: #0f172a;
 }
 .markdown-body ul, .markdown-body ol {
-  padding-left: 20px;
-  margin-bottom: 8px;
+  padding-left: 24px;
+  margin-bottom: 12px;
+  margin-top: 4px;
+}
+.markdown-body ul {
+  list-style-type: disc;
+}
+.markdown-body ol {
+  list-style-type: decimal;
 }
 .markdown-body li {
-  margin-bottom: 4px;
+  margin-bottom: 6px;
+  display: list-item;
 }
 .markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
-  margin-top: 12px;
-  margin-bottom: 8px;
+  margin-top: 16px;
+  margin-bottom: 10px;
   font-weight: 700;
-  line-height: 1.4;
+  line-height: 1.3;
+  color: #0f172a;
+}
+.markdown-body h3, .markdown-body h4 {
+  font-size: 16px;
 }
diff --git a/src/app/app.html b/src/app/app.html
index 68d29b1..4005853 100644
--- a/src/app/app.html
+++ b/src/app/app.html
@@ -136,7 +136,7 @@
               
               <!-- AI 头像：方形 -->
               <div class="msg-avatar ai-avatar" *ngIf="msg.role !== 'user'">
-                <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M12 2v20M17 5H9.5a3.5 3.5 0 0 0 0 7h5a3.5 3.5 0 0 1 0 7H6"/></svg>
+                <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M22 12h-4l-3 9L9 3l-3 9H2"/></svg>
               </div>
 
               <div class="msg-bubble markdown-body" [class.streaming]="msg.isStreaming" [innerHTML]="msg.htmlContent || msg.rawContent"></div>
diff --git a/src/app/app.ts b/src/app/app.ts
index 07eb4df..3af5762 100644
--- a/src/app/app.ts
+++ b/src/app/app.ts
@@ -127,7 +127,8 @@ export class App implements OnDestroy, OnInit {
           const currentStreamingMsg = this.chatMessages.find(m => m.isStreaming && m.role === 'agent');
           if (currentStreamingMsg) {
             currentStreamingMsg.rawContent = (currentStreamingMsg.rawContent || '') + payload.text;
-            currentStreamingMsg.htmlContent = marked.parse(currentStreamingMsg.rawContent) as string;
+            const displayStr = this.sanitizeStreamingContent(currentStreamingMsg.rawContent);
+            currentStreamingMsg.htmlContent = marked.parse(displayStr) as string;
           }
           break;
         case 'agent:thinking':
@@ -141,7 +142,11 @@ export class App implements OnDestroy, OnInit {
             activeStreamingMsg.isStreaming = false;
             if (payload.fullAnswer) {
               activeStreamingMsg.rawContent = payload.fullAnswer;
-              activeStreamingMsg.htmlContent = marked.parse(activeStreamingMsg.rawContent || '') as string;
+              const finalStr = this.sanitizeStreamingContent(activeStreamingMsg.rawContent || '');
+              activeStreamingMsg.htmlContent = marked.parse(finalStr) as string;
+            } else {
+              const finalFallbackStr = this.sanitizeStreamingContent(activeStreamingMsg.rawContent || '');
+              activeStreamingMsg.htmlContent = marked.parse(finalFallbackStr) as string;
             }
           }
           break;
@@ -458,7 +463,8 @@ export class App implements OnDestroy, OnInit {
         if (res && res.messages && res.messages.length > 0) {
           this.chatMessages = res.messages.map((m: any) => {
             const rawContent = m.content || '';
-            const htmlContent = marked.parse(rawContent) as string;
+            const displayStr = this.sanitizeStreamingContent(rawContent);
+            const htmlContent = marked.parse(displayStr) as string;
             return {
               role: m.role,
               rawContent: rawContent,
@@ -509,4 +515,16 @@ export class App implements OnDestroy, OnInit {
     }
   }
 
+  private sanitizeStreamingContent(raw: string): string {
+    if (!raw) return '';
+    let text = raw;
+    // Strip markdown JSON block wrappings entirely
+    text = text.replace(/```json\s*\{[\s\S]*?\}\s*```/g, '');
+    // Strip bare unescaped JSON tool reports which match specific sigs
+    text = text.replace(/\{"content":[\s\S]*?\}/g, '');
+    text = text.replace(/\{"total_count":[\s\S]*?\}/g, '');
+    // Strip trailing tool garbage that might be partially yielded
+    return text.trim();
+  }
+
 }