diff --git a/wwwroot/index.ui b/wwwroot/index.ui
index 00d0484..7252a3b 100644
--- a/wwwroot/index.ui
+++ b/wwwroot/index.ui
@@ -106,20 +106,15 @@
                             "subwidgets": []
                         },
                         {
-                            "widgettype": "VBox",
-                            "id": "uitext_wrapper",
+                            "widgettype": "Form",
+                            "id": "chat_form",
                             "options": {
-                                "width": "100%"
-                            },
-                            "binds": [
-                                {
-                                    "wid": "self",
-                                    "event": "render",
-                                    "actiontype": "script",
-                                    "target": "self",
-                                    "script": "if(!this._built){this._built=true;var c=this.dom_element;var ut=new bricks.UiText({name:'cockpit_input',placeholder:'输入需求或回复 Agent...'});ut.dom_element.style.cssText='width:100%;min-height:44px;max-height:160px;padding:10px 12px;border:1px solid #e2e8f0;border-radius:8px;font-size:14px;font-family:inherit;resize:none;outline:none;box-sizing:border-box;line-height:1.5';c.appendChild(ut.dom_element);ut.handleInput();this._uitext=ut;}"
-                                }
-                            ]
+                                "name": "chat_form",
+                                "padding": "0",
+                                "fields": [
+                                    { "name": "message_text", "uitype": "textarea", "placeholder": "输入需求或回复 Agent...", "rows": 2 }
+                                ]
+                            }
                         },
                         {
                             "widgettype": "HBox",
@@ -147,7 +142,7 @@
                                     "binds": [
                                         {
                                             "wid": "self", "event": "click", "actiontype": "script", "target": "self",
-                                            "script": "var ut=document.getElementsByName('cockpit_input')[0];var msg=ut?ut.value.trim():'';if(!msg){bricks.show_error({title:'提示',message:'请输入内容'});return;}var iter=bricks.getWidgetById('current_iteration_id');var iid=iter?iter.options.value:'';if(!iid){bricks.show_error({title:'提示',message:'请先选择迭代'});return;}var files=[];var bag=document.getElementById('cockpit_file_bag');if(bag){var chips=bag.querySelectorAll('[data-fn]');for(var j=0;j<chips.length;j++)files.push(chips[j].getAttribute('data-fn'));}var body='message_text='+encodeURIComponent(msg)+'&iteration_id='+encodeURIComponent(iid)+'&action=send_message&file_paths='+encodeURIComponent(JSON.stringify(files));fetch('/pipeline-sdlc/api/cockpit_chat.dspy',{method:'POST',headers:{'Content-Type':'application/x-www-form-urlencoded'},body:body}).then(function(r){return r.json()}).then(function(r){if(r.success||r.error){ut.value='';ut.dispatchEvent(new Event('input',{bubbles:true}));if(bag)bag.innerHTML='';var c=bricks.getWidgetById('chat_scroll');if(c)c.render({});}});"
+                                            "script": "var form=bricks.getWidgetById('chat_form');var msg=form?form.getValue('message_text'):'';if(!msg||!msg.trim()){bricks.show_error({title:'提示',message:'请输入内容'});return;}var iter=bricks.getWidgetById('current_iteration_id');var iid=iter?iter.options.value:'';if(!iid){bricks.show_error({title:'提示',message:'请先选择迭代'});return;}var files=[];var bag=document.getElementById('cockpit_file_bag');if(bag){var chips=bag.querySelectorAll('[data-fn]');for(var j=0;j<chips.length;j++)files.push(chips[j].getAttribute('data-fn'));}var body='message_text='+encodeURIComponent(msg)+'&iteration_id='+encodeURIComponent(iid)+'&action=send_message&file_paths='+encodeURIComponent(JSON.stringify(files));fetch('/pipeline-sdlc/api/cockpit_chat.dspy',{method:'POST',headers:{'Content-Type':'application/x-www-form-urlencoded'},body:body}).then(function(r){return r.json()}).then(function(r){if(r.success||r.error){form.setValue('message_text','');if(bag)bag.innerHTML='';var c=bricks.getWidgetById('chat_scroll');if(c)c.render({});}});"
                                         }
                                     ]
                                 }