Upload app.py

app.py

@@ -46,6 +46,21 @@ def inject_custom_css():
                 content: "选择文件";
                 font-size: 14px !important;
             }
+
+            /* 右上角三点菜单：隐藏 Deploy 等无用项，保留设置 */
+            [data-testid="stMainMenu"] { visibility: visible !important; }
+            /* 移动端：侧边栏收起按钮美化 */
+            [data-testid="stSidebarCollapsedControl"] {
+                top: 0.4rem !important;
+                left: 0.3rem !important;
+            }
+            /* 顶部工具栏减少空白 */
+            [data-testid="stHeader"] {
+                height: 2.5rem !important;
+                background: transparent !important;
+            }
+            /* 减少标题上方空白 */
+            .block-container { padding-top: 1.5rem !important; }
         </style>
     """, unsafe_allow_html=True)
 
@@ -1166,9 +1181,9 @@ def _chat_fragment():
     q = st.chat_input("输入问题...", key="chat_input_v3")
 
     with chat_box:
-        welcome_placeholder = st.empty()
         if not st.session_state.messages:
-            welcome_placeholder.markdown(
+            _welcome = st.empty()
+            _welcome.markdown(
                 """
                 <div style="display:flex; align-items:center; justify-content:center; height:420px;">
                     <div style="text-align:center; color:#888;">
@@ -1183,6 +1198,8 @@ def _chat_fragment():
                 """,
                 unsafe_allow_html=True,
             )
+        else:
+            _welcome = None
 
         for m in st.session_state.messages:
             with st.chat_message(m["role"]):
@@ -1191,7 +1208,8 @@ def _chat_fragment():
                     st.caption(m["meta"])
 
         if q:
-            welcome_placeholder.empty()
+            if _welcome is not None:
+                _welcome.empty()
             st.session_state.messages.append({"role": "user", "content": q})
             _save_chat_message(CURRENT_USER, "user", q)
             with st.chat_message("user"):