diff --git a/frontends/stapp.py b/frontends/stapp.py
index ab680160..8fcf4b20 100644
--- a/frontends/stapp.py
+++ b/frontends/stapp.py
@@ -21,6 +21,19 @@ from export_cmd import last_assistant_text, export_to_temp, wrap_for_clipboard
 
 st.set_page_config(page_title="Cowork", layout="wide", initial_sidebar_state="collapsed")
 
+st.markdown("""
+<style>
+[data-testid="stBottom"] {
+    position: fixed !important;
+    bottom: 0 !important;
+    left: 0; right: 0;
+    z-index: 999;
+    background: var(--background-color, #ffffff);
+}
+.stMainBlockContainer { padding-bottom: 7rem !important; }
+</style>
+""", unsafe_allow_html=True)
+
 LANG = os.environ.get('GA_LANG', 'zh')
 if LANG not in ('zh', 'en'): LANG = 'zh'
 I18N = {
@@ -233,20 +246,6 @@ try:
     _embed_html = lambda html, **kw: _st_iframe(html, **{k: max(v, 1) if isinstance(v, int) else v for k, v in kw.items()})
 except (ImportError, AttributeError):
     from streamlit.components.v1 import html as _embed_html  # ≤1.55
-_js_scroll_fix = (
-    "!function(){var p=window.parent;if(p.__sfx2)return;p.__sfx2=1;var d=p.document;"
-    "var pending=0;"
-    "function f(){pending=0;var m=d.querySelector('section.main');if(!m)return;"
-    "var s=m.scrollTop,h=m.scrollHeight;"
-    "m.style.minHeight=h+1+'px';void m.offsetHeight;"
-    "m.style.minHeight='';void m.offsetHeight;"
-    "m.scrollTop=s}"
-    "function schedule(){if(!pending){pending=1;requestAnimationFrame(f)}}"
-    "d.addEventListener('transitionend',function(e){"
-    "e.target.closest&&e.target.closest('details')&&setTimeout(schedule,60)},!0);"
-    "new MutationObserver(function(){setTimeout(schedule,80)})"
-    ".observe(d.body,{subtree:1,attributes:1,attributeFilter:['open']})}()"
-)
 # IME composition fix (macOS only) - prevents Enter from submitting during CJK input
 _js_ime_fix = ("" if os.name == 'nt' else
     "!function(){if(window.parent.__imeFix)return;window.parent.__imeFix=1;"
diff --git a/llmcore.py b/llmcore.py
index aec286af..3f22a78a 100644
--- a/llmcore.py
+++ b/llmcore.py
@@ -1,4 +1,4 @@
-import os, json, re, time, requests, sys, threading, urllib3, base64, importlib, uuid
+import os, json, re, time, requests, sys, threading, urllib3, base64, importlib, uuid, pathlib
 from datetime import datetime
 urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
 _RESP_CACHE_KEY = str(uuid.uuid4())
@@ -386,6 +386,7 @@ def _stream_with_retry(sess, url, headers, payload, parse_fn):
                     if not e.value and not streamed: raise requests.ConnectionError("empty response")
                     return e.value or []
         except (requests.Timeout, requests.ConnectionError) as e:
+            #pathlib.Path(__file__).parent.joinpath('temp','bad_requests.json').write_text(json.dumps({"url":url,"headers":headers,"payload":payload,"err":str(e),"t":time.time()},ensure_ascii=False),encoding='utf-8')
             err = f"!!!Error: {type(e).__name__}"
             if attempt < sess.max_retries:
                 d = _delay(None, attempt)
@@ -534,7 +535,7 @@ class BaseSession:
         self.max_retries = max(0, int(cfg.get('max_retries', 4)))
         self.verify = cfg.get('verify', True)
         self.stream = cfg.get('stream', True)
-        default_ct, default_rt = (5, 30) if self.stream else (10, 240)
+        default_ct, default_rt = (5, 40) if self.stream else (10, 240)
         self.connect_timeout = max(1, int(cfg.get('timeout', default_ct)))
         self.read_timeout = max(5, int(cfg.get('read_timeout', default_rt)))
         def _enum(key, valid):