diff --git a/index.html b/index.html
index 2a21ed1..81ad18d 100644
--- a/index.html
+++ b/index.html
@@ -33,16 +33,10 @@
       <div class="mx-auto w-full max-w-2xl px-4">
         <form id="composer" class="group relative flex items-end gap-2">
           <textarea id="input" rows="1" placeholder="Send a message" spellcheck="true" class="flex-1 resize-none rounded-2xl border border-gray-300 bg-white px-4 py-3 text-[15px] leading-6 placeholder:text-gray-400 focus:outline-none focus:ring-2 focus:ring-black/20 focus:border-gray-300 max-h-40"></textarea>
-          <button id="sendBtn" type="submit" aria-label="Send" class="shrink-0 rounded-2xl bg-black text-white h-10 w-10 inline-flex items-center justify-center shadow-sm hover:bg-black/90 active:scale-[.98] transition disabled:opacity-40 disabled:cursor-not-allowed">
+          <button id="sendBtn" type="submit" aria-label="Send" class="shrink-0 rounded-2xl bg-black text-white h-10 w-10 inline-flex items-center justify-center shadow-sm hover:bg-black/90 active:scale-[.98] transition">
             <svg viewBox="0 0 24 24" class="h-5 w-5" fill="none" stroke="currentColor" stroke-width="1.8"><path stroke-linecap="round" stroke-linejoin="round" d="M5 12h14M12 5l7 7-7 7"/></svg>
           </button>
         </form>
-        <div class="mt-2 flex items-center justify-end text-xs text-gray-500">
-          <div class="flex items-center gap-3">
-            <button id="stopBtn" class="underline decoration-dotted hover:text-gray-700 hidden">Stop</button>
-            <button id="clearBtn" class="underline decoration-dotted hover:text-gray-700">Clear</button>
-          </div>
-        </div>
       </div>
     </footer>
   </div>
@@ -86,7 +80,7 @@
           <div id="panelModel" class="p-4 space-y-4">
             <div>
               <label class="block text-gray-700 font-medium mb-1">Model name</label>
-              <input id="set_model" type="text" class="w-full rounded-xl border border-gray-300 px-3 py-2 focus:outline-none focus:ring-2 focus:ring-black/20" placeholder="openai/gpt-4o"/>
+              <input id="set_model" type="text" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="openai/gpt-4o"/>
             </div>
             <div class="grid grid-cols-2 gap-3">
               <div><label class="block text-gray-700 font-medium mb-1">Temperature <span class="text-gray-400">(0–2)</span></label><input id="set_temperature" type="number" min="0" max="2" step="0.1" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="1.0"/><p class="mt-1 text-xs text-gray-500">Variety. Lower = predictable.</p></div>
@@ -121,296 +115,59 @@
     </div>
   </div>
   <script>
-    const DEFAULT_MODEL = 'openai/gpt-4o'
-    const DEFAULT_API_KEY = ''
-    const el = Object.fromEntries([
-      'chat','messages','composer','input','sendBtn','stopBtn','clearBtn','settingsBtnTop',
-      'settingsModal','settingsForm','closeSettings','cancelSettings','tabModel','tabPrompt','panelModel','panelPrompt',
-      'set_model','set_temperature','set_top_p','set_top_k','set_frequency_penalty','set_presence_penalty','set_repetition_penalty','set_min_p','set_top_a','set_system_prompt',
-      'sidebar','sidebarOverlay','sidebarBtn','assistantList','newAssistantBtn','deleteAssistantBtn','userMenuBtn','userMenu','importInput','importOption','exportOption','apiKeyOption'
-    ].map(id => [id, document.getElementById(id)]))
-    const clamp = (v, min, max) => Math.max(min, Math.min(max, v))
-    const num = (v, d) => (v == null || v === '' || isNaN(+v)) ? d : +v
-    const int = (v, d) => (v == null || v === '' || isNaN(parseInt(v))) ? d : parseInt(v)
-    const gid = () => Math.random().toString(36).slice(2,9)
-    const globalStore = {
-      get apiKey(){ return localStorage.getItem('openrouter_api_key') || DEFAULT_API_KEY || '' },
-      set apiKey(v){ localStorage.setItem('openrouter_api_key', v || ''); updateStatus() },
-    }
-    const as = {
-      key: 'assistants_v1',
-      activeKey: 'active_assistant_id',
-      load(){ try{ return JSON.parse(localStorage.getItem(this.key)||'[]') }catch{ return [] } },
-      save(list){ localStorage.setItem(this.key, JSON.stringify(list||[])) },
-      getActiveId(){ return localStorage.getItem(this.activeKey) || null },
-      setActiveId(id){ localStorage.setItem(this.activeKey, id||'') },
-    }
-    let assistants = as.load()
-    if (!assistants.length){
-      const id = gid()
-      assistants = [{ id, name: 'Default', settings: { model: DEFAULT_MODEL, temperature:1, top_p:1, top_k:0, frequency_penalty:0, presence_penalty:0, repetition_penalty:1, min_p:0, top_a:0, system_prompt:'' } }]
-      as.save(assistants)
-      as.setActiveId(id)
-    }
-    const getActive = () => assistants.find(a => a.id === as.getActiveId()) || assistants[0]
-    const setActive = (id) => { as.setActiveId(id); renderSidebar(); reflectActiveAssistant(); clearChat() }
-    const createDefaultAssistant = () => ({ id: gid(), name: 'Default', settings: { model: DEFAULT_MODEL, temperature:1, top_p:1, top_k:0, frequency_penalty:0, presence_penalty:0, repetition_penalty:1, min_p:0, top_a:0, system_prompt:'' } })
-    const store = new Proxy({}, {
-      get(_, prop){
-        if (prop === 'apiKey') return globalStore.apiKey
-        const a = getActive()
-        if (prop === 'model') return a.settings.model
-        if (prop in a.settings) return a.settings[prop]
-        if (prop === 'system_prompt') return a.settings.system_prompt
-        return undefined
-      },
-      set(_, prop, val){
-        if (prop === 'apiKey'){ globalStore.apiKey = val; return true }
-        const idx = assistants.findIndex(a => a.id === getActive().id)
-        if (idx >= 0){
-          if (prop === 'model') assistants[idx].settings.model = val || DEFAULT_MODEL
-          else if (prop === 'system_prompt') assistants[idx].settings.system_prompt = val || ''
-          else assistants[idx].settings[prop] = val
-          as.save(assistants)
-          return true
-        }
-        return false
-      }
-    })
-    const state = { messages: [], busy: false, controller: null }
-    const getModelShort = () => { const m = store.model || ''; return m.includes('/') ? m.split('/').pop() : m }
-    function reflectActiveAssistant(){ const a = getActive(); el.settingsBtnTop.title = `Settings — ${a.name}` }
-    function renderSidebar(){
-      const activeId = as.getActiveId()
-      el.assistantList.innerHTML = assistants.map(a => `
-        <button data-asst-id="${a.id}" class="w-full text-left px-3 py-2 hover:bg-gray-50 flex items-center gap-2 ${a.id===activeId?'bg-gray-100':''}">
-          <span class="h-6 w-6 rounded-full bg-gray-200 flex items-center justify-center">🤖</span>
-          <span class="truncate">${a.name}</span>
-        </button>
-      `).join('')
-    }
-    function addMessage(role, content){
-      const row = document.createElement('div')
-      row.className = 'flex gap-3'
-      const avatar = document.createElement('div')
-      avatar.className = 'cursor-pointer shrink-0 h-8 w-8 rounded-full flex items-center justify-center ' + (role === 'user' ? 'bg-gray-900 text-white' : 'bg-gray-200 text-gray-900')
-      avatar.textContent = role === 'user' ? '🧑' : '🤖'
-      if (role !== 'user') avatar.setAttribute('data-assistant-avatar','')
-      const right = document.createElement('div')
-      right.className = 'flex flex-col'
-      if (role !== 'user'){
-        const name = document.createElement('div')
-        name.className = 'text-xs font-medium text-gray-500 mb-0.5'
-        name.textContent = getModelShort()
-        right.appendChild(name)
-      }
-      const bubble = document.createElement('div')
-      bubble.className = 'rounded-2xl px-4 py-3 text-[15px] leading-relaxed whitespace-pre-wrap ' + (role === 'user' ? 'bg-gray-50 border border-gray-200' : 'bg-gray-100')
-      bubble.textContent = content
-      right.appendChild(bubble)
-      row.appendChild(avatar); row.appendChild(right)
-      el.messages.appendChild(row)
-      state.messages.push({ role, content })
-      queueMicrotask(() => el.chat.scrollTo({ top: el.chat.scrollHeight, behavior: 'smooth' }))
-      return bubble
-    }
-    function addAssistantBubbleStreaming(){
-      const row = document.createElement('div'); row.className = 'flex gap-3'
-      const avatar = document.createElement('div'); avatar.className = 'cursor-pointer shrink-0 h-8 w-8 rounded-full flex items-center justify-center bg-gray-200 text-gray-900'; avatar.textContent='🤖'; avatar.setAttribute('data-assistant-avatar','')
-      const right = document.createElement('div'); right.className='flex flex-col'
-      const name = document.createElement('div'); name.className='text-xs font-medium text-gray-500 mb-0.5'; name.textContent=getModelShort()
-      const bubble = document.createElement('div'); bubble.className='rounded-2xl px-4 py-3 text-[15px] leading-relaxed bg-gray-100 text-gray-800 whitespace-pre-wrap'; bubble.textContent=''
-      right.appendChild(name); right.appendChild(bubble)
-      row.appendChild(avatar); row.appendChild(right)
-      el.messages.appendChild(row)
-      queueMicrotask(() => el.chat.scrollTo({ top: el.chat.scrollHeight }))
-      return bubble
-    }
-    function clearChat(){ state.messages=[]; el.messages.innerHTML='' }
+    const DEFAULT_MODEL='openai/gpt-4o',DEFAULT_API_KEY='';
+    const el=Object.fromEntries(['chat','messages','composer','input','sendBtn','settingsBtnTop','settingsModal','settingsForm','closeSettings','cancelSettings','tabModel','tabPrompt','panelModel','panelPrompt','set_model','set_temperature','set_top_p','set_top_k','set_frequency_penalty','set_presence_penalty','set_repetition_penalty','set_min_p','set_top_a','set_system_prompt','sidebar','sidebarOverlay','sidebarBtn','assistantList','newAssistantBtn','deleteAssistantBtn','userMenuBtn','userMenu','importInput','importOption','exportOption','apiKeyOption'].map(id=>[id,document.getElementById(id)]));
+    const clamp=(v,min,max)=>Math.max(min,Math.min(max,v)),num=(v,d)=>v==null||v===''||isNaN(+v)?d:+v,int=(v,d)=>v==null||v===''||isNaN(parseInt(v))?d:parseInt(v),gid=()=>Math.random().toString(36).slice(2,9);
+    const globalStore={get apiKey(){return localStorage.getItem('openrouter_api_key')||DEFAULT_API_KEY||''},set apiKey(v){localStorage.setItem('openrouter_api_key',v||'');updateStatus()}};
+    const as={key:'assistants_v1',activeKey:'active_assistant_id',load(){try{return JSON.parse(localStorage.getItem(this.key)||'[]')}catch{return[]}},save(list){localStorage.setItem(this.key,JSON.stringify(list||[]))},getActiveId(){return localStorage.getItem(this.activeKey)||null},setActiveId(id){localStorage.setItem(this.activeKey,id||'')}};
+    let assistants=as.load();
+    if(!assistants.length){const id=gid();assistants=[{id,name:'Default',settings:{model:DEFAULT_MODEL,temperature:1,top_p:1,top_k:0,frequency_penalty:0,presence_penalty:0,repetition_penalty:1,min_p:0,top_a:0,system_prompt:''}}];as.save(assistants);as.setActiveId(id)}
+    const getActive=()=>assistants.find(a=>a.id===as.getActiveId())||assistants[0],setActive=id=>{as.setActiveId(id);renderSidebar();reflectActiveAssistant();clearChat()},createDefaultAssistant=()=>({id:gid(),name:'Default',settings:{model:DEFAULT_MODEL,temperature:1,top_p:1,top_k:0,frequency_penalty:0,presence_penalty:0,repetition_penalty:1,min_p:0,top_a:0,system_prompt:''}});
+    const store=new Proxy({},{get(_,p){if(p==='apiKey')return globalStore.apiKey;const a=getActive();if(p==='model')return a.settings.model;if(p in a.settings)return a.settings[p];if(p==='system_prompt')return a.settings.system_prompt},set(_,p,v){if(p==='apiKey'){globalStore.apiKey=v;return true}const i=assistants.findIndex(a=>a.id===getActive().id);if(i>=0){if(p==='model')assistants[i].settings.model=v||DEFAULT_MODEL;else if(p==='system_prompt')assistants[i].settings.system_prompt=v||'';else assistants[i].settings[p]=v;as.save(assistants);return true}return false}});
+    const state={messages:[],busy:false,controller:null};
+    const getModelShort=()=>{const m=store.model||'';return m.includes('/')?m.split('/').pop():m};
+    function reflectActiveAssistant(){const a=getActive();el.settingsBtnTop.title=`Settings — ${a.name}`}
+    function renderSidebar(){const activeId=as.getActiveId();el.assistantList.innerHTML=assistants.map(a=>`<button data-asst-id="${a.id}" class="w-full text-left px-3 py-2 hover:bg-gray-50 flex items-center gap-2 ${a.id===activeId?'bg-gray-100':''}"><span class="h-6 w-6 rounded-full bg-gray-200 flex items-center justify-center">🤖</span><span class="truncate">${a.name}</span></button>`).join('')}
+    function addMessage(role,content){const row=document.createElement('div');row.className='flex gap-3';const avatar=document.createElement('div');avatar.className='cursor-pointer shrink-0 h-8 w-8 rounded-full flex items-center justify-center '+(role==='user'?'bg-gray-900 text-white':'bg-gray-200 text-gray-900');avatar.textContent=role==='user'?'🧑':'🤖';if(role!=='user')avatar.setAttribute('data-assistant-avatar','');const right=document.createElement('div');right.className='flex flex-col';if(role!=='user'){const name=document.createElement('div');name.className='text-xs font-medium text-gray-500 mb-0.5';name.textContent=getModelShort();right.appendChild(name)}const bubble=document.createElement('div');bubble.className='rounded-2xl px-4 py-3 text-[15px] leading-relaxed whitespace-pre-wrap '+(role==='user'?'bg-gray-50 border border-gray-200':'bg-gray-100');bubble.textContent=content;right.appendChild(bubble);row.appendChild(avatar);row.appendChild(right);el.messages.appendChild(row);state.messages.push({role,content});queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight,behavior:'smooth'}));return bubble}
+    function addAssistantBubbleStreaming(){const row=document.createElement('div');row.className='flex gap-3';const avatar=document.createElement('div');avatar.className='cursor-pointer shrink-0 h-8 w-8 rounded-full flex items-center justify-center bg-gray-200 text-gray-900';avatar.textContent='🤖';avatar.setAttribute('data-assistant-avatar','');const right=document.createElement('div');right.className='flex flex-col';const name=document.createElement('div');name.className='text-xs font-medium text-gray-500 mb-0.5';name.textContent=getModelShort();const bubble=document.createElement('div');bubble.className='rounded-2xl px-4 py-3 text-[15px] leading-relaxed bg-gray-100 text-gray-800 whitespace-pre-wrap';bubble.textContent='';right.appendChild(name);right.appendChild(bubble);row.appendChild(avatar);row.appendChild(right);el.messages.appendChild(row);queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight}));return bubble}
+    function clearChat(){state.messages=[];el.messages.innerHTML=''}
     function updateStatus(){}
-    function payloadWithSampling(base){
-      return Object.assign({}, base, {
-        temperature: store.temperature,
-        top_p: store.top_p,
-        top_k: store.top_k,
-        frequency_penalty: store.frequency_penalty,
-        presence_penalty: store.presence_penalty,
-        repetition_penalty: store.repetition_penalty,
-        min_p: store.min_p,
-        top_a: store.top_a,
-      })
-    }
-    async function askOpenRouterStreaming(onDelta){
-      const apiKey = store.apiKey; const model = store.model
-      if (!apiKey){ const text = localDemoReply(state.messages[state.messages.length-1]?.content || ''); onDelta(text,true); return { ok:true, text } }
-      try{
-        state.controller = new AbortController()
-        const msgs = []
-        if (store.system_prompt) msgs.push({ role:'system', content: store.system_prompt })
-        msgs.push(...state.messages.filter(m=>m.role!=='system'))
-        const body = payloadWithSampling({ model, messages: msgs, stream: true })
-        const res = await fetch('https://openrouter.ai/api/v1/chat/completions',{
-          method:'POST', headers:{ 'Content-Type':'application/json','Authorization':'Bearer '+apiKey }, body: JSON.stringify(body), signal: state.controller.signal
-        })
-        if (!res.ok){ const errText = await res.text().catch(()=> ''); throw new Error(errText || ('HTTP '+res.status)) }
-        const reader = res.body.getReader(); const decoder = new TextDecoder('utf-8'); let buffer=''; let full=''
-        while(true){ const { value, done } = await reader.read(); if (done) break; buffer += decoder.decode(value,{stream:true});
-          let idx; while((idx = buffer.indexOf('\n\n')) !== -1){ const chunk = buffer.slice(0,idx).trim(); buffer = buffer.slice(idx+2); if (!chunk) continue; if (chunk.startsWith('data:')){ const data = chunk.slice(5).trim(); if (data==='[DONE]') continue; try{ const json=JSON.parse(data); const delta=json.choices?.[0]?.delta?.content ?? ''; if (delta){ full+=delta; onDelta(delta,false) } const finish=json.choices?.[0]?.finish_reason; if (finish){ onDelta('',true) } }catch{} } }
-        }
-        return { ok:true, text: full }
-      }catch(e){
-        const msg = String(e?.message||e)
-        let hint = 'Request failed.'
-        if (/401|unauthorized/i.test(msg)) hint = 'Unauthorized (check API key).'
-        else if (/429|rate/i.test(msg)) hint = 'Rate limited (slow down or upgrade).'
-        else if (/access|forbidden|403/i.test(msg)) hint = 'Forbidden (model or key scope).'
-        const fallback = `\n\n${hint}\nSwitching to local demo.\n\n` + localDemoReply(state.messages[state.messages.length-1]?.content || '')
-        onDelta(fallback,true)
-        return { ok:false, text: fallback }
-      }finally{ state.controller = null }
-    }
-    function localDemoReply(prompt){
-      const tips = [ 'Tip: open the sidebar → Account & Backup to set your OpenRouter API key.', 'Click 🤖 to change model & sampling.', 'New chats are stateless here—no history is kept.' ]
-      const tip = tips[Math.floor(Math.random()*tips.length)]
-      const mirrored = prompt.split(/\s+/).slice(0,24).join(' ')
-      return `Local demo mode. You said: "${mirrored}"\n\n${tip}`
-    }
-    function openSettings(){
-      const a = getActive(); const s = a.settings
-      el.set_model.value = s.model
-      el.set_temperature.value = s.temperature
-      el.set_top_p.value = s.top_p
-      el.set_top_k.value = s.top_k
-      el.set_frequency_penalty.value = s.frequency_penalty
-      el.set_presence_penalty.value = s.presence_penalty
-      el.set_repetition_penalty.value = s.repetition_penalty
-      el.set_min_p.value = s.min_p
-      el.set_top_a.value = s.top_a
-      el.set_system_prompt.value = s.system_prompt
-      showModelTab()
-      el.settingsModal.classList.remove('hidden')
-    }
-    function closeSettings(){ el.settingsModal.classList.add('hidden') }
-    function showModelTab(){ el.tabModel.classList.add('border-black'); el.tabPrompt.classList.remove('border-black'); el.panelModel.classList.remove('hidden'); el.panelPrompt.classList.add('hidden') }
-    function showPromptTab(){ el.tabPrompt.classList.add('border-black'); el.tabModel.classList.remove('border-black'); el.panelPrompt.classList.remove('hidden'); el.panelModel.classList.add('hidden') }
-    el.closeSettings.addEventListener('click', closeSettings)
-    el.cancelSettings.addEventListener('click', closeSettings)
-    el.settingsModal.addEventListener('click', e => { if (e.target === el.settingsModal || e.target.classList.contains('bg-black/30')) closeSettings() })
-    el.tabModel.addEventListener('click', showModelTab)
-    el.tabPrompt.addEventListener('click', showPromptTab)
-    el.settingsForm.addEventListener('submit', (e) => {
-      e.preventDefault()
-      const a = getActive(); const s = a.settings
-      s.model = (el.set_model.value || DEFAULT_MODEL).trim()
-      s.temperature = clamp(num(el.set_temperature.value,1.0),0,2)
-      s.top_p = clamp(num(el.set_top_p.value,1.0),0,1)
-      s.top_k = Math.max(0, int(el.set_top_k.value,0))
-      s.frequency_penalty = clamp(num(el.set_frequency_penalty.value,0.0),-2,2)
-      s.presence_penalty = clamp(num(el.set_presence_penalty.value,0.0),-2,2)
-      s.repetition_penalty = clamp(num(el.set_repetition_penalty.value,1.0),0,2)
-      s.min_p = clamp(num(el.set_min_p.value,0.0),0,1)
-      s.top_a = clamp(num(el.set_top_a.value,0.0),0,1)
-      s.system_prompt = el.set_system_prompt.value.trim()
-      as.save(assistants)
-      closeSettings()
-      reflectActiveAssistant()
-    })
-    el.deleteAssistantBtn.addEventListener('click', () => {
-      const activeId = as.getActiveId()
-      const active = getActive()
-      const name = active?.name || 'this assistant'
-      if (!confirm(`Delete "${name}"?`)) return
-      assistants = assistants.filter(a => a.id !== activeId)
-      as.save(assistants)
-      if (assistants.length === 0){
-        const def = createDefaultAssistant()
-        assistants = [def]
-        as.save(assistants)
-        as.setActiveId(def.id)
-      }else{
-        as.setActiveId(assistants[0].id)
-      }
-      renderSidebar()
-      reflectActiveAssistant()
-      clearChat()
-      closeSettings()
-    })
-    el.composer.addEventListener('submit', async (e) => {
-      e.preventDefault(); if (state.busy) return; const text = el.input.value.trim(); if (!text) return
-      el.input.value=''; el.input.style.height='auto'; addMessage('user', text)
-      state.busy = true; el.sendBtn.disabled = true; el.stopBtn.classList.remove('hidden')
-      const assistantBubble = addAssistantBubbleStreaming()
-      await askOpenRouterStreaming((delta,done)=>{
-        assistantBubble.textContent += delta
-        if (done){ el.sendBtn.disabled=false; el.stopBtn.classList.add('hidden'); state.busy=false; state.messages.push({ role:'assistant', content: assistantBubble.textContent }); queueMicrotask(()=> el.chat.scrollTo({ top: el.chat.scrollHeight, behavior:'smooth' })) }
-      })
-    })
-    el.stopBtn.addEventListener('click', ()=>{ if (state.controller) state.controller.abort(); el.stopBtn.classList.add('hidden'); el.sendBtn.disabled=false; state.busy=false })
-    el.messages.addEventListener('click', (e) => { const target = e.target.closest('[data-assistant-avatar]'); if (target) openSettings() })
-    el.settingsBtnTop.addEventListener('click', openSettings)
-    el.input.addEventListener('input', () => { el.input.style.height='auto'; el.input.style.height = Math.min(el.input.scrollHeight,160) + 'px' })
-    el.clearBtn.addEventListener('click', () => clearChat())
-    function openApiKeyPrompt(){
-      const currentMasked = store.apiKey ? '********' : ''
-      const input = prompt('Enter OpenRouter API key (stored locally):', currentMasked)
-      if (input === null) return
-      store.apiKey = input === '********' ? store.apiKey : (input.trim())
-      alert(store.apiKey ? 'API key saved locally.' : 'API key cleared.')
-    }
-    function toggleUserMenu(show){ if (show===true){ el.userMenu.classList.remove('hidden') } else if (show===false){ el.userMenu.classList.add('hidden') } else { el.userMenu.classList.toggle('hidden') } }
-    el.userMenuBtn.addEventListener('click', (e)=>{ e.stopPropagation(); toggleUserMenu() })
-    document.addEventListener('click', (e)=>{ if (!el.userMenu.contains(e.target) && !el.userMenuBtn.contains(e.target)) toggleUserMenu(false) })
-    el.apiKeyOption.addEventListener('click', ()=>{ toggleUserMenu(false); openApiKeyPrompt() })
-    el.exportOption.addEventListener('click', ()=>{
-      const payload = { version:1, activeId: as.getActiveId(), assistants }
-      const blob = new Blob([JSON.stringify(payload,null,2)], { type:'application/json' })
-      const url = URL.createObjectURL(blob)
-      const a = document.createElement('a')
-      const ts = new Date()
-      const pad = n=>String(n).padStart(2,'0')
-      const fname = `assistants-backup-${ts.getFullYear()}${pad(ts.getMonth()+1)}${pad(ts.getDate())}-${pad(ts.getHours())}${pad(ts.getMinutes())}${pad(ts.getSeconds())}.json`
-      a.href = url; a.download = fname; document.body.appendChild(a); a.click(); a.remove(); URL.revokeObjectURL(url)
-      toggleUserMenu(false)
-    })
-    el.importOption.addEventListener('click', ()=>{ el.importInput.value=''; el.importInput.click() })
-    el.importInput.addEventListener('change', async ()=>{
-      const file = el.importInput.files?.[0]; if (!file) return
-      try{
-        const text = await file.text()
-        const data = JSON.parse(text)
-        const list = Array.isArray(data) ? data : (Array.isArray(data.assistants) ? data.assistants : null)
-        if (!list) throw new Error('Invalid backup format')
-        assistants = list
-        as.save(assistants)
-        const activeId = data.activeId && assistants.some(a=>a.id===data.activeId) ? data.activeId : (assistants[0]?.id || null)
-        as.setActiveId(activeId)
-        renderSidebar(); reflectActiveAssistant(); clearChat(); toggleUserMenu(false); closeSidebar();
-        alert('Backup imported.')
-      }catch(err){ alert('Import failed: ' + (err?.message||err)) }
-    })
-    function openSidebar(){ el.sidebar.classList.remove('-translate-x-full'); el.sidebarOverlay.classList.remove('hidden') }
-    function closeSidebar(){ el.sidebar.classList.add('-translate-x-full'); el.sidebarOverlay.classList.add('hidden') }
-    el.sidebarBtn.addEventListener('click', openSidebar)
-    el.sidebarOverlay.addEventListener('click', closeSidebar)
-    el.newAssistantBtn.addEventListener('click', () => {
-      const name = prompt('Name your assistant:')
-      if (!name) return
-      const id = gid()
-      assistants.unshift({ id, name: name.trim(), settings: { model: DEFAULT_MODEL, temperature:1, top_p:1, top_k:0, frequency_penalty:0, presence_penalty:0, repetition_penalty:1, min_p:0, top_a:0, system_prompt:'' } })
-      as.save(assistants)
-      setActive(id)
-      renderSidebar()
-      closeSidebar()
-      reflectActiveAssistant()
-    })
-    el.assistantList.addEventListener('click', (e) => {
-      const btn = e.target.closest('[data-asst-id]')
-      if (!btn) return
-      const id = btn.getAttribute('data-asst-id')
-      if (id){ setActive(id); renderSidebar(); closeSidebar(); reflectActiveAssistant() }
-    })
-    function initFromQuery(){ const url = new URL(location.href); const key = url.searchParams.get('key'); const model = url.searchParams.get('model'); if (key) globalStore.apiKey = key; if (model){ const a=getActive(); a.settings.model = model; as.save(assistants)} }
-    function init(){ initFromQuery(); updateStatus(); renderSidebar(); reflectActiveAssistant(); clearChat() }
+    function payloadWithSampling(b){return Object.assign({},b,{temperature:store.temperature,top_p:store.top_p,top_k:store.top_k,frequency_penalty:store.frequency_penalty,presence_penalty:store.presence_penalty,repetition_penalty:store.repetition_penalty,min_p:store.min_p,top_a:store.top_a})}
+    function setBtnStop(){const b=el.sendBtn;b.dataset.mode='stop';b.type='button';b.setAttribute('aria-label','Stop');b.innerHTML='<svg viewBox="0 0 24 24" class="h-5 w-5" fill="currentColor"><rect x="7" y="7" width="10" height="10" rx="1"/></svg>';b.onclick=()=>{if(state.controller)state.controller.abort()}}
+    function setBtnSend(){const b=el.sendBtn;b.dataset.mode='send';b.type='submit';b.setAttribute('aria-label','Send');b.innerHTML='<svg viewBox="0 0 24 24" class="h-5 w-5" fill="none" stroke="currentColor" stroke-width="1.8"><path stroke-linecap="round" stroke-linejoin="round" d="M5 12h14M12 5l7 7-7 7"/></svg>';b.onclick=null}
+    async function askOpenRouterStreaming(onDelta){const apiKey=store.apiKey,model=store.model;if(!apiKey){const text=localDemoReply(state.messages[state.messages.length-1]?.content||'');onDelta(text,true);return {ok:true,text}}try{state.controller=new AbortController();const msgs=[];if(store.system_prompt)msgs.push({role:'system',content:store.system_prompt});msgs.push(...state.messages.filter(m=>m.role!=='system'));const body=payloadWithSampling({model,messages:msgs,stream:true});const res=await fetch('https://openrouter.ai/api/v1/chat/completions',{method:'POST',headers:{'Content-Type':'application/json','Authorization':'Bearer '+apiKey},body:JSON.stringify(body),signal:state.controller.signal});if(!res.ok){const errText=await res.text().catch(()=> '');throw new Error(errText||('HTTP '+res.status))}const reader=res.body.getReader(),decoder=new TextDecoder('utf-8');let buffer='',full='';while(true){const {value,done}=await reader.read();if(done)break;buffer+=decoder.decode(value,{stream:true});let idx;while((idx=buffer.indexOf('\n\n'))!==-1){const chunk=buffer.slice(0,idx).trim();buffer=buffer.slice(idx+2);if(!chunk)continue;if(chunk.startsWith('data:')){const data=chunk.slice(5).trim();if(data==='[DONE]')continue;try{const json=JSON.parse(data);const delta=json.choices?.[0]?.delta?.content??'';if(delta){full+=delta;onDelta(delta,false)}const finish=json.choices?.[0]?.finish_reason;if(finish){onDelta('',true)}}catch{}}}}return {ok:true,text:full}}catch(e){const msg=String(e?.message||e);if(/AbortError/i.test(msg)){onDelta('',true);return {ok:false,text:''}}let hint='Request failed.';if(/401|unauthorized/i.test(msg))hint='Unauthorized (check API key).';else if(/429|rate/i.test(msg))hint='Rate limited (slow down or upgrade).';else if(/access|forbidden|403/i.test(msg))hint='Forbidden (model or key scope).';const fallback=`\n\n${hint}\nSwitching to local demo.\n\n`+localDemoReply(state.messages[state.messages.length-1]?.content||'');onDelta(fallback,true);return {ok:false,text:fallback}}finally{state.controller=null}}
+    function localDemoReply(prompt){const tips=['Tip: open the sidebar → Account & Backup to set your OpenRouter API key.','Click 🤖 to change model & sampling.','New chats are stateless here—no history is kept.'],tip=tips[Math.floor(Math.random()*tips.length)],mirrored=prompt.split(/\s+/).slice(0,24).join(' ');return `Local demo mode. You said: "${mirrored}"\n\n${tip}`}
+    function openSettings(){const a=getActive(),s=a.settings;el.set_model.value=s.model;el.set_temperature.value=s.temperature;el.set_top_p.value=s.top_p;el.set_top_k.value=s.top_k;el.set_frequency_penalty.value=s.frequency_penalty;el.set_presence_penalty.value=s.presence_penalty;el.set_repetition_penalty.value=s.repetition_penalty;el.set_min_p.value=s.min_p;el.set_top_a.value=s.top_a;el.set_system_prompt.value=s.system_prompt;showModelTab();el.settingsModal.classList.remove('hidden')}
+    function closeSettings(){el.settingsModal.classList.add('hidden')}
+    function showModelTab(){el.tabModel.classList.add('border-black');el.tabPrompt.classList.remove('border-black');el.panelModel.classList.remove('hidden');el.panelPrompt.classList.add('hidden')}
+    function showPromptTab(){el.tabPrompt.classList.add('border-black');el.tabModel.classList.remove('border-black');el.panelPrompt.classList.remove('hidden');el.panelModel.classList.add('hidden')}
+    el.closeSettings.addEventListener('click',closeSettings);
+    el.cancelSettings.addEventListener('click',closeSettings);
+    el.settingsModal.addEventListener('click',e=>{if(e.target===el.settingsModal||e.target.classList.contains('bg-black/30'))closeSettings()});
+    el.tabModel.addEventListener('click',showModelTab);
+    el.tabPrompt.addEventListener('click',showPromptTab);
+    el.settingsForm.addEventListener('submit',e=>{e.preventDefault();const a=getActive(),s=a.settings;s.model=(el.set_model.value||DEFAULT_MODEL).trim();s.temperature=clamp(num(el.set_temperature.value,1.0),0,2);s.top_p=clamp(num(el.set_top_p.value,1.0),0,1);s.top_k=Math.max(0,int(el.set_top_k.value,0));s.frequency_penalty=clamp(num(el.set_frequency_penalty.value,0.0),-2,2);s.presence_penalty=clamp(num(el.set_presence_penalty.value,0.0),-2,2);s.repetition_penalty=clamp(num(el.set_repetition_penalty.value,1.0),0,2);s.min_p=clamp(num(el.set_min_p.value,0.0),0,1);s.top_a=clamp(num(el.set_top_a.value,0.0),0,1);s.system_prompt=el.set_system_prompt.value.trim();as.save(assistants);closeSettings();reflectActiveAssistant()});
+    el.deleteAssistantBtn.addEventListener('click',()=>{const activeId=as.getActiveId(),active=getActive(),name=active?.name||'this assistant';if(!confirm(`Delete "${name}"?`))return;assistants=assistants.filter(a=>a.id!==activeId);as.save(assistants);if(assistants.length===0){const def=createDefaultAssistant();assistants=[def];as.save(assistants);as.setActiveId(def.id)}else{as.setActiveId(assistants[0].id)}renderSidebar();reflectActiveAssistant();clearChat();closeSettings()});
+    el.composer.addEventListener('submit',async e=>{e.preventDefault();if(state.busy)return;const text=el.input.value.trim();if(!text)return;el.input.value='';el.input.style.height='auto';addMessage('user',text);state.busy=true;setBtnStop();const assistantBubble=addAssistantBubbleStreaming();await askOpenRouterStreaming((delta,done)=>{assistantBubble.textContent+=delta;if(done){setBtnSend();state.busy=false;state.messages.push({role:'assistant',content:assistantBubble.textContent});queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight,behavior:'smooth'}))}})});
+    el.messages.addEventListener('click',e=>{const t=e.target.closest('[data-assistant-avatar]');if(t)openSettings()});
+    el.settingsBtnTop.addEventListener('click',openSettings);
+    el.input.addEventListener('input',()=>{el.input.style.height='auto';el.input.style.height=Math.min(el.input.scrollHeight,160)+'px'});
+    function openApiKeyPrompt(){const cur=store.apiKey?'********':'';const input=prompt('Enter OpenRouter API key (stored locally):',cur);if(input===null)return;store.apiKey=input==='********'?store.apiKey:input.trim();alert(store.apiKey?'API key saved locally.':'API key cleared.')}
+    function toggleUserMenu(show){if(show===true)el.userMenu.classList.remove('hidden');else if(show===false)el.userMenu.classList.add('hidden');else el.userMenu.classList.toggle('hidden')}
+    el.userMenuBtn.addEventListener('click',e=>{e.stopPropagation();toggleUserMenu()});
+    document.addEventListener('click',e=>{if(!el.userMenu.contains(e.target)&&!el.userMenuBtn.contains(e.target))toggleUserMenu(false)});
+    el.apiKeyOption.addEventListener('click',()=>{toggleUserMenu(false);openApiKeyPrompt()});
+    el.exportOption.addEventListener('click',()=>{const payload={version:1,activeId:as.getActiveId(),assistants},blob=new Blob([JSON.stringify(payload,null,2)],{type:'application/json'}),url=URL.createObjectURL(blob),a=document.createElement('a'),ts=new Date(),pad=n=>String(n).padStart(2,'0'),fname=`assistants-backup-${ts.getFullYear()}${pad(ts.getMonth()+1)}${pad(ts.getDate())}-${pad(ts.getHours())}${pad(ts.getMinutes())}${pad(ts.getSeconds())}.json`;a.href=url;a.download=fname;document.body.appendChild(a);a.click();a.remove();URL.revokeObjectURL(url);toggleUserMenu(false)});
+    el.importOption.addEventListener('click',()=>{el.importInput.value='';el.importInput.click()});
+    el.importInput.addEventListener('change',async()=>{const file=el.importInput.files?.[0];if(!file)return;try{const text=await file.text(),data=JSON.parse(text),list=Array.isArray(data)?data:(Array.isArray(data.assistants)?data.assistants:null);if(!list)throw new Error('Invalid backup format');assistants=list;as.save(assistants);const activeId=data.activeId&&assistants.some(a=>a.id===data.activeId)?data.activeId:(assistants[0]?.id||null);as.setActiveId(activeId);renderSidebar();reflectActiveAssistant();clearChat();toggleUserMenu(false);closeSidebar();alert('Backup imported.')}catch(err){alert('Import failed: '+(err?.message||err))}});
+    function openSidebar(){el.sidebar.classList.remove('-translate-x-full');el.sidebarOverlay.classList.remove('hidden')}
+    function closeSidebar(){el.sidebar.classList.add('-translate-x-full');el.sidebarOverlay.classList.add('hidden')}
+    el.sidebarBtn.addEventListener('click',openSidebar);
+    el.sidebarOverlay.addEventListener('click',closeSidebar);
+    el.newAssistantBtn.addEventListener('click',()=>{const name=prompt('Name your assistant:');if(!name)return;const id=gid();assistants.unshift({id,name:name.trim(),settings:{model:DEFAULT_MODEL,temperature:1,top_p:1,top_k:0,frequency_penalty:0,presence_penalty:0,repetition_penalty:1,min_p:0,top_a:0,system_prompt:''}});as.save(assistants);setActive(id);renderSidebar();closeSidebar();reflectActiveAssistant()});
+    el.assistantList.addEventListener('click',e=>{const btn=e.target.closest('[data-asst-id]');if(!btn)return;const id=btn.getAttribute('data-asst-id');if(id){setActive(id);renderSidebar();closeSidebar();reflectActiveAssistant()}});
+    function initFromQuery(){const url=new URL(location.href),key=url.searchParams.get('key'),model=url.searchParams.get('model');if(key)globalStore.apiKey=key;if(model){const a=getActive();a.settings.model=model;as.save(assistants)}}
+    function init(){initFromQuery();updateStatus();renderSidebar();reflectActiveAssistant();clearChat()}
     init()
   </script>
 </body>