diff --git a/index.html b/index.html
index 185e59b..ce32a67 100644
--- a/index.html
+++ b/index.html
@@ -15,24 +15,24 @@
 .copy-btn{position:absolute;top:.5rem;right:.5rem;background:#0f172a;color:#fff;border-radius:.5rem;padding:.25rem .5rem;font-size:12px;opacity:.85}
 .copy-btn:hover{opacity:1}
 .msg-avatar{font-size:16px}
+.menu-card{position:fixed;z-index:60;min-width:12rem;border-radius:0.75rem;border:1px solid #e5e7eb;background:#fff;box-shadow:0 10px 20px rgba(0,0,0,.08)}
+.menu-item{width:100%;text-align:left;padding:.5rem .75rem;font-size:.875rem;display:flex;align-items:center;gap:.5rem}
+.menu-item:hover{background:#f9fafb}
 </style>
 </head>
 <body class="bg-white text-gray-900 selection:bg-black/10">
 <div class="flex flex-col h-dvh max-h-dvh">
 <header class="sticky top-0 z-20 bg-white/80 backdrop-blur border-b border-gray-200">
   <div class="mx-auto w-full max-w-none px-4 py-3 grid grid-cols-3 items-center">
-    <button id="sidebarBtn" class="h-8 w-8 rounded-xl bg-gray-100 hover:bg-gray-200 active:scale-[.99] transition flex items-center justify-center" title="Assistants"><svg viewBox="0 0 24 24" class="h-5 w-5" fill="none" stroke="currentColor" stroke-width="2"><path stroke-linecap="round" stroke-linejoin="round" d="M4 6h16M4 12h16M4 18h16"/></svg></button>
+    <button id="sidebarBtn" class="h-8 w-8 rounded-xl bg-gray-100 hover:bg-gray-200 active:scale-[.99] transition flex items-center justify-center" title="Assistants"><i data-lucide="panel-left" class="h-5 w-5"></i></button>
     <button id="settingsBtnTop" class="justify-self-center h-8 w-8 rounded-full bg-gray-200 text-gray-900 flex items-center justify-center hover:bg-gray-300 active:scale-[.99] transition" title="Assistant settings">🤖</button>
-    <div></div>
+    <div class="justify-self-end"><button id="historyBtn" class="h-8 w-8 rounded-xl bg-gray-100 hover:bg-gray-200 active:scale-[.99] transition flex items-center justify-center" title="Threads"><i data-lucide="panel-right" class="h-5 w-5"></i></button></div>
   </div>
 </header>
-<main id="chat" class="flex-1 overflow-y-auto no-scrollbar">
-  <div id="messages" class="mx-auto w-full max-w-none py-4 sm:py-6 space-y-4"></div>
-  <div class="h-24"></div>
-</main>
+<main id="chat" class="flex-1 overflow-y-auto no-scrollbar"><div id="messages" class="mx-auto w-full max-w-none px-0 py-4 sm:py-6 space-y-4"></div><div class="h-24"></div></main>
 <footer class="sticky bottom-0 z-10 bg-gradient-to-t from-white via-white/95 to-white/40 pt-3 pb-[calc(12px+var(--safe-bottom))] border-t border-gray-200">
-  <div class="mx-auto w-full max-w-none">
-    <form id="composer" class="group relative flex items-end gap-2">
+  <div class="mx-auto w-full max-w-none px-0">
+    <form id="composer" class="group relative flex items-end gap-2 px-4">
       <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-[14px] 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"><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>
@@ -43,14 +43,28 @@
 <aside id="sidebar" class="fixed inset-y-0 left-0 z-50 w-72 max-w-[85vw] bg-white border-r border-gray-200 shadow-xl transform -translate-x-full transition-transform duration-200 ease-out flex flex-col">
   <div class="p-3 border-b flex items-center gap-2"><button id="newAssistantBtn" class="px-3 py-2 rounded-xl bg-black text-white text-sm hover:bg-black/90">New assistant</button><span class="text-xs text-gray-500">Click name to equip</span></div>
   <div id="assistantList" class="flex-1 overflow-y-auto divide-y"></div>
-  <div class="p-3 border-t">
-    <div class="relative">
-      <button id="userMenuBtn" class="w-full flex items-center justify-between px-3 py-2 rounded-xl bg-gray-100 hover:bg-gray-200 active:scale-[.99] transition"><span class="flex items-center gap-2"><span class="h-6 w-6 rounded-full bg-gray-900 text-white flex items-center justify-center">👤</span><span class="text-sm">Account & Backup</span></span><svg viewBox="0 0 24 24" class="h-4 w-4" fill="none" stroke="currentColor" stroke-width="2"><path stroke-linecap="round" stroke-linejoin="round" d="M6 9l6 6 6-6"/></svg></button>
-      <div id="userMenu" class="absolute left-0 right-0 bottom-12 translate-y-2 rounded-xl border border-gray-200 bg-white shadow-lg hidden"><button id="apiKeyOption" class="w-full text-left px-3 py-2 text-sm hover:bg-gray-50">Enter OpenRouter API key</button><button id="importOption" class="w-full text-left px-3 py-2 text-sm hover:bg-gray-50">Import backup (.json)</button><button id="exportOption" class="w-full text-left px-3 py-2 text-sm hover:bg-gray-50">Export backup (.json)</button></div>
-      <input id="importInput" type="file" accept="application/json,.json" class="hidden"/>
+  <div class="p-3 border-t relative">
+    <button id="userMenuBtn" class="w-full flex items-center justify-between px-3 py-2 rounded-xl bg-gray-100 hover:bg-gray-200 active:scale-[.99] transition"><span class="flex items-center gap-2"><span class="h-6 w-6 rounded-full bg-gray-900 text-white flex items-center justify-center">👤</span><span class="text-sm">Account & Backup</span></span><i data-lucide="chevron-down" class="h-4 w-4"></i></button>
+    <div id="userMenu" class="absolute left-3 right-3 bottom-16 translate-y-2 rounded-xl border border-gray-200 bg-white shadow-lg hidden overflow-hidden">
+      <button id="apiKeyOption" class="menu-item">Enter OpenRouter API key</button>
+      <button id="assistantsImportOption" class="menu-item">Import assistants (.json)</button>
+      <button id="assistantsExportOption" class="menu-item">Export assistants (.json)</button>
+      <button id="threadsImportOption" class="menu-item">Import threads (.json)</button>
+      <button id="threadsExportOption" class="menu-item">Export threads (.json)</button>
     </div>
+    <input id="importInput" type="file" accept="application/json,.json" class="hidden"/>
   </div>
 </aside>
+<div id="historyOverlay" class="fixed inset-0 z-40 bg-black/20 hidden"></div>
+<aside id="historyPanel" class="fixed inset-y-0 right-0 z-50 w-80 max-w-[90vw] bg-white border-l border-gray-200 shadow-xl transform translate-x-full transition-transform duration-200 ease-out flex flex-col">
+  <div class="p-3 border-b text-sm font-medium flex items-center justify-between"><span>Threads</span><button id="closeHistory" class="p-1 rounded hover:bg-gray-100" aria-label="Close"><svg viewBox="0 0 24 24" class="h-5 w-5" fill="none" stroke="currentColor" stroke-width="2"><path stroke-linecap="round" stroke-linejoin="round" d="M6 18L18 6M6 6l12 12"/></svg></button></div>
+  <div id="historyList" class="flex-1 overflow-y-auto divide-y"></div>
+</aside>
+<div id="historyMenu" class="menu-card hidden">
+  <button data-action="pin" class="menu-item"><i data-lucide="pin" class="h-4 w-4"></i><span>Pin to top</span></button>
+  <button data-action="rename" class="menu-item"><i data-lucide="edit-3" class="h-4 w-4"></i><span>Rename</span></button>
+  <button data-action="delete" class="menu-item text-red-600"><i data-lucide="trash-2" class="h-4 w-4"></i><span>Delete</span></button>
+</div>
 <div id="settingsModal" class="hidden fixed inset-0 z-50">
   <div class="absolute inset-0 bg-black/30"></div>
   <div class="absolute inset-x-0 top-12 mx-auto w-full max-w-md px-4">
@@ -82,66 +96,83 @@
     </div>
   </div>
 </div>
+<script src="https://unpkg.com/lucide@latest"></script>
 <script src="https://cdn.jsdelivr.net/npm/markdown-it@13.0.1/dist/markdown-it.min.js"></script>
 <script src="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.9.0/build/highlight.min.js"></script>
 <script>
 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 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','deleteAssistantBtn','sidebar','sidebarOverlay','sidebarBtn','assistantList','newAssistantBtn','userMenuBtn','userMenu','apiKeyOption','assistantsImportOption','assistantsExportOption','threadsImportOption','threadsExportOption','importInput','historyBtn','historyPanel','historyOverlay','historyList','closeHistory','historyMenu'].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 globalStore={get apiKey(){return localStorage.getItem('openrouter_api_key')||DEFAULT_API_KEY||''},set apiKey(v){localStorage.setItem('openrouter_api_key',v||'')}};
 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 def={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:''}};assistants=[def];as.save(assistants);as.setActiveId(def.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 getActive=()=>assistants.find(a=>a.id===as.getActiveId())||assistants[0],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 state={messages:[],busy:false,controller:null,currentThreadId: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 reflectActiveAssistant(){const a=getActive();el.settingsBtnTop.title=`Settings — ${a.name}`;if(window.lucide)lucide.createIcons()}
 function renderSidebar(){const activeId=as.getActiveId();el.assistantList.innerHTML=assistants.map(a=>`<button data-asst-id="${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 enhanceCodeBlocks(root){root.querySelectorAll('pre>code').forEach(code=>{const pre=code.parentElement;pre.classList.add('relative','rounded-xl','border','border-gray-200');if(!pre.querySelector('.copy-btn')){const btn=document.createElement('button');btn.className='copy-btn';btn.textContent='Copy';btn.addEventListener('click',async e=>{e.stopPropagation();try{await navigator.clipboard.writeText(code.innerText);btn.textContent='Copied';setTimeout(()=>btn.textContent='Copy',1200)}catch{}});pre.appendChild(btn)}if(window.hljs&&hljs.highlightElement)hljs.highlightElement(code)});}
+function enhanceCodeBlocks(root){root.querySelectorAll('pre>code').forEach(code=>{const pre=code.parentElement;pre.classList.add('relative','rounded-xl','border','border-gray-200');if(!pre.querySelector('.copy-btn')){const btn=document.createElement('button');btn.className='copy-btn';btn.textContent='Copy';btn.addEventListener('click',async e=>{e.stopPropagation();try{await navigator.clipboard.writeText(code.innerText);btn.textContent='Copied';setTimeout(()=>btn.textContent='Copy',1200)}catch{}});pre.appendChild(btn)}if(window.hljs)hljs.highlightElement(code)});}
 const md=window.markdownit({html:false,linkify:true,typographer:true,breaks:true});
 function renderMarkdown(node,text){node.innerHTML=md.render(text);enhanceCodeBlocks(node)}
-function msgRow(role){const row=document.createElement('div');row.className='flex flex-col gap-2';const head=document.createElement('div');head.className='flex items-center gap-2';const avatar=document.createElement('div');avatar.className=(role==='user'?'bg-gray-900 text-white':'bg-gray-200 text-gray-900')+' msg-avatar shrink-0 h-7 w-7 rounded-full flex items-center justify-center';avatar.textContent=role==='user'?'🧑':'🤖';if(role!=='user')avatar.setAttribute('data-assistant-avatar','');const name=document.createElement('div');name.className='text-xs font-medium text-gray-500';name.textContent=role==='user'?'You':getModelShort();head.appendChild(avatar);head.appendChild(name);const bubble=document.createElement('div');bubble.className=(role==='user'?'bg-gray-50 border border-gray-200':'bg-gray-100')+' msg-bubble markdown-body rounded-2xl px-4 py-3 w-full';row.appendChild(head);row.appendChild(bubble);el.messages.appendChild(row);queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight,behavior:'smooth'}));return bubble}
-function addMessage(role,content){const bubble=msgRow(role);renderMarkdown(bubble,content);state.messages.push({role,content});return bubble}
+function msgRow(role){const row=document.createElement('div');row.className='flex flex-col gap-2';const head=document.createElement('div');head.className='flex items-center gap-2 px-4';const avatar=document.createElement('div');avatar.className=(role==='user'?'bg-gray-900 text-white':'bg-gray-200 text-gray-900')+' msg-avatar shrink-0 h-7 w-7 rounded-full flex items-center justify-center';avatar.textContent=role==='user'?'🧑':'🤖';const name=document.createElement('div');name.className='text-xs font-medium text-gray-500';name.textContent=role==='user'?'You':getModelShort();head.appendChild(avatar);head.appendChild(name);const bubble=document.createElement('div');bubble.className=(role==='user'?'bg-gray-50 border border-gray-200':'bg-gray-100')+' msg-bubble markdown-body rounded-none px-4 py-3 w-full';row.appendChild(head);row.appendChild(bubble);el.messages.appendChild(row);queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight,behavior:'smooth'}));return bubble}
+function addMessage(role,content,track=true){const bubble=msgRow(role);renderMarkdown(bubble,content);if(track)state.messages.push({role,content});return bubble}
 function addAssistantBubbleStreaming(){return msgRow('assistant')}
 function clearChat(){state.messages=[];el.messages.innerHTML=''}
-function updateStatus(){}
 const payloadWithSampling=b=>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='',finished=false;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]'){finished=true;onDelta('',true);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&&!finished){finished=true;onDelta('',true)}}catch{}}}}if(!finished)onDelta('',true);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}}
+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='',finished=false;const doneOnce=()=>{if(finished)return;finished=true;onDelta('',true)};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]'){doneOnce();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)doneOnce()}catch{}}}}doneOnce();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 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();closeHistory();hideHistoryMenu()});
+const idb={db:null,open(){return new Promise((res,rej)=>{const r=indexedDB.open('chat_history_v1',1);r.onupgradeneeded=()=>{r.result.createObjectStore('threads',{keyPath:'id'})};r.onsuccess=()=>{this.db=r.result;res()};r.onerror=()=>rej(r.error)})},all(){return new Promise((res,rej)=>{const tx=this.db.transaction('threads').objectStore('threads').getAll();tx.onsuccess=()=>res(tx.result||[]);tx.onerror=()=>rej(tx.error)})},get(id){return new Promise((res,rej)=>{const tx=this.db.transaction('threads').objectStore('threads').get(id);tx.onsuccess=()=>res(tx.result||null);tx.onerror=()=>rej(tx.error)})},put(v){return new Promise((res,rej)=>{const tx=this.db.transaction('threads','readwrite').objectStore('threads').put(v);tx.onsuccess=()=>res();tx.onerror=()=>rej(tx.error)})},del(id){return new Promise((res,rej)=>{const tx=this.db.transaction('threads','readwrite').objectStore('threads').delete(id);tx.onsuccess=()=>res();tx.onerror=()=>rej(tx.error)})}};
+let threads=[];const titleFrom=t=>(t||'').replace(/\s+/g,' ').trim().slice(0,60)||'Untitled';
+async function ensureThreadOnFirstUser(text){let needNew=!state.currentThreadId;if(state.messages.length===0)state.currentThreadId=null;if(state.currentThreadId){const existing=await idb.get(state.currentThreadId);if(!existing)needNew=true}if(!needNew)return;const id=gid(),now=Date.now();const th={id,title:titleFrom(text),pinned:false,createdAt:now,updatedAt:now,messages:[]};state.currentThreadId=id;threads.unshift(th);await idb.put(th);await renderHistory()}
+async function persistThread(){if(!state.currentThreadId)return;let th=threads.find(x=>x.id===state.currentThreadId)||await idb.get(state.currentThreadId);if(!th)return;th.messages=[...state.messages];th.updatedAt=Date.now();th.title=titleFrom(th.messages.find(m=>m.role==='user')?.content||th.title);await idb.put(th);await renderHistory()}
+function historyRow(t){return `<div class=\"relative flex items-center gap-2 px-3 py-2 ${t.pinned?'bg-yellow-50':''}\"><button data-open-thread=\"${t.id}\" class=\"flex-1 text-left truncate\">${t.pinned?'📌 ':''}${t.title}</button><button data-thread-menu=\"${t.id}\" class=\"h-8 w-8 rounded hover:bg-gray-100 flex items-center justify-center\" title=\"More\"><i data-lucide=\"more-horizontal\" class=\"h-4 w-4\"></i></button></div>`}
+async function renderHistory(){threads=(await idb.all()).sort((a,b)=>(b.pinned-a.pinned)||(b.updatedAt-a.updatedAt));el.historyList.innerHTML=threads.map(historyRow).join('');if(window.lucide)lucide.createIcons()}
+function openHistory(){el.historyPanel.classList.remove('translate-x-full');el.historyOverlay.classList.remove('hidden');renderHistory()}
+function closeHistory(){el.historyPanel.classList.add('translate-x-full');el.historyOverlay.classList.add('hidden')}
+el.historyBtn.addEventListener('click',openHistory);el.historyOverlay.addEventListener('click',closeHistory);el.closeHistory.addEventListener('click',closeHistory);
+let menuThreadId=null;function hideHistoryMenu(){el.historyMenu.classList.add('hidden');menuThreadId=null}
+function showHistoryMenu(btn,id){menuThreadId=id;const r=btn.getBoundingClientRect();el.historyMenu.style.top=(r.bottom+4)+'px';el.historyMenu.style.left=Math.min(window.innerWidth-220,r.right-200)+'px';el.historyMenu.classList.remove('hidden');if(window.lucide)lucide.createIcons()}
+el.historyList.addEventListener('click',async e=>{const openBtn=e.target.closest('[data-open-thread]'),menuBtn=e.target.closest('[data-thread-menu]');if(openBtn){const id=openBtn.getAttribute('data-open-thread'),th=threads.find(t=>t.id===id)||await idb.get(id);if(!th)return;state.currentThreadId=id;clearChat();state.messages=Array.isArray(th.messages)?[...th.messages]:[];for(const m of state.messages){const b=msgRow(m.role);renderMarkdown(b,m.content)}queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight,behavior:'smooth'}));closeHistory();hideHistoryMenu();return}if(menuBtn){e.stopPropagation();showHistoryMenu(menuBtn,menuBtn.getAttribute('data-thread-menu'))}});
+document.addEventListener('click',e=>{if(!el.historyMenu.contains(e.target)&&!e.target.closest('[data-thread-menu]'))hideHistoryMenu();if(!el.userMenu.contains(e.target)&&!el.userMenuBtn.contains(e.target))el.userMenu.classList.add('hidden')});
+el.historyMenu.addEventListener('click',async e=>{const act=e.target.closest('[data-action]')?.getAttribute('data-action');if(!act||!menuThreadId)return;const th=threads.find(t=>t.id===menuThreadId)||await idb.get(menuThreadId);if(!th)return;if(act==='pin'){th.pinned=!th.pinned;await idb.put(th)}else if(act==='rename'){const nv=prompt('Rename to:',th.title);if(nv!=null){th.title=titleFrom(nv);await idb.put(th)}}else if(act==='delete'){if(confirm('Delete this chat?')){await idb.del(th.id);if(state.currentThreadId===th.id){state.currentThreadId=null;clearChat()}}}hideHistoryMenu();renderHistory()});
+el.composer.addEventListener('submit',async e=>{e.preventDefault();if(state.busy)return;const text=el.input.value.trim();if(!text)return;if(state.messages.length===0)state.currentThreadId=null;await ensureThreadOnFirstUser(text);el.input.value='';el.input.style.height='auto';addMessage('user',text);state.busy=true;setBtnStop();const assistantBubble=addAssistantBubbleStreaming();let buf='',completed=false;await askOpenRouterStreaming((delta,done)=>{buf+=delta;renderMarkdown(assistantBubble,buf);if(done&&!completed){completed=true;setBtnSend();state.busy=false;state.messages.push({role:'assistant',content:buf});persistThread();queueMicrotask(()=>el.chat.scrollTo({top:el.chat.scrollHeight,behavior:'smooth'}))}})});
+el.messages.addEventListener('click',e=>{if(e.target.closest('.msg-avatar'))openSidebar()});
+el.input.addEventListener('input',()=>{el.input.style.height='auto';el.input.style.height=Math.min(el.input.scrollHeight,160)+'px'});
 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.settingsBtnTop.addEventListener('click',openSettings);
 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();let buf='';await askOpenRouterStreaming((delta,done)=>{buf+=delta;renderMarkdown(assistantBubble,buf);if(done){setBtnSend();state.busy=false;state.messages.push({role:'assistant',content:buf});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.')}
+el.deleteAssistantBtn.addEventListener('click',()=>{const activeId=as.getActiveId(),active=getActive(),name=active?.name||'this assistant';if(!confirm(`Delete "${name}"?`))return;assistants=assistants.filter(a=>a.id!==activeId);as.save(assistants);if(assistants.length===0){const def=createDefaultAssistant();assistants=[def];as.save(assistants);as.setActiveId(def.id)}else{as.setActiveId(assistants[0].id)}renderSidebar();reflectActiveAssistant();state.currentThreadId=null;clearChat();closeSettings()});
+el.newAssistantBtn.addEventListener('click',()=>{const name=prompt('Name your assistant:');if(!name)return;const id=gid();assistants.unshift({id,name:name.trim(),settings:{model:DEFAULT_MODEL,temperature:1,top_p:1,top_k:0,frequency_penalty:0,presence_penalty:0,repetition_penalty:1,min_p:0,top_a:0,system_prompt:''}});as.save(assistants);as.setActiveId(id);renderSidebar();reflectActiveAssistant();state.currentThreadId=null;clearChat();closeSidebar()});
+el.assistantList.addEventListener('click',e=>{const btn=e.target.closest('[data-asst-id]');if(!btn)return;const id=btn.getAttribute('data-asst-id');if(id){as.setActiveId(id);renderSidebar();reflectActiveAssistant();state.currentThreadId=null;clearChat();closeSidebar()}});
 function toggleUserMenu(show){if(show===true)el.userMenu.classList.remove('hidden');else if(show===false)el.userMenu.classList.add('hidden');else el.userMenu.classList.toggle('hidden')}
 el.userMenuBtn.addEventListener('click',e=>{e.stopPropagation();toggleUserMenu()});
-document.addEventListener('click',e=>{if(!el.userMenu.contains(e.target)&&!el.userMenuBtn.contains(e.target))toggleUserMenu(false)});
-el.apiKeyOption.addEventListener('click',()=>{toggleUserMenu(false);openApiKeyPrompt()});
-el.exportOption.addEventListener('click',()=>{const payload={version:1,activeId:as.getActiveId(),assistants},blob=new Blob([JSON.stringify(payload,null,2)],{type:'application/json'}),url=URL.createObjectURL(blob),a=document.createElement('a'),ts=new Date(),pad=n=>String(n).padStart(2,'0'),fname=`assistants-backup-${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()}
+el.apiKeyOption.addEventListener('click',()=>{toggleUserMenu(false);const cur=store.apiKey?'********':'';const input=prompt('Enter OpenRouter API key (stored locally):',cur);if(input!==null){store.apiKey=input==='********'?store.apiKey:input.trim();alert(store.apiKey?'API key saved locally.':'API key cleared.')}});
+function dl(name,obj){const blob=new Blob([JSON.stringify(obj,null,2)],{type:'application/json'}),url=URL.createObjectURL(blob),a=document.createElement('a');a.href=url;a.download=name;document.body.appendChild(a);a.click();a.remove();URL.revokeObjectURL(url)}
+function ts(){const d=new Date(),p=n=>String(n).padStart(2,'0');return `${d.getFullYear()}${p(d.getMonth()+1)}${p(d.getDate())}-${p(d.getHours())}${p(d.getMinutes())}${p(d.getSeconds())}`}
+let importMode=null;
+el.assistantsExportOption.addEventListener('click',()=>{const payload={version:1,assistants,activeId:as.getActiveId()};dl(`assistants-${ts()}.json`,payload);toggleUserMenu(false)});
+el.assistantsImportOption.addEventListener('click',()=>{importMode='assistants';el.importInput.value='';el.importInput.click()});
+el.threadsExportOption.addEventListener('click',async()=>{const all=await idb.all();dl(`threads-${ts()}.json`,{version:1,threads:all});toggleUserMenu(false)});
+el.threadsImportOption.addEventListener('click',()=>{importMode='threads';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);if(importMode==='assistants'){const list=Array.isArray(data)?data:(Array.isArray(data.assistants)?data.assistants:[]);if(!list.length)throw new Error('No assistants');assistants=list.map(a=>({id:a.id||gid(),name:a.name||'Imported',settings:Object.assign({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:''},a.settings||{})}));as.save(assistants);as.setActiveId(data.activeId&&assistants.some(x=>x.id===data.activeId)?data.activeId:assistants[0]?.id||null);renderSidebar();reflectActiveAssistant();state.currentThreadId=null;clearChat();alert('Assistants imported.')}else if(importMode==='threads'){const arr=Array.isArray(data)?data:(Array.isArray(data.threads)?data.threads:[]);if(!arr.length)throw new Error('No threads');for(const t of arr){const th={id:gid(),title:titleFrom(t.title||titleFrom(t.messages?.find?.(m=>m.role==='user')?.content||'')),pinned:!!t.pinned,createdAt:t.createdAt||Date.now(),updatedAt:t.updatedAt||Date.now(),messages:Array.isArray(t.messages)?t.messages.filter(m=>m&&m.role&&m.content):[]};await idb.put(th)}await renderHistory();alert('Threads imported.')}toggleUserMenu(false)}catch{alert('Import failed')}finally{importMode=null}});
+async function init(){await idb.open();await renderHistory();renderSidebar();reflectActiveAssistant();clearChat();if(window.lucide)lucide.createIcons()}
+window.addEventListener('resize',()=>hideHistoryMenu());
 init()
 </script>
 </body>
