diff --git a/index.html b/index.html
index 81ad18d..3cb5fe4 100644
--- a/index.html
+++ b/index.html
@@ -2,173 +2,149 @@
 
 <html lang="en">
 <head>
-  <meta charset="utf-8"/>
-  <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover"/>
-  <title>ChatGPT — Mobile Clone (Light)</title>
-  <script src="https://cdn.tailwindcss.com"></script>
-  <style>
-    :root{--safe-bottom:env(safe-area-inset-bottom)}
-    ::-webkit-scrollbar{height:8px;width:8px}
-    ::-webkit-scrollbar-thumb{background:#e5e7eb;border-radius:999px}
-    .no-scrollbar::-webkit-scrollbar{display:none}
-    .no-scrollbar{-ms-overflow-style:none;scrollbar-width:none}
-  </style>
+<meta charset="utf-8"/>
+<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover"/>
+<title>ChatGPT — Mobile Clone (Light)</title>
+<script src="https://cdn.tailwindcss.com"></script>
+<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/github-markdown-css@5.5.1/github-markdown-light.min.css"/>
+<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/highlight.js@11.9.0/styles/github.min.css"/>
+<style>
+:root{--safe-bottom:env(safe-area-inset-bottom)}::-webkit-scrollbar{height:8px;width:8px}::-webkit-scrollbar-thumb{background:#e5e7eb;border-radius:999px}.no-scrollbar::-webkit-scrollbar{display:none}.no-scrollbar{-ms-overflow-style:none;scrollbar-width:none}
+.markdown-body{font-size:14px;line-height:1.6}
+.markdown-body pre{overflow:auto}
+.msg-bubble{overflow-x:auto}
+.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}
+</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-2xl 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="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>
-    </header>
-    <main id="chat" class="flex-1 overflow-y-auto no-scrollbar">
-      <div id="messages" class="mx-auto w-full max-w-2xl px-4 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-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">
-            <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>
-    </footer>
+<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="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>
-  <div id="sidebarOverlay" class="fixed inset-0 z-40 bg-black/20 hidden"></div>
-  <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>
-    </div>
-  </aside>
-  <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">
-      <div class="rounded-2xl bg-white shadow-xl border border-gray-200 overflow-hidden">
-        <div class="px-4 py-3 border-b text-sm font-semibold flex items-center justify-between">
-          <span>Assistant Settings</span>
-          <button id="closeSettings" 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>
-        <form id="settingsForm" class="text-sm">
-          <div class="border-b flex text-sm font-medium">
-            <button type="button" id="tabModel" class="flex-1 py-2 px-3 text-center border-b-2 border-black">Model & Sampling</button>
-            <button type="button" id="tabPrompt" class="flex-1 py-2 px-3 text-center border-b-2 border-transparent hover:border-gray-300">System Prompt</button>
-          </div>
-          <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" 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>
-              <div><label class="block text-gray-700 font-medium mb-1">Top P <span class="text-gray-400">(0–1)</span></label><input id="set_top_p" type="number" min="0" max="1" step="0.01" 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">Nucleus sampling.</p></div>
-              <div><label class="block text-gray-700 font-medium mb-1">Top K</label><input id="set_top_k" type="number" min="0" step="1" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="0"/><p class="mt-1 text-xs text-gray-500">Token shortlist size.</p></div>
-              <div><label class="block text-gray-700 font-medium mb-1">Frequency Penalty <span class="text-gray-400">(-2–2)</span></label><input id="set_frequency_penalty" type="number" min="-2" max="2" step="0.1" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="0.0"/><p class="mt-1 text-xs text-gray-500">Discourage repeats by count.</p></div>
-              <div><label class="block text-gray-700 font-medium mb-1">Presence Penalty <span class="text-gray-400">(-2–2)</span></label><input id="set_presence_penalty" type="number" min="-2" max="2" step="0.1" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="0.0"/><p class="mt-1 text-xs text-gray-500">Discourage seen tokens.</p></div>
-              <div><label class="block text-gray-700 font-medium mb-1">Repetition Penalty <span class="text-gray-400">(0–2)</span></label><input id="set_repetition_penalty" 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">Reduce verbatim echoes.</p></div>
-              <div><label class="block text-gray-700 font-medium mb-1">Min P <span class="text-gray-400">(0–1)</span></label><input id="set_min_p" type="number" min="0" max="1" step="0.01" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="0.0"/><p class="mt-1 text-xs text-gray-500">Minimum token prob vs best.</p></div>
-              <div><label class="block text-gray-700 font-medium mb-1">Top A <span class="text-gray-400">(0–1)</span></label><input id="set_top_a" type="number" min="0" max="1" step="0.01" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="0.0"/><p class="mt-1 text-xs text-gray-500">Adaptive nucleus filter.</p></div>
-            </div>
-          </div>
-          <div id="panelPrompt" class="p-4 space-y-4 hidden">
-            <div>
-              <label class="block text-gray-700 font-medium mb-1">System Prompt</label>
-              <textarea id="set_system_prompt" rows="8" class="w-full rounded-xl border border-gray-300 px-3 py-2 focus:outline-none focus:ring-2 focus:ring-black/20" placeholder="Enter a system prompt to guide the assistant"></textarea>
-              <p class="mt-1 text-xs text-gray-500">Saved per assistant.</p>
-            </div>
-          </div>
-          <div class="flex items-center justify-between gap-2 px-4 py-3 border-t">
-            <button type="button" id="deleteAssistantBtn" class="inline-flex items-center gap-2 px-3 py-2 rounded-xl border border-red-200 text-red-700 hover:bg-red-50">
-              <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="M3 6h18M8 6v12a2 2 0 0 0 2 2h4a2 2 0 0 0 2-2V6m-9 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"/></svg>
-              <span>Delete assistant</span>
-            </button>
-            <div class="flex items-center justify-end gap-2">
-              <button type="button" id="cancelSettings" class="px-3 py-2 rounded-xl border bg-white hover:bg-gray-50">Cancel</button>
-              <button type="submit" class="px-3 py-2 rounded-xl bg-black text-white hover:bg-black/90">Save</button>
-            </div>
-          </div>
-        </form>
-      </div>
+</header>
+<main id="chat" class="flex-1 overflow-y-auto no-scrollbar">
+  <div id="messages" class="mx-auto w-full max-w-none px-4 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 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-[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>
+  </div>
+</footer>
+</div>
+<div id="sidebarOverlay" class="fixed inset-0 z-40 bg-black/20 hidden"></div>
+<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>
   </div>
-  <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 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(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>
+</aside>
+<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">
+    <div class="rounded-2xl bg-white shadow-xl border border-gray-200 overflow-hidden">
+      <div class="px-4 py-3 border-b text-sm font-semibold flex items-center justify-between"><span>Assistant Settings</span><button id="closeSettings" 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>
+      <form id="settingsForm" class="text-sm">
+        <div class="border-b flex text-sm font-medium"><button type="button" id="tabModel" class="flex-1 py-2 px-3 text-center border-b-2 border-black">Model & Sampling</button><button type="button" id="tabPrompt" class="flex-1 py-2 px-3 text-center border-b-2 border-transparent hover:border-gray-300">System Prompt</button></div>
+        <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" 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>
+            <div><label class="block text-gray-700 font-medium mb-1">Top P <span class="text-gray-400">(0–1)</span></label><input id="set_top_p" type="number" min="0" max="1" step="0.01" 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">Nucleus sampling.</p></div>
+            <div><label class="block text-gray-700 font-medium mb-1">Top K</label><input id="set_top_k" type="number" min="0" step="1" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="0"/><p class="mt-1 text-xs text-gray-500">Token shortlist size.</p></div>
+            <div><label class="block text-gray-700 font-medium mb-1">Frequency Penalty <span class="text-gray-400">(-2–2)</span></label><input id="set_frequency_penalty" type="number" min="-2" max="2" step="0.1" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="0.0"/><p class="mt-1 text-xs text-gray-500">Discourage repeats by count.</p></div>
+            <div><label class="block text-gray-700 font-medium mb-1">Presence Penalty <span class="text-gray-400">(-2–2)</span></label><input id="set_presence_penalty" type="number" min="-2" max="2" step="0.1" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="0.0"/><p class="mt-1 text-xs text-gray-500">Discourage seen tokens.</p></div>
+            <div><label class="block text-gray-700 font-medium mb-1">Repetition Penalty <span class="text-gray-400">(0–2)</span></label><input id="set_repetition_penalty" 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">Reduce verbatim echoes.</p></div>
+            <div><label class="block text-gray-700 font-medium mb-1">Min P <span class="text-gray-400">(0–1)</span></label><input id="set_min_p" type="number" min="0" max="1" step="0.01" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="0.0"/><p class="mt-1 text-xs text-gray-500">Minimum token prob vs best.</p></div>
+            <div><label class="block text-gray-700 font-medium mb-1">Top A <span class="text-gray-400">(0–1)</span></label><input id="set_top_a" type="number" min="0" max="1" step="0.01" class="w-full rounded-xl border border-gray-300 px-3 py-2" placeholder="0.0"/><p class="mt-1 text-xs text-gray-500">Adaptive nucleus filter.</p></div>
+          </div>
+        </div>
+        <div id="panelPrompt" class="p-4 space-y-4 hidden">
+          <div><label class="block text-gray-700 font-medium mb-1">System Prompt</label><textarea id="set_system_prompt" rows="8" class="w-full rounded-xl border border-gray-300 px-3 py-2 focus:outline-none focus:ring-2 focus:ring-black/20" placeholder="Enter a system prompt to guide the assistant"></textarea><p class="mt-1 text-xs text-gray-500">Saved per assistant.</p></div>
+        </div>
+        <div class="flex items-center justify-between gap-2 px-4 py-3 border-t">
+          <button type="button" id="deleteAssistantBtn" class="inline-flex items-center gap-2 px-3 py-2 rounded-xl border border-red-200 text-red-700 hover:bg-red-50"><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="M3 6h18M8 6v12a2 2 0 0 0 2 2h4a2 2 0 0 0 2-2V6m-9 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"/></svg><span>Delete assistant</span></button>
+          <div class="flex items-center justify-end gap-2"><button type="button" id="cancelSettings" class="px-3 py-2 rounded-xl border bg-white hover:bg-gray-50">Cancel</button><button type="submit" class="px-3 py-2 rounded-xl bg-black text-white hover:bg-black/90">Save</button></div>
+        </div>
+      </form>
+    </div>
+  </div>
+</div>
+<script src="https://cdn.jsdelivr.net/npm/markdown-it@13.0.1/dist/markdown-it.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/highlight.js@11.9.0/lib/common.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 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 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 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 enhanceCodeBlocks(root){root.querySelectorAll('pre>code').forEach(code=>{const pre=code.parentElement;pre.classList.add('relative','rounded-xl','border','border-gray-200');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);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 addAssistantBubbleStreaming(){return msgRow('assistant')}
+function clearChat(){state.messages=[];el.messages.innerHTML=''}
+function updateStatus(){}
+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='';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();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.')}
+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>
 </html>
