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Shirpi commited on Dec 20, 2025

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4687026

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1 Parent(s): 65c49d7

Update app.py

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Files changed (1) hide show

app.py +483 -89

app.py CHANGED Viewed

@@ -9,11 +9,16 @@ from PIL import Image
 from flask import Flask, request, jsonify, render_template_string, Response
 import google.generativeai as genai
 warnings.filterwarnings("ignore")
 keys_string = os.environ.get("API_KEYS", "")
 API_KEYS = [k.strip() for k in keys_string.replace(',', ' ').replace('\n', ' ').split() if k.strip()]
 DB_FILE = "chat_db.json"
 def load_db():
     try:
@@ -30,6 +35,7 @@ user_db = load_db()
 current_key_index = 0
 app = Flask(__name__)
 SYSTEM_INSTRUCTION = """
 ROLE: You are "Student's AI", a professional academic tutor.
 RULES:
@@ -40,6 +46,7 @@ RULES:
 5. **CODE:** Use Python/Java/C++ blocks. Explain logic briefly.
 """
 def get_working_model(key):
     try:
         genai.configure(api_key=key)
@@ -80,12 +87,15 @@ def generate_with_retry(prompt, image_data=None, file_text=None, history_message
     for i in range(len(API_KEYS)):
         key = API_KEYS[current_key_index]
         model_name = get_working_model(key)
         if not model_name:
             current_key_index = (current_key_index + 1) % len(API_KEYS)
             continue
         try:
             genai.configure(api_key=key)
             model = genai.GenerativeModel(model_name=model_name, system_instruction=SYSTEM_INSTRUCTION)
             if image_data or file_text:
                 response = model.generate_content(current_parts)
             else:
@@ -95,21 +105,25 @@ def generate_with_retry(prompt, image_data=None, file_text=None, history_message
         except Exception as e:
             current_key_index = (current_key_index + 1) % len(API_KEYS)
             time.sleep(1)
     return "⚠️ System Busy. Please try again."
 HTML_TEMPLATE = """
 <!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
     <meta name="mobile-web-app-capable" content="yes">
     <meta name="apple-mobile-web-app-capable" content="yes">
     <meta name="theme-color" content="#09090b">
     <link rel="manifest" href="/manifest.json">
     <title>Student's AI</title>
     <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css" rel="stylesheet">
     <link href="https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;700&family=JetBrains+Mono:wght@400;500&display=swap" rel="stylesheet">
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/atom-one-dark.min.css">
     <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
     <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
@@ -120,80 +134,173 @@ HTML_TEMPLATE = """
       mermaid.initialize({ startOnLoad: false, theme: 'dark', securityLevel: 'loose' });
       window.mermaid = mermaid;
     </script>
     <style>
-        :root { --bg: #09090b; --card: #18181b; --user-msg: #27272a; --text: #e4e4e7; --accent: #fff; --border: #27272a; --dim: #71717a; }
         * { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
-        body, html { margin: 0; padding: 0; height: 100dvh; width: 100%; background: var(--bg); color: var(--text); font-family: 'Outfit', sans-serif; overflow: hidden; font-size: 17px; user-select: none; -webkit-user-select: none; }
-        textarea, input { user-select: text !important; -webkit-user-select: text !important; }
-        #app-container { display: flex; flex-direction: column; height: 100dvh; width: 100%; position: relative; overflow-x: hidden; }
-        header { height: 70px; padding: 0 20px; background: rgba(9,9,11, 0.98); border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; flex-shrink: 0; z-index: 50; padding-top: env(safe-area-inset-top); }
-        .menu-btn { width: 40px; height: 40px; border-radius: 50%; border: 1px solid #333; display: flex; align-items: center; justify-content: center; cursor: pointer; color: #fff; }
-        .app-title { font-size: 24px; font-weight: 800; color: #fff; }
-        #sidebar { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: var(--bg); z-index: 100; display: flex; flex-direction: column; padding: 25px; padding-top: calc(70px + env(safe-area-inset-top)); transform: translateY(-100%); transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1); overflow-y: auto; }
         #sidebar.open { transform: translateY(0); }
-        @media (min-width: 768px) { #sidebar { width: 350px; border-right: 1px solid var(--border); } .input-container { max-width: 800px; } #chat-box { padding: 20px 15%; } }
         .user-info { margin-bottom: 30px; font-size: 20px; font-weight: 700; color: #fff; display: flex; align-items: center; gap: 15px; flex-shrink: 0; }
-        .new-chat-btn { width: 100%; padding: 15px; background: #fff; color: #000; border: none; border-radius: 12px; font-weight: 700; font-size: 16px; cursor: pointer; margin-bottom: 25px; flex-shrink: 0; }
-        .history-label { color: var(--dim); font-size: 13px; font-weight: 600; margin-bottom: 10px; text-transform: uppercase; flex-shrink: 0; }
         #history-list { flex: 1; overflow-y: auto; padding: 10px 0; min-height: 100px; }
-        .history-item { display: flex; justify-content: space-between; align-items: center; padding: 15px; margin-bottom: 12px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; cursor: pointer; color: #a1a1aa; font-size: 15px; transition: 0.2s; }
-        .history-item:active { background: #222; color: #fff; }
         .h-title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 200px; flex: 1; margin-right: 10px; }
         .h-actions { display: none; gap: 15px; }
         .history-item.active-mode .h-actions { display: flex; }
-        .rename-input { background: transparent; border: none; border-bottom: 1px solid #fff; color: #fff; font-family: 'Outfit', sans-serif; font-size: 15px; width: 100%; outline: none; padding: 0; }
         .brand-section { text-align: center; margin-top: 20px; padding-bottom: env(safe-area-inset-bottom); flex-shrink: 0; }
-        .brand-name { font-weight: 600; font-size: 12px; color: var(--dim); letter-spacing: 2px; margin-bottom: 10px; }
         .logout-btn { color: #ef4444; cursor: pointer; font-size: 15px; font-weight: 600; padding: 10px; }
-        #chat-box { flex: 1; overflow-y: auto; padding: 20px 5%; padding-bottom: 80px; display: flex; flex-direction: column; gap: 25px; -webkit-overflow-scrolling: touch; }
-        /* INTRO CONTAINER FIX */
         #intro-container {
-            height: 100%;
-            width: 100%;
-            display: flex;
-            flex-direction: column;
-            justify-content: center;
-            align-items: center;
             text-align: center;
         }
         .msg { width: 100%; line-height: 1.7; font-size: 17px; opacity: 0; animation: fadeInstant 0.3s forwards; display: flex; flex-direction: column; }
         @keyframes fadeInstant { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
         .user-msg { align-items: flex-end; }
         .user-content { display: inline-block; width: fit-content; max-width: 85%; background: var(--user-msg); padding: 10px 16px; border-radius: 18px 18px 4px 18px; text-align: left; color: #fff; word-wrap: break-word; }
         .ai-msg { align-items: flex-start; }
         .ai-content { width: 100%; color: #d4d4d8; word-wrap: break-word; }
-        .ai-content strong { color: #fff; }
-        .ai-content h1, .ai-content h2 { margin-top: 20px; color: #fff; }
-        .msg-actions { margin-top: 10px; opacity: 0; transition: opacity 0.2s; display: flex; gap: 20px; }
         .msg:hover .msg-actions { opacity: 1; }
-        .action-icon { cursor: pointer; color: var(--dim); font-size: 18px; }
         .input-wrapper { background: var(--bg); padding: 15px; border-top: 1px solid var(--border); flex-shrink: 0; z-index: 60; padding-bottom: max(15px, env(safe-area-inset-bottom)); }
         .input-container { max-width: 900px; margin: 0 auto; background: var(--card); border: 1px solid var(--border); border-radius: 24px; padding: 8px 12px; display: flex; align-items: flex-end; gap: 12px; }
         textarea { flex: 1; background: transparent; border: none; color: #fff; font-size: 17px; max-height: 120px; padding: 10px 5px; resize: none; outline: none; font-family: 'Outfit', sans-serif; }
-        .icon-btn, .send-btn { width: 38px; height: 38px; display: flex; align-items: center; justify-content: center; border-radius: 50%; border: none; cursor: pointer; font-size: 18px; }
-        .icon-btn { background: transparent; color: #a1a1aa; }
-        .send-btn { background: #fff; color: #000; }
         #preview-area { position: absolute; bottom: 85px; left: 20px; display: none; z-index: 70; }
-        .preview-box { width: 60px; height: 60px; border-radius: 12px; border: 2px solid #fff; background: #222; overflow: hidden; position: relative; }
         .preview-img { width: 100%; height: 100%; object-fit: cover; }
-        .remove-preview { position: absolute; top: -8px; right: -8px; background: red; color: white; border-radius: 50%; width: 20px; height: 20px; font-size: 12px; cursor: pointer; border: none; }
-        /* KEYBOARD STABLE LOGIN */
-        #login-overlay { position: fixed; inset: 0; background: #000; z-index: 2000; display: flex; align-items: flex-start; justify-content: center; padding-top: 25vh; transition: opacity 0.8s ease; opacity: 1; pointer-events: auto; }
         #login-overlay.hidden { opacity: 0; pointer-events: none; }
-        .login-box { width: 90%; max-width: 350px; text-align: center; padding: 40px; border: 1px solid var(--border); border-radius: 20px; background: #0a0a0a; margin: 0 auto; }
         #image-modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.9); z-index: 3000; display: none; align-items: center; justify-content: center; opacity: 0; transition: opacity 0.3s; }
-        #image-modal img { max-width: 95%; max-height: 90%; border-radius: 8px; }
         #image-modal.active { opacity: 1; }
     </style>
 </head>
 <body>
     <div id="login-overlay">
         <div class="login-box">
             <h1 class="app-title" style="margin-bottom:10px;">Student's AI</h1>
@@ -201,7 +308,11 @@ HTML_TEMPLATE = """
             <button onclick="handleLogin()" style="width:100%; padding:15px; border-radius:12px; border:none; background:#fff; font-weight:800; cursor:pointer; font-size: 16px;">Start Learning</button>
         </div>
     </div>
-    <div id="image-modal" onclick="closeImagePreview()"><img id="modal-img" src=""></div>
     <div id="sidebar">
         <div style="display:flex; justify-content:space-between; align-items:center; margin-bottom:20px; flex-shrink:0;">
             <div class="user-info"><span id="display-name">User</span></div>
@@ -215,89 +326,360 @@ HTML_TEMPLATE = """
             <div class="logout-btn" onclick="handleLogout()">Log Out</div>
         </div>
     </div>
     <div id="app-container">
         <header>
             <div class="menu-btn" onclick="toggleSidebar()"><i class="fas fa-bars"></i></div>
             <span class="app-title">Student's AI</span>
             <div style="width:40px;"></div>
         </header>
         <div id="chat-box"></div>
         <div class="input-wrapper">
             <div id="preview-area">
                 <div class="preview-box"><div id="preview-visual"></div></div>
                 <button class="remove-preview" onclick="clearAttachment()">×</button>
             </div>
             <div class="input-container">
                 <button class="icon-btn" onclick="document.getElementById('file-input').click()"><i class="fas fa-paperclip"></i></button>
                 <input type="file" id="file-input" accept="image/*,.txt,.py,.js,.html,.css,.md,.csv,.json" hidden onchange="handleFileSelect(this)">
                 <button class="icon-btn" onclick="document.getElementById('camera-input').click()"><i class="fas fa-camera"></i></button>
                 <input type="file" id="camera-input" accept="image/*" capture="environment" hidden onchange="handleFileSelect(this)">
                 <textarea id="input" placeholder="Type a message..." rows="1" oninput="resizeInput(this)"></textarea>
                 <button class="send-btn" onclick="send()"><i class="fas fa-arrow-up"></i></button>
             </div>
         </div>
     </div>
     <script>
-        let currentUser = null; let currentChatId = null; let currentAttachment = { type: null, data: null, name: null }; let longPressTimer;
-        // FIXED INTRO HTML: CENTERED CONTAINER
-        function getIntroHtml(name) {
-            return `<div id="intro-container"><div class="msg ai-msg"><div class="ai-content"><h1>Hi ${name},</h1><p>Ready to master your studies today?</p></div></div></div>`;
         }
-        function checkLogin() { try { const stored = localStorage.getItem("student_ai_user"); if (stored) { currentUser = stored; document.getElementById("login-overlay").classList.add('hidden'); showApp(); } } catch(e) {} }
-        function handleLogin() { const input = document.getElementById("username-input"); const name = input.value.trim(); if(name) { try { localStorage.setItem("student_ai_user", name); } catch(e){} currentUser = name; document.getElementById("login-overlay").classList.add('hidden'); showApp(); } else { input.style.border = "1px solid red"; setTimeout(() => input.style.border = "1px solid #333", 2000); } }
-        function handleLogout() { try { localStorage.removeItem("student_ai_user"); } catch(e){} document.getElementById("login-overlay").classList.remove('hidden'); document.getElementById('sidebar').classList.remove('open'); setTimeout(() => { document.getElementById('chat-box').innerHTML = ""; currentChatId = null; document.getElementById("username-input").value = ""; }, 300); }
-        function showApp() { document.getElementById("display-name").innerText = "Hi " + currentUser; loadHistory(); if(!currentChatId) { const box = document.getElementById("chat-box"); if(box.innerHTML === "") { box.innerHTML = getIntroHtml(currentUser); } } }
-        function resizeInput(el) { el.style.height = 'auto'; el.style.height = Math.min(el.scrollHeight, 150) + 'px'; }
-        function handleFileSelect(input) { if (input.files && input.files[0]) { const file = input.files[0]; const reader = new FileReader(); reader.onload = function(e) { const result = e.target.result; const isImage = file.type.startsWith('image/'); currentAttachment = { type: isImage ? 'image' : 'file', data: isImage ? result : atob(result.split(',')[1]), name: file.name }; document.getElementById('preview-area').style.display = 'block'; document.getElementById('preview-visual').innerHTML = isImage ? `<img src="${result}" class="preview-img">` : `<div style="display:flex;justify-content:center;align-items:center;height:100%;color:#fff;"><i class="fas fa-file"></i></div>`; }; reader.readAsDataURL(file); } input.value = ""; }
-        function clearAttachment() { currentAttachment = { type: null, data: null, name: null }; document.getElementById('preview-area').style.display = 'none'; }
-        function scrollToBottom() { const box = document.getElementById('chat-box'); setTimeout(() => { box.scrollTo({ top: box.scrollHeight, behavior: 'smooth' }); }, 100); }
-        async function send() {
-            const input = document.getElementById('input'); const text = input.value.trim();
-            if (!text && !currentAttachment.data) return;
-            // REMOVE INTRO IF EXISTS
-            const intro = document.getElementById('intro-container');
-            if(intro) intro.remove();
-            const chatBox = document.getElementById('chat-box');
-            let attachHtml = ''; if (currentAttachment.type === 'image') attachHtml = `<br><img src="${currentAttachment.data}" style="max-height:100px; margin-top:10px; border-radius:8px;">`; if (currentAttachment.type === 'file') attachHtml = `<br><small>📄 ${currentAttachment.name}</small>`;
-            const userHtml = `<div class="msg user-msg"><div class="user-content">${text.replace(/</g, "&lt;")}${attachHtml}</div><div class="msg-actions"><i class="fas fa-copy action-icon" onclick="copyText('${text}')"></i><i class="fas fa-pen action-icon" onclick="editMessage('${text}')"></i></div></div>`;
-            chatBox.insertAdjacentHTML('beforeend', userHtml);
-            const promptText = text; const imgData = currentAttachment.type === 'image' ? currentAttachment.data : null; const fileText = currentAttachment.type === 'file' ? currentAttachment.data : null;
-            input.value = ''; input.style.height = 'auto'; clearAttachment(); scrollToBottom();
-            const msgId = "ai-" + Date.now(); chatBox.insertAdjacentHTML('beforeend', `<div id="${msgId}" class="msg ai-msg"><i class="fas fa-circle-notch fa-spin"></i></div>`); scrollToBottom();
-            try {
-                if (!currentChatId) { const r = await fetch('/new_chat', {method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify({username:currentUser})}); const d = await r.json(); currentChatId = d.chat_id; loadHistory(); }
-                const res = await fetch('/chat', { method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify({ message: promptText, image: imgData, file_text: fileText, username: currentUser,chat_id: currentChatId }) });
-                const data = await res.json(); const aiDiv = document.getElementById(msgId); aiDiv.innerHTML = ""; const contentDiv = document.createElement('div'); contentDiv.className = 'ai-content'; aiDiv.appendChild(contentDiv); await typeWriter(contentDiv, data.response); aiDiv.insertAdjacentHTML('beforeend', `<div class="msg-actions"><i class="fas fa-copy action-icon" onclick="copyAiResponse(this)"></i><i class="fas fa-share-alt action-icon" onclick="shareResponse(this)"></i><i class="fas fa-redo action-icon" onclick="regenerate('${promptText}')"></i></div>`); scrollToBottom(); if(data.new_title) loadHistory();
-            } catch (e) { document.getElementById(msgId).innerHTML = "⚠️ Error: " + e.message; }
         }
         function copyText(text) { navigator.clipboard.writeText(text); }
-        function copyAiResponse(btn) { const text = btn.closest('.ai-msg').querySelector('.ai-content').innerText; navigator.clipboard.writeText(text); }
-        function shareResponse(btn) { const text = btn.closest('.ai-msg').querySelector('.ai-content').innerText; if (navigator.share) navigator.share({ title: 'Student AI', text: text }); else navigator.clipboard.writeText(text); }
         function editMessage(oldText) { document.getElementById('input').value = oldText; document.getElementById('input').focus(); }
         function regenerate(text) { document.getElementById('input').value = text; send(); }
-        document.getElementById('chat-box').addEventListener('click', function(e) { if(e.target.tagName === 'IMG') { const modal = document.getElementById('image-modal'); const modalImg = document.getElementById('modal-img'); modalImg.src = e.target.src; modal.style.display = 'flex'; setTimeout(() => modal.classList.add('active'), 10); } });
-        function closeImagePreview() { const modal = document.getElementById('image-modal'); modal.classList.remove('active'); setTimeout(() => modal.style.display = 'none', 300); }
-        function handleHistoryTouchStart(e, cid) { longPressTimer = setTimeout(() => { e.target.closest('.history-item').classList.add('active-mode'); }, 600); }
         function handleHistoryTouchEnd(e) { clearTimeout(longPressTimer); }
-        function startRename(cid) { const item = document.getElementById('chat-' + cid); const titleSpan = item.querySelector('.h-title'); const currentTitle = titleSpan.innerText; const input = document.createElement('input'); input.type = 'text'; input.value = currentTitle; input.className = 'rename-input'; async function save() { const newTitle = input.value.trim(); if(newTitle && newTitle !== currentTitle) { await fetch('/rename_chat', { method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify({username:currentUser, chat_id:cid, title:newTitle}) }); loadHistory(); } else { loadHistory(); } } input.addEventListener('blur', save); input.addEventListener('keydown', (e) => { if(e.key === 'Enter') { input.blur(); } }); titleSpan.replaceWith(input); input.focus(); }
-        async function deleteChat(cid) { const el = document.getElementById('chat-' + cid); if(el) el.remove(); await fetch('/delete_chat', { method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify({username:currentUser, chat_id:cid}) }); if(currentChatId === cid) newChat(); loadHistory(); }
-        async function loadHistory() { try { const res = await fetch('/get_history', {method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify({username:currentUser})}); const data = await res.json(); const list = document.getElementById('history-list'); list.innerHTML = ""; if (data.chats) { Object.keys(data.chats).reverse().forEach(cid => { const title = data.chats[cid].title || "New Chat"; list.innerHTML += `<div class="history-item" id="chat-${cid}" onclick="loadChat('${cid}')" oncontextmenu="return false;" ontouchstart="handleHistoryTouchStart(event, '${cid}')" ontouchend="handleHistoryTouchEnd(event)"><span class="h-title">${title}</span><div class="h-actions"><i class="fas fa-pen h-icon" onclick="event.stopPropagation(); startRename('${cid}')"></i><i class="fas fa-trash h-icon" onclick="event.stopPropagation(); deleteChat('${cid}')"></i></div></div>`; }); } } catch(e) {} }
-        async function typeWriter(element, markdownText) { element.innerHTML = marked.parse(markdownText); hljs.highlightAll(); if (window.MathJax) await MathJax.typesetPromise([element]); if (window.mermaid) { const m = element.querySelectorAll('code.language-mermaid'); m.forEach(c => { const d = document.createElement('div'); d.className='mermaid'; d.innerHTML=c.innerText; c.parentElement.replaceWith(d); }); window.mermaid.init(undefined, element.querySelectorAll('.mermaid')); } element.style.opacity = 0; element.style.transition = 'opacity 0.4s'; setTimeout(() => { element.style.opacity = 1; scrollToBottom(); }, 50); }
         function toggleSidebar() { document.getElementById('sidebar').classList.toggle('open'); }
-        async function newChat() { currentChatId = null; document.getElementById('chat-box').innerHTML = getIntroHtml(currentUser); const r = await fetch('/new_chat', {method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify({username:currentUser})}); const d = await r.json(); currentChatId = d.chat_id; loadHistory(); document.getElementById('sidebar').classList.remove('open'); }
-        async function loadChat(cid) { currentChatId = cid; const res = await fetch('/get_chat', {method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify({username:currentUser, chat_id:cid})}); const data = await res.json(); const box = document.getElementById('chat-box'); box.innerHTML = ""; data.messages.forEach(msg => { const isUser = msg.role === 'user'; if(isUser) { box.insertAdjacentHTML('beforeend', `<div class="msg user-msg"><div class="user-content">${msg.content.replace(/</g, "&lt;")}</div></div>`); } else { const div = document.createElement('div'); div.className = 'msg ai-msg'; div.innerHTML = `<div class="ai-content">${marked.parse(msg.content)}</div>`; box.appendChild(div); hljs.highlightAll(); if(window.MathJax) MathJax.typesetPromise([div]); div.insertAdjacentHTML('beforeend', `<div class="msg-actions"><i class="fas fa-copy action-icon" onclick="copyAiResponse(this)"></i></div>`); } }); document.getElementById('sidebar').classList.remove('open'); box.scrollTop = box.scrollHeight; }
-        checkLogin();
-    </script>
-</body>
-</html>
-"""
 @app.route("/", methods=["GET"])
 def home(): return render_template_string(HTML_TEMPLATE)
@@ -344,15 +726,19 @@ def chat():
     u, cid, msg = d.get("username"), d.get("chat_id"), d.get("message")
     img_data = d.get("image")
     file_text = d.get("file_text")
     if u not in user_db: user_db[u] = {}
     if cid not in user_db[u]: user_db[u][cid] = {"messages": []}
     user_db[u][cid]["messages"].append({"role": "user", "content": msg})
     reply = generate_with_retry(msg, img_data, file_text, user_db[u][cid]["messages"][:-1])
     user_db[u][cid]["messages"].append({"role": "model", "content": reply})
     new_title = False
     if len(user_db[u][cid]["messages"]) <= 2:
         user_db[u][cid]["title"] = " ".join(msg.split()[:4])
         new_title = True
     save_db(user_db)
     return jsonify({"response": reply, "new_title": new_title})
@@ -360,15 +746,23 @@ def chat():
 def manifest():
     data = {
         "name": "Student's AI",
-        "short_name": "StudentAI",
         "start_url": "/",
         "display": "standalone",
         "orientation": "portrait",
         "background_color": "#09090b",
         "theme_color": "#09090b",
         "icons": [
-            {"src": "https://huggingface.co/spaces/Shirpi/Student-s_AI/resolve/main/1000177401.png", "sizes": "192x192", "type": "image/png"},
-            {"src": "https://huggingface.co/spaces/Shirpi/Student-s_AI/resolve/main/1000177401.png", "sizes": "512x512", "type": "image/png"}
         ]
     }
     return Response(json.dumps(data), mimetype='application/json')

 from flask import Flask, request, jsonify, render_template_string, Response
 import google.generativeai as genai
+# --- FIX: IGNORE DEPRECATION WARNINGS ---
 warnings.filterwarnings("ignore")
+# ==========================================
+# 👇 API KEYS SETUP 👇
+# ==========================================
 keys_string = os.environ.get("API_KEYS", "")
 API_KEYS = [k.strip() for k in keys_string.replace(',', ' ').replace('\n', ' ').split() if k.strip()]
+# --- 💾 DATABASE ---
 DB_FILE = "chat_db.json"
 def load_db():
     try:
 current_key_index = 0
 app = Flask(__name__)
+# --- 🧠 SYSTEM INSTRUCTION ---
 SYSTEM_INSTRUCTION = """
 ROLE: You are "Student's AI", a professional academic tutor.
 RULES:
 5. **CODE:** Use Python/Java/C++ blocks. Explain logic briefly.
 """
+# --- 🧬 MODEL & FILE HANDLING ---
 def get_working_model(key):
     try:
         genai.configure(api_key=key)
     for i in range(len(API_KEYS)):
         key = API_KEYS[current_key_index]
         model_name = get_working_model(key)
         if not model_name:
             current_key_index = (current_key_index + 1) % len(API_KEYS)
             continue
         try:
             genai.configure(api_key=key)
             model = genai.GenerativeModel(model_name=model_name, system_instruction=SYSTEM_INSTRUCTION)
             if image_data or file_text:
                 response = model.generate_content(current_parts)
             else:
         except Exception as e:
             current_key_index = (current_key_index + 1) % len(API_KEYS)
             time.sleep(1)
     return "⚠️ System Busy. Please try again."
+# --- UI TEMPLATE (Start of HTML String) ---
 HTML_TEMPLATE = """
 <!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, interactive-widget=resizes-content">
     <meta name="mobile-web-app-capable" content="yes">
     <meta name="apple-mobile-web-app-capable" content="yes">
     <meta name="theme-color" content="#09090b">
     <link rel="manifest" href="/manifest.json">
     <title>Student's AI</title>
     <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css" rel="stylesheet">
     <link href="https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;700&family=JetBrains+Mono:wght@400;500&display=swap" rel="stylesheet">
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/atom-one-dark.min.css">
     <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js"></script>
     <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
       mermaid.initialize({ startOnLoad: false, theme: 'dark', securityLevel: 'loose' });
       window.mermaid = mermaid;
     </script>
     <style>
+        :root {
+            --bg: #09090b; --card: #18181b; --user-msg: #27272a; --text: #e4e4e7;
+            --accent: #fff; --border: #27272a; --dim: #71717a;
+        }
         * { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
+        body, html {
+            margin: 0; padding: 0; height: 100dvh; width: 100%; max-width: 100%;
+            background: var(--bg); color: var(--text); font-family: 'Outfit', sans-serif;
+            overflow: hidden; font-size: 17px;
+            -webkit-user-select: none; user-select: none;
+        }
+        textarea, input { -webkit-user-select: text !important; user-select: text !important; }
+        .user-content, .ai-content, code, pre { -webkit-user-select: none !important; user-select: none !important; }
+        /* --- APP CONTAINER (Pushed down for Header) --- */
+        #app-container {
+            display: flex; flex-direction: column;
+            height: 100dvh; width: 100%;
+            position: relative; overflow-x: hidden;
+            padding-top: 70px; /* Space for fixed header */
+        }
+        /* --- HEADER LOCKED --- */
+        header {
+            height: 70px; padding: 0 20px; background: rgba(9,9,11, 0.98);
+            border-bottom: 1px solid var(--border-color);
+            display: flex; align-items: center; justify-content: space-between;
+            z-index: 50;
+            padding-top: env(safe-area-inset-top);
+            position: absolute; top: 0; left: 0; right: 0;
+        }
+        .menu-btn {
+            width: 40px; height: 40px; border-radius: 50%; border: 1px solid #333;
+            display: flex; align-items: center; justify-content: center; cursor: pointer;
+            transition: 0.2s; color: #fff;
+        }
+        .menu-btn:active { transform: scale(0.95); background: #222; }
+        .app-title { font-size: 24px; font-weight: 800; letter-spacing: -0.5px; color: #fff; }
+        /* --- SIDEBAR ANIMATION --- */
+        #sidebar {
+            position: fixed; top: 0; left: 0; width: 100%; height: 100%;
+            background: var(--bg); z-index: 100;
+            display: flex; flex-direction: column; padding: 25px;
+            padding-top: calc(70px + env(safe-area-inset-top));
+            transform: translateY(-100%);
+            transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
+            overflow-y: auto;
+        }
         #sidebar.open { transform: translateY(0); }
+        @media (min-width: 768px) {
+            #sidebar { width: 350px; border-right: 1px solid var(--border); }
+            .input-container { max-width: 800px; }
+            #chat-box { padding: 20px 15%; }
+        }
         .user-info { margin-bottom: 30px; font-size: 20px; font-weight: 700; color: #fff; display: flex; align-items: center; gap: 15px; flex-shrink: 0; }
+        .new-chat-btn {
+            width: 100%; padding: 15px; background: #fff; color: #000; border: none;
+            border-radius: 12px; font-weight: 700; font-size: 16px; cursor: pointer; margin-bottom: 25px; flex-shrink: 0;
+        }
+        .history-label { color: var(--dim); font-size: 13px; font-weight: 600; margin-bottom: 10px; letter-spacing: 1px; text-transform: uppercase; flex-shrink: 0; }
         #history-list { flex: 1; overflow-y: auto; padding: 10px 0; min-height: 100px; }
+        .history-item {
+            display: flex; justify-content: space-between; align-items: center;
+            padding: 15px; margin-bottom: 12px; background: var(--card); border: 1px solid var(--border); border-radius: 12px;
+            cursor: pointer; color: #a1a1aa; font-size: 15px; transition: 0.2s;
+        }
+        .history-item:active { background: #222; color: #fff; border-color: #444; }
         .h-title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 200px; flex: 1; margin-right: 10px; }
         .h-actions { display: none; gap: 15px; }
         .history-item.active-mode .h-actions { display: flex; }
+        .h-icon { font-size: 16px; color: #fff; padding: 5px; }
+        .rename-input {
+            background: transparent; border: none; border-bottom: 1px solid #fff;
+            color: #fff; font-family: 'Outfit', sans-serif; font-size: 15px;
+            width: 100%; outline: none; padding: 0;
+        }
         .brand-section { text-align: center; margin-top: 20px; padding-bottom: env(safe-area-inset-bottom); flex-shrink: 0; }
+        .brand-name { font-family: 'Outfit', sans-serif; font-weight: 600; font-size: 12px; color: var(--dim); letter-spacing: 2px; margin-bottom: 10px; opacity: 0.6; }
         .logout-btn { color: #ef4444; cursor: pointer; font-size: 15px; font-weight: 600; padding: 10px; }
+        #chat-box {
+            flex: 1; overflow-y: auto; padding: 20px 5%; padding-bottom: 80px;
+            display: flex; flex-direction: column; gap: 25px;
+            -webkit-overflow-scrolling: touch; overscroll-behavior-y: contain; min-height: 0;
+        }
+        /* --- LOCKED INTRO CONTAINER --- */
         #intro-container {
+            position: absolute;
+            top: 140px; /* Fixed distance from top */
+            left: 50%;
+            transform: translateX(-50%);
+            width: 90%; max-width: 600px;
             text-align: center;
+            z-index: 10;
+            pointer-events: none;
         }
         .msg { width: 100%; line-height: 1.7; font-size: 17px; opacity: 0; animation: fadeInstant 0.3s forwards; display: flex; flex-direction: column; }
         @keyframes fadeInstant { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
         .user-msg { align-items: flex-end; }
         .user-content { display: inline-block; width: fit-content; max-width: 85%; background: var(--user-msg); padding: 10px 16px; border-radius: 18px 18px 4px 18px; text-align: left; color: #fff; word-wrap: break-word; }
         .ai-msg { align-items: flex-start; }
         .ai-content { width: 100%; color: #d4d4d8; word-wrap: break-word; }
+        .ai-content strong { color: #fff; font-weight: 700; }
+        .ai-content h1, .ai-content h2 { margin-top: 20px; color: #fff; font-weight: 700; }
+        .ai-content img, .user-content img { cursor: pointer; transition: 0.2s; }
+        .ai-content img:active, .user-content img:active { transform: scale(0.98); }
+        pre { background: #1e1e1e !important; border-radius: 12px; padding: 15px; overflow-x: auto; margin: 15px 0; border: 1px solid #333; max-width: 100%; }
+        code { font-family: 'JetBrains Mono', monospace; font-size: 14px; }
+        .mjx-chtml { background: #18181b; padding: 10px; border-radius: 8px; border: 1px solid #333; overflow-x: auto; margin: 10px 0; text-align: center; max-width: 100%; }
+        .mermaid { background: #111; padding: 15px; border-radius: 10px; text-align: center; margin: 15px 0; overflow-x: auto; }
+        .msg-actions { margin-top: 10px; opacity: 0; transition: opacity 0.2s; display: flex; gap: 20px; align-items: center; }
+        .user-msg .msg-actions { justify-content: flex-end; }
         .msg:hover .msg-actions { opacity: 1; }
+        .action-icon { cursor: pointer; color: var(--dim); font-size: 18px; transition: 0.2s; }
+        .action-icon:hover { color: #fff; transform: scale(1.1); }
         .input-wrapper { background: var(--bg); padding: 15px; border-top: 1px solid var(--border); flex-shrink: 0; z-index: 60; padding-bottom: max(15px, env(safe-area-inset-bottom)); }
         .input-container { max-width: 900px; margin: 0 auto; background: var(--card); border: 1px solid var(--border); border-radius: 24px; padding: 8px 12px; display: flex; align-items: flex-end; gap: 12px; }
         textarea { flex: 1; background: transparent; border: none; color: #fff; font-size: 17px; max-height: 120px; padding: 10px 5px; resize: none; outline: none; font-family: 'Outfit', sans-serif; }
+        .icon-btn { width: 38px; height: 38px; display: flex; align-items: center; justify-content: center; border-radius: 50%; border: none; background: transparent; color: #a1a1aa; cursor: pointer; font-size: 18px; }
+        .send-btn { background: #fff; color: #000; width: 38px; height: 38px; border-radius: 50%; border: none; display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 18px; }
         #preview-area { position: absolute; bottom: 85px; left: 20px; display: none; z-index: 70; }
+        .preview-box { width: 60px; height: 60px; border-radius: 12px; border: 2px solid #fff; background: #222; overflow: hidden; position: relative; box-shadow: 0 4px 12px rgba(0,0,0,0.5); }
         .preview-img { width: 100%; height: 100%; object-fit: cover; }
+        .remove-preview { position: absolute; top: -8px; right: -8px; background: red; color: white; border-radius: 50%; width: 20px; height: 20px; font-size: 12px; cursor: pointer; border: none; display: flex; align-items: center; justify-content: center; }
+        /* --- LOGIN PAGE STABILITY --- */
+        #login-overlay {
+            position: fixed; inset: 0; background: #000; z-index: 2000;
+            display: flex;
+            align-items: flex-start; justify-content: center;
+            padding-top: 25vh;
+            transition: opacity 0.8s ease; opacity: 1; pointer-events: auto;
+        }
         #login-overlay.hidden { opacity: 0; pointer-events: none; }
+        .login-box {
+            width: 90%; max-width: 350px; text-align: center;
+            padding: 40px; border: 1px solid var(--border); border-radius: 20px; background: #0a0a0a;
+            margin: 0 auto;
+        }
         #image-modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.9); z-index: 3000; display: none; align-items: center; justify-content: center; opacity: 0; transition: opacity 0.3s; }
+        #image-modal img { max-width: 95%; max-height: 90%; border-radius: 8px; box-shadow: 0 0 20px rgba(0,0,0,0.8); }
         #image-modal.active { opacity: 1; }
     </style>
 </head>
 <body>
     <div id="login-overlay">
         <div class="login-box">
             <h1 class="app-title" style="margin-bottom:10px;">Student's AI</h1>
             <button onclick="handleLogin()" style="width:100%; padding:15px; border-radius:12px; border:none; background:#fff; font-weight:800; cursor:pointer; font-size: 16px;">Start Learning</button>
         </div>
     </div>
+    <div id="image-modal" onclick="closeImagePreview()">
+        <img id="modal-img" src="" alt="Preview">
+    </div>
     <div id="sidebar">
         <div style="display:flex; justify-content:space-between; align-items:center; margin-bottom:20px; flex-shrink:0;">
             <div class="user-info"><span id="display-name">User</span></div>
             <div class="logout-btn" onclick="handleLogout()">Log Out</div>
         </div>
     </div>
     <div id="app-container">
         <header>
             <div class="menu-btn" onclick="toggleSidebar()"><i class="fas fa-bars"></i></div>
             <span class="app-title">Student's AI</span>
             <div style="width:40px;"></div>
         </header>
         <div id="chat-box"></div>
         <div class="input-wrapper">
             <div id="preview-area">
                 <div class="preview-box"><div id="preview-visual"></div></div>
                 <button class="remove-preview" onclick="clearAttachment()">×</button>
             </div>
             <div class="input-container">
                 <button class="icon-btn" onclick="document.getElementById('file-input').click()"><i class="fas fa-paperclip"></i></button>
                 <input type="file" id="file-input" accept="image/*,.txt,.py,.js,.html,.css,.md,.csv,.json" hidden onchange="handleFileSelect(this)">
                 <button class="icon-btn" onclick="document.getElementById('camera-input').click()"><i class="fas fa-camera"></i></button>
                 <input type="file" id="camera-input" accept="image/*" capture="environment" hidden onchange="handleFileSelect(this)">
                 <textarea id="input" placeholder="Type a message..." rows="1" oninput="resizeInput(this)"></textarea>
                 <button class="send-btn" onclick="send()"><i class="fas fa-arrow-up"></i></button>
             </div>
         </div>
     </div>
     <script>
+        let currentUser = null;
+        let currentChatId = null;
+        let currentAttachment = { type: null, data: null, name: null };
+        let longPressTimer;
+        // --- FIXED INTRO: LOCKED CONTAINER ---
+        function getIntroHtml(name) {
+            return `<div id="intro-container"><div class="msg ai-msg"><div class="ai-content"><h1>Hi ${name},</h1><p>Ready to master your studies today?</p></div></div></div>`;
+        }
+        // --- AUTH LOGIC ---
+        function checkLogin() {
+            try {
+                const stored = localStorage.getItem("student_ai_user");
+                if (stored) {
+                    currentUser = stored;
+                    document.getElementById("login-overlay").classList.add('hidden');
+                    showApp();
+                }
+            } catch(e) { console.log("Storage access denied"); }
         }
+        function handleLogin() {
+            const input = document.getElementById("username-input");
+            const name = input.value.trim();
+            if(name) {
+                try { localStorage.setItem("student_ai_user", name); } catch(e){}
+                currentUser = name;
+                document.getElementById("login-overlay").classList.add('hidden');
+                showApp();
+            } else {
+                input.style.border = "1px solid red";
+                setTimeout(() => input.style.border = "1px solid #333", 2000);
+            }
+        }
+        function handleLogout() {
+            try { localStorage.removeItem("student_ai_user"); } catch(e){}
+            const overlay = document.getElementById("login-overlay");
+            overlay.classList.remove('hidden');
+            document.getElementById('sidebar').classList.remove('open');
+            setTimeout(() => {
+                document.getElementById('chat-box').innerHTML = "";
+                currentChatId = null;
+                document.getElementById("username-input").value = "";
+            }, 500);
         }
+        function showApp() {
+            document.getElementById("display-name").innerText = "Hi " + currentUser;
+            loadHistory();
+            if(!currentChatId) {
+                const box = document.getElementById("chat-box");
+                if(box.innerHTML === "") {
+                    box.innerHTML = getIntroHtml(currentUser);
+                }
+            }
+        }
+        function resizeInput(el) {
+            el.style.height = 'auto';
+            el.style.height = Math.min(el.scrollHeight, 150) + 'px';
+        }
+        function handleFileSelect(input) {
+            if (input.files && input.files[0]) {
+                const file = input.files[0];
+                const reader = new FileReader();
+                reader.onload = function(e) {
+                    const result = e.target.result;
+                    const isImage = file.type.startsWith('image/');
+                    currentAttachment = { type: isImage ? 'image' : 'file', data: isImage ? result : atob(result.split(',')[1]), name: file.name };
+                    const previewArea = document.getElementById('preview-area');
+                    const visual = document.getElementById('preview-visual');
+                    previewArea.style.display = 'block';
+                    visual.innerHTML = isImage ? `<img src="${result}" class="preview-img">` : `<div class="preview-file-icon"><i class="fas fa-file-alt"></i></div>`;
+                }
+                reader.readAsDataURL(file);
+            }
+            input.value = "";
+        }
+        function clearAttachment() {
+            currentAttachment = { type: null, data: null, name: null };
+            document.getElementById('preview-area').style.display = 'none';
+        }
+        function scrollToBottom() {
+            const box = document.getElementById('chat-box');
+            setTimeout(() => {
+                box.scrollTo({ top: box.scrollHeight, behavior: 'smooth' });
+            }, 100);
+        }
+        async function send() {
+            const input = document.getElementById('input');
+            const text = input.value.trim();
+            if (!text && !currentAttachment.data) return;
+            // --- REMOVE INTRO TEXT IF IT EXISTS ---
+            const intro = document.getElementById('intro-container');
+            if(intro) { intro.style.display = 'none'; intro.remove(); }
+            const chatBox = document.getElementById('chat-box');
+            let attachHtml = '';
+            if (currentAttachment.type === 'image') attachHtml = `<br><img src="${currentAttachment.data}" style="max-height:100px; margin-top:10px; border-radius:8px;">`;
+            if (currentAttachment.type === 'file') attachHtml = `<br><small>📄 ${currentAttachment.name}</small>`;
+            const userHtml = `
+                <div class="msg user-msg">
+                    <div class="user-content">${text.replace(/</g, "&lt;")}${attachHtml}</div>
+                    <div class="msg-actions">
+                         <i class="fas fa-copy action-icon" onclick="copyText('${text}')"></i>
+                         <i class="fas fa-pen action-icon" onclick="editMessage('${text}')"></i>
+                    </div>
+                </div>`;
+            chatBox.insertAdjacentHTML('beforeend', userHtml);
+            const promptText = text;
+            const imgData = currentAttachment.type === 'image' ? currentAttachment.data : null;
+            const fileText = currentAttachment.type === 'file' ? currentAttachment.data : null;
+            input.value = ''; input.style.height = 'auto';
+            clearAttachment();
+            scrollToBottom();
+            const msgId = "ai-" + Date.now();
+            chatBox.insertAdjacentHTML('beforeend', `<div id="${msgId}" class="msg ai-msg"><i class="fas fa-circle-notch fa-spin"></i></div>`);
+            scrollToBottom();
+            try {
+                if (!currentChatId) {
+                    const r = await fetch('/new_chat', {method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify({username:currentUser})});
+                    const d = await r.json(); currentChatId = d.chat_id;
+                    loadHistory();
+                }
+                const res = await fetch('/chat', {
+                    method: 'POST', headers: {'Content-Type': 'application/json'},
+                    body: JSON.stringify({ message: promptText, image: imgData, file_text: fileText, username: currentUser, chat_id: currentChatId })
+                });
+                const data = await res.json();
+                const aiDiv = document.getElementById(msgId);
+                aiDiv.innerHTML = "";
+                const contentDiv = document.createElement('div');
+                contentDiv.className = 'ai-content';
+                aiDiv.appendChild(contentDiv);
+                await typeWriter(contentDiv, data.response);
+                aiDiv.insertAdjacentHTML('beforeend', `
+                    <div class="msg-actions">
+                        <i class="fas fa-copy action-icon" onclick="copyAiResponse(this)"></i>
+                        <i class="fas fa-share-alt action-icon" onclick="shareResponse(this)"></i>
+                        <i class="fas fa-redo action-icon" onclick="regenerate('${promptText}')"></i>
+                    </div>`);
+                scrollToBottom();
+                if(data.new_title) loadHistory();
+            } catch (e) { document.getElementById(msgId).innerHTML = "⚠️ Error: " + e.message; }
+        }
         function copyText(text) { navigator.clipboard.writeText(text); }
+        function copyAiResponse(btn) {
+            const text = btn.closest('.ai-msg').querySelector('.ai-content').innerText;
+            navigator.clipboard.writeText(text);
+        }
+        function shareResponse(btn) {
+            const text = btn.closest('.ai-msg').querySelector('.ai-content').innerText;
+            if (navigator.share) navigator.share({ title: 'Student AI', text: text });
+            else navigator.clipboard.writeText(text);
+        }
         function editMessage(oldText) { document.getElementById('input').value = oldText; document.getElementById('input').focus(); }
         function regenerate(text) { document.getElementById('input').value = text; send(); }
+        document.getElementById('chat-box').addEventListener('click', function(e) {
+            if(e.target.tagName === 'IMG') {
+                const modal = document.getElementById('image-modal');
+                const modalImg = document.getElementById('modal-img');
+                modalImg.src = e.target.src;
+                modal.style.display = 'flex';
+                setTimeout(() => modal.classList.add('active'), 10);
+            }
+        });
+        function closeImagePreview() {
+            const modal = document.getElementById('image-modal');
+            modal.classList.remove('active');
+            setTimeout(() => modal.style.display = 'none', 300);
+        }
+        function handleHistoryTouchStart(e, cid) {
+            longPressTimer = setTimeout(() => {
+                e.target.closest('.history-item').classList.add('active-mode');
+            }, 600);
+        }
         function handleHistoryTouchEnd(e) { clearTimeout(longPressTimer); }
+        function startRename(cid) {
+            const item = document.getElementById('chat-' + cid);
+            const titleSpan = item.querySelector('.h-title');
+            const currentTitle = titleSpan.innerText;
+            const input = document.createElement('input');
+            input.type = 'text'; input.value = currentTitle; input.className = 'rename-input';
+            async function save() {
+                const newTitle = input.value.trim();
+                if(newTitle && newTitle !== currentTitle) {
+                    await fetch('/rename_chat', {
+                        method:'POST', headers:{'Content-Type':'application/json'},
+                        body:JSON.stringify({username:currentUser, chat_id:cid, title:newTitle})
+                    });
+                    loadHistory();
+                } else { loadHistory(); }
+            }
+            input.addEventListener('blur', save);
+            input.addEventListener('keydown', (e) => { if(e.key === 'Enter') { input.blur(); } });
+            titleSpan.replaceWith(input); input.focus();
+        }
+        async function deleteChat(cid) {
+            const el = document.getElementById('chat-' + cid);
+            if(el) el.remove();
+            await fetch('/delete_chat', {
+                method:'POST', headers:{'Content-Type':'application/json'},
+                body:JSON.stringify({username:currentUser, chat_id:cid})
+            });
+            if(currentChatId === cid) newChat();
+            loadHistory();
+        }
+        async function loadHistory() {
+            try {
+                const res = await fetch('/get_history', {method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify({username:currentUser})});
+                const data = await res.json();
+                const list = document.getElementById('history-list'); list.innerHTML = "";
+                if (data.chats) {
+                    Object.keys(data.chats).reverse().forEach(cid => {
+                        const title = data.chats[cid].title || "New Chat";
+                        list.innerHTML += `
+                        <div class="history-item" id="chat-${cid}" onclick="loadChat('${cid}')" oncontextmenu="return false;"
+                             ontouchstart="handleHistoryTouchStart(event, '${cid}')" ontouchend="handleHistoryTouchEnd(event)">
+                            <span class="h-title">${title}</span>
+                            <div class="h-actions">
+                                <i class="fas fa-pen h-icon" onclick="event.stopPropagation(); startRename('${cid}')"></i>
+                                <i class="fas fa-trash h-icon" onclick="event.stopPropagation(); deleteChat('${cid}')"></i>
+                            </div>
+                        </div>`;
+                    });
+                }
+            } catch(e) {}
+        }
+        async function typeWriter(element, markdownText) {
+            element.innerHTML = marked.parse(markdownText);
+            hljs.highlightAll();
+            if (window.MathJax) await MathJax.typesetPromise([element]);
+            if (window.mermaid) {
+                 const m = element.querySelectorAll('code.language-mermaid');
+                 m.forEach(c => { const d = document.createElement('div'); d.className='mermaid'; d.innerHTML=c.innerText; c.parentElement.replaceWith(d); });
+                 window.mermaid.init(undefined, element.querySelectorAll('.mermaid'));
+            }
+            element.style.opacity = 0; element.style.transition = 'opacity 0.4s';
+            setTimeout(() => { element.style.opacity = 1; scrollToBottom(); }, 50);
+        }
         function toggleSidebar() { document.getElementById('sidebar').classList.toggle('open'); }
+        async function newChat() {
+            currentChatId = null;
+            document.getElementById('chat-box').innerHTML = getIntroHtml(currentUser);
+            const r = await fetch('/new_chat', {method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify({username:currentUser})});
+            const d = await r.json(); currentChatId = d.chat_id; loadHistory();
+            document.getElementById('sidebar').classList.remove('open');
+        }
+        async function loadChat(cid) {
+            currentChatId = cid; const res = await fetch('/get_chat', {method:'POST', headers:{'Content-Type':'application/json'}, body:JSON.stringify({username:currentUser, chat_id:cid})});
+            const data = await res.json(); const box = document.getElementById('chat-box'); box.innerHTML = "";
+            data.messages.forEach(msg => {
+                const isUser = msg.role === 'user';
+                if(isUser) {
+                    box.insertAdjacentHTML('beforeend', `<div class="msg user-msg"><div class="user-content">${msg.content.replace(/</g, "&lt;")}</div></div>`);
+                } else {
+                    const div = document.createElement('div'); div.className = 'msg ai-msg';
+                    div.innerHTML = `<div class="ai-content">${marked.parse(msg.content)}</div>`;
+                    box.appendChild(div);
+                    hljs.highlightAll();
+                    if(window.MathJax) MathJax.typesetPromise([div]);
+                    div.insertAdjacentHTML('beforeend', `<div class="msg-actions"><i class="fas fa-copy action-icon" onclick="copyAiResponse(this)"></i></div>`);
+                }
+            });
+            document.getElementById('sidebar').classList.remove('open');
+            box.scrollTop = box.scrollHeight;
+        }
+        @app.route('/manifest.json')
+        def manifest():
+            data = {
+                "name": "Student's AI",
+                "short_name": "StudentAI",
+                "start_url": "/",
+                "display": "standalone",
+                "orientation": "portrait",
+                "background_color": "#09090b",
+                "theme_color": "#09090b",
+                "icons": [
+                    {
+                        "src": "https://cdn-icons-png.flaticon.com/512/4712/4712035.png",
+                        "sizes": "192x192",
+                        "type": "image/png"
+                    },
+                    {
+                        "src": "https://cdn-icons-png.flaticon.com/512/4712/4712035.png",
+                        "sizes": "512x512",
+                        "type": "image/png"
+                    }
+                ]
+            }
+            return Response(json.dumps(data), mimetype='application/json')
+        if __name__ == '__main__':
+            app.run(host='0.0.0.0', port=7860)
+""" # --- END OF HTML TEMPLATE STRING ---
+# --- BACKEND ROUTES ---
 @app.route("/", methods=["GET"])
 def home(): return render_template_string(HTML_TEMPLATE)
     u, cid, msg = d.get("username"), d.get("chat_id"), d.get("message")
     img_data = d.get("image")
     file_text = d.get("file_text")
     if u not in user_db: user_db[u] = {}
     if cid not in user_db[u]: user_db[u][cid] = {"messages": []}
     user_db[u][cid]["messages"].append({"role": "user", "content": msg})
     reply = generate_with_retry(msg, img_data, file_text, user_db[u][cid]["messages"][:-1])
     user_db[u][cid]["messages"].append({"role": "model", "content": reply})
     new_title = False
     if len(user_db[u][cid]["messages"]) <= 2:
         user_db[u][cid]["title"] = " ".join(msg.split()[:4])
         new_title = True
     save_db(user_db)
     return jsonify({"response": reply, "new_title": new_title})
 def manifest():
     data = {
         "name": "Student's AI",
+        "short_name": "Student's AI",
         "start_url": "/",
         "display": "standalone",
         "orientation": "portrait",
         "background_color": "#09090b",
         "theme_color": "#09090b",
         "icons": [
+            {
+                "src": "https://huggingface.co/spaces/Shirpi/Student-s_AI/resolve/main/1000177401.png",
+                "sizes": "192x192",
+                "type": "image/png"
+            },
+            {
+                "src": "https://huggingface.co/spaces/Shirpi/Student-s_AI/resolve/main/1000177401.png",
+                "sizes": "512x512",
+                "type": "image/png"
+            }
         ]
     }
     return Response(json.dumps(data), mimetype='application/json')