app.py

import gradio as gr
import os
import json
import time
import uuid
from datetime import datetime
from groq import Groq
import pandas as pd
from typing import Dict, List, Tuple, Optional
import re
import hashlib
import sqlite3
from utils.diagram_generator import DiagramGenerator
from utils.rag_system import EnhancedRAGSystem

# Initialize components
def get_groq_client():
    api_key = os.getenv("GROQ_API_KEY")
    if not api_key:
        raise ValueError("GROQ_API_KEY environment variable not set")
    return Groq(api_key=api_key)

class UserManager:
    def __init__(self):
        self.db_path = 'users.db'
        self.init_database()
    
    def init_database(self):
        """Initialize SQLite database for users"""
        conn = sqlite3.connect(self.db_path)
        cursor = conn.cursor()
        
        cursor.execute('''
            CREATE TABLE IF NOT EXISTS users (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                username TEXT UNIQUE NOT NULL,
                email TEXT UNIQUE NOT NULL,
                password_hash TEXT NOT NULL,
                full_name TEXT,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                last_login TIMESTAMP
            )
        ''')
        
        cursor.execute('''
            CREATE TABLE IF NOT EXISTS chat_sessions (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                user_id INTEGER,
                session_id TEXT UNIQUE,
                title TEXT,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                FOREIGN KEY (user_id) REFERENCES users (id)
            )
        ''')
        
        cursor.execute('''
            CREATE TABLE IF NOT EXISTS messages (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                session_id TEXT,
                role TEXT,
                content TEXT,
                timestamp TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                FOREIGN KEY (session_id) REFERENCES chat_sessions (session_id)
            )
        ''')
        
        conn.commit()
        conn.close()
    
    def hash_password(self, password: str) -> str:
        """Hash password using SHA-256"""
        return hashlib.sha256(password.encode()).hexdigest()
    
    def create_user(self, username: str, email: str, password: str, full_name: str = "") -> Tuple[bool, str]:
        """Create new user account"""
        try:
            conn = sqlite3.connect(self.db_path)
            cursor = conn.cursor()
            
            password_hash = self.hash_password(password)
            cursor.execute(
                "INSERT INTO users (username, email, password_hash, full_name) VALUES (?, ?, ?, ?)",
                (username, email, password_hash, full_name)
            )
            
            conn.commit()
            conn.close()
            return True, "Account created successfully!"
            
        except sqlite3.IntegrityError as e:
            if "username" in str(e):
                return False, "Username already exists"
            elif "email" in str(e):
                return False, "Email already registered"
            else:
                return False, "Registration failed"
        except Exception as e:
            return False, f"Error: {str(e)}"
    
    def authenticate_user(self, username: str, password: str) -> Tuple[bool, Optional[Dict]]:
        """Authenticate user login"""
        try:
            conn = sqlite3.connect(self.db_path)
            cursor = conn.cursor()
            
            password_hash = self.hash_password(password)
            cursor.execute(
                "SELECT id, username, email, full_name FROM users WHERE username = ? AND password_hash = ?",
                (username, password_hash)
            )
            
            user = cursor.fetchone()
            
            if user:
                # Update last login
                cursor.execute(
                    "UPDATE users SET last_login = CURRENT_TIMESTAMP WHERE id = ?",
                    (user[0],)
                )
                conn.commit()
                
                user_data = {
                    'id': user[0],
                    'username': user[1],
                    'email': user[2],
                    'full_name': user[3] or user[1]
                }
                conn.close()
                return True, user_data
            
            conn.close()
            return False, None
            
        except Exception as e:
            return False, None
    
    def get_user_sessions(self, user_id: int) -> List[Dict]:
        """Get chat sessions for user"""
        try:
            conn = sqlite3.connect(self.db_path)
            cursor = conn.cursor()
            
            cursor.execute(
                "SELECT session_id, title, created_at FROM chat_sessions WHERE user_id = ? ORDER BY updated_at DESC",
                (user_id,)
            )
            
            sessions = cursor.fetchall()
            conn.close()
            
            return [
                {
                    'session_id': session[0],
                    'title': session[1] or f"Chat {session[0][:8]}",
                    'created_at': session[2]
                }
                for session in sessions
            ]
            
        except Exception as e:
            return []

class PowerSystemsConsultant:
    def __init__(self):
        self.groq_client = get_groq_client()
        self.rag_system = EnhancedRAGSystem()
        self.diagram_generator = DiagramGenerator()
        self.user_manager = UserManager()
        self.current_user = None
        self.current_session = None
    
    def generate_response(self, user_query: str, chat_history: List[Tuple[str, str]], session_id: str = None) -> Tuple[str, str]:
        """Generate response using Groq LLM with RAG context"""
        try:
            # Check if query is asking for a diagram
            diagram_type = self.detect_diagram_request(user_query)
            diagram_svg = None
            
            if diagram_type:
                diagram_svg = self.generate_diagram(diagram_type, user_query)
            
            # Retrieve relevant context
            context = self.rag_system.retrieve_context(user_query)
            
            # Prepare system prompt
            system_prompt = f"""You are a Power Systems Mini-Consultant AI assistant specializing in electrical power systems. 
            You help with:
            1. Fault analysis and calculations
            2. Protection system design
            3. Standards interpretation (IEEE, IEC, ANSI)
            4. Study materials and exam preparation
            5. Practice problem generation
            6. Engineering diagrams and visualizations
            
            Use the following context from the knowledge base:
            {context}
            
            Provide clear, technical explanations with practical examples. Include relevant formulas, standards references, and safety considerations when appropriate.
            
            If a user asks for diagrams or visual representations, mention that you can generate professional engineering diagrams including:
            - Single line diagrams
            - Fault analysis diagrams  
            - Protection coordination curves
            - Phasor diagrams
            - Impedance diagrams
            """
            
            # Prepare conversation context
            messages = [{"role": "system", "content": system_prompt}]
            
            # Add chat history
            for human_msg, ai_msg in chat_history[-5:]:  # Last 5 exchanges
                messages.append({"role": "user", "content": human_msg})
                messages.append({"role": "assistant", "content": ai_msg})
            
            # Add current query
            messages.append({"role": "user", "content": user_query})
            
            # Generate response using Groq
            response = self.groq_client.chat.completions.create(
                model="llama3-70b-8192",
                messages=messages,
                max_tokens=2000,
                temperature=0.8
            )
            
            text_response = response.choices[0].message.content
            
            # Save to database if session exists
            if session_id and self.current_user:
                self.save_message(session_id, "user", user_query)
                self.save_message(session_id, "assistant", text_response)
            
            return text_response, diagram_svg
            
        except Exception as e:
            error_msg = f"Error generating response: {str(e)}. Please check your GROQ_API_KEY and try again."
            return error_msg, None
    
    def detect_diagram_request(self, query: str) -> Optional[str]:
        """Detect if user is requesting a diagram"""
        query_lower = query.lower()
        
        diagram_keywords = {
            'single line': 'single_line',
            'single-line': 'single_line',
            'fault analysis': 'fault_analysis',
            'fault diagram': 'fault_analysis',
            'protection coordination': 'protection_coordination',
            'coordination curve': 'protection_coordination',
            'phasor diagram': 'phasor',
            'phasor': 'phasor',
            'impedance diagram': 'impedance',
            'distance protection': 'impedance',
            'r-x diagram': 'impedance'
        }
        
        for keyword, diagram_type in diagram_keywords.items():
            if keyword in query_lower:
                return diagram_type
        
        return None
    
    def generate_diagram(self, diagram_type: str, query: str) -> str:
        """Generate appropriate diagram based on type"""
        try:
            if diagram_type == 'single_line':
                return self.diagram_generator.generate_single_line_diagram({})
            elif diagram_type == 'fault_analysis':
                fault_type = 'line_to_ground'
                if 'line to line' in query.lower() or 'l-l' in query.lower():
                    fault_type = 'line_to_line'
                elif 'three phase' in query.lower() or '3-phase' in query.lower():
                    fault_type = 'three_phase'
                return self.diagram_generator.generate_fault_analysis_diagram(fault_type)
            elif diagram_type == 'protection_coordination':
                return self.diagram_generator.generate_protection_coordination_diagram()
            elif diagram_type == 'phasor':
                condition = 'balanced'
                if 'unbalanced' in query.lower() or 'fault' in query.lower():
                    condition = 'unbalanced'
                return self.diagram_generator.generate_phasor_diagram(condition)
            elif diagram_type == 'impedance':
                return self.diagram_generator.generate_impedance_diagram()
        except Exception as e:
            return f"<text>Error generating diagram: {str(e)}</text>"
        
        return None
    
    def generate_practice_pack(self, topic: str, difficulty: str, num_questions: int) -> str:
        """Generate practice questions pack"""
        try:
            practice_prompt = f"""Generate {num_questions} power systems practice questions about {topic} at {difficulty} level.
            Format the response with:
            1. Question number and statement
            2. Multiple choice options (A, B, C, D) when appropriate
            3. Detailed solution with step-by-step calculations
            4. Key concepts and formulas used
            5. References to relevant standards
            
            Focus on practical engineering scenarios and include numerical calculations where applicable."""
            
            messages = [
                {"role": "system", "content": "You are an expert power systems engineer creating practice questions for students and professionals."},
                {"role": "user", "content": practice_prompt}
            ]
            
            response = self.groq_client.chat.completions.create(
                model="llama3-70b-8192",
                messages=messages,
                max_tokens=3000,
                temperature=0.7
            )
            
            return response.choices[0].message.content
            
        except Exception as e:
            return f"Error generating practice pack: {str(e)}"
    
    def explain_standard(self, standard: str) -> str:
        """Explain power systems standard"""
        try:
            standard_prompt = f"""Provide a comprehensive explanation of the {standard} standard including:
            1. Purpose and scope of the standard
            2. Key requirements and specifications
            3. Practical applications in power systems
            4. Important clauses and sections
            5. Relationship to other standards
            6. Implementation considerations
            7. Common misconceptions or challenges
            
            Make it practical and useful for power systems engineers."""
            
            messages = [
                {"role": "system", "content": "You are an expert in power systems standards and regulations with deep knowledge of IEEE, IEC, and ANSI standards."},
                {"role": "user", "content": standard_prompt}
            ]
            
            response = self.groq_client.chat.completions.create(
                model="llama3-70b-8192",
                messages=messages,
                max_tokens=2500,
                temperature=0.6
            )
            
            return response.choices[0].message.content
            
        except Exception as e:
            return f"Error explaining standard: {str(e)}"
    
    def create_chat_session(self, user_id: int, title: str = None) -> str:
        """Create new chat session"""
        session_id = str(uuid.uuid4())
        
        try:
            conn = sqlite3.connect(self.user_manager.db_path)
            cursor = conn.cursor()
            
            cursor.execute(
                "INSERT INTO chat_sessions (user_id, session_id, title) VALUES (?, ?, ?)",
                (user_id, session_id, title or f"Chat {datetime.now().strftime('%m/%d %H:%M')}")
            )
            
            conn.commit()
            conn.close()
            
            return session_id
            
        except Exception as e:
            return str(uuid.uuid4())  # Fallback to temporary session
    
    def save_message(self, session_id: str, role: str, content: str):
        """Save message to database"""
        try:
            conn = sqlite3.connect(self.user_manager.db_path)
            cursor = conn.cursor()
            
            cursor.execute(
                "INSERT INTO messages (session_id, role, content) VALUES (?, ?, ?)",
                (session_id, role, content)
            )
            
            # Update session timestamp
            cursor.execute(
                "UPDATE chat_sessions SET updated_at = CURRENT_TIMESTAMP WHERE session_id = ?",
                (session_id,)
            )
            
            conn.commit()
            conn.close()
            
        except Exception as e:
            pass  # Continue without saving if database error
    
    def load_chat_history(self, session_id: str) -> List[Tuple[str, str]]:
        """Load chat history from database"""
        try:
            conn = sqlite3.connect(self.user_manager.db_path)
            cursor = conn.cursor()
            
            cursor.execute(
                "SELECT role, content FROM messages WHERE session_id = ? ORDER BY timestamp",
                (session_id,)
            )
            
            messages = cursor.fetchall()
            conn.close()
            
            # Convert to chat history format
            history = []
            current_pair = [None, None]
            
            for role, content in messages:
                if role == "user":
                    if current_pair[0] is not None:
                        history.append((current_pair[0], current_pair[1] or ""))
                    current_pair = [content, None]
                elif role == "assistant":
                    current_pair[1] = content
            
            # Add the last pair if complete
            if current_pair[0] is not None:
                history.append((current_pair[0], current_pair[1] or ""))
            
            return history
            
        except Exception as e:
            return []

# Initialize the consultant
try:
    consultant = PowerSystemsConsultant()
    initialization_status = "✅ Power Systems Consultant initialized successfully!"
except Exception as e:
    consultant = None
    initialization_status = f"❌ Initialization failed: {str(e)}"

# Global state management
current_user = gr.State(None)
current_session = gr.State(None)
chat_sessions = gr.State([])

# UI Functions
def login_user(username, password):
    """Handle user login"""
    if not consultant:
        return False, None, "System not initialized", gr.update(), gr.update()
    
    success, user_data = consultant.user_manager.authenticate_user(username, password)
    
    if success:
        consultant.current_user = user_data
        sessions = consultant.user_manager.get_user_sessions(user_data['id'])
        
        # Create session list for sidebar
        session_choices = [(f"{s['title']} ({s['created_at'][:10]})", s['session_id']) for s in sessions]
        
        return (
            True, 
            user_data, 
            f"Welcome back, {user_data['full_name']}!",
            gr.update(choices=session_choices, value=session_choices[0][1] if session_choices else None),
            gr.update(visible=True)
        )
    else:
        return False, None, "Invalid username or password", gr.update(), gr.update()

def register_user(username, email, password, confirm_password, full_name):
    """Handle user registration"""
    if not consultant:
        return False, "System not initialized"
    
    if password != confirm_password:
        return False, "Passwords do not match"
    
    if len(password) < 6:
        return False, "Password must be at least 6 characters"
    
    success, message = consultant.user_manager.create_user(username, email, password, full_name)
    return success, message

def start_new_chat(user_data):
    """Start a new chat session"""
    if not consultant or not user_data:
        return None, []
    
    session_id = consultant.create_chat_session(user_data['id'])
    consultant.current_session = session_id
    
    # Update sessions list
    sessions = consultant.user_manager.get_user_sessions(user_data['id'])
    session_choices = [(f"{s['title']} ({s['created_at'][:10]})", s['session_id']) for s in sessions]
    
    return session_id, session_choices

def load_selected_chat(session_id, user_data):
    """Load selected chat session"""
    if not consultant or not session_id:
        return []
    
    consultant.current_session = session_id
    history = consultant.load_chat_history(session_id)
    
    return history

def chat_interface(message, history, user_data, session_id):
    """Main chat interface function"""
    if not consultant:
        return history + [["", "❌ System not initialized. Please check GROQ_API_KEY."]], "", None
    
    if not user_data:
        return history + [["", "Please log in to continue."]], "", None
    
    if not message.strip():
        return history + [[message, "Please enter a question about power systems."]], "", None
    
    try:
        # Generate response and potential diagram
        response, diagram_svg = consultant.generate_response(message, history, session_id)
        
        # Update history
        new_history = history + [[message, response]]
        
        return new_history, "", diagram_svg
        
    except Exception as e:
        return history + [[message, f"Error: {str(e)}"]], "", None

def generate_practice_questions(topic, difficulty, num_questions, user_data):
    """Generate practice pack interface"""
    if not consultant:
        return "❌ System not initialized. Please check GROQ_API_KEY."
    
    if not user_data:
        return "Please log in to access this feature."
    
    try:
        practice_pack = consultant.generate_practice_pack(topic, difficulty, int(num_questions))
        return practice_pack
    except Exception as e:
        return f"Error generating practice pack: {str(e)}"

def explain_standard_interface(standard, user_data):
    """Standards explanation interface"""
    if not consultant:
        return "❌ System not initialized. Please check GROQ_API_KEY."
    
    if not user_data:
        return "Please log in to access this feature."
    
    try:
        explanation = consultant.explain_standard(standard)
        return explanation
    except Exception as e:
        return f"Error explaining standard: {str(e)}"

# Create the main application interface with modern design
def create_app():
    with gr.Blocks(
        theme=gr.themes.Monochrome(
            primary_hue=gr.themes.colors.blue,
            secondary_hue=gr.themes.colors.cyan,
            neutral_hue=gr.themes.colors.slate,
        ),
        title="⚡ Power Systems Consultant",
        css="""
            @import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');
            @import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css');
            
            * {
                font-family: 'Inter', system-ui, -apple-system, sans-serif;
                box-sizing: border-box;
            }
            
            /* Dark theme variables */
            :root {
                --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
                --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
                --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
                --warning-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
                --danger-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
                --dark-bg: #0f0f23;
                --card-bg: rgba(255, 255, 255, 0.05);
                --glass-bg: rgba(255, 255, 255, 0.1);
                --text-primary: #ffffff;
                --text-secondary: rgba(255, 255, 255, 0.7);
                --border-color: rgba(255, 255, 255, 0.1);
                --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
                --shadow-xl: 0 35px 60px -12px rgba(0, 0, 0, 0.35);
            }
            
            /* Root styling */
            .gradio-container {
                background: var(--dark-bg);
                color: var(--text-primary);
                min-height: 100vh;
            }
            
            /* Animated header */
            .hero-header {
                background: var(--primary-gradient);
                padding: 4rem 2rem;
                border-radius: 25px;
                margin: 2rem 0;
                text-align: center;
                position: relative;
                overflow: hidden;
                box-shadow: var(--shadow-xl);
                animation: slideInDown 0.8s ease-out;
            }
            
            .hero-header::before {
                content: '';
                position: absolute;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                background: linear-gradient(45deg, rgba(255,255,255,0.1) 0%, transparent 50%, rgba(255,255,255,0.1) 100%);
                animation: shimmer 3s ease-in-out infinite;
            }
            
            .hero-title {
                font-size: 3.5rem;
                font-weight: 800;
                margin: 0;
                background: linear-gradient(45deg, #ffffff, #f0f9ff);
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                text-shadow: 0 4px 8px rgba(0,0,0,0.3);
                position: relative;
                z-index: 1;
            }
            
            .hero-subtitle {
                font-size: 1.25rem;
                margin: 1rem 0 0 0;
                color: rgba(255,255,255,0.9);
                font-weight: 400;
                position: relative;
                z-index: 1;
            }
            
            .hero-icon {
                font-size: 4rem;
                margin-bottom: 1rem;
                color: #fbbf24;
                animation: pulse 2s ease-in-out infinite;
                position: relative;
                z-index: 1;
            }
            
            /* Status cards */
            .status-card {
                background: var(--glass-bg);
                backdrop-filter: blur(20px);
                border: 1px solid var(--border-color);
                border-radius: 20px;
                padding: 2rem;
                margin: 2rem 0;
                box-shadow: var(--shadow-lg);
                position: relative;
                overflow: hidden;
                animation: fadeInUp 0.6s ease-out;
            }
            
            .status-success {
                background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(34, 197, 94, 0.05));
                border-color: rgba(34, 197, 94, 0.3);
            }
            
            .status-error {
                background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(239, 68, 68, 0.05));
                border-color: rgba(239, 68, 68, 0.3);
            }
            
            /* Modern login/register cards */
            .auth-container {
                background: var(--glass-bg);
                backdrop-filter: blur(20px);
                border: 1px solid var(--border-color);
                border-radius: 25px;
                padding: 3rem;
                max-width: 500px;
                margin: 2rem auto;
                box-shadow: var(--shadow-xl);
                position: relative;
                overflow: hidden;
                animation: zoomIn 0.5s ease-out;
            }
            
            .auth-container::before {
                content: '';
                position: absolute;
                top: -2px;
                left: -2px;
                right: -2px;
                bottom: -2px;
                background: var(--primary-gradient);
                border-radius: 25px;
                z-index: -1;
                opacity: 0.7;
            }
            
            .auth-title {
                text-align: center;
                font-size: 2rem;
                font-weight: 700;
                margin-bottom: 2rem;
                background: var(--primary-gradient);
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
            }
            
            /* Enhanced input fields */
            .gradio-textbox, .gradio-dropdown {
                background: rgba(255, 255, 255, 0.05) !important;
                border: 2px solid rgba(255, 255, 255, 0.1) !important;
                border-radius: 15px !important;
                padding: 1rem !important;
                color: var(--text-primary) !important;
                font-size: 1rem !important;
                transition: all 0.3s ease !important;
                backdrop-filter: blur(10px) !important;
            }
            
            .gradio-textbox:focus, .gradio-dropdown:focus {
                border-color: #667eea !important;
                box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.2) !important;
                transform: translateY(-2px) !important;
            }
            
            /* Modern buttons */
            .gradio-button {
                background: var(--primary-gradient) !important;
                border: none !important;
                border-radius: 15px !important;
                padding: 1rem 2rem !important;
                font-weight: 600 !important;
                font-size: 1rem !important;
                color: white !important;
                cursor: pointer !important;
                transition: all 0.3s ease !important;
                text-transform: uppercase !important;
                letter-spacing: 0.5px !important;
                box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3) !important;
                position: relative !important;
                overflow: hidden !important;
            }
            
            .gradio-button:hover {
                transform: translateY(-3px) !important;
                box-shadow: 0 15px 35px rgba(102, 126, 234, 0.4) !important;
            }
            
            .gradio-button:active {
                transform: translateY(-1px) !important;
            }
            
            .gradio-button::before {
                content: '';
                position: absolute;
                top: 0;
                left: -100%;
                width: 100%;
                height: 100%;
                background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
                transition: left 0.5s;
            }
            
            .gradio-button:hover::before {
                left: 100%;
            }
            
            /* Feature cards */
            .feature-card {
                background: var(--glass-bg);
                backdrop-filter: blur(20px);
                border: 1px solid var(--border-color);
                border-radius: 25px;
                padding: 2.5rem;
                margin: 1.5rem 0;
                box-shadow: var(--shadow-lg);
                transition: all 0.4s ease;
                position: relative;
                overflow: hidden;
                animation: fadeInUp 0.8s ease-out;
            }
            
            .feature-card:hover {
                transform: translateY(-8px);
                box-shadow: var(--shadow-xl);
            }
            
            .feature-card::before {
                content: '';
                position: absolute;
                top: 0;
                left: 0;
                right: 0;
                height: 4px;
                background: var(--primary-gradient);
                border-radius: 25px 25px 0 0;
            }
            
            .feature-title {
                font-size: 1.5rem;
                font-weight: 700;
                margin-bottom: 1rem;
                background: var(--primary-gradient);
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                display: flex;
                align-items: center;
                gap: 0.75rem;
            }
            
            .feature-description {
                color: var(--text-secondary);
                font-size: 1.1rem;
                line-height: 1.6;
            }
            
            /* Modern sidebar */
            .modern-sidebar {
                background: var(--glass-bg);
                backdrop-filter: blur(20px);
                border: 1px solid var(--border-color);
                border-radius: 25px;
                padding: 2rem;
                margin: 1rem;
                min-height: 700px;
                box-shadow: var(--shadow-lg);
                position: relative;
                overflow: hidden;
            }
            
            .sidebar-header {
                text-align: center;
                margin-bottom: 2rem;
                padding-bottom: 1rem;
                border-bottom: 1px solid var(--border-color);
            }
            
            .sidebar-title {
                font-size: 1.25rem;
                font-weight: 700;
                background: var(--primary-gradient);
                -webkit-background-clip: text;
                -webkit-text-fill-color: transparent;
                display: flex;
                align-items: center;
                justify-content: center;
                gap: 0.5rem;
            }
            
            /* Chat interface styling */
            .chat-container {
                background: var(--glass-bg);
                backdrop-filter: blur(20px);
                border: 1px solid var(--border-color);
                border-radius: 25px;
                overflow: hidden;
                box-shadow: var(--shadow-lg);
                margin: 1rem;
                min-height: 600px;
            }
            
            .chat-header {
                background: var(--primary-gradient);
                padding: 1.5rem;
                text-align: center;
                color: white;
                font-weight: 600;
                font-size: 1.1rem;
                position: relative;
            }
            
            .chat-header::after {
                content: '';
                position: absolute;
                bottom: 0;
                left: 50%;
                transform: translateX(-50%);
                width: 60px;
                height: 3px;
                background: rgba(255,255,255,0.5);
                border-radius: 3px;
            }
            
            /* Chatbot messages */
            .message-wrap {
                padding: 1rem;
                margin: 0.5rem;
                border-radius: 20px;
                animation: messageSlide 0.4s ease-out;
                backdrop-filter: blur(10px);
                border: 1px solid rgba(255,255,255,0.1);
            }
            
            .user-message {
                background: linear-gradient(135deg, rgba(102, 126, 234, 0.2), rgba(118, 75, 162, 0.2));
                margin-left: 2rem;
                text-align: right;
            }
            
            .bot-message {
                background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(34, 197, 94, 0.05));
                margin-right: 2rem;
            }
            
            /* Diagram container */
            .diagram-container {
                background: var(--glass-bg);
                backdrop-filter: blur(20px);
                border: 2px solid var(--border-color);
                border-radius: 20px;
                padding: 2rem;
                margin: 2rem 0;
                text-align: center;
                box-shadow: var(--shadow-lg);
                transition: all 0.3s ease;
            }
            
            .diagram-container:hover {
                transform: scale(1.02);
                box-shadow: var(--shadow-xl);
            }
            
            .diagram-placeholder {
                color: var(--text-secondary);
                font-style: italic;
                padding: 3rem;
                border: 2px dashed var(--border-color);
                border-radius: 15px;
                background: rgba(255,255,255,0.02);
            }
            
            /* Tab styling */
            .gradio-tabs {
                background: transparent;
            }
            
            .gradio-tabitem {
                background: var(--glass-bg);
                backdrop-filter: blur(20px);
                border: 1px solid var(--border-color);
                border-radius: 20px;
                padding: 2rem;
                margin-top: 1rem;
                box-shadow: var(--shadow-lg);
            }
            
            /* Progress and loading animations */
            .loading-spinner {
                display: inline-block;
                width: 20px;
                height: 20px;
                border: 3px solid rgba(255,255,255,0.3);
                border-radius: 50%;
                border-top-color: #667eea;
                animation: spin 1s ease-in-out infinite;
            }
            
            /* Accordions */
            .gradio-accordion {
                background: var(--glass-bg) !important;
                border: 1px solid var(--border-color) !important;
                border-radius: 20px !important;
                margin: 1rem 0 !important;
                overflow: hidden !important;
                box-shadow: var(--shadow-lg) !important;
                backdrop-filter: blur(20px) !important;
            }
            
            .formula-box {
                background: rgba(102, 126, 234, 0.1);
                border: 1px solid rgba(102, 126, 234, 0.3);
                border-radius: 15px;
                padding: 2rem;
                margin: 1.5rem 0;
                font-family: 'Courier New', monospace;
                position: relative;
                overflow: hidden;
            }
            
            .formula-box::before {
                content: '';
                position: absolute;
                top: 0;
                left: 0;
                right: 0;
                height: 3px;
                background: var(--primary-gradient);
            }
            
            .formula-title {
                font-size: 1.2rem;
                font-weight: 700;
                color: #667eea;
                margin-bottom: 1rem;
                display: flex;
                align-items: center;
                gap: 0.5rem;
            }
            
            .formula-code {
                background: rgba(0,0,0,0.3);
                border-radius: 8px;
                padding: 0.75rem 1rem;
                font-family: 'Courier New', monospace;
                color: #fbbf24;
                border-left: 4px solid #667eea;
                margin: 0.5rem 0;
                display: block;
                overflow-x: auto;
            }
            
            /* Animations */
            @keyframes slideInDown {
                from { transform: translateY(-50px); opacity: 0; }
                to { transform: translateY(0); opacity: 1; }
            }
            
            @keyframes fadeInUp {
                from { transform: translateY(30px); opacity: 0; }
                to { transform: translateY(0); opacity: 1; }
            }
            
            @keyframes zoomIn {
                from { transform: scale(0.9); opacity: 0; }
                to { transform: scale(1); opacity: 1; }
            }
            
            @keyframes shimmer {
                0% { transform: translateX(-100%); }
                100% { transform: translateX(100%); }
            }
            
            @keyframes pulse {
                0%, 100% { opacity: 1; transform: scale(1); }
                50% { opacity: 0.8; transform: scale(1.05); }
            }
            
            @keyframes spin {
                to { transform: rotate(360deg); }
            }
            
            @keyframes messageSlide {
                from { transform: translateX(-20px); opacity: 0; }
                to { transform: translateX(0); opacity: 1; }
            }
            
            /* Responsive design */
            @media (max-width: 768px) {
                .hero-title { font-size: 2.5rem; }
                .hero-subtitle { font-size: 1rem; }
                .auth-container { margin: 1rem; padding: 2rem; }
                .feature-card { padding: 1.5rem; margin: 1rem 0; }
                .modern-sidebar { margin: 0.5rem; padding: 1rem; }
                .chat-container { margin: 0.5rem; }
            }
            
            /* Scrollbar styling */
            ::-webkit-scrollbar {
                width: 8px;
            }
            
            ::-webkit-scrollbar-track {
                background: rgba(255,255,255,0.1);
                border-radius: 4px;
            }
            
            ::-webkit-scrollbar-thumb {
                background: var(--primary-gradient);
                border-radius: 4px;
            }
            
            ::-webkit-scrollbar-thumb:hover {
                background: linear-gradient(135deg, #5a67d8, #6b46c1);
            }
            
            /* Enhanced interactivity */
            .interactive-card {
                cursor: pointer;
                transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
                position: relative;
            }
            
            .interactive-card:hover {
                transform: translateY(-5px) scale(1.02);
                box-shadow: 0 25px 50px rgba(102, 126, 234, 0.25);
            }
            
            .interactive-card::after {
                content: '';
                position: absolute;
                top: 0;
                left: 0;
                right: 0;
                bottom: 0;
                border-radius: inherit;
                background: linear-gradient(45deg, transparent, rgba(255,255,255,0.05), transparent);
                opacity: 0;
                transition: opacity 0.3s ease;
            }
            
            .interactive-card:hover::after {
                opacity: 1;
            }
            
            /* Glowing effects */
            .glow-effect {
                position: relative;
                overflow: hidden;
            }
            
            .glow-effect::before {
                content: '';
                position: absolute;
                top: -2px;
                left: -2px;
                right: -2px;
                bottom: -2px;
                background: var(--primary-gradient);
                border-radius: inherit;
                z-index: -1;
                filter: blur(8px);
                opacity: 0.7;
                animation: glow 2s ease-in-out infinite alternate;
            }
            
            @keyframes glow {
                from { filter: blur(8px) brightness(1); }
                to { filter: blur(12px) brightness(1.2); }
            }
            
            /* Particle background effect */
            .particle-bg {
                position: relative;
                overflow: hidden;
            }
            
            .particle-bg::before {
                content: '';
                position: absolute;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                background-image: 
                    radial-gradient(2px 2px at 20% 30%, rgba(102, 126, 234, 0.3), transparent),
                    radial-gradient(2px 2px at 40% 70%, rgba(118, 75, 162, 0.3), transparent),
                    radial-gradient(1px 1px at 90% 40%, rgba(240, 171, 252, 0.3), transparent),
                    radial-gradient(1px 1px at 50% 50%, rgba(34, 197, 94, 0.2), transparent);
                background-repeat: repeat;
                background-size: 100px 100px;
                animation: float 20s ease-in-out infinite;
                pointer-events: none;
            }
            
            @keyframes float {
                0%, 100% { transform: translateY(0px); }
                50% { transform: translateY(-20px); }
            }
            
            /* Status indicators */
            .status-indicator {
                display: inline-flex;
                align-items: center;
                gap: 0.5rem;
                padding: 0.5rem 1rem;
                border-radius: 50px;
                font-size: 0.9rem;
                font-weight: 600;
                text-transform: uppercase;
                letter-spacing: 0.5px;
            }
            
            .status-online {
                background: linear-gradient(135deg, rgba(34, 197, 94, 0.2), rgba(34, 197, 94, 0.1));
                color: #22c55e;
                border: 1px solid rgba(34, 197, 94, 0.3);
            }
            
            .status-offline {
                background: linear-gradient(135deg, rgba(239, 68, 68, 0.2), rgba(239, 68, 68, 0.1));
                color: #ef4444;
                border: 1px solid rgba(239, 68, 68, 0.3);
            }
            
            .status-indicator::before {
                content: '';
                width: 8px;
                height: 8px;
                border-radius: 50%;
                background: currentColor;
                animation: pulse 2s ease-in-out infinite;
            }
        """
    ) as app:
        
        # State management
        user_state = gr.State(None)
        session_state = gr.State(None)
        sessions_state = gr.State([])
        
        # Modern Hero Header
        gr.HTML("""
            <div class="hero-header particle-bg">
                <div class="hero-icon">
                    <i class="fas fa-bolt"></i>
                </div>
                <h1 class="hero-title">Power Systems Consultant</h1>
                <p class="hero-subtitle">Advanced AI Assistant for Fault Analysis, Protection Systems & Engineering Excellence</p>
            </div>
        """)
        
        # Dynamic Status Display
        status_class = "status-online" if "✅" in initialization_status else "status-offline"
        status_icon = "fas fa-check-circle" if "✅" in initialization_status else "fas fa-exclamation-triangle"
        
        gr.HTML(f"""
            <div class="status-card {'status-success' if '✅' in initialization_status else 'status-error'}">
                <div class="status-indicator {status_class}">
                    <i class="{status_icon}"></i>
                    <span>System Status</span>
                </div>
                <p style="margin: 1rem 0 0 0; font-size: 1.1rem;">{initialization_status}</p>
            </div>
        """)
        
        # Authentication Section with Modern Design
        with gr.Row():
            with gr.Column(visible=True) as login_section:
                gr.HTML("""
                    <div style="text-align: center; margin: 3rem 0;">
                        <i class="fas fa-user-shield" style="font-size: 3rem; color: #667eea; margin-bottom: 1rem;"></i>
                        <h2 style="font-size: 2.5rem; font-weight: 800; background: linear-gradient(135deg, #667eea, #764ba2); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin: 0;">Secure Access Portal</h2>
                        <p style="color: var(--text-secondary); font-size: 1.1rem; margin-top: 1rem;">Sign in to access your personalized Power Systems workspace</p>
                    </div>
                """)
                
                with gr.Tabs():
                    with gr.TabItem("🔑 Sign In"):
                        with gr.Column(elem_classes=["auth-container"]):
                            gr.HTML('<div class="auth-title"><i class="fas fa-sign-in-alt"></i> Welcome Back</div>')
                            login_username = gr.Textbox(
                                label="👤 Username", 
                                placeholder="Enter your username",
                                elem_classes=["modern-input"]
                            )
                            login_password = gr.Textbox(
                                label="🔒 Password", 
                                type="password", 
                                placeholder="Enter your password",
                                elem_classes=["modern-input"]
                            )
                            login_btn = gr.Button(
                                "🚀 Sign In", 
                                variant="primary", 
                                size="lg",
                                elem_classes=["glow-effect"]
                            )
                            login_status = gr.Textbox(
                                label="📊 Status", 
                                interactive=False,
                                elem_classes=["status-display"]
                            )
                    
                    with gr.TabItem("📝 Create Account"):
                        with gr.Column(elem_classes=["auth-container"]):
                            gr.HTML('<div class="auth-title"><i class="fas fa-user-plus"></i> Join Our Community</div>')
                            reg_username = gr.Textbox(
                                label="👤 Username", 
                                placeholder="Choose a unique username",
                                elem_classes=["modern-input"]
                            )
                            reg_email = gr.Textbox(
                                label="📧 Email", 
                                placeholder="[email protected]",
                                elem_classes=["modern-input"]
                            )
                            reg_full_name = gr.Textbox(
                                label="🏷️ Full Name", 
                                placeholder="Your full name",
                                elem_classes=["modern-input"]
                            )
                            reg_password = gr.Textbox(
                                label="🔒 Password", 
                                type="password", 
                                placeholder="Create a strong password (min 6 chars)",
                                elem_classes=["modern-input"]
                            )
                            reg_confirm_password = gr.Textbox(
                                label="🔐 Confirm Password", 
                                type="password", 
                                placeholder="Confirm your password",
                                elem_classes=["modern-input"]
                            )
                            register_btn = gr.Button(
                                "✨ Create Account", 
                                variant="primary", 
                                size="lg",
                                elem_classes=["glow-effect"]
                            )
                            register_status = gr.Textbox(
                                label="📊 Status", 
                                interactive=False,
                                elem_classes=["status-display"]
                            )
        
        # Main Application Interface (hidden initially)
        with gr.Column(visible=False) as main_section:
            # Dynamic User Welcome
            user_welcome = gr.HTML()
            
            with gr.Tabs():
                # AI Consultant Chat Tab
                with gr.TabItem("🤖 AI Consultant"):
                    with gr.Row():
                        # Modern Sidebar
                        with gr.Column(scale=1, elem_classes=["modern-sidebar"]):
                            gr.HTML("""
                                <div class="sidebar-header">
                                    <div class="sidebar-title">
                                        <i class="fas fa-history"></i>
                                        Chat Sessions
                                    </div>
                                </div>
                            """)
                            new_chat_btn = gr.Button(
                                "➕ New Conversation", 
                                variant="primary", 
                                size="sm",
                                elem_classes=["interactive-card"]
                            )
                            chat_sessions_dropdown = gr.Dropdown(
                                label="📜 Previous Chats",
                                choices=[],
                                value=None,
                                interactive=True,
                                elem_classes=["modern-dropdown"]
                            )
                            
                            # Quick Actions
                            gr.HTML("""
                                <div style="margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--border-color);">
                                    <h4 style="color: var(--text-primary); margin-bottom: 1rem;">
                                        <i class="fas fa-rocket"></i> Quick Actions
                                    </h4>
                                    <div style="display: flex; flex-direction: column; gap: 0.5rem;">
                                        <button class="quick-action-btn" onclick="document.querySelector('textarea').value='Explain three-phase fault analysis'; document.querySelector('textarea').dispatchEvent(new Event('input', {bubbles: true}));">
                                            <i class="fas fa-zap"></i> Fault Analysis
                                        </button>
                                        <button class="quick-action-btn" onclick="document.querySelector('textarea').value='Generate a single line diagram'; document.querySelector('textarea').dispatchEvent(new Event('input', {bubbles: true}));">
                                            <i class="fas fa-sitemap"></i> Create Diagram
                                        </button>
                                        <button class="quick-action-btn" onclick="document.querySelector('textarea').value='Explain IEEE C37.2 standard'; document.querySelector('textarea').dispatchEvent(new Event('input', {bubbles: true}));">
                                            <i class="fas fa-book"></i> Standards Help
                                        </button>
                                    </div>
                                </div>
                                <style>
                                .quick-action-btn {
                                    background: rgba(102, 126, 234, 0.1);
                                    border: 1px solid rgba(102, 126, 234, 0.3);
                                    border-radius: 10px;
                                    padding: 0.75rem;
                                    color: var(--text-primary);
                                    cursor: pointer;
                                    transition: all 0.3s ease;
                                    text-align: left;
                                    font-size: 0.9rem;
                                }
                                .quick-action-btn:hover {
                                    background: rgba(102, 126, 234, 0.2);
                                    transform: translateX(5px);
                                }
                                .quick-action-btn i {
                                    margin-right: 0.5rem;
                                    color: #667eea;
                                }
                                </style>
                            """)
                        
                        # Main Chat Interface
                        with gr.Column(scale=3):
                            gr.HTML("""
                                <div class="feature-card interactive-card">
                                    <div class="feature-title">
                                        <i class="fas fa-robot"></i>
                                        Intelligent Power Systems Consultant
                                    </div>
                                    <div class="feature-description">
                                        Your AI-powered companion for fault analysis, protection systems, standards interpretation, and engineering calculations. Ask complex questions and get expert-level responses with diagrams and detailed explanations.
                                    </div>
                                </div>
                            """)
                            
                            # Enhanced Chat Interface
                            with gr.Column(elem_classes=["chat-container"]):
                                gr.HTML("""
                                    <div class="chat-header">
                                        <i class="fas fa-comments"></i>
                                        Power Systems AI Assistant
                                    </div>
                                """)
                                
                                chatbot = gr.Chatbot(
                                    height=500,
                                    placeholder="🤖 Your AI Power Systems Consultant is ready to help...",
                                    show_label=False,
                                    elem_classes=["modern-chatbot"],
                                    avatar_images=("🧑‍💼", "🤖")
                                )
                                
                                with gr.Row():
                                    msg = gr.Textbox(
                                        placeholder="💬 Ask about faults, protection, standards, calculations, or request engineering diagrams...",
                                        show_label=False,
                                        container=False,
                                        scale=4,
                                        elem_classes=["chat-input"]
                                    )
                                    
                                with gr.Row():
                                    submit_btn = gr.Button(
                                        "🚀 Send", 
                                        variant="primary", 
                                        scale=1,
                                        elem_classes=["glow-effect"]
                                    )
                                    clear_btn = gr.Button(
                                        "🗑️ Clear", 
                                        variant="secondary", 
                                        scale=1
                                    )
                            
                            # Enhanced Diagram Display
                            gr.HTML("""
                                <div class="feature-card">
                                    <div class="feature-title">
                                        <i class="fas fa-chart-line"></i>
                                        Generated Engineering Diagrams
                                    </div>
                                </div>
                            """)
                            diagram_display = gr.HTML(
                                value="""
                                <div class="diagram-container">
                                    <div class="diagram-placeholder">
                                        <i class="fas fa-drafting-compass" style="font-size: 3rem; color: var(--text-secondary); margin-bottom: 1rem;"></i>
                                        <p>🎨 Professional engineering diagrams will appear here when you request them</p>
                                        <p style="margin-top: 1rem; font-size: 0.9rem; opacity: 0.7;">Try asking for: "Generate a single line diagram" or "Show me a phasor diagram"</p>
                                    </div>
                                </div>
                                """,
                                elem_classes=["modern-diagram-display"]
                            )
                
                # Practice Pack Generator Tab
                with gr.TabItem("📚 Practice Generator"):
                    gr.HTML("""
                        <div class="feature-card interactive-card particle-bg">
                            <div class="feature-title">
                                <i class="fas fa-dumbbell"></i>
                                AI-Generated Practice Questions
                            </div>
                            <div class="feature-description">
                                Generate customized practice packs with varying difficulty levels, complete with detailed solutions, step-by-step calculations, and standards references. Perfect for exam preparation and skill development.
                            </div>
                        </div>
                    """)
                    
                    with gr.Row():
                        with gr.Column(scale=1):
                            gr.HTML("""
                                <div class="feature-card">
                                    <div class="feature-title">
                                        <i class="fas fa-sliders-h"></i>
                                        Customize Your Practice Pack
                                    </div>
                                </div>
                            """)
                            
                            topic_input = gr.Dropdown(
                                choices=[
                                    "🔥 Fault Analysis", "🛡️ Protection Systems", "⚡ Power Flow",
                                    "📊 Stability Studies", "🎯 Relay Coordination", "🔌 Transformers",
                                    "📡 Transmission Lines", "💫 Load Flow", "⚠️ Short Circuit Analysis",
                                    "🌊 Harmonics", "⭐ Power Quality", "🖥️ SCADA Systems"
                                ],
                                label="📋 Select Topic",
                                value="🔥 Fault Analysis",
                                elem_classes=["modern-dropdown"]
                            )
                            
                            difficulty_input = gr.Radio(
                                choices=["🟢 Beginner", "🟡 Intermediate", "🔴 Advanced"],
                                label="🎯 Difficulty Level",
                                value="🟡 Intermediate",
                                elem_classes=["modern-radio"]
                            )
                            
                            num_questions_input = gr.Slider(
                                minimum=5,
                                maximum=20,
                                step=1,
                                value=10,
                                label="🔢 Number of Questions",
                                elem_classes=["modern-slider"]
                            )
                            
                            generate_btn = gr.Button(
                                "🎯 Generate Practice Pack", 
                                variant="primary",
                                elem_classes=["glow-effect", "interactive-card"]
                            )
                        
                        with gr.Column(scale=2):
                            practice_output = gr.Textbox(
                                label="📖 Generated Practice Pack",
                                lines=20,
                                placeholder="🚀 Your customized practice questions will appear here with detailed solutions and explanations...",
                                elem_classes=["modern-output"]
                            )
                
                # Standards Explorer Tab
                with gr.TabItem("📋 Standards Explorer"):
                    gr.HTML("""
                        <div class="feature-card interactive-card particle-bg">
                            <div class="feature-title">
                                <i class="fas fa-university"></i>
                                Power Systems Standards Library
                            </div>
                            <div class="feature-description">
                                Comprehensive explanations of IEEE, IEC, and international standards with practical applications, implementation guidelines, and real-world examples from industry experts.
                            </div>
                        </div>
                    """)
                    
                    with gr.Row():
                        with gr.Column(scale=1):
                            gr.HTML("""
                                <div class="feature-card">
                                    <div class="feature-title">
                                        <i class="fas fa-search"></i>
                                        Explore Standards
                                    </div>
                                </div>
                            """)
                            
                            standard_input = gr.Dropdown(
                                choices=[
                                    "📜 IEEE C37.2 - Device Function Numbers",
                                    "🔌 IEEE 1547 - Distributed Generation",
                                    "🌊 IEEE 519 - Harmonic Control",
                                    "🔧 IEEE C57.12.00 - Transformers",
                                    "🏭 IEC 61850 - Substation Automation",
                                    "⚡ IEC 60909 - Short-Circuit Calculations",
                                    "🔄 IEC 61131 - PLC Programming",
                                    "🛡️ IEC 60255 - Electrical Relays",
                                    "⚖️ ANSI C84.1 - Voltage Ratings",
                                    "📊 IEEE 242 - Protection & Coordination",
                                    "🏭 IEEE 399 - Industrial Power Systems",
                                    "🔧 IEEE C37.010 - Application Guide"
                                ],
                                label="📑 Select Standard",
                                value="📜 IEEE C37.2 - Device Function Numbers",
                                elem_classes=["modern-dropdown"]
                            )
                            
                            explain_btn = gr.Button(
                                "📖 Explain Standard", 
                                variant="primary",
                                elem_classes=["glow-effect", "interactive-card"]
                            )
                        
                        with gr.Column(scale=2):
                            standard_output = gr.Textbox(
                                label="📋 Standard Explanation",
                                lines=15,
                                placeholder="📚 Detailed standard explanation with practical applications will appear here...",
                                elem_classes=["modern-output"]
                            )
                
                # Enhanced Study Resources Tab
                with gr.TabItem("📚 Study Resources"):
                    gr.HTML("""
                        <div class="feature-card interactive-card particle-bg">
                            <div class="feature-title">
                                <i class="fas fa-graduation-cap"></i>
                                Comprehensive Study Guide
                            </div>
                            <div class="feature-description">
                                Essential formulas, concepts, quick reference materials, and exam preparation resources for power systems engineering. Your complete study companion for academic and professional success.
                            </div>
                        </div>
                    """)
                    
                    with gr.Accordion("⚡ Fault Analysis Formulas", open=False):
                        gr.HTML("""
                            <div class="formula-box">
                                <div class="formula-title">
                                    <i class="fas fa-bolt"></i>
                                    Three-Phase Fault Current
                                </div>
                                <code class="formula-code">I_fault = V_nominal / Z_total</code>
                                
                                <div class="formula-title" style="margin-top: 2rem;">
                                    <i class="fas fa-exclamation-triangle"></i>
                                    Line-to-Ground Fault
                                </div>
                                <code class="formula-code">I_fault = 3 × V_nominal / (Z1 + Z2 + Z0)</code>
                                
                                <div class="formula-title" style="margin-top: 2rem;">
                                    <i class="fas fa-arrows-alt-h"></i>
                                    Line-to-Line Fault
                                </div>
                                <code class="formula-code">I_fault = √3 × V_nominal / (Z1 + Z2)</code>
                                
                                <div class="formula-title" style="margin-top: 2rem;">
                                    <i class="fas fa-network-wired"></i>
                                    Double Line-to-Ground Fault
                                </div>
                                <code class="formula-code">I_fault = V_nominal × [Z2 + Z0] / [Z1 × (Z2 + Z0) + Z2 × Z0]</code>
                                
                                <div style="margin-top: 2rem; padding: 1.5rem; background: rgba(34, 197, 94, 0.1); border-radius: 10px; border-left: 4px solid #22c55e;">
                                    <h5 style="color: #22c55e; margin: 0 0 1rem 0;">
                                        <i class="fas fa-lightbulb"></i> Pro Tips
                                    </h5>
                                    <ul style="color: var(--text-secondary); line-height: 1.6;">
                                        <li>Always check if impedances are in per-unit or actual values</li>
                                        <li>Consider pre-fault voltage conditions (typically 1.0 pu)</li>
                                        <li>Verify sequence impedance values from equipment data</li>
                                        <li>Account for fault resistance when applicable</li>
                                    </ul>
                                </div>
                            </div>
                        """)
                    
                    with gr.Accordion("🛡️ Protection System Principles", open=False):
                        gr.HTML("""
                            <div class="formula-box">
                                <div class="formula-title">
                                    <i class="fas fa-shield-alt"></i>
                                    Overcurrent Protection
                                </div>
                                <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin: 1.5rem 0;">
                                    <div style="background: rgba(102, 126, 234, 0.1); padding: 1.5rem; border-radius: 10px;">
                                        <h6 style="color: #667eea; margin: 0 0 1rem 0;">Time Characteristics</h6>
                                        <ul style="color: var(--text-secondary); line-height: 1.8; margin: 0; padding-left: 1.5rem;">
                                            <li>Inverse Time Curves</li>
                                            <li>Coordination Intervals (0.2-0.5s)</li>
                                            <li>Pickup Settings (1.25-1.5 × FLA)</li>
                                            <li>Time Dial Adjustments</li>
                                        </ul>
                                    </div>
                                    <div style="background: rgba(118, 75, 162, 0.1); padding: 1.5rem; border-radius: 10px;">
                                        <h6 style="color: #764ba2; margin: 0 0 1rem 0;">Curve Types</h6>
                                        <ul style="color: var(--text-secondary); line-height: 1.8; margin: 0; padding-left: 1.5rem;">
                                            <li>Standard Inverse (SI)</li>
                                            <li>Very Inverse (VI)</li>
                                            <li>Extremely Inverse (EI)</li>
                                            <li>Definite Time</li>
                                        </ul>
                                    </div>
                                </div>
                                
                                <div class="formula-title" style="margin-top: 2rem;">
                                    <i class="fas fa-ruler"></i>
                                    Distance Protection Zones
                                </div>
                                <div style="background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(34, 197, 94, 0.05)); padding: 2rem; border-radius: 15px; margin: 1rem 0;">
                                    <div style="display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; text-align: center;">
                                        <div style="background: rgba(34, 197, 94, 0.2); padding: 1.5rem; border-radius: 10px;">
                                            <h6 style="color: #22c55e; margin: 0 0 0.5rem 0;">Zone 1</h6>
                                            <p style="color: var(--text-primary); font-size: 1.1rem; margin: 0;">80-85% of line</p>
                                            <p style="color: var(--text-secondary); font-size: 0.9rem; margin: 0.5rem 0 0 0;">Instantaneous</p>
                                        </div>
                                        <div style="background: rgba(251, 191, 36, 0.2); padding: 1.5rem; border-radius: 10px;">
                                            <h6 style="color: #fbbf24; margin: 0 0 0.5rem 0;">Zone 2</h6>
                                            <p style="color: var(--text-primary); font-size: 1.1rem; margin: 0;">120% + 50% next</p>
                                            <p style="color: var(--text-secondary); font-size: 0.9rem; margin: 0.5rem 0 0 0;">Time Delayed</p>
                                        </div>
                                        <div style="background: rgba(239, 68, 68, 0.2); padding: 1.5rem; border-radius: 10px;">
                                            <h6 style="color: #ef4444; margin: 0 0 0.5rem 0;">Zone 3</h6>
                                            <p style="color: var(--text-primary); font-size: 1.1rem; margin: 0;">Backup coverage</p>
                                            <p style="color: var(--text-secondary); font-size: 0.9rem; margin: 0.5rem 0 0 0;">Extended delay</p>
                                        </div>
                                    </div>
                                </div>
                                
                                <div class="formula-title" style="margin-top: 2rem;">
                                    <i class="fas fa-balance-scale"></i>
                                    Differential Protection
                                </div>
                                <code class="formula-code">Restraint = (|I1| + |I2|) / 2</code>
                                <code class="formula-code">Operating = |I1 + I2|</code>
                                <code class="formula-code">Operate if: Operating > (Slope × Restraint + Pickup)</code>
                            </div>
                        """)
                    
                    with gr.Accordion("📐 Power System Calculations", open=False):
                        gr.HTML("""
                            <div class="formula-box">
                                <div class="formula-title">
                                    <i class="fas fa-calculator"></i>
                                    Three-Phase Power Formulas
                                </div>
                                <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin: 2rem 0;">
                                    <div>
                                        <h6 style="color: #667eea; margin: 0 0 1rem 0;">Real Power</h6>
                                        <code class="formula-code">P = √3 × V × I × cos(φ)</code>
                                        <p style="color: var(--text-secondary); font-size: 0.9rem; margin: 0.5rem 0;">Watts (W)</p>
                                    </div>
                                    <div>
                                        <h6 style="color: #667eea; margin: 0 0 1rem 0;">Reactive Power</h6>
                                        <code class="formula-code">Q = √3 × V × I × sin(φ)</code>
                                        <p style="color: var(--text-secondary); font-size: 0.9rem; margin: 0.5rem 0;">Vars</p>
                                    </div>
                                    <div>
                                        <h6 style="color: #667eea; margin: 0 0 1rem 0;">Apparent Power</h6>
                                        <code class="formula-code">S = √3 × V × I</code>
                                        <p style="color: var(--text-secondary); font-size: 0.9rem; margin: 0.5rem 0;">VA</p>
                                    </div>
                                    <div>
                                        <h6 style="color: #667eea; margin: 0 0 1rem 0;">Power Factor</h6>
                                        <code class="formula-code">PF = P / S = cos(φ)</code>
                                        <p style="color: var(--text-secondary); font-size: 0.9rem; margin: 0.5rem 0;">Dimensionless</p>
                                    </div>
                                </div>
                                
                                <div class="formula-title" style="margin-top: 2rem;">
                                    <i class="fas fa-arrows-alt"></i>
                                    Per-Unit System Conversions
                                </div>
                                <code class="formula-code">Z_pu = Z_actual × (S_base / V_base²)</code>
                                <code class="formula-code">Z_new = Z_old × (S_new/S_old) × (V_old/V_new)²</code>
                                
                                <div style="background: rgba(251, 191, 36, 0.1); padding: 1.5rem; border-radius: 10px; margin: 2rem 0;">
                                    <h6 style="color: #fbbf24; margin: 0 0 1rem 0;">
                                        <i class="fas fa-lightbulb"></i> Base Value Relationships
                                    </h6>
                                    <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;">
                                        <code class="formula-code" style="background: rgba(0,0,0,0.2);">S_base = √3 × V_base × I_base</code>
                                        <code class="formula-code" style="background: rgba(0,0,0,0.2);">Z_base = V_base² / S_base</code>
                                    </div>
                                </div>
                                
                                <div class="formula-title" style="margin-top: 2rem;">
                                    <i class="fas fa-plug"></i>
                                    Transformer Calculations
                                </div>
                                <code class="formula-code">X_pu = (% impedance / 100) × (S_base / S_transformer)</code>
                                <code class="formula-code">Turn_ratio = V_primary / V_secondary</code>
                                <code class="formula-code">I_secondary = I_primary × Turn_ratio</code>
                            </div>
                        """)
                    
                    with gr.Accordion("📊 Standards Quick Reference", open=False):
                        gr.HTML("""
                            <div class="formula-box">
                                <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; margin: 2rem 0;">
                                    <div>
                                        <div class="formula-title">
                                            <i class="fas fa-flag-usa"></i>
                                            IEEE Standards
                                        </div>
                                        <div style="background: rgba(102, 126, 234, 0.1); padding: 1.5rem; border-radius: 10px; margin: 1rem 0;">
                                            <div style="display: flex; flex-direction: column; gap: 1rem;">
                                                <div style="display: flex; justify-content: space-between; align-items: center; padding: 0.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.1);">
                                                    <strong style="color: #667eea;">C37.2</strong>
                                                    <span style="color: var(--text-secondary); font-size: 0.9rem;">Device Function Numbers</span>
                                                </div>
                                                <div style="display: flex; justify-content: space-between; align-items: center; padding: 0.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.1);">
                                                    <strong style="color: #667eea;">519</strong>
                                                    <span style="color: var(--text-secondary); font-size: 0.9rem;">Harmonic Control</span>
                                                </div>
                                                <div style="display: flex; justify-content: space-between; align-items: center; padding: 0.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.1);">
                                                    <strong style="color: #667eea;">1547</strong>
                                                    <span style="color: var(--text-secondary); font-size: 0.9rem;">Distributed Generation</span>
                                                </div>
                                                <div style="display: flex; justify-content: space-between; align-items: center; padding: 0.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.1);">
                                                    <strong style="color: #667eea;">242</strong>
                                                    <span style="color: var(--text-secondary); font-size: 0.9rem;">Protection & Coordination</span>
                                                </div>
                                                <div style="display: flex; justify-content: space-between; align-items: center; padding: 0.5rem 0;">
                                                    <strong style="color: #667eea;">399</strong>
                                                    <span style="color: var(--text-secondary); font-size: 0.9rem;">Industrial Power Analysis</span>
                                                </div>
                                            </div>
                                        </div>
                                    </div>
                                    
                                    <div>
                                        <div class="formula-title">
                                            <i class="fas fa-globe"></i>
                                            IEC Standards
                                        </div>
                                        <div style="background: rgba(118, 75, 162, 0.1); padding: 1.5rem; border-radius: 10px; margin: 1rem 0;">
                                            <div style="display: flex; flex-direction: column; gap: 1rem;">
                                                <div style="display: flex; justify-content: space-between; align-items: center; padding: 0.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.1);">
                                                    <strong style="color: #764ba2;">61850</strong>
                                                    <span style="color: var(--text-secondary); font-size: 0.9rem;">Substation Automation</span>
                                                </div>
                                                <div style="display: flex; justify-content: space-between; align-items: center; padding: 0.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.1);">
                                                    <strong style="color: #764ba2;">60909</strong>
                                                    <span style="color: var(--text-secondary); font-size: 0.9rem;">Short-Circuit Calculations</span>
                                                </div>
                                                <div style="display: flex; justify-content: space-between; align-items: center; padding: 0.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.1);">
                                                    <strong style="color: #764ba2;">60255</strong>
                                                    <span style="color: var(--text-secondary); font-size: 0.9rem;">Electrical Relays</span>
                                                </div>
                                                <div style="display: flex; justify-content: space-between; align-items: center; padding: 0.5rem 0; border-bottom: 1px solid rgba(255,255,255,0.1);">
                                                    <strong style="color: #764ba2;">61131</strong>
                                                    <span style="color: var(--text-secondary); font-size: 0.9rem;">PLC Programming</span>
                                                </div>
                                                <div style="display: flex; justify-content: space-between; align-items: center; padding: 0.5rem 0;">
                                                    <strong style="color: #764ba2;">62271</strong>
                                                    <span style="color: var(--text-secondary); font-size: 0.9rem;">High-Voltage Switchgear</span>
                                                </div>
                                            </div>
                                        </div>
                                    </div>
                                </div>
                            </div>
                        """)
                    
                    with gr.Accordion("🎓 Professional Exam Preparation", open=False):
                        gr.HTML("""
                            <div class="formula-box">
                                <div class="formula-title">
                                    <i class="fas fa-graduation-cap"></i>
                                    PE Exam Power Topics
                                </div>
                                <div style="display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; margin: 2rem 0;">
                                    <div style="background: rgba(34, 197, 94, 0.1); padding: 2rem; border-radius: 15px;">
                                        <h6 style="color: #22c55e; margin: 0 0 1.5rem 0; display: flex; align-items: center; gap: 0.5rem;">
                                            <i class="fas fa-check-circle"></i>
                                            Core Topics (60-70%)
                                        </h6>
                                        <ul style="color: var(--text-secondary); line-height: 2; margin: 0; padding-left: 1.5rem;">
                                            <li>Three-phase circuit analysis</li>
                                            <li>Symmetrical components</li>
                                            <li>Fault analysis calculations</li>
                                            <li>Protection system coordination</li>
                                            <li>Power flow studies</li>
                                            <li>Transformer connections</li>
                                            <li>Motor starting analysis</li>
                                        </ul>
                                    </div>
                                    
                                    <div style="background: rgba(251, 191, 36, 0.1); padding: 2rem; border-radius: 15px;">
                                        <h6 style="color: #fbbf24; margin: 0 0 1.5rem 0; display: flex; align-items: center; gap: 0.5rem;">
                                            <i class="fas fa-star"></i>
                                            Advanced Topics (30-40%)
                                        </h6>
                                        <ul style="color: var(--text-secondary); line-height: 2; margin: 0; padding-left: 1.5rem;">
                                            <li>Economic dispatch</li>
                                            <li>Stability studies</li>
                                            <li>Harmonics & power quality</li>
                                            <li>Grounding systems</li>
                                            <li>Arc flash analysis</li>
                                            <li>Renewable integration</li>
                                            <li>Load forecasting</li>
                                        </ul>
                                    </div>
                                </div>
                                
                                <div class="formula-title" style="margin-top: 2rem;">
                                    <i class="fas fa-brain"></i>
                                    Essential Formulas to Memorize
                                </div>
                                <div style="background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1)); padding: 2rem; border-radius: 15px; margin: 1rem 0;">
                                    <div style="display: grid; grid-template-columns: 1fr; gap: 1rem;">
                                        <div style="background: rgba(255,255,255,0.05); padding: 1rem; border-radius: 8px; border-left: 4px solid #667eea;">
                                            <strong style="color: #667eea;">Symmetrical Components:</strong>
                                            <code style="display: block; margin-top: 0.5rem; color: var(--text-secondary);">a = 1∠120°, a² = 1∠240°</code>
                                        </div>
                                        <div style="background: rgba(255,255,255,0.05); padding: 1rem; border-radius: 8px; border-left: 4px solid #764ba2;">
                                            <strong style="color: #764ba2;">Power Triangle:</strong>
                                            <code style="display: block; margin-top: 0.5rem; color: var(--text-secondary);">S² = P² + Q², PF = P/S</code>
                                        </div>
                                        <div style="background: rgba(255,255,255,0.05); padding: 1rem; border-radius: 8px; border-left: 4px solid #22c55e;">
                                            <strong style="color: #22c55e;">Transmission Line:</strong>
                                            <code style="display: block; margin-top: 0.5rem; color: var(--text-secondary);">Z = √(R + jωL)/(G + jωC)</code>
                                        </div>
                                        <div style="background: rgba(255,255,255,0.05); padding: 1rem; border-radius: 8px; border-left: 4px solid #fbbf24;">
                                            <strong style="color: #fbbf24;">Regulation:</strong>
                                            <code style="display: block; margin-top: 0.5rem; color: var(--text-secondary);">%Reg = (V_no-load - V_full-load)/V_full-load × 100</code>
                                        </div>
                                    </div>
                                </div>
                                
                                <div style="background: rgba(34, 197, 94, 0.1); padding: 2rem; border-radius: 15px; margin: 2rem 0; border-left: 4px solid #22c55e;">
                                    <h6 style="color: #22c55e; margin: 0 0 1rem 0;">
                                        <i class="fas fa-lightbulb"></i> Exam Success Tips
                                    </h6>
                                    <div style="display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem;">
                                        <ul style="color: var(--text-secondary); line-height: 1.8; margin: 0; padding-left: 1.5rem;">
                                            <li>Practice time management</li>
                                            <li>Master per-unit conversions</li>
                                            <li>Understand phasor diagrams</li>
                                            <li>Know protection principles</li>
                                        </ul>
                                        <ul style="color: var(--text-secondary); line-height: 1.8; margin: 0; padding-left: 1.5rem;">
                                            <li>Memorize key formulas</li>
                                            <li>Practice fault calculations</li>
                                            <li>Study NESC/NEC codes</li>
                                            <li>Review motor starting</li>
                                        </ul>
                                    </div>
                                </div>
                            </div>
                        """)
                    
                    # Interactive Calculator Section
                    gr.HTML("""
                        <div class="feature-card interactive-card">
                            <div class="feature-title">
                                <i class="fas fa-calculator"></i>
                                Quick Power Systems Calculator
                            </div>
                            <div class="feature-description">
                                Built-in calculators for common power systems calculations. Perfect for quick validations and study practice.
                            </div>
                        </div>
                    """)
                    
                    with gr.Row():
                        with gr.Column():
                            calc_voltage = gr.Number(label="⚡ Voltage (V)", value=480)
                            calc_current = gr.Number(label="🔌 Current (A)", value=100)
                            calc_pf = gr.Slider(0.1, 1.0, 0.85, label="📊 Power Factor", step=0.01)
                            calc_btn = gr.Button("🧮 Calculate Power", variant="primary")
                        
                        with gr.Column():
                            calc_results = gr.HTML("""
                                <div style="background: var(--glass-bg); padding: 2rem; border-radius: 15px; border: 1px solid var(--border-color); min-height: 200px; display: flex; align-items: center; justify-content: center;">
                                    <div style="text-align: center; color: var(--text-secondary);">
                                        <i class="fas fa-calculator" style="font-size: 3rem; margin-bottom: 1rem; opacity: 0.5;"></i>
                                        <p>Enter values and click Calculate to see results</p>
                                    </div>
                                </div>
                            """)
                    
                    def calculate_power(voltage, current, pf):
                        if voltage and current and pf:
                            p = (3**0.5) * voltage * current * pf / 1000  # kW
                            q = (3**0.5) * voltage * current * (1-pf**2)**0.5 / 1000  # kVAR
                            s = (3**0.5) * voltage * current / 1000  # kVA
                            
                            return f"""
                                <div style="background: var(--glass-bg); padding: 2rem; border-radius: 15px; border: 1px solid var(--border-color);">
                                    <h4 style="color: var(--text-primary); margin-bottom: 2rem; text-align: center;">
                                        <i class="fas fa-chart-line"></i> Calculation Results
                                    </h4>
                                    <div style="display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem;">
                                        <div style="background: rgba(34, 197, 94, 0.1); padding: 1.5rem; border-radius: 10px; text-align: center;">
                                            <h6 style="color: #22c55e; margin: 0 0 0.5rem 0;">Real Power</h6>
                                            <p style="font-size: 1.5rem; font-weight: 700; margin: 0; color: var(--text-primary);">{p:.2f} kW</p>
                                        </div>
                                        <div style="background: rgba(251, 191, 36, 0.1); padding: 1.5rem; border-radius: 10px; text-align: center;">
                                            <h6 style="color: #fbbf24; margin: 0 0 0.5rem 0;">Reactive Power</h6>
                                            <p style="font-size: 1.5rem; font-weight: 700; margin: 0; color: var(--text-primary);">{q:.2f} kVAR</p>
                                        </div>
                                        <div style="background: rgba(102, 126, 234, 0.1); padding: 1.5rem; border-radius: 10px; text-align: center;">
                                            <h6 style="color: #667eea; margin: 0 0 0.5rem 0;">Apparent Power</h6>
                                            <p style="font-size: 1.5rem; font-weight: 700; margin: 0; color: var(--text-primary);">{s:.2f} kVA</p>
                                        </div>
                                    </div>
                                    <div style="margin-top: 2rem; padding: 1.5rem; background: rgba(255,255,255,0.05); border-radius: 10px;">
                                        <h6 style="color: var(--text-primary); margin: 0 0 1rem 0;">
                                            <i class="fas fa-info-circle"></i> System Parameters
                                        </h6>
                                        <div style="display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; color: var(--text-secondary);">
                                            <div>Line Voltage: {voltage} V</div>
                                            <div>Line Current: {current} A</div>
                                            <div>Power Factor: {pf:.3f} {'(Leading)' if pf > 0.95 else '(Lagging)' if pf < 0.95 else '(Unity)'}</div>
                                            <div>Phase Angle: {(180/3.14159) * ((1-pf**2)**0.5):.1f}°</div>
                                        </div>
                                    </div>
                                </div>
                            """
                        else:
                            return """
                                <div style="background: var(--glass-bg); padding: 2rem; border-radius: 15px; border: 1px solid var(--border-color); min-height: 200px; display: flex; align-items: center; justify-content: center;">
                                    <div style="text-align: center; color: var(--text-secondary);">
                                        <i class="fas fa-exclamation-triangle" style="font-size: 3rem; margin-bottom: 1rem; color: #fbbf24;"></i>
                                        <p>Please enter valid values for voltage, current, and power factor</p>
                                    </div>
                                </div>
                            """
                    
                    calc_btn.click(
                        fn=calculate_power,
                        inputs=[calc_voltage, calc_current, calc_pf],
                        outputs=[calc_results]
                    )
        
        # Event handlers for login with enhanced feedback
        def handle_login(username, password):
            success, user_data, message, sessions_update, main_visibility = login_user(username, password)
            if success:
                welcome_html = f"""
                    <div class="feature-card interactive-card glow-effect" style="text-align: center; background: linear-gradient(135deg, rgba(34, 197, 94, 0.1), rgba(34, 197, 94, 0.05));">
                        <div style="font-size: 4rem; margin-bottom: 1rem;">
                            <i class="fas fa-user-check" style="color: #22c55e;"></i>
                        </div>
                        <h2 style="font-size: 2.5rem; font-weight: 800; background: linear-gradient(135deg, #22c55e, #16a34a); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin: 0;">
                            Welcome back, {user_data['full_name']}! 👋
                        </h2>
                        <p style="color: var(--text-secondary); font-size: 1.2rem; margin: 1rem 0 2rem 0;">
                            Ready to tackle complex power systems challenges? Your AI consultant is ready to help!
                        </p>
                        <div style="display: flex; justify-content: center; gap: 2rem; margin-top: 2rem;">
                            <div style="text-align: center;">
                                <div style="background: rgba(102, 126, 234, 0.1); border-radius: 50%; width: 60px; height: 60px; display: flex; align-items: center; justify-content: center; margin: 0 auto 0.5rem;">
                                    <i class="fas fa-comments" style="color: #667eea; font-size: 1.5rem;"></i>
                                </div>
                                <p style="color: var(--text-secondary); font-size: 0.9rem; margin: 0;">AI Chat Ready</p>
                            </div>
                            <div style="text-align: center;">
                                <div style="background: rgba(118, 75, 162, 0.1); border-radius: 50%; width: 60px; height: 60px; display: flex; align-items: center; justify-content: center; margin: 0 auto 0.5rem;">
                                    <i class="fas fa-chart-line" style="color: #764ba2; font-size: 1.5rem;"></i>
                                </div>
                                <p style="color: var(--text-secondary); font-size: 0.9rem; margin: 0;">Diagrams Available</p>
                            </div>
                            <div style="text-align: center;">
                                <div style="background: rgba(34, 197, 94, 0.1); border-radius: 50%; width: 60px; height: 60px; display: flex; align-items: center; justify-content: center; margin: 0 auto 0.5rem;">
                                    <i class="fas fa-book" style="color: #22c55e; font-size: 1.5rem;"></i>
                                </div>
                                <p style="color: var(--text-secondary); font-size: 0.9rem; margin: 0;">Resources Loaded</p>
                            </div>
                        </div>
                    </div>
                """
                return (
                    message,
                    user_data,
                    gr.update(visible=False),  # Hide login
                    gr.update(visible=True),   # Show main
                    welcome_html,
                    sessions_update
                )
            else:
                return (
                    message,
                    None,
                    gr.update(visible=True),   # Keep login visible
                    gr.update(visible=False),  # Keep main hidden
                    "",
                    gr.update()
                )
        
        def handle_registration(username, email, password, confirm_password, full_name):
            success, message = register_user(username, email, password, confirm_password, full_name)
            return message
        
        def handle_new_chat(user_data):
            if user_data:
                session_id, session_choices = start_new_chat(user_data)
                session_choices_formatted = [(f"💬 {s['title']} ({s['created_at'][:10]})", s['session_id']) 
                                           for s in consultant.user_manager.get_user_sessions(user_data['id'])]
                return (
                    session_id,
                    gr.update(choices=session_choices_formatted, value=session_id),
                    []  # Clear chat history
                )
            return None, gr.update(), []
        
        def handle_chat_selection(session_id, user_data):
            if session_id and user_data:
                history = load_selected_chat(session_id, user_data)
                return history, session_id
            return [], None
        
        def handle_chat_message(message, history, user_data, session_id):
            return chat_interface(message, history, user_data, session_id)
        
        def clear_chat():
            return [], ""
        
        def handle_practice_generation(topic, difficulty, num_questions, user_data):
            return generate_practice_questions(topic, difficulty, num_questions, user_data)
        
        def handle_standard_explanation(standard, user_data):
            return explain_standard_interface(standard, user_data)
        
        # Wire up all event handlers with enhanced interactions
        login_btn.click(
            fn=handle_login,
            inputs=[login_username, login_password],
            outputs=[login_status, user_state, login_section, main_section, user_welcome, chat_sessions_dropdown]
        )
        
        register_btn.click(
            fn=handle_registration,
            inputs=[reg_username, reg_email, reg_password, reg_confirm_password, reg_full_name],
            outputs=[register_status]
        )
        
        new_chat_btn.click(
            fn=handle_new_chat,
            inputs=[user_state],
            outputs=[session_state, chat_sessions_dropdown, chatbot]
        )
        
        chat_sessions_dropdown.change(
            fn=handle_chat_selection,
            inputs=[chat_sessions_dropdown, user_state],
            outputs=[chatbot, session_state]
        )
        
        submit_btn.click(
            fn=handle_chat_message,
            inputs=[msg, chatbot, user_state, session_state],
            outputs=[chatbot, msg, diagram_display]
        )
        
        msg.submit(
            fn=handle_chat_message,
            inputs=[msg, chatbot, user_state, session_state],
            outputs=[chatbot, msg, diagram_display]
        )
        
        clear_btn.click(
            fn=clear_chat,
            outputs=[chatbot, msg]
        )
        
        generate_btn.click(
            fn=handle_practice_generation,
            inputs=[topic_input, difficulty_input, num_questions_input, user_state],
            outputs=[practice_output]
        )
        
        explain_btn.click(
            fn=handle_standard_explanation,
            inputs=[standard_input, user_state],
            outputs=[standard_output]
        )
        
        # Add keyboard shortcuts and enhanced UX
        gr.HTML("""
            <script>
            // Enhanced keyboard shortcuts
            document.addEventListener('keydown', function(e) {
                // Ctrl/Cmd + Enter to send message
                if ((e.ctrlKey || e.metaKey) && e.key === 'Enter') {
                    const sendButton = document.querySelector('button[variant="primary"]');
                    if (sendButton && sendButton.textContent.includes('Send')) {
                        sendButton.click();
                    }
                }
                
                // Escape to clear chat
                if (e.key === 'Escape') {
                    const clearButton = document.querySelector('button[variant="secondary"]');
                    if (clearButton && clearButton.textContent.includes('Clear')) {
                        clearButton.click();
                    }
                }
            });
            
            // Add loading states and animations
            function addLoadingState(element) {
                const originalText = element.textContent;
                element.innerHTML = '<i class="fas fa-spinner fa-spin"></i> Processing...';
                element.disabled = true;
                
                setTimeout(() => {
                    element.innerHTML = originalText;
                    element.disabled = false;
                }, 2000);
            }
            
            // Enhanced visual feedback
            document.addEventListener('click', function(e) {
                if (e.target.matches('button')) {
                    e.target.style.transform = 'scale(0.95)';
                    setTimeout(() => {
                        e.target.style.transform = 'scale(1)';
                    }, 150);
                }
            });
            
            // Smooth scroll to new messages
            const observer = new MutationObserver(function(mutations) {
                mutations.forEach(function(mutation) {
                    if (mutation.addedNodes.length) {
                        const chatContainer = document.querySelector('.gradio-chatbot');
                        if (chatContainer) {
                            chatContainer.scrollTop = chatContainer.scrollHeight;
                        }
                    }
                });
            });
            
            // Auto-focus message input
            setTimeout(() => {
                const messageInput = document.querySelector('textarea[placeholder*="Ask about"]');
                if (messageInput) {
                    messageInput.focus();
                }
            }, 1000);
            
            // Add typing indicator simulation
            function simulateTyping() {
                const typingIndicator = document.createElement('div');
                typingIndicator.innerHTML = `
                    <div style="display: flex; align-items: center; gap: 0.5rem; padding: 1rem; color: var(--text-secondary); font-style: italic;">
                        <div class="loading-spinner"></div>
                        AI Consultant is thinking...
                    </div>
                `;
                return typingIndicator;
            }
            
            // Enhance form validation
            function validateEmail(email) {
                const re = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
                return re.test(email);
            }
            
            // Add real-time form validation
            document.addEventListener('input', function(e) {
                if (e.target.type === 'email') {
                    if (validateEmail(e.target.value)) {
                        e.target.style.borderColor = '#22c55e';
                    } else {
                        e.target.style.borderColor = '#ef4444';
                    }
                }
                
                if (e.target.type === 'password') {
                    if (e.target.value.length >= 6) {
                        e.target.style.borderColor = '#22c55e';
                    } else {
                        e.target.style.borderColor = '#fbbf24';
                    }
                }
            });
            
            // Add tooltips for better UX
            const tooltips = {
                'Practice Pack': 'Generate customized practice questions with detailed solutions',
                'Standards Explorer': 'Get comprehensive explanations of power systems standards',
                'AI Consultant': 'Chat with AI expert for fault analysis and engineering help',
                'Study Resources': 'Access formulas, calculations, and exam preparation materials'
            };
            
            // Progressive loading animation
            function addProgressiveLoading() {
                const cards = document.querySelectorAll('.feature-card');
                cards.forEach((card, index) => {
                    card.style.opacity = '0';
                    card.style.transform = 'translateY(30px)';
                    setTimeout(() => {
                        card.style.transition = 'all 0.6s ease';
                        card.style.opacity = '1';
                        card.style.transform = 'translateY(0)';
                    }, index * 200);
                });
            }
            
            // Initialize progressive loading
            setTimeout(addProgressiveLoading, 500);
            
            // Add particle effects for premium feel
            function createParticle() {
                const particle = document.createElement('div');
                particle.style.position = 'fixed';
                particle.style.width = '4px';
                particle.style.height = '4px';
                particle.style.background = 'linear-gradient(45deg, #667eea, #764ba2)';
                particle.style.borderRadius = '50%';
                particle.style.pointerEvents = 'none';
                particle.style.zIndex = '9999';
                particle.style.opacity = '0.6';
                
                const startX = Math.random() * window.innerWidth;
                const startY = window.innerHeight;
                particle.style.left = startX + 'px';
                particle.style.top = startY + 'px';
                
                document.body.appendChild(particle);
                
                const animation = particle.animate([
                    { transform: 'translateY(0px) translateX(0px)', opacity: 0.6 },
                    { transform: `translateY(-${window.innerHeight + 100}px) translateX(${(Math.random() - 0.5) * 200}px)`, opacity: 0 }
                ], {
                    duration: 3000 + Math.random() * 2000,
                    easing: 'ease-out'
                });
                
                animation.onfinish = () => particle.remove();
            }
            
            // Create particles occasionally for ambiance
            setInterval(() => {
                if (Math.random() < 0.1) createParticle();
            }, 1000);
            
            console.log('🚀 Power Systems Consultant UI Enhanced - Ready for Engineering Excellence!');
            </script>
        """)
    
    return app

# Enhanced launch configuration
if __name__ == "__main__":
    app = create_app()
    
    # Enhanced startup information with modern styling
    print("⚡" * 50)
    print("🚀 POWER SYSTEMS MINI-CONSULTANT v2.0")
    print("⚡" * 50)
    print()
    print("🎨 MODERN UI/UX FEATURES:")
    print("   ✨ Glassmorphism design with dark theme")
    print("   🌈 Dynamic gradients and animations") 
    print("   📱 Fully responsive interface")
    print("   🎯 Interactive elements with hover effects")
    print("   💫 Particle effects and smooth transitions")
    print("   🔥 Real-time form validation")
    print("   ⌨️  Keyboard shortcuts (Ctrl+Enter to send)")
    print()
    print("🔧 CORE FEATURES:")
    print("   🤖 AI-powered chat consultant")
    print("   📊 Professional diagram generation")
    print("   📚 Interactive practice question generator")
    print("   📋 Comprehensive standards explanations")
    print("   🧮 Built-in power calculations")
    print("   💾 User authentication & session management")
    print("   📜 Persistent chat history")
    print("   🎓 Exam preparation resources")
    print()
    
    if consultant is None:
        print("⚠️  WARNING: System not fully initialized")
        print("   Please ensure GROQ_API_KEY is set in environment")
        print("   Some features may not work properly")
        print()
    else:
        print("✅ SYSTEM STATUS: All systems operational!")
        print()
    
    print("🌐 ACCESS INFORMATION:")
    print("   📍 Local URL: http://localhost:7860")
    print("   🔒 Secure authentication required")
    print("   💡 Create account or use existing credentials")
    print()
    print("🎯 GETTING STARTED:")
    print("   1️⃣  Register/Login to access full features")
    print("   2️⃣  Start chatting with AI consultant")
    print("   3️⃣  Try: 'Explain three-phase fault analysis'")
    print("   4️⃣  Generate diagrams: 'Create a single line diagram'")
    print("   5️⃣  Explore practice packs and standards")
    print()
    print("💫 Experience the future of power systems engineering!")
    print("⚡" * 50)
    
    app.launch(
        server_name="0.0.0.0",
        server_port=7860,
        share=False,
        show_api=False,
        show_error=True,
        quiet=False,
        favicon_path=None,
        ssl_verify=False,
        app_kwargs={
            "docs_url": None,
            "redoc_url": None,
        }
    )