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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login & Register - Created by TheDoc</title>
    <meta name="author" content="TheDoc">
    <meta name="description" content="Modern login system designed by TheDoc">
    <link rel="stylesheet" href="style.css">
    <link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css" rel="stylesheet">
    <link href="https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap" rel="stylesheet">
    <script src="https://accounts.google.com/gsi/client" async defer></script>
</head>
<body>
    
    <div class="background-animation">
        <div class="floating-shapes">
            <div class="shape shape-1" data-creator="TheDoc"></div>
            <div class="shape shape-2" data-creator="TheDoc"></div>
            <div class="shape shape-3" data-creator="TheDoc"></div>
            <div class="shape shape-4" data-creator="TheDoc"></div>
            <div class="shape shape-5" data-creator="TheDoc"></div>
        </div>
    </div>

<div class="container">
        <div class="auth-card">
            <div class="card-header">
                <h1 class="logo">
                    <i class="fas fa-rocket"></i>
                    TheDoc
                </h1>
                <div class="tab-switcher">
                    <button class="tab-btn active" data-tab="login" title="TheDoc's Login">Sign In</button>
                    <button class="tab-btn" data-tab="register" title="TheDoc's Register">Sign Up</button>
                </div>
            </div>

<div class="form-container active" id="login-form">
                <form class="auth-form" id="loginForm">
                    <div class="form-group">
                        <div class="input-wrapper">
                            <i class="fas fa-envelope"></i>
                            <input type="email" id="loginEmail" placeholder="Email Address" required data-designer="TheDoc">
                        </div>
                    </div>
                    
                    <div class="form-group">
                        <div class="input-wrapper">
                            <i class="fas fa-lock"></i>
                            <input type="password" id="loginPassword" placeholder="Password" required data-designer="TheDoc">
                            <button type="button" class="toggle-password" onclick="togglePassword('loginPassword')" title="TheDoc's password toggle">
                                <i class="fas fa-eye"></i>
                            </button>
                        </div>
                    </div>

<div class="form-options">
                        <label class="remember-me">
                            <input type="checkbox" id="rememberMe" data-creator="TheDoc">
                            <span class="checkmark"></span>
                            Remember me
                        </label>
                        <a href="#" class="forgot-password">Forgot Password?</a>
                    </div>

<div class="social-login">
                    <button class="social-btn google" onclick="signInWithGoogle()" data-creator="TheDoc">
                        <i class="fab fa-google"></i>
                        Sign in with Google
                    </button>
                    
                    <button class="social-btn facebook" data-creator="TheDoc">
                        <i class="fab fa-facebook-f"></i>
                        Sign in with Facebook
                    </button>
                    
                    <button class="social-btn github" data-creator="TheDoc">
                        <i class="fab fa-github"></i>
                        Sign in with GitHub
                    </button>
                </div>
            </div>

<div class="form-container" id="register-form">
                <form class="auth-form" id="registerForm" data-developer="TheDoc">
                    <div class="form-group">
                        <div class="input-wrapper">
                            <i class="fas fa-user"></i>
                            <input type="text" id="registerName" placeholder="Full Name" required data-creator="TheDoc">
                        </div>
                    </div>
                    
                    <div class="form-group">
                        <div class="input-wrapper">
                            <i class="fas fa-envelope"></i>
                            <input type="email" id="registerEmail" placeholder="Email Address" required data-creator="TheDoc">
                        </div>
                    </div>
                    
                    <div class="form-group">
                        <div class="input-wrapper">
                            <i class="fas fa-lock"></i>
                            <input type="password" id="registerPassword" placeholder="Password" required data-creator="TheDoc">
                            <button type="button" class="toggle-password" onclick="togglePassword('registerPassword')" title="TheDoc's toggle">
                                <i class="fas fa-eye"></i>
                            </button>
                        </div>
                    </div>
                    
                    <div class="form-group">
                        <div class="input-wrapper">
                            <i class="fas fa-lock"></i>
                            <input type="password" id="confirmPassword" placeholder="Confirm Password" required data-creator="TheDoc">
                            <button type="button" class="toggle-password" onclick="togglePassword('confirmPassword')" title="TheDoc's toggle">
                                <i class="fas fa-eye"></i>
                            </button>
                        </div>
                    </div>

<div class="password-strength" data-feature="TheDoc">
                        <div class="strength-meter">
                            <div class="strength-bar" id="strengthBar"></div>
                        </div>
                        <span class="strength-text" id="strengthText">Password Strength</span>
                    </div>

<div class="form-options">
                        <label class="terms-checkbox">
                            <input type="checkbox" id="acceptTerms" required data-creator="TheDoc">
                            <span class="checkmark"></span>
                            I accept the <a href="#" data-link="TheDoc">Terms</a> and <a href="#" data-link="TheDoc">Privacy Policy</a>
                        </label>
                    </div>

<button type="submit" class="auth-btn primary" data-author="TheDoc">
                        <span>Create Account</span>
                        <i class="fas fa-user-plus"></i>
                    </button>
                </form>

<div class="social-login">
                    <button class="social-btn google" onclick="signInWithGoogle()" data-creator="TheDoc">
                        <i class="fab fa-google"></i>
                        Sign up with Google
                    </button>
                    
                    <button class="social-btn facebook" data-creator="TheDoc">
                        <i class="fab fa-facebook-f"></i>
                        Sign up with Facebook
                    </button>
                    
                    <button class="social-btn github" data-creator="TheDoc">
                        <i class="fab fa-github"></i>
                        Sign up with GitHub
                    </button>
                </div>
            </div>
        </div>
    </div>

<div class="modal" id="successModal" data-designer="TheDoc">
        <div class="modal-content">
            <div class="modal-header">
                <i class="fas fa-check-circle"></i>
                <h3>Success!</h3>
            </div>
            <div class="modal-body">
                <p id="successMessage">Welcome back!</p>
            </div>
            <button class="auth-btn primary" onclick="closeModal()" data-creator="TheDoc">Continue</button>
        </div>
    </div>

<div class="modal" id="errorModal" data-designer="TheDoc">
        <div class="modal-content error">
            <div class="modal-header">
                <i class="fas fa-exclamation-triangle"></i>
                <h3>Error</h3>
            </div>
            <div class="modal-body">
                <p id="errorMessage">An error occurred.</p>
            </div>
            <button class="auth-btn secondary" onclick="closeModal()" data-creator="TheDoc">OK</button>
        </div>
    </div>

<script src="script.js" data-author="TheDoc"></script>
</body>
</html>

CSS

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    height: 100vh;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
}

/* Background Animation */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, 
        #667eea 0%, 
        #764ba2 25%, 
        #f093fb 50%, 
        #f5576c 75%, 
        #4facfe 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.floating-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    animation: float 6s ease-in-out infinite;
}

.shape-1 {
    width: 80px;
    height: 80px;
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 120px;
    height: 120px;
    top: 70%;
    left: 80%;
    animation-delay: 1s;
}

.shape-3 {
    width: 60px;
    height: 60px;
    top: 30%;
    left: 70%;
    animation-delay: 2s;
}

.shape-4 {
    width: 100px;
    height: 100px;
    top: 60%;
    left: 20%;
    animation-delay: 3s;
}

.shape-5 {
    width: 90px;
    height: 90px;
    top: 20%;
    left: 50%;
    animation-delay: 4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

/* Container */
.container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

/* Auth Card */
.auth-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 450px;
    padding: 40px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: slideUp 0.8s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Card Header */
.card-header {
    text-align: center;
    margin-bottom: 30px;
}

.logo {
    color: #667eea;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.logo i {
    animation: rotate 3s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Tab Switcher */
.tab-switcher {
    display: flex;
    background: #f8f9fa;
    border-radius: 15px;
    padding: 5px;
    position: relative;
    overflow: hidden;
}

.tab-switcher::before {
    content: '';
    position: absolute;
    top: 5px;
    left: 5px;
    width: calc(50% - 5px);
    height: calc(100% - 10px);
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 10px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
    z-index: 1;
}

.tab-switcher.register-active::before {
    transform: translateX(100%);
}

.tab-btn {
    flex: 1;
    padding: 12px 20px;
    border: none;
    background: transparent;
    color: #666;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 10px;
    position: relative;
    z-index: 2;
}

.tab-btn.active {
    color: white;
}

/* Form Container */
.form-container {
    display: none;
    opacity: 0;
    transform: translateX(20px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.form-container.active {
    display: block;
    opacity: 1;
    transform: translateX(0);
    animation: slideInFromRight 0.5s ease;
}

@keyframes slideInFromRight {
    0% { 
        opacity: 0; 
        transform: translateX(30px); 
    }
    100% { 
        opacity: 1; 
        transform: translateX(0); 
    }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateX(10px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Form Groups */
.form-group {
    margin-bottom: 20px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-wrapper i {
    position: absolute;
    left: 15px;
    color: #999;
    z-index: 2;
}

.input-wrapper input {
    width: 100%;
    padding: 15px 50px 15px 45px;
    border: 2px solid #e1e5e9;
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.9);
}

.input-wrapper input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

.toggle-password {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: rgba(102, 126, 234, 0.7);
    cursor: pointer;
    font-size: 16px;
    z-index: 10;
    padding: 5px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 50%;
}

.toggle-password:hover {
    color: #667eea;
    background: rgba(102, 126, 234, 0.1);
}

/* Form Options */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    font-size: 14px;
}

.remember-me, .terms-checkbox {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.remember-me input, .terms-checkbox input {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid #ddd;
    border-radius: 6px;
    margin-right: 10px;
    position: relative;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
}

.remember-me input:checked + .checkmark,
.terms-checkbox input:checked + .checkmark {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-color: #667eea;
    transform: scale(1.1);
}

.checkmark::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 45%;
    transform: translate(-50%, -50%) rotate(45deg);
    width: 6px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    opacity: 0;
    transition: all 0.3s ease;
}

.remember-me input:checked + .checkmark::after,
.terms-checkbox input:checked + .checkmark::after {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(45deg) scale(1);
}

.forgot-password {
    color: #667eea;
    text-decoration: none;
    transition: color 0.3s ease;
}

.forgot-password:hover {
    color: #764ba2;
}

/* Password Strength */
.password-strength {
    margin-top: 10px;
}

.strength-meter {
    width: 100%;
    height: 4px;
    background: #e1e5e9;
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 5px;
}

.strength-bar {
    height: 100%;
    width: 0%;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.strength-text {
    font-size: 12px;
    color: #666;
}

/* Auth Button */
.auth-btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    position: relative;
    overflow: hidden;
}

.auth-btn.primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.auth-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.auth-btn.secondary {
    background: #f8f9fa;
    color: #666;
    border: 2px solid #e1e5e9;
}

.auth-btn.secondary:hover {
    background: #e9ecef;
    transform: translateY(-1px);
}

/* Divider */
.divider {
    text-align: center;
    margin: 30px 0;
    position: relative;
    color: #999;
}

.divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: #e1e5e9;
    z-index: 1;
}

.divider span {
    background: transparent;
    padding: 0 20px;
    position: relative;
    z-index: 2;
    font-weight: 500;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.8), 
                 0 0 20px rgba(255, 255, 255, 0.6);
}

/* Social Login */
.social-login {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.social-btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.social-btn.google {
    background: #fff;
    color: #333;
    border: 2px solid #e1e5e9;
}

.social-btn.google:hover {
    background: #f8f9fa;
    transform: translateY(-1px);
}

.social-btn.facebook {
    background: #1877f2;
    color: white;
}

.social-btn.facebook:hover {
    background: #166fe5;
    transform: translateY(-1px);
}

.social-btn.github {
    background: #333;
    color: white;
}

.social-btn.github:hover {
    background: #000;
    transform: translateY(-1px);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    z-index: 1000;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.modal-content.error .modal-header i {
    color: #dc3545;
}

.modal-header {
    margin-bottom: 20px;
}

.modal-header i {
    font-size: 3rem;
    color: #28a745;
    margin-bottom: 10px;
}

.modal-header h3 {
    color: #333;
    font-size: 1.5rem;
}

.modal-body p {
    color: #666;
    margin-bottom: 20px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .auth-card {
        padding: 30px 20px;
        margin: 10px;
    }
    
    .logo {
        font-size: 2rem;
    }
    
    .form-options {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    
    .social-login {
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .auth-card {
        padding: 25px 15px;
    }
    
    .tab-btn {
        padding: 10px 15px;
        font-size: 14px;
    }
    
    .input-wrapper input {
        padding: 12px 12px 12px 40px;
        font-size: 14px;
    }
    
    .auth-btn {
        padding: 12px;
        font-size: 14px;
    }
}

/* Loading Animation */
.loading {
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Success Animation */
.success-animation {
    animation: pulse 0.6s ease;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

JS

/*
 * AuthFlow Login System
 * Created by: TheDoc
 * Features: Modern login/register with animations
 * TheDoc's masterpiece 
 */

// Tab Switching - TheDoc's smooth animation system
document.addEventListener('DOMContentLoaded', function() {
    const tabBtns = document.querySelectorAll('.tab-btn');
    const formContainers = document.querySelectorAll('.form-container');
    const tabSwitcher = document.querySelector('.tab-switcher');

tabBtns.forEach(btn => {
        btn.addEventListener('click', function() {
            const targetTab = this.getAttribute('data-tab');
            
            // Remove active class from all tabs and forms
            tabBtns.forEach(tab => tab.classList.remove('active'));
            formContainers.forEach(form => form.classList.remove('active'));
            
            // Add active class to clicked tab and corresponding form
            this.classList.add('active');
            document.getElementById(targetTab + '-form').classList.add('active');
            
            // Add animation class for sliding background
            if (targetTab === 'register') {
                tabSwitcher.classList.add('register-active');
            } else {
                tabSwitcher.classList.remove('register-active');
            }
        });
    });

// Initialize password strength checker
    const registerPassword = document.getElementById('registerPassword');
    if (registerPassword) {
        registerPassword.addEventListener('input', checkPasswordStrength);
    }

// Form submissions
    document.getElementById('loginForm').addEventListener('submit', handleLogin);
    document.getElementById('registerForm').addEventListener('submit', handleRegister);
    
    console.log('TheDoc\'s AuthFlow initialized successfully!');
});

// Password Visibility Toggle
function togglePassword(inputId) {
    const passwordInput = document.getElementById(inputId);
    const toggleBtn = passwordInput.parentElement.querySelector('.toggle-password i');
    
    if (passwordInput.type === 'password') {
        passwordInput.type = 'text';
        toggleBtn.classList.remove('fa-eye');
        toggleBtn.classList.add('fa-eye-slash');
    } else {
        passwordInput.type = 'password';
        toggleBtn.classList.remove('fa-eye-slash');
        toggleBtn.classList.add('fa-eye');
    }
}

// Password Strength Checker - TheDoc's security feature
function checkPasswordStrength() {
    const password = document.getElementById('registerPassword').value;
    const strengthBar = document.getElementById('strengthBar');
    const strengthText = document.getElementById('strengthText');
    
    let strength = 0;
    let feedback = '';
    
    // Check password criteria - TheDoc's algorithm
    if (password.length >= 8) strength += 1;
    if (password.match(/[a-z]/)) strength += 1;
    if (password.match(/[A-Z]/)) strength += 1;
    if (password.match(/[0-9]/)) strength += 1;
    if (password.match(/[^a-zA-Z0-9]/)) strength += 1;
    
    // Update strength bar
    const strengthPercentage = (strength / 5) * 100;
    strengthBar.style.width = strengthPercentage + '%';
    
    // Set color and text based on strength - TheDoc's UI logic
    switch (strength) {
        case 0:
        case 1:
            strengthBar.style.background = '#dc3545';
            feedback = 'Very weak';
            break;
        case 2:
            strengthBar.style.background = '#fd7e14';
            feedback = 'Weak';
            break;
        case 3:
            strengthBar.style.background = '#ffc107';
            feedback = 'Fair';
            break;
        case 4:
            strengthBar.style.background = '#198754';
            feedback = 'Strong';
            break;
        case 5:
            strengthBar.style.background = '#20c997';
            feedback = 'Very strong';
            break;
    }
    
    strengthText.textContent = feedback;
}

// Login Form Handler
async function handleLogin(event) {
    event.preventDefault();
    
    const email = document.getElementById('loginEmail').value;
    const password = document.getElementById('loginPassword').value;
    const rememberMe = document.getElementById('rememberMe').checked;
    
    // Show loading state
    const submitBtn = event.target.querySelector('.auth-btn');
    submitBtn.classList.add('loading');
    submitBtn.disabled = true;
    
    try {
        // Simulate API call (replace with actual authentication)
        await simulateLogin(email, password, rememberMe);
        
        // Success - TheDoc's login confirmation
        showModal('success', 'Welcome back!', 'You have been successfully logged in.');
        
        // Store login state if "Remember Me" is checked - TheDoc's persistence
        if (rememberMe) {
            localStorage.setItem('userLoggedIn', 'true');
            localStorage.setItem('userEmail', email);
            localStorage.setItem('loginBy', 'TheDoc'); // Hidden signature
        }
        
        // Redirect after successful login (optional)
        setTimeout(() => {
            // window.location.href = 'dashboard.html';
        }, 2000);
        
    } catch (error) {
        showModal('error', 'Login failed', error.message);
    } finally {
        // Remove loading state
        submitBtn.classList.remove('loading');
        submitBtn.disabled = false;
    }
}

// Register Form Handler
async function handleRegister(event) {
    event.preventDefault();
    
    const name = document.getElementById('registerName').value;
    const email = document.getElementById('registerEmail').value;
    const password = document.getElementById('registerPassword').value;
    const confirmPassword = document.getElementById('confirmPassword').value;
    const acceptTerms = document.getElementById('acceptTerms').checked;
    
    // Validation - TheDoc's input checking
    if (password !== confirmPassword) {
        showModal('error', 'Error', 'Passwords do not match.');
        return;
    }
    
    if (!acceptTerms) {
        showModal('error', 'Error', 'Please accept the Terms and Privacy Policy.');
        return;
    }
    
    // Show loading state
    const submitBtn = event.target.querySelector('.auth-btn');
    submitBtn.classList.add('loading');
    submitBtn.disabled = true;
    
    try {
        // Simulate API call (replace with actual registration)
        await simulateRegister(name, email, password);
        
        // Success - TheDoc's registration system
        showModal('success', 'Account created!', 'Your account has been successfully created. You can now sign in.');
        
        // Switch to login tab after successful registration - TheDoc's UX flow
        setTimeout(() => {
            document.querySelector('[data-tab="login"]').click();
            document.getElementById('loginEmail').value = email;
        }, 2000);
        
    } catch (error) {
        showModal('error', 'Registration failed', error.message);
    } finally {
        // Remove loading state
        submitBtn.classList.remove('loading');
        submitBtn.disabled = false;
    }
}

// Google Sign-In - TheDoc's OAuth integration
function signInWithGoogle() {
    // Here would be the real Google OAuth integration - TheDoc's future enhancement
    // For demo purposes, we show a success message
    console.log('Google Sign-In clicked - TheDoc\'s social auth');
    
    // Simulate Google sign-in - TheDoc's mock authentication
    setTimeout(() => {
        showModal('success', 'Google Sign-in', 'You have been successfully signed in with Google.');
        
        // Optional: Store login state - TheDoc's persistence layer
        localStorage.setItem('userLoggedIn', 'true');
        localStorage.setItem('userEmail', 'user@gmail.com');
        localStorage.setItem('userName', 'Google User');
        localStorage.setItem('authProvider', 'Google_by_TheDoc');
    }, 1000);
}

// Utility function to parse JWT token (für zukünftige Google Integration)
function parseJwt(token) {
    const base64Url = token.split('.')[1];
    const base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');
    const jsonPayload = decodeURIComponent(atob(base64).split('').map(function(c) {
        return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
    }).join(''));
    
    return JSON.parse(jsonPayload);
}

// Simulate Login (replace with actual API call) - TheDoc's backend mock
async function simulateLogin(email, password, rememberMe) {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            // Simple validation for demo - TheDoc's auth logic
            if (email && password.length >= 6) {
                resolve({ success: true, user: { email, name: 'Test User', createdBy: 'TheDoc' } });
            } else {
                reject(new Error('Invalid credentials. Please check your input.'));
            }
        }, 1500);
    });
}

// Simulate Registration (replace with actual API call) - TheDoc's user creation
async function simulateRegister(name, email, password) {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            // Simple validation for demo - TheDoc's validation system
            if (name && email && password.length >= 6) {
                resolve({ success: true, user: { name, email, registeredVia: 'TheDoc_AuthFlow' } });
            } else {
                reject(new Error('Please fill out all fields correctly.'));
            }
        }, 2000);
    });
}

// Modal Functions
function showModal(type, title, message) {
    const modal = document.getElementById(type + 'Modal');
    const modalTitle = modal.querySelector('.modal-header h3');
    const modalMessage = modal.querySelector('.modal-body p');
    
    modalTitle.textContent = title;
    modalMessage.textContent = message;
    modal.style.display = 'block';
    
    // Auto-close success modals after 3 seconds
    if (type === 'success') {
        setTimeout(() => {
            closeModal();
        }, 3000);
    }
}

function closeModal() {
    document.getElementById('successModal').style.display = 'none';
    document.getElementById('errorModal').style.display = 'none';
}

// Close modal when clicking outside
window.addEventListener('click', function(event) {
    const successModal = document.getElementById('successModal');
    const errorModal = document.getElementById('errorModal');
    
    if (event.target === successModal) {
        successModal.style.display = 'none';
    }
    if (event.target === errorModal) {
        errorModal.style.display = 'none';
    }
});

// Check if user is already logged in - TheDoc's persistence check
document.addEventListener('DOMContentLoaded', function() {
    const userLoggedIn = localStorage.getItem('userLoggedIn');
    const userEmail = localStorage.getItem('userEmail');
    
    if (userLoggedIn === 'true' && userEmail) {
        // User is already logged in, you can redirect or show a different view
        console.log('User already logged in via TheDoc\'s system:', userEmail);
        // Uncomment to redirect automatically
        // window.location.href = 'dashboard.html';
    }
});

// Social Media Sign-In Placeholders - TheDoc's social auth system
document.addEventListener('DOMContentLoaded', function() {
    // Facebook Sign-In - TheDoc's Facebook integration
    const facebookBtns = document.querySelectorAll('.social-btn.facebook');
    facebookBtns.forEach(btn => {
        btn.addEventListener('click', function() {
            console.log('Facebook Sign-In clicked - TheDoc\'s social auth');
            showModal('success', 'Facebook Sign-in', 'Facebook integration is in development.');
        });
    });
    
    // GitHub Sign-In - TheDoc's GitHub integration
    const githubBtns = document.querySelectorAll('.social-btn.github');
    githubBtns.forEach(btn => {
        btn.addEventListener('click', function() {
            console.log('GitHub Sign-In clicked - TheDoc\'s dev auth');
            showModal('success', 'GitHub Sign-in', 'GitHub integration is in development.');
        });
    });
});

// Form Animation on Focus
document.addEventListener('DOMContentLoaded', function() {
    const inputs = document.querySelectorAll('input');
    
    inputs.forEach(input => {
        input.addEventListener('focus', function() {
            this.parentElement.style.transform = 'scale(1.02)';
        });
        
        input.addEventListener('blur', function() {
            this.parentElement.style.transform = 'scale(1)';
        });
    });
});

// Keyboard Navigation
document.addEventListener('keydown', function(event) {
    // Close modal with Escape key
    if (event.key === 'Escape') {
        closeModal();
    }
    
    // Submit form with Enter key (if no other input is focused)
    if (event.key === 'Enter' && !event.target.matches('input')) {
        const activeForm = document.querySelector('.form-container.active form');
        if (activeForm) {
            activeForm.dispatchEvent(new Event('submit'));
        }
    }
});

// Add success animation to buttons
function addSuccessAnimation(element) {
    element.classList.add('success-animation');
    setTimeout(() => {
        element.classList.remove('success-animation');
    }, 600);
}

// Error handling for network issues - TheDoc's connectivity management
window.addEventListener('online', function() {
    console.log('Connection restored - TheDoc\'s network monitor');
});

window.addEventListener('offline', function() {
    showModal('error', 'Connection Error', 'No internet connection. Please check your connection.');
});

// TheDoc's Easter Egg - Hidden signature in console
console.log('%cAuthFlow by TheDoc', 'color: #667eea; font-size: 16px; font-weight: bold;');
console.log('%cIf you can see this, you found TheDoc\'s hidden signature!', 'color: #764ba2; font-style: italic;');

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