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HTML

<!DOCTYPE html>
<html lang="tr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Neon Login & Signup</title>
    
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
    
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.7.2/css/all.min.css">
    
    <link href="https://fonts.googleapis.com/css2?family=Orbitron:wght@400;700;900&family=Rajdhani:wght@300;400;500;600;700&display=swap" rel="stylesheet">
    
    <style>
        :root {
            --neon-red: #ff0040;
            --neon-pink: #ff1744;
            --neon-crimson: #dc143c;
            --electric-red: #ff073a;
            --dark-bg: #0a0a0a;
            --darker-bg: #050505;
            --glass-bg: rgba(255, 0, 64, 0.1);
            --glass-border: rgba(255, 23, 68, 0.3);
            --text-primary: #ffffff;
            --text-secondary: #cccccc;
            --text-muted: #888888;
            --success-neon: #00ff88;
            --warning-neon: #ffaa00;
            --gradient-main: linear-gradient(135deg, #ff0040 0%, #ff1744 50%, #dc143c 100%);
            --gradient-glass: linear-gradient(135deg, rgba(255, 0, 64, 0.2) 0%, rgba(255, 23, 68, 0.1) 100%);
            --shadow-neon: 0 0 20px rgba(255, 0, 64, 0.5);
            --shadow-strong: 0 0 40px rgba(255, 0, 64, 0.8);
            --border-radius: 16px;
            --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

body {
            font-family: 'Rajdhani', sans-serif;
            background: var(--dark-bg);
            min-height: 100vh;
            overflow-x: hidden;
            position: relative;
        }

/* Animated Background */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: 
                radial-gradient(circle at 20% 80%, rgba(255, 0, 64, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(255, 23, 68, 0.3) 0%, transparent 50%),
                radial-gradient(circle at 40% 40%, rgba(220, 20, 60, 0.2) 0%, transparent 50%);
            animation: bgShift 8s ease-in-out infinite alternate;
            z-index: -1;
        }

@keyframes bgShift {
            0% { transform: scale(1) rotate(0deg); }
            100% { transform: scale(1.1) rotate(5deg); }
        }

.container-fluid {
            padding: 20px;
            position: relative;
            z-index: 1;
        }

/* Main Container */
        .auth-container {
            background: var(--glass-bg);
            backdrop-filter: blur(20px);
            border: 2px solid var(--glass-border);
            border-radius: 24px;
            box-shadow: var(--shadow-neon);
            overflow: hidden;
            max-width: 1200px;
            width: 100%;
            min-height: 700px;
            position: relative;
            animation: glow 3s ease-in-out infinite alternate;
        }

@keyframes glow {
            0% { box-shadow: var(--shadow-neon); }
            100% { box-shadow: var(--shadow-strong); }
        }

/* Toggle Buttons */
        .auth-toggle {
            position: absolute;
            top: 30px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 10;
            display: flex;
            background: rgba(0, 0, 0, 0.7);
            border-radius: 50px;
            padding: 5px;
            border: 1px solid var(--glass-border);
        }

.toggle-btn {
            background: transparent;
            border: none;
            color: var(--text-secondary);
            padding: 12px 30px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            font-family: 'Orbitron', monospace;
        }

.toggle-btn.active {
            background: var(--gradient-main);
            color: var(--text-primary);
            box-shadow: 0 0 15px rgba(255, 0, 64, 0.6);
            text-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
        }

/* Cyber Grid Background */
        .cyber-grid {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: 
                linear-gradient(rgba(255, 0, 64, 0.1) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 0, 64, 0.1) 1px, transparent 1px);
            background-size: 50px 50px;
            animation: gridMove 20s linear infinite;
            opacity: 0.3;
        }

@keyframes gridMove {
            0% { transform: translate(0, 0); }
            100% { transform: translate(50px, 50px); }
        }

/* Form Sections */
        .form-section {
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 80px 40px 40px;
            min-height: 700px;
            position: relative;
        }

.form-container {
            width: 100%;
            max-width: 450px;
            opacity: 0;
            transform: translateY(30px);
            transition: var(--transition);
        }

.form-container.active {
            opacity: 1;
            transform: translateY(0);
        }

/* Neon Headers */
        .neon-title {
            font-family: 'Orbitron', monospace;
            font-size: 48px;
            font-weight: 900;
            text-align: center;
            margin-bottom: 10px;
            background: var(--gradient-main);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: 0 0 30px rgba(255, 0, 64, 0.8);
            animation: neonPulse 2s ease-in-out infinite alternate;
        }

@keyframes neonPulse {
            0% { 
                filter: brightness(1);
                text-shadow: 0 0 30px rgba(255, 0, 64, 0.8);
            }
            100% { 
                filter: brightness(1.2);
                text-shadow: 0 0 40px rgba(255, 0, 64, 1);
            }
        }

.neon-subtitle {
            font-size: 18px;
            color: var(--text-secondary);
            text-align: center;
            margin-bottom: 40px;
            font-weight: 400;
        }

/* Cyber Form Groups */
        .cyber-form-group {
            margin-bottom: 25px;
            position: relative;
        }

.cyber-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--neon-red);
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 1px;
            font-family: 'Orbitron', monospace;
        }

.cyber-input-group {
            position: relative;
            display: flex;
            border-radius: var(--border-radius);
            overflow: hidden;
            background: rgba(0, 0, 0, 0.6);
            border: 2px solid var(--glass-border);
            transition: var(--transition);
        }

.cyber-input-group:focus-within {
            border-color: var(--neon-red);
            box-shadow: 0 0 20px rgba(255, 0, 64, 0.4);
            transform: scale(1.02);
        }

.cyber-input-icon {
            background: var(--glass-bg);
            border: none;
            color: var(--neon-red);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 50px;
            font-size: 16px;
            transition: var(--transition);
        }

.cyber-input-group:focus-within .cyber-input-icon {
            color: var(--text-primary);
            background: var(--neon-red);
            box-shadow: 0 0 15px rgba(255, 0, 64, 0.6);
        }

.cyber-input {
            border: none;
            padding: 16px 20px;
            font-size: 16px;
            background: transparent;
            color: var(--text-primary);
            transition: var(--transition);
            flex: 1;
            font-family: 'Rajdhani', sans-serif;
            font-weight: 500;
        }

.cyber-input:focus {
            outline: none;
            background: rgba(255, 0, 64, 0.05);
        }

.cyber-input::placeholder {
            color: var(--text-muted);
            opacity: 0.8;
        }

/* Neon Button */
        .neon-btn {
            width: 100%;
            background: var(--gradient-main);
            border: none;
            border-radius: var(--border-radius);
            padding: 18px;
            color: var(--text-primary);
            font-size: 18px;
            font-weight: 700;
            font-family: 'Orbitron', monospace;
            text-transform: uppercase;
            letter-spacing: 2px;
            cursor: pointer;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
            box-shadow: 0 0 25px rgba(255, 0, 64, 0.5);
        }

.neon-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 0 35px rgba(255, 0, 64, 0.8);
            filter: brightness(1.1);
        }

.neon-btn:active {
            transform: translateY(0);
        }

.neon-btn::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
            transition: var(--transition);
        }

.neon-btn:hover::before {
            left: 100%;
        }

/* Form Options */
        .cyber-options {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin: 20px 0 30px;
            font-size: 14px;
        }

.cyber-checkbox {
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text-secondary);
        }

.cyber-checkbox input[type="checkbox"] {
            appearance: none;
            width: 18px;
            height: 18px;
            border: 2px solid var(--neon-red);
            border-radius: 4px;
            position: relative;
            cursor: pointer;
            transition: var(--transition);
        }

.cyber-checkbox input[type="checkbox"]:checked {
            background: var(--neon-red);
            box-shadow: 0 0 10px rgba(255, 0, 64, 0.6);
        }

.cyber-checkbox input[type="checkbox"]:checked::after {
            content: '✓';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            color: white;
            font-size: 12px;
            font-weight: bold;
        }

.cyber-link {
            color: var(--neon-red);
            text-decoration: none;
            font-weight: 600;
            transition: var(--transition);
        }

.cyber-link:hover {
            color: var(--text-primary);
            text-shadow: 0 0 10px rgba(255, 0, 64, 0.8);
        }

/* Social Login */
        .cyber-divider {
            text-align: center;
            margin: 30px 0;
            position: relative;
        }

.cyber-divider::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--neon-red), transparent);
        }

.cyber-divider span {
            background: var(--dark-bg);
            padding: 0 20px;
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
        }

.social-cyber {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 15px;
            margin-bottom: 30px;
        }

.social-cyber-btn {
            border: 2px solid var(--glass-border);
            background: var(--glass-bg);
            border-radius: var(--border-radius);
            padding: 12px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 8px;
            cursor: pointer;
            transition: var(--transition);
            font-size: 12px;
            font-weight: 600;
            color: var(--text-secondary);
        }

.social-cyber-btn:hover {
            border-color: var(--neon-red);
            background: rgba(255, 0, 64, 0.1);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(255, 0, 64, 0.3);
            color: var(--text-primary);
        }

.social-cyber-btn i {
            font-size: 20px;
        }

/* Bottom Link */
        .bottom-link {
            text-align: center;
            color: var(--text-secondary);
            font-size: 14px;
        }

.cyber-switch-link {
            color: var(--neon-red);
            text-decoration: none;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }

.cyber-switch-link:hover {
            color: var(--text-primary);
            text-shadow: 0 0 10px var(--neon-red);
        }

/* Password Toggle */
        .password-toggle {
            cursor: pointer;
            background: var(--glass-bg);
            transition: var(--transition);
            color: var(--text-muted);
        }

.password-toggle:hover {
            color: var(--neon-red);
            background: rgba(255, 0, 64, 0.1);
        }

/* Loading Animation */
        .neon-btn.loading {
            pointer-events: none;
            opacity: 0.7;
        }

.neon-btn.loading::after {
            content: '';
            width: 20px;
            height: 20px;
            border: 2px solid transparent;
            border-top: 2px solid var(--text-primary);
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin-left: 10px;
            display: inline-block;
        }

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

/* Responsive Design */
        @media (max-width: 768px) {
            .auth-container {
                margin: 10px;
                border-radius: 20px;
                min-height: 600px;
            }
            
            .form-section {
                padding: 100px 20px 20px;
            }
            
            .neon-title {
                font-size: 36px;
            }
            
            .auth-toggle {
                top: 20px;
            }
            
            .toggle-btn {
                padding: 10px 20px;
                font-size: 14px;
            }
            
            .social-cyber {
                grid-template-columns: 1fr;
            }
        }

@media (max-width: 480px) {
            .neon-title {
                font-size: 28px;
            }
            
            .cyber-input {
                padding: 14px 16px;
                font-size: 14px;
            }
            
            .neon-btn {
                padding: 16px;
                font-size: 16px;
            }
        }

/* Success/Error States */
        .cyber-input.success {
            border-color: var(--success-neon);
            box-shadow: 0 0 15px rgba(0, 255, 136, 0.3);
        }

.cyber-input.error {
            border-color: var(--warning-neon);
            box-shadow: 0 0 15px rgba(255, 170, 0, 0.3);
        }

/* Toast Notification */
        .cyber-toast {
            position: fixed;
            top: 20px;
            right: 20px;
            background: var(--glass-bg);
            backdrop-filter: blur(20px);
            border: 1px solid var(--glass-border);
            border-radius: var(--border-radius);
            padding: 16px 20px;
            color: var(--text-primary);
            font-weight: 500;
            z-index: 9999;
            animation: slideInRight 0.4s ease-out;
            box-shadow: var(--shadow-neon);
        }

@keyframes slideInRight {
            from {
                transform: translateX(100%);
                opacity: 0;
            }
            to {
                transform: translateX(0);
                opacity: 1;
            }
        }
    </style>
</head>
<body>
    <div class="container-fluid min-vh-100 d-flex align-items-center justify-content-center">
        <div class="auth-container">
            <div class="cyber-grid"></div>
            
            
            <div class="auth-toggle">
                <button class="toggle-btn active" onclick="showLogin()">Giriş Yap</button>
                <button class="toggle-btn" onclick="showSignup()">Üye Ol</button>
            </div>

<div class="form-section" id="loginSection">
                <div class="form-container active">
                    <div class="text-center mb-4">
                        <h1 class="neon-title">GİRİŞ</h1>
                        <p class="neon-subtitle">Hesabınıza giriş yapın</p>
                    </div>

<form id="loginForm">
                        
                        <div class="cyber-form-group">
                            <label class="cyber-label">E-mail Adresi</label>
                            <div class="cyber-input-group">
                                <span class="cyber-input-icon">
                                    <i class="fas fa-envelope"></i>
                                </span>
                                <input type="email" class="cyber-input" placeholder="E-mail adresinizi girin" required>
                            </div>
                        </div>

<div class="cyber-form-group">
                            <label class="cyber-label">Şifre</label>
                            <div class="cyber-input-group">
                                <span class="cyber-input-icon">
                                    <i class="fas fa-lock"></i>
                                </span>
                                <input type="password" class="cyber-input" id="loginPassword" placeholder="Şifrenizi girin" required>
                                <span class="cyber-input-icon password-toggle" onclick="togglePassword('loginPassword', this)">
                                    <i class="fas fa-eye"></i>
                                </span>
                            </div>
                        </div>

<div class="cyber-options">
                            <label class="cyber-checkbox">
                                <input type="checkbox" id="rememberLogin">
                                Beni Hatırla
                            </label>
                            <a href="#" class="cyber-link">Şifremi Unuttum?</a>
                        </div>

<button type="submit" class="neon-btn">
                            Giriş Yap
                        </button>

<div class="cyber-divider">
                            <span>veya devam et</span>
                        </div>

<div class="social-cyber">
                            <button type="button" class="social-cyber-btn" onclick="handleSocialLogin('Google')">
                                <i class="fab fa-google"></i>
                                <span>Google</span>
                            </button>
                            <button type="button" class="social-cyber-btn" onclick="handleSocialLogin('Facebook')">
                                <i class="fab fa-facebook-f"></i>
                                <span>Facebook</span>
                            </button>
                            <button type="button" class="social-cyber-btn" onclick="handleSocialLogin('Apple')">
                                <i class="fab fa-apple"></i>
                                <span>Apple</span>
                            </button>
                        </div>

<div class="bottom-link">
                            Hesabınız yok mu? <span class="cyber-switch-link" onclick="showSignup()">Üye Ol</span>
                        </div>
                    </form>
                </div>
            </div>

<div class="form-section" id="signupSection" style="display: none;">
                <div class="form-container">
                    <div class="text-center mb-4">
                        <h1 class="neon-title">ÜYE OL</h1>
                        <p class="neon-subtitle">Yeni hesabınızı oluşturun</p>
                    </div>

<form id="signupForm">
                        
                        <div class="cyber-form-group">
                            <label class="cyber-label">Ad Soyad</label>
                            <div class="cyber-input-group">
                                <span class="cyber-input-icon">
                                    <i class="fas fa-user"></i>
                                </span>
                                <input type="text" class="cyber-input" placeholder="Ad ve soyadınızı girin" required>
                            </div>
                        </div>

<div class="cyber-form-group">
                            <label class="cyber-label">E-mail Adresi</label>
                            <div class="cyber-input-group">
                                <span class="cyber-input-icon">
                                    <i class="fas fa-envelope"></i>
                                </span>
                                <input type="email" class="cyber-input" placeholder="E-mail adresinizi girin" required>
                            </div>
                        </div>

<div class="cyber-form-group">
                            <label class="cyber-label">Şifre</label>
                            <div class="cyber-input-group">
                                <span class="cyber-input-icon">
                                    <i class="fas fa-lock"></i>
                                </span>
                                <input type="password" class="cyber-input" id="signupPassword" placeholder="Şifrenizi girin" required>
                                <span class="cyber-input-icon password-toggle" onclick="togglePassword('signupPassword', this)">
                                    <i class="fas fa-eye"></i>
                                </span>
                            </div>
                        </div>

<div class="cyber-form-group">
                            <label class="cyber-label">Şifre Tekrar</label>
                            <div class="cyber-input-group">
                                <span class="cyber-input-icon">
                                    <i class="fas fa-lock"></i>
                                </span>
                                <input type="password" class="cyber-input" id="confirmPassword" placeholder="Şifrenizi tekrar girin" required>
                                <span class="cyber-input-icon password-toggle" onclick="togglePassword('confirmPassword', this)">
                                    <i class="fas fa-eye"></i>
                                </span>
                            </div>
                        </div>

<div class="cyber-options">
                            <label class="cyber-checkbox">
                                <input type="checkbox" id="agreeTerms" required>
                                <a href="#" class="cyber-link">Kullanım Şartları</a>'nı kabul ediyorum
                            </label>
                        </div>

<button type="submit" class="neon-btn">
                            Hesap Oluştur
                        </button>

<div class="cyber-divider">
                            <span>veya devam et</span>
                        </div>

<div class="bottom-link">
                            Zaten hesabınız var mı? <span class="cyber-switch-link" onclick="showLogin()">Giriş Yap</span>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
    
    <script>
        // Form switching functionality
        function showLogin() {
            document.getElementById('loginSection').style.display = 'flex';
            document.getElementById('signupSection').style.display = 'none';
            
            // Update toggle buttons
            document.querySelectorAll('.toggle-btn').forEach(btn => btn.classList.remove('active'));
            document.querySelectorAll('.toggle-btn')[0].classList.add('active');
            
            // Animate form
            setTimeout(() => {
                document.querySelector('#loginSection .form-container').classList.add('active');
            }, 100);
        }

function showSignup() {
            document.getElementById('loginSection').style.display = 'none';
            document.getElementById('signupSection').style.display = 'flex';
            
            // Update toggle buttons
            document.querySelectorAll('.toggle-btn').forEach(btn => btn.classList.remove('active'));
            document.querySelectorAll('.toggle-btn')[1].classList.add('active');
            
            // Animate form
            setTimeout(() => {
                document.querySelector('#signupSection .form-container').classList.add('active');
            }, 100);
        }

// Password toggle functionality
        function togglePassword(inputId, toggleElement) {
            const input = document.getElementById(inputId);
            const icon = toggleElement.querySelector('i');
            
            if (input.type === 'password') {
                input.type = 'text';
                icon.classList.remove('fa-eye');
                icon.classList.add('fa-eye-slash');
            } else {
                input.type = 'password';
                icon.classList.remove('fa-eye-slash');
                icon.classList.add('fa-eye');
            }
        }

// Form validation and submission
        document.getElementById('loginForm').addEventListener('submit', function(e) {
            e.preventDefault();
            const btn = this.querySelector('.neon-btn');
            simulateAuth(btn, 'Giriş başarılı! Hoş geldiniz.');
        });

document.getElementById('signupForm').addEventListener('submit', function(e) {
            e.preventDefault();
            
            // Check password confirmation
            const password = document.getElementById('signupPassword').value;
            const confirmPassword = document.getElementById('confirmPassword').value;
            
            if (password !== confirmPassword) {
                showToast('Şifreler eşleşmiyor!', 'error');
                return;
            }
            
            const btn = this.querySelector('.neon-btn');
            simulateAuth(btn, 'Hesabınız oluşturuldu!

CSS