Login & Registration Form (HTML, CSS, JS)

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<!DOCTYPE html>
<html lang="tr">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Giriş & Kayıt Formu</title>
    
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css">
    <style>
        @import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Poppins', sans-serif;
        }

body {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background: #1c1c1c; /* Dark background for neon effect */
            overflow: hidden;
        }

/* Neon glow background effect */
        body::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 600px;
            height: 600px;
            background: linear-gradient(45deg, #ff003c, #ffdd00);
            border-radius: 50%;
            filter: blur(150px);
            opacity: 0.5;
        }

.container {
            position: relative;
            background: rgba(255, 255, 255, 0.05); /* Glassmorphism effect */
            border-radius: 20px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.25);
            border: 1px solid rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            width: 700px;
            min-height: 450px;
            overflow: hidden; /* Hide overflowing toggle panel */
        }

.container p {
            color: #ccc;
            font-size: 14px;
            margin: 15px 0;
        }

.container a {
            color: #fff;
            font-size: 14px;
            text-decoration: none;
            margin: 15px 0;
            font-weight: 500;
        }

.container a:hover {
            text-decoration: underline;
        }

.container button {
            border-radius: 20px;
            border: 1px solid #ff003c;
            background-color: #ff003c;
            color: #ffffff;
            font-size: 12px;
            font-weight: bold;
            padding: 12px 45px;
            letter-spacing: 1px;
            text-transform: uppercase;
            cursor: pointer;
            transition: transform 80ms ease-in, background-color 0.3s ease, box-shadow 0.3s ease;
        }

.container button:active {
            transform: scale(0.95);
        }

.container button:focus {
            outline: none;
        }
        
        .container button:hover {
            background-color: #ffdd00;
            border-color: #ffdd00;
            color: #1c1c1c;
            box-shadow: 0 0 20px #ffdd00;
        }

.container button.ghost {
            background-color: transparent;
            border-color: #ffffff;
        }
        
        .container button.ghost:hover {
            background-color: #fff;
            color: #1c1c1c;
            box-shadow: 0 0 20px #fff;
        }

.container form {
            background: transparent;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            padding: 0 50px;
            height: 100%;
            text-align: center;
        }

.container input {
            background-color: rgba(255, 255, 255, 0.1);
            border: none;
            border-radius: 10px;
            padding: 12px 15px;
            margin: 8px 0;
            width: 100%;
            color: #fff;
            outline: none;
            border: 1px solid transparent;
            transition: border-color 0.3s ease;
        }

.container input::placeholder {
            color: #ccc;
        }

.container input:focus {
            border-color: #ffdd00;
        }

h1 {
            font-weight: bold;
            margin: 0;
            color: #fff;
            text-shadow: 0 0 10px #ff003c;
        }

.form-container {
            position: absolute;
            top: 0;
            height: 100%;
            transition: all 0.6s ease-in-out;
        }

.sign-in-container {
            left: 0;
            width: 50%;
            z-index: 2;
        }

.container.right-panel-active .sign-in-container {
            transform: translateX(100%);
            opacity: 0;
        }

.sign-up-container {
            left: 0;
            width: 50%;
            opacity: 0;
            z-index: 1;
        }

.container.right-panel-active .sign-up-container {
            transform: translateX(100%);
            opacity: 1;
            z-index: 5;
            animation: show 0.6s;
        }

@keyframes show {
            0%, 49.99% {
                opacity: 0;
                z-index: 1;
            }
            50%, 100% {
                opacity: 1;
                z-index: 5;
            }
        }

.overlay-container {
            position: absolute;
            top: 0;
            left: 50%;
            width: 50%;
            height: 100%;
            overflow: hidden;
            transition: transform 0.6s ease-in-out;
            z-index: 100;
        }

.container.right-panel-active .overlay-container {
            transform: translateX(-100%);
        }

.overlay {
            background: #ff003c;
            background: -webkit-linear-gradient(to right, #ffdd00, #ff003c);
            background: linear-gradient(to right, #ffdd00, #ff003c);
            background-repeat: no-repeat;
            background-size: cover;
            background-position: 0 0;
            color: #ffffff;
            position: relative;
            left: -100%;
            height: 100%;
            width: 200%;
            transform: translateX(0);
            transition: transform 0.6s ease-in-out;
        }

.container.right-panel-active .overlay {
            transform: translateX(50%);
        }

.overlay-panel {
            position: absolute;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
            padding: 0 40px;
            text-align: center;
            top: 0;
            height: 100%;
            width: 50%;
            transform: translateX(0);
            transition: transform 0.6s ease-in-out;
        }
        
        .overlay-panel h1 {
            text-shadow: none;
        }

.overlay-left {
            transform: translateX(-20%);
        }

.container.right-panel-active .overlay-left {
            transform: translateX(0);
        }

.overlay-right {
            right: 0;
            transform: translateX(0);
        }

.container.right-panel-active .overlay-right {
            transform: translateX(20%);
        }

.social-container {
            margin: 20px 0;
        }

.social-container a {
            border: 1px solid #dddddd;
            border-radius: 50%;
            display: inline-flex;
            justify-content: center;
            align-items: center;
            margin: 0 5px;
            height: 40px;
            width: 40px;
            color: #fff;
            transition: all 0.3s ease;
        }

.social-container a:hover {
            color: #1c1c1c;
            background-color: #fff;
            border-color: #fff;
            transform: scale(1.1);
            box-shadow: 0 0 15px #fff;
        }
        
        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                width: 95%;
                max-width: 450px;
            }
            .overlay-container {
                display: none;
            }
            .form-container {
                width: 100%;
            }
            .sign-in-container {
                opacity: 1;
                z-index: 2;
            }
            .sign-up-container {
                opacity: 0;
                z-index: 1;
            }
            .container.right-panel-active .sign-in-container {
                transform: none;
                opacity: 0;
                z-index: 1;
            }
            .container.right-panel-active .sign-up-container {
                transform: none;
                opacity: 1;
                z-index: 2;
            }
            
            /* We will use JS to toggle a class for mobile view */
            .mobile-toggle-panel {
                display: block;
                padding: 20px;
                text-align: center;
                position: absolute;
                bottom: 0;
                left: 0;
                width: 100%;
                background: rgba(0,0,0,0.3);
            }
        }
        
        @media (min-width: 769px) {
            .mobile-toggle-panel {
                display: none;
            }
        }

</style>
</head>
<body>

<div class="container" id="container">
        
        <div class="form-container sign-up-container">
            <form action="#">
                <h1>Hesap Oluştur</h1>
                <div class="social-container">
                    <a href="#" class="social"><i class="fab fa-facebook-f"></i></a>
                    <a href="#" class="social"><i class="fab fa-google-plus-g"></i></a>
                    <a href="#" class="social"><i class="fab fa-linkedin-in"></i></a>
                </div>
                <p>veya kayıt için e-postanızı kullanın</p>
                <input type="text" placeholder="Adınız" />
                <input type="email" placeholder="E-posta" />
                <input type="password" placeholder="Şifre" />
                <a href="mailto:cengizalagoz60@gmail.com">Şifremi Unuttum</a>
                <button>Kayıt Ol</button>
            </form>
        </div>
        
        
        <div class="form-container sign-in-container">
            <form action="#">
                <h1>Giriş Yap</h1>
                <div class="social-container">
                    <a href="#" class="social"><i class="fab fa-facebook-f"></i></a>
                    <a href="#" class="social"><i class="fab fa-google-plus-g"></i></a>
                    <a href="#" class="social"><i class="fab fa-linkedin-in"></i></a>
                </div>
                <p>veya hesabınızı kullanın</p>
                <input type="email" placeholder="E-posta" />
                <input type="password" placeholder="Şifre" />
                <a href="mailto:cengizalagoz60@gmail.com">Şifremi Unuttum</a>
                <button>Giriş Yap</button>
            </form>
        </div>
        
        
        <div class="overlay-container">
            <div class="overlay">
                <div class="overlay-panel overlay-left">
                    <h1>Tekrar Hoşgeldin!</h1>
                    <p>Giriş yapmak ve bizimle bağlantıda kalmak için lütfen kişisel bilgilerinizi girin.</p>
                    <button class="ghost" id="signIn">Giriş Yap</button>
                </div>
                <div class="overlay-panel overlay-right">
                    <h1>Merhaba!</h1>
                    <p>Kişisel bilgilerinizi girin ve bizimle yolculuğa başlayın.</p>
                    <button class="ghost" id="signUp">Kayıt Ol</button>
                </div>
            </div>
        </div>
        
        
        <div class="mobile-toggle-panel">
             <p id="mobile-text">Hesabın yok mu? <a href="#" id="mobile-toggle-btn">Kayıt Ol</a></p>
        </div>
    </div>

// Desktop toggle
        signUpButton.addEventListener('click', () => {
            container.classList.add("right-panel-active");
        });

signInButton.addEventListener('click', () => {
            container.classList.remove("right-panel-active");
        });
        
        // Mobile toggle
        mobileToggleBtn.addEventListener('click', (e) => {
            e.preventDefault();
            container.classList.toggle("right-panel-active");
            
            if (container.classList.contains("right-panel-active")) {
                mobileText.innerHTML = 'Zaten hesabın var mı? <a href="#" id="mobile-toggle-btn">Giriş Yap</a>';
            } else {
                mobileText.innerHTML = 'Hesabın yok mu? <a href="#" id="mobile-toggle-btn">Kayıt Ol</a>';
            }
            
            // Re-assign the event listener to the new link
            document.getElementById('mobile-toggle-btn').addEventListener('click', arguments.callee);
        });

</script>

</body>
</html>

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