Formulario de inicio de sesión HTML con alternancia de contraseña

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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>Login Form</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div class="container">
        <div class="login-card">
            <div class="overlay"></div>
            
            <div class="content">
                
                <div class="header">
                    <h2>My Account</h2>
                    <div class="avatar">
                        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" 
                                  d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2" />
                            <circle cx="12" cy="7" r="4" />
                        </svg>
                    </div>
                </div>

<form id="loginForm">
                    <div class="form-group">
                        <label for="email">Login</label>
                        <input type="email" id="email" required>
                    </div>

<div class="form-group">
                        <label for="password">Password</label>
                        <div class="password-container">
                            <input type="password" id="password" required>
                            <button type="button" id="togglePassword" class="toggle-password">
                                <svg class="eye-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" 
                                          d="M15 12a3 3 0 11-6 0 3 3 0 016 0z M2 12s3-9 10-9 10 9 10 9-3 9-10 9-10-9-10-9z" />
                                </svg>
                                <svg class="eye-off-icon hidden" viewBox="0 0 24 24" fill="none" stroke="currentColor">
                                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" 
                                          d="M13.875 18.825A10.05 10.05 0 0112 19c-4.478 0-8.268-2.943-9.543-7a9.97 9.97 0 011.563-3.029m5.858.908a3 3 0 114.243 4.243M9.878 9.878l4.242 4.242M9.88 9.88l-3.29-3.29m7.532 7.532l3.29 3.29M3 3l3.59 3.59m0 0A9.953 9.953 0 0112 5c4.478 0 8.268 2.943 9.543 7a10.025 10.025 0 01-4.132 5.411m0 0L21 21" />
                                </svg>
                            </button>
                        </div>
                    </div>

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

CSS

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

.container {
    width: 100%;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #E5C9D7 0%, #6BA3BE 100%);
    padding: 1rem;
}

.login-card {
    width: 100%;
    max-width: 400px;
    position: relative;
    background-color: #E3B6B1;
    border-radius: 0.5rem;
    box-shadow: 0 4px 20px rgba(163, 64, 84, 0.15);
    overflow: hidden;
}

.overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(4px);
}

.content {
    position: relative;
    padding: 2rem;
}

.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header h2 {
    color: #A34054;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.avatar {
    width: 5rem;
    height: 5rem;
    margin: 0 auto;
    background-color: #E5C9D7;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar svg {
    width: 2.5rem;
    height: 2.5rem;
    color: #A34054;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #A34054;
    margin-bottom: 0.25rem;
}

.form-group input {
    width: 100%;
    padding: 0.5rem 1rem;
    background-color: #E5C9D7;
    border: 1px solid #A34054;
    border-radius: 0.375rem;
    color: #A34054;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: #A34054;
    box-shadow: 0 0 0 2px rgba(163, 64, 84, 0.2);
}

.password-container {
    position: relative;
}

.toggle-password {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: #A34054;
    padding: 0.25rem;
}

.toggle-password svg {
    width: 1.25rem;
    height: 1.25rem;
}

.hidden {
    display: none;
}

.form-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #A34054;
    font-size: 0.875rem;
}

.remember-me input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    border-color: #A34054;
}

.forgot-password {
    color: #A34054;
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: opacity 0.2s;
}

.forgot-password:hover {
    opacity: 0.8;
}

.submit-button {
    width: 100%;
    padding: 0.5rem 1rem;
    background-color: #A34054;
    color: white;
    border: none;
    border-radius: 0.375rem;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s;
    box-shadow: 0 2px 10px rgba(163, 64, 84, 0.2);
}

.submit-button:hover {
    opacity: 0.9;
}

JS

document.addEventListener('DOMContentLoaded', () => {
    const loginForm = document.getElementById('loginForm');
    const message = document.getElementById('message');

// Giriş formu gönderildiğinde
    loginForm.addEventListener('submit', function(e) {
        e.preventDefault();

const email = document.querySelector('input[type="email"]').value.trim();
        const password = document.querySelector('input[type="password"]').value.trim();

// E-posta ve şifre doğrulama
        if (!validateEmail(email)) {
            showMessage("Geçersiz e-posta adresi!", "#FF4444");
            return;
        }

if (password.length < 6) {
            showMessage("Şifre en az 6 karakter olmalıdır!", "#FF4444");
            return;
        }

// Örnek kullanıcı kontrolü
        if (email === "admin@example.com" && password === "12345") {
            showMessage("Giriş başarılı! Yönlendiriliyorsunuz...", "#4CAF50");
            setTimeout(() => {
                message.textContent = "Hoş geldiniz!";
            }, 2000);
        } else {
            showMessage("E-posta veya şifre hatalı!", "#FF4444");
        }
    });

// E-posta doğrulama fonksiyonu
    function validateEmail(email) {
        const regex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
        return regex.test(email);
    }

// Mesaj gösterme fonksiyonu
    function showMessage(text, color) {
        message.style.color = color;
        message.style.background = ${color}20; // Hafif arka plan rengi
        message.textContent = text;
        message.style.display = 'block'; // Mesajı göster

// Hata animasyonu için konteyneri sars
        const container = document.querySelector('.container');
        container.style.animation = 'none';
        container.offsetHeight; // Reflow tetikleme
        container.style.animation = 'shake 0.5s ease';
    }

// Şifremi unuttum bağlantısı
    document.querySelector('.forgot a').addEventListener('click', function(e) {
        e.preventDefault();
        showMessage("Şifre sıfırlama bağlantısı e-posta adresinize gönderildi.", "#FFA500");
    });
});

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