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HTML

<!DOCTYPE html>
<html lang="tr">
<head>
    <meta charset="UTF-8">
    <title>Giriş Sayfası</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <canvas class="matrix-background" id="matrixCanvas"></canvas>
    
    <div class="login-container">
        <div class="logo">Giriş Sayfası</div>
        
        <div id="errorMessage" class="error-message"></div>
        
        <form id="loginForm">
            <div class="input-group">
                <input 
                    type="text" 
                    id="username" 
                    placeholder="Kullanıcı Adı" 
                    required
                >
            </div>
            
            <div class="input-group">
                <input 
                    type="password" 
                    id="password" 
                    placeholder="Şifre" 
                    required
                >
            </div>
            
            <button type="submit" class="login-btn">Giriş Yap</button>
        </form>
    </div>

CSS

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}
body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #121212;
    overflow: hidden;
}
.login-container {
    width: 400px;
    background-color: rgba(30,30,30,0.9);
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.5);
    position: relative;
    z-index: 2;
    transition: all 0.3s ease;
}
.login-container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(
        transparent,
        transparent,
        transparent,
        #00ff00
    );
    animation: rotate 4s linear infinite;
    z-index: -1;
}
.login-container::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: #121212;
    margin: 10px;
    border-radius: 10px;
    z-index: -1;
}
@keyframes rotate {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}
.logo {
    text-align: center;
    color: #00ff00;
    font-size: 2.5rem;
    margin-bottom: 30px;
    text-shadow: 0 0 10px rgba(0,255,0,0.5);
}
.input-group {
    position: relative;
    margin-bottom: 20px;
}
.input-group input {
    width: 100%;
    padding: 12px 20px;
    background-color: rgba(50,50,50,0.8);
    border: 2px solid transparent;
    border-radius: 8px;
    color: #00ff00;
    outline: none;
    transition: all 0.3s ease;
}
.input-group input:focus {
    border-color: #00ff00;
    box-shadow: 0 0 15px rgba(0,255,0,0.3);
}
.input-group input::placeholder {
    color: rgba(0,255,0,0.5);
}
.login-btn {
    width: 100%;
    padding: 12px;
    background-color: #00ff00;
    color: #121212;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}
.login-btn:hover {
    background-color: #00cc00;
    transform: scale(1.05);
}
.error-message {
    color: #ff0000;
    text-align: center;
    margin-bottom: 15px;
    display: none;
}
.matrix-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

// Matrix Arka Plan Efekti
const canvas = document.getElementById('matrixCanvas');
const ctx = canvas.getContext('2d');

canvas.width = window.innerWidth;
canvas.height = window.innerHeight;

const letters = '01';
const fontSize = 10;
const columns = canvas.width / fontSize;

const drops = [];
for (let x = 0; x < columns; x++) {
    drops[x] = 1;
}

function drawMatrix() {
    ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';
    ctx.fillRect(0, 0, canvas.width, canvas.height);

ctx.fillStyle = '#00ff00';
    ctx.font = fontSize + 'px monospace';

for (let i = 0; i < drops.length; i++) {
        const text = letters.charAt(Math.floor(Math.random() * letters.length));
        ctx.fillText(text, i * fontSize, drops[i] * fontSize);

if (drops[i] * fontSize > canvas.height && Math.random() > 0.95) {
            drops[i] = 0;
        }
        drops[i]++;
    }
}

function animateMatrix() {
    drawMatrix();
    requestAnimationFrame(animateMatrix);
}

// Giriş Doğrulama
function validateLogin(event) {
    event.preventDefault();
    
    const username = document.getElementById('username');
    const password = document.getElementById('password');
    const errorMessage = document.getElementById('errorMessage');
    
    const validUsername = 'admin';
    const validPassword = 'leon123';
    
    if (username.value === validUsername && password.value === validPassword) {
        errorMessage.style.display = 'none';
        
        // Sahte yükleme animasyonu
        canvas.style.transition = 'opacity 1s';
        canvas.style.opacity = '0';
        
        setTimeout(() => {
            alert('Giriş Başarılı! Yönlendiriliyorsunuz...');
        }, 500);
    } else {
        errorMessage.textContent = 'Hatalı kullanıcı adı veya şifre!';
        errorMessage.style.display = 'block';
    }
}

// Event Listener'ları
document.getElementById('loginForm').addEventListener('submit', validateLogin);

// Pencere boyutu değiştiğinde canvas'ı yeniden boyutlandır
window.addEventListener('resize', () => {
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
});

// Matrix Animasyonunu Başlat
animateMatrix();