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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Awesome Login Form</title>
    <link rel="stylesheet" href="styles.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css">
</head>
<body>
    <div class="circles">
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
    </div>

<div class="login-container">
        <div class="login-header">
            <h1>Welcome Back</h1>
            <p>Please login to your account</p>
        </div>

<form id="loginForm">
            <div class="input-group">
                <input type="email" id="email" required>
                <label for="email">Email</label>
                <div class="error-message" id="email-error">Please enter a valid email</div>
            </div>

<div class="input-group">
                <input type="password" id="password" required>
                <label for="password">Password</label>
                <div class="error-message" id="password-error">Password must be at least 6 characters</div>
            </div>

<div class="forgot-password">
                <a href="#">Forgot Password?</a>
            </div>

<button type="submit" class="login-button">Login</button>

<div class="signup-link">
                Don't have an account? <a href="#" class="signup-text">Sign up</a>
            </div>

CSS

@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 {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

.login-container {
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    width: 400px;
    max-width: 90%;
    padding: 40px;
    position: relative;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform 0.5s ease, box-shadow 0.5s ease;
    z-index: 10;
}

.login-container:hover {
    transform: scale(1);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.login-container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: rotate(45deg);
    animation: shine 3s infinite;
    z-index: -1;
}

@keyframes shine {
    0% {
        left: -100%;
    }
    20%, 100% {
        left: 100%;
    }
}

.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.login-header h1 {
    color: #333;
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 10px;
}

.login-header p {
    color: #666;
    font-size: 14px;
}

.input-group {
    position: relative;
    margin-bottom: 25px;
}

.input-group input {
    width: 100%;
    padding: 15px 20px;
    border: none;
    background-color: #f5f5f5;
    border-radius: 50px;
    font-size: 16px;
    outline: none;
    transition: all 0.3s ease;
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.05);
}

.input-group input:focus {
    background-color: #e9e9e9;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.1);
}

.input-group label {
    position: absolute;
    top: 15px;
    left: 20px;
    color: #999;
    font-size: 16px;
    pointer-events: none;
    transition: all 0.3s ease;
}

.input-group input:focus + label,
.input-group input:valid + label {
    top: -10px;
    left: 15px;
    font-size: 12px;
    background-color: #fff;
    padding: 0 5px;
    color: #764ba2;
}

.forgot-password {
    text-align: right;
    margin-bottom: 20px;
}

.forgot-password a {
    color: #666;
    font-size: 14px;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.login-button {
    width: 100%;
    padding: 15px;
    border: none;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(118, 75, 162, 0.4);
}

.login-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(118, 75, 162, 0.6);
}

.login-button:active {
    transform: translateY(0);
}

.signup-link {
    text-align: center;
    margin-top: 30px;
    color: #666;
    font-size: 14px;
}

.signup-link a.signup-text {
    color: inherit;
    font-weight: normal;
    text-decoration: none;
}

.social-login {
    display: flex;
    justify-content: center;
    margin-top: 30px;
    gap: 15px;
}

.social-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.social-icon:hover {
    transform: translateY(-5px);
}

.facebook {
    background-color: #3b5998;
}

.google {
    background-color: #db4437;
}

.twitter {
    background-color: #1da1f2;
}

.error-message {
    color: #e74c3c;
    font-size: 14px;
    margin-top: 5px;
    display: none;
}

.circles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 1;
}

.circles li {
    position: absolute;
    display: block;
    list-style: none;
    width: 20px;
    height: 20px;
    background: rgba(255, 255, 255, 0.2);
    animation: animate 25s linear infinite;
    bottom: -150px;
    border-radius: 50%;
}

.circles li:nth-child(1) {
    left: 25%;
    width: 80px;
    height: 80px;
    animation-delay: 0s;
}

.circles li:nth-child(2) {
    left: 10%;
    width: 20px;
    height: 20px;
    animation-delay: 2s;
    animation-duration: 12s;
}

.circles li:nth-child(3) {
    left: 70%;
    width: 20px;
    height: 20px;
    animation-delay: 4s;
}

.circles li:nth-child(4) {
    left: 40%;
    width: 60px;
    height: 60px;
    animation-delay: 0s;
    animation-duration: 18s;
}

.circles li:nth-child(5) {
    left: 65%;
    width: 20px;
    height: 20px;
    animation-delay: 0s;
}

.circles li:nth-child(6) {
    left: 75%;
    width: 110px;
    height: 110px;
    animation-delay: 3s;
}

.circles li:nth-child(7) {
    left: 35%;
    width: 150px;
    height: 150px;
    animation-delay: 7s;
}

.circles li:nth-child(8) {
    left: 50%;
    width: 25px;
    height: 25px;
    animation-delay: 15s;
    animation-duration: 45s;
}

.circles li:nth-child(9) {
    left: 20%;
    width: 15px;
    height: 15px;
    animation-delay: 2s;
    animation-duration: 35s;
}

.circles li:nth-child(10) {
    left: 85%;
    width: 150px;
    height: 150px;
    animation-delay: 0s;
    animation-duration: 11s;
}

@keyframes animate {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 1;
        border-radius: 0;
    }
    100% {
        transform: translateY(-1000px) rotate(720deg);
        opacity: 0;
        border-radius: 50%;
    }
}

@media (max-width: 480px) {
    .login-container {
        padding: 30px 20px;
    }
    
    .login-header h1 {
        font-size: 24px;
    }
}

document.addEventListener('DOMContentLoaded', function() {
    const form = document.getElementById('loginForm');
    const emailInput = document.getElementById('email');
    const passwordInput = document.getElementById('password');
    const emailError = document.getElementById('email-error');
    const passwordError = document.getElementById('password-error');

// Floating label functionality
    const inputs = document.querySelectorAll('.input-group input');
    inputs.forEach(input => {
        input.addEventListener('focus', function() {
            this.parentNode.querySelector('label').classList.add('active');
        });
        
        input.addEventListener('blur', function() {
            if (this.value === '') {
                this.parentNode.querySelector('label').classList.remove('active');
            }
        });
        
        // Initialize labels if inputs have values
        if (input.value !== '') {
            input.parentNode.querySelector('label').classList.add('active');
        }
    });

// Form validation
    form.addEventListener('submit', function(e) {
        e.preventDefault();
        let isValid = true;

// Email validation
        if (!validateEmail(emailInput.value)) {
            emailError.style.display = 'block';
            emailInput.parentNode.classList.add('error');
            isValid = false;
        } else {
            emailError.style.display = 'none';
            emailInput.parentNode.classList.remove('error');
        }

// Password validation
        if (passwordInput.value.length < 6) {
            passwordError.style.display = 'block';
            passwordInput.parentNode.classList.add('error');
            isValid = false;
        } else {
            passwordError.style.display = 'none';
            passwordInput.parentNode.classList.remove('error');
        }

if (isValid) {
            // Simulate successful login
            document.querySelector('.login-button').textContent = 'Logging in...';
            
            setTimeout(() => {
                alert('Login successful!');
                form.reset();
                document.querySelector('.login-button').textContent = 'Login';
                
                // Remove active class from labels
                inputs.forEach(input => {
                    input.parentNode.querySelector('label').classList.remove('active');
                });
            }, 1500);
        }
    });

function validateEmail(email) {
        const re = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
        return re.test(email);
    }

// Add ripple effect to login button
    const loginButton = document.querySelector('.login-button');
    loginButton.addEventListener('click', function(e) {
        const x = e.clientX - e.target.getBoundingClientRect().left;
        const y = e.clientY - e.target.getBoundingClientRect().top;
        
        const ripple = document.createElement('span');
        ripple.classList.add('ripple');
        ripple.style.left = `${x}px`;
        ripple.style.top = `${y}px`;
        
        this.appendChild(ripple);
        
        setTimeout(() => {
            ripple.remove();
        }, 1000);
    });
});