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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>Newsletter Signup</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

body {
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            padding: 20px;
        }

.container {
            width: 100%;
            max-width: 450px;
        }

.card {
            background: white;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            padding: 40px;
            text-align: center;
        }

.logo {
            width: 80px;
            height: 80px;
            margin: 0 auto 24px;
            background: #6b46c1;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            font-size: 24px;
        }

h1 {
            color: #333;
            margin-bottom: 12px;
            font-size: 24px;
        }

.subheading {
            color: #666;
            margin-bottom: 32px;
            font-size: 16px;
            line-height: 1.5;
        }

.social-signup {
            display: flex;
            justify-content: center;
            gap: 16px;
            margin-bottom: 24px;
        }

.social-btn {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid #e2e8f0;
            background: white;
            color: #4a5568;
            cursor: pointer;
            transition: all 0.2s ease;
        }

.social-btn:hover {
            background: #f7fafc;
            transform: translateY(-2px);
        }

.divider {
            display: flex;
            align-items: center;
            margin: 24px 0;
            color: #a0aec0;
        }

.divider::before,
        .divider::after {
            content: "";
            flex: 1;
            height: 1px;
            background: #e2e8f0;
        }

.divider span {
            padding: 0 16px;
            font-size: 14px;
        }

.form-group {
            margin-bottom: 24px;
        }

input {
            width: 100%;
            padding: 16px;
            border: 1px solid #e2e8f0;
            border-radius: 8px;
            font-size: 16px;
            transition: border-color 0.2s;
        }

input:focus {
            outline: none;
            border-color: #6b46c1;
        }

.cta-button {
            width: 100%;
            padding: 16px;
            background: #6b46c1;
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
        }

.cta-button:hover {
            background: #553c9a;
            transform: translateY(-2px);
        }

.links {
            display: flex;
            justify-content: center;
            gap: 24px;
            margin-top: 24px;
            font-size: 14px;
        }

.links a {
            color: #6b46c1;
            text-decoration: none;
        }

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

.footer {
            text-align: center;
            margin-top: 24px;
            color: #718096;
            font-size: 14px;
        }

.success-message {
            display: none;
            color: #38a169;
            margin-top: 16px;
            font-weight: 500;
        }

.error-message {
            display: none;
            color: #e53e3e;
            margin-top: 8px;
            font-size: 14px;
            text-align: left;
        }

@media (max-width: 480px) {
            .card {
                padding: 24px;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="card">
            <div class="logo">M</div>
            <h1>Subscribe to Our Newsletter</h1>
            <p class="subheading">Get weekly insights, tips, and exclusive content directly to your inbox.</p>
            
            <div class="social-signup">
                <button class="social-btn">
                    <i class="fab fa-google"></i>
                </button>
                <button class="social-btn">
                    <i class="fab fa-facebook-f"></i>
                </button>
                <button class="social-btn">
                    <i class="fab fa-twitter"></i>
                </button>
            </div>
            
            <div class="divider">
                <span>or sign up with email</span>
            </div>
            
            <form id="newsletter-form">
                <div class="form-group">
                    <input type="email" id="email" placeholder="Your email address" required>
                    <div class="error-message" id="email-error">Please enter a valid email address</div>
                </div>
                
                <button type="submit" class="cta-button">Subscribe Now</button>
                <div class="success-message" id="success-message">Thanks for subscribing!</div>
            </form>
            
            <div class="links">
                <a href="#">Terms</a>
                <a href="#">Privacy</a>
                <a href="#">Help</a>
            </div>
        </div>
        
        <div class="footer">
            <p>We respect your privacy. Unsubscribe at any time.</p>
        </div>
    </div>

CSS