<style>
        body {
            font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background-color: #f4f7f6;
            color: #333;
            line-height: 1.6;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        .container {
            text-align: center;
            background: white;
            padding: 3rem;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            max-width: 400px;
            width: 90%;
        }
        h1 {
            color: #2c3e50;
            margin-bottom: 0.5rem;
        }
        p {
            color: #7f8c8d;
            margin-bottom: 1.5rem;
        }
        .btn {
            display: inline-block;
            background: #3498db;
            color: white;
            padding: 0.75rem 1.5rem;
            text-decoration: none;
            border-radius: 6px;
            transition: background 0.2s ease;
        }
        .btn:hover {
            background: #2980b9;
        }
</style>
