/* Modern and Responsive Styles */
body {
    font-family: Arial, sans-serif;
    background-color: #f8f9fa;
    color: #333;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h2, h3 {
    color: #007bff;
}

.form-group {
    margin-bottom: 15px;
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid #ced4da;
    border-radius: 4px;
}

.btn {
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.btn-primary {
    background-color: #007bff;
    color: white;
}

.btn-success {
    background-color: #28a745;
    color: white;
}

#visitor-message {
    margin-top: 15px;
    color: red;
}

@media (max-width: 767px) {
    .container {
        padding: 15px;
    }
}