body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    margin-top: 50px;
    margin-bottom: 50px;
}

.header h1 {
    color: #2c3e50;
    font-weight: 700;
}

.btn-primary {
    background-color: #25D366;
    border-color: #25D366;
    padding: 10px 30px;
}

.btn-primary:hover {
    background-color: #128C7E;
    border-color: #128C7E;
}

.form-control, .form-select {
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ced4da;
}

label {
    font-weight: 500;
    margin-bottom: 5px;
}

#successMessage {
    padding: 20px;
    border-radius: 8px;
}