.sms-auth-container {
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
    border: 1px solid #dee2e6;
}

.sms-auth-container h3 {
    color: #495057;
    margin-bottom: 15px;
}

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

.sms-auth-container .form-control {
    border-radius: 4px;
    border: 1px solid #ced4da;
    padding: 8px 12px;
}

.sms-auth-container .btn {
    border-radius: 4px;
    padding: 10px 20px;
    font-weight: 500;
}

.sms-auth-container .btn-primary {
    background-color: #007bff;
    border-color: #007bff;
}

.sms-auth-container .btn-success {
    background-color: #28a745;
    border-color: #28a745;
}

.sms-auth-container .text-muted {
    font-size: 0.875em;
    color: #6c757d;
}

#otp_verification {
    border-top: 1px solid #dee2e6;
    padding-top: 15px;
}

#otp_code {
    font-family: 'Courier New', monospace;
    font-size: 1.2em;
    text-align: center;
    letter-spacing: 2px;
}