.recipient-fields {
  display: none;
}

.recipient-fields__field:last-child {
  margin-bottom: 2rem;
}

.recipient-form > input[type='checkbox']:checked ~ .recipient-fields {
  display: block;
}

.recipient-form
  > input[type='checkbox']:not(:checked, :disabled)
  ~ .recipient-fields,
.recipient-email-label {
  display: none;
}