header {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 1em;
  justify-content: space-between;
}

.site-menu {
  display: flex;
  gap: 1em;
  font-size: 0.55em;
  font-weight: normal;
  margin-left: auto;
}

.site-menu a {
  color: #444;
}

.site-menu a[aria-current="page"] {
  color: #17baef;
}

.thanks,
.sending {
  display: none;
}

#contact-us-form {
  max-width: 640px;
}

#contact-us-form .form-group {
  margin-bottom: 1.25em;
}

#contact-us-form label {
  display: block;
  margin-bottom: 0.35em;
}

#contact-us-form .form-control {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 0;
  color: #444;
  font: inherit;
  padding: 0.6em;
  width: 100%;
}

#contact-us-form textarea.form-control {
  min-height: 8em;
  resize: vertical;
}

#contact-us-form .invalid-feedback {
  color: #b33;
  display: none;
  margin-top: 0.35em;
}

#contact-us-form.was-validated .form-control:invalid + .invalid-feedback {
  display: block;
}

#contact-us-form button {
  background: #444;
  border: 0;
  color: #fff;
  cursor: pointer;
  font: inherit;
  padding: 0.65em 1.2em;
}

@media (max-width: 500px) {
  header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.5em;
  }
}