/* Preserve the existing design while exposing keyboard and form states. */
button.mobile-menu-toggle {
  padding: 0;
  border: 0;
  background: transparent;
  font-family: inherit;
  line-height: inherit;
}

:where(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--primary-purple, #a24aa3);
  outline-offset: 4px;
}

.form-error:empty {
  display: none;
}

.form-error:not(:empty) {
  display: block;
  color: #dc3545;
  font-size: 0.875rem;
  margin-top: 5px;
}

input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: #dc3545;
}

@media (max-width: 480px) {
  .contact-info,
  .contact-form {
    min-width: 0;
  }
}

/* Let the course introduction grow with its syllabus link on small screens. */
@media (max-width: 768px) {
  .hero.courses-intro {
    height: auto;
    min-height: 0;
    padding: 48px 0 32px;
  }
  .courses-intro .hero-content {
    margin-bottom: 0;
  }
  .courses-intro .btn-primary {
    max-width: 100%;
    font-size: 0.85rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}