/* Motion Effects, adapted for Reforge.
   Opacity and transform only. Never changes layout, size or colour.
   Requires motion.js, which adds "js-motion" to <html>. */

/* Scroll reveal: elements marked .reveal fade and rise into place */
.js-motion .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.js-motion .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* Hover lift on cards */
.subject-card {
  transition: transform 0.25s ease-out, box-shadow 0.25s ease-out;
}
.subject-card:hover {
  transform: translateY(-3px);
}

/* Buttons: a small press response */
.btn {
  transition: transform 0.15s ease-out, background-color 0.2s ease-out, color 0.2s ease-out, border-color 0.2s ease-out;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:active {
  transform: translateY(0) scale(0.98);
}

/* Screen change: a gentle entrance for the page header */
.js-motion .page-head {
  animation: motion-rise 0.5s ease-out both;
}

/* Dialog entrance */
.sheet[open] {
  animation: motion-rise 0.28s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

@keyframes motion-rise {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

/* Respect users who've asked for less motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .js-motion .reveal,
  .js-motion .reveal.is-visible,
  .js-motion .page-head {
    opacity: 1;
    transform: none;
    animation: none;
  }
  .subject-card:hover,
  .btn:hover,
  .btn:active {
    transform: none;
  }
}