/* ==========================================================================
   ANIMATIONS
   Small, purposeful motion only. Everything here is disabled for users
   who have requested reduced motion at the OS level.
   ========================================================================== */

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Elements with [data-reveal] start hidden and are revealed by main.js
   toggling the .is-revealed class via IntersectionObserver. */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--duration-slow) var(--ease-standard),
              transform var(--duration-slow) var(--ease-standard);
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* Spinner used briefly on form submit */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  display: inline-block;
  animation: spin 700ms linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation-duration: 1400ms;
  }
}