/* ============================================================
   Imforia Motion Utilities  —  v1.0  (Phase 1: Design System Lock)
   All animations honour prefers-reduced-motion.
   Depends on tokens.css being loaded first.
   ============================================================ */

/* ── Fade-up ─────────────────────────────────────────────────
   Add .fade-up to any element. A small JS IntersectionObserver
   (in motion-observer.js) toggles .is-visible when the element
   enters the viewport.                                        */
.fade-up {
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity   var(--duration-base) var(--ease-out),
    transform var(--duration-base) var(--ease-out);
}

.fade-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger siblings with data-delay attribute */
.fade-up[data-delay="1"] { transition-delay: 60ms;  }
.fade-up[data-delay="2"] { transition-delay: 120ms; }
.fade-up[data-delay="3"] { transition-delay: 180ms; }
.fade-up[data-delay="4"] { transition-delay: 240ms; }

/* ── Hover Lift ──────────────────────────────────────────────
   Subtle elevation on hover. Use on cards, buttons, tiles.    */
.hover-lift {
  transition:
    transform   var(--duration-fast) var(--ease-out),
    box-shadow  var(--duration-fast) var(--ease-out);
  will-change: transform, box-shadow;
}

.hover-lift:hover {
  transform:  translateY(var(--lift-hover));
  box-shadow: var(--shadow-4);
}

/* ── Press ───────────────────────────────────────────────────
   Scale-down feedback on :active. Combine with .hover-lift
   on interactive cards/buttons.                              */
.press {
  transition: transform var(--duration-fast) var(--ease-inout);
  will-change: transform;
}

.press:active {
  transform: scale(0.96);
}

/* ── Skeleton Shimmer ────────────────────────────────────────
   Apply to a placeholder element sized like its content.
   All child content is hidden while skeleton is active.      */
@keyframes imf-shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position:  200% 0; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-neutral-100) 25%,
    var(--color-neutral-200) 50%,
    var(--color-neutral-100) 75%
  );
  background-size: 200% 100%;
  animation: imf-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
  color: transparent !important;
  pointer-events: none;
  user-select: none;
}

.skeleton * {
  visibility: hidden;
}

/* ── Enter / Exit helpers ────────────────────────────────────
   Low-level primitives for JS-driven transitions (modals,
   toasts, drawers). Apply .enter-from before adding to DOM,
   .enter-active during, remove both when done.               */
.enter-from {
  opacity: 0;
  transform: translateY(6px) scale(0.98);
}

.enter-active {
  opacity: 1;
  transform: translateY(0) scale(1);
  transition:
    opacity   var(--duration-base) var(--ease-out),
    transform var(--duration-base) var(--ease-spring);
}

.exit-active {
  opacity: 0;
  transform: translateY(4px) scale(0.98);
  transition:
    opacity   var(--duration-fast) var(--ease-in),
    transform var(--duration-fast) var(--ease-in);
}

/* ── Spin (loading indicators) ───────────────────────────────*/
@keyframes imf-spin {
  to { transform: rotate(360deg); }
}

.spin {
  animation: imf-spin 0.8s linear infinite;
  display: inline-block;
}

/* ── Pulse (attention / live badge) ─────────────────────────*/
@keyframes imf-pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

.pulse {
  animation: imf-pulse 2s var(--ease-inout) infinite;
}

/* ── Shake (form error feedback) ────────────────────────────
   Add .shake to any element to trigger once on appear.
   Remove the class after the animation ends to allow re-trigger. */
@keyframes imf-shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-6px); }
  40%       { transform: translateX(6px); }
  60%       { transform: translateX(-4px); }
  80%       { transform: translateX(4px); }
}

.shake {
  animation: imf-shake var(--duration-slow) var(--ease-inout);
}

/* ── Reduced Motion ──────────────────────────────────────────
   When the OS requests reduced motion, strip all animations
   and transitions. Visibility/state changes still happen,
   they just skip the animation.                              */
@media (prefers-reduced-motion: reduce) {
  .fade-up,
  .fade-up.is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hover-lift,
  .hover-lift:hover {
    transform: none;
    box-shadow: none;
    transition: none;
  }

  .press,
  .press:active {
    transform: none;
    transition: none;
  }

  .skeleton {
    animation: none;
    background: var(--color-neutral-100);
  }

  .enter-from { opacity: 1; transform: none; }
  .enter-active, .exit-active { transition: none; }

  .spin  { animation: none; }
  .pulse { animation: none; }
  .shake { animation: none; }
}