/* ==========================================================================
   ZEROSUGAR — Animation & Motion System
   Performance-first, compositor-only animations.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Animation Keyframes
   -------------------------------------------------------------------------- */

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-32px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(32px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.94);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* --------------------------------------------------------------------------
   Pre-Animation States (Invisible until triggered)
   -------------------------------------------------------------------------- */

.anim-reveal-up {
  opacity: 0;
  transform: translateY(28px);
}

.anim-reveal-fade {
  opacity: 0;
}

.anim-slide-left {
  opacity: 0;
  transform: translateX(-32px);
}

.anim-slide-right {
  opacity: 0;
  transform: translateX(32px);
}

.anim-scale-in {
  opacity: 0;
  transform: scale(0.94);
}

/* --------------------------------------------------------------------------
   Triggered States (.is-visible added by IntersectionObserver)
   -------------------------------------------------------------------------- */

.anim-reveal-up.is-visible,
.anim-reveal-fade.is-visible,
.anim-slide-left.is-visible,
.anim-slide-right.is-visible,
.anim-scale-in.is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 0.65s var(--ease-out-quint), transform 0.75s var(--ease-out-quint);
}

/* --------------------------------------------------------------------------
   Staggered Grids
   -------------------------------------------------------------------------- */

.anim-stagger-grid > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s var(--ease-out-quint), transform 0.6s var(--ease-out-quint);
  transition-delay: var(--stagger-delay, 0ms);
}

.anim-stagger-grid.is-visible > * {
  opacity: 1;
  transform: none;
}

/* --------------------------------------------------------------------------
   Component-Specific Enhancements
   -------------------------------------------------------------------------- */

/* Mobile Menu Slide-in */
.mobile-menu.open {
  animation: slideDown 0.3s var(--ease-out-quint) forwards;
}

/* Header Scroll Shrink/Blur */
.site-header {
  transition: backdrop-filter 0.4s ease, background-color 0.3s ease, -webkit-backdrop-filter 0.4s ease;
}

.site-header.scrolled {
  background-color: rgba(7, 7, 7, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

/* Button Active State Micro-interaction */
.btn:active {
  transform: scale(0.97) !important; /* Override standard hover transform */
}

/* --------------------------------------------------------------------------
   Accessibility & Performance Safeguard
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .anim-reveal-up,
  .anim-reveal-fade,
  .anim-slide-left,
  .anim-slide-right,
  .anim-scale-in,
  .anim-stagger-grid > * {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
    animation: none !important;
  }
  
  .mobile-menu.open {
    animation: none !important;
  }
}