/* ============================================
   MUGDHA CONSTRUCTIONS LLP — Animations
   Scroll reveals, transitions, motion system
   ============================================ */

/* ── Scroll Reveal Base ── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* ── Staggered Reveals (children) ── */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.reveal-stagger.in-view > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.in-view > *:nth-child(2) { transition-delay: 80ms; }
.reveal-stagger.in-view > *:nth-child(3) { transition-delay: 160ms; }
.reveal-stagger.in-view > *:nth-child(4) { transition-delay: 240ms; }
.reveal-stagger.in-view > *:nth-child(5) { transition-delay: 320ms; }
.reveal-stagger.in-view > *:nth-child(6) { transition-delay: 400ms; }
.reveal-stagger.in-view > *:nth-child(7) { transition-delay: 480ms; }
.reveal-stagger.in-view > *:nth-child(8) { transition-delay: 560ms; }

.reveal-stagger.in-view > * {
  opacity: 1;
  transform: translateY(0);
}

/* ── Fade In ── */
.fade-in {
  opacity: 0;
  transition: opacity var(--duration-slow) var(--ease-out);
}

.fade-in.in-view {
  opacity: 1;
}

/* ── Scale In (for filter transitions) ── */
.scale-in {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out);
}

.scale-in.in-view {
  opacity: 1;
  transform: scale(1);
}

/* ── Filter Transition ── */
.filter-grid {
  position: relative;
}

.filter-grid .project-card {
  transition: opacity var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out);
}

.filter-grid .project-card.hiding {
  opacity: 0;
  transform: scale(0.95);
}

.filter-grid .project-card.showing {
  animation: filterShow var(--duration-normal) var(--ease-out) forwards;
}

@keyframes filterShow {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* ── Gold Divider Draw-In ── */
.gold-divider--animate {
  width: 0;
  transition: width 0.8s var(--ease-out);
}

.gold-divider--animate.in-view {
  width: 60px;
}

/* ── Counter Animation ── */
.count-up {
  display: inline-block;
}

/* ── Hero Text Entrance ── */
.hero-text-reveal {
  opacity: 0;
  transform: translateY(30px);
  animation: heroReveal 0.8s var(--ease-out) forwards;
}

.hero-text-reveal:nth-child(1) { animation-delay: 0.2s; }
.hero-text-reveal:nth-child(2) { animation-delay: 0.4s; }
.hero-text-reveal:nth-child(3) { animation-delay: 0.6s; }
.hero-text-reveal:nth-child(4) { animation-delay: 0.8s; }

@keyframes heroReveal {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Subtle Hover Lift ── */
.hover-lift {
  transition: transform var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

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

/* ── Image Zoom on Hover ── */
.img-zoom {
  overflow: hidden;
}

.img-zoom img {
  transition: transform var(--duration-slow) var(--ease-out);
}

.img-zoom:hover img {
  transform: scale(1.05);
}

/* ── Arrow Nudge ── */
.arrow-nudge svg,
.arrow-nudge .arrow {
  transition: transform var(--duration-fast) var(--ease-out);
}

.arrow-nudge:hover svg,
.arrow-nudge:hover .arrow {
  transform: translateX(4px);
}

/* ── Pulse (subtle) ── */
@keyframes subtlePulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

.pulse-subtle {
  animation: subtlePulse 3s ease-in-out infinite;
}

/* ── Shimmer (loading skeleton) ── */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--gray-100) 25%,
    var(--gray-200) 50%,
    var(--gray-100) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

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

  .reveal,
  .reveal-stagger > *,
  .fade-in,
  .scale-in {
    opacity: 1;
    transform: none;
  }

  .hero-text-reveal {
    opacity: 1;
    transform: none;
    animation: none;
  }

  .whatsapp-fab {
    animation: none;
  }
}