/* ==========================================================================
   BOOKSTREET.IN - Animations & Micro-interactions
   Quietly impressive, smooth, and refined
   ========================================================================== */

/* Fade Up Entrance for Scroll Reveal */
.reveal-fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

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

.reveal-fade-in {
  opacity: 0;
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity;
}

.reveal-fade-in.is-visible {
  opacity: 1;
}

.reveal-scale-up {
  opacity: 0;
  transform: scale(0.94);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.reveal-scale-up.is-visible {
  opacity: 1;
  transform: scale(1);
}

/* Stagger Delays */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }
.delay-5 { transition-delay: 0.5s; }

/* Subtle Gentle Floating */
@keyframes softFloat {
  0% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-6px) rotate(0.5deg); }
  100% { transform: translateY(0) rotate(0deg); }
}

.anim-soft-float {
  animation: softFloat 5s ease-in-out infinite;
}

/* Airplane Animation along Flight Trail */
@keyframes planeFly {
  0% {
    offset-distance: 0%;
    opacity: 0;
  }
  10% {
    opacity: 1;
  }
  85% {
    opacity: 1;
  }
  100% {
    offset-distance: 100%;
    opacity: 0;
  }
}

.flying-plane-icon {
  offset-path: path("M 10 90 Q 90 20 220 50 T 360 30");
  animation: planeFly 7s linear infinite;
}

/* Magnetic Button Hover Glow */
.magnetic-btn {
  position: relative;
  overflow: hidden;
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.magnetic-btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 120%;
  height: 120%;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
  transform: translate(-50%, -50%) scale(0);
  transition: transform 0.5s ease-out;
  pointer-events: none;
}

.magnetic-btn:hover::after {
  transform: translate(-50%, -50%) scale(1);
}

/* Pulse Glow for Live Reel or Badge */
@keyframes liveDotPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(194, 155, 56, 0.6);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(194, 155, 56, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(194, 155, 56, 0);
  }
}

.live-indicator-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-gold);
  animation: liveDotPulse 2s infinite;
}

/* Heart burst animation for liking reels/posts */
@keyframes heartBurst {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  50% {
    transform: scale(1.4);
    opacity: 1;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.heart-burst {
  animation: heartBurst 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

/* ==========================================================================
   Artisanal Parchment Image Lazy-Loading Reveal (60fps GPU, Zero Stutter)
   ========================================================================== */
img[loading="lazy"] {
  opacity: 0;
  filter: blur(6px);
  transform: scale(0.985);
  transition: opacity 0.5s cubic-bezier(0.2, 0.9, 0.3, 1),
              filter 0.5s ease,
              transform 0.5s cubic-bezier(0.2, 0.9, 0.3, 1);
  will-change: opacity, filter, transform;
}

img[loading="lazy"].img-loaded {
  opacity: 1;
  filter: blur(0);
  transform: scale(1);
  will-change: auto;
}

/* Warm Parchment Skeleton Shimmer on book cover & photo wraps */
.polaroid-tile,
.globe-image-wrapper,
.drawer-book-cover-wrap {
  position: relative;
  background-color: #F2EDE4;
}

.flatlay-book::before,
.polaroid-tile::before,
.globe-image-wrapper::before,
.drawer-book-cover-wrap::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(184, 139, 74, 0.08) 50%,
    transparent 100%
  );
  background-size: 200% 100%;
  animation: parchmentShimmer 1.8s infinite ease-in-out;
  pointer-events: none;
  z-index: 1;
  border-radius: inherit;
  transition: opacity 0.4s ease;
}

.flatlay-book.is-loaded::before,
.polaroid-tile.is-loaded::before,
.globe-image-wrapper.is-loaded::before,
.drawer-book-cover-wrap.is-loaded::before {
  opacity: 0;
  animation: none;
}

@keyframes parchmentShimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* Respect 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-fade-up,
  .reveal-fade-in,
  .reveal-scale-up {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}