/**
 * =========================================================================
 * WEDDING INVITATION ANIMATIONS & TRANSITIONS
 * =========================================================================
 * Buttery-smooth 60fps hardware-accelerated animations
 */

/* 1. Slow Zoom / Ken Burns Effect for Cover & Hero */
@keyframes kenBurnsSlow {
  0% {
    transform: scale(1) translate3d(0, 0, 0);
  }
  50% {
    transform: scale(1.08) translate3d(-1%, -1%, 0);
  }
  100% {
    transform: scale(1) translate3d(0, 0, 0);
  }
}

.animate-kenburns {
  animation: kenBurnsSlow 24s ease-in-out infinite alternate;
  will-change: transform;
}

/* 2. Floating Gold Dust Particles */
@keyframes floatUpAndDrift {
  0% {
    transform: translateY(0) translateX(0);
    opacity: 0;
  }
  20% {
    opacity: 0.8;
  }
  80% {
    opacity: 0.6;
  }
  100% {
    transform: translateY(-80px) translateX(20px);
    opacity: 0;
  }
}

.particle-dot {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, #f9f4ea 0%, #c5a880 70%, transparent 100%);
  pointer-events: none;
  animation: floatUpAndDrift linear infinite;
}

/* 3. Cover Dismiss / Curtain Reveal */
.cover-screen {
  transition: transform 1s cubic-bezier(0.77, 0, 0.175, 1), opacity 0.8s ease;
  will-change: transform, opacity;
}

.cover-dismissed {
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

/* 4. Intersection Observer Scroll Reveals */
.scroll-reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1), transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.scroll-reveal-scale {
  opacity: 0;
  transform: scale(0.94);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1), transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.scroll-reveal-scale.revealed {
  opacity: 1;
  transform: scale(1);
}

.scroll-reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1), transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.scroll-reveal-left.revealed {
  opacity: 1;
  transform: translateX(0);
}

.scroll-reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1), transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.scroll-reveal-right.revealed {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger delays */
.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }
.delay-400 { transition-delay: 400ms; }
.delay-500 { transition-delay: 500ms; }

/* 5. Vinyl Disc Rotation */
@keyframes spinVinyl {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.is-spinning {
  animation: spinVinyl 5s linear infinite;
}

/* 6. Sound Wave Equalizer Bars */
@keyframes soundEqualizer {
  0%, 100% {
    height: 4px;
  }
  50% {
    height: 18px;
  }
}

.sound-waves {
  display: inline-flex;
  align-items: flex-end;
  gap: 2.5px;
  height: 20px;
}

.sound-waves span {
  width: 2.5px;
  height: 4px;
  background-color: var(--color-champagne-gold, #c5a880);
  border-radius: 2px;
  transition: height 0.2s ease;
}

.sound-waves.is-active span:nth-child(1) {
  animation: soundEqualizer 1s ease-in-out infinite 0.1s;
}
.sound-waves.is-active span:nth-child(2) {
  animation: soundEqualizer 0.8s ease-in-out infinite 0.3s;
}
.sound-waves.is-active span:nth-child(3) {
  animation: soundEqualizer 1.2s ease-in-out infinite 0.2s;
}
.sound-waves.is-active span:nth-child(4) {
  animation: soundEqualizer 0.9s ease-in-out infinite 0.4s;
}

/* 7. Countdown Digit Pulse */
@keyframes digitPulseAnim {
  0% {
    transform: scale(1);
    opacity: 0.7;
  }
  50% {
    transform: scale(1.08);
    opacity: 1;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.digit-pulse {
  animation: digitPulseAnim 0.3s ease-out;
}

/* 8. Shimmer / Glass Light Sweep */
@keyframes lightSweep {
  0% {
    transform: translateX(-150%) skewX(-20deg);
  }
  100% {
    transform: translateX(250%) skewX(-20deg);
  }
}

.shimmer-effect {
  position: relative;
  overflow: hidden;
}

.shimmer-effect::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.18), transparent);
  animation: lightSweep 4.5s infinite;
  pointer-events: none;
}

/* 9. Confetti Fall */
@keyframes confettiFall {
  0% {
    transform: translateY(-20px) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translateY(105vh) rotate(720deg);
    opacity: 0;
  }
}

.confetti-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 99999;
  overflow: hidden;
}

.confetti-piece {
  position: absolute;
  top: -10px;
  border-radius: 2px;
  animation: confettiFall 2.5s ease-out forwards;
}

/* 10. Pulse Glow */
@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(197, 168, 128, 0.4);
  }
  50% {
    box-shadow: 0 0 0 14px rgba(197, 168, 128, 0);
  }
}

.pulse-glow {
  animation: pulseGlow 2.5s infinite;
}

/* 11. Spinner for Button Loading */
@keyframes spinFast {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.btn-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spinFast 0.8s linear infinite;
  margin-right: 8px;
}