/* ========================================================
   WEDDING ANIMATIONS - ĐỨC NGỌC & THỊ CƠ (11/01/2027)
   ======================================================== */

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translate3d(0, 30px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

@keyframes pulseHeart {
  0% { transform: scale(1); }
  14% { transform: scale(1.18); }
  28% { transform: scale(1); }
  42% { transform: scale(1.18); }
  70% { transform: scale(1); }
}

@keyframes floatSlow {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-6px) rotate(0.8deg); }
}

@keyframes spinSlow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes rippleWave {
  0% {
    box-shadow: 0 0 0 0 rgba(191, 160, 93, 0.5), 0 0 0 0 rgba(223, 158, 155, 0.4);
  }
  70% {
    box-shadow: 0 0 0 14px rgba(191, 160, 93, 0), 0 0 0 24px rgba(223, 158, 155, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(191, 160, 93, 0), 0 0 0 0 rgba(223, 158, 155, 0);
  }
}

@keyframes equalizer {
  0%, 100% { height: 3px; }
  50% { height: 16px; }
}

/* VỆT SÁNG LƯỚT QUA NÚT BẤM (SHIMMER LIGHT SWEEP) */
.btn-primary, .btn-open-gold, .btn-rsvp-submit {
  position: relative;
  overflow: hidden;
}

.btn-primary::after, .btn-open-gold::after, .btn-rsvp-submit::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -100%;
  width: 60%;
  height: 200%;
  background: linear-gradient(
    60deg,
    rgba(255, 255, 255, 0) 20%,
    rgba(255, 255, 255, 0.45) 50%,
    rgba(255, 255, 255, 0) 80%
  );
  transform: rotate(25deg);
  animation: buttonShimmer 3.8s infinite cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

@keyframes buttonShimmer {
  0% { left: -100%; }
  35% { left: 160%; }
  100% { left: 160%; }
}

/* Scroll reveal classes */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s cubic-bezier(0.25, 1, 0.5, 1), transform 0.8s cubic-bezier(0.25, 1, 0.5, 1);
  will-change: opacity, transform;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.12s; }
.reveal-delay-2 { transition-delay: 0.24s; }
.reveal-delay-3 { transition-delay: 0.36s; }
.reveal-delay-4 { transition-delay: 0.48s; }

/* Interactive Floating Hearts */
.flying-heart {
  position: fixed;
  font-size: 19px;
  color: #df9e9b;
  pointer-events: none;
  z-index: 99999;
  animation: flyUp 2.2s cubic-bezier(0.2, 0.8, 0.3, 1) forwards;
}

@keyframes flyUp {
  0% {
    opacity: 1;
    transform: translateY(0) scale(0.6) rotate(0deg);
  }
  50% {
    opacity: 0.9;
    transform: translateY(-80px) scale(1.15) rotate(12deg);
  }
  100% {
    opacity: 0;
    transform: translateY(-160px) scale(0.85) rotate(-18deg);
  }
}