/* ==========================================================================
   Romantic Animations & Keyframes
   ========================================================================== */

/* Cinematic Entrance for Hero */
@keyframes heroEntrance {
  0% {
    opacity: 0;
    transform: translateY(30px) scale(0.96);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Background Slow Zoom / Ken Burns Effect */
@keyframes slowZoom {
  0% {
    transform: scale(1);
  }
  100% {
    transform: scale(1.12);
  }
}

/* Heartbeat / Pulse */
@keyframes pulseBeat {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.18);
  }
}

/* Audio Visualizer Waves */
@keyframes visualizerAnim {
  0% {
    height: 4px;
  }
  100% {
    height: 16px;
  }
}

/* Zoom In for Lightbox */
@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Envelope Letter Slide Down */
@keyframes letterSlideDown {
  0% {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Rotating Ambient Glow */
@keyframes rotateGlow {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Shimmer Highlight Effect */
@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }
  100% {
    background-position: 200% 0;
  }
}

/* Scroll Trigger Reveal Classes */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(35px);
  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-on-scroll.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* 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; }

/* Interactive Click Heart Burst */
.click-heart {
  position: fixed;
  pointer-events: none;
  font-size: 20px;
  color: #e85d75;
  user-select: none;
  z-index: 9999;
  animation: heartFloatUp 1.2s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

@keyframes heartFloatUp {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(0.6) rotate(0deg);
  }
  50% {
    opacity: 0.9;
    transform: translate(calc(-50% + var(--dx, 0px)), calc(-50% - 40px)) scale(1.3) rotate(var(--rot, 15deg));
  }
  100% {
    opacity: 0;
    transform: translate(calc(-50% + var(--dx, 0px)), calc(-50% - 90px)) scale(0.9) rotate(var(--rot, 30deg));
  }
}