/* ============================================
   ANIMATIONS — Keyframes & motion utilities
   ============================================ */

@keyframes gradientShift {
  0% { filter: hue-rotate(0deg) brightness(1); }
  100% { filter: hue-rotate(8deg) brightness(1.05); }
}

@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(10vw, 5vh) scale(1.1); }
  66% { transform: translate(-5vw, 10vh) scale(0.95); }
  100% { transform: translate(5vw, -5vh) scale(1.05); }
}

@keyframes btnShimmer {
  0%, 100% { transform: translateX(-100%); }
  50% { transform: translateX(100%); }
}

@keyframes trailFade {
  0% {
    opacity: 0.9;
    transform: translate(-50%, -50%) scale(1) rotate(0deg);
  }
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.3) translateY(-30px) rotate(20deg);
  }
}

@keyframes floatHeart {
  0% {
    transform: translateY(100vh) translateX(0) rotate(0deg);
    opacity: 0;
  }
  10% { opacity: var(--opacity, 0.3); }
  90% { opacity: var(--opacity, 0.3); }
  100% {
    transform: translateY(-10vh) translateX(var(--drift, 20px)) rotate(360deg);
    opacity: 0;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes pulseGlow {
  0%, 100% {
    transform: scale(1);
    filter: drop-shadow(0 0 20px rgba(255, 51, 102, 0.6));
  }
  50% {
    transform: scale(1.08);
    filter: drop-shadow(0 0 40px rgba(255, 51, 102, 0.9));
  }
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  14% { transform: scale(1.15); }
  28% { transform: scale(1); }
  42% { transform: scale(1.1); }
  70% { transform: scale(1); }
}

@keyframes candleFlicker {
  0%, 100% { transform: scaleY(1) scaleX(1); opacity: 1; }
  50% { transform: scaleY(1.1) scaleX(0.9); opacity: 0.85; }
}

@keyframes cinematicReveal {
  from {
    opacity: 0;
    transform: translateY(30px);
    filter: blur(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0);
  }
}

@keyframes finalGlowPulse {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.05); }
}

@keyframes starTwinkle {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes photoReveal {
  from {
    opacity: 0;
    transform: scale(0.85) rotate(-2deg);
  }
  to {
    opacity: 1;
    transform: scale(1) rotate(0deg);
  }
}

/* Staggered entrance animations */
.animate-in {
  opacity: 0;
  animation: fadeInUp 0.9s var(--ease-out-expo) forwards;
}

.animate-in.delay-1 { animation-delay: 0.15s; }
.animate-in.delay-2 { animation-delay: 0.3s; }
.animate-in.delay-3 { animation-delay: 0.45s; }
.animate-in.delay-4 { animation-delay: 0.6s; }

.screen--active .animate-in {
  animation-play-state: running;
}

.screen:not(.screen--active) .animate-in {
  animation: none;
  opacity: 0;
}

/* Cinematic screen animations */
.animate-cinematic {
  opacity: 0;
}

.screen--active .animate-cinematic {
  animation: cinematicReveal 1.4s var(--ease-out-expo) forwards;
}

.screen--active .animate-cinematic.delay-1 { animation-delay: 0.8s; }
.screen--active .animate-cinematic.delay-2 { animation-delay: 1.6s; }
.screen--active .animate-cinematic.delay-3 { animation-delay: 2.4s; }

.screen:not(.screen--active) .animate-cinematic {
  animation: none;
  opacity: 0;
}

/* Heart pulse on forever screen */
.heart-pulse-large {
  font-size: 4rem;
  animation: heartbeat 1.2s ease-in-out infinite;
  filter: drop-shadow(0 0 30px rgba(255, 51, 102, 0.8));
}

.screen:not(.screen--active) .heart-pulse-large {
  animation: none;
}

/* Reason cards stagger */
.reason-item {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease-out-expo), transform 0.6s var(--ease-out-expo);
}

.screen--active .reason-item.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Timeline items */
.timeline-item {
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo);
}

.screen--active .timeline-item.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Photo cards */
.photo-card {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo);
}

.screen--active .photo-card.visible {
  opacity: 1;
  transform: scale(1);
}

.photo-card:hover {
  transform: scale(1.03);
  box-shadow: var(--glow-pink);
}

/* Promise cards */
.promise-card {
  opacity: 0;
  transform: translateY(20px) scale(0.95);
  transition: opacity 0.6s var(--ease-out-expo), transform 0.6s var(--ease-out-expo);
}

.screen--active .promise-card.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}