/* Kausianimaatio etusivun lataukseen. */
#seasonal-entry-overlay {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 9998;
}

.seasonal-entry-item {
  position: absolute;
  top: -90px;
  width: var(--size);
  height: var(--size);
  opacity: 0;
  pointer-events: none;
  user-select: none;
  will-change: transform, opacity;
  transform-origin: 50% 50%;
}

.seasonal-entry-item img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 2px 2px rgba(0,0,0,.12));
}

.seasonal-entry-item.autumn {
  animation: lkAutumnFall var(--duration) linear var(--delay) forwards;
}

@keyframes lkAutumnFall {
  0% { opacity: 0; transform: translate3d(0,-30px,0) rotate(0deg); }
  8% { opacity: .96; }
  35% { transform: translate3d(calc(var(--drift) * .35),35vh,0) rotate(calc(var(--turn) * .45)); }
  70% { transform: translate3d(calc(var(--drift) * -.15),74vh,0) rotate(calc(var(--turn) * .78)); }
  100% { opacity: .18; transform: translate3d(var(--drift),112vh,0) rotate(var(--turn)); }
}

.seasonal-entry-item.winter {
  animation: lkSnowFall var(--duration) linear var(--delay) forwards;
}

@keyframes lkSnowFall {
  0% { opacity: 0; transform: translate3d(0,-20px,0) rotate(0deg); }
  8% { opacity: .9; }
  50% { transform: translate3d(calc(var(--drift) * .45),53vh,0) rotate(calc(var(--turn) * .45)); }
  100% { opacity: .3; transform: translate3d(var(--drift),110vh,0) rotate(var(--turn)); }
}

.seasonal-entry-item.spring {
  animation: lkSpringFloat var(--duration) ease-in-out var(--delay) forwards;
}

@keyframes lkSpringFloat {
  0% { opacity: 0; transform: translate3d(0,-25px,0) rotate(-12deg); }
  10% { opacity: .95; }
  32% { transform: translate3d(calc(var(--drift) * .6),32vh,0) rotate(80deg); }
  66% { transform: translate3d(calc(var(--drift) * -.25),68vh,0) rotate(185deg); }
  100% { opacity: .12; transform: translate3d(var(--drift),108vh,0) rotate(var(--turn)); }
}

.seasonal-entry-item.summer {
  top: var(--start-y);
  left: -90px !important;
  animation: lkButterflyFly var(--duration) ease-in-out var(--delay) forwards;
}

.seasonal-entry-item.summer img {
  animation: lkWingPulse .48s ease-in-out infinite alternate;
}

@keyframes lkWingPulse {
  from { transform: scaleX(.76) rotate(-3deg); }
  to { transform: scaleX(1.05) rotate(3deg); }
}

@keyframes lkButterflyFly {
  0% { opacity: 0; transform: translate3d(-5vw,0,0) rotate(-7deg); }
  8% { opacity: .95; }
  24% { transform: translate3d(28vw,-30px,0) rotate(8deg); }
  48% { transform: translate3d(52vw,22px,0) rotate(-5deg); }
  72% { transform: translate3d(78vw,-20px,0) rotate(7deg); }
  100% { opacity: .15; transform: translate3d(116vw,18px,0) rotate(-3deg); }
}

@media (prefers-reduced-motion: reduce) {
  #seasonal-entry-overlay { display: none !important; }
}