.study-completion-celebration {
  position: fixed;
  z-index: 2600;
  inset: 0;
  display: grid;
  place-items: center;
  box-sizing: border-box;
  max-width: 100vw;
  max-height: 100dvh;
  padding:
    max(var(--space-16), env(safe-area-inset-top))
    max(var(--space-12), env(safe-area-inset-right))
    max(var(--space-16), env(safe-area-inset-bottom))
    max(var(--space-12), env(safe-area-inset-left));
  overflow: hidden;
  pointer-events: none;
  contain: layout paint;
}

.study-completion-celebration__image {
  position: relative;
  z-index: 2;
  display: block;
  width: min(92vw, 760px);
  max-width: 100%;
  max-height: min(58vh, 560px);
  object-fit: contain;
  transform-origin: 50% 58%;
  animation: study-completion-character-pop 900ms cubic-bezier(0.2, 0.8, 0.2, 1)
    both;
  filter: drop-shadow(0 12px 18px rgba(0, 0, 0, 0.2));
}

.study-completion-celebration__particles {
  position: absolute;
  inset: 0;
  z-index: 1;
  overflow: hidden;
}

.study-completion-celebration__particle {
  position: absolute;
  top: 50%;
  left: 50%;
  display: block;
  font-size: clamp(18px, 6vw, 36px);
  line-height: 1;
  opacity: 0;
  will-change: transform, opacity;
  animation:
    study-completion-particle-burst 1500ms ease-out
      var(--celebration-delay) both,
    study-completion-particle-twinkle 900ms ease-in-out
      calc(1500ms + var(--celebration-delay)) infinite alternate;
}

.study-completion-celebration__status {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@keyframes study-completion-character-pop {
  0% {
    opacity: 0;
    transform: scale(0.35) translateY(24px);
  }

  56% {
    opacity: 1;
    transform: scale(1.08) translateY(-8px);
  }

  76% {
    transform: scale(0.96) translateY(2px);
  }

  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

@keyframes study-completion-particle-burst {
  0% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.2) rotate(0deg);
  }

  20% {
    opacity: 1;
  }

  100% {
    opacity: 0;
    transform:
      translate(
        calc(-50% + var(--celebration-x)),
        calc(-50% + var(--celebration-y))
      )
      scale(1.05)
      rotate(var(--celebration-rotate));
  }
}

@keyframes study-completion-particle-twinkle {
  from {
    opacity: 0.35;
  }

  to {
    opacity: 1;
  }
}

@media (max-width: 420px) {
  .study-completion-celebration__image {
    width: 96vw;
    max-height: 48vh;
  }
}

@media (prefers-reduced-motion: reduce) {
  .study-completion-celebration__image {
    animation: study-completion-character-fade 500ms ease-out both;
  }

  .study-completion-celebration__particle {
    animation: study-completion-particle-fade 700ms ease-out
      var(--celebration-delay) both;
  }
}

@keyframes study-completion-character-fade {
  from {
    opacity: 0;
    transform: scale(0.94);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes study-completion-particle-fade {
  0%,
  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.9);
  }

  35%,
  70% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}