/* Screen transitions */
.screen-enter {
  animation: screenEnter 0.4s ease forwards;
}

.screen-exit {
  animation: screenExit 0.3s ease forwards;
}

@keyframes screenEnter {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes screenExit {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-20px);
  }
}

/* Fade in */
.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

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

/* Scale bounce */
.bounce-in {
  animation: bounceIn 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55) forwards;
}

@keyframes bounceIn {
  from {
    opacity: 0;
    transform: scale(0.3);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Pulse */
.pulse {
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

/* Float */
.float {
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Wiggle */
.wiggle {
  animation: wiggle 0.5s ease-in-out;
}

@keyframes wiggle {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(-5deg); }
  75% { transform: rotate(5deg); }
}

/* Star collect animation */
.star-collect {
  animation: starCollect 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes starCollect {
  0% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
  50% {
    opacity: 1;
    transform: scale(1.5) translateY(-20px);
  }
  100% {
    opacity: 0;
    transform: scale(0.5) translateY(-60px);
  }
}

/* Confetti */
.confetti-piece {
  position: fixed;
  width: 10px;
  height: 10px;
  border-radius: 2px;
  animation: confettiFall var(--fall-duration, 3s) linear forwards;
  z-index: 1000;
  pointer-events: none;
}

@keyframes confettiFall {
  0% {
    opacity: 1;
    transform: translateY(-100vh) rotate(0deg);
  }
  100% {
    opacity: 0;
    transform: translateY(100vh) rotate(720deg);
  }
}

/* Glow pulse (for active elements) */
.glow-pulse {
  animation: glowPulse 2s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 5px rgba(74, 144, 217, 0.3); }
  50% { box-shadow: 0 0 20px rgba(74, 144, 217, 0.6); }
}

/* Slide in from left */
.slide-in-left {
  animation: slideInLeft 0.4s ease forwards;
}

@keyframes slideInLeft {
  from { transform: translateX(-100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Slide in from right */
.slide-in-right {
  animation: slideInRight 0.4s ease forwards;
}

@keyframes slideInRight {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* Shake (wrong answer) */
.shake {
  animation: shake 0.5s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}

/* Blink (mascot eyes) */
.blink {
  animation: blink 4s ease-in-out infinite;
}

@keyframes blink {
  0%, 45%, 55%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(0.1); }
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  animation: fadeIn 0.3s ease forwards;
}

.stagger-children > *:nth-child(1) { animation-delay: 0.1s; }
.stagger-children > *:nth-child(2) { animation-delay: 0.2s; }
.stagger-children > *:nth-child(3) { animation-delay: 0.3s; }
.stagger-children > *:nth-child(4) { animation-delay: 0.4s; }
.stagger-children > *:nth-child(5) { animation-delay: 0.5s; }
.stagger-children > *:nth-child(6) { animation-delay: 0.6s; }