body {
  font-family: "Inter", sans-serif;
}

.perspective {
  perspective: 1000px;
}

.transform-style-preserve-3d {
  transform-style: preserve-3d;
}

.backface-hidden {
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  /* Safari */
}

.rotate-y-180 {
  transform: rotateY(180deg);
}

/* Flashcard styles */
.flashcard-container {
  perspective: 1000px;
  width: 100%;
  max-width: 600px;
  height: 400px;
  cursor: pointer;
  margin: 0 auto;
}

.flashcard {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  border-radius: 0.5rem;
}

.flipped .flashcard {
  transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border-radius: 0.5rem;
  overflow: hidden;
}

.flashcard-front {
  z-index: 2;
}

.flashcard-back {
  transform: rotateY(180deg);
}

/* Card hover effect */
.flashcard-container:hover .flashcard {
  box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

/* Responsive adjustments */
@media (max-width: 640px) {
  .flashcard-container {
    height: 350px;
  }
}

/* Slide animations */
@keyframes slide-in-right {
  from {
    transform: translateX(100%);
    opacity: 0;
  }

  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.animate-slide-in-right {
  animation: slide-in-right 0.5s ease-out forwards;
}

@keyframes slide-in-left {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }

  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.animate-slide-in-left {
  animation: slide-in-left 0.5s ease-out forwards;
}

@keyframes slide-out-left {
  from {
    transform: translateX(0);
    opacity: 1;
  }

  to {
    transform: translateX(-100%);
    opacity: 0;
  }
}

.animate-slide-out-left {
  animation: slide-out-left 0.5s ease-in forwards;
}

@keyframes slide-out-right {
  from {
    transform: translateX(0);
    opacity: 1;
  }

  to {
    transform: translateX(100%);
    opacity: 0;
  }
}

.animate-slide-out-right {
  animation: slide-out-right 0.5s ease-in forwards;
}