.flashcard-container {
  max-width: 800px;
  margin: 2rem auto;
  padding: 1rem;
}

.flashcard-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 2rem 0;
  gap: 1rem;
}

.flashcard-controls button {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  background: #2c3e50;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s ease;
}

.flashcard-controls button:hover {
  background: #34495e;
}

.flashcard-controls button:disabled {
  background: #95a5a6;
  cursor: not-allowed;
}

#card-counter {
  font-size: 1.1rem;
  font-weight: bold;
  color: #2c3e50;
}

.flashcard-wrapper {
  position: relative;
  width: 100%;
  min-height: 400px;
  perspective: 1000px;
}

.flashcard {
  position: absolute;
  width: 100%;
  min-height: 400px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.flashcard.active {
  opacity: 1;
  pointer-events: auto;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  min-height: 400px;
  text-align: center;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  cursor: pointer;
}

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

.flashcard-front,
.flashcard-back {
  position: absolute;
  width: 100%;
  min-height: 400px;
  backface-visibility: hidden;
  border: 2px solid #2c3e50;
  border-radius: 12px;
  padding: 2rem;
  background: white;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.flashcard-back {
  transform: rotateY(180deg);
  background: #ecf0f1;
}

.flashcard-content {
  font-size: 1.2rem;
  line-height: 1.6;
  color: #2c3e50;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.flip-hint {
  font-size: 0.9rem;
  color: #95a5a6;
  margin-top: 1rem;
  font-style: italic;
}

@media (max-width: 768px) {
  .flashcard-container {
    padding: 0.5rem;
  }

  .flashcard-controls {
    flex-direction: column;
    gap: 0.5rem;
  }

  .flashcard-controls button {
    width: 100%;
  }

  .flashcard-front,
  .flashcard-back {
    min-height: 300px;
    padding: 1.5rem;
  }

  .flashcard-content {
    font-size: 1rem;
  }
}