h1, h2 {
  text-align: center;
}

.card-counter {
  text-align: center;
  color: var(--muted);
  margin-bottom: var(--space-2);
}

.flashcard-wrap {
  perspective: 1000px;
  max-width: 500px;
  height: 200px;
  margin: 0 auto var(--space-2);
  cursor: pointer;
}

.flashcard {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.4s ease;
}

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

.flashcard-front,
.flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border: var(--border);
  border-radius: 0.5rem;
  padding: var(--space-2);
  box-sizing: border-box;
  text-align: center;
  font-size: 1.1rem;
  background: var(--bg);
  box-shadow: var(--shadow);
}

.flashcard-back {
  transform: rotateY(180deg);
  background: #f0f7ff;
}

.card-controls,
.mark-controls {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.btn-secondary {
  background: #555555;
}

.btn-secondary:hover {
  background: #333333;
}

.btn-got {
  background: #2e7d32;
}

.btn-got:hover {
  background: #1b5e20;
}

.btn-missed {
  background: #c62828;
}

.btn-missed:hover {
  background: #8e0000;
}

.score-display {
  text-align: center;
  font-size: 1.1rem;
  margin-bottom: var(--space-3);
}

.form-error {
  color: #c62828;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.card-list {
  list-style: none;
  padding: 0;
  margin-top: var(--space-2);
}

.card-list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  text-align: left;
  padding: var(--space-1) var(--space-2);
  border: var(--border);
  border-radius: 0.25rem;
  margin-bottom: var(--space-1);
}

.btn-delete {
  background: #c62828;
  flex-shrink: 0;
  margin-left: var(--space-2);
}

.btn-delete:hover {
  background: #8e0000;
}

@media (max-width: 480px) {
  .flashcard-wrap {
    height: 160px;
  }

  .card-controls,
  .mark-controls {
    flex-wrap: wrap;
  }
}