.quiz-card {
  margin: 1.5rem 0;
  perspective: 1000px;
}

.quiz-card-inner {
  position: relative;
  width: 100%;
  background: var(--kira-card-bg, #fff);
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transform-style: preserve-3d;
  transition: transform 0.5s;
}

.quiz-card-inner.is-flipped {
  transform: rotateY(180deg);
}

.quiz-card-face {
  position: relative;
  padding: 1rem 1.25rem;
  backface-visibility: hidden;
}

.quiz-card-front {
}

.quiz-card-back {
  position: absolute;
  inset: 0;
  transform: rotateY(180deg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.quiz-question {
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.quiz-options {
  list-style: none;
  padding: 0;
  margin: 0 0 0.75rem;
}

.quiz-options li + li {
  margin-top: 0.4rem;
}

.quiz-options label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
}

.quiz-options input[type='radio'] {
  accent-color: var(--kira-primary, #6599b3);
}

.quiz-option-text {
  flex: 1;
}

.quiz-btn {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  font-size: 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--kira-primary, #6599b3);
  background: var(--kira-primary, #6599b3);
  color: #fff;
  cursor: pointer;
}

.quiz-btn + .quiz-btn {
  margin-left: 0.5rem;
}

.quiz-btn-back {
  margin-top: 0.75rem;
  background: #fff;
  color: var(--kira-primary, #6599b3);
}

.quiz-result {
  font-weight: 600;
}

.quiz-result.is-correct {
  color: #2e8b57;
}

.quiz-result.is-wrong {
  color: #b22222;
}
.quiz-btn-box {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.quiz-btn-explain.hidden {
  display: none;
}

.quiz-explain {
  max-width: 90%;
  font-size: 0.95rem;
  line-height: 1.6;
  color: #333;
  background: rgba(255,255,255,0.8);
  border-radius: 8px;
  padding: 1rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}