/* Quiz Modal Overlay System */
.quiz-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.85);
  z-index: 1100; /* Higher than storybook modal */
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  backdrop-filter: blur(2px);
}

.quiz-modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* Quiz Modal Container */
.quiz-modal-container {
  background: white;
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  max-width: 90vw;
  max-height: 90vh;
  width: 800px;
  min-height: 400px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.9) translateY(20px);
  transition: transform 0.3s ease;
  position: relative;
}

.quiz-modal-overlay.active .quiz-modal-container {
  transform: scale(1) translateY(0);
}

/* Wider container for matching questions */
.quiz-modal-container.matching-mode {
  width: 1000px;
  max-width: 95vw;
}

/* Quiz Modal Header */
.quiz-modal-header {
  padding: 24px;
  border-bottom: 1px solid #e5e7eb;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.quiz-modal-title {
  font-size: 24px;
  font-weight: 600;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.quiz-modal-title::before {
  content: "🎯";
  font-size: 28px;
}

.quiz-modal-close {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: white;
  font-size: 24px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s ease;
}

.quiz-modal-close:hover {
  background: rgba(255, 255, 255, 0.3);
}

/* Quiz Modal Content */
.quiz-modal-content {
  flex: 1;
  overflow-y: auto;
  padding: 0;
  display: flex;
  flex-direction: column;
}

/* Quiz Loading State */
.quiz-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px;
  color: #6b7280;
}

.quiz-loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #e5e7eb;
  border-top: 4px solid #667eea;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 16px;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Quiz Interface Styles */
.quiz-interface {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.quiz-progress {
  padding: 16px 24px;
  background: #f8fafc;
  border-bottom: 1px solid #e5e7eb;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: #6b7280;
}

.quiz-progress-bar {
  flex: 1;
  height: 4px;
  background: #e5e7eb;
  border-radius: 2px;
  margin: 0 16px;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
  border-radius: 2px;
  transition: width 0.3s ease;
}

/* Question Container */
.quiz-question-container {
  flex: 1;
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.quiz-question-text {
  font-size: 20px;
  font-weight: 600;
  color: #111827;
  line-height: 1.4;
  margin: 0;
}

/* Multiple Choice Questions */
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quiz-option {
  display: flex;
  align-items: center;
  padding: 16px;
  background: #f8fafc;
  border: 2px solid #e5e7eb;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.quiz-option:hover {
  background: #e0e7ff;
  border-color: #c7d2fe;
}

.quiz-option.selected {
  background: #dbeafe;
  border-color: #3b82f6;
}

.quiz-option input[type="radio"] {
  margin-right: 12px;
  transform: scale(1.2);
}

.quiz-option-text {
  flex: 1;
  font-size: 16px;
  color: #374151;
}

/* True/False Questions */
.quiz-true-false {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.quiz-tf-option {
  flex: 1;
  max-width: 200px;
  padding: 24px;
  text-align: center;
  border: 3px solid #e5e7eb;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.2s ease;
  background: white;
}

.quiz-tf-option.true-option {
  border-color: #10b981;
  color: #10b981;
}

.quiz-tf-option.false-option {
  border-color: #ef4444;
  color: #ef4444;
}

.quiz-tf-option.selected.true-option {
  background: #d1fae5;
  border-color: #059669;
}

.quiz-tf-option.selected.false-option {
  background: #fee2e2;
  border-color: #dc2626;
}

.quiz-tf-icon {
  font-size: 32px;
  display: block;
  margin-bottom: 8px;
}

/* Fill in the Blank Questions */
.quiz-fill-blank {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.quiz-fill-input {
  padding: 16px;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.2s ease;
}

.quiz-fill-input:focus {
  outline: none;
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Matching Questions */
.quiz-matching {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  min-height: 400px;
}

.quiz-matching-column {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quiz-matching-header {
  font-weight: 600;
  color: #374151;
  text-align: center;
  padding: 12px;
  background: #f3f4f6;
  border-radius: 8px;
  margin-bottom: 8px;
}

.quiz-matching-item {
  padding: 16px;
  background: white;
  border: 2px solid #e5e7eb;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
  position: relative;
}

.quiz-matching-item:hover {
  border-color: #3b82f6;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.1);
}

.quiz-matching-item.selected {
  background: #dbeafe;
  border-color: #3b82f6;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.quiz-matching-item.matched {
  background: #d1fae5;
  border-color: #10b981;
  opacity: 0.7;
  cursor: not-allowed;
}

/* Quiz Navigation */
.quiz-navigation {
  padding: 24px;
  border-top: 1px solid #e5e7eb;
  background: #f8fafc;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.quiz-nav-button {
  padding: 12px 24px;
  background: #667eea;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.quiz-nav-button:hover {
  background: #5a67d8;
}

.quiz-nav-button:disabled {
  background: #9ca3af;
  cursor: not-allowed;
}

.quiz-nav-button.secondary {
  background: #6b7280;
}

.quiz-nav-button.secondary:hover {
  background: #4b5563;
}

/* Quiz Results */
.quiz-results {
  text-align: center;
  padding: 40px;
}

.quiz-score {
  font-size: 48px;
  font-weight: bold;
  color: #10b981;
  margin-bottom: 16px;
}

.quiz-score.failing {
  color: #ef4444;
}

.quiz-results-message {
  font-size: 18px;
  color: #6b7280;
  margin-bottom: 32px;
}

/* Responsive Design */
@media (max-width: 768px) {
  .quiz-modal-container {
    width: 95vw;
    margin: 16px;
    max-height: 85vh;
  }

  .quiz-modal-container.matching-mode {
    width: 95vw;
  }

  .quiz-matching {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .quiz-question-container {
    padding: 20px;
  }

  .quiz-modal-header {
    padding: 16px;
  }

  .quiz-modal-title {
    font-size: 20px;
  }
}

/* Focus States for Accessibility */
.quiz-option:focus-within,
.quiz-tf-option:focus,
.quiz-matching-item:focus {
  outline: 2px solid #3b82f6;
  outline-offset: 2px;
}

/* Animation for question transitions */
.quiz-question-enter {
  opacity: 0;
  transform: translateX(20px);
}

.quiz-question-enter-active {
  opacity: 1;
  transform: translateX(0);
  transition: opacity 0.3s ease, transform 0.3s ease;
}