/* ===== QUIZ PAGE ===== */
.quiz-page {
  min-height: calc(100vh - 200px);
  padding: 2rem 0 4rem;
}

.quiz-screen {
  display: none;
  animation: fadeIn 0.3s ease;
}

.quiz-screen.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== START SCREEN ===== */
.quiz-header-card {
  max-width: 600px;
  margin: 0 auto 3rem;
  text-align: center;
}

.quiz-icon {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
}

.quiz-icon i {
  font-size: 3rem;
  color: white;
}

.quiz-header-card h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.quiz-header-card p {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

.difficulty-selector {
  max-width: 800px;
  margin: 0 auto 3rem;
}

.difficulty-selector h2 {
  text-align: center;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2rem;
}

.difficulty-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.difficulty-btn {
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.difficulty-btn:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

.difficulty-btn[data-difficulty="easy"]:hover {
  border-color: var(--success);
}

.difficulty-btn[data-difficulty="medium"]:hover {
  border-color: var(--warning);
}

.difficulty-btn[data-difficulty="hard"]:hover {
  border-color: var(--danger);
}

.difficulty-btn i {
  font-size: 2.5rem;
  color: var(--text-secondary);
}

.difficulty-btn[data-difficulty="easy"] i {
  color: var(--success);
}

.difficulty-btn[data-difficulty="medium"] i {
  color: var(--warning);
}

.difficulty-btn[data-difficulty="hard"] i {
  color: var(--danger);
}

.difficulty-btn span {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.difficulty-btn small {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.quiz-stats-preview {
  max-width: 600px;
  margin: 0 auto;
  display: flex;
  justify-content: center;
  gap: 2rem;
  padding: 2rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.stat-preview {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.stat-preview i {
  font-size: 1.5rem;
  color: var(--primary);
}

.stat-preview span {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* ===== QUIZ SCREEN ===== */
.quiz-progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 2rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  width: 0%;
  transition: width 0.3s ease;
}

.quiz-info-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding: 1rem 1.5rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.quiz-counter,
.quiz-score {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.quiz-counter span,
.quiz-score span {
  color: var(--primary);
}

.question-card {
  max-width: 800px;
  margin: 0 auto 2rem;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
}

.question-card h2 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.answers-grid {
  display: grid;
  gap: 1rem;
}

.answer-btn {
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  text-align: left;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.answer-btn:hover:not(:disabled) {
  background: var(--bg-tertiary);
  border-color: var(--primary);
  transform: translateX(4px);
}

.answer-btn:disabled {
  cursor: not-allowed;
}

.answer-btn.selected {
  background: var(--primary);
  border-color: var(--primary);
  color: white;
}

.answer-btn.correct {
  background: var(--success);
  border-color: var(--success);
  color: white;
  animation: correctAnswer 0.5s ease;
}

.answer-btn.wrong {
  background: var(--danger);
  border-color: var(--danger);
  color: white;
  animation: wrongAnswer 0.5s ease;
}

@keyframes correctAnswer {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

@keyframes wrongAnswer {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-10px); }
  75% { transform: translateX(10px); }
}

.quiz-actions {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

/* ===== RESULTS SCREEN ===== */
.results-card {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 3rem 2rem;
  box-shadow: var(--shadow-lg);
}

.results-icon {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--success), #059669);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  animation: scaleIn 0.5s ease;
}

@keyframes scaleIn {
  from {
    transform: scale(0);
  }
  to {
    transform: scale(1);
  }
}

.results-icon i {
  font-size: 3rem;
  color: white;
}

.results-card h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2rem;
}

.final-score {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 3rem;
  padding: 2rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.score-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.score-value {
  font-size: 4rem;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
}

.score-total {
  font-size: 1rem;
  color: var(--text-secondary);
}

.results-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.result-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

.result-stat i {
  font-size: 1.75rem;
}

.result-stat:nth-child(1) i {
  color: var(--success);
}

.result-stat:nth-child(2) i {
  color: var(--danger);
}

.result-stat:nth-child(3) i {
  color: var(--primary);
}

.result-stat .stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

.result-stat .stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.results-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .quiz-header-card h1 {
    font-size: 2rem;
  }
  
  .difficulty-grid {
    grid-template-columns: 1fr;
  }
  
  .quiz-stats-preview {
    flex-direction: column;
    gap: 1rem;
  }
  
  .question-card {
    padding: 1.5rem;
  }
  
  .question-card h2 {
    font-size: 1.25rem;
  }
  
  .quiz-actions {
    flex-direction: column;
  }
  
  .results-stats {
    grid-template-columns: 1fr;
  }
  
  .results-actions {
    flex-direction: column;
  }
  
  .score-value {
    font-size: 3rem;
  }
}

/* ===== DARK MODE ===== */
body.dark-mode .difficulty-btn,
body.dark-mode .question-card,
body.dark-mode .quiz-info-bar,
body.dark-mode .results-card {
  background: var(--bg-primary);
  border-color: var(--border-color);
}

body.dark-mode .answer-btn {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
}

body.dark-mode .answer-btn:hover:not(:disabled) {
  background: var(--bg-secondary);
}