/* ===== QUIZ TAB ===== */
.quiz-container {
  max-width: 700px;
  margin: 0 auto;
}

/* Ready State */
.quiz-ready {
  text-align: center;
  padding: 40px 0;
}

.quiz-ready h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  margin-bottom: 8px;
}

.quiz-info {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 32px;
}

.quiz-settings {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px;
  text-align: left;
  margin-bottom: 28px;
}

.quiz-setting {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
}

.quiz-setting:not(:last-child) {
  border-bottom: 1px solid var(--border);
}

.quiz-setting-label {
  font-size: 0.92rem;
  font-weight: 500;
}

.quiz-setting-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Toggle Switch */
.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  background: var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: background var(--transition);
}

.toggle.active { background: var(--primary); }

.toggle::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  background: #fff;
  border-radius: 50%;
  top: 3px;
  left: 3px;
  transition: transform var(--transition);
}

.toggle.active::after { transform: translateX(20px); }

/* Timer Options */
.timer-options {
  display: flex;
  gap: 4px;
  background: var(--surface);
  border-radius: 50px;
  padding: 3px;
}

.timer-option {
  padding: 5px 12px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition);
}

.timer-option:hover { color: var(--text); }
.timer-option.active { background: var(--primary); color: #fff; }

.start-quiz-btn {
  padding: 14px 36px;
  background: linear-gradient(135deg, var(--primary), #6d28d9);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.start-quiz-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--primary-glow);
}

/* ===== In Progress ===== */
.quiz-progress-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-bottom: 24px;
  overflow: hidden;
}

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

.quiz-question-number {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.quiz-timer {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--highlight);
  font-weight: 600;
  font-family: var(--font-mono);
  float: right;
}

.quiz-timer.warning { color: var(--wrong); animation: pulse 0.5s ease infinite alternate; }
@keyframes pulse { to { opacity: 0.5; } }

.quiz-question-text {
  font-family: var(--font-content);
  font-size: 1.15rem;
  line-height: 1.6;
  margin-bottom: 24px;
  font-weight: 500;
}

/* Options */
.quiz-options { display: flex; flex-direction: column; gap: 10px; }

.quiz-option {
  width: 100%;
  text-align: left;
  padding: 14px 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-content);
  font-size: 0.95rem;
  line-height: 1.5;
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
}

.quiz-option:hover:not(.disabled) {
  border-color: var(--primary);
  background: rgba(124,58,237,0.05);
}

.quiz-option.selected { border-color: var(--primary); background: rgba(124,58,237,0.1); }

.quiz-option.correct {
  border-color: var(--correct);
  background: rgba(34,197,94,0.1);
  animation: correctPulse 0.4s ease;
}

.quiz-option.wrong {
  border-color: var(--wrong);
  background: rgba(239,68,68,0.1);
  animation: wrongShake 0.4s ease;
}

.quiz-option.disabled { cursor: default; opacity: 0.8; }

.quiz-option .option-indicator {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
}

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

@keyframes wrongShake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

/* Explanation */
.quiz-explanation {
  margin-top: 16px;
  padding: 14px 18px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--secondary);
  font-family: var(--font-content);
  font-size: 0.9rem;
  line-height: 1.6;
  animation: fadeSlideUp 0.3s ease;
}

.quiz-next-btn {
  margin-top: 20px;
  padding: 12px 28px;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.quiz-next-btn:hover { background: var(--primary-hover); }

/* ===== Results ===== */
.quiz-results {
  text-align: center;
  animation: fadeSlideUp 0.5s ease;
}

.quiz-score-circle {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: var(--card);
  border: 4px solid var(--primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 12px;
}

.quiz-score-value {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
}

.quiz-score-percent {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.quiz-grade {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  margin: 12px 0;
}

.quiz-grade.grade-a { color: var(--correct); }
.quiz-grade.grade-b { color: #22d3ee; }
.quiz-grade.grade-c { color: var(--highlight); }
.quiz-grade.grade-d { color: #f97316; }
.quiz-grade.grade-f { color: var(--wrong); }

.quiz-result-stats {
  display: flex;
  justify-content: center;
  gap: 28px;
  margin: 20px 0 28px;
  flex-wrap: wrap;
}

.quiz-result-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.quiz-result-stat-value {
  font-size: 1.2rem;
  font-weight: 700;
}

.quiz-result-stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.quiz-result-actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Review */
.quiz-review {
  text-align: left;
  margin-top: 32px;
}

.quiz-review-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.quiz-review-header h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
}

.review-question {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

.review-question-text {
  font-family: var(--font-content);
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 12px;
}

.review-answer {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 6px;
}

.review-answer.your-correct {
  background: rgba(34,197,94,0.1);
  border-left: 3px solid var(--correct);
}

.review-answer.your-wrong {
  background: rgba(239,68,68,0.1);
  border-left: 3px solid var(--wrong);
}

.review-answer.correct-answer {
  background: rgba(34,197,94,0.08);
  border-left: 3px solid var(--correct);
}

.review-explanation {
  margin-top: 8px;
  padding: 10px 14px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ===== Open-Ended Questions ===== */
.oe-badge {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(6, 182, 212, 0.12);
  color: var(--secondary);
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.oe-badge-sm {
  display: inline-block;
  padding: 2px 8px;
  background: rgba(6, 182, 212, 0.12);
  color: var(--secondary);
  border-radius: 50px;
  font-size: 0.7rem;
  font-weight: 600;
  vertical-align: middle;
  margin-left: 6px;
}

.open-ended-area {
  display: flex;
  flex-direction: column;
}

.oe-textarea {
  width: 100%;
  min-height: 120px;
  resize: vertical;
  font-family: var(--font-content);
  font-size: 0.95rem;
  line-height: 1.6;
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  margin-bottom: 12px;
  transition: border-color var(--transition);
}

.oe-textarea:focus { border-color: var(--primary); outline: none; }
.oe-textarea:disabled { opacity: 0.6; cursor: not-allowed; }

.oe-submit-btn { align-self: flex-start; }

/* Grading Loader */
.oe-grading-loader {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.oe-grading-loader .spinner {
  width: 20px;
  height: 20px;
  animation: spin 1s linear infinite;
}

/* Grade Result */
.oe-grade-result {
  margin-top: 16px;
  padding: 18px;
  background: var(--card);
  border-radius: var(--radius);
  border-left: 3px solid var(--secondary);
}

.oe-score {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.oe-feedback {
  font-family: var(--font-content);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-bottom: 12px;
}

.oe-missed {
  margin-bottom: 12px;
}

.oe-missed-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.oe-missed-point {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  border-radius: 50px;
  font-size: 0.8rem;
  color: var(--wrong);
  margin: 2px 4px 2px 0;
}

.oe-correct-answer {
  padding: 12px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--correct);
}

.oe-correct-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.oe-correct-answer p {
  font-family: var(--font-content);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

/* Review score for open-ended */
.oe-review-score {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  padding: 4px 0 8px;
}

/* Results breakdown */
.quiz-breakdown {
  font-family: var(--font-content);
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}

@media (max-width: 480px) {
  .quiz-question-text { font-size: 1rem; }
  .quiz-score-circle { width: 130px; height: 130px; }
  .quiz-score-value { font-size: 1.8rem; }
  .quiz-grade { font-size: 2.4rem; }
  .oe-textarea { min-height: 100px; }
}