/* ============================================================
   Interactive Quiz Cards
   ============================================================ */

.quiz-card {
  border: 1px solid var(--line);
  padding: var(--space-6);
  margin: var(--space-6) 0;
  position: relative;
}
.quiz-card + .quiz-card {
  margin-top: var(--space-5);
}

.quiz-question {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
  line-height: var(--leading-normal);
  margin-bottom: var(--space-5);
}
.quiz-num {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: var(--weight-semibold);
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-right: var(--space-3);
  padding: 2px 6px;
  border: 1px solid var(--line);
  border-radius: 2px;
  vertical-align: middle;
}

/* Options */
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}
.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
  user-select: none;
}
.quiz-option:hover {
  border-color: var(--line-2);
  background: var(--bg-hover, rgba(0,0,0,0.02));
}

/* Radio indicator */
.quiz-radio {
  display: inline-block;
  width: 14px;
  height: 14px;
  min-width: 14px;
  border: 1.5px solid var(--muted);
  border-radius: 50%;
  margin-top: 3px;
  position: relative;
  transition: border-color 0.15s ease;
}
.quiz-option.selected .quiz-radio {
  border-color: var(--ink);
}
.quiz-option.selected .quiz-radio::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink);
}

.quiz-option-text {
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--ink-soft);
}

/* Check button */
.quiz-check {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: var(--space-2) var(--space-5);
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.quiz-check:hover {
  background: var(--ink);
  color: var(--bg);
}
.quiz-check:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.quiz-check:disabled:hover {
  background: transparent;
  color: var(--ink);
}

/* Answered states */
.quiz-option.correct {
  border-color: #2d8a4e;
  background: rgba(45, 138, 78, 0.06);
}
.quiz-option.correct .quiz-radio {
  border-color: #2d8a4e;
}
.quiz-option.correct .quiz-radio::after {
  background: #2d8a4e;
}
.quiz-option.correct .quiz-option-text {
  color: #2d8a4e;
}
.quiz-option.correct::after {
  content: '✓';
  margin-left: auto;
  font-weight: var(--weight-semibold);
  color: #2d8a4e;
  font-size: var(--text-sm);
}

.quiz-option.wrong {
  border-color: #c93c37;
  background: rgba(201, 60, 55, 0.06);
}
.quiz-option.wrong .quiz-radio {
  border-color: #c93c37;
}
.quiz-option.wrong .quiz-radio::after {
  background: #c93c37;
}
.quiz-option.wrong .quiz-option-text {
  color: #c93c37;
  text-decoration: line-through;
}
.quiz-option.wrong::after {
  content: '✗';
  margin-left: auto;
  font-weight: var(--weight-semibold);
  color: #c93c37;
  font-size: var(--text-sm);
}

/* Explanation */
.quiz-explanation {
  margin-top: var(--space-4);
  padding: var(--space-4) var(--space-5);
  border-left: 2px solid var(--line-2);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--ink-soft);
  animation: quizFadeIn 0.25s ease;
}
.quiz-explanation[hidden] {
  display: none;
}

@keyframes quizFadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Locked state after answering */
.quiz-card.answered .quiz-option {
  cursor: default;
  pointer-events: none;
}
.quiz-card.answered .quiz-check {
  display: none;
}

/* Dark mode adjustments */
[data-theme="dark"] .quiz-option:hover {
  background: rgba(255,255,255,0.03);
}
[data-theme="dark"] .quiz-option.correct {
  background: rgba(45, 138, 78, 0.1);
}
[data-theme="dark"] .quiz-option.wrong {
  background: rgba(201, 60, 55, 0.1);
}