/* ==========================================================================
   Quiz UI
   MCQ, Fill-in-the-Blank, and Matching question types
   ========================================================================== */

/* ==========================================================================
   Container & Header
   ========================================================================== */

.quiz-container {
  margin: 24px 0;
  padding: 20px;
  border-radius: 12px;
  border-left: 4px solid var(--accent, #61dafb);
  background: var(--bg-card, #22223b);
  transition: var(--transition-colors, background-color 0.3s ease);
}

.quiz-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.quiz-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--accent-muted, rgba(97, 218, 251, 0.15));
  color: var(--accent, #61dafb);
}

.quiz-question {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary, #e0e0e0);
  margin-bottom: 16px;
  line-height: 1.5;
}

/* ==========================================================================
   Multiple Choice Options
   ========================================================================== */

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

.quiz-option {
  padding: 12px 16px;
  margin: 4px 0;
  border-radius: 8px;
  border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
  background: transparent;
  color: var(--text-primary, #e0e0e0);
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  line-height: 1.5;
}

.quiz-option:hover {
  background: var(--bg-hover, rgba(255, 255, 255, 0.06));
  border-color: var(--border-color-strong, rgba(255, 255, 255, 0.2));
}

.quiz-option:active {
  transform: scale(0.99);
}

.quiz-option.selected {
  border-color: var(--accent, #61dafb);
  background: var(--accent-muted, rgba(97, 218, 251, 0.15));
}

.quiz-option.correct {
  border-color: var(--success, #4ecdc4);
  background: var(--success-bg, rgba(78, 205, 196, 0.15));
}

.quiz-option.correct::before {
  content: '\2713';
  color: var(--success, #4ecdc4);
  font-weight: 700;
  flex-shrink: 0;
}

.quiz-option.incorrect {
  border-color: var(--error, #e94560);
  background: var(--error-bg, rgba(233, 69, 96, 0.15));
}

.quiz-option.incorrect::before {
  content: '\2717';
  color: var(--error, #e94560);
  font-weight: 700;
  flex-shrink: 0;
}

/* Disabled state after answering */
.quiz-option.disabled {
  pointer-events: none;
  opacity: 0.65;
}

.quiz-option.disabled.correct,
.quiz-option.disabled.incorrect {
  opacity: 1;
}

/* Option letter label */
.quiz-option-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--border-color-strong, rgba(255, 255, 255, 0.2));
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.quiz-option.selected .quiz-option-label {
  background: var(--accent, #61dafb);
  color: var(--text-inverse, #1a1a2e);
  border-color: var(--accent, #61dafb);
}

/* ==========================================================================
   Explanation
   ========================================================================== */

.quiz-explanation {
  margin-top: 12px;
  padding: 12px;
  border-radius: 8px;
  background: var(--bg-tertiary, #2d3748);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary, #a0aec0);
  display: none;
}

.quiz-explanation.visible {
  display: block;
}

.quiz-explanation strong {
  color: var(--text-primary, #e0e0e0);
}

.quiz-explanation code {
  background: var(--bg-code, #1e1e2e);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: var(--font-mono, monospace);
  font-size: 12px;
}

/* ==========================================================================
   Submit Button & Score
   ========================================================================== */

.quiz-submit-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  padding: 10px 20px;
  border-radius: 6px;
  border: none;
  background: var(--accent, #61dafb);
  color: var(--text-inverse, #1a1a2e);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.15s ease;
  -webkit-appearance: none;
  appearance: none;
}

.quiz-submit-btn:hover {
  background: var(--accent-hover, #79e3ff);
  transform: scale(1.03);
}

.quiz-submit-btn:active {
  transform: scale(0.97);
}

.quiz-submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.quiz-submit-btn:focus-visible {
  outline: 2px solid var(--accent, #61dafb);
  outline-offset: 2px;
}

.quiz-score {
  font-size: 14px;
  color: var(--text-secondary, #a0aec0);
  margin-top: 8px;
}

.quiz-score strong {
  color: var(--accent, #61dafb);
}

/* ==========================================================================
   Fill-in-the-Blank
   ========================================================================== */

.quiz-fill-input {
  display: inline-block;
  min-width: 100px;
  padding: 2px 4px;
  border: none;
  border-bottom: 2px dashed var(--accent, #61dafb);
  background: transparent;
  color: var(--text-primary, #e0e0e0);
  font-family: var(--font-mono, monospace);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s ease;
}

.quiz-fill-input::placeholder {
  color: var(--text-muted, #718096);
  font-style: italic;
}

.quiz-fill-input:focus {
  border-bottom-style: solid;
  border-bottom-color: var(--accent-hover, #79e3ff);
}

.quiz-fill-input.correct {
  border-bottom-color: var(--success, #4ecdc4);
  color: var(--success, #4ecdc4);
}

.quiz-fill-input.incorrect {
  border-bottom-color: var(--error, #e94560);
  color: var(--error, #e94560);
}

/* ==========================================================================
   Matching
   ========================================================================== */

.quiz-match-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 8px;
}

.quiz-match-column-header {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted, #718096);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
  margin-bottom: 4px;
}

.quiz-match-item {
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
  background: var(--bg-tertiary, #2d3748);
  color: var(--text-primary, #e0e0e0);
  font-size: 13px;
  cursor: grab;
  user-select: none;
  transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  margin-bottom: 6px;
}

.quiz-match-item:hover {
  border-color: var(--accent, #61dafb);
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(0, 0, 0, 0.3));
}

.quiz-match-item:active {
  cursor: grabbing;
}

.quiz-match-item.dragging {
  opacity: 0.6;
  box-shadow: var(--shadow-md, 0 4px 12px rgba(0, 0, 0, 0.4));
}

.quiz-match-item.matched {
  border-color: var(--success, #4ecdc4);
  background: var(--success-bg, rgba(78, 205, 196, 0.15));
}

.quiz-match-item.wrong {
  border-color: var(--error, #e94560);
  background: var(--error-bg, rgba(233, 69, 96, 0.15));
}

/* Drop zone highlight */
.quiz-match-drop-zone {
  border: 2px dashed var(--border-color, rgba(255, 255, 255, 0.1));
  border-radius: 6px;
  padding: 8px 12px;
  min-height: 38px;
  margin-bottom: 6px;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.quiz-match-drop-zone.drag-over {
  border-color: var(--accent, #61dafb);
  background: var(--accent-muted, rgba(97, 218, 251, 0.15));
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 768px) {
  .quiz-container {
    padding: 16px;
    margin: 16px 0;
  }

  .quiz-question {
    font-size: 15px;
  }

  .quiz-option {
    padding: 10px 12px;
  }

  .quiz-match-container {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}