/* ============================================
   Quiz Engine Styles
   ============================================ */

/* ---- Section container ---- */
.qe-section {
  margin-top: 2rem;
  border-top: 1px solid var(--border-default);
  padding-top: 1.5rem;
}

.qe-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.qe-header h2 {
  margin: 0;
  font-size: 1.4rem;
}

.qe-progress {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  background: var(--bg-tertiary);
  padding: 4px 12px;
  border-radius: 12px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.qe-progress.qe-all-done {
  background: var(--accent-green);
  color: var(--bg-primary);
}

/* ---- Individual question ---- */
.qe-question {
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md, 8px);
  padding: 1.25rem;
  margin-bottom: 1rem;
  transition: border-color 0.3s ease;
}

.qe-question.qe-correct {
  border-color: var(--accent-green);
}

.qe-q-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.qe-q-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
  font-family: var(--font-mono);
}

.qe-correct .qe-q-num {
  background: var(--accent-green);
  color: var(--bg-primary);
}

.qe-q-status {
  font-size: 1.1rem;
  color: var(--accent-green);
  font-weight: 700;
}

.qe-q-text {
  margin: 0 0 1rem 0;
  line-height: 1.6;
  color: var(--text-primary);
}

/* ---- MC / TF options ---- */
.qe-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.qe-options.qe-tf {
  flex-direction: row;
  gap: 0.75rem;
}

.qe-opt {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md, 8px);
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: left;
  width: 100%;
  font-family: inherit;
  line-height: 1.4;
}

.qe-options.qe-tf .qe-opt {
  flex: 1;
  justify-content: center;
}

.qe-opt:hover:not(.qe-correct-opt):not(.qe-wrong):not(:disabled) {
  border-color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.08);
}

.qe-opt.qe-selected {
  border-color: var(--accent-blue);
  background: rgba(88, 166, 255, 0.12);
}

.qe-opt.qe-correct-opt {
  border-color: var(--accent-green);
  background: rgba(63, 185, 80, 0.12);
  cursor: default;
}

.qe-opt.qe-wrong {
  border-color: var(--accent-red);
  background: rgba(248, 81, 73, 0.12);
  animation: qe-shake 0.4s ease;
}

.qe-opt-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--bg-primary);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
  flex-shrink: 0;
  color: var(--text-secondary);
}

.qe-correct-opt .qe-opt-letter {
  background: var(--accent-green);
  color: var(--bg-primary);
}

.qe-opt-text {
  flex: 1;
}

/* ---- Fill-in-the-blank ---- */
.qe-fill {
  display: flex;
  gap: 0.5rem;
}

.qe-fill-input,
.qe-flag-input {
  flex: 1;
  padding: 0.6rem 0.8rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md, 8px);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.2s ease;
}

.qe-fill-input:focus,
.qe-flag-input:focus {
  border-color: var(--accent-blue);
}

.qe-fill-input.qe-input-correct,
.qe-flag-input.qe-input-correct {
  border-color: var(--accent-green);
  background: rgba(63, 185, 80, 0.08);
}

.qe-fill-input.qe-input-wrong,
.qe-flag-input.qe-input-wrong {
  border-color: var(--accent-red);
  animation: qe-shake 0.4s ease;
}

.qe-fill-btn,
.qe-flag-btn,
.qe-order-check {
  padding: 0.6rem 1.2rem;
  background: var(--accent-blue);
  color: var(--bg-primary);
  border: none;
  border-radius: var(--radius-md, 8px);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: opacity 0.2s;
  white-space: nowrap;
}

.qe-fill-btn:hover,
.qe-flag-btn:hover,
.qe-order-check:hover {
  opacity: 0.85;
}

.qe-fill-btn:disabled,
.qe-flag-btn:disabled,
.qe-order-check:disabled {
  opacity: 0.5;
  cursor: default;
}

/* ---- Ordering ---- */
.qe-order {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.qe-order-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md, 8px);
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: grab;
  user-select: none;
  transition: all 0.15s ease;
}

.qe-order-item:active {
  cursor: grabbing;
}

.qe-order-item.qe-dragging {
  opacity: 0.5;
  border-color: var(--accent-blue);
}

.qe-drag-handle {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.qe-order.qe-order-correct .qe-order-item {
  border-color: var(--accent-green);
  cursor: default;
}

.qe-order.qe-order-wrong {
  animation: qe-shake 0.4s ease;
}

/* ---- Feedback ---- */
.qe-feedback,
.qe-flag-feedback {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  min-height: 1.2em;
}

.qe-correct-text {
  color: var(--accent-green);
  font-weight: 600;
}

.qe-wrong-text {
  color: var(--accent-red);
  font-weight: 600;
}

.qe-hint {
  color: var(--text-muted);
  font-style: italic;
}

/* ---- Flags section ---- */
.qe-flags-section {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--border-default);
}

.qe-flags-title {
  margin: 0 0 0.25rem 0;
  font-size: 1.1rem;
  color: var(--accent-green);
}

.qe-flags-desc {
  margin: 0 0 1rem 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.qe-flag {
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md, 8px);
  padding: 1rem;
  margin-bottom: 0.75rem;
  transition: border-color 0.3s ease;
}

.qe-flag.qe-flag-done {
  border-color: var(--accent-green);
}

.qe-flag-label {
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.qe-flag-input-row {
  display: flex;
  gap: 0.5rem;
}

.qe-flag-btn {
  background: var(--accent-green);
}

/* ---- Result banner ---- */
.qe-result {
  margin-top: 1rem;
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.4s ease;
}

.qe-result.qe-visible {
  max-height: 100px;
}

.qe-complete {
  background: rgba(63, 185, 80, 0.12);
  border: 1px solid var(--accent-green);
  border-radius: var(--radius-md, 8px);
  padding: 1rem;
  text-align: center;
  color: var(--accent-green);
  font-weight: 700;
  font-size: 1rem;
}

/* ---- Shake animation ---- */
@keyframes qe-shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

/* ---- Mobile responsive ---- */
@media (max-width: 768px) {
  .qe-options.qe-tf {
    flex-direction: column;
  }
  .qe-fill,
  .qe-flag-input-row {
    flex-direction: column;
  }
  .qe-fill-btn,
  .qe-flag-btn {
    width: 100%;
  }
  .qe-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}