/* ============================================================
 * BioQuest — 练习模式样式
 * ============================================================ */

/* ============================================================
 * 错题专项练习入口
 * ============================================================ */

.wrong-practice-entry {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  margin-bottom: 14px;
  background: linear-gradient(135deg, var(--state-error-bg), rgba(192, 85, 58, 0.03));
  border: 1px solid rgba(192, 85, 58, 0.2);
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.88rem;
  color: var(--text-primary, #e0e8e4);
  transition: all 0.2s ease;
}

.wrong-practice-entry:hover {
  background: linear-gradient(135deg, rgba(192, 85, 58, 0.12), rgba(192, 85, 58, 0.06));
  border-color: rgba(192, 85, 58, 0.35);
}

.wrong-practice-icon {
  color: var(--state-error, #c0553a);
  font-weight: 700;
  font-size: 1rem;
}

.wrong-practice-count {
  margin-left: auto;
  padding: 2px 10px;
  background: rgba(192, 85, 58, 0.12);
  color: var(--state-error, #c0553a);
  border-radius: 10px;
  font-size: 0.78rem;
  font-weight: 600;
}

/* ============================================================
 * 重做进度条
 * ============================================================ */

.redo-progress {
  text-align: center;
  padding: 8px 0;
  font-size: 0.85rem;
  color: #ef4444;
  font-weight: 600;
  margin-bottom: 8px;
}

.redo-progress strong {
  font-size: 1rem;
}

.practice-filter-panel {
  background-color: var(--surface-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
}

.practice-filter-section {
  margin-bottom: 28px;
}

.practice-filter-section:last-of-type {
  margin-bottom: 0;
}

.practice-filter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.practice-filter-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 12px;
}

.practice-filter-header .practice-filter-title {
  margin-bottom: 0;
}

.practice-filter-checks {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.practice-filter-check {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background-color: var(--surface-secondary);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
  user-select: none;
}

.practice-filter-check:hover {
  border-color: var(--border-default);
}

.practice-filter-check:has(input:checked) {
  border-color: var(--color-amber);
  background-color: rgba(196, 149, 106, 0.08);
}

.practice-filter-check input[type="checkbox"] {
  accent-color: var(--color-amber);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.practice-select {
  width: 100%;
  max-width: 240px;
  padding: 10px 14px;
  font-size: 0.938rem;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--surface-primary);
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition-fast);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238a8a8a' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

.practice-select:focus-visible {
  border-color: var(--color-amber);
  outline: none;
  box-shadow: 0 0 0 3px rgba(196, 149, 106, 0.2);
}

.practice-filter-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
  flex-wrap: wrap;
}

/* ============================================================
 * Pull Questions
 * ============================================================ */
.practice-pull-section {
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px dashed var(--border-light);
}

.practice-pull-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.practice-pull-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.practice-pull-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.practice-pull-select {
  min-width: 140px;
  max-width: 200px;
}

.practice-pull-status {
  margin-top: 12px;
  font-size: 0.85rem;
  min-height: 1.4em;
  color: var(--text-secondary);
}

.practice-pull-status--success {
  color: var(--color-sage, #5a7d5c);
}

.practice-pull-status--error {
  color: var(--terracotta, #c0553a);
}

.practice-pull-status--info {
  color: var(--text-secondary);
}

.practice-pull-btn-cooldown {
  opacity: 0.7;
  cursor: not-allowed;
}

.practice-pull-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.practice-pull-summary span {
  padding: 3px 10px;
  background: var(--surface-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
}

@media (max-width: 640px) {
  .practice-pull-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .practice-pull-select {
    max-width: none;
  }
}

/* ============================================================
 * Quiz Interface
 * ============================================================ */

.practice-quiz-header {
  margin-bottom: 24px;
}

.practice-progress {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.practice-progress-count {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-sage);
  white-space: nowrap;
}

.practice-progress-bar {
  flex: 1;
  height: 6px;
  background-color: var(--surface-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.practice-progress-fill {
  height: 100%;
  background-color: var(--color-sage);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

.practice-quiz-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.practice-question-card {
  background-color: var(--surface-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.practice-question-text {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-deep);
  line-height: 1.8;
  margin-bottom: 24px;
  word-break: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
}

.practice-question-chart {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  padding: 12px;
  background: rgba(0, 0, 0, 0.02);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
}

.practice-question-chart img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
}

[data-theme="dark"] .practice-question-chart {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-default);
}

[data-theme="dark"] .practice-question-chart img {
  background: #fff;
}

.practice-options-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.practice-option-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 16px 18px;
  background-color: var(--surface-secondary);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.practice-option-card:hover {
  border-color: var(--border-default);
}

.practice-option-selected {
  border-color: var(--color-amber);
  background-color: rgba(196, 149, 106, 0.06);
}

.practice-option-correct {
  border-color: var(--color-success);
  background-color: rgba(58, 140, 92, 0.08);
}

.practice-option-wrong {
  border-color: var(--color-error);
  background-color: rgba(192, 85, 58, 0.06);
}

.practice-option-label {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--color-deep);
  color: var(--text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.practice-option-correct .practice-option-label {
  background-color: var(--color-success);
}

.practice-option-wrong .practice-option-label {
  background-color: var(--color-error);
}

.practice-option-text {
  font-size: 0.938rem;
  color: var(--text-primary);
  line-height: 1.65;
  flex: 1;
}

.practice-option-toggle {
  display: flex;
  gap: 8px;
}

.practice-tf-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-sm);
  background-color: var(--surface-primary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.practice-tf-btn:hover:not(:disabled) {
  border-color: var(--color-amber);
  color: var(--color-amber);
}

.practice-tf-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.practice-tf-active.practice-tf-true {
  background-color: rgba(58, 140, 92, 0.12);
  border-color: var(--color-success);
  color: var(--color-success);
}

.practice-tf-active.practice-tf-false {
  background-color: rgba(192, 85, 58, 0.12);
  border-color: var(--color-error);
  color: var(--color-error);
}

.practice-option-result {
  font-size: 0.8rem;
  font-weight: 500;
  padding-top: 4px;
}

/* ============================================================
 * Score Display
 * ============================================================ */

.practice-score-display {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 14px 18px;
  background-color: var(--surface-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
}

.practice-score-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.practice-score-value {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-amber);
}

.practice-score-detail {
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

.practice-explanation {
  margin-top: 16px;
  padding: 18px 20px;
  background-color: var(--surface-tertiary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-sage);
}

.practice-explanation-title {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 8px;
}

.practice-explanation-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================================
 * Action Buttons
 * ============================================================ */

.practice-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.practice-actions-left {
  display: flex;
  gap: 8px;
}

.practice-actions-right {
  display: flex;
  gap: 8px;
}

.practice-fav-btn,
.practice-wrong-btn {
  background-color: var(--surface-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.practice-fav-btn:hover,
.practice-wrong-btn:hover {
  border-color: var(--border-default);
  background-color: var(--surface-tertiary);
}

.practice-fav-active {
  color: var(--color-warning);
  border-color: var(--color-warning);
  background-color: rgba(232, 168, 48, 0.08);
}

.practice-wrong-active {
  color: var(--color-error);
  border-color: var(--color-error);
  background-color: rgba(192, 85, 58, 0.08);
}

/* ============================================================
 * Cumulative Stats
 * ============================================================ */

.practice-cumulative {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 20px;
  padding: 12px 18px;
  background-color: var(--surface-secondary);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.practice-cumulative strong {
  color: var(--text-primary);
  font-family: var(--font-mono);
}

/* ============================================================
 * Summary Page
 * ============================================================ */

.practice-summary-card {
  background-color: var(--surface-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-md);
}

.practice-summary-overview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 20px;
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
}

.practice-summary-stat-item {
  text-align: center;
}

.practice-summary-stat-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-amber);
  line-height: 1.2;
}

.practice-summary-stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.practice-summary-detail {
  margin-bottom: 28px;
}

.practice-summary-detail-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-deep);
  margin-bottom: 16px;
}

.practice-summary-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background-color: var(--surface-secondary);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  gap: 12px;
  flex-wrap: wrap;
}

.practice-summary-module {
  font-weight: 600;
  color: var(--text-primary);
  min-width: 80px;
}

.practice-summary-stat {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.practice-summary-actions {
  display: flex;
  gap: 12px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
  flex-wrap: wrap;
}

/* ============================================================
 * Loading Bar
 * ============================================================ */

/* ============================================================
 * Loading Screen
 * ============================================================ */

.practice-loading-screen,
.exam-loading-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 40px 24px;
}

.practice-loading-content,
.exam-loading-content {
  text-align: center;
  max-width: 420px;
  width: 100%;
}

.practice-loading-icon,
.exam-loading-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  animation: pulse 2s ease-in-out infinite;
}

.practice-loading-title,
.exam-loading-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-deep);
  margin: 0 0 8px;
}

.practice-loading-status,
.exam-loading-status {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0 0 16px;
  min-height: 1.3em;
}

.practice-loading-bar-wrap,
.exam-loading-bar-wrap {
  width: 100%;
  height: 8px;
  background: var(--surface-tertiary, rgba(0,0,0,0.06));
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 12px;
}

.practice-loading-bar,
.exam-loading-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-sage), var(--color-amber));
  border-radius: 99px;
  transition: width 0.4s ease;
  width: 0%;
}

.practice-loading-hint,
.exam-loading-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
}

.practice-loading-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(255, 255, 255, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(2px);
}

.practice-loading-bar-legacy {
  width: 60%;
  max-width: 360px;
  height: 6px;
  background-color: var(--surface-tertiary, #e0e0e0);
  border-radius: 99px;
  overflow: hidden;
}

.practice-loading-fill {
  height: 100%;
  background-color: var(--color-amber);
  border-radius: 99px;
  animation: practice-loading-pulse 1.4s ease-in-out infinite;
}

@keyframes practice-loading-pulse {
  0% { width: 0%; }
  50% { width: 70%; }
  100% { width: 100%; }
}

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

@media (max-width: 768px) {
  .practice-filter-panel {
    padding: 20px;
  }

  .practice-filter-checks {
    flex-direction: column;
    gap: 8px;
  }

  .practice-filter-check {
    padding: 10px 14px;
    font-size: 0.85rem;
  }

  .practice-question-card {
    padding: 20px 16px;
  }

  .practice-question-text {
    font-size: 1rem;
  }

  .practice-option-card {
    padding: 14px;
  }

  .practice-option-text {
    font-size: 0.875rem;
  }

  .practice-option-toggle {
    flex-wrap: wrap;
  }

  .practice-tf-btn {
    flex: 1;
    justify-content: center;
    min-width: 80px;
  }

  .practice-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .practice-actions-left,
  .practice-actions-right {
    justify-content: center;
  }

  .practice-actions-right .btn {
    width: 100%;
  }

  .practice-cumulative {
    justify-content: center;
    gap: 16px;
  }

  .practice-summary-card {
    padding: 20px;
  }

  .practice-summary-overview {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .practice-summary-stat-num {
    font-size: 1.5rem;
  }

  .practice-select {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  .practice-filter-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .practice-summary-overview {
    grid-template-columns: 1fr 1fr;
  }

  .practice-summary-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}

/* ============================================================
 * Exam UI Fixes — 文字拥挤 & 响应式
 * ============================================================ */

.exam-q-stem {
  word-break: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
  line-height: 1.8;
}

.exam-subq-text {
  word-break: break-word;
  overflow-wrap: break-word;
  line-height: 1.6;
  min-width: 0;
}

.exam-subq-label {
  flex-shrink: 0;
}

.exam-subq {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
}

.exam-subq-toggle {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.exam-toggle-btn {
  padding: 6px 14px;
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: all 0.15s;
  white-space: nowrap;
}

.exam-toggle-btn.active {
  border-color: currentColor;
}

.exam-toggle-true.active {
  border-color: var(--color-success);
  background: rgba(58,140,92,0.08);
  color: var(--color-success);
}

.exam-toggle-false.active {
  border-color: var(--color-error);
  background: rgba(192,85,58,0.08);
  color: var(--color-error);
}

.exam-q-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.exam-q-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.exam-q-num {
  font-weight: 700;
  color: var(--color-deep);
}

.exam-q-module,
.exam-q-subject {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--surface-secondary);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.exam-q-answered-badge {
  font-size: 0.75rem;
  color: var(--color-success);
  background: rgba(58,140,92,0.1);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.exam-q-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
}

.exam-q-nav-btns {
  display: flex;
  align-items: center;
  gap: 8px;
}

.exam-q-nav-pos {
  font-size: 0.85rem;
  color: var(--text-muted);
  min-width: 80px;
  text-align: center;
}

@media (max-width: 768px) {
  .exam-subq {
    flex-direction: column;
    gap: 8px;
    padding: 12px;
  }

  .exam-subq-toggle {
    width: 100%;
    justify-content: flex-start;
  }

  .exam-q-meta {
    flex-wrap: wrap;
    gap: 6px;
  }

  .exam-q-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .exam-q-nav-btns {
    justify-content: center;
  }
}