.practice-page {
  padding-bottom: 48px;
}

.practice-head {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 20px;
}

.practice-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 10px;
}

.practice-breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}

.practice-title {
  font-size: 28px;
  line-height: 1.3;
  margin: 0 0 8px;
  color: var(--text-primary);
}

.practice-subtitle {
  margin: 0;
  font-size: 14px;
  color: var(--text-secondary);
}

.practice-state-card,
.practice-result-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 24px;
}

.state-error {
  color: var(--danger-color);
}

.practice-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 20px;
}

.practice-main {
  min-width: 0;
}

.practice-group {
  margin-bottom: 20px;
}

.practice-group-title {
  margin: 0 0 12px;
  font-size: 20px;
  color: var(--text-primary);
}

.practice-question-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 18px;
  margin-bottom: 12px;
}

.practice-question-head {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 10px;
  font-size: 13px;
  color: var(--text-secondary);
}

.practice-question-head span:first-child {
  font-weight: 700;
  color: var(--text-primary);
}

.practice-materials {
  margin-bottom: 10px;
  padding: 12px;
  border-radius: 10px;
  background: var(--bg-secondary);
}

.practice-material-item + .practice-material-item {
  margin-top: 8px;
}

.practice-question-stem {
  margin-bottom: 10px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-primary);
}

.practice-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.practice-option {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--bg-secondary);
}

.practice-option input {
  margin-top: 2px;
}

.option-key {
  min-width: 18px;
  font-weight: 600;
  color: var(--text-secondary);
}

.option-text {
  color: var(--text-primary);
  line-height: 1.6;
}

.practice-fill-blanks {
  display: grid;
  gap: 10px;
}

.practice-blank-item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
}

.practice-input,
.practice-textarea {
  width: 100%;
  border: 1px solid var(--border-normal);
  border-radius: 8px;
  padding: 8px 10px;
  background: var(--card-bg);
  color: var(--text-primary);
  font-size: 14px;
}

.practice-textarea {
  resize: vertical;
}

.practice-compound {
  display: grid;
  gap: 10px;
}

.practice-compound-child {
  border: 1px dashed var(--border-normal);
  border-radius: 10px;
  padding: 12px;
}

.practice-child-head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.practice-child-head span:first-child {
  color: var(--text-primary);
  font-weight: 600;
}

.practice-sidebar {
  position: sticky;
  top: 92px;
  align-self: start;
  display: grid;
  gap: 12px;
}

.answer-sheet-card,
.practice-action-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 14px;
}

.answer-sheet-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
  color: var(--text-primary);
}

.answer-sheet-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.sheet-item {
  border: 1px solid var(--border-normal);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--text-secondary);
  padding: 6px 0;
  cursor: pointer;
}

.sheet-item.answered {
  border-color: var(--success-color);
  color: var(--success-color);
  background: var(--success-light);
}

.sheet-tip {
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--text-tertiary);
}

.practice-action-card {
  display: grid;
  gap: 10px;
}

.practice-btn {
  border: none;
  border-radius: 8px;
  background: var(--primary-color);
  color: #fff;
  padding: 9px 14px;
  cursor: pointer;
}

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

.practice-btn.ghost {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-normal);
}

.submit-error {
  margin: 0;
  font-size: 13px;
  color: var(--danger-color);
}

.result-summary {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin: 14px 0;
}

.summary-item {
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 10px;
  background: var(--bg-secondary);
}

.summary-label {
  color: var(--text-tertiary);
  font-size: 12px;
  margin-bottom: 4px;
}

.summary-value {
  color: var(--text-primary);
  font-weight: 700;
  font-size: 18px;
}

.result-actions {
  margin-bottom: 14px;
}

.result-list {
  display: grid;
  gap: 12px;
}

.result-question {
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 12px;
}

.result-question-head {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.result-question-head .ok,
.result-child-head .ok {
  color: var(--success-color);
}

.result-question-head .bad,
.result-child-head .bad {
  color: var(--danger-color);
}

.result-answer-block {
  display: grid;
  gap: 6px;
  margin-top: 8px;
  font-size: 14px;
  color: var(--text-secondary);
}

.result-child-list {
  margin-top: 10px;
  display: grid;
  gap: 10px;
}

.result-child-item {
  border: 1px dashed var(--border-normal);
  border-radius: 10px;
  padding: 10px;
}

.result-child-head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

@media (max-width: 1024px) {
  .practice-layout {
    grid-template-columns: 1fr;
  }

  .practice-sidebar {
    position: static;
  }

  .result-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .practice-head {
    padding: 16px;
  }

  .practice-title {
    font-size: 22px;
  }

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