.main-content {
  flex: 1;
  min-width: 0;
  padding: 5px;
  max-width: 920px;
  width: 100%;
  margin: 15px auto;
}

@media (max-width: 1023px) {
  .main-content {
    padding: 20px 16px;
    width: 100%;
    flex: 0 0 100%;
  }
}

@media (max-width: 639px) {
  .main-content {
    padding: 16px 12px;
  }
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.breadcrumb a {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  background: var(--bg-table-stripe);
  border: 1px solid var(--border-table);
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  color: var(--primary-base);
  text-decoration: none;
  transition: all var(--ease-fast);
}

.breadcrumb a:hover {
  background: var(--primary-base);
  border-color: var(--primary-base);
  color: var(--text-inverse);
}

.breadcrumb .sep {
  color: var(--text-muted);
  font-weight: 700;
}

.breadcrumb .current {
  display: inline-flex;
  align-items: center;
  padding: 7px 14px;
  background: var(--bg-success);
  border: 1px solid var(--border-success);
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-success);
}

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

.quiz-category-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--bg-table-stripe);
  border: 1px solid var(--border-table);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  color: var(--primary-base);
  margin-bottom: 12px;
}

.quiz-page-header h1 {
  font-size: 32px;
  line-height: 1.25;
  font-weight: 800;
  color: var(--text-heading);
  margin: 0 0 10px;
}

@media (max-width: 768px) {
  .quiz-page-header h1 {
    font-size: 24px;
  }
}

.quiz-description {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-paragraph);
  margin: 0;
}

.quiz-actions {
  display: flex;
  justify-content: center;
  margin: 20px 0;
}

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

.reset-quiz-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  background: var(--bg-surface);
  border: 1px solid var(--border-5);
  border-radius: 12px;
  color: var(--text-danger);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--ease-fast);
}

.reset-quiz-btn:hover {
  background: var(--border-5);
  border-color: var(--border-5);
  color: var(--text-inverse);
  transform: translateY(-1px);
}

@media (max-width: 768px) {
  .reset-quiz-btn {
    width: 100%;
    max-width: 280px;
  }
}

.quiz-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}

@media (max-width: 768px) {
  .quiz-meta {
    justify-content: center;
  }
}

.meta-item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--bg-body);
  border: 1px solid var(--border-table);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-paragraph);
  text-decoration: none;
  transition: all var(--ease-fast);
}

.meta-item:hover {
  background: var(--bg-surface);
  border-color: var(--border-3);
}

.quiz-meta a.meta-item {
  margin-left: auto;
  background: var(--bg-table-stripe);
  border-color: var(--border-table);
  color: var(--primary-base);
  font-weight: 700;
}

.quiz-meta a.meta-item:hover {
  background: var(--primary-base);
  border-color: var(--primary-base);
  color: var(--text-inverse);
}

@media (max-width: 768px) {
  .quiz-meta a.meta-item {
    width: 100%;
    margin-left: 0;
  }
}

.questions-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 32px;
}

.question-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-table);
  border-radius: var(--radius-md, 8px);
  padding: 24px;
  box-shadow: var(--shadow-1);
}

.question-card .question-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.question-card .question-header .q-number {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary-base), var(--primary-hover));
  color: var(--text-inverse);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
}

.question-card .question-header .q-text {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-heading);
  line-height: 1.5;
  flex: 1;
  padding-top: 6px;
}

.question-card .options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

@media (max-width: 639px) {
  .question-card .options-grid {
    grid-template-columns: 1fr;
  }
}

.question-card .option-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  border: 2px solid var(--border-table);
  border-radius: var(--radius-sm, 4px);
  background: var(--bg-surface);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-paragraph);
  text-align: left;
  width: 100%;
  position: relative;
  overflow: hidden;
}

.question-card .option-btn .opt-label {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  background: var(--bg-input);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
}

.question-card .option-btn .opt-text {
  flex: 1;
  line-height: 1.4;
}

.question-card .option-btn:hover:not(:disabled) {
  border-color: var(--primary-base);
  background: var(--bg-table-stripe);
  color: var(--primary-base);
}

.question-card .option-btn:hover:not(:disabled) .opt-label {
  background: var(--primary-base);
  color: var(--text-inverse);
}

.question-card .option-btn.correct {
  border-color: var(--border-6);
  background: var(--bg-success);
  color: var(--text-success);
  cursor: default;
}

.question-card .option-btn.correct .opt-label {
  background: var(--border-6);
  color: var(--text-inverse);
}

.question-card .option-btn.correct::after {
  content: '\2713';
  position: absolute;
  right: 12px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-success);
}

.question-card .option-btn.wrong {
  border-color: var(--border-5);
  background: var(--bg-danger);
  color: var(--text-danger);
  cursor: default;
}

.question-card .option-btn.wrong .opt-label {
  background: var(--border-5);
  color: var(--text-inverse);
}

.question-card .option-btn.wrong::after {
  content: '\2717';
  position: absolute;
  right: 12px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text-danger);
}

.question-card .option-btn:disabled:not(.correct):not(.wrong) {
  opacity: .6;
}

.question-card .explanation-box {
  display: none;
  margin-top: 16px;
  padding: 14px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border-info);
  border-radius: var(--radius-sm, 4px);
  font-size: 14px;
  color: var(--text-paragraph);
  line-height: 1.6;
}

.question-card .explanation-box.show {
  display: flex;
  gap: 10px;
}

.question-card .explanation-box .exp-icon {
  flex-shrink: 0;
  font-size: 18px;
  margin-top: 1px;
}

.question-card .explanation-box .exp-label {
  font-weight: 700;
  color: var(--text-6);
  display: block;
  margin-bottom: 2px;
  font-size: 13px;
}

.pagination-wrapper {
  margin: 32px 0 24px;
}

.pagination-wrapper .pagination-info {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.pagination-wrapper .pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  flex-wrap: wrap;
}

.pagination-wrapper .pagination a, 
.pagination-wrapper .pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 38px;
  padding: 0 8px;
  border-radius: var(--radius-sm, 4px);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--ease-normal);
}

.pagination-wrapper .pagination a {
  border: 1.5px solid var(--border-table);
  color: var(--text-paragraph);
  background: var(--bg-surface);
}

.pagination-wrapper .pagination a:hover {
  border-color: var(--primary-base);
  color: var(--primary-base);
  background: var(--bg-input);
  text-decoration: none;
}

.pagination-wrapper .pagination a.prev-next {
  gap: 4px;
  padding: 0 12px;
  font-size: 13px;
}

.pagination-wrapper .pagination span.current-page {
  background: var(--primary-base);
  color: var(--text-inverse);
  border: 1.5px solid var(--primary-base);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.pagination-wrapper .pagination span.disabled {
  border: 1.5px solid var(--bg-table-stripe);
  color: var(--text-muted);
  cursor: not-allowed;
}

.pagination-wrapper .pagination span.ellipsis {
  border: none;
  color: var(--text-muted);
  min-width: 20px;
}

.score-strip {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-input);
  border: 1px solid var(--border-table);
  border-radius: var(--radius-sm, 4px);
  padding: 12px 18px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.score-strip .score-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary-base);
}

.score-strip .score-value {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary-hover);
  margin-left: auto;
}

.related-categories {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-table);
}

.related-categories h2 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 16px;
}

.related-categories a {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  background: var(--bg-body);
  border: 1px solid var(--border-table);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-paragraph);
  text-decoration: none;
  transition: all var(--ease-fast);
}

.related-categories a:hover {
  background: var(--primary-base);
  border-color: var(--primary-base);
  color: var(--text-inverse);
  transform: translateY(-1px);
}

@media (max-width: 768px) {
  .related-categories a {
    width: 100%;
    justify-content: center;
  }
}

.menu-toggle {
  display: none;
  width: 95px;
  height: 30px;
  border: none;
  background: var(--bg-surface);
  border-radius: 10px;
  cursor: pointer;
  color: var(--text-heading);
  box-shadow: var(--shadow-1);
}

.menu-toggle svg {
  width: 22px;
  height: 22px;
}

@media (max-width: 1023px) {
  .menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    position: fixed;
    left: 12px;
    top: 65px;
    z-index: 90;
    width: 111px;
    gap: 10px;
    border: 1px solid var(--border-table);
  }

  .th-left-sidebar,
  .gk-sidebar {
    position: fixed;
    top: 0;
    left: -280px;
    width: 260px;
    height: 100vh;
    background: var(--bg-surface);
    z-index: 999;
    padding: 20px;
    overflow-y: auto;
    transition: left 0.3s ease-in-out;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.2);
  }

  .th-left-sidebar.open,
  .gk-sidebar.open,
  .th-left-sidebar.active,
  .gk-sidebar.active {
    left: 0;
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
  }

  .sidebar-overlay.active {
    display: block;
  }
}