.toc {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 4px;
  margin-bottom: 12px;
}
.toc__header {
  padding: 12px 16px;
  background: #f8f9fa;
  border-bottom: 1px solid #ddd;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.toc__header:hover {
  background: #f0f1f3;
}
.toc__title {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
}
.toc__toggle {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: #666;
}
.toc__toggle:hover {
  color: #333;
}
.toc__body {
  max-height: 400px;
  overflow-y: auto;
}
.toc__body--collapsed {
  display: none;
}
.toc__body::-webkit-scrollbar {
  width: 8px;
}
.toc__body::-webkit-scrollbar-track {
  background: #f1f1f1;
}
.toc__body::-webkit-scrollbar-thumb {
  background: #ccc;
  border-radius: 4px;
}
.toc__body::-webkit-scrollbar-thumb:hover {
  background: #bbb;
}
.toc__list, .toc__sublist {
  list-style: none;
  margin: 0;
  padding: 0;
}
.toc__item {
  border-bottom: 1px solid #f0f0f0;
}
.toc__item:last-child {
  border-bottom: none;
}
.toc__item:hover {
  background: #f8f9fa;
}
.toc__link {
  display: block;
  padding: 8px 16px;
  text-decoration: none;
  color: #333;
  font-size: 13px;
  line-height: 1.4;
}
.toc__link:hover {
  color: #0066cc;
}
.toc__link--active {
  color: #0066cc;
  font-weight: 600;
  background: #f0f8ff;
}
.toc__link--level-1 {
  padding-left: 16px;
  font-weight: 500;
}
.toc__link--level-2 {
  padding-left: 32px;
  font-size: 12px;
}
.toc__link--level-3 {
  padding-left: 48px;
  font-size: 12px;
}
.toc__link--level-4 {
  padding-left: 64px;
  font-size: 11px;
}
.toc__link--level-5 {
  padding-left: 80px;
  font-size: 11px;
}
.toc__link--level-6 {
  padding-left: 96px;
  font-size: 11px;
}
.toc__number {
  color: #666;
  margin-right: 8px;
  font-weight: 500;
}
.toc__text {
  display: inline;
}
.toc__loading, .toc__empty {
  padding: 12px;
  text-align: center;
  color: #666;
  font-style: italic;
  font-size: 13px;
}
.toc__no-content {
  padding: 16px;
  text-align: center;
  color: #666;
  font-size: 13px;
  line-height: 1.5;
}
.toc__no-content p {
  margin: 0 0 8px 0;
}
.toc__no-content p:last-child {
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .toc {
    position: static;
    margin-bottom: 16px;
  }
  .toc__body {
    max-height: 300px;
  }
  .toc__link--level-1 {
    padding-left: 12px;
  }
  .toc__link--level-2 {
    padding-left: 24px;
  }
  .toc__link--level-3 {
    padding-left: 36px;
  }
  .toc__link--level-4 {
    padding-left: 48px;
  }
  .toc__link--level-5 {
    padding-left: 60px;
  }
  .toc__link--level-6 {
    padding-left: 72px;
  }
}