#toc-container {
  background: #fdfdfd;
  border: 1px solid #ddd;
  border-left: 4px solid #0073aa;
  padding: 20px;
  margin: 20px 0;
  border-radius: 8px;
  font-family: "Segoe UI", sans-serif;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

/* TOC Title */
#toc-container > strong {
  font-size: 18px;
  color: #0073aa;
  display: block;
  margin-bottom: 10px;
}

/* TOC List */
#toc-container ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

#toc-container ul li {
  margin: 6px 0;
  line-height: 1.5;
  border-left: 2px solid transparent;
  transition: all 0.2s ease;
}

#toc-container ul li:hover {
  border-left: 2px solid #0073aa;
  background: #f0f8ff;
  padding-left: 8px;
}

/* TOC Links */
#toc-container ul li a {
  text-decoration: none;
  color: #333;
  font-size: 15px;
}

#toc-container ul li a:hover {
  color: #0073aa;
  text-decoration: underline;
}

/* Áp dụng cho PC */
@media (min-width: 769px) {
#toc-container {
  background: #fdfdfd;
  border: 1px solid #ddd;
  border-left: 4px solid #0073aa;
  padding: 20px;
  margin: 20px 0;
  border-radius: 8px;
  font-family: "Segoe UI", sans-serif;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

/* TOC Title */
#toc-container > strong {
  font-size: 18px;
  color: #0073aa;
  display: block;
  margin-bottom: 10px;
}

/* TOC List */
#toc-container ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

#toc-container ul li {
  margin: 6px 0;
  line-height: 1.5;
  border-left: 2px solid transparent;
  transition: all 0.2s ease;
}

#toc-container ul li:hover {
  border-left: 2px solid #0073aa;
  background: #f0f8ff;
  padding-left: 8px;
}

/* TOC Links */
#toc-container ul li a {
  text-decoration: none;
  color: #333;
  font-size: 15px;
}

#toc-container ul li a:hover {
  color: #0073aa;
  text-decoration: underline;
}

/* Áp dụng cho PC */
@media (min-width: 769px) {