/* TOC Sidebar */
.post-wrapper {
  position: relative;
}

.toc-sidebar {
  position: fixed;
  left: max(1em, calc((100vw - 800px) / 2 - 250px));
  top: 6em;
  width: 220px;
  max-height: calc(100vh - 8em);
  overflow-y: auto;
  font-size: 0.9em;
  line-height: 1.6;
}

.toc-title {
  font-weight: bold;
  margin-bottom: 0.5em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid #ddd;
}

.toc-sidebar #TableOfContents ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.toc-sidebar #TableOfContents ul ul {
  padding-left: 1.2em;
}

.toc-sidebar #TableOfContents li {
  margin: 0.2em 0;
}

.toc-sidebar #TableOfContents a {
  text-decoration: none;
  color: #555;
  display: block;
  padding: 2px 4px;
  border-radius: 3px;
  transition: color 0.2s, background 0.2s;
}

.toc-sidebar #TableOfContents a:hover {
  color: #333;
  background: #f0f0f0;
}

.toc-sidebar #TableOfContents a.active {
  color: #0070f3;
  background: #eef6ff;
  font-weight: 600;
}

/* Scrollbar for TOC */
.toc-sidebar::-webkit-scrollbar {
  width: 4px;
}
.toc-sidebar::-webkit-scrollbar-thumb {
  background: #ccc;
  border-radius: 2px;
}

/* Hide when not enough space */
@media (max-width: 1200px) {
  .toc-sidebar {
    display: none;
  }
}