/* 1. Toggle button at top-left corner */
#toc-toggle-btn {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 9999; /* Ensure it's on top */
  background-color: #444;
  color: white;
  border: none;
  border-radius: 4px;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 14px;
  opacity: 0.8;
  transition: opacity 0.3s;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

#toc-toggle-btn:hover {
  opacity: 1;
  background-color: #000;
}

/* 2. Sidebar container */
#toc-sidebar {
  position: fixed;
  top: 0;
  left: -300px; /* Hidden outside left side of screen by default */
  width: 280px;
  height: 100%;
  background-color: #f8f9fa;
  border-right: 1px solid #e9ecef;
  overflow-y: auto; 
  z-index: 9998;
  padding: 70px 20px 20px 20px; /* Top padding for button */
  transition: left 0.3s ease-in-out; 
  box-shadow: 2px 0 10px rgba(0,0,0,0.1);
  font-size: 0.8em;
}

/* Show sidebar when body has .toc-open class */
body.toc-open #toc-sidebar {
  left: 0;
  text-wrap-mode: nowrap;
}

/* 3. Adjust main content area - shift content right when sidebar opens */
/* If your blog main content container is .container or .wrapper, add it here */
body.toc-open .container, 
body.toc-open .wrapper,
body.toc-open article {
  margin-left: 280px; 
  transition: margin-left 0.3s ease-in-out;
}

/* 4. TOC content styles */
#toc-sidebar h3 {
  margin-top: 0;
  padding-bottom: 10px;
  border-bottom: 1px solid #ddd;
  font-size: 1em; /* Same as sidebar base font size */
}

#toc-sidebar ul {
  list-style: none;
  margin: 0;
}

#toc-sidebar ul li {
  margin-bottom: 8px;
}

/* Top-level ul has no indentation */
#toc-sidebar > ul {
  padding-left: 0;
}

/* All nested ul use same relative indentation, 20px per level */
#toc-sidebar ul ul {
  padding-left: 20px;
  margin-top: 5px;
}

#toc-sidebar a {
  text-decoration: none;
  color: #666;
  display: block;
  line-height: 1.4;
  transition: color 0.2s;
}

#toc-sidebar a:hover {
  color: #007bff;
}

#toc-sidebar a.active {
  color: #007bff;
  font-weight: bold;
  border-right: 3px solid #007bff;
}