/* --- Notebook Sidebar --- */

.notebook-sidebar-wrapper {
  margin-bottom: 2rem;
}

.notebook-sidebar {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 0.5rem;
  padding: 1.25rem;
}

.notebook-sidebar-header {
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--link-col, #008AFF);
}

.notebook-title {
  font-family: var(--header-font, 'Open Sans', sans-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-col, #404040);
  text-decoration: none;
}

.notebook-title:hover {
  color: var(--link-col, #008AFF);
  text-decoration: none;
}

.notebook-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}

.notebook-nav-item {
  margin-bottom: 0.25rem;
}

.notebook-nav-item a {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: 0.25rem;
  color: var(--text-col, #404040);
  font-family: var(--header-font, 'Open Sans', sans-serif);
  font-size: 0.95rem;
  text-decoration: none;
  transition: background-color 0.15s ease;
}

.notebook-nav-item a:hover {
  background-color: #e9ecef;
  color: var(--link-col, #008AFF);
  text-decoration: none;
}

.notebook-nav-item.active a {
  background-color: var(--link-col, #008AFF);
  color: #fff;
  font-weight: 600;
}

/* Sticky sidebar on larger screens */
@media (min-width: 992px) {
  .notebook-sidebar {
    position: sticky;
    top: 1.5rem;
  }
}