/* Base styles (Mobile first drawer) */
.custom-toc {
  position: fixed;
  top: 0;
  left: 0;
  width: 16rem;
  max-width: 80vw;
  height: 100vh;
  background-color: var(--layer1);
  border-right: 1px solid var(--border-subtle1);
  padding: 4rem 1.5rem 1.5rem 1.5rem;
  z-index: 115;
  transform: translateX(-100%);
  transition: transform 0.25s ease;
  overflow-y: auto;
  margin: 0;
}

.custom-toc.custom-toc-open {
  transform: translateX(0);
}

.custom-toc-backdrop {
  position: fixed;
  inset: 0;
  background: var(--black);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  z-index: 114;
}

.custom-toc-backdrop.custom-toc-open {
  opacity: 0.6;
  pointer-events: auto;
}

/* Floating button for mobile */
.custom-toc-toggle {
  position: fixed;
  right: 2rem;
  bottom: 6.5rem; /* Placed exactly above the back-to-top button (3rem bottom + 3rem height + 0.5rem gap) */
  width: 3rem;
  height: 3rem;
  border: 0;
  border-radius: 50%;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--interactive-background);
  color: var(--text-on-color);
  cursor: pointer;
  z-index: 113;
  transition: background-color 0.11s ease;
}

@media (max-width: 768px) {
  .custom-toc-toggle {
    right: 1rem;
    bottom: 5rem; /* Match mobile back-to-top (1.5rem bottom + 3rem height + 0.5rem gap) */
  }
}

.custom-toc-toggle:hover {
  background-color: var(--interactive-hover);
}

.custom-toc-toggle:active {
  background-color: var(--interactive-active);
}

.custom-toc-toggle::before {
  content: "";
  width: 1.25rem;
  height: 1.25rem;
  background-color: currentColor;
  mask-size: contain;
  mask-repeat: no-repeat;
  mask-position: center;
  mask-image: url("/assets/icons/menu.svg");
}

/* Common TOC styling */
.custom-toc-title {
  font-weight: 600;
  margin-bottom: 1rem;
  font-size: 1.125rem;
  color: var(--text-primary);
}

.custom-toc ul {
  list-style: none !important;
  padding: 0 !important;
  margin: 0 !important;
}

.custom-toc li {
  margin-top: 0.5rem !important;
  margin-bottom: 0.5rem !important;
  padding: 0 !important;
}

.custom-toc li::before {
  content: none !important;
}

.custom-toc a {
  text-decoration: none;
  color: var(--text-secondary);
  transition: color 0.11s;
  font-size: 0.875rem;
  display: block;
}

.custom-toc a:hover,
.custom-toc a.active {
  color: var(--link-hover);
}

.custom-toc a.active {
  font-weight: 600;
  color: var(--link);
}

/* Indentations based on heading level */
.custom-toc .toc-h2 { margin-left: 0; font-weight: 500; }
.custom-toc .toc-h3 { margin-left: 1rem; }
.custom-toc .toc-h4 { margin-left: 2rem; }
.custom-toc .toc-h5 { margin-left: 3rem; }
.custom-toc .toc-h6 { margin-left: 4rem; }

/* Large screens: docked to the left */
@media (min-width: 1440px) {
  .custom-toc-toggle {
    display: none;
  }

  .custom-toc-backdrop {
    display: none;
  }

  .custom-toc {
    transform: translateX(0); /* Always visible */
    top: 14rem; /* Lowered to avoid overlapping the initial uncollapsed header */
    left: auto;
    right: calc(50vw + 31rem); /* Aligns to the left of the article */
    width: 14rem;
    height: auto;
    max-height: calc(100vh - 12rem);
    background: transparent;
    border: none;
    border-right: 1px solid var(--border-subtle1); /* Line on the right to separate from content */
    padding: 0 1rem 0 0;
  }
}