/* 全局段落两端对齐 */
article p {
  text-align: justify;
  text-justify: inter-word;
}

/* TOC collapse: only H2 groups (toc level 1) are collapsible */
.md-sidebar--secondary [data-md-component="toc"] li[data-toc-level="1"] > nav {
  display: none;
}

.md-sidebar--secondary [data-md-component="toc"] li[data-toc-level="1"][data-toc-expanded="true"] > nav {
  display: block;
}

.md-sidebar--secondary [data-md-component="toc"] li[data-toc-level="1"][data-toc-user="collapsed"] > nav {
  display: none;
}

/* TOC: collapsible toggles (right sidebar) */
.md-sidebar--secondary [data-md-component="toc"] li.md-nav__item {
  position: relative;
}

.md-sidebar--secondary [data-md-component="toc"] li.md-nav__item > button.md-toc__toggle + a.md-nav__link {
  padding-right: 1.8rem;
}

.md-sidebar--secondary [data-md-component="toc"] button.md-toc__toggle {
  position: absolute;
  top: 0.2rem;
  right: 0.2rem;
  width: 1.4rem;
  height: 1.4rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.md-sidebar--secondary [data-md-component="toc"] button.md-toc__toggle:disabled {
  cursor: default;
  opacity: 0.5;
}

.md-sidebar--secondary [data-md-component="toc"] button.md-toc__toggle:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}

.md-sidebar--secondary [data-md-component="toc"] button.md-toc__toggle::before {
  content: "";
  display: inline-block;
  width: 0.9rem;
  height: 0.9rem;
  background-color: currentColor;
  -webkit-mask-image: var(--md-nav-icon--next);
  mask-image: var(--md-nav-icon--next);
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: contain;
  mask-size: contain;
  transition: transform 150ms ease-in-out;
}

.md-sidebar--secondary [data-md-component="toc"] li.md-nav__item[data-toc-expanded="true"] > button.md-toc__toggle::before {
  transform: rotate(90deg);
}