/* Sidebar wayfinding: make the current page and its section visible
   without relying on colour alone, and keep the active section pinned
   while its children scroll. Scoped to the primary (left) sidebar. */

/* 1. Current page: weight + tint + left bar (not just colour).
   The current page is an <a> on desktop and in the tablet drawer, and a
   <label> (opening the page's table of contents) in the drawer below 60em;
   both are direct children of the active item. */
.md-sidebar--primary li.md-nav__item--active > .md-nav__link--active {
  font-weight: 600;
  border-left: 3px solid var(--md-primary-fg-color);
  background-color: rgba(0, 148, 133, 0.1);
}
body[data-md-color-scheme="slate"] .md-sidebar--primary li.md-nav__item--active > .md-nav__link--active {
  color: var(--md-default-fg-color);
}
@media screen and (max-width: 76.1875em) {
  .md-sidebar--primary li.md-nav__item--active > .md-nav__link--active {
    padding-left: calc(0.8rem - 3px); /* keep the text aligned despite the bar */
  }
}
@media screen and (min-width: 76.25em) {
  .md-sidebar--primary li.md-nav__item--active > .md-nav__link--active {
    margin-left: -0.6rem;
    padding: 0.15rem 0.4rem 0.15rem calc(0.6rem - 3px);
    border-radius: 0 0.2rem 0.2rem 0;
  }
}

/* 2. Ancestors of the current page: bold, so the path reads top-down. */
.md-sidebar--primary li.md-nav__item--nested.md-nav__item--active > label.md-nav__link {
  font-weight: 600;
  color: var(--md-default-fg-color);
}

/* 3. Keep the active section's label pinned to the top of the sidebar
   while its pages scroll underneath (one row per nesting level). */
@media screen and (min-width: 76.25em) {
  .md-sidebar--primary li.md-nav__item--nested.md-nav__item--active > label.md-nav__link {
    position: sticky;
    z-index: 2;
    margin-top: 0;
    padding-top: 0.4375rem; /* covers the row gap so nothing shows through */
    padding-bottom: 0.2rem;
    background-color: var(--md-default-bg-color);
    box-shadow: 0 1px 0 var(--md-default-fg-color--lightest);
  }
  /* Deeper labels extend left over the indent, so a label pinned below
     another fully covers that label's divider instead of leaving a stub. */
  .md-sidebar--primary .md-nav[data-md-level="0"] > .md-nav__list > li.md-nav__item--active > label.md-nav__link { top: 0; }
  .md-sidebar--primary .md-nav[data-md-level="1"] > .md-nav__list > li.md-nav__item--active > label.md-nav__link { top: 1.35rem; margin-left: -0.6rem; padding-left: 0.6rem; }
  .md-sidebar--primary .md-nav[data-md-level="2"] > .md-nav__list > li.md-nav__item--active > label.md-nav__link { top: 2.7rem; margin-left: -1.2rem; padding-left: 1.2rem; }
}

/* 4. Section toggles are keyboard-operable (see nav.js): show focus. */
.md-sidebar--primary label.md-nav__link:focus-visible,
.md-sidebar--primary a.md-nav__link:focus-visible {
  outline: 2px solid var(--md-primary-fg-color);
  outline-offset: 2px;
}

/* 5. Breadcrumb above the page title (rendered by overrides/main.html). */
.md-breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0 0.4rem;
  margin: 0 0 0.8rem;
  padding: 0;
  list-style: none;
  font-size: 0.7rem;
  color: var(--md-default-fg-color--light);
}
.md-breadcrumbs li + li::before {
  content: "\203A"; /* › */
  margin-right: 0.4rem;
  color: var(--md-default-fg-color--lighter);
}
.md-breadcrumbs li[aria-current="page"] {
  color: var(--md-default-fg-color);
  font-weight: 600;
}

/* 6. Link colour that meets WCAG AA on white (3.77:1 -> 5.25:1); same hue. */
body[data-md-color-scheme="default"][data-md-color-primary="teal"] {
  --md-typeset-a-color: #007a6c;
}