/* Menu */
menu {
  display: flex;
  flex-direction: column;
  padding: 0;
  list-style: none;
}

menu > li {
  position: relative;
  flex-shrink: 0;
  padding: 0.375rem 0.5rem;
  margin: 0.5rem 0.25rem;
  cursor: pointer;
}

menu > li:hover {
  border-radius: var(--bd-radius);
  background-color: var(--bg-muted);
  color: var(--default);
  transition: background-color var(--tr-duration), color var(--tr-duration);
}

menu > li.selected {
  color: var(--accent);
}

menu > li.selected::before {
  position: absolute;
  top: 0.25rem;
  bottom: 0.25rem;
  left: -0.25rem;
  border-right: 2px solid currentColor;
  content: "";
}

menu > li.disabled {
  color: var(--muted);
  cursor: not-allowed;
}

menu > li > :is(a, a:hover) {
  color: inherit;
  text-decoration: none;
}

@media (min-width: 544px) {
  menu {
    flex-direction: row;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--bd-muted);
  }

  menu > li.selected::before {
    top: unset;
    right: 0;
    bottom: -0.5rem;
    left: 0;
    border-right: none;
    border-bottom: 2px solid currentColor;
    border-left: none;
  }

  menu > li > menu > li.selected::before {
    border-left: 2px solid currentColor;
  }
}

/* Sub-menus */
menu > li:has(> menu)::after {
  content: "▾";
}

menu > li > menu {
  position: absolute;
  z-index: 100;
  top: 100%;
  left: 0%;
  display: none;
  width: max-content;
  flex-direction: column;
  padding: 0.5rem;
  border: 1px solid var(--bd-muted);
  border-radius: var(--bd-radius);
  margin: 0;
  background: var(--bg-muted);
  color: var(--default);
  opacity: 0.25;
  transition: opacity var(--tr-duration);
}

menu > li:hover > menu {
  display: block;
  opacity: 1;
}

menu > li > menu > li {
  max-width: 70vw;
  margin: 0;
}

menu > li > menu > li:hover {
  background: var(--bg-subtle);
}

menu > li > menu > li > menu {
  top: 100%;
}

menu > li > menu > li.selected::before {
  top: calc(0.5 * var(--bd-radius));
  bottom: calc(0.5 * var(--bd-radius));
  left: 0;
  border-bottom: none;
}

@media (min-width: 544px) {
  menu > li > menu > li > menu {
    top: 0;
    left: 100%;
  }
}

/* Navigation */

nav {
  display: flex;
  margin: 0 0 1rem;
}

nav > menu {
  border-bottom: none;
  margin: 0;
}

nav :is(ul, ol) {
  padding: 0 0 0 1rem;
  margin: 0;
  list-style: none;
}

nav > :is(ul, ol) {
  padding-left: 0;
}

nav > ol {
  display: flex;
  flex-wrap: wrap;
}

nav > ol > li:not(:last-child):has(> a)::after {
  display: inline-block;
  margin: 0 0.25rem;
  color: var(--default);
  content: "/";
}

nav > ol > li:last-child {
  color: var(--default);
  font-weight: 600;
}

nav > ol > li:last-child > a {
  color: inherit;
}

nav ul {
  position: relative;
  overflow: hidden;
  padding: 0;
  color: var(--muted);
}

nav ul > li {
  position: relative;
  padding-left: 1.25rem;
  border-left: 1px solid transparent;
}

nav ul > li.disabled > a {
  color: var(--muted);
  cursor: not-allowed;
}

nav ul > li:hover {
  border-color: var(--accent);
}

nav ul > li.selected {
  color: var(--default);
  font-weight: 600;
}

nav ul > li.selected > a {
  color: inherit;
}

nav ul > li::before, nav ul > li::after {
  position: absolute;
  left: 0;
  content: "";
}

nav ul > li::before {
  top: 0.75rem;
  width: 1rem;
  height: 0;
  border-top: 1px solid var(--bg-subtle);
}

nav ul > li::after {
  top: -0.75rem;
  width: 0;
  height: 100%;
  border-left: 1px solid var(--bg-subtle);
}

nav > ul > li::after {
  top: 0.75rem;
}

nav > ul > li:last-child::after {
  display: none;
}