_sidebar.css

/* Sidebar */
/* ========================================================================== */
:root {
  --_sidebar-inset: 20px;
  --_sidebar-list-inset: 0.85em;
  --_sidebar-scrollbar-width: 10px; /* macOS overlay scrollbar default */

  @supports (scrollbar-width: auto) {
    --_sidebar-scrollbar-width: 4px;
  }
}

.app-nav-merged,
.sidebar-nav {
  > * {
    margin-inline: var(--_sidebar-inset);

    &:first-child {
      margin-top: 0;
    }
  }

  > hr {
    margin-inline: 0;
  }

  ul {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  > ul {
    > * {
      margin-left: var(--_sidebar-inset);
    }

    ul {
      padding-left: var(--_sidebar-list-inset);
    }

    > li {
      &.group {
        padding-top: var(--sidebar-group-spacing);
        border-top: var(--sidebar-group-border);

        &:has(+ :not(.group)),
        &:last-child {
          border-bottom: var(--sidebar-group-border);
        }
      }
    }
  }

  li {
    margin-block: var(--sidebar-link-spacing);

    > p {
      margin: 0;

      /* Text-only <p> tags */
      &.group-title {
        margin-right: var(--_sidebar-inset);
        margin-bottom: var(--sidebar-group-title-spacing);
        padding-bottom: var(--sidebar-group-title-spacing);
        border-bottom: var(--sidebar-group-title-border);
        color: var(--sidebar-group-title-color);
        font-size: var(--sidebar-group-title-font-size);
        font-weight: var(--sidebar-group-title-font-weight);

        &[role='button'] {
          cursor: pointer;
          user-select: none;

          &:focus-visible {
            outline: 2px solid currentColor;
            outline-offset: 2px;
          }
        }
      }
    }

    a {
      display: block;
      padding-right: var(--_sidebar-inset);
      overflow: hidden;

      &:has(img, svg) {
        display: flex;
        align-items: center;
        gap: 0.25em;
      }
    }

    &.active {
      > a {
        color: var(--sidebar-link-color-active);
      }
    }

    &.collapse {
      > :not(a, p:has(> a.page-link)):not(.group-title) {
        display: none;
      }
    }
  }
}

.sidebar {
  visibility: hidden;
  position: absolute;
  z-index: var(--z-sidebar);
  top: 0;
  bottom: 0;
  left: 0;
  translate: calc(0px - var(--sidebar-width));
  width: var(--sidebar-width);
  overscroll-behavior: contain;
  border-right: 1px solid var(--sidebar-border-color);
  background: var(--sidebar-bg);
  color: var(--sidebar-color);
  font-size: var(--sidebar-font-size);
  transition:
    translate var(--duration-medium) ease,
    visibility var(--duration-medium);

  /* Non-webkit browsers: style scrollbar for consistency */
  @supports (scrollbar-width: auto) {
    &::-webkit-scrollbar {
      width: var(--_sidebar-scrollbar-width);
    }

    &::-webkit-scrollbar-thumb {
      border-radius: var(--_sidebar-scrollbar-width);
      background: transparent;
    }

    &:hover {
      &::-webkit-scrollbar-thumb {
        background: rgba(136, 136, 136, 0.4);
      }

      &::-webkit-scrollbar-track {
        background: rgba(136, 136, 136, 0.1);
      }
    }
  }

  a[href] {
    text-decoration-color: transparent;
    color: var(--sidebar-link-color);

    &:hover {
      translate: 0; /* HACK: Force Safari to render text-decoration */
      text-decoration-color: var(--sidebar-link-color-active);
    }
  }

  .app-name {
    margin: var(--sidebar-name-margin);
    color: var(--sidebar-name-color);
    font-family: var(--sidebar-name-font-family);
    font-size: var(--sidebar-name-font-size);
    font-weight: var(--sidebar-name-font-weight);
    text-align: center;
  }

  a.app-name-link {
    img {
      display: block;
      max-width: 100%;
    }

    &:hover {
      color: var(--sidebar-link-color-active);
      text-decoration-color: transparent;
    }
  }

  body:has(.sidebar.show) & {
    visibility: visible;
    translate: 0;
  }

  body.sticky & {
    position: fixed;
    overflow-y: auto;
    scrollbar-gutter: stable;
  }
}

.sidebar.sidebar-right {
  right: 0;
  left: auto;
  translate: var(--sidebar-width);
  border-right: 0;
  border-left: 1px solid var(--sidebar-border-color);
}

.sidebar-nav {
  li {
    a.page-link {
      border-radius: var(--border-radius);
      background: var(--sidebar-pagelink-bg);

      .active > &,
      :has(.active) > & {
        background: var(--sidebar-pagelink-bg-expanded);

        &:only-child {
          background: var(--sidebar-pagelink-bg-empty);
        }
      }

      .collapse > & {
        background: var(--sidebar-pagelink-bg-collapsed);
      }
    }
  }
}

.sidebar-toggle {
  display: flex;
  align-items: var(--sidebar-toggle-alignment);
  justify-content: start;
  position: absolute;
  z-index: var(--z-sidebar-toggle);
  top: 0;
  bottom: 0;
  width: var(--sidebar-toggle-width);
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition:
    background var(--duration-medium),
    translate var(--duration-medium) ease;

  @media screen and (any-hover) {
    &:hover {
      background: color-mix(
        in srgb,
        var(--sidebar-toggle-bg-hover) 10%,
        transparent
      );
    }
  }

  body:where(:has(.sidebar.show)) & {
    translate: var(--sidebar-width);
    transition:
      background 0s,
      translate var(--duration-medium) ease;
  }

  body.sticky & {
    position: fixed;
  }

  /* Increase tap target size on touch-only devices */
  @media screen and (any-hover: none) {
    width: calc(var(--content-margin-inline) - 10px);
  }
}

.sidebar-toggle-button {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: var(--sidebar-toggle-height);
  width: var(--sidebar-toggle-width);
  margin-block: var(--sidebar-toggle-margin-block);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  background: var(--sidebar-toggle-bg);
  color: var(--sidebar-toggle-color);
  transition-duration: var(--duration-medium);
  transition-property: background, translate;

  span {
    --_size: 4px;

    display: block;
    height: var(--_size);
    width: var(--_size);
    border-radius: 100vh;
    background: currentColor;
    transition: background var(--duration-medium);

    &:nth-child(2) {
      margin-block: calc(var(--_size) - 1px);
    }
  }

  @media screen and (any-hover) {
    &:hover,
    body:where(:has(.sidebar-toggle:hover)) & {
      background: var(--sidebar-toggle-bg-hover);
      color: var(--sidebar-toggle-color-hover);
    }
  }
}

.sidebar-toggle.sidebar-right {
  right: 0;
  left: auto;
  justify-content: end;

  body:where(:has(.sidebar.sidebar-right.show)) & {
    translate: calc(0px - var(--sidebar-width));
  }

  .sidebar-toggle-button {
    border-radius: var(--border-radius) 0 0 var(--border-radius);
  }
}