$padding-basis: 0.75em;

.d-toc-available {
  // the toc increases the timeline container's width
  // so as long as the toc is available in a topic
  // we want this width to remain for the timeline
  // so if the toc is toggled off, the position doesn't shift

  @media screen and (max-width: 1109px) {
    .d-toc-wrapper {
      width: 10em;
    }
  }

  @media screen and (min-width: 1110px) {
    .container.posts {
      grid-template-columns: auto 14.6em;
    }
  }
}

.d-toc-main {
  display: none;
  border-left: 1px solid var(--primary-low);
  box-sizing: border-box;
  a {
    display: block;
    padding: 0.15em 0;
    color: var(--primary-700);
    &.scroll-to-bottom {
      color: var(--tertiary);
      padding-left: $padding-basis;
      margin-top: 0.5em;
      font-size: var(--font-down-1);
    }
  }
  #d-toc {
    max-height: calc(100dvh - 7em - var(--header-offset));
    overflow: auto;
    ul {
      list-style-type: none;
      margin: 0;
      padding: 0;
    }
    li.d-toc-item {
      margin: 0;
      padding: 0;
      padding-left: $padding-basis;
      line-height: var(--line-height-large);
      > ul {
        max-height: 0;
        overflow: hidden;
        opacity: 0.5;
        transition: opacity 0.3s ease-in-out, max-height 0.3s ease-in-out;
      }
      &.active,
      .d-toc-wrapper.overlay & {
        ul {
          max-height: 500em;
          overflow: visible;
          opacity: 1;
        }
      }
      > a:hover {
        color: var(--primary);
      }
      &.direct-active > a {
        position: relative;
        color: var(--primary);
        &:before {
          content: "";
          width: 1px;
          margin-top: -1px;
          background-color: var(--tertiary);
          position: absolute;
          height: 100%;
        }
      }
    }

    > ul > li > ul {
      font-size: var(--font-down-1);
      > li:first-child {
        padding-top: 0.25em;
      }
      > li {
        padding-bottom: 0.15em;
      }
      li.direct-active > a:before {
        // it's odd that we need this
        margin-left: -1px;
      }

      li.d-toc-h2 ~ li.d-toc-h3,
      li.d-toc-h2 ~ li.d-toc-h4,
      li.d-toc-h2 ~ li.d-toc-h5,
      li.d-toc-h3 ~ li.d-toc-h4,
      li.d-toc-h3 ~ li.d-toc-h5,
      li.d-toc-h4 ~ li.d-toc-h5 {
        > a {
          padding-left: $padding-basis;
        }
      }
    }
  }
}

// active line marker
$selector: "> ul > li.direct-active > a:before";
$map: (
  "left": "html:not(.rtl)",
  "right": "html.rtl",
);

/*
// loop below generates styling for non-RTL and RTL
// Example:
html:not(.rtl) SELECTOR {
    left: -.75em
}
html.rtl SELECTOR {
    right: -.75em
}
*/
@each $prop, $parent in $map {
  #{$parent} #d-toc {
    #{$selector} {
      #{$prop}: (-$padding-basis);
    }
    > ul > li #{$selector} {
      #{$prop}: (-$padding-basis) * 2;
    }
  }
}
// END active line marker

.d-toc-mini,
a.d-toc-close {
  display: none;
}

.d-toc-timeline-toggle {
  display: none;
  position: fixed;
  bottom: 0;
  @include ellipsis;
  .d-icon-timeline {
    margin-right: 0.25em;
  }

  @media screen and (min-height: 1200px) {
    // on tall screens we don't want this button
    // to be incredibly distant
    position: absolute;
    .d-toc-timeline-visible & {
      bottom: -4em;
    }
    bottom: -6.5em;
  }
}

.topic-navigation.with-timeline:has(.timeline-docked) {
  // hide toggle when timeline is docked
  // (firefox doesn't support :has yet)
  .d-toc-timeline-toggle {
    display: none;
  }
}

.d-toc-timeline-toggleable {
  .d-toc-timeline-toggle {
    display: block;
    z-index: z("timeline");
    @media screen and (max-height: 480px) {
      // avoid overlapping timeline
      display: none;
    }
  }
  .with-topic-progress {
    .d-toc-main {
      display: block;
    }
    .d-toc-timeline-toggle {
      display: none;
    }
  }
}

.d-toc-timeline-visible {
  .d-toc-main,
  .d-toc-mini {
    display: block;
  }

  // core overrides when timeline is active
  .timeline-container {
    display: none;
  }
  .container.posts .topic-navigation.with-topic-progress {
    align-self: start;
  }
}

// overlayed timeline (on mobile and narrow screens)
.topic-navigation.with-topic-progress {
  .d-toc-timeline-toggle {
    display: none;
  }
  .d-toc-wrapper {
    position: fixed;
    margin-top: 0.25em;
    height: calc(100dvh - 50px - var(--header-offset));
    opacity: 0.5;
    right: -100vw;
    top: var(--header-offset);
    width: 75vw;
    max-width: 350px;
    background-color: var(--secondary);
    box-shadow: var(--shadow-dropdown);
    z-index: z("modal", "overlay");
    transition: all 0.2s ease-in-out;
    .d-toc-main {
      width: 100%;
      padding: 0.5em;
      height: 100%;
      #d-toc {
        max-height: calc(100% - 2.25em);
      }
    }
    &.overlay {
      right: 0;
      width: 75vw;
      opacity: 1;
      .d-toc-main {
        display: block;
        #d-toc li.d-toc-item ul {
          transition: none;
        }
      }
    }

    a.scroll-to-bottom {
      margin-top: 0.33em;
    }

    a.scroll-to-bottom,
    a.d-toc-close {
      display: inline-block;
      padding: 0.5em;
    }

    .d-toc-icons {
      position: absolute;
      background: var(--secondary);
      right: 1.5em;
      top: 0.25em;
      z-index: z("timeline");
    }
  }
}

#topic-progress-wrapper {
  align-items: stretch;
  .d-toc-mini {
    display: none;

    height: 100%;
    .btn {
      height: 100%;
    }
  }

  .staff & {
    .topic-admin-menu-button-container {
      margin-left: 0.5em;
    }
  }
}

.d-toc-timeline-toggleable {
  #topic-progress-wrapper .d-toc-mini {
    display: block;
  }
}

// core sets first child's top margin to 0
// ensure it's also 0 when TOC markup is first
.cooked > div[data-theme-toc]:first-child + * {
  margin-top: 0px;
}

// RTL Support
.rtl {
  .d-toc-main {
    border-left: none;
    border-right: 1px solid var(--primary-low);

    #d-toc li.d-toc-item,
    a.scroll-to-bottom {
      padding-left: 0;
      padding-right: $padding-basis;
    }
  }

  .d-toc-timeline-visible .topic-navigation.with-topic-progress .d-toc-wrapper {
    right: unset;
    left: -100vw;
    &.overlay {
      right: unset;
      left: 0;
    }
  }
}

// Composer preview notice
.edit-title .d-editor-preview [data-theme-toc] {
  background: var(--tertiary);
  color: var(--secondary);
  position: sticky;
  z-index: 1;
  top: 0;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  &:before {
    content: "#{$composer_toc_text}";
  }
}

// Docs plugin outlet
.below-docs-topic-outlet.d-toc-wrapper {
  position: sticky;
  top: calc(var(--header-offset, 60px) + 1em);
  max-height: calc(100dvh - 2em - var(--header-offset, 60px));
}