/* Viewer sections */

.viewer-sections {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 22rem;
  width: 100%;
  background: black;
  color: white;
  display: block;
  transition: transform 0.2s;
  transform: translateZ(0) translateY(25rem);
}
.nav-open .viewer-sections {
  transform: translateZ(0) translateY(0);
}
.checklist-open .viewer-sections {
  transform: translateZ(0) translateY(calc(3rem - 100vh));
  z-index: 20;
}

/* sections nav */

.sections-nav {
  z-index: 22;
  border-top: 1px solid white;
  background: black;
}
.sections-nav.viewer-nav > .nav-row {
  z-index: 24;
  background: black;
  padding: 0;
}
.sections-nav.viewer-nav > .nav-row > div {
  width: auto;
}
.sections-nav .link {
  position: relative;
  height: 3rem;
  padding: 0.25rem 1rem 0.25rem 0.25rem;
}
.sections-nav .credits-link {
  border-left: 1px solid white;
}
.sections-nav .subscribe-link {
  border-left: 1px solid white;
}
.sections-nav .share-link {
  border-left: 1px solid white;
}
.sections-nav .footnotes-link {
  border-left: 1px solid white;
}
.sections-nav .transcript-link {
  padding-left: 1rem;
  border-left: 1px solid white;
}
.sections-nav > .nav-row > div.credits-element,
.sections-nav > .nav-row > div.checklist-element {
  cursor: pointer;
  flex: 1;
  justify-content: flex-start;
}

/* scrolling part */

.viewer-sections .viewer-sections-scroll {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 19rem;
  white-space: nowrap;
  overflow-x: scroll;
  overflow-y: hidden;
}
.checklist-open .viewer-sections .viewer-sections-scroll {
  overflow-x: hidden;
}

/* clickable section indicators */

.viewer-sections .viewer-section {
  display: inline-flex;
  white-space: normal;
  width: 12rem;
  margin: 1rem 0 1rem 1rem;
  font-size: 16px;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity 0.2s;
}
.viewer-sections .viewer-section:hover {
  opacity: 1.0;
}
.viewer-sections .viewer-section.current-section {
  opacity: 1.0;
}
.viewer-sections .viewer-section:last-child {
  margin-right: 1rem;
}
.viewer-section > div {
  height: calc(20rem - 4px);
  width: 12rem;
}
.viewer-section .section-thumbnail {
  display: block;
  border-radius: 1rem;
  width: 12rem;
  height: 8rem;
  margin-bottom: 0.5rem;
  background-size: cover;
  background-position: center center;
  position: relative;
  overflow: hidden;
}
.viewer-section .section-duration {
  position: absolute;
  bottom: 0.5rem;
  left: 0.5rem;
  font-size: 0.75rem;
} 
.section-duration-white { color: white; }
.section-duration-black { color: black; }
.section-duration-white svg path { fill: white; }
.section-duration-black svg path { fill: black; }
.viewer-section .section-media {
  margin-top: 0.75rem;
  font-size: 12px;
}
.viewer-section .section-has-audio {
  position: absolute;
  bottom: -0.25rem;
  right: 0.25rem;
}
.viewer-section .section-has-audio svg {
  width: 2.5rem;
  height: 2.5rem;
}
.viewer-section .section-progress-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: #333;
}
.viewer-section .section-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  background: #fff;
}

/* Boxes that emerge from the nav */

.nav-return {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  position: relative;
  left: -0.5rem;
  padding: 0.5rem 0 0.2rem 0;
}