.nt-error {
  border: 2px dashed var(--color-error);
  padding: 0 1rem;
  background: var(--color-white);
  color: var(--color-error);
}
.nt-timeline {
  margin-top: 1.5rem;
}
.nt-timeline-item {
  position: relative;
}
.nt-timeline-before {
  content: "";
  height: 0.75rem;
}
.nt-timeline-after {
  content: "";
  height: 3rem;
  margin-bottom: 1rem;
}

/* title */
.nt-timeline .nt-timeline-title {
  font-size: 1.1rem;
  margin-top: 0;
}

/* sub-title */
.nt-timeline-sub-title {
  position: absolute;
  width: 50%;
  margin-top: 0;
  top: 0.2rem;
  font-size: 0.9rem;
  color: var(--color-gray-800);
}
[data-md-color-scheme="slate"] .nt-timeline-sub-title {
  color: var(--color-gray-800);
}

/* content */
.nt-timeline .nt-timeline-content {
  font-size: 0.8rem;
  border-bottom: 2px dashed var(--color-border);
  padding-bottom: 1.2rem;
}

/* items */
.nt-timeline-items {
  display: flex;
  position: relative;
}
.nt-timeline-items > div {
  min-height: 5rem;
  padding-top: 0.1rem;
  padding-bottom: 1rem;
}

/* dot */
.nt-timeline-dot {
  position: relative;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background-color: var(--color-brand);
  position: absolute;
  top: 0;
  z-index: 2;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 0 1px var(--color-shadow), 0 1px 1px 0 var(--color-shadow),
    0 1px 3px 0 var(--color-shadow);
  border: 3px solid var(--color-white);
  background-color: var(--color-brand);
}
.nt-timeline-dot .icon {
  color: var(--color-white);
  font-size: 0.8rem;
  line-height: 1;
}
.nt-timeline-dot:not(.bigger) .icon {
  font-size: 0.5rem;
}
.nt-timeline-dot.bigger {
  width: 2rem;
  height: 2rem;
  padding: 0.15rem;
}

/* horizontal */
.nt-timeline.horizontal .nt-timeline-items {
  flex-direction: row;
  overflow-x: scroll;
}
.nt-timeline.horizontal .nt-timeline-items > div {
  min-width: 20rem;
  margin-right: 2.5rem;
}
.nt-timeline.horizontal.reverse .nt-timeline-items {
  flex-direction: row-reverse;
}
.nt-timeline.horizontal.center .nt-timeline-before {
  background-image: linear-gradient(transparent 0%, var(--color-brand) 100%);
  background-repeat: no-repeat;
  background-size: 100% 2px;
  background-position: 0 center;
}
.nt-timeline.horizontal.center .nt-timeline-after {
  background-image: linear-gradient(
    180deg,
    var(--color-brand) 0%,
    transparent 100%
  );
  background-repeat: no-repeat;
  background-size: 100% 2px;
  background-position: 0 center;
}
.nt-timeline.horizontal.center .nt-timeline-items {
  background-image: radial-gradient(
    circle,
    var(--color-brand) 0%,
    var(--color-brand) 100%
  );
  background-repeat: no-repeat;
  background-size: 100% 2px;
  background-position: 0 center;
}
.nt-timeline.horizontal .nt-timeline-dot {
  left: 50%;
}
.nt-timeline.horizontal .nt-timeline-dot:not(.bigger) {
  top: calc(50% - 0.2rem);
}
.nt-timeline.horizontal .nt-timeline-dot.bigger {
  top: calc(50% - 0.75rem);
}

/* vertical */
.nt-timeline.vertical .nt-timeline-items {
  flex-direction: column;
}
.nt-timeline.vertical.reverse .nt-timeline-items {
  flex-direction: column-reverse;
}
.nt-timeline.vertical.center .nt-timeline-before {
  background: linear-gradient(transparent 0%, var(--color-brand) 100%) no-repeat
    center/2px 100%;
}
.nt-timeline.vertical.center .nt-timeline-after {
  background: linear-gradient(var(--color-brand) 0%, transparent 100%) no-repeat
    center/2px 100%;
}
.nt-timeline.vertical.center .nt-timeline-items {
  background: radial-gradient(
      circle,
      var(--color-brand) 0%,
      var(--color-brand) 100%
    )
    no-repeat center/2px 100%;
}
.nt-timeline.vertical.center .nt-timeline-dot {
  left: calc(50% - 0.5rem);
}
.nt-timeline.vertical.center .nt-timeline-dot:not(.bigger) {
  top: 0.5rem;
}
.nt-timeline.vertical.center .nt-timeline-dot.bigger {
  left: calc(50% - 1rem);
}
.nt-timeline.vertical.left {
  padding-left: 5rem;
}
.nt-timeline.vertical.left .nt-timeline-item {
  padding-left: 3.5rem;
}
.nt-timeline.vertical.left .nt-timeline-sub-title {
  left: -5rem;
  width: 5rem;
}
.nt-timeline.vertical.left .nt-timeline-before {
  background: linear-gradient(transparent 0%, var(--color-brand) 100%) no-repeat
    1.5rem/2px 100%;
}
.nt-timeline.vertical.left .nt-timeline-after {
  background: linear-gradient(var(--color-brand) 0%, transparent 100%) no-repeat
    1.5rem/2px 100%;
}
.nt-timeline.vertical.left .nt-timeline-items {
  background: radial-gradient(
      circle,
      var(--color-brand) 0%,
      var(--color-brand) 100%
    )
    no-repeat 1.5rem/2px 100%;
}
.nt-timeline.vertical.left .nt-timeline-dot {
  left: calc(1rem + 1px);
  top: 0.4rem;
}
.nt-timeline.vertical.left .nt-timeline-dot.bigger {
  top: 0;
  left: 0.5rem;
}
.nt-timeline.vertical.right {
  padding-right: 5rem;
}
.nt-timeline.vertical.right .nt-timeline-sub-title {
  right: -5rem;
  text-align: left;
  width: 5rem;
}
.nt-timeline.vertical.right .nt-timeline-item {
  padding-right: 3.5rem;
}
.nt-timeline.vertical.right .nt-timeline-before {
  background: linear-gradient(transparent 0%, var(--color-brand) 100%) no-repeat
    calc(100% - 1.5rem) / 2px 100%;
}
.nt-timeline.vertical.right .nt-timeline-after {
  background: linear-gradient(var(--color-brand) 0%, transparent 100%) no-repeat
    calc(100% - 1.5rem) / 2px 100%;
}
.nt-timeline.vertical.right .nt-timeline-items {
  background: radial-gradient(
      circle,
      var(--color-brand) 0%,
      var(--color-brand) 100%
    )
    no-repeat calc(100% - 1.5rem) / 2px 100%;
}
.nt-timeline.vertical.right .nt-timeline-dot {
  right: calc(1rem + 1px);
  top: 0.4rem;
}
.nt-timeline.vertical.right .nt-timeline-dot.bigger {
  top: 0.5rem;
  right: 0.5rem;
}
.nt-timeline.vertical.center:not(.alternate) .nt-timeline-item {
  padding-left: calc(50% + 2rem);
}
.nt-timeline.vertical.center:not(.alternate)
  .nt-timeline-item
  .nt-timeline-sub-title {
  left: 0;
  padding-right: 2rem;
  text-align: right;
}
.nt-timeline.vertical.center.alternate .nt-timeline-item:nth-child(odd) {
  padding-left: calc(50% + 2rem);
}
.nt-timeline.vertical.center.alternate
  .nt-timeline-item:nth-child(odd)
  .nt-timeline-sub-title {
  left: 0;
  padding-right: 2rem;
  text-align: right;
}
.nt-timeline.vertical.center.alternate .nt-timeline-item:nth-child(even) {
  text-align: right;
  padding-right: calc(50% + 2rem);
}
.nt-timeline.vertical.center.alternate
  .nt-timeline-item:nth-child(even)
  .nt-timeline-sub-title {
  right: 0;
  padding-left: 2rem;
  text-align: left;
}