.article-timeline {
  /* Match the visual language of the event-map markers. */
  --timeline-news: var(--color-yellow);
  --timeline-test: var(--color-swot-blue);
  --timeline-guide: var(--color-swot-green);
  display: grid;
  gap: 1rem;
}

.article-timeline [hidden] {
  display: none;
}

.article-timeline__toolbar,
.article-timeline__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.article-timeline__toolbar {
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--color-line);
}

.article-timeline__filters,
.article-timeline__navigation,
.article-timeline__legend {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.article-timeline__filters button {
  min-height: 42px;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--color-line);
  border-radius: 2px;
  background: var(--color-white);
  color: var(--color-muted);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.article-timeline__filters button:hover,
.article-timeline__filters button:focus-visible {
  color: var(--color-ink);
  border-color: var(--color-ink);
}

.article-timeline__filters button[aria-pressed="true"] {
  border-color: var(--color-yellow-dark);
  background: var(--color-yellow-soft);
  color: var(--color-ink);
}

.article-timeline__navigation .button {
  min-width: 42px;
  min-height: 42px;
  padding: 0.45rem 0.7rem;
}

.article-timeline__navigation .article-timeline__reset {
  min-width: 0;
  padding-inline: 0.85rem;
}

.article-timeline__meta {
  min-height: 32px;
}

.article-timeline__meta p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.86rem;
  text-align: right;
}

.article-timeline__legend {
  color: var(--color-muted);
  font-size: 0.86rem;
}

.article-timeline__legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.article-timeline__mark {
  display: inline-block;
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  background: var(--timeline-news);
}

.article-timeline__mark--news {
  border-radius: 50%;
}

.article-timeline__mark--test {
  background: var(--timeline-test);
  transform: rotate(45deg);
}

.article-timeline__mark--guide {
  background: var(--timeline-guide);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.article-timeline__stage {
  position: relative;
  height: clamp(680px, 72vw, 760px);
  overflow: hidden;
  border: 1px solid var(--color-line);
  background: var(--color-white);
  box-shadow: var(--shadow);
  cursor: grab;
  /* The canvas owns one- and two-finger gestures; page scrolling remains
     available when a gesture starts outside the visualization. */
  touch-action: none;
  user-select: none;
}

.article-timeline__stage.is-dragging {
  cursor: grabbing;
}

.article-timeline__stage canvas {
  display: block;
  width: 100%;
  height: 100%;
  outline-offset: -4px;
}

.article-timeline__detail {
  position: absolute;
  z-index: 2;
  width: min(370px, calc(100% - 2rem));
  max-height: min(360px, calc(100% - 2rem));
  overflow-y: auto;
  padding: 1rem 1rem 1.05rem;
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--color-yellow);
  background: var(--color-white);
  box-shadow: 0 10px 30px rgba(23, 23, 23, 0.14);
  cursor: default;
  user-select: text;
}

.article-timeline__detail-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.article-timeline__detail-eyebrow {
  margin: 0;
  color: var(--color-yellow-dark);
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
}

.article-timeline__detail-close {
  flex: 0 0 auto;
  padding: 0;
  border: 0;
  border-bottom: 1px solid currentColor;
  background: transparent;
  color: var(--color-muted);
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
}

.article-timeline__detail h3 {
  margin: 0.45rem 0 0;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.24;
}

.article-timeline__detail h3 a {
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

.article-timeline__detail-meta,
.article-timeline__detail-event,
.article-timeline__detail-unavailable {
  margin: 0.65rem 0 0;
  color: var(--color-muted);
  font-size: 0.86rem;
}

.article-timeline__detail-event {
  padding-top: 0.65rem;
  border-top: 1px solid var(--color-line-soft);
  font-weight: 700;
}

.article-timeline__detail-unavailable {
  color: var(--color-muted);
  font-size: 0.8rem;
  font-style: italic;
}

.article-timeline__instructions,
.article-timeline__fallback {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.84rem;
}

.article-timeline__fallback {
  padding: 1rem;
  border: 1px solid var(--color-line);
  background: var(--color-white);
  color: #8b1e1e;
}

@media (max-width: 760px) {
  .article-timeline__toolbar,
  .article-timeline__meta {
    align-items: flex-start;
    flex-direction: column;
  }

  .article-timeline__navigation,
  .article-timeline__filters {
    width: 100%;
  }

  .article-timeline__filters button {
    flex: 1 1 auto;
  }

  .article-timeline__navigation .article-timeline__reset {
    flex: 1 1 auto;
  }

  .article-timeline__meta p {
    text-align: left;
  }

  .article-timeline__stage {
    height: 720px;
  }

  .article-timeline__detail {
    width: min(330px, calc(100% - 1rem));
    max-height: 300px;
  }
}

@media (max-width: 440px) {
  .article-timeline__filters button {
    flex-basis: calc(50% - 0.55rem);
  }

  .article-timeline__stage {
    height: 740px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .article-timeline__filters button {
    scroll-behavior: auto;
  }
}