/* ============================================================
   MASTER TIMELINE — the one genuine sequence in the archive
   1943 → 2024, ordered by year, so a spine with event nodes is
   describing the data rather than decorating it. Node and spine
   colours are the category colours used by the storyline cards
   (see css/tokens.css); the line itself is a hairline, not a glow.
   ============================================================ */

.timeline-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s-3) var(--s-4);
  margin-bottom: var(--s-5);
}

.tl-btn {
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-1);
  color: var(--paper-dim);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 500;
  letter-spacing: var(--tr-label);
  text-transform: uppercase;
  padding: 8px 14px;
  min-height: 36px;
  cursor: pointer;
  transition: color var(--dur-1) var(--ease),
              border-color var(--dur-1) var(--ease),
              background var(--dur-1) var(--ease);
}

.tl-btn:hover {
  color: var(--paper-bright);
  border-color: var(--paper-dim);
}

.tl-btn:focus-visible {
  outline: 2px solid var(--alert-bright);
  outline-offset: 2px;
}

.tl-btn.active {
  background: var(--alert);
  border-color: var(--alert);
  color: var(--ink-0);
}

.tl-hint {
  font-family: var(--font-my);
  font-size: 13px;
  color: var(--muted);
}

/* ---------- the spine ---------- */
.timeline-wrapper {
  position: relative;
  padding-left: 36px;
}

.timeline-line {
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg,
    var(--alert) 0,
    var(--line-strong) 14%,
    var(--line) 82%,
    transparent 100%);
}

.timeline-events {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}

/* ---------- one event = one record row ---------- */
.tl-event {
  --cat: var(--muted);
  position: relative;
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  column-gap: var(--s-3);
  border: 1px solid var(--line);
  border-left: var(--spine) solid var(--cat);
  border-radius: 0 var(--r-2) var(--r-2) 0;
  background: var(--ink-1);
  padding: var(--s-3) var(--s-4);
  cursor: pointer;
  animation: fadeIn var(--dur-3) var(--ease);
  transition: background var(--dur-2) var(--ease),
              border-color var(--dur-2) var(--ease),
              transform var(--dur-2) var(--ease);
}

.tl-event[data-cat="timeline"]  { --cat: var(--cat-timeline); }
.tl-event[data-cat="places"]    { --cat: var(--cat-places); }
.tl-event[data-cat="observers"] { --cat: var(--cat-observers); }
.tl-event[data-cat="memory"]    { --cat: var(--cat-memory); }
.tl-event[data-cat="deep"]      { --cat: var(--cat-deep); }

/* the node, sitting on the spine */
.tl-event::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 21px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-0);
  border: 2px solid var(--cat);
  transition: background var(--dur-2) var(--ease),
              box-shadow var(--dur-2) var(--ease);
}

.tl-event:hover,
.tl-event:focus-visible {
  background: var(--ink-2);
  border-color: var(--line-strong);
  border-left-color: var(--cat);
  transform: translateX(2px);
}

/* An event with no archived record behind it: a fact on the line, not a link. */
.tl-event--static {
  cursor: default;
}

.tl-event--static:hover,
.tl-event--static:focus-visible {
  background: var(--ink-1);
  border-color: var(--line);
  border-left-color: var(--cat);
  transform: none;
}

.tl-event--static:hover::before {
  background: var(--ink-0);
  box-shadow: none;
}

.tl-event:hover::before,
.tl-event:focus-visible::before {
  background: var(--cat);
  box-shadow: 0 0 0 4px rgba(11, 12, 14, 0.9);
}

.tl-event .tl-year {
  grid-column: 1;
  grid-row: 1 / span 3;
  font-family: var(--font-display);
  font-size: 27px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--paper-bright);
  border-right: 1px solid var(--line-hair);
  padding-right: var(--s-3);
}

.tl-event .tl-title {
  grid-column: 2;
  font-family: var(--font-body);
  font-size: var(--fs-h4);
  font-weight: 600;
  color: var(--paper-bright);
  line-height: var(--lh-snug);
}

.tl-event .tl-title-my {
  grid-column: 2;
  font-family: var(--font-my);
  font-size: 14px;
  color: var(--muted-strong);
  margin-top: 2px;
}

.tl-event .tl-cat-tag {
  grid-column: 2;
  justify-self: start;
  align-self: center;
  margin-top: var(--s-2);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cat);
  border: 1px solid var(--line);
  border-radius: var(--r-1);
  padding: 2px 8px;
}

/* ---------- narrow ---------- */
@media (max-width: 640px) {
  .timeline-wrapper { padding-left: 26px; }
  .timeline-line { left: 4px; }
  .tl-event {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 2px;
    padding: var(--s-3);
  }
  .tl-event::before { left: -26px; top: 24px; width: 9px; height: 9px; }
  .tl-event .tl-year {
    grid-column: 1;
    grid-row: auto;
    font-size: 22px;
    border-right: none;
    border-bottom: 1px solid var(--line-hair);
    padding: 0 0 4px;
    margin-bottom: 4px;
  }
  .tl-event .tl-title,
  .tl-event .tl-title-my,
  .tl-event .tl-cat-tag { grid-column: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .tl-event {
    animation: none;
    transition: none;
  }

  .tl-event:hover,
  .tl-event:focus-visible {
    transform: none;
  }
}