/* ── Container ─────────────────────────────────────────────────────────────── */

#timeline {
  position: fixed;
  bottom: 20px;
  left: 25%;
  width: 50%;
  height: 64px;
  display: flex;
  align-items: center;
  z-index: 100;
  user-select: none;
}

/* Faded background on pseudo-element so the mask doesn't affect content */
#timeline::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(12, 22, 16, 0.20);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 32px;
  pointer-events: none;
  z-index: 0;
}

/* ── Track ─────────────────────────────────────────────────────────────────── */

.timeline-track {
  flex: 1;
  position: relative;
  height: 100%;
  margin: 0 20px;
  z-index: 1;
}

.timeline-line {
  position: absolute;
  left: 10px;
  right: 10px;
  top: 50%;
  height: 1.5px;
  background: rgba(160, 160, 160, 0.50);
  transform: translateY(-50%);
}

/* ── End arrows (triangle tips on the line) ─────────────────────────────────── */

.timeline-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  outline: none;
}

.timeline-arrow--left {
  left: 0;
  border-top:    5px solid transparent;
  border-bottom: 5px solid transparent;
  border-right:  9px solid rgba(160, 160, 160, 0.55);
  transition: border-right-color 150ms ease;
}
.timeline-arrow--left:hover    { border-right-color: rgba(220, 220, 220, 0.90); }
.timeline-arrow--left:disabled { border-right-color: rgba(160, 160, 160, 0.15); cursor: default; }

.timeline-arrow--right {
  right: 0;
  border-top:    5px solid transparent;
  border-bottom: 5px solid transparent;
  border-left:   9px solid rgba(160, 160, 160, 0.55);
  transition: border-left-color 150ms ease;
}
.timeline-arrow--right:hover    { border-left-color: rgba(220, 220, 220, 0.90); }
.timeline-arrow--right:disabled { border-left-color: rgba(160, 160, 160, 0.15); cursor: default; }

/* ── Decade marks ──────────────────────────────────────────────────────────── */

.timeline-mark {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  pointer-events: none;
}

.timeline-tick {
  width: 2px;
  height: 10px;
  background: rgba(160, 160, 160, 0.65);
  border-radius: 1px;
  flex-shrink: 0;
}

.timeline-label {
  font-family: 'Roboto', sans-serif;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: rgba(255, 255, 255, 0.80);
  white-space: nowrap;
}

/* 1910 — the dated map */
.timeline-mark--dated .timeline-tick {
  height: 12px;
  background: var(--color-primary);
}
.timeline-mark--dated .timeline-label {
  color: var(--color-primary);
  font-weight: 500;
}

/* ── Dial ──────────────────────────────────────────────────────────────────── */

.timeline-dial {
  position: absolute;
  top: 50%;
  width: 18px;
  height: 18px;
  background: var(--color-primary);
  border: 2.5px solid #fff;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  cursor: grab;
  z-index: 2;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.45);
  transition: left 180ms ease;
}

.timeline-dial.dragging {
  cursor: grabbing;
  transition: none;
}

/* Year label above the dial */
.timeline-dial::before {
  content: attr(data-year);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  font-family: 'Roboto', sans-serif;
  font-size: 10px;
  font-weight: 500;
  color: #fff;
  background: var(--color-primary);
  padding: 2px 6px;
  border-radius: 4px;
  white-space: nowrap;
  pointer-events: none;
}