/* ==========================================================================
   FORMA 40+ — THE TRACK VISUAL SYSTEM
   Recurring signature element: measurement lines, progression, age timeline
   ========================================================================== */

.the-track {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  user-select: none;
}

/* Base horizontal track line */
.the-track--horizontal {
  height: 24px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  padding-bottom: 4px;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.the-track--dark {
  border-bottom-color: var(--border-dark-strong);
}

.the-track__tick {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--text-subtle);
  transition: color var(--transition-snappy);
}

.the-track__tick::after {
  content: '';
  display: block;
  width: 1px;
  height: 6px;
  background-color: var(--border-strong);
  margin-top: 4px;
  transition: height var(--transition-snappy), background-color var(--transition-snappy);
}

.the-track--dark .the-track__tick {
  color: var(--text-inverse-muted);
}

.the-track--dark .the-track__tick::after {
  background-color: var(--border-dark-strong);
}

.the-track__tick.is-active,
.the-track__tick:hover {
  color: var(--accent-blue);
}

.the-track--dark .the-track__tick.is-active,
.the-track--dark .the-track__tick:hover {
  color: #5992FF;
}

.the-track__tick.is-active::after,
.the-track__tick:hover::after {
  height: 10px;
  background-color: var(--accent-blue);
  width: 2px;
}

.the-track--dark .the-track__tick.is-active::after,
.the-track--dark .the-track__tick:hover::after {
  background-color: #5992FF;
}

/* The Age Track Navigation */
.age-track-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  position: relative;
  padding: 1.5rem 0;
}

.age-track-nav__line {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: repeating-linear-gradient(
    to right,
    var(--border-strong) 0,
    var(--border-strong) 8px,
    transparent 8px,
    transparent 12px
  );
  z-index: 1;
}

.age-track-nav__point {
  position: relative;
  z-index: 2;
  background-color: var(--bg-canvas);
  padding: 0.4rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 1px solid var(--border-light);
  transition: all var(--transition-snappy);
  text-decoration: none;
}

.age-track-nav__point:hover,
.age-track-nav__point.is-active {
  border-color: var(--accent-blue);
  background-color: var(--bg-surface);
  transform: translateY(-2px);
}

.age-track-nav__age {
  font-family: var(--font-display);
  font-size: 1.85rem;
  line-height: 1;
  color: var(--text-main);
  letter-spacing: 0.04em;
}

.age-track-nav__point:hover .age-track-nav__age,
.age-track-nav__point.is-active .age-track-nav__age {
  color: var(--accent-blue);
}

.age-track-nav__label {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  margin-top: 2px;
}

/* Track Progression Bar for Articles */
.track-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: var(--accent-blue);
  width: 0%;
  z-index: 999;
  transition: width 0.1s linear;
}

/* Ruler Separator */
.track-ruler {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem 0;
  overflow: hidden;
}

.track-ruler__line {
  flex: 1;
  height: 1px;
  background-color: var(--border-light);
  position: relative;
}

.track-ruler--dark .track-ruler__line {
  background-color: var(--border-dark);
}

.track-ruler__stamp {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-subtle);
  white-space: nowrap;
}

.track-ruler--dark .track-ruler__stamp {
  color: var(--text-inverse-muted);
}

/* Metric Track Item */
.metric-track {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  border-left: 2px solid var(--accent-blue);
  padding-left: 0.85rem;
}

.metric-track--orange {
  border-left-color: var(--accent-orange);
}

.metric-track__value {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  line-height: 0.9;
  color: var(--text-main);
}

.metric-track__unit {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .age-track-nav {
    overflow-x: auto;
    justify-content: flex-start;
    gap: 1.25rem;
    padding: 1rem 0;
    -webkit-overflow-scrolling: touch;
    width: 100%;
    box-sizing: border-box;
  }
  .age-track-nav__line {
    display: none;
  }
  .age-track-nav__point {
    flex-shrink: 0;
    min-width: 100px;
  }
}

@media (max-width: 640px) {
  .track-ruler__stamp {
    font-size: 0.62rem;
    letter-spacing: 0.1em;
  }
  .metric-track__value {
    font-size: 2.2rem;
  }
}