/* ==========================================================================
   u.cash - Timeline Component
   Vertical timeline with alternating entries, gold line, stagger reveals.
   ========================================================================== */

/* ---- Timeline Container ---- */

.timeline {
  position: relative;
  padding: var(--space-xl) 0;
}

/* Gold center line */
.timeline::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    180deg,
    transparent 0%,
    var(--color-gold-primary) 10%,
    var(--color-gold-primary) 90%,
    transparent 100%
  );
}

/* ---- Timeline Entry ---- */

.timeline-entry {
  position: relative;
  padding-left: calc(32px + var(--space-xl));
  padding-bottom: var(--space-2xl);
}

.timeline-entry:last-child {
  padding-bottom: 0;
}

/* ---- Timeline Dot ---- */

.timeline-dot {
  position: absolute;
  left: 8px;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  background: var(--color-bg-primary);
  border: 2px solid var(--color-gold-primary);
  z-index: 2;
  transition:
    background-color var(--transition-base),
    box-shadow var(--transition-base);
}

.timeline-dot::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-gold-primary);
}

/* Active/highlighted entry */
.timeline-entry.active .timeline-dot,
.timeline-entry:hover .timeline-dot {
  background: var(--color-gold-primary);
  box-shadow: var(--shadow-gold);
}

.timeline-entry.active .timeline-dot::after {
  background: var(--color-bg-primary);
}

/* ---- Timeline Date ---- */

.timeline-date {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-gold-primary);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

/* ---- Timeline Content Card ---- */

.timeline-content {
  background: var(--color-glass-bg);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition:
    border-color var(--transition-base),
    box-shadow var(--transition-base),
    transform var(--transition-base);
}

.timeline-content:hover {
  border-color: var(--color-gold-glow);
  box-shadow: var(--shadow-gold);
  transform: translateX(4px);
}

.timeline-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
}

.timeline-description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* Tags / badges within timeline */
.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.timeline-tag {
  font-size: var(--text-xs);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--color-gold-subtle);
  color: var(--color-gold-primary);
  border: 1px solid var(--color-gold-muted);
}

/* ---- Timeline Icon (optional) ---- */

.timeline-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-gold-subtle);
  color: var(--color-gold-primary);
  margin-bottom: var(--space-sm);
  flex-shrink: 0;
}

.timeline-icon svg {
  width: 20px;
  height: 20px;
  fill: var(--color-gold-primary);
}

/* ---- Year Marker ---- */

.timeline-year {
  position: relative;
  padding-left: calc(32px + var(--space-xl));
  margin-bottom: var(--space-lg);
}

.timeline-year-label {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  color: var(--color-gold-primary);
  position: relative;
  display: inline-block;
}

.timeline-year::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 50%;
  width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  background: var(--color-gold-primary);
  transform: translateY(-50%);
  z-index: 2;
  box-shadow: var(--shadow-gold);
}

/* ---- Stagger Reveal Animations ---- */

.timeline-entry.reveal {
  opacity: 0;
  transform: translateY(20px);
}

.timeline-entry.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Desktop: Alternating Layout ---- */

@media (min-width: 768px) {
  .timeline {
    max-width: 900px;
    margin-inline: auto;
  }

  .timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .timeline-entry {
    width: 50%;
    padding-left: 0;
    padding-right: var(--space-xl);
  }

  /* Even entries: right side */
  .timeline-entry:nth-child(even) {
    margin-left: 50%;
    padding-left: var(--space-xl);
    padding-right: 0;
  }

  /* Left side dots */
  .timeline-entry .timeline-dot {
    left: auto;
    right: -9px;
  }

  /* Right side dots (even) */
  .timeline-entry:nth-child(even) .timeline-dot {
    right: auto;
    left: -9px;
  }

  /* Left side hover direction */
  .timeline-entry .timeline-content:hover {
    transform: translateX(-4px);
  }

  /* Right side hover direction */
  .timeline-entry:nth-child(even) .timeline-content:hover {
    transform: translateX(4px);
  }

  /* Year markers centered */
  .timeline-year {
    padding-left: 0;
    text-align: center;
    margin-bottom: var(--space-xl);
  }

  .timeline-year::before {
    left: 50%;
    transform: translate(-50%, -50%);
  }

  /* Stagger reveal - alternate direction */
  .timeline-entry.reveal {
    transform: translateX(-20px);
  }

  .timeline-entry:nth-child(even).reveal {
    transform: translateX(20px);
  }

  .timeline-entry.reveal.visible,
  .timeline-entry:nth-child(even).reveal.visible {
    transform: translateX(0);
  }
}

@media (min-width: 992px) {
  .timeline-entry {
    padding-right: var(--space-2xl);
  }

  .timeline-entry:nth-child(even) {
    padding-left: var(--space-2xl);
  }
}