/* ============================================================
   THM — Timeline Component (La era de la IA: 2024 → 2026 → 2028)
   ============================================================ */

.timeline {
  background: var(--color-bg-elevated);
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--color-border) 20%,
    var(--color-border) 80%,
    transparent 100%);
}

.timeline__track {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  position: relative;
  max-width: 1024px;
  margin: 0 auto;
}

/* Línea conectora horizontal entre hitos */
.timeline__track::before {
  content: '';
  position: absolute;
  top: 10px;
  left: 16%;
  right: 16%;
  height: 2px;
  background: var(--color-accent-grad);
  opacity: 0.35;
}

.timeline__milestone {
  position: relative;
  text-align: center;
  padding-top: var(--space-8);
}

/* Punto del hito */
.timeline__milestone::before {
  content: '';
  position: absolute;
  top: 3px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #ffffff;
  border: 3px solid var(--color-accent-1);
}

.timeline__milestone--active::before {
  background: var(--color-accent-1);
  box-shadow: var(--glow-accent);
}

.timeline__year {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.timeline__milestone h3 {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-2);
}

.timeline__milestone p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 280px;
  margin: 0 auto;
}

/* Píldora "ESTÁS AQUÍ" del hito activo */
.timeline__now {
  display: inline-block;
  margin-bottom: var(--space-3);
  padding: var(--space-1) var(--space-3);
  background: var(--color-accent-1);
  color: #ffffff;
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  border-radius: var(--radius-full);
}

.timeline__closing {
  text-align: center;
  max-width: 640px;
  margin: var(--space-12) auto 0;
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

@media (max-width: 768px) {
  .timeline__track {
    grid-template-columns: 1fr;
    gap: var(--space-10);
    max-width: 420px;
  }
  /* En vertical la línea conectora pasa a ser lateral izquierda */
  .timeline__track::before {
    top: 8%;
    bottom: 8%;
    left: 7px;
    right: auto;
    width: 2px;
    height: auto;
  }
  .timeline__milestone {
    text-align: left;
    padding-top: 0;
    padding-left: var(--space-8);
  }
  .timeline__milestone::before {
    top: 6px;
    left: 0;
    transform: none;
  }
  .timeline__milestone p {
    margin: 0;
  }
}