/* Cómo funciona — F4 Step sequence. Vertical stack, numbering 01→04, connector line. */

.steps {
  background: var(--color-paper-2);
}

.steps__list {
  position: relative;
  max-width: 46rem;
}
.steps__list::before {
  content: "";
  position: absolute;
  left: 1.4rem;
  top: 1.6rem;
  bottom: 1.6rem;
  width: 1px;
  background: var(--color-rule);
}

.step {
  position: relative;
  display: grid;
  grid-template-columns: 2.8rem 1fr;
  gap: var(--space-lg);
  padding-block: var(--space-lg);
}
.step:first-child { padding-top: 0; }
.step:last-child { padding-bottom: 0; }

.step__num {
  position: relative;
  z-index: var(--z-raised);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  background: var(--color-surface);
  border: 1px solid var(--color-rule);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  transform: scale(0.85);
  transition: transform var(--dur-short) var(--ease-out),
              color var(--dur-short) var(--ease-out),
              border-color var(--dur-short) var(--ease-out);
}
.step__num.is-active {
  transform: scale(1);
  color: var(--color-accent-warm);
  border-color: var(--color-accent-warm);
}

@media (prefers-reduced-motion: reduce) {
  .step__num { transition-duration: 1ms; transform: none; }
}

.step__title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2xs);
}
.step__body p { color: var(--color-ink-2); line-height: 1.6; max-width: 52ch; }

@media (max-width: 40rem) {
  .step { grid-template-columns: 2.2rem 1fr; gap: var(--space-md); }
  .step__num { width: 2.2rem; height: 2.2rem; }
  .steps__list::before { left: 1.1rem; }
}