/*
  DDSYS — Sección: Metodología de Incorporación
  Fondo secundario. Timeline horizontal en desktop, vertical en mobile.
  El relleno es secuencial (no scroll-scrubbed continuo): coherente
  con el resto del sitio, que evita efectos ligados en vivo al scroll.
*/

.methodology {
  background-color: var(--surface-alt);
  padding-block: var(--space-24);
}

.methodology__header {
  max-width: 640px;
  margin: 0 auto var(--space-16);
  text-align: center;
}

.methodology__title {
  font-size: var(--text-h2-mobile);
  line-height: 1.15;
  margin-bottom: var(--space-4);
}

.methodology__subtitle {
  font-size: var(--text-body-lg);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.methodology__intro {
  font-size: var(--text-body);
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-4);
}

.methodology__body {
  font-size: var(--text-body);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Timeline */
.methodology__timeline {
  position: relative;
  list-style: none;
  margin: var(--space-16) auto;
  padding: 0;
  max-width: var(--container-max);
  display: flex;
  flex-direction: column;
  gap: var(--space-12);
}

/* Línea base (gris) y línea de relleno (azul), verticales por
   defecto — mobile first. */
.methodology__timeline::before,
.methodology__timeline::after {
  content: "";
  position: absolute;
  left: 17px;
  top: 18px;
  bottom: 18px;
  width: 2px;
  z-index: 0;
}

.methodology__timeline::before {
  background-color: var(--surface-card-border);
}

.methodology__timeline::after {
  background-color: var(--color-brand);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 1200ms var(--ease-standard);
}

.methodology__timeline.is-revealed::after {
  transform: scaleY(1);
}

.methodology__step {
  position: relative;
  padding-left: 56px;
}

.methodology__node {
  position: absolute;
  left: 0;
  top: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--surface-card-border);
  color: var(--surface-page);
  font-family: var(--font-mono);
  /* Sin esto, la línea de relleno (.methodology__timeline::after) se
     pinta después en el orden del documento y tapa el número. */
  z-index: 1;
  font-size: 0.875rem;
  font-weight: var(--weight-medium);
  transition: background-color 400ms var(--ease-standard);
}

.methodology__timeline.is-revealed .methodology__step:nth-child(1) .methodology__node { transition-delay: 0ms; background-color: var(--color-brand); }
.methodology__timeline.is-revealed .methodology__step:nth-child(2) .methodology__node { transition-delay: 300ms; background-color: var(--color-brand); }
.methodology__timeline.is-revealed .methodology__step:nth-child(3) .methodology__node { transition-delay: 600ms; background-color: var(--color-brand); }
.methodology__timeline.is-revealed .methodology__step:nth-child(4) .methodology__node { transition-delay: 900ms; background-color: var(--color-brand); }

@media (prefers-reduced-motion: reduce) {
  .methodology__timeline::after {
    transition: none;
  }
  .methodology__node {
    transition: none;
  }
}

.methodology__step-title {
  font-size: 1.0625rem;
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-1);
}

.methodology__step-description {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 260px;
}

.methodology__cta {
  text-align: center;
  margin-top: var(--space-16);
}

.methodology__microcopy {
  margin-top: var(--space-3);
  font-size: var(--text-micro);
  color: var(--text-muted);
}

@media (min-width: 768px) {
  .methodology__timeline {
    flex-direction: row;
    justify-content: space-between;
    gap: var(--space-8);
  }

  .methodology__timeline::before,
  .methodology__timeline::after {
    left: 18px;
    right: 18px;
    top: 18px;
    bottom: auto;
    width: auto;
    height: 2px;
  }

  .methodology__timeline::after {
    transform: scaleX(0);
    transform-origin: left;
  }

  .methodology__timeline.is-revealed::after {
    transform: scaleX(1);
  }

  .methodology__step {
    flex: 1;
    padding-left: 0;
    padding-top: 56px;
    text-align: center;
  }

  .methodology__node {
    left: 50%;
    top: 0;
    transform: translateX(-50%);
  }

  .methodology__step-description {
    max-width: none;
    margin-inline: auto;
  }
}

@media (min-width: 1024px) {
  .methodology__title {
    font-size: var(--text-h2);
  }
}