/* ─── How It Works ─────────────────────────────────── */

.how-it-works {
  padding: calc(var(--section-padding-v) * 2) var(--section-padding-h);
  background: var(--color-white);
}

.how-it-works__inner {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  max-width: 1728px;
  margin: 0 auto;
}

/* Columna izquierda — sticky */
.how-it-works__left {
  flex: 0 0 422px;
  position: sticky;
  top: calc(var(--section-padding-v) * 2);
  align-self: flex-start;
  display: flex;
  flex-direction: column;
  gap: calc(var(--space-sm) + var(--space-xs));
}

.how-it-works__label {
  font-size: var(--text-label);
  font-weight: var(--fw-medium);
  line-height: var(--lh-normal);
  letter-spacing: var(--ls-tight);
  color: var(--color-gray-500);
}

.how-it-works__heading {
  font-size: var(--text-3xl);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-tight);
  color: var(--color-dark);
}

/* Columna derecha — position relative para el track */
.how-it-works__right {
  position: relative;
  flex: 0 0 720px;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  overflow: hidden;
}

/* Track: línea vertical desde centro del primer dot al centro del último.
   top y height se asignan por JS una vez calculadas las posiciones de los dots. */
.how-it-works__track {
  position: absolute;
  left: 10px;
  transform: translateX(-50%);
  width: 1px;
  background: linear-gradient(
    to bottom,
    var(--color-accent) var(--hiw-progress, 0%),
    var(--color-gray-400) var(--hiw-progress, 0%)
  );
}

/* Cursor tip — pequeño círculo en el extremo del fill */
.how-it-works__track-cursor {
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  transform: translateX(-50%);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-standard);
  pointer-events: none;
}

.how-it-works__track-cursor.is-moving {
  opacity: 1;
}

/* Step */
.how-it-works__step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

/* Dot — z-index > track para que se superponga a la línea */
.how-it-works__dot {
  position: relative;
  z-index: var(--z-content);
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  margin-top: var(--space-xs);
  background: var(--color-gray-400);
  overflow: hidden;
}

/* Fill verde que emerge desde el centro — no afecta al tamaño del dot */
.how-it-works__dot::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--color-accent);
  transform: scale(0);
  /* Salida suave al hacer scroll up */
  transition: transform var(--duration-fast) var(--ease-standard);
}

/* Entrada con spring al activarse (scroll down) */
.how-it-works__step.is-active .how-it-works__dot::after {
  transform: scale(1);
  transition: transform var(--duration-medium) var(--ease-spring);
}

/* Título */
.how-it-works__title {
  font-size: var(--text-h1);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
  color: var(--color-gray-400);
  transition: color 0.35s var(--ease-standard);
}

.how-it-works__step.is-active .how-it-works__title {
  color: var(--color-dark);
}

/* Body */
.how-it-works__body {
  font-size: var(--text-xl);
  font-weight: var(--fw-regular);
  line-height: var(--lh-relaxed);
  color: var(--color-dark);
  margin-top: 27px;
}

/* Tablet */
@media (max-width: 1200px) {
  .how-it-works {
    padding: var(--section-padding-v) var(--space-xl);
  }

  .how-it-works__inner {
    gap: var(--space-xl);
  }

  .how-it-works__left {
    flex: 0 0 260px;
    top: var(--section-padding-v);
    gap: var(--space-sm);
  }

  .how-it-works__heading {
    font-size: var(--text-h1);
  }

  .how-it-works__right {
    flex: 1;
    gap: var(--space-lg);
  }

  .how-it-works__title {
    font-size: var(--text-h2);
  }

  .how-it-works__body {
    font-size: var(--text-lg);
    margin-top: var(--space-md) - var(--space-2xs);
  }
}

/* Mobile */
@media (max-width: 768px) {
  .how-it-works {
    padding: var(--space-2xl) var(--space-md);
  }

  .how-it-works__inner {
    flex-direction: column;
    gap: var(--space-xl);
  }

  .how-it-works__left {
    position: static;
    flex: none;
  }

  .how-it-works__right {
    flex: none;
    width: 100%;
    gap: var(--space-xl);
  }

  .how-it-works__heading { font-size: var(--text-2xl); }
  .how-it-works__title   { font-size: var(--text-xl); }
  .how-it-works__body    { font-size: var(--text-body); margin-top: 27px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .how-it-works__title { transition: none; }

  .how-it-works__step.is-active .how-it-works__dot::after {
    transform: scale(1);
    transition: none;
  }

  .how-it-works__track-cursor { display: none; }
}