Here's the complete **pillar-nav.css**:

```css


/* Relative body wrapper */

.pillar-body {
  position: relative;
}

/* Section — transparent wrapper, content floats as an island */

.pillar-nav {
  position: sticky;
top: calc(66px + 1.5rem + 5px);
  z-index: 5;
  background: none;
  box-shadow: none;
  transition: .2s ease-in-out;
  pointer-events: none;
}

/* Fixes HS editor overlapping problem */

.hs-inline-edit .pillar-nav {
  z-index: 2147483599;
}

.pillar-nav.section {
  padding: 0;
}

/* Visibility toggle */

.pillar-nav__toggle {
  display: flex;
  position: absolute;
  top: 100%;
right: calc(50% - 775.0px - 50px + 10px);  margin: 0;
  padding: .25rem .5rem;
  background: #fff;
  border: none;
  border-radius: 0 0 5px 5px;
  box-shadow: 0px 8px 16px rgba(0, 41, 18, 0.05), 0px 4px 8px rgba(0, 41, 18, 0.05);
  clip-path: inset(0 -50px -50px -50px);
  color: #002912;
  line-height: 0;
  pointer-events: auto;
  cursor: pointer;
}



.pillar-nav__toggle-chevron {
  transition: .2s ease-in-out;
}

.pillar-nav__toggle:hover .pillar-nav__toggle-chevron {
  transform: scale(1.1);
}

.pillar-nav__toggle-chevron--up {
  padding-bottom: 2px;
}

.pillar-nav__toggle-chevron--down {
  padding-top: 2px;
}

.pillar-nav__toggle-chevron--down,
.pillar-nav--compact .pillar-nav__toggle-chevron--up {
  display: none;
}

.pillar-nav--compact .pillar-nav__toggle-chevron--down {
  display: flex;
}

/* Content wrapper — the visible floating island */

.pillar-nav__content {
  position: relative;
width: calc(1550px + 100px);
  max-width: calc(100% - var(--layout-gutter));
  margin-inline: auto;
  padding: 20px 25px;
  background: #fff;
  border-radius: 36px;
  box-shadow: 0px 16px 32px rgba(0, 41, 18, 0.05), 0px 8px 16px rgba(0, 41, 18, 0.05);
  pointer-events: auto;
}

.pillar-nav--toggle-interactive .pillar-nav__content {
  animation: .2s ease-in-out uiPop;
}

.pillar-nav--compact .pillar-nav__content {
  display: none;
}

/* Overline & title styles */

.pillar-nav__overline {
  display: block;
}

.pillar-nav__title {
  display: block;
}

/* Control column */

.pillar-nav__control {
  position: relative;
  max-width: 50%;
  padding-inline-end: 60px;
  flex-shrink: 0;
}

.pillar-nav__button {
  display: inline-flex;
  align-items: center;
  margin: 0;
  padding: 0;
  background: none;
  border: none;
  border-radius: 0;
  cursor: pointer;
  font-family: inherit;
  font-style: inherit;
  font-weight: inherit;
  text-align: inline-start;
}

.pillar-nav__button-arrow {
  flex-shrink: 0;
  padding-inline-start: 4px;
  line-height: 0;
}

.pillar-nav__button-mobile {
  display: none;
}

.pillar-nav__list {
  position: absolute;
  left: 0;
  top: 100%;
  z-index: 5;
  display: none;
  width: 250px;
  max-height: 70vh;
  overflow-y: auto;
  list-style: none;
  margin: 0;
  padding: 10px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0px 16px 32px rgba(0, 41, 18, 0.05), 0px 8px 16px rgba(0, 41, 18, 0.05);
}



.pillar-nav--list-open .pillar-nav__list {
  display: block;
  animation: .2s ease-in-out forwards uiPop;
}

.pillar-nav__item {
  padding: 10px;
  border-radius: 6px;
  transition: .2s ease-in-out;
}

.pillar-nav__item:hover {
  background: #f1f1f1;
}

.pillar-nav__link,
.pillar-nav__link:hover {
  color: inherit;
  text-decoration: none;
}

/* Display column */

.pillar-nav__display {
  flex: 1;
}

.pillar-nav__progress {
  margin-top: 1rem;
  background: #f1f1f1;
  border-radius: 4px;
  transition: .8s;
}

.pillar-nav__progress-bar {
  width: 20px;
  max-width: 100%;
  height: 4px;
  background: linear-gradient(111.02deg, #00481f 0%, #00652d 100%);
  border-radius: 4px;
}

/* Responsive */

@media (max-width: 1139px) {
  .pillar-nav {
    top: calc(66px + 1.5rem);
  }
}

@media (max-width: 767px) {
  .pillar-nav {
    top: calc(66px + 1.5rem);
  }
}

@media (max-width: 479px) {
  .pillar-nav__content {
    padding-top: 10px;
    padding-bottom: 15px;
  }

  .pillar-nav__progress {
    margin-top: .5rem;
  }

  .pillar-nav__control {
    max-width: 50%;
    padding-inline-end: 20px;
  }

  .pillar-nav__display .pillar-nav__title {
    font-size: 1rem;
  }

  .pillar-nav__button-text,
  .pillar-nav__button-arrow {
    display: none;
  }

  .pillar-nav__button-mobile {
    display: flex;
    flex-shrink: 0;
  }
}
```