.app-outline {
  max-width: 70rem;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--border);
  list-style: none;
}

.app-outline > li {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  gap: 1.5rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
}

.app-outline-number {
  color: var(--brand-primary-strong);
  font-family: Lato, sans-serif;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.8;
}

.app-outline h3 {
  margin: 0 0 .5rem;
  color: var(--brand-ink);
  font-size: clamp(1.3rem, 2vw, 1.6rem);
  font-weight: 700;
  line-height: 1.4;
}

.app-outline ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .5rem 2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.app-outline ul li {
  position: relative;
  padding-left: 1rem;
  color: var(--brand-ink-muted);
  line-height: 1.75;
}

.app-outline ul li::before {
  position: absolute;
  top: .72em;
  left: 0;
  width: .3rem;
  height: .3rem;
  border-radius: 50%;
  background: var(--brand-primary-strong);
  content: "";
}

.app-outline-extension {
  max-width: 70rem;
  margin-top: 2rem;
  padding: 1.25rem 1.5rem;
  border-left: 3px solid var(--brand-primary);
  background: #fff;
}

.app-outline-extension h3 {
  margin: 0 0 .35rem;
  color: var(--brand-ink);
  font-size: 1rem;
  font-weight: 700;
}

.app-outline-extension p {
  margin: 0;
  color: var(--brand-ink-muted);
  line-height: 1.75;
}

@media (max-width: 640px) {
  .app-outline > li {
    grid-template-columns: 2rem minmax(0, 1fr);
    gap: .75rem;
    padding: 1.5rem 0;
  }

  .app-outline ul { grid-template-columns: 1fr; }
}