.section-heading {
  margin-bottom: 42px;
}

.collection-title {
  max-width: 780px;
}

.collection-intro {
  max-width: 690px;
  color: #a5acb8;
  line-height: 1.75;
  margin: 24px 0 0;
}

.about {
  grid-template-columns: 0.42fr 1.58fr;
}

.about > div {
  grid-template-columns: 1.08fr 0.92fr;
}

.about-copy p {
  color: #a5acb8;
  line-height: 1.9;
  margin: 8px 0 22px;
}

@media (max-width: 900px) {
  .about,
  .about > div {
    grid-template-columns: 1fr;
  }
}

.back-to-top {
  position: fixed;
  right: clamp(18px, 3vw, 42px);
  bottom: clamp(18px, 3vw, 42px);
  z-index: 30;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(215, 255, 87, 0.45);
  border-radius: 50%;
  background: rgba(17, 21, 29, 0.92);
  color: var(--accent);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.4);
  font-size: 1.45rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s,
    background 0.2s;
  backdrop-filter: blur(8px);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background: var(--accent);
  color: #0c0f0e;
  outline: none;
}