.bio-footer {
  width: 100%;
  margin: 72px 0 0;
  background: #073d35;
  color: rgba(255,255,255,.78);
}

.bio-footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  padding-block: 72px 58px;
}

.footer-brand {
  display: inline-flex;
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 18px;
}

.bio-footer-brand-block p {
  max-width: 320px;
  margin: 0;
  line-height: 1.75;
}

.bio-footer-col h4 {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--primary-fixed);
  margin: 0 0 18px;
}

.bio-footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.bio-footer-col a {
  color: rgba(255,255,255,.78);
  transition: color .2s;
}

.bio-footer-col a:hover {
  color: var(--white);
}

.bio-footer-col p {
  margin: 0 0 8px;
}

.bio-footer-bottom {
  border-top: 1px solid rgba(255,255,255,.14);
  padding-block: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: rgba(255,255,255,.62);
  font-size: 14px;
}

@media (max-width: 900px) {
  .bio-footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .bio-footer-grid {
    grid-template-columns: 1fr;
    padding-block: 52px 42px;
  }

  .bio-footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
  }
}

/* ---- Back to Top Button ---- */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: var(--r-full);
  background: var(--primary);
  color: var(--white, #ffffff);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 99;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .3s, visibility .3s, transform .3s, background .2s, color .2s;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.back-to-top:hover {
  background: var(--gold);
  color: #3a2f00;
  transform: translateY(0) scale(1.08);
}

.back-to-top:active {
  transform: translateY(0) scale(0.95);
}

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