/* ============================================================
   FOOTER — Rodapé e botão voltar ao topo
   ============================================================ */

.site-footer {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
  padding-block: 40px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-copy {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.footer-socials {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ---- Botão voltar ao topo ---- */
.back-to-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  z-index: var(--z-back-to-top);
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  color: #fff;
  background: var(--gradient-brand);
  box-shadow: 0 8px 22px rgba(109, 40, 168, 0.34);
  opacity: 0;
  transform: translateY(16px) scale(0.9);
  visibility: hidden;
  transition: opacity var(--transition), transform var(--transition),
    visibility var(--transition), box-shadow var(--transition);
}

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

.back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 12px 28px rgba(109, 40, 168, 0.42);
}

.back-to-top .icon {
  width: 22px;
  height: 22px;
}