.product-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 16px max(4vw, 22px);
  font-size: 13px;
  background: #0c1b2a;
  color: #9fb0c1;
}
.product-breadcrumb a { color: #d1e8f8; text-decoration: underline; text-underline-offset: 4px; }
.product-breadcrumb a:focus-visible { outline: 2px solid #78baff; outline-offset: 4px; }
.back-to-top {
  position: fixed;
  right: clamp(16px, 2.2vw, 32px);
  bottom: clamp(18px, 3vw, 36px);
  z-index: 40;
  display: grid;
  min-width: 112px;
  height: 52px;
  padding: 0 18px;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  background: #1677d2;
  color: #fff;
  box-shadow: 0 12px 32px rgba(3, 18, 34, 0.28);
  cursor: pointer;
  font: 700 14px/1 system-ui, sans-serif;
  letter-spacing: 0.02em;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease, background-color 180ms ease;
}

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

.back-to-top:hover {
  background: #0d5da8;
}

.back-to-top:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 3px;
}

@media (max-width: 640px) {
  .back-to-top {
    min-width: 104px;
    height: 46px;
    padding: 0 15px;
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .back-to-top {
    transition: none;
  }
}