.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  border: 0;
  background: var(--sv-primary);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}
.btn-accent { background: var(--sv-secondary); }
.empty-state { padding: 80px 0; text-align: center; }
.empty-state .sub { color: var(--sv-muted); }

.product-detail { padding: 32px 0 56px; }
.product-detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
}
.product-gallery-main {
  background: var(--sv-surface);
  border-radius: var(--sv-radius-lg);
  padding: 24px;
}
.product-gallery-main img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
}
.product-detail-info h1 {
  margin: 0 0 12px;
  font-family: var(--sv-serif);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 400;
}
.product-detail-info .price {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--sv-accent);
  margin-bottom: 16px;
}
.product-detail-info .price-old {
  color: var(--sv-muted);
  text-decoration: line-through;
  font-size: 1rem;
  margin-right: 8px;
}
.qty-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 20px 0;
}
.qty-row input {
  width: 72px;
  padding: 10px;
  border: 1px solid var(--sv-border);
  border-radius: 12px;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.gs-breadcrumb-bar {
  background: var(--sv-surface);
  border-bottom: 1px solid var(--sv-border);
  padding: 14px 0;
}
.gs-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--sv-muted);
}
.gs-breadcrumb a:hover { color: var(--sv-primary); }

@media (max-width: 768px) {
  .product-detail-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}