.filter-panel { padding: 16px; }
  .filter-panel .check-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .check-list label { font-size: 13px; }
  .tag-list { grid-template-columns: repeat(2, 1fr); }
  .detail-card { padding: 12px; }
  .detail-info h1 { font-size: 30px; line-height: 1.12; }
  .main-preview { height: 300px; }
  .thumb-strip button { height: 58px; }
  .detail-meta { grid-template-columns: 1fr; }
  .cart-layout { gap: 14px; }
  .cart-box, .contact-card { padding: 16px; }
  .cart-item { grid-template-columns: 72px 1fr auto; gap: 10px; align-items: start; }
  .cart-item > strong, .cart-item .qty { grid-column: 2 / -1; }
  .cart-item .remove-btn { grid-column: 3; grid-row: 1; }
  .coupon { grid-template-columns: 1fr; }
  .contact-layout { gap: 14px; }
}

@media (max-width: 420px) {
  .product-grid { grid-template-columns: 1fr; }
  .product-thumb { height: 210px; }
  .section-title { align-items: start; flex-direction: column; }
  .pill-tabs { display: grid; grid-template-columns: repeat(2, 1fr); }
  .pill-tabs button { width: 100%; }
  .filter-panel { padding: 14px; }
  .filter-group { padding: 12px 0; }
}