* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: #222; background: #f7f7f9; }
.muted { color: #888; }
button { cursor: pointer; }

.topbar { display: flex; justify-content: space-between; align-items: center; padding: 16px 24px; background: #fff; border-bottom: 1px solid #eee; }
.topbar h1 { margin: 0; font-size: 20px; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
#refresh-btn, #filter-toggle { border: 1px solid #ddd; background: #fff; padding: 6px 10px; border-radius: 6px; font: inherit; }
#filter-toggle { display: none; }
#filter-toggle.active { background: #d33; color: #fff; border-color: #d33; }

.filterbar { position: sticky; top: 0; z-index: 10; background: #fff; padding: 12px 24px; display: grid; grid-template-columns: repeat(5, 1fr) auto; gap: 12px; border-bottom: 1px solid #eee; }
.filter { display: flex; flex-direction: column; gap: 4px; font-size: 13px; }
.filter label { font-size: 12px; color: #666; }
.filter input, .filter select, .multi-select > button { padding: 8px 10px; border: 1px solid #ddd; border-radius: 6px; background: #fff; font: inherit; }
.multi-select { position: relative; }
.multi-select > button { width: 100%; text-align: left; }
.multi-select .dropdown { position: absolute; top: 100%; left: 0; right: 0; background: #fff; border: 1px solid #ddd; border-radius: 6px; z-index: 20; box-shadow: 0 4px 12px rgba(0,0,0,0.08); display: flex; flex-direction: column; max-height: 320px; overflow: hidden; }
.multi-select .dropdown label { display: flex; gap: 8px; padding: 4px 8px; cursor: pointer; }
.multi-select .dropdown label:hover { background: #f5f5f5; }
.ms-search { padding: 8px; border-bottom: 1px solid #eee; }
.ms-search input { width: 100%; padding: 6px 8px; border: 1px solid #ddd; border-radius: 4px; font: inherit; box-sizing: border-box; }
.ms-list { flex: 1; overflow-y: auto; padding: 6px 0; min-height: 80px; }
.ms-empty { padding: 12px; color: #999; font-size: 12px; font-style: italic; text-align: center; }
.ms-footer { display: flex; gap: 6px; padding: 8px; border-top: 1px solid #eee; background: #fafafa; }
.ms-footer button { flex: 1; padding: 6px 8px; border: 1px solid #ddd; background: #fff; border-radius: 4px; font-size: 12px; cursor: pointer; }
.ms-footer button:hover { background: #f0f0f0; }
#clear-filters { align-self: end; padding: 8px 12px; border: 1px solid #ddd; background: #fff; border-radius: 6px; }

main { padding: 24px; }
main > section { margin-bottom: 32px; }
main > section h2 { font-size: 16px; margin: 0 0 12px; }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 1024px) { .grid { grid-template-columns: repeat(3, 1fr); } .filterbar { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 768px) {
  main { padding: 12px; }
  .grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .topbar { padding: 10px 12px; }
  .topbar h1 { font-size: 16px; }
  #user-info { display: none; }
  #filter-toggle { display: inline-block; }
  .filterbar { grid-template-columns: 1fr 1fr; padding: 10px 12px; gap: 8px; }
  .filterbar #clear-filters { grid-column: 1 / -1; align-self: stretch; }
  .filterbar.collapsed { display: none; }
}
@media (max-width: 480px) {
  .filterbar { grid-template-columns: 1fr; }
  .grid { gap: 8px; }
  .card { padding: 8px; gap: 6px; }
  .card-name { font-size: 12px; min-height: 2.4em; }
  .card-sku, .card-stats { font-size: 10px; }
  .card-price-toggle { font-size: 9px; padding: 4px 5px; }
  .card-price-list { font-size: 8px; padding: 4px 5px; }
  .card-stats { flex-direction: column; gap: 2px; }
}

.card { position: relative; background: #fff; border: 1px solid #ececec; border-radius: 8px; padding: 12px; display: flex; flex-direction: column; gap: 8px; cursor: pointer; transition: box-shadow .15s; }
.card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.08); }
.card-check { position: absolute; top: 12px; left: 12px; }
.card-share { position: absolute; top: 12px; right: 12px; border: none; background: transparent; font-size: 14px; }
.card-thumb { aspect-ratio: 1; background: #f1f1f1; border-radius: 6px; overflow: hidden; display: flex; align-items: center; justify-content: center; }
.card-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card-name { font-size: 13px; font-weight: 500; line-height: 1.3; min-height: 2.6em; }
.card-sku { font-size: 11px; }
.card-price-wrap { position: relative; }
.card-price-toggle { width: 100%; padding: 5px 7px; border: 1px solid #ddd; background: #fff; border-radius: 6px; display: flex; gap: 3px; align-items: center; font-size: 10px; }
.card-price-toggle .chev { margin-left: auto; transition: transform .15s; }
.card.expanded .card-price-toggle .chev { transform: rotate(180deg); }
.card.expanded .card-price-list { display: block; }
.card-price-list { display: none; padding: 5px 7px; border: 1px solid #eee; border-top: none; font-size: 9px; }
.card-price-list > div { display: flex; justify-content: space-between; padding: 2px 0; }
.card-stats { font-size: 11px; display: flex; justify-content: space-between; gap: 8px; }
.card-stock, .card-sold { white-space: nowrap; }

.pagination { display: flex; justify-content: center; gap: 4px; padding: 16px 0; flex-wrap: wrap; overflow-x: auto; }
.pagination button { padding: 6px 10px; border: 1px solid #ddd; background: #fff; border-radius: 4px; font-size: 13px; }
.pagination button.active { background: #d33; color: #fff; border-color: #d33; }
.pagination button:disabled { opacity: 0.4; cursor: default; }

.lightbox { position: fixed; inset: 0; z-index: 100; display: flex; align-items: center; justify-content: center; }
.lightbox-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.7); }
.lightbox-dialog { position: relative; background: #fff; border-radius: 12px; padding: 24px; max-width: 900px; width: 90%; max-height: 90vh; overflow-y: auto; display: grid; grid-template-columns: 2fr 1fr; gap: 16px; grid-template-areas: "photo meta" "strip strip"; }
@media (max-width: 768px) {
  .lightbox-dialog { padding: 16px; width: 95%; grid-template-columns: 1fr; grid-template-areas: "photo" "meta" "strip"; }
  .lightbox-photo { aspect-ratio: 4/3; }
  .lightbox-strip img { width: 48px; height: 48px; }
}
.lightbox-close { position: absolute; top: 8px; right: 8px; width: 32px; height: 32px; border: none; background: rgba(0,0,0,0.6); color: #fff; font-size: 20px; line-height: 1; cursor: pointer; border-radius: 50%; z-index: 10; display: flex; align-items: center; justify-content: center; padding: 0; }
.lightbox-close:hover { background: #d33; }
.lightbox-photo { grid-area: photo; position: relative; background: #f4f4f4; border-radius: 8px; overflow: hidden; aspect-ratio: 1; }
.lightbox-photo img { width: 100%; height: 100%; object-fit: contain; }
.lightbox-prev, .lightbox-next { position: absolute; top: 50%; transform: translateY(-50%); border: none; background: rgba(0,0,0,0.4); color: #fff; padding: 8px 12px; border-radius: 4px; font-size: 16px; }
.lightbox-prev { left: 8px; } .lightbox-next { right: 8px; }
.lightbox-meta { grid-area: meta; }
.lightbox-meta dl { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; font-size: 13px; }
.lightbox-meta dt { color: #777; }
.lightbox-meta dd { margin: 0; }
.lightbox-strip { grid-area: strip; display: flex; gap: 8px; overflow-x: auto; padding-top: 8px; border-top: 1px solid #eee; }
.lightbox-strip img { width: 60px; height: 60px; object-fit: cover; border-radius: 4px; cursor: pointer; opacity: 0.7; }
.lightbox-strip img.active { opacity: 1; outline: 2px solid #d33; }

#toast { position: fixed; bottom: 24px; right: 24px; z-index: 200; }
#toast .toast-item { background: #333; color: #fff; padding: 12px 16px; border-radius: 6px; margin-top: 8px; font-size: 13px; }

footer { padding: 24px; text-align: center; color: #999; font-size: 12px; }

@keyframes shimmer { 0% { background-position: -400px 0; } 100% { background-position: 400px 0; } }
.skeleton { background: linear-gradient(90deg, #f0f0f0 0%, #f8f8f8 50%, #f0f0f0 100%); background-size: 800px 100%; animation: shimmer 1.4s infinite linear; min-height: 280px; border-radius: 8px; }