:root {
  --bg: #0b0d12;
  --bg-elev: #11151c;
  --bg-card: #151b25;
  --bg-row: #161c27;
  --bg-row-alt: #131825;
  --bg-row-hover: #1c2333;
  --border: #1e2632;
  --border-strong: #2a3445;
  --text: #e7ecf2;
  --text-dim: #9aa6b6;
  --text-muted: #6a7585;
  --accent: #f5b14a;
  --accent-soft: rgba(245, 177, 74, 0.15);
  --serta-band: #34d39940;
  --good: #34d399;
  --bad: #f87171;
  --warn: #fbbf24;
  --link: #7dd3fc;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: radial-gradient(circle at top, #1a1f2c, var(--bg) 60%);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 14px;
  min-height: 100vh;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- topbar ---------- */
.topbar {
  border-bottom: 1px solid var(--border);
  background: rgba(11, 13, 18, 0.85);
  backdrop-filter: blur(8px);
  position: sticky; top: 0; z-index: 5;
}
.topbar-inner {
  max-width: 1600px; margin: 0 auto;
  padding: 16px 28px;
  display: flex; justify-content: space-between; align-items: center;
}
.brand { display: flex; align-items: center; gap: 16px; }
.brand-mark {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent) 0%, #f97316 100%);
  color: #1a1207;
  font-weight: 800; letter-spacing: 0.04em;
  display: grid; place-items: center;
  font-size: 13px;
}
.brand-text h1 {
  margin: 0; font-size: 18px; font-weight: 600; letter-spacing: -0.01em;
}
.subtitle { margin: 2px 0 0; font-size: 12px; color: var(--text-dim); }
.brand-meta { display: flex; gap: 8px; align-items: center; }

.chip {
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
.chip-link { color: var(--link); }

/* ---------- stat grid ---------- */
.stat-grid {
  max-width: 1600px; margin: 32px auto 0;
  padding: 0 28px;
  display: grid; gap: 16px;
  grid-template-columns: repeat(4, 1fr);
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  position: relative; overflow: hidden;
}
.stat-card::after {
  content: ''; position: absolute;
  top: 0; right: 0; width: 80px; height: 80px;
  background: radial-gradient(circle at top right, var(--accent-soft), transparent 60%);
}
.stat-label {
  font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--text-muted);
}
.stat-value {
  margin-top: 6px;
  font-size: 28px; font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
.stat-skel .stat-value { color: var(--text-muted); }

/* ---------- retailer strip ---------- */
.retailer-strip {
  max-width: 1600px; margin: 28px auto 0;
  padding: 0 28px;
  display: flex; gap: 12px; flex-wrap: wrap;
}
.retailer-card {
  flex: 1 1 220px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  display: flex; flex-direction: column; gap: 4px;
}
.retailer-name {
  font-weight: 600; font-size: 14px;
  display: flex; justify-content: space-between; align-items: center;
}
.retailer-name .pill {
  font-size: 10px; padding: 2px 7px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.05em;
}
.retailer-stats {
  font-size: 12px; color: var(--text-dim);
  display: flex; gap: 12px;
  font-variant-numeric: tabular-nums;
}
.retailer-stats span { display: inline-flex; align-items: center; gap: 4px; }
.retailer-stats b { color: var(--text); font-weight: 500; }

/* ---------- controls ---------- */
.controls {
  max-width: 1600px; margin: 28px auto 12px;
  padding: 0 28px;
}
.controls-row {
  display: flex; gap: 16px; flex-wrap: wrap;
  align-items: center;
}
.search {
  flex: 1 1 300px; min-width: 260px;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
}
.search:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.filter-pills { display: flex; gap: 6px; flex-wrap: wrap; }
.filter-pill {
  padding: 6px 12px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 999px; cursor: pointer;
  color: var(--text-dim); font-size: 12px;
  transition: all 120ms ease;
}
.filter-pill:hover { color: var(--text); border-color: var(--border-strong); }
.filter-pill.active {
  background: var(--accent-soft); border-color: var(--accent);
  color: var(--accent);
}
.toggle {
  display: flex; align-items: center; gap: 8px;
  font-size: 12px; color: var(--text-dim);
  cursor: pointer; user-select: none;
}
.toggle input { accent-color: var(--accent); }

/* ---------- product list ---------- */
.product-list {
  max-width: 1600px; margin: 0 auto 64px;
  padding: 0 28px;
  display: flex; flex-direction: column; gap: 12px;
}
.loading {
  text-align: center; color: var(--text-muted);
  padding: 40px 0; font-size: 14px;
}
.empty {
  text-align: center; padding: 40px;
  background: var(--bg-card);
  border: 1px dashed var(--border-strong);
  border-radius: 12px;
  color: var(--text-dim);
}

/* ---------- product card ---------- */
.product-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.product-header {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 16px; align-items: center;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 120ms;
}
.product-header:hover { background: var(--bg-row-hover); }
.product-thumb {
  width: 64px; height: 64px; border-radius: 8px;
  background: var(--bg); object-fit: cover;
  border: 1px solid var(--border);
}
.product-thumb.placeholder {
  display: grid; place-items: center;
  color: var(--text-muted); font-size: 11px;
}
.product-meta { min-width: 0; }
.product-title {
  font-size: 16px; font-weight: 600;
  margin: 0 0 4px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.product-sub {
  font-size: 12px; color: var(--text-dim);
  display: flex; gap: 12px;
  font-variant-numeric: tabular-nums;
}
.product-sub .vendor-tag {
  padding: 2px 8px; border-radius: 4px;
  background: var(--bg-elev); color: var(--text);
  font-size: 11px;
}
.product-sub .vendor-tag.catalog { background: #16302a; color: #34d399; }
.product-sub .vendor-tag.canada { background: #2a1f3c; color: #c084fc; }

.product-actions { display: flex; gap: 6px; align-items: center; }
.expand-arrow {
  width: 28px; height: 28px;
  border-radius: 6px; border: 1px solid var(--border);
  display: grid; place-items: center;
  color: var(--text-dim); font-size: 12px;
  transition: transform 200ms;
}
.product-card.expanded .expand-arrow { transform: rotate(180deg); }
.match-count {
  padding: 4px 10px; border-radius: 999px;
  background: rgba(52, 211, 153, 0.12);
  color: var(--good);
  font-size: 11px; font-weight: 500;
}
.match-count.zero {
  background: var(--bg-elev); color: var(--text-muted);
}

/* ---------- variant table ---------- */
.variant-table-wrap {
  display: none;
  overflow-x: auto;
}
.product-card.expanded .variant-table-wrap { display: block; }
.variant-table {
  width: 100%; border-collapse: collapse;
  font-size: 13px;
}
.variant-table th, .variant-table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.variant-table th {
  font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  background: var(--bg-elev);
  font-weight: 500;
  position: sticky; top: 0;
}
.variant-table th.serta-col, .variant-table td.serta-col {
  background: rgba(52, 211, 153, 0.04);
  border-left: 2px solid var(--serta-band);
}
.variant-table tbody tr:hover { background: var(--bg-row-hover); }

.size-cell {
  font-weight: 600;
  color: var(--text);
}
.firmness-cell { color: var(--text-dim); font-size: 12px; }

.price-cell {
  display: flex; flex-direction: column; gap: 2px;
  min-width: 100px;
}
.price-cell .sale {
  font-size: 14px; font-weight: 600; color: var(--text);
}
.price-cell .list {
  font-size: 11px; color: var(--text-muted);
  text-decoration: line-through;
}
.price-cell .pct {
  font-size: 10px; color: var(--good); font-weight: 600;
}
.price-cell .empty {
  color: var(--text-muted); font-size: 13px; padding: 0;
  background: none; border: none;
}
.price-cell .delta-up { color: var(--bad); font-size: 11px; }
.price-cell .delta-down { color: var(--good); font-size: 11px; }
.price-cell .delta-flat { color: var(--text-muted); font-size: 11px; }

.compare-cell {
  display: flex; flex-direction: column; gap: 2px;
  min-width: 140px;
  font-variant-numeric: tabular-nums;
}
.compare-cell .empty { color: var(--text-muted); }
.cmp-amount { font-weight: 600; font-size: 14px; }
.cmp-label { font-size: 11px; }
.cmp-good { color: var(--good); }   /* retailer above Serta — Serta wins */
.cmp-bad  { color: var(--bad); }    /* retailer undercuts Serta */
.cmp-flat { color: var(--text-muted); font-size: 12px; }

.retailer-cell-link {
  display: inline-flex; gap: 4px;
  font-size: 10px; color: var(--text-muted);
  margin-top: 2px;
}
.retailer-cell-link:hover { color: var(--link); }
.confidence {
  font-size: 10px; color: var(--text-muted);
}

.multi-price-cell {
  display: flex; flex-direction: column; gap: 6px;
  min-width: 180px;
}
.range-line {
  font-weight: 600; font-size: 13px;
  display: flex; gap: 8px; align-items: baseline;
}
.range-count {
  font-size: 10px; color: var(--text-muted);
  font-weight: 400; text-transform: uppercase; letter-spacing: 0.05em;
}
.sku-list {
  display: flex; gap: 4px; flex-wrap: wrap;
}
.sku-chip {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 7px;
  font-size: 11px;
  color: var(--text);
  text-decoration: none;
  font-variant-numeric: tabular-nums;
  display: inline-flex; gap: 4px; align-items: center;
}
.sku-chip:hover {
  background: var(--bg-row-hover);
  border-color: var(--accent);
  color: var(--accent);
}
.sku-chip .pct {
  color: var(--good); font-size: 10px; font-weight: 600;
}
.sku-chip.verified { border-color: rgba(52, 211, 153, 0.4); }
.sku-chip.fuzzy    { border-color: rgba(251, 191, 36, 0.35); border-style: dashed; }
.sku-badge {
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 9px; font-weight: 700;
  padding: 0 4px; border-radius: 3px;
  letter-spacing: 0.04em;
}
.sku-badge.ok    { background: rgba(52, 211, 153, 0.18); color: var(--good); }
.sku-badge.approx{ background: rgba(251, 191, 36, 0.18); color: var(--warn); }

footer {
  text-align: center; padding: 32px 16px 48px;
  font-size: 11px; color: var(--text-muted);
}

@media (max-width: 900px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .topbar-inner { padding: 12px 16px; }
  .product-list, .controls, .stat-grid, .retailer-strip { padding-left: 16px; padding-right: 16px; }
  .product-title { font-size: 14px; }
}