:root {
  --bg: #fafafa;
  --panel: #ffffff;
  --text: #1a1a1a;
  --muted: #666;
  --border: #e0e0e0;
  --accent: #0b5fff;
  --accent-soft: #e7efff;
  --badge-reducer: #ffe9b3;
  --badge-branched: #d3ffd9;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.topbar h1 { margin: 0; font-size: 20px; }

.unit-toggle label {
  margin-left: 12px;
  font-size: 14px;
  cursor: pointer;
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 20px;
  padding: 20px;
  max-width: 1600px;
  margin: 0 auto;
}

.filters {
  position: sticky;
  top: 20px;
  align-self: start;
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 4px;
}

.field select,
.field input[type=number] {
  width: 100%;
  padding: 6px 8px;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--panel);
}

.field small {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 11px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.chip {
  padding: 4px 10px;
  font-size: 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
}

.chip:hover {
  background: var(--accent-soft);
}

.chip[aria-pressed="true"] {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

#clear-filters {
  width: 100%;
  padding: 8px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
}

#clear-filters:hover {
  background: var(--accent-soft);
}

.results-count {
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
}

.results {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
  cursor: pointer;
  text-align: center;
  transition: border-color 0.1s;
}

.card:hover {
  border-color: var(--accent);
}

.card.low-confidence {
  border-style: dashed;
  opacity: 0.85;
}

.card img {
  width: 100%;
  height: 120px;
  object-fit: contain;
  background: #f0f0f0;
}

.card .part {
  font-weight: 700;
  margin-top: 6px;
}

.card .spec,
.card .shape-label,
.card .type-label {
  color: var(--muted);
  font-size: 12px;
}

.card .badge {
  display: inline-block;
  margin-top: 4px;
  padding: 1px 6px;
  font-size: 10px;
  border-radius: 999px;
}

.card .badge.reducer { background: var(--badge-reducer); }
.card .badge.branched { background: var(--badge-branched); }

.detail {
  position: fixed;
  top: 0;
  right: 0;
  width: 360px;
  height: 100vh;
  background: var(--panel);
  border-left: 1px solid var(--border);
  padding: 48px 20px 20px;
  overflow-y: auto;
  box-shadow: -4px 0 12px rgba(0, 0, 0, 0.08);
  z-index: 10;
}

.detail.hidden {
  display: none;
}

.detail #detail-close {
  position: absolute;
  top: 8px;
  right: 12px;
  font-size: 28px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  line-height: 1;
}

.detail img {
  width: 100%;
  max-height: 240px;
  object-fit: contain;
  background: #f0f0f0;
}

.detail h2 {
  font-size: 18px;
  margin: 12px 0 8px;
}

.detail dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  margin: 0;
  font-size: 13px;
}

.detail dt {
  font-weight: 600;
  color: var(--muted);
}

.detail dd {
  margin: 0;
}

.hint {
  color: var(--muted);
  font-size: 12px;
  margin-top: 12px;
}

.error,
.empty {
  padding: 40px;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 720px) {
  .layout { grid-template-columns: 1fr; }
  .filters { position: static; }
  .detail { width: 100%; }
}