:root {
  --blue: #1a4b8c;
  --blue-dark: #0f3566;
  --bg: #f4f6f9;
  --panel: #ffffff;
  --border: #dde3ea;
  --text: #1c2530;
  --text-muted: #6b7688;
  --radius: 8px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

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

/* Header */
.topbar {
  background: linear-gradient(135deg, var(--blue-dark), var(--blue));
  color: #fff;
}

.topbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.brand-logo {
  color: #fff;
  font-weight: 700;
  font-size: 17px;
}
.brand-logo:hover { text-decoration: none; opacity: 0.9; }

.topnav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13.5px;
}

.topnav a {
  color: #dce6f5;
}
.topnav a:hover { color: #fff; text-decoration: none; }

.topnav-search {
  margin-left: auto;
  font-weight: 600;
  color: #fff !important;
}

/* Breadcrumbs */
.breadcrumbs-wrap {
  background: #eef2f7;
  border-bottom: 1px solid var(--border);
}

.breadcrumbs {
  max-width: 1200px;
  margin: 0 auto;
  padding: 8px 20px;
  font-size: 12.5px;
  color: var(--text-muted);
}

.breadcrumbs a { color: var(--text-muted); }
.breadcrumbs .sep { margin: 0 6px; }

/* Page */
.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.page-h1 {
  font-size: 24px;
  margin: 0 0 14px;
}

.section-h2 {
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--text-muted);
  margin: 32px 0 12px;
}

.intro-text {
  color: var(--text);
  line-height: 1.6;
  max-width: 850px;
}

.muted { color: var(--text-muted); }

/* Catalog pages (type / brand / model): left sidebar + main content */
.catalog-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 20px;
  align-items: start;
}

.catalog-sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: sticky;
  top: 16px;
}

.diagram-sidebar {
  padding: 10px;
  text-align: center;
}
.diagram-sidebar img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
}

.catalog-main { min-width: 0; }

.size-filter-form .btn-apply {
  width: 100%;
  margin-top: 10px;
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}
.size-filter-form .btn-apply:hover { opacity: 0.92; }

.btn-reset-link {
  display: block;
  text-align: center;
  margin-top: 8px;
  font-size: 12.5px;
  color: var(--text-muted);
}

/* Home product grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  margin: 20px 0;
}

.product-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: block;
}
.product-card:hover { border-color: var(--blue); text-decoration: none; }

.product-card-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.product-card-count {
  font-size: 13px;
  color: var(--text-muted);
}

/* Chip grid (brands / models) */
.chip-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.chip-link {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--text);
}
.chip-link:hover { border-color: var(--blue); color: var(--blue); text-decoration: none; }

.chip-count {
  color: var(--text-muted);
  font-size: 12px;
}

/* Data table */
.table-wrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.data-table thead th {
  text-align: left;
  padding: 10px 12px;
  background: #eef2f7;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-weight: 600;
  white-space: nowrap;
}

.data-table tbody td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.data-table tbody tr {
  cursor: pointer;
}
.data-table tbody tr:hover {
  background: #f0f5fb;
}

.data-table .ref-cell {
  font-weight: 600;
}
.data-table .ref-cell a { color: var(--blue); }

.empty-row td {
  text-align: center;
  color: var(--text-muted);
  padding: 30px;
  cursor: default;
}

.app-table td, .app-table th {
  white-space: normal;
}

/* Pager */
.pager {
  display: flex;
  gap: 6px;
  align-items: center;
  justify-content: flex-end;
  margin: 10px 0;
}

.pager button {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text);
}
.pager button:disabled { opacity: 0.4; cursor: default; }
.pager button:not(:disabled):hover { border-color: var(--blue); color: var(--blue); }
.pager a { display: inline-flex; }

.pageinfo {
  font-size: 13px;
  color: var(--text-muted);
  margin: 0 6px;
}

/* Part detail page */
.product-badge {
  display: inline-block;
  background: #eef2f7;
  color: var(--blue-dark);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}

.part-hero {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  flex-wrap: wrap;
  margin: 6px 0 24px;
}

.diagram {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px;
  flex: 0 0 auto;
}

.diagram img {
  display: block;
  max-width: 280px;
  width: 100%;
  height: auto;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 10px;
  flex: 1 1 320px;
  align-content: flex-start;
  margin: 0;
  max-width: 700px;
}

.spec-tile {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  text-align: center;
}
.spec-tile .k { font-size: 11px; color: var(--text-muted); text-transform: uppercase; }
.spec-tile .v { font-size: 16px; font-weight: 700; margin-top: 2px; }

.xref-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.xref-chip {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 4px 8px;
  font-size: 12.5px;
  font-family: "SFMono-Regular", Consolas, monospace;
}

/* Search page */
.search-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 20px;
}

.filters { display: flex; flex-direction: column; gap: 16px; }

.filter-block {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.filter-block h2 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin: 0 0 10px;
}

.filter-block label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12.5px;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.filter-block label:last-child { margin-bottom: 0; }

input[type=text], input[type=number], select {
  font-size: 14px;
  padding: 7px 9px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
  font-family: inherit;
}
input:focus, select:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(26,75,140,0.12);
}

.size-grid {
  display: grid;
  grid-template-columns: 24px 1fr 1fr;
  gap: 6px 8px;
  align-items: center;
}
.size-grid .size-label { font-weight: 600; color: var(--text); font-size: 13px; }
.size-grid input { width: 100%; padding: 5px 7px; }

.btn-reset {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 9px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
}
.btn-reset:hover { border-color: var(--blue); color: var(--blue); }

.results-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 13px;
  color: var(--text-muted);
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  background: var(--panel);
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 18px 20px;
  font-size: 12.5px;
  color: var(--text-muted);
}

@media (max-width: 860px) {
  .search-layout { grid-template-columns: 1fr; }
  .catalog-layout { grid-template-columns: 1fr; }
  .catalog-sidebar { position: static; }
}