:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #1f2530;
  --muted: #5d6676;
  --line: #d9dde4;
  --accent: #1d5fbf;
  --warn: #9b2c2c;
  --demo: #8a5a00;
  --demo-bg: #fff4d6;
  --sel: #e0362c;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font:
    15px/1.45 system-ui,
    sans-serif;
  color: var(--ink);
  background: var(--bg);
}
header,
main,
footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}
h1 {
  font-size: 1.4rem;
  margin: 16px 0;
}
h2 {
  font-size: 1.15rem;
  margin: 0 0 8px;
}
h3 {
  font-size: 1rem;
  margin: 12px 0 6px;
}
h4 {
  font-size: 0.95rem;
  margin: 10px 0 4px;
}
.muted {
  color: var(--muted);
}
.warn {
  color: var(--warn);
}
.demo-banner {
  background: var(--demo-bg);
  color: var(--demo);
  border-bottom: 1px solid #f0d58c;
  padding: 8px 16px;
  font-weight: 600;
  text-align: center;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  margin: 0 0 16px;
}
.row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: end;
}
label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.85rem;
  color: var(--muted);
}
select,
input,
textarea,
button {
  font: inherit;
  padding: 6px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
}
button {
  cursor: pointer;
}
button:hover {
  border-color: var(--accent);
}
button:focus-visible,
select:focus-visible,
input:focus-visible,
.viewer:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}
ul {
  padding-left: 20px;
  margin: 4px 0;
}
.groups {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.diagram-link {
  margin: 4px 8px 4px 0;
}
.badge {
  display: inline-block;
  font-size: 0.75rem;
  padding: 1px 6px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #f0f2f5;
  color: var(--muted);
  vertical-align: middle;
}
.badge.demo {
  background: var(--demo-bg);
  color: var(--demo);
  border-color: #f0d58c;
  font-weight: 700;
}
.status-confirmed,
.status-verified {
  background: #e3f4e8;
  color: #1e6b36;
  border-color: #b8e0c4;
}
.status-unverified,
.status-unknown,
.status-probable {
  background: #fdf1e3;
  color: #8a4b00;
  border-color: #f3d2a6;
}
.status-conflicting,
.status-incompatible,
.status-rejected {
  background: #fbe5e5;
  color: var(--warn);
  border-color: #f0bcbc;
}
code {
  font-family: ui-monospace, monospace;
  background: #f0f2f5;
  padding: 0 4px;
  border-radius: 4px;
}
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}
.viewer-body {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(200px, 1fr);
  gap: 16px;
}
#diagram-svg {
  width: 100%;
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfcfd;
  touch-action: none;
  cursor: grab;
}
.callout circle {
  fill: #fff;
  stroke: var(--accent);
  stroke-width: 3;
}
.callout text {
  font:
    700 14px system-ui,
    sans-serif;
  fill: var(--accent);
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
}
.callout {
  cursor: pointer;
}
.callout.no-part circle {
  stroke: var(--muted);
  stroke-dasharray: 4 3;
}
.callout.no-part text {
  fill: var(--muted);
}
.callout:focus {
  outline: none;
}
.callout:focus circle {
  stroke-width: 5;
}
.callout.selected circle {
  fill: var(--sel);
  stroke: var(--sel);
}
.callout.selected text {
  fill: #fff;
}
.callout-list {
  padding-left: 0;
  list-style: none;
}
.callout-list button {
  width: 100%;
  text-align: left;
  margin: 2px 0;
}
.callout-list button.selected {
  border-color: var(--sel);
  background: #fdeceb;
  font-weight: 600;
}
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.9rem;
}
th,
td {
  text-align: left;
  border-bottom: 1px solid var(--line);
  padding: 4px 6px;
  vertical-align: top;
}
footer {
  padding: 16px;
}
@media (max-width: 720px) {
  .viewer-body {
    grid-template-columns: 1fr;
  }
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
  margin: 10px 0;
}
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 8px;
}
.stat {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px;
}
.stat b {
  display: block;
  font-size: 1.3rem;
}
[hidden] {
  display: none !important;
}
/* M4b catalog experience */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 16px;
}
.brand {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--ink);
  text-decoration: none;
}
.searchbar {
  display: flex;
  gap: 6px;
  flex: 1 1 360px;
  max-width: 640px;
}
.searchbar input {
  flex: 1;
  min-width: 0;
}
#breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 0;
  margin: 8px 0 12px;
  font-size: 0.9rem;
}
#breadcrumbs li + li::before {
  content: '›';
  margin: 0 6px;
  color: var(--muted);
}
#breadcrumbs a {
  color: var(--accent);
}
.cards {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
}
.card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  height: 100%;
}
.card:hover,
.card:focus-visible {
  border-color: var(--accent);
}
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin-bottom: 12px;
}
.step {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
}
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.chip {
  display: inline-flex;
  gap: 4px;
  align-items: center;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  text-decoration: none;
  background: #fff;
  font-size: 0.9rem;
}
.chip.on {
  border-color: var(--accent);
  background: #e8f0fc;
  font-weight: 600;
}
.pager {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-top: 10px;
}
.results {
  list-style: none;
  padding: 0;
}
.result {
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.related {
  font-size: 0.9rem;
  margin-top: 4px;
  padding-left: 12px;
  border-left: 3px solid var(--line);
}
.table-wrap {
  overflow-x: auto;
}
.empty {
  padding: 8px 0;
}
.loading {
  padding: 16px 0;
}
.part-panel {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  padding-top: 8px;
}
@media (max-width: 600px) {
  .searchbar {
    flex-wrap: wrap;
  }
  .searchbar input {
    flex: 1 1 100%;
  }
  .searchbar select,
  .searchbar button {
    flex: 1;
  }
  table.parts thead {
    display: none;
  }
  table.parts tr {
    display: block;
    border-bottom: 1px solid var(--line);
    padding: 6px 0;
  }
  table.parts td {
    display: block;
    border: 0;
    padding: 2px 0;
  }
}
.dgm-canvas {
  width: 100%;
  max-width: 800px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfcfd;
  cursor: crosshair;
  display: block;
  margin: 8px 0;
}
.dgm-canvas circle {
  fill: #fff;
  stroke: var(--sel);
  stroke-width: 3;
}
.dgm-canvas text {
  font:
    700 13px system-ui,
    sans-serif;
  fill: var(--sel);
  text-anchor: middle;
  dominant-baseline: central;
  pointer-events: none;
}