.site-header nav {
  gap: clamp(0.8rem, 1.8vw, 1.6rem);
}

.catalog-hero,
.vessel-hero,
.sonar-detail-hero {
  padding: clamp(5rem, 10vw, 9rem) 0 clamp(3rem, 6vw, 5rem);
}

.catalog-hero {
  max-width: 58rem;
}

.catalog-hero h1,
.vessel-hero h1,
.sonar-detail-hero h1 {
  max-width: 15ch;
  margin: 0.35rem 0 1.5rem;
  font-size: clamp(3.25rem, 8vw, 7rem);
  line-height: 0.92;
  letter-spacing: -0.07em;
}

.catalog-hero h1 span {
  color: var(--seafoam);
}

.catalog-lede,
.vessel-summary {
  max-width: 48rem;
  color: var(--slate);
  font-size: clamp(1rem, 2vw, 1.2rem);
}

.coverage-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: clamp(5rem, 9vw, 8rem);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--panel-soft);
}

.coverage-strip > div {
  display: grid;
  gap: 0.25rem;
  min-height: 7rem;
  padding: 1.5rem;
  align-content: center;
  border-right: 1px solid var(--line);
}

.coverage-strip span,
.fleet-card-meta,
.snapshot-disclosure span,
.fact-grid span,
.source-citation > span,
.installation-list article > div > span,
.unit-list article > span,
.variant-grid article > span {
  color: var(--slate);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.coverage-strip strong {
  font-size: 1.35rem;
}

.coverage-strip details {
  grid-column: 1 / -1;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--slate);
}

.coverage-strip summary {
  color: var(--mist);
  cursor: pointer;
  font-weight: 700;
}

.coverage-strip ul {
  margin: 1rem 0 0;
  padding-left: 1.25rem;
}

.fleet-catalog,
.sonar-catalog,
.installation-section,
.units-section,
.variant-section,
.matrix-section {
  padding-bottom: clamp(5rem, 9vw, 8rem);
}

.catalog-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.65fr);
  gap: 2rem;
  align-items: end;
  margin-bottom: 2rem;
}

.catalog-heading h2,
.vessel-dossier-header h2 {
  margin: 0.25rem 0 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.catalog-heading > p {
  margin: 0;
  color: var(--slate);
}

.catalog-layout {
  display: grid;
  grid-template-columns: minmax(13.5rem, 0.23fr) minmax(0, 0.77fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: start;
}

.catalog-filters {
  position: sticky;
  top: 1rem;
  display: grid;
  gap: 0.55rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: rgba(7, 28, 43, 0.94);
}

.catalog-filters label,
.catalog-search span {
  margin-top: 0.45rem;
  color: var(--slate);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.catalog-filters input,
.catalog-filters select,
.catalog-search input {
  width: 100%;
  min-height: 2.75rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  outline: none;
  background: var(--depth);
  color: var(--mist);
}

.catalog-filters input:focus-visible,
.catalog-filters select:focus-visible,
.catalog-search input:focus-visible {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(28, 200, 229, 0.15);
}

.clear-filters,
.comparison-panel button {
  min-height: 2.6rem;
  margin-top: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  background: transparent;
  color: var(--mist);
  font-weight: 700;
}

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

.fleet-card-grid,
.sonar-system-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.fleet-card,
.sonar-system-grid > article,
.variant-grid > article,
.capability-grid > article {
  display: grid;
  gap: 0.75rem;
  align-content: start;
  min-width: 0;
  padding: clamp(1.2rem, 2.5vw, 1.75rem);
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: linear-gradient(145deg, rgba(12, 46, 66, 0.72), rgba(6, 26, 43, 0.82));
}

.fleet-card-meta {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
}

.fleet-card h3,
.sonar-system-grid h3,
.variant-grid h3,
.installation-list h3,
.unit-list h3,
.source-citation h3 {
  margin: 0;
  line-height: 1.15;
}

.fleet-card h3 {
  font-size: clamp(1.4rem, 2.6vw, 1.8rem);
}

.fleet-card h3 a,
.sonar-system-grid h3 a,
.installation-list h3 a,
.matrix-row a {
  text-decoration-color: rgba(110, 231, 200, 0.35);
  text-underline-offset: 0.2em;
}

.fleet-card p,
.sonar-system-grid p,
.variant-grid p,
.capability-grid p,
.capability-grid ul {
  margin: 0;
  color: var(--slate);
}

.fleet-operator,
.manufacturer,
.native-name {
  color: var(--seafoam) !important;
  font-size: 0.84rem;
  font-weight: 700;
}

.role-tags,
.record-badges,
.system-token-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.role-tags span,
.record-badges span,
.system-token-row span {
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--slate);
  font-size: 0.7rem;
  font-weight: 700;
}

.role-tags .visual-aid-badge {
  border-color: rgba(110, 231, 200, 0.4);
  color: var(--seafoam);
}

.evidence-grade {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  font-weight: 800;
}

.grade-a {
  color: var(--seafoam) !important;
}

.grade-b {
  color: var(--cyan) !important;
}

.grade-c {
  color: #f2c46d !important;
}

.grade-d {
  color: #dc7e73 !important;
}

.fleet-card-footer,
.sonar-system-grid footer {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
  color: var(--slate);
  font-size: 0.75rem;
}

.fleet-card-footer label {
  display: flex;
  gap: 0.35rem;
  align-items: center;
  color: var(--mist);
  cursor: pointer;
  font-weight: 700;
}

.fleet-card-footer input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--cyan);
}

.comparison-panel {
  margin-bottom: 1rem;
  padding: 1.25rem;
  border: 1px solid rgba(110, 231, 200, 0.38);
  border-radius: 0.9rem;
  background: rgba(110, 231, 200, 0.055);
}

.comparison-panel > header {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.comparison-panel h3 {
  margin: 0.2rem 0 0;
}

.comparison-panel button {
  min-width: 5rem;
  margin: 0;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.comparison-grid article {
  min-width: 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 0.7rem;
  background: var(--abyss);
}

.comparison-grid article > span {
  color: var(--slate);
  font-size: 0.7rem;
  text-transform: uppercase;
}

.comparison-grid h4 {
  margin: 0.35rem 0 0.85rem;
}

.comparison-grid dl {
  display: grid;
  gap: 0.45rem;
  margin: 0 0 1rem;
}

.comparison-grid dl div {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 0.5rem;
  padding-top: 0.45rem;
  border-top: 1px solid var(--line);
  font-size: 0.74rem;
}

.comparison-grid dt {
  color: var(--slate);
}

.comparison-grid dd {
  margin: 0;
}

.comparison-grid a {
  color: var(--seafoam);
  font-size: 0.76rem;
  font-weight: 700;
}

.comparison-note {
  margin: 0.85rem 0 0;
  color: var(--slate);
  font-size: 0.76rem;
}

.catalog-empty {
  display: grid;
  min-height: 16rem;
  margin-top: 1rem;
  place-items: center;
  align-content: center;
  padding: 2rem;
  border: 1px dashed var(--line);
  border-radius: 0.9rem;
  text-align: center;
}

.catalog-empty h3,
.catalog-empty p {
  margin: 0.35rem 0;
}

.catalog-search {
  display: grid;
  gap: 0.45rem;
}

.sonar-system-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.sonar-system-grid > article {
  min-height: 22rem;
}

.vessel-detail-page {
  padding-inline: clamp(0.75rem, 2.5vw, 2.5rem);
}

.vessel-detail-page > .installation-section,
.vessel-detail-page > .units-section,
.vessel-detail-page > .record-sources {
  padding-inline: clamp(2rem, 4.5vw, 4rem);
}

.vessel-hero {
  max-width: 64rem;
}

.vessel-hero h1,
.sonar-detail-hero h1 {
  max-width: none;
}

.back-link {
  display: inline-block;
  margin-bottom: 2rem;
  color: var(--slate);
  font-size: 0.82rem;
  font-weight: 700;
  text-decoration: none;
}

.back-link:hover,
.back-link:focus-visible {
  color: var(--seafoam);
}

.vessel-detail-page .vessel-dossier {
  margin-bottom: clamp(5rem, 9vw, 8rem);
  padding: clamp(2rem, 4.5vw, 4rem);
  border: 1px solid var(--line);
  border-radius: 1rem;
  background:
    radial-gradient(circle at 50% 70%, rgba(28, 200, 229, 0.08), transparent 40%),
    var(--panel-soft);
}

.vessel-dossier-header {
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.vessel-dossier-header p {
  margin: 0.55rem 0 0;
  color: var(--slate);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.vessel-figure {
  margin: 0;
}

.vessel-figure img {
  display: block;
  width: 100%;
  min-height: 16rem;
  max-height: 34rem;
  object-fit: contain;
}

.interactive-vessel-visual {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(15rem, 0.28fr);
  gap: 1rem;
  align-items: stretch;
}

.vessel-visual-stage {
  position: relative;
  min-width: 0;
  aspect-ratio: 1200 / 520;
}

.vessel-visual-stage > img,
.hotspot-layer {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
}

.vessel-visual-stage > img {
  object-fit: contain;
}

.hotspot-layer {
  overflow: visible;
}

.visual-hotspot {
  cursor: pointer;
  outline: none;
}

.visual-hotspot circle {
  fill: rgba(6, 26, 43, 0.78);
  stroke: var(--seafoam);
  stroke-width: 2.5;
  vector-effect: non-scaling-stroke;
}

.visual-hotspot .hotspot-core {
  fill: var(--seafoam);
  stroke: none;
}

.visual-hotspot:hover circle,
.visual-hotspot:focus-visible circle,
.visual-hotspot.selected circle {
  fill: var(--seafoam);
  stroke: var(--mist);
  stroke-width: 4;
}

.visual-hotspot:hover .hotspot-core,
.visual-hotspot:focus-visible .hotspot-core,
.visual-hotspot.selected .hotspot-core {
  fill: var(--abyss);
}

.visual-hotspot-details {
  display: grid;
  gap: 0.45rem;
  min-height: 10rem;
  padding: 1.2rem;
  align-content: center;
  border-left: 1px solid var(--line);
}

.visual-hotspot-details > span {
  color: var(--seafoam);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.visual-hotspot-details h3,
.visual-hotspot-details p {
  margin: 0;
}

.visual-hotspot-details p {
  color: var(--slate);
  font-size: 0.82rem;
}

.visual-pending {
  display: grid;
  min-height: 20rem;
  place-items: center;
  align-content: center;
  padding: 2rem;
  border: 1px dashed rgba(142, 177, 192, 0.28);
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 3rem,
      rgba(142, 177, 192, 0.035) 3rem,
      rgba(142, 177, 192, 0.035) 3.0625rem
    );
  text-align: center;
}

.visual-pending > span {
  color: rgba(142, 177, 192, 0.4);
  font-size: clamp(1.2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: 0.08em;
}

.visual-pending p {
  max-width: 36rem;
  color: var(--slate);
}

.vessel-dossier-panels {
  margin-top: clamp(1.5rem, 3vw, 2.5rem);
  border-top: 1px solid var(--line);
}

.vessel-dossier-panel {
  border-bottom: 1px solid var(--line);
}

.vessel-dossier-panel summary {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  padding: 1.2rem 0;
  cursor: pointer;
  list-style: none;
}

.vessel-dossier-panel summary::-webkit-details-marker {
  display: none;
}

.vessel-dossier-panel summary::after {
  grid-column: 2;
  grid-row: 1 / span 2;
  color: var(--seafoam);
  content: "+";
  font-size: 1.4rem;
}

.vessel-dossier-panel[open] summary::after {
  content: "−";
}

.vessel-dossier-panel summary > span {
  font-size: 1rem;
  font-weight: 800;
}

.vessel-dossier-panel summary > small {
  grid-column: 1;
  color: var(--slate);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.vessel-dossier-panel summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 0.35rem;
}

.vessel-data-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding-bottom: 1.5rem;
  border-top: 1px solid var(--line);
}

.vessel-data-grid > div {
  min-width: 0;
  padding: 1.5rem 1.5rem 0 0;
}

.vessel-data-grid dt {
  margin-bottom: 0.75rem;
  color: var(--slate);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.vessel-data-grid dd,
.vessel-data-grid ul {
  margin: 0;
}

.vessel-data-grid ul {
  padding-left: 1.1rem;
  color: var(--slate);
}

.vessel-data-grid .role-tags {
  display: flex;
}

.vessel-dossier-panel .record-evidence-grid {
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
}

.fact-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: var(--line);
}

.fact-grid article {
  display: grid;
  gap: 0.55rem;
  min-height: 12rem;
  padding: 1.4rem;
  align-content: center;
  background: var(--abyss);
}

.fact-grid strong {
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1;
}

.fact-grid small {
  color: var(--slate);
  font-size: 0.72rem;
}

.capability-grid,
.variant-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.capability-grid h3 {
  margin: 0;
}

.capability-grid ul {
  padding-left: 1.1rem;
}

.installation-list,
.unit-list,
.source-citation-grid {
  display: grid;
  gap: 0.75rem;
}

.installation-list article {
  display: grid;
  grid-template-columns: minmax(13rem, 0.42fr) minmax(0, 1fr) auto;
  gap: 1.25rem;
  align-items: center;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: var(--panel-soft);
}

.installation-list p {
  margin: 0;
  color: var(--slate);
}

.unit-list {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.unit-list article,
.source-citation {
  padding: 1.15rem;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: var(--panel-soft);
}

.unit-list p {
  margin: 0.35rem 0 0;
  color: var(--slate);
  font-size: 0.78rem;
}

.record-evidence-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(16rem, 0.42fr);
  gap: 1rem;
}

.record-evidence-grid > div,
.source-citation-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.record-evidence-grid aside {
  padding: 1.25rem;
  border: 1px solid rgba(242, 196, 109, 0.3);
  border-radius: 0.75rem;
}

.vessel-detail-page .visual-hotspot-details,
.vessel-detail-page .fact-grid article,
.vessel-detail-page .capability-grid > article,
.vessel-detail-page .installation-list article,
.vessel-detail-page .unit-list article,
.vessel-detail-page .source-citation,
.vessel-detail-page .record-evidence-grid aside {
  padding: clamp(1.5rem, 2.5vw, 2rem);
}

.record-evidence-grid aside h3 {
  margin-top: 0;
}

.record-evidence-grid aside ul {
  margin-bottom: 0;
  padding-left: 1.2rem;
  color: var(--slate);
}

.source-citation a {
  display: inline-block;
  margin-top: 0.8rem;
  color: var(--seafoam);
  font-size: 0.78rem;
  font-weight: 700;
}

.sonar-detail-hero {
  max-width: 62rem;
}

.sonar-entry-page .sonar-detail-hero {
  padding-bottom: clamp(3rem, 6vw, 4.5rem);
}

.sonar-detail-hero .manufacturer {
  margin: -0.5rem 0 1rem;
}

.sonar-entry-page .system-record {
  margin-bottom: clamp(5rem, 9vw, 8rem);
  padding: clamp(2rem, 4.5vw, 4rem);
  border: 1px solid var(--line);
  border-radius: 1rem;
  background:
    radial-gradient(circle at 90% 10%, rgba(28, 200, 229, 0.055), transparent 34%),
    var(--panel-soft);
}

.system-record-header {
  margin-bottom: 1.75rem;
}

.system-record-header h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.system-record-table {
  margin: 0;
  border-top: 1px solid var(--line);
}

.system-record-table > div {
  display: grid;
  grid-template-columns: minmax(10rem, 0.25fr) minmax(0, 0.75fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}

.system-record-table dt {
  color: var(--slate);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.system-record-table dd {
  min-width: 0;
  margin: 0;
  color: var(--mist);
}

.system-record-table .system-token-row {
  margin: -0.15rem 0;
}

.system-variant-list,
.system-installation-list {
  display: grid;
}

.system-variant-list article,
.system-installation-list article {
  padding: 0 0 1.25rem;
  border-bottom: 1px solid rgba(142, 177, 192, 0.14);
}

.system-variant-list article + article,
.system-installation-list article + article {
  padding-top: 1.25rem;
}

.system-variant-list article:last-child,
.system-installation-list article:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.system-variant-list header {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  justify-content: space-between;
}

.system-variant-list h3,
.system-installation-list h3 {
  margin: 0;
  font-size: 1rem;
}

.system-variant-list header > span,
.variant-meta,
.system-installation-list small {
  color: var(--slate);
  font-size: 0.68rem;
  font-weight: 700;
}

.system-variant-list header > span {
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.system-variant-list p,
.system-installation-list p {
  margin: 0.45rem 0 0;
  color: var(--slate);
}

.variant-meta {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.65rem;
  text-transform: uppercase;
}

.system-installation-list h3 a {
  color: var(--mist);
  text-decoration-color: rgba(110, 231, 200, 0.35);
  text-underline-offset: 0.2em;
}

.system-installation-list small {
  display: block;
  margin-top: 0.55rem;
  line-height: 1.55;
}

.system-source-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.system-source-list li {
  display: grid;
  grid-template-columns: minmax(9rem, 0.32fr) minmax(0, 0.68fr);
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid rgba(142, 177, 192, 0.14);
}

.system-source-list li:first-child {
  padding-top: 0;
}

.system-source-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.system-source-list span {
  color: var(--slate);
  font-size: 0.74rem;
}

.system-source-list a {
  color: var(--seafoam);
  font-size: 0.78rem;
  font-weight: 700;
}

.system-record-scope {
  margin: 1.5rem 0 0;
  color: var(--slate);
  font-size: 0.74rem;
  line-height: 1.6;
}

.system-boundary {
  display: grid;
  grid-template-columns: minmax(10rem, 0.28fr) minmax(0, 1fr);
  gap: 1.5rem;
  margin-bottom: clamp(5rem, 9vw, 8rem);
  padding: 1.4rem;
  border: 1px solid rgba(242, 196, 109, 0.35);
  border-radius: 0.8rem;
  background: rgba(242, 196, 109, 0.055);
}

.system-boundary p {
  margin: 0;
  color: var(--slate);
}

.variant-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.installation-matrix {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
}

.matrix-row {
  display: grid;
  grid-template-columns: 1.25fr 1fr 0.65fr 0.65fr 1.5fr;
}

.matrix-row > span {
  display: grid;
  gap: 0.25rem;
  min-width: 0;
  padding: 1rem;
  border-right: 1px solid var(--line);
  border-top: 1px solid var(--line);
  color: var(--mist);
  font-size: 0.78rem;
}

.matrix-row > span:last-child {
  border-right: 0;
}

.matrix-row small {
  color: var(--slate);
}

.matrix-header {
  background: var(--panel);
}

.matrix-header > span {
  border-top: 0;
  color: var(--slate);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 1000px) {
  .catalog-layout {
    grid-template-columns: 1fr;
  }

  .catalog-filters {
    position: static;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: end;
  }

  .catalog-filters .clear-filters {
    margin-top: 0;
  }

  .sonar-system-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .comparison-grid,
  .variant-grid {
    grid-template-columns: 1fr;
  }

  .fact-grid,
  .unit-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .matrix-row {
    grid-template-columns: 1fr 1fr;
    padding: 0.4rem;
    border-top: 1px solid var(--line);
  }

  .matrix-row > span,
  .matrix-row > span:nth-child(n) {
    border: 0;
  }

  .matrix-header {
    display: none;
  }
}

@media (max-width: 760px) {
  .catalog-heading,
  .vessel-hero,
  .record-evidence-grid,
  .system-boundary {
    grid-template-columns: 1fr;
  }

  .coverage-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .coverage-strip > div:nth-child(2) {
    border-right: 0;
  }

  .fleet-card-grid,
  .sonar-system-grid,
  .record-evidence-grid > div,
  .source-citation-grid {
    grid-template-columns: 1fr;
  }

  .catalog-filters {
    grid-template-columns: 1fr 1fr;
  }

  .installation-list article {
    grid-template-columns: 1fr;
  }

  .interactive-vessel-visual {
    grid-template-columns: 1fr;
  }

  .system-record-table > div,
  .system-source-list li {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .system-variant-list header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.35rem;
  }

  .visual-hotspot-details {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .vessel-data-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 500px) {
  .catalog-hero,
  .vessel-hero,
  .sonar-detail-hero {
    padding-top: 3.5rem;
  }

  .catalog-hero h1,
  .vessel-hero h1,
  .sonar-detail-hero h1 {
    font-size: clamp(3rem, 15vw, 4.7rem);
  }

  .catalog-filters,
  .fact-grid,
  .unit-list {
    grid-template-columns: 1fr;
  }

  .coverage-strip > div {
    min-height: 5.75rem;
    border-bottom: 1px solid var(--line);
  }

  .fleet-card-meta,
  .fleet-card-footer,
  .comparison-panel > header {
    align-items: flex-start;
    flex-direction: column;
  }

  .matrix-row {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .catalog-filters input,
  .catalog-filters select,
  .fleet-card,
  .sonar-system-grid > article {
    transition: none;
  }
}