.resource-main {
  min-width: 0;
  padding-bottom: 16px;
  line-height: 1.65;
}

.resource-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  border-bottom: 1px solid var(--line);
}

.resource-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  border-bottom: 2px solid transparent;
  padding: 10px 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--motion-fast) ease, border-color var(--motion-fast) ease;
}

.resource-nav [aria-current] {
  border-bottom-color: var(--ink);
  color: var(--ink);
  font-weight: 600;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 17px 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.breadcrumbs a {
  color: var(--muted);
}

h1 {
  margin-bottom: 20px;
  font-size: clamp(32px, 3.8vw, 42px);
  font-weight: 680;
  line-height: 1.16;
  letter-spacing: -1.2px;
  overflow-wrap: break-word;
}

h2 {
  margin: 0 0 16px;
  font-size: 24px;
  font-weight: 650;
  line-height: 1.3;
  letter-spacing: -.45px;
}

h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 650;
  line-height: 1.4;
}

p {
  margin-bottom: 16px;
}

.resource-main a,
.resource-main td,
.resource-main th,
.resource-main dd {
  overflow-wrap: anywhere;
}

.resource-main ul,
.resource-main ol {
  margin-top: 0;
  margin-bottom: 20px;
  padding-left: 24px;
}

.resource-main li {
  margin-bottom: 8px;
}

.lead {
  max-width: 72ch;
  margin-bottom: 20px;
  color: var(--text);
  font-size: 18px;
  line-height: 1.6;
}

.small {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
  overflow-wrap: anywhere;
}

.category-label {
  margin: 0 0 10px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 650;
  line-height: 1.5;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.resource-intro {
  max-width: 860px;
  padding: 8px 0 28px;
  margin-bottom: 20px;
}

.resource-intro > :last-child {
  margin-bottom: 0;
}

.download-links {
  padding-top: 4px;
  font-size: 14px;
  line-height: 1.8;
}

.download-links a {
  display: inline-block;
  padding-block: 4px;
}

.reference-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(260px, 1fr);
  margin-bottom: 36px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.measurement-panel,
.conversion-panel {
  min-width: 0;
  padding: 28px;
}

.measurement-panel h1 {
  margin-bottom: 18px;
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: -.8px;
}

.measure-value {
  margin-bottom: 16px;
  color: var(--ink);
  font-size: clamp(36px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -.035em;
  overflow-wrap: anywhere;
}

.measurement-panel .lead {
  font-size: 16px;
}

.measurement-panel > .small {
  margin: 0;
}

.reference-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin: 22px 0 16px;
}

.conversion-panel {
  border-left: 1px solid var(--line);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--pale);
}

.conversion-panel h2 {
  max-width: 25ch;
  margin-bottom: 18px;
  font-size: 19px;
  line-height: 1.4;
  letter-spacing: -.2px;
}

.conversion-panel > .small {
  margin: 16px 0 0;
}

.conversion-panel td {
  font-weight: 650;
  text-align: right;
  white-space: nowrap;
}

.conversion-panel thead th:last-child {
  text-align: right;
}

.reading-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(280px, 1fr);
  gap: 48px;
  margin: 36px 0 40px;
}

.reading-grid > article {
  min-width: 0;
}

.reading-grid article p,
.reading-grid article li {
  max-width: 76ch;
}

.reading-grid section {
  margin: 0 0 36px;
}

.reading-grid section:last-child {
  margin-bottom: 0;
}

.evidence-panel {
  align-self: start;
  min-width: 0;
  border-left: 3px solid var(--gold);
  padding-left: 24px;
  font-size: 15px;
  scroll-margin-top: 24px;
}

.evidence-panel h2 {
  margin-top: 28px;
  font-size: 20px;
}

.evidence-panel h2:first-child {
  margin-top: 0;
}

.facts {
  display: grid;
  grid-template-columns: minmax(120px, .75fr) minmax(0, 1.5fr);
  column-gap: 24px;
  margin: 24px 0 0;
  border-top: 1px solid var(--line);
}

.facts dt,
.facts dd {
  margin: 0;
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
  font-size: 14px;
  line-height: 1.65;
}

.facts dt {
  color: var(--muted);
}

.facts dd {
  color: var(--text);
}

.resource-main .source-list {
  padding-left: 22px;
}

.source-list li {
  padding-left: 3px;
}

.source-list a {
  font-weight: 650;
}

.source-list p {
  margin: 6px 0;
}

.source-list .small {
  margin-bottom: 20px;
}

.citation {
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 16px;
  background: var(--white);
  font-size: 14px;
  line-height: 1.65;
  overflow-wrap: anywhere;
}

.scale-figure {
  margin: 24px 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 20px 24px;
  background: var(--white);
}

.scale-row {
  margin-bottom: 18px;
}

.scale-row:last-of-type {
  margin-bottom: 0;
}

.scale-label {
  margin: 0 0 6px;
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.scale-row svg {
  display: block;
  width: 100%;
  height: 24px;
}

.scale-track {
  stroke: var(--line);
  vector-effect: non-scaling-stroke;
}

.scale-bar {
  fill: var(--gold);
}

.scale-bar--reference {
  fill: var(--blue);
}

.scale-figure figcaption {
  margin-top: 18px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}

.formula {
  border-left: 3px solid var(--gold);
  padding: 20px;
  background: var(--pale);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.65;
}

.related {
  margin: 36px 0;
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

.resource-main .related ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 28px;
  padding: 0;
  list-style: none;
}

.related li {
  margin: 0;
}

.related a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
}

.category-directory {
  margin-bottom: 32px;
  border-block: 1px solid var(--line);
  background: var(--white);
}

.category-directory summary {
  min-height: 52px;
  padding: 14px 20px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  cursor: pointer;
}

.category-directory summary::marker {
  color: var(--blue);
}

.category-directory[open] summary {
  border-bottom: 1px solid var(--line);
}

.category-jumps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0 28px;
  padding: 12px 20px;
}

.category-jumps a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 44px;
  padding: 8px 0;
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
}

.category-count {
  flex: none;
  color: var(--muted);
  font-size: 13px;
}

.reference-section {
  margin: 32px 0 40px;
  scroll-margin-top: 24px;
}

.reference-section-heading {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin-bottom: 14px;
}

.reference-section-heading h2 {
  margin: 0;
  font-size: 26px;
}

.reference-section-heading > span {
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 36px;
  border-top: 1px solid var(--line);
  padding: 0 24px;
  background: var(--white);
}

.library-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: 20px;
  min-width: 0;
  border-bottom: 1px solid var(--line);
  padding: 16px 0 20px;
}

.library-copy {
  min-width: 0;
}

.library-copy h3 {
  margin: 0;
  font-size: 16px;
}

.library-copy h3 a {
  display: block;
  min-height: 44px;
  padding: 9px 0;
}

.library-copy p {
  margin: 0 0 6px;
  font-size: 14px;
  line-height: 1.5;
}

.library-copy .small {
  margin: 0;
  font-size: 13px;
}

.library-value {
  max-width: 10ch;
  margin: 0;
  padding-top: 10px;
  color: var(--ink);
  font-size: 20px;
  font-weight: 650;
  line-height: 1.4;
  text-align: right;
  overflow-wrap: anywhere;
}

.collection-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
  margin-bottom: 40px;
}

.collection-grid article {
  border-top: 3px solid var(--gold);
  padding: 28px;
  background: var(--white);
}

.collection-grid h2 {
  margin-bottom: 14px;
}

.collection-grid p {
  margin: 0;
}

.archive-note {
  margin: 0 0 24px;
  border: 1px solid #e4c68d;
  border-left: 3px solid var(--gold);
  border-radius: 4px;
  padding: 16px 20px;
  background: #fff5df;
  font-size: 14px;
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.resource-main .archive-list {
  margin: 12px 0 32px;
  padding: 0;
  list-style: none;
}

.archive-list li {
  margin: 0;
  border-bottom: 1px solid var(--line);
  padding: 24px 0;
}

.archive-list h2 {
  margin-bottom: 10px;
}

.archive-list p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  overflow-wrap: anywhere;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  line-height: 1.6;
  text-align: left;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 14px 12px;
  vertical-align: top;
}

th:first-child,
td:first-child {
  padding-left: 0;
}

th:last-child,
td:last-child {
  padding-right: 0;
}

thead th {
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

tbody th {
  font-weight: 600;
}

.table-scroll {
  overflow-x: auto;
  overscroll-behavior-x: contain;
  margin: 20px 0 32px;
}

.table-scroll:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
}

.table-hint {
  display: none;
}

.resource-main .steps {
  padding-left: 24px;
}

.steps li {
  margin-bottom: 16px;
  padding-left: 4px;
}

@media (hover: hover) {
  .resource-nav a:hover,
  .breadcrumbs a:hover {
    color: var(--ink);
  }

  .category-jumps a:hover {
    text-decoration: underline;
  }
}

@media (max-width: 900px) {
  .reference-layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(240px, 1fr);
  }

  .measurement-panel,
  .conversion-panel {
    padding: 24px;
  }

  .reading-grid {
    display: block;
    margin-top: 32px;
  }

  .evidence-panel {
    margin-top: 32px;
  }

  .category-jumps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 24px;
  }

  .library-grid {
    column-gap: 24px;
    padding-inline: 20px;
  }

  .library-item {
    gap: 16px;
  }

  .library-value {
    max-width: 8ch;
  }

  .collection-grid {
    gap: 20px;
  }

  .collection-grid article {
    padding: 24px;
  }
}

@media (max-width: 680px) {
  .resource-nav {
    gap: 8px;
  }

  .resource-nav a {
    flex: 1;
    justify-content: center;
    padding-inline: 4px;
    text-align: center;
  }

  .breadcrumbs {
    padding: 14px 0;
  }

  h1 {
    font-size: 30px;
    line-height: 1.2;
    letter-spacing: -.9px;
  }

  h2 {
    font-size: 23px;
  }

  .lead {
    font-size: 16px;
  }

  .resource-intro {
    padding: 6px 0 24px;
    margin-bottom: 12px;
  }

  .reference-layout {
    display: block;
    margin-bottom: 28px;
  }

  .measurement-panel,
  .conversion-panel {
    padding: 20px;
  }

  .measurement-panel h1 {
    font-size: 28px;
  }

  .measure-value {
    font-size: 38px;
  }

  .reference-actions {
    gap: 8px 16px;
  }

  .conversion-panel {
    border-top: 1px solid var(--line);
    border-left: 0;
    border-radius: 0 0 var(--radius) var(--radius);
  }

  .conversion-panel h2 {
    max-width: none;
    font-size: 18px;
  }

  .conversion-panel th,
  .conversion-panel td {
    padding-block: 10px;
  }

  .reading-grid section {
    margin-bottom: 30px;
  }

  .evidence-panel {
    padding-left: 18px;
  }

  .facts {
    grid-template-columns: minmax(96px, .75fr) minmax(0, 1.5fr);
    column-gap: 16px;
  }

  .facts dt,
  .facts dd {
    padding-block: 10px;
  }

  .scale-figure {
    margin-block: 20px;
    padding: 16px;
  }

  .formula {
    padding: 16px;
    font-size: 15px;
  }

  .category-directory summary {
    padding-inline: 16px;
  }

  .category-jumps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 20px;
    padding-inline: 16px;
  }

  .reference-section-heading h2 {
    font-size: 24px;
  }

  .library-grid {
    grid-template-columns: 1fr;
    padding-inline: 16px;
  }

  .collection-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .collection-grid article {
    padding: 24px 20px;
  }

  .table-hint {
    display: block;
    margin: 0 0 8px;
    color: var(--muted);
    font-size: 13px;
    line-height: 1.6;
  }

  .table-hint + .table-scroll {
    margin-top: 8px;
  }

  .table-scroll table {
    min-width: 580px;
  }

  .reading-grid th,
  .reading-grid td {
    padding: 12px 8px;
    font-size: 14px;
  }

  .reading-grid th:first-child,
  .reading-grid td:first-child {
    padding-left: 0;
  }

  .reading-grid th:last-child,
  .reading-grid td:last-child {
    padding-right: 0;
  }
}

@media print {
  .resource-nav,
  .breadcrumbs,
  .reference-actions,
  .primary-button,
  .category-directory,
  .table-hint {
    display: none;
  }

  .resource-main {
    padding: 0;
    font-size: 11px;
    line-height: 1.5;
  }

  h1 {
    font-size: 26px;
  }

  h2 {
    margin-bottom: 10px;
    font-size: 18px;
    break-after: avoid;
  }

  h3 {
    break-after: avoid;
  }

  .resource-intro {
    max-width: none;
    margin-bottom: 16px;
    padding: 0;
  }

  .lead,
  .measurement-panel .lead {
    font-size: 13px;
  }

  .reference-layout,
  .reading-grid {
    display: block;
    margin: 18px 0;
    border: 0;
    background: transparent;
  }

  .measurement-panel,
  .conversion-panel {
    border: 0;
    padding: 8px 0;
    background: transparent;
  }

  .measurement-panel h1 {
    font-size: 26px;
  }

  .measure-value {
    font-size: 28px;
  }

  .reading-grid section {
    margin-bottom: 22px;
  }

  .evidence-panel {
    margin-top: 24px;
    border: 0;
    padding: 0;
    font-size: 12px;
  }

  .facts dt,
  .facts dd,
  .small,
  .citation {
    font-size: 11px;
  }

  .library-grid,
  .collection-grid {
    display: block;
    padding: 0;
    background: transparent;
  }

  .library-item,
  .collection-grid article,
  .scale-figure,
  .source-list li,
  tr {
    break-inside: avoid;
  }

  .library-item,
  .collection-grid article {
    padding: 12px 0;
    background: transparent;
  }

  .library-copy h3 a {
    min-height: 0;
    padding-block: 3px;
  }

  .collection-grid article {
    margin-bottom: 20px;
  }

  .scale-figure {
    padding: 12px;
  }

  .table-scroll {
    overflow: visible;
  }

  .table-scroll table {
    min-width: 0;
  }

  th,
  td {
    padding-block: 8px;
    font-size: 11px;
  }

  a {
    color: #111;
  }
}


/* Progressive reference discovery and evidence-led collection examples */
.library-finder {
  margin: 0 0 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  background: var(--white);
}
.library-finder label { display: block; margin-bottom: 8px; font-weight: 650; color: var(--ink); }
.library-finder input { display: block; width: 100%; max-width: 540px; }
.library-finder [role="status"] { margin: 8px 0 0; font-size: 13px; color: var(--muted); }
.library-finder #reference-empty { margin: 10px 0 0; }
.library-featured { display: flex; flex-wrap: wrap; gap: 10px 20px; margin: 0 0 24px; }
.library-featured a { display: inline-flex; align-items: center; min-height: 44px; }
.worked-example { margin: 8px 0 32px; border: 1px solid var(--line); border-left: 4px solid var(--blue); border-radius: var(--radius); background: var(--white); padding: 24px; }
.worked-example h2 { max-width: 52ch; font-size: clamp(19px, 2.5vw, 24px); }
.worked-example .example-result { max-width: 50ch; font-size: clamp(19px, 2.5vw, 25px); font-weight: 650; color: var(--ink); line-height: 1.35; }
.worked-example > p:not(.category-label):not(.example-result) { max-width: 70ch; }
@media (max-width: 680px) {
  .library-finder { padding: 16px; }
  .library-featured { display: grid; gap: 2px; }
  .worked-example { padding: 18px; }
  .worked-example .primary-button { width: 100%; }
}
@media print { .library-finder { display: none; } }