.knowledge-card.has-media {
  min-height: 300px;
  padding: 22px;
  overflow: hidden;
}

.knowledge-card-media {
  position: relative;
  height: clamp(210px, 18vw, 260px);
  margin: -22px -22px 18px;
  display: block;
  overflow: hidden;
  border-bottom: 1px solid var(--ink);
  background: #f3f0df;
}

.knowledge-card-media-label {
  position: absolute;
  left: 10px;
  bottom: 10px;
  max-width: calc(100% - 20px);
  padding: 6px 8px;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  font: 500 9px/1 var(--mono);
  letter-spacing: .08em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.knowledge-card-media-label.is-focused {
  border: 1px solid var(--ink);
  background: var(--lime);
  color: var(--ink);
}

.knowledge-card-media-label.is-regional {
  background: var(--ink);
  color: var(--paper);
}

.knowledge-card-media img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  object-position: center;
  padding: 4px;
  background: #fff;
}

.muscle-card-image-fallback {
  width: 100%;
  height: 100%;
  padding: 18px;
  display: grid;
  place-items: center;
  background: #f3f0df;
  color: var(--muted);
  font: 500 9px/1.35 var(--mono);
  letter-spacing: .08em;
  text-align: center;
  text-transform: uppercase;
}

.muscle-region-grid > .knowledge-card .knowledge-card-media {
  height: clamp(172px, 16vw, 204px);
}

.muscle-region-grid > .knowledge-card .knowledge-card-media img {
  padding: 4px 8px;
}

.knowledge-card.has-media h3 {
  margin: 30px 0 12px;
  font-size: 26px;
}

.knowledge-card.has-media .knowledge-card-link { padding-top: 20px; }

.detail-anatomy-image {
  margin: 0 0 30px;
  border: 1px solid var(--ink);
  background: #f3f0df;
}

.detail-anatomy-image img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  object-position: center;
}

.anatomy-zoom-button {
  position: relative;
  width: 100%;
  height: clamp(320px, 34vw, 420px);
  padding: 0;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 0;
  background: #f3f0df;
  color: var(--ink);
  cursor: zoom-in;
}

.detail-anatomy-image.is-focused .anatomy-zoom-button img {
  transform: scale(1.02);
  transition: transform 180ms ease;
}

.detail-anatomy-image.is-focused .anatomy-zoom-button:hover img,
.detail-anatomy-image.is-focused .anatomy-zoom-button:focus-visible img {
  transform: scale(1.05);
}

.anatomy-zoom-label {
  position: absolute;
  right: 12px;
  bottom: 12px;
  padding: 8px 10px;
  border: 1px solid var(--ink);
  background: var(--paper);
  font-size: 11px;
  font-weight: 800;
}

.anatomy-zoom-button:hover .anatomy-zoom-label,
.anatomy-zoom-button:focus-visible .anatomy-zoom-label {
  background: var(--lime);
}

.anatomy-viewer {
  width: min(1000px, calc(100% - 32px));
  max-height: calc(100vh - 32px);
  padding: 0;
  border: 1px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
}

.anatomy-viewer::backdrop { background: rgb(17 17 15 / 82%); }

.anatomy-viewer-panel { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) 290px; }

.anatomy-viewer-image {
  width: 100%;
  height: min(78vh, 780px);
  display: block;
  object-fit: contain;
  background: #fff;
}

.anatomy-viewer-copy { padding: 72px 28px 28px; border-left: 1px solid var(--ink); }
.anatomy-viewer-copy h3 { margin: 18px 0; font-size: 30px; line-height: 1; letter-spacing: -.05em; }
.anatomy-viewer-note { color: var(--muted); font-size: 13px; line-height: 1.65; }

.anatomy-viewer-close {
  position: absolute;
  z-index: 1;
  right: 14px;
  top: 14px;
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.detail-anatomy-image figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 11px;
  line-height: 1.5;
}

.detail-anatomy-image figcaption a {
  text-underline-offset: 3px;
}

.detail-anatomy-image.is-focused figcaption {
  border-top-color: var(--ink);
  background: color-mix(in srgb, var(--lime) 18%, var(--paper));
  color: var(--ink);
}

.detail-anatomy-image.is-regional figcaption {
  border-top-color: var(--ink);
}

.detail-source { margin-top: 16px; color: var(--muted); font-size: 12px; }
.detail-source a { text-underline-offset: 3px; }

.muscle-role-list {
  padding: 0;
  list-style: none;
  margin: -4px 0 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.muscle-role {
  padding: 0;
  display: inline-flex;
  align-items: stretch;
  border: 1px solid var(--ink);
  background: color-mix(in srgb, var(--lime) 22%, var(--paper));
  color: var(--ink);
  font: 600 9px/1 var(--mono);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.muscle-role-id,
.muscle-role-name { padding: 6px 8px; }
.muscle-role-id { border-right: 1px solid var(--ink); background: var(--ink); color: var(--lime); }
.detail-movement-functions { margin-bottom: 30px; padding: 22px; border: 1px solid var(--ink); background: var(--panel); }
.detail-movement-functions h3 { margin: 10px 0 20px; font-size: 30px; letter-spacing: -.04em; }
.detail-action-notes { margin-top: 18px; color: var(--muted); font-size: 14px; line-height: 1.7; }
.focused-image-notice { margin: 0 0 30px; padding: 24px; border: 1px dashed var(--ink); background: color-mix(in srgb, var(--panel) 64%, transparent); }
.focused-image-notice strong { display: block; margin-bottom: 8px; }
.focused-image-notice p { color: var(--muted); font-size: 13px; line-height: 1.65; }

.muscle-relationships { margin-top: 64px; padding-top: 48px; border-top: 1px solid var(--ink); }
.muscle-relationships-heading { max-width: 820px; }
.muscle-relationships-heading h3 { margin: 14px 0 16px; font-size: clamp(30px, 4vw, 52px); line-height: .98; letter-spacing: -.06em; }
.muscle-relationships-heading > p:last-child { color: var(--muted); font-size: 14px; line-height: 1.7; }
.muscle-relationship-grid { margin-top: 30px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.muscle-relationship-column { min-width: 0; padding: 26px; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.muscle-relationship-column.is-synergist { background: color-mix(in srgb, var(--lime) 12%, transparent); }
.muscle-relationship-column h4 { font-size: 22px; letter-spacing: -.04em; }
.muscle-relationship-description,
.muscle-relationship-empty { margin-top: 8px; color: var(--muted); font-size: 12px; line-height: 1.55; }
.muscle-relationship-list { margin: 22px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.muscle-relationship-list li { border-bottom: 1px solid var(--line); }
.muscle-relationship-link { width: 100%; padding: 14px 0; display: grid; gap: 6px; border: 0; background: transparent; color: var(--ink); text-align: left; cursor: pointer; }
.muscle-relationship-link:hover strong,
.muscle-relationship-link:focus-visible strong { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 4px; }
.muscle-relationship-link span { color: var(--muted); font: 500 9px/1.5 var(--mono); letter-spacing: .05em; text-transform: uppercase; }

.detail-muscle-roles { margin: 0 0 22px; }

.muscle-tools {
  margin: -8px 0 26px;
  padding: 18px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 68%, transparent);
}

.muscle-tools[hidden], .muscle-action-browser[hidden], .muscle-tool-selects[hidden], .muscle-atlas[hidden] { display: none; }

.muscle-directory-controls {
  min-width: 0;
  width: 100%;
  max-width: 100%;
  flex: 1 1 100%;
  order: 0;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.muscle-directory-controls[hidden] { display: none; }

@media (max-width: 360px) {
  .knowledge-nav { flex-wrap: wrap; gap: 8px; padding-top: 12px; padding-bottom: 12px; }
  .knowledge-nav-links { margin-left: auto; }
}

.muscle-directory-controls.is-below-directory {
  width: 100%;
  margin: 26px 0 0;
  padding: 18px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 68%, transparent);
}

.muscle-action-browser {
  flex: 1 1 100%;
  order: 1;
  padding: 24px;
  border: 1px solid var(--ink);
  background: var(--paper);
}

.muscle-action-heading { display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, .65fr); gap: 24px; align-items: end; }
.muscle-action-heading h3 { margin-top: 8px; font-size: clamp(26px, 4vw, 48px); line-height: .96; letter-spacing: -.06em; }
.muscle-action-heading > p { color: var(--muted); font-size: 13px; line-height: 1.6; }
.muscle-action-sections { margin-top: 24px; display: grid; gap: 20px; }
.muscle-action-section h4 { margin-bottom: 9px; color: var(--teal); font: 600 10px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.muscle-action-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.muscle-action-card { min-height: 98px; padding: 16px; display: grid; grid-template-columns: auto 1fr; gap: 8px 12px; align-content: start; border: 0; border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink); background: var(--paper); color: var(--ink); text-align: left; cursor: pointer; transition: background .18s ease, transform .18s ease; }
.muscle-action-card:hover, .muscle-action-card:focus-visible, .muscle-action-card.is-active { position: relative; z-index: 1; background: var(--lime); transform: translate(-2px, -2px); box-shadow: 3px 3px 0 var(--ink); }
.muscle-action-code { grid-row: 1 / span 2; padding-top: 2px; color: var(--teal); font: 600 9px/1 var(--mono); }
.muscle-action-card strong { font-size: 16px; line-height: 1.15; }
.muscle-action-card small { color: var(--muted); font: 500 9px/1.35 var(--mono); text-transform: uppercase; }

.muscle-action-disclosure { border: 1px solid var(--ink); background: var(--paper); }
.muscle-action-disclosure + .muscle-action-disclosure { margin-top: -12px; }
.muscle-action-disclosure > summary { min-height: 62px; padding: 0 18px; display: grid; grid-template-columns: 1fr auto 28px; align-items: center; gap: 18px; list-style: none; cursor: pointer; }
.muscle-action-disclosure > summary::-webkit-details-marker { display: none; }
.muscle-action-disclosure > summary:hover { background: color-mix(in srgb, var(--lime) 35%, var(--paper)); }
.muscle-action-disclosure > summary span { font-size: 18px; font-weight: 850; letter-spacing: -.025em; }
.muscle-action-disclosure > summary small { color: var(--muted); font: 500 9px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.muscle-action-disclosure > summary b { width: 28px; height: 28px; display: grid; place-items: center; border: 1px solid var(--ink); font-size: 18px; line-height: 1; transition: transform .18s ease; }
.muscle-action-disclosure[open] > summary { background: var(--ink); color: var(--paper); }
.muscle-action-disclosure[open] > summary small { color: #b9b9b0; }
.muscle-action-disclosure[open] > summary b { border-color: var(--lime); color: var(--lime); transform: rotate(45deg); }
.muscle-action-disclosure .muscle-action-grid { margin: 0 -1px -1px; }

.muscle-path-heading { flex: 1 1 100%; display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, .6fr); gap: 32px; align-items: end; padding-bottom: 22px; border-bottom: 1px solid var(--ink); }
.muscle-path-heading h3 { margin-top: 8px; font-size: clamp(28px, 4vw, 48px); line-height: .96; letter-spacing: -.06em; }
.muscle-path-heading > p { max-width: 470px; color: var(--muted); font-size: 13px; line-height: 1.65; }

.muscle-region-filters {
  flex: 1 1 100%;
  display: grid;
  grid-template-columns: minmax(130px, .6fr) repeat(3, minmax(220px, 1fr));
  align-items: stretch;
  gap: 10px;
}

.muscle-selection-summary { flex: 1 1 100%; order: 2; min-height: 54px; padding: 10px 14px; display: flex; align-items: center; gap: 12px; border: 1px solid var(--ink); background: var(--ink); color: var(--paper); }
.muscle-selection-summary > span { margin-right: auto; color: #aaa9a1; font: 500 9px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.muscle-selection-summary strong { font-size: 12px; }
.muscle-selection-summary strong:last-child { color: #aaa9a1; }
.muscle-selection-summary strong.is-selected { color: var(--lime); }
.muscle-selection-summary b { color: var(--lime); font-size: 16px; }

.muscle-filter-section {
  padding: 11px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
}

.muscle-filter-heading {
  display: block;
  margin-bottom: 9px;
  color: var(--muted);
  font: 600 9px/1 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.muscle-filter-row { display: flex; flex-wrap: wrap; gap: 6px; }

.muscle-region-all { align-self: stretch; justify-content: center; }

.muscle-region-filters button {
  min-height: 38px;
  padding: 0 12px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  font-size: 12px;
  font-weight: 800;
  cursor: pointer;
}

.muscle-region-filters button:hover,
.muscle-region-filters button.is-active {
  border-color: var(--ink);
  background: var(--ink);
  color: var(--paper);
}

.muscle-region-filters [data-region-count] {
  min-width: 22px;
  height: 22px;
  padding: 0 6px;
  display: inline-grid;
  place-items: center;
  border-radius: 999px;
  background: var(--lime);
  color: var(--ink);
  font: 500 10px/1 var(--mono);
}

.muscle-group-filter-shell {
  flex: 1 1 100%;
  order: 3;
  padding-top: 15px;
  border-top: 1px solid var(--line);
}

.muscle-path-heading { order: 0; }
.muscle-region-filters { order: 1; }
.muscle-tool-selects { order: 4; }

.muscle-group-filter-shell[hidden] { display: none; }

.muscle-group-filter-label {
  display: block;
  margin-bottom: 9px;
  color: var(--muted);
  font: 500 10px/1 var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
}

.muscle-group-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.muscle-group-filters button {
  min-height: 36px;
  padding: 0 11px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font: 700 11px/1 var(--body);
  cursor: pointer;
}

.muscle-group-filters button:hover,
.muscle-group-filters button.is-active {
  background: var(--lime);
}

.muscle-group-filters button span {
  color: var(--muted);
  font: 500 9px/1 var(--mono);
}

.muscle-tool-selects {
  display: flex;
  align-items: flex-end;
  gap: 10px;
}

.muscle-sort,
.muscle-function,
.muscle-visual {
  min-width: 150px;
  display: grid;
  gap: 7px;
  color: var(--muted);
  font: 500 10px/1 var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
}

.muscle-sort select,
.muscle-function select,
.muscle-visual select {
  height: 38px;
  padding: 0 34px 0 11px;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  font: 700 12px/1 var(--body);
}

.muscle-reset {
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--ink);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  font: 700 12px/1 var(--body);
  cursor: pointer;
}

.muscle-reset:hover,
.muscle-reset:focus-visible {
  background: var(--ink);
  color: var(--paper);
}

.knowledge-grid.is-grouped {
  display: block;
  border: 0;
}

.muscle-region-section + .muscle-region-section {
  margin-top: 54px;
}

.muscle-region-heading {
  min-height: 58px;
  padding: 0 2px 14px;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--ink);
}

.muscle-region-heading h3 {
  font-size: clamp(26px, 3.2vw, 42px);
  line-height: .95;
  letter-spacing: -.06em;
}

.muscle-region-heading span {
  color: var(--muted);
  font: 500 10px/1 var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
}

.muscle-subgroups {
  display: grid;
  gap: 30px;
  padding-top: 18px;
}

.muscle-subgroup {
  min-width: 0;
}

.muscle-subgroup-heading {
  padding: 0 2px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.muscle-subgroup-heading h4 {
  font: 800 13px/1.2 var(--body);
  letter-spacing: .01em;
}

.muscle-subgroup-heading span {
  min-width: 24px;
  height: 24px;
  display: inline-grid;
  place-items: center;
  border-radius: 999px;
  background: var(--lime);
  color: var(--ink);
  font: 500 10px/1 var(--mono);
}

.muscle-family-list {
  display: grid;
  gap: 24px;
}

.muscle-family {
  min-width: 0;
  padding: 14px 0 0 18px;
  border-left: 3px solid color-mix(in srgb, var(--teal) 58%, transparent);
}

.muscle-family-heading {
  padding: 0 2px 10px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.muscle-family-heading h5 {
  font: 700 12px/1.2 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--teal);
}

.muscle-family-heading span {
  color: var(--muted);
  font: 500 9px/1 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.muscle-region-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-left: 1px solid var(--ink);
}

.muscle-region-grid .knowledge-card {
  min-height: 260px;
  min-width: 0;
}

.muscle-collective-card {
  background: var(--panel);
}

@media (max-width: 1040px) {
  .muscle-region-filters { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .muscle-region-all { min-height: 62px; }
}

@media (max-width: 680px) {
  .muscle-region-filters { grid-template-columns: 1fr; }
  .muscle-filter-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .muscle-filter-row button { justify-content: space-between; }
}

.knowledge-card.muscle-group-card { min-width: 0; }
.muscle-group-card .knowledge-card-media { height: 240px; flex-shrink: 0; }
.muscle-group-card .knowledge-card-media img { padding: 12px; }
.muscle-group-card .muscle-group-reference { font-size: 12px; }
.muscle-group-card:focus-visible { outline: 3px solid var(--ink); outline-offset: -4px; background: var(--lime); }

.muscle-collective-card:hover,
.muscle-collective-card:focus-visible { background: var(--lime); }

.muscle-collective-card .knowledge-card-media {
  height: clamp(172px, 16vw, 204px);
  background: #fff;
}

.muscle-collective-card .knowledge-card-media img {
  object-fit: contain;
  object-position: center;
  padding: 4px 8px;
}

.movement-results { width: 100%; padding-top: 32px; border-top: 1px solid var(--ink); }
.movement-results-heading { display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, .65fr); gap: 0 40px; align-items: end; margin-bottom: 34px; }
.movement-results-heading .eyebrow { grid-column: 1; }
.movement-results-heading h3 { grid-column: 1; margin: 10px 0 0; font-size: clamp(34px, 5vw, 64px); line-height: .92; letter-spacing: -.065em; }
.movement-results-heading > p:last-child { grid-column: 2; grid-row: 1 / span 2; color: var(--muted); line-height: 1.65; }
.movement-family-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr));
  align-items: start;
  gap: 14px;
}
.movement-family, .movement-family-single { border: 1px solid var(--ink); background: var(--paper); }
.movement-family {
  min-width: 0;
  display: flex;
  flex-direction: column;
}
.movement-family summary { min-height: 92px; padding: 18px 22px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 18px; cursor: pointer; list-style: none; }
.movement-family summary::-webkit-details-marker { display: none; }
.movement-family summary > span, .movement-family-label { color: var(--teal); font: 600 9px/1 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.movement-family summary strong { font-size: 22px; }
.movement-family summary small { color: var(--muted); font: 500 9px/1 var(--mono); text-transform: uppercase; }
.movement-family[open] summary { border-bottom: 1px solid var(--ink); background: var(--lime); }
.movement-family .muscle-region-grid {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  flex: 1;
}
.movement-family .knowledge-card-media {
  height: clamp(172px, 16vw, 204px);
}
.movement-family .knowledge-card-media img {
  padding: 4px 8px;
}
.movement-family-single { padding: 18px; }
.movement-family-single > .knowledge-card { margin-top: 12px; border: 1px solid var(--ink); }

.neck-visual-directory { padding-top: 24px; }

@media (max-width: 860px) {
  .muscle-tools { align-items: stretch; flex-direction: column; }
  .muscle-action-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .muscle-region-grid { grid-template-columns: repeat(2, 1fr); }
  .muscle-path-heading { grid-template-columns: 1fr; gap: 12px; }
  .movement-results-heading { grid-template-columns: 1fr; gap: 14px; }
  .movement-results-heading > p:last-child { grid-column: 1; grid-row: auto; }
  .movement-family-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .knowledge-cta h2 { font-size: 42px; overflow-wrap: anywhere; }
  .muscle-tools { align-items: stretch; flex-direction: column; }
  .muscle-tool-selects { align-items: stretch; flex-direction: column; min-width: 0; width: 100%; }
  .muscle-sort,
  .muscle-function,
  .muscle-visual { width: 100%; min-width: 0; }
  .muscle-reset { width: 100%; }
  .muscle-group-filter-shell { min-width: 0; max-width: 100%; }
  .muscle-group-filters { flex-wrap: wrap; }
  .muscle-group-filters button { flex: 0 1 auto; max-width: 100%; min-height: 44px; line-height: 1.4; padding: 8px 11px; }
  .muscle-region-section + .muscle-region-section { margin-top: 38px; }
  .muscle-region-heading { align-items: flex-start; flex-direction: column; gap: 9px; }
  .muscle-region-grid { grid-template-columns: 1fr; }
  .muscle-action-browser { padding: 18px; }
  .muscle-action-heading { grid-template-columns: 1fr; gap: 12px; }
  .muscle-action-grid { grid-template-columns: 1fr; }
  .muscle-selection-summary { align-items: flex-start; flex-wrap: wrap; }
  .muscle-selection-summary > span { width: 100%; margin-right: 0; }
  .muscle-action-disclosure > summary { grid-template-columns: 1fr auto; }
  .muscle-action-disclosure > summary small { display: none; }
  .movement-family summary { grid-template-columns: 1fr; gap: 8px; }
  .movement-family .knowledge-card-media { height: 164px; }
  .muscle-region-grid > .knowledge-card .knowledge-card-media { height: 164px; }
  .knowledge-card-media {
    height: 210px;
  }
  .muscle-collective-card .knowledge-card-media {
    height: 164px;
  }
  .anatomy-zoom-button { height: 300px; }
  .anatomy-viewer-panel { grid-template-columns: 1fr; }
  .anatomy-viewer-image { height: 58vh; }
  .anatomy-viewer-copy { padding: 24px; border-top: 1px solid var(--ink); border-left: 0; }
  .muscle-relationship-grid { grid-template-columns: 1fr; }
}

/* Muscle reference page */
body.knowledge-detail-open .knowledge-directory { display: none; }

body.muscle-directory-mode:not(.knowledge-detail-open) .knowledge-directory {
  padding-top: 58px;
  border-top: 0;
}

body.muscle-directory-mode:not(.knowledge-detail-open) .directory-heading {
  padding-bottom: 34px;
  border-bottom: 1px solid var(--ink);
}

body.muscle-directory-mode:not(.knowledge-detail-open) .directory-heading h2 {
  max-width: 820px;
  font-size: clamp(44px, 5.4vw, 72px);
}

body.muscle-directory-mode:not(.knowledge-detail-open) .knowledge-filters { margin-top: 24px; }

body.knowledge-detail-open .knowledge-detail {
  padding-top: 34px;
  background:
    linear-gradient(90deg, transparent 0, transparent calc(50% - .5px), color-mix(in srgb, var(--line) 52%, transparent) 50%, transparent calc(50% + .5px));
}

.is-muscle-detail .detail-back {
  min-height: 42px;
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--ink);
  background: var(--paper);
  font-size: 12px;
  text-decoration: none;
  transition: background .18s ease, color .18s ease, transform .18s ease;
}

.is-muscle-detail .detail-back:hover,
.is-muscle-detail .detail-back:focus-visible {
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-2px);
}

.is-muscle-detail .detail-layout {
  grid-template-columns: minmax(420px, 1fr) minmax(460px, 1fr);
  gap: clamp(44px, 7vw, 96px);
  margin-top: 42px;
  align-items: start;
}

.is-muscle-detail .detail-intro {
  position: sticky;
  top: 126px;
  padding-top: 18px;
}

.is-muscle-detail .detail-intro::before {
  content: "";
  width: 54px;
  height: 7px;
  display: block;
  margin-bottom: 28px;
  background: var(--lime);
  box-shadow: 0 0 0 1px var(--ink);
}

.is-muscle-detail .detail-layout h2 {
  max-width: 720px;
  margin-top: 18px;
  font-size: clamp(48px, 4.8vw, 68px);
  line-height: .88;
  overflow-wrap: normal;
  word-break: normal;
}

.detail-muscle-meta {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.detail-muscle-meta span {
  padding: 7px 9px;
  border: 1px solid var(--ink);
  background: transparent;
  font: 600 9px/1 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.detail-muscle-meta span:first-child { background: var(--ink); color: var(--paper); }

.is-muscle-detail .detail-summary {
  max-width: 620px;
  margin-top: 26px;
  font-size: 17px;
  line-height: 1.65;
}

.is-muscle-detail .detail-facts {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.is-muscle-detail .detail-anatomy-image { order: 1; margin-bottom: 18px; box-shadow: 8px 8px 0 color-mix(in srgb, var(--ink) 10%, transparent); }
.is-muscle-detail .detail-movement-functions { order: 2; margin-bottom: 18px; padding: 24px; background: var(--ink); color: var(--paper); }
.is-muscle-detail .detail-movement-functions .detail-kicker { color: var(--lime); }
.is-muscle-detail .detail-movement-functions h3 { margin-bottom: 18px; font-size: 34px; }
.is-muscle-detail .detail-movement-functions .muscle-role { border-color: var(--paper); background: var(--lime); color: var(--ink); }
.is-muscle-detail .detail-action-notes { color: #d0cec5; }
.is-muscle-detail .detail-fields { order: 3; margin-top: 10px; }
.is-muscle-detail .detail-disclaimer { order: 4; border-left: 5px solid var(--lime); }
.is-muscle-detail .detail-source { order: 5; }

.is-muscle-detail .detail-field {
  grid-template-columns: 132px 1fr;
  padding: 20px 0;
}

.is-muscle-detail .detail-field dt { color: var(--muted); }
.is-muscle-detail .detail-field dd { font-size: 14px; }

body.knowledge-detail-open .knowledge-cta { padding: 64px 0; }
body.knowledge-detail-open .knowledge-cta h2 { font-size: clamp(42px, 5vw, 68px); }

@media (max-width: 860px) {
  body.knowledge-detail-open .knowledge-detail { background: none; }
  .is-muscle-detail .detail-layout { grid-template-columns: 1fr; gap: 34px; }
  .is-muscle-detail .detail-intro { position: static; }
  .is-muscle-detail .detail-layout h2 { max-width: 100%; }
}

@media (max-width: 560px) {
  body.knowledge-detail-open .knowledge-detail { padding-top: 20px; padding-bottom: 84px; }
  .is-muscle-detail .detail-layout { margin-top: 28px; }
  .is-muscle-detail .detail-intro { padding-top: 8px; }
  .is-muscle-detail .detail-intro::before { margin-bottom: 20px; }
  .is-muscle-detail .detail-layout h2 { font-size: clamp(42px, 13vw, 56px); overflow-wrap: anywhere; }
  .is-muscle-detail .detail-summary { font-size: 15px; }
  .is-muscle-detail .detail-anatomy-image { box-shadow: none; }
  .is-muscle-detail .detail-field { grid-template-columns: 1fr; gap: 8px; }
  body.knowledge-detail-open .knowledge-cta { padding: 48px 0; }
}
/* Public six-region navigation, matching the site's body-region pages. */
.muscle-function-browse { order: 3; min-height: 44px; padding: 10px 16px; border: 1px solid var(--ink); background: var(--paper); color: var(--ink); font-weight: 700; cursor: pointer; }
.muscle-function-browse[hidden] { display: none; }
.muscle-function-browse:hover, .muscle-function-browse[aria-expanded="true"] { background: var(--ink); color: var(--paper); }
body.muscle-directory-mode:not(.knowledge-detail-open) .directory-heading h2 { font-size: 24px; letter-spacing: -.035em; }
body.muscle-directory-mode:not(.knowledge-detail-open) .directory-heading { padding-bottom: 20px; border-bottom: 1px solid var(--line); }
body.muscle-directory-mode .muscle-tools { padding: 36px 0 0; border: 0; background: transparent; }
body.muscle-directory-mode .muscle-path-heading { border: 0; padding: 0; gap: 48px; }
body.muscle-directory-mode .muscle-path-heading h3 { margin: 18px 0 22px; font-size: clamp(38px, 5vw, 64px); font-weight: 850; line-height: 1.02; letter-spacing: -.045em; text-transform: uppercase; overflow-wrap: anywhere; }
body.muscle-directory-mode #muscleRegionDescription { max-width: 720px; color: var(--muted); font-size: 17px; line-height: 1.65; }
body.muscle-directory-mode .muscle-region-note { padding-left: 18px; border-left: 2px solid var(--lime); }
body.muscle-directory-mode .muscle-region-filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 24px; }
body.muscle-directory-mode .muscle-region-filters button { min-height: 46px; padding: 12px; font: 600 10px/1.4 var(--mono); text-transform: uppercase; }
body.muscle-directory-mode .muscle-region-filters [data-region-count] { display: none; }
body.muscle-directory-mode .muscle-selection-summary { background: transparent; color: var(--ink); border: 0; border-top: 1px solid var(--line); padding: 18px 0 0; min-height: 0; justify-content: flex-start; flex-wrap: wrap; }
body.muscle-directory-mode .muscle-selection-summary > span { margin-right: 12px; color: var(--muted); }
body.muscle-directory-mode .muscle-selection-summary b,
body.muscle-directory-mode .muscle-selection-summary strong.is-selected { color: var(--ink); }
@media (max-width: 700px) {
  body.muscle-directory-mode .muscle-path-heading { grid-template-columns: minmax(0, 1fr); gap: 22px; }
  body.muscle-directory-mode .muscle-region-filters { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); width: 100%; }
  body.muscle-directory-mode .muscle-region-filters button { justify-content: center; }
}