/* Cervical, lumbar and sacral plexus teaching app. Follows DESIGN.md: warm paper,
   ink, one wine accent, square edges, hairlines, light only. Anatomy and block
   status colours are clinical codes and stay as they are. */
.px {
  --bg: #f7f5ef; --surface: #f7f5ef; --surface-2: #eee9df; --panel: #eeece5; --hover: #e9e5dc; --blush: #e8ded7;
  --text: #272722; --ink-soft: #504e47; --muted: #55534d; --primary: #633d3c; --primary-hover: #4b2e2d;
  --on-primary: #fffaf0; --border: #d7d2c8; --line-strong: #8f8574; --control-line: #827b6d; --focus: #633d3c;
  /* Block status: shared regional tokens (shared/regional/css/status.css), with fallbacks. */
  --st-target: var(--ra-st-target, #166534); --st-covers: var(--ra-st-covers, #16a34a); --st-variable: var(--ra-st-variable, #c2410c); --st-spares: var(--ra-st-spares, #94a3b8); --st-halo: var(--ra-st-halo, #633d3c);
  --px-bar: 55px;
  --font: 'NTF Sans', Inter, Arial, sans-serif;
  --radius: 0;
  background: var(--bg); color: var(--text); font: 17px/1.6 var(--font); margin: 0; overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
.px *, .px *::before, .px *::after { box-sizing: border-box; }
.px a { color: var(--primary); text-underline-offset: 2px; }
.px a:hover { color: var(--primary-hover); }
.px :focus-visible { outline: 2px solid var(--focus); outline-offset: 4px; }
.px button { font: inherit; color: inherit; }
.px .sr-only, .px .sr-status { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.px .skip { position: absolute; left: 12px; top: -60px; z-index: 100; min-height: 44px; background: var(--primary); color: var(--on-primary); padding: 8px 14px; text-decoration: none; }
.px .skip:focus { top: 12px; color: var(--on-primary); }
.px .noscript { padding: 16px; }
.px .px-muted { color: var(--muted); }

/* ------------------------------------------------------------ app bar: the regional app's bar (shared/regional/css/regional.css,
   tb- classes, built in index.html). The explorer's own toolbar (plexus tabs and block chips) sits at the top of main. */
body.px.ra-app .ntf-header { position: relative; z-index: 60; } /* scrolls away; its phone menu stays above the bar and the page */
.px .tb-bar .tb-chlist a[aria-current=page] { color: var(--text); border-bottom-color: var(--primary); font-weight: 500; }
@media (max-width: 600px) { .px .px-cur-block { display: none; } }
.px .tb-sres-none { padding: 10px 12px; color: var(--muted); font-size: 15px; }
.px .px-ex-bar .chips.app-chips { flex-wrap: wrap; overflow-x: visible; margin-inline: 0; padding-inline: 0; }
/* Plexus switcher: the app kit's segmented control (radios in a fieldset). Block chips: the kit's pill chips. */
.px .px-tabs.app-segmented { margin: 0; flex: 0 0 auto; min-width: 360px; }
.px .px-tabs .app-seg span { padding: 0 14px; font-size: var(--app-t-subhead); }
.px .px-blockrow { display: flex; align-items: center; gap: 10px; min-width: 0; flex: 1 1 320px; }
.px .blockbar-label { font: 400 12px/1.3 'NTF Mono', ui-monospace, monospace; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); flex-shrink: 0; }
.px .chips.app-chips { gap: var(--app-s2); min-width: 0; margin-block: 0; }
.px .app-chip { background: transparent; border: 0; }
.px .app-chip .chip-main { font: inherit; }
@media (max-width: 759px) {
  .px .px-ex-bar .chips.app-chips { flex-wrap: nowrap; overflow-x: auto; margin-inline: 0 calc(-1 * var(--app-gutter)); padding-inline: 0 var(--app-gutter); }
  .px .px-ex-bar .px-tabs.app-segmented { width: 100%; min-width: 0; }
  .px .px-ex-bar .px-blockrow { flex-basis: 100%; }
}

/* Page heading (inside main, in the regional pages' hero style) */
.px .px-head { padding: 8px 0 6px; }
.px main .px-head h1 { margin: 0 0 12px; font: 400 clamp(30px, 4vw, 46px)/1.12 'NTF Serif', Georgia, serif; letter-spacing: -.03em; text-wrap: balance; max-width: 30ch; }
.px .px-head .tb-lead { margin-bottom: 10px; }
.px .px-head .tb-credit { margin-bottom: 4px; }
#px-level-picker:empty { display: none; }
.px .px-more { margin: 12px 0 0; font-size: 15px; }

/* ------------------------------------------------------------ layout */
/* main and the footer use the site container, like the bar and the other regional pages */
.px main { padding-top: 16px; padding-bottom: 32px; }
.px main [id] { scroll-margin-top: calc(var(--px-bar) + 8px); }
.px .tb-foot.foot { padding: 0; }
.px .intro { margin: 0 0 12px; color: var(--muted); max-width: 68ch; font-size: 16px; line-height: 1.6; }
.px .intro:empty { display: none; }
.px .px-legend { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 16px; margin: 0 0 12px; padding: 8px 12px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--surface-2); font-size: 15px; }
.px .px-legend[hidden] { display: none; }
.px .px-legend-title { font-weight: 600; }
.px .px-key { display: inline-flex; align-items: center; gap: 6px; }
/* Status keys drawn like the diagram: target thick with a wine halo, covers solid, variable beaded, spares thin dashed and faded. */
.px .px-stkey { flex-shrink: 0; overflow: visible; }
.px .px-stkey line { stroke-linecap: round; fill: none; }
.px .px-stkey .m { stroke: #b9b2a3; stroke-width: 3; }
.px .px-stkey[data-status="target"] .h { stroke: var(--st-halo); stroke-opacity: .4; stroke-width: 9; }
.px .px-stkey[data-status="target"] .m { stroke: var(--st-target); stroke-width: 4.5; }
.px .px-stkey[data-status="covers"] .m { stroke: var(--st-covers); stroke-width: 3.5; }
.px .px-stkey[data-status="variable"] .u { stroke: rgba(194, 65, 12, .38); stroke-width: 6; }
.px .px-stkey[data-status="variable"] .m { stroke: var(--st-variable); stroke-width: 3.5; stroke-dasharray: .01 6; }
.px .px-stkey[data-status="spares"] .m { stroke: var(--st-spares); stroke-width: 2.5; stroke-dasharray: 2 3.5; stroke-opacity: .7; }

.px .stage { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; margin-bottom: 14px; }
@media (min-width: 900px) {
  /* Equal halves: in the site container (about 1130px) the diagram panel is then wide enough (520px+) to show whole. */
  .px .stage { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; }
}
.px .panel { background: var(--surface); border: 1px solid var(--border); border-radius: 0; min-width: 0; }
.px .panel-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 4px 6px 4px 14px; border-bottom: 1px solid var(--border); background: var(--surface-2); }
.px .panel.is-collapsed .panel-head { border-bottom: 0; }
.px .panel-head h2 { margin: 0; font: 400 20px/1.3 'NTF Serif', Georgia, serif; letter-spacing: -.01em; }
.px .collapse-btn { width: 44px; height: 44px; display: grid; place-items: center; border: 1px solid transparent; border-radius: 0; background: transparent; cursor: pointer; color: var(--muted); }
.px .collapse-btn:hover { border-color: var(--border); color: var(--text); }
.px .collapse-btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; transition: transform .2s; }
.px .collapse-btn[aria-expanded="false"] svg { transform: rotate(-90deg); }
.px .panel-body { min-width: 0; }
.px .panel-body[hidden] { display: none; }
.px .mount { min-width: 0; }
.px .mount-3d { height: 60vh; height: 60svh; min-height: 340px; max-height: 620px; display: flex; flex-direction: column; }
.px .mount-diagram { max-height: none; }
@media (min-width: 900px) {
  .px .mount-3d { height: 560px; }
  .px .mount-diagram { height: 560px; overflow: auto; }
}
.px .px-msg { margin: 0; padding: 16px; color: var(--muted); font-size: 15px; }

/* ------------------------------------------------------------ 3D viewer */
.px .px-v3 { display: flex; flex-direction: column; height: 100%; min-height: 0; }
.px .px-v3-bar { position: relative; z-index: 4; display: flex; align-items: center; justify-content: space-between; gap: 6px; padding: 6px 8px; border-bottom: 1px solid var(--border); }
.px .px-v3-group { display: flex; gap: 4px; min-width: 0; overflow-x: auto; scrollbar-width: none; overscroll-behavior-x: contain; }
.px .px-v3-group::-webkit-scrollbar { display: none; }
/* Phones: the view buttons and "Layers" share one wrapping toolbar (rows filled edge to edge) instead of a
   scroller under a pinned "Layers", so Back and Reset are never hidden. */
@media (max-width: 599px) {
  .px .px-v3-bar { flex-wrap: wrap; justify-content: flex-start; gap: 4px; }
  .px .px-v3-group { display: contents; }
  .px .px-v3-group .px-v3-btn { flex: 1 1 auto; padding: 4px 8px; }
  .px .px-v3-layers { flex: 1 1 auto; display: flex; }
  .px .px-v3-layers-btn { flex: 1 1 auto; justify-content: center; padding: 4px 10px; }
}
.px .px-v3-btn { flex-shrink: 0; min-height: 44px; padding: 4px 12px; border: 1px solid var(--border); border-radius: 0; background: var(--surface); color: var(--text); cursor: pointer; font-size: 14px; font-weight: 500; white-space: nowrap; }
.px .px-v3-btn:hover { background: var(--hover); }
.px .px-v3-layers { position: relative; flex-shrink: 0; }
.px .px-v3-layers-btn { display: inline-flex; align-items: center; gap: 4px; border-color: var(--control-line); }
.px .px-v3-layers-btn svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; transition: transform .15s; }
.px .px-v3-layers-btn[aria-expanded="true"] { background: var(--hover); border-color: var(--primary); }
.px .px-v3-layers-btn[aria-expanded="true"] svg { transform: rotate(180deg); }
.px .px-v3-menu { position: absolute; top: calc(100% + 4px); right: 0; z-index: 6; display: grid; gap: 0; min-width: 210px; max-width: calc(100vw - 32px); padding: 4px 0; background: var(--bg); border: 1px solid var(--line-strong); box-shadow: 0 10px 18px rgba(39, 39, 34, .12); }
.px .px-v3-menu[hidden] { display: none; }
.px .px-v3-toggle { display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 0 14px; border: 0; background: none; cursor: pointer; font-size: 15px; text-align: left; }
.px .px-v3-toggle:hover { background: var(--hover); }
.px .px-v3-check { width: 18px; height: 18px; flex-shrink: 0; border: 1.5px solid var(--control-line); background: var(--bg); }
.px .px-v3-toggle[aria-pressed="true"] .px-v3-check { background: var(--primary) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Cpath d='M4 9.5l3.2 3L14 5.5' fill='none' stroke='%23fffaf0' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/100% no-repeat; border-color: var(--primary); }
.px .px-v3-stage { position: relative; isolation: isolate; flex: 1; min-height: 0; overflow: hidden; background: radial-gradient(ellipse at 50% 40%, #fbfaf6 0%, #eee9df 100%); }
.px .px-v3-canvas, .px .px-v3-canvas canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }
.px .px-v3-canvas canvas:focus-visible { outline-offset: -3px; }
.px .px-v3-labels { position: absolute; inset: 0; pointer-events: none; }
.px .px-v3-labwrap { pointer-events: none; }
.px .px-v3-label { display: inline-block; transition: transform .12s; padding: 1px 6px; background: rgba(247, 245, 239, .92); border: 1px solid var(--border); color: var(--text); font-size: 13px; font-weight: 600; white-space: nowrap; line-height: 1.4; }
.px .px-v3-label.is-dim { opacity: .35; }
.px .px-v3-label.is-nudged { box-shadow: -6px 0 0 -5px var(--line-strong); }
.px .px-v3-label.is-sel { border-color: var(--primary); font-size: 14px; }
.px .px-v3-tip { position: absolute; left: 0; top: 0; z-index: 3; pointer-events: none; padding: 4px 8px; background: #272722; color: #fffaf0; font-size: 14px; white-space: nowrap; }
.px .px-v3-tip[hidden] { display: none; }
.px .px-v3-status { position: absolute; left: 10px; bottom: 8px; margin: 0; padding: 4px 8px; background: rgba(247, 245, 239, .9); color: var(--muted); font-size: 14px; pointer-events: none; }
.px .px-v3-status[hidden] { display: none; }
.px .px-v3-hint { margin: 0; padding: 6px 10px; border-top: 1px solid var(--border); color: var(--muted); font-size: 13px; line-height: 1.45; }
@media (max-width: 899px) { .px .px-v3-hint { display: none; } }

/* ------------------------------------------------------------ diagram */
.px .px-dg { padding: 4px 0 8px; }
.px .px-dg-tools { display: none; align-items: center; justify-content: space-between; gap: 8px; padding: 2px 8px 6px 10px; }
.px .px-dg.is-narrow .px-dg-tools { display: flex; }
.px .px-dg-hint { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.4; }
.px .px-dg-scroll { overflow-x: auto; overscroll-behavior-x: contain; -webkit-overflow-scrolling: touch; touch-action: pan-x pan-y; }
.px .px-dg-svg { display: block; width: 100%; min-width: 520px; height: auto; font-family: var(--font); }
.px .px-dg.is-narrow:not(.is-zoomed) .px-dg-svg { min-width: 0; }
.px .px-dg-svg .col-head { fill: var(--text); font-weight: 700; }
.px .px-dg-svg .col-sub { fill: var(--muted); }
.px .px-dg-svg .col-sep { stroke: var(--border); stroke-dasharray: 3 7; }
.px .px-dg-svg .region { fill: rgba(99, 61, 60, .05); stroke: rgba(99, 61, 60, .22); stroke-dasharray: 6 6; }
.px .px-dg-svg .region-label { fill: var(--muted); font-style: italic; }
.px .px-dg-svg .note { fill: var(--muted); }
.px .px-dg-svg .band-area { fill: rgba(99, 61, 60, .06); stroke: rgba(99, 61, 60, .6); stroke-dasharray: 8 6; }
.px .px-dg-svg .band-label { fill: var(--primary); font-weight: 700; paint-order: stroke; stroke: var(--bg); stroke-linejoin: round; }
.px .px-dg-svg .el { cursor: pointer; outline: none; transition: opacity .15s; }
.px .px-dg-svg .el .halo { fill: none; stroke: transparent; stroke-linecap: round; stroke-linejoin: round; }
.px .px-dg-svg .el .edge, .px .px-dg-svg .el .main { fill: none; stroke-linecap: round; stroke-linejoin: round; }
.px .px-dg-svg .el .hit { fill: none; stroke: transparent; stroke-linecap: round; pointer-events: stroke; }
.px .px-dg-svg .el .lbl { fill: var(--text); paint-order: stroke; stroke: var(--bg); stroke-width: calc(3px * var(--px-k, 1)); stroke-linejoin: round; }
.px .px-dg-svg .el .t-root { font-weight: 800; stroke: none; }
.px .px-dg-svg .el .t-struct { font-weight: 700; }
.px .px-dg-svg .el .t-term { font-weight: 700; }
.px .px-dg-svg .el .t-branch { font-weight: 500; }
.px .px-dg-svg .el .t-sub { font-weight: 400; fill: var(--muted); }
.px .px-dg-svg .el .badge { stroke: rgba(39, 39, 34, .35); stroke-width: calc(1px * var(--px-k, 1)); }
.px .px-dg-svg .el.is-related .lbl { fill: var(--ink-soft); font-style: italic; }
.px .px-dg-svg .el[data-status="target"] .halo { stroke: rgba(99, 61, 60, .42); }
.px .px-dg-svg .el.is-hover .halo { stroke: rgba(232, 185, 35, .35); }
.px .px-dg-svg .el.is-selected .halo { stroke: rgba(99, 61, 60, .28); }
.px .px-dg-svg .el.is-selected .lbl:not(.t-root) { fill: var(--primary); text-decoration: underline; }
.px .px-dg-svg .el:focus-visible .halo { stroke: rgba(99, 61, 60, .45); }
.px .px-dg-svg .el.is-dim { opacity: .22; }
.px .px-dg-svg .el.is-dim.is-hover { opacity: .6; }

/* ------------------------------------------------------------ info panel */
.px .px-info { padding: 4px 16px 16px; }
.px .px-info .px-card { padding: 12px 0 14px; border-bottom: 1px solid var(--border); max-width: 100%; }
.px .px-info .px-card:last-of-type { border-bottom: 0; }
.px .px-kicker { margin: 0 0 2px; font: 400 12px/1.5 'NTF Mono', ui-monospace, monospace; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.px .px-info h3 { margin: 0 0 8px; font: 400 26px/1.2 'NTF Serif', Georgia, serif; letter-spacing: -.01em; text-wrap: balance; }
.px .px-info h4 { display: flex; align-items: center; gap: 8px; margin: 12px 0 6px; font-size: 13px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.px .px-info p { margin: 0 0 8px; max-width: 68ch; }
.px .px-roots { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.px .px-roots-label { font-size: 13px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); margin-right: 4px; }
.px .px-level { display: inline-block; min-width: 34px; padding: 1px 8px; text-align: center; font-weight: 700; font-size: 14px; border: 1px solid rgba(39, 39, 34, .35); }
.px .px-kv { margin: 0 0 8px; display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 6px 14px; }
.px .px-kv > div { display: contents; }
.px .px-kv dt { font-size: 13px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); padding-top: 3px; }
.px .px-kv dd { margin: 0; }
.px .px-chips { display: flex; flex-wrap: wrap; gap: 6px; }
/* Nerve and block chips in the details: app-kit pills. Status chips lead with a short stroke drawn like the diagram
   (target thick with a wine halo, covers solid, variable dotted, spares dashed), so status is never colour alone. */
.px .px-chip { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; padding: 4px 14px; border: 0; border-radius: var(--app-r-full, 999px); background: var(--app-surface, var(--surface));
  box-shadow: inset 0 0 0 1px var(--app-control, var(--control-line)); cursor: pointer; font-size: 15px; text-align: left; transition: transform var(--app-d-press, 90ms) var(--app-ease, ease); }
.px .px-chip:hover { background: var(--hover); }
.px .px-chip:active { transform: scale(.96); background: var(--app-pressed, var(--hover)); }
.px .px-chip[aria-pressed="true"] { background: var(--app-blush, var(--blush)); box-shadow: inset 0 0 0 1.5px var(--app-wine, var(--primary)); color: var(--app-wine, var(--primary)); font-weight: 600; }
.px .px-chip.is-text { cursor: default; color: var(--muted); box-shadow: none; }
.px .px-chip[class*="st-"] { padding-left: 12px; }
.px .px-chip[class*="st-"]::before { content: ""; flex: none; width: 16px; height: 0; border-top: 3px solid currentColor; border-radius: 2px; }
.px .px-chip.st-target::before { border-top-width: 5px; border-top-color: var(--st-target); box-shadow: 0 0 0 2px color-mix(in srgb, var(--st-halo) 40%, transparent); }
.px .px-chip.st-covers::before { border-top-color: var(--st-covers); }
.px .px-chip.st-variable::before { border-top-style: dotted; border-top-color: var(--st-variable); }
.px .px-chip.st-spares::before { border-top-style: dashed; border-top-color: var(--st-spares); }
.px .px-chip-sub { color: var(--muted); font-size: 13px; margin-left: 6px; }
.px .px-tiered { margin: 10px 0 8px; }
.px .px-tiered .ra-tier-badge { margin-bottom: 4px; }
.px .px-hint { margin: 0 16px 16px; }
.px .px-note { padding: 6px 12px; border-left: 3px solid var(--line-strong); background: var(--surface-2); font-size: 15px; }
.px .px-actions { margin: 10px 0 0; }
.px .px-link-btn { appearance: none; border: 0; background: none; padding: 10px 0; min-height: 44px; color: var(--primary); font-weight: 500; font-size: 15px; text-decoration: underline; text-underline-offset: 2px; cursor: pointer; }
@media (min-width: 900px) {
  .px .px-info { display: grid; grid-template-columns: repeat(auto-fit, minmax(380px, 1fr)); gap: 0 32px; }
  .px .px-info .px-card { border-bottom: 0; }
  .px .px-info .px-actions { grid-column: 1 / -1; }
}

/* ------------------------------------------------------------ footer block */
.px .foot { border-top: 1px solid var(--border); background: var(--surface); }
.px .foot-inner { padding-top: 18px; padding-bottom: 22px; color: var(--muted); font-size: 14px; line-height: 1.7; }
.px .px-credit { color: var(--text); }
.px .px-ex-credit { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
.px .px-ex-credit:empty { display: none; }
/* Site footer text never below 12px here. */
body.px .ntf-footer, body.px .ntf-footer * { font-size: max(12px, 1em); }
body.px .ntf-footer .ntf-copyright { font-size: 13px; }
.px .foot-inner p { margin: 0 0 6px; max-width: 110ch; }
.px .foot-inner p:empty { display: none; }
.px .disclaimer { color: var(--text); font-weight: 600; }

@media (max-width: 599px) {
  .px .px-head { padding-top: 16px; }
  .px .px-head + main { padding-top: 10px; }
  .px .px-kv { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .px .px-kv dd { margin-bottom: 6px; }
  .px .px-info { padding: 4px 14px 14px; }
  .px .px-info h3 { font-size: 23px; }
}
@media (prefers-reduced-motion: reduce) {
  .px *, .px *::before, .px *::after { transition: none !important; scroll-behavior: auto !important; }
}

/* ------------------------------------------------------------ explorer on other pages (own toolbar) */
.px.px-ex { background: transparent; font-size: 16px; overflow-x: visible; }
.px .px-ex-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; margin: 0 0 12px; }

/* ------------------------------------------------------------ embedded (iframe on a block page: ?embed=1) */
body.px-embed .ntf-header, body.px-embed .ntf-footer, body.px-embed .ntf-crumbs, body.px-embed .px-head, body.px-embed #px-level-picker,
body.px-embed .tb-skip, body.px-embed #tb-share, body.px-embed #tb-search-open, body.px-embed .tb-chmenu-extra, body.px-embed .px-back, body.px-embed .px-credit { display: none !important; }
body.px-embed main { padding-top: 10px; padding-bottom: 12px; }
body.px-embed .foot-inner { padding-top: 10px; padding-bottom: 12px; font-size: 13px; }
body.px-embed .tb-bar-home.is-out span { position: static; width: auto; height: auto; overflow: visible; clip: auto; }
body.px-embed .tb-bar-home.is-out { padding: 0 12px; }
/* The block page sizes the frame to this content, so nothing here may depend on the frame's own height (no vh). */
body.px-embed .px .intro { display: none; }
body.px-embed .px .mount-3d { height: 380px; min-height: 0; max-height: none; }
@media (min-width: 900px) { body.px-embed .px .mount-3d { height: 520px; } }

@media print {
  .px .tb-bar, .px .px-v3-bar, .px .px-dg-tools, .px .collapse-btn { display: none !important; }
}

/* ---------------------------------------------------------------- app kit (DESIGN-APP.md, assets/app/app.css)
   Controls follow the shared phone-app kit: segmented plexus switcher, pill chips, rounded buttons, panels and menus,
   press feedback. 3D views, diagrams, anatomy and block-status colours are unchanged. */

.px .panel { border: 0; border-radius: var(--app-r-lg); background: var(--app-surface); overflow: hidden; }
.px .panel-head { border-bottom: 1px solid var(--app-line); background: var(--app-surface); }
.px .collapse-btn { border-radius: var(--app-r-md); }
.px .collapse-btn:active { background: var(--app-pressed); }
.px .px-legend { border: 0; border-radius: var(--app-r-md); background: var(--app-inset); }
.px .px-note { border-radius: 0 var(--app-r-sm) var(--app-r-sm) 0; }

.px .px-v3-bar { gap: var(--app-s2) var(--app-s3); padding: var(--app-s2); }
.px .px-v3-group { gap: var(--app-s2); align-items: center; }
.px .px-v3-btn.app-btn { min-height: 44px; padding-inline: var(--app-s3); border: 0; border-radius: var(--app-r-md); font-size: var(--app-t-subhead); }
.px .px-v3-btn.app-btn--outline { background: var(--app-surface); box-shadow: inset 0 0 0 1px var(--app-control); }
.px .px-v3-btn.app-btn--outline:hover { background: var(--hover); }
.px .px-v3-btn.app-btn--plain { background: transparent; color: var(--app-wine); }
.px .px-v3-btn.app-btn--plain:hover { background: var(--app-pressed-ground); }
.px .px-v3-layers-btn[aria-expanded="true"] { background: var(--app-blush); box-shadow: inset 0 0 0 1.5px var(--app-wine); }
.px .px-v3-menu { border: 0; border-radius: var(--app-r-md); background: var(--app-surface); box-shadow: var(--app-shadow-float); padding: 6px 0; overflow: hidden; }
.px .px-v3-check { border-radius: var(--app-r-xs); }

@media (max-width: 759px) {
  .px .stage { padding-left: env(safe-area-inset-left); padding-right: env(safe-area-inset-right); }
}