diff --git a/PENDIENTE.md b/PENDIENTE.md
index 69855d6..9791e6f 100644
--- a/PENDIENTE.md
+++ b/PENDIENTE.md
@@ -68,11 +68,17 @@ React 19: el `<Blaze serverFacts>` de Status.js (`findDOMNode`), solo en `/statu
 - **Salto Bootstrap 4→5 (CSS/JS) pendiente:** react-bootstrap ya está en v2 y
   corre sobre el CSS Bootstrap 4 actual (`alexwine:bootstrap-4`) con un único
   shim `.form-label` en `forms.scss`. El salto a Bootstrap 5 npm está diferido
-  porque el carrusel del home (`bootstrap-carousel-swipe`, jQuery/BS4) y el
-  collapse del navbar dependen del JS jQuery de BS4 (`data-toggle`, `data-slide`).
-  Al hacerlo: importar `bootstrap@5` SCSS+JS, reescribir el carrusel (BS5 trae
-  swipe nativo → quitar el plugin), `data-toggle`→`data-bs-toggle`,
-  `ml-auto`→`ms-auto`, revisar `new-age.scss`/`custom.scss`/`bootstrap-overrides.scss`.
+  porque el carrusel del home (`bootstrap-carousel-swipe`, jQuery/BS4) depende del
+  JS jQuery de BS4 (`data-slide`).
+  - ✅ **Collapse del navbar migrado a React** (`Navigation.js` + `NavItem.js`):
+    el `data-toggle="collapse"` jQuery se sustituyó por estado React (`useState`
+    que alterna `.show`); funciona ya sobre el CSS BS4 y no depende del JS jQuery.
+    *Verificar en staging el menú móvil (<lg): abrir/cerrar y cierre al pulsar un
+    enlace.* Un blocker jQuery menos.
+  - Falta: reescribir el carrusel (BS5 trae swipe nativo → quitar el plugin),
+    importar `bootstrap@5` SCSS+JS, `data-slide`→`data-bs-slide`,
+    `ml-auto`→`ms-auto`, `sr-only`→`visually-hidden`, revisar
+    `new-age.scss`/`custom.scss`/`bootstrap-overrides.scss`.
 - **Limpieza menor:** migración 217 `// TODO remove falsepositives lowercase
   collection`; `prerender.js` gating comentado; sección per-fire del sitemap
   eliminada (era código muerto tras `firesMapEnabled=false`).
diff --git a/imports/ui/components/NavItem/NavItem.js b/imports/ui/components/NavItem/NavItem.js
index a3bbad0..9467868 100644
--- a/imports/ui/components/NavItem/NavItem.js
+++ b/imports/ui/components/NavItem/NavItem.js
@@ -4,7 +4,9 @@ import PropTypes from 'prop-types';
 
 // Self-contained NavItem. The old one wrapped react-bootstrap 0.31's
 // `SafeAnchor` + `createChainedFunction` (both gone in v2); the markup this
-// navbar needs is just an <li><a> that toggles the collapsed menu on click.
+// navbar needs is just an <li><a>. The mobile menu is now collapsed from React
+// state in Navigation (the parent <ul onClick>), so the old jQuery
+// `data-toggle="collapse"` / `data-target` hooks were dropped here.
 const propTypes = {
   active: PropTypes.bool,
   disabled: PropTypes.bool,
@@ -57,8 +59,6 @@ class NavItem extends React.Component {
     return (
       <li
         role="presentation"
-        data-toggle="collapse"
-        data-target=".navbar-collapse.show"
         className={classNames(className, { active, disabled })}
         style={style}
       >
diff --git a/imports/ui/components/Navigation/Navigation.js b/imports/ui/components/Navigation/Navigation.js
index 15b1c11..599b92c 100644
--- a/imports/ui/components/Navigation/Navigation.js
+++ b/imports/ui/components/Navigation/Navigation.js
@@ -15,44 +15,51 @@ import './Navigation.scss';
 
 // removed class: fixed-top
 // md instead of lg: no menu in medium
-const Navigation = ({ name = '', ...props }) => (
-  <nav className="navbar navbar-expand-lg navbar-dark bg-dark">
-    <div style={{ overflow: 'hidden' } /* for ribbon */} className="container">
-      {/* <BetaRibbon /> */}
-      <Link to="/" className={`navbar-brand ${window.location.pathname === '/' ? 'hide-brand' : ''}`} >
-        {props.t('AppNameFull')}
-      </Link>
-      <button className="sr-only navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
-        <span className="navbar-toggler-icon" />
-      </button>
-      <button className="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
-        <span className="navbar-toggler-icon" />
-      </button>
-      {/* <Navbar.Collapse> */}
-      <div className="collapse navbar-collapse" id="navbarNavDropdown">
-        <ul className="navbar-nav ml-auto ">
-          {/* <LinkContainer className="nav-item" anchorClassName="nav-link" to="/sandbox">
-          <NavItem eventKey={1.1} href="/sandbox">Sandbox</NavItem>
-          </LinkContainer> */}
-          <LinkContainer id={testId('subscriptions')} className="nav-item" anchorClassName="nav-link" to="/subscriptions">
-            <NavItem eventKey={1.2} href="/subscriptions">
-              {props.authenticated ? <Trans>Mis zonas</Trans> : <Trans>Participar</Trans>}
-            </NavItem>
-          </LinkContainer>
-          <LinkContainer id={testId('moniZones')} className="nav-item" anchorClassName="nav-link" to="/zones">
-            <NavItem eventKey={2} href="/zones">{props.t('Zonas vigiladas')}</NavItem>
-          </LinkContainer>
-          <LinkContainer id={testId('activeFires')} className="nav-item" anchorClassName="nav-link" to="/fires">
-            <NavItem eventKey={2.1} href="/fires">{props.t('activeFires')}</NavItem>
-          </LinkContainer>
+//
+// Bootstrap 4→5 prep: the collapse used to be driven by Bootstrap's jQuery JS
+// (`data-toggle="collapse"`), which goes away when we drop `alexwine:bootstrap-4`
+// for `bootstrap@5`. Toggling the `.show` class from React state removes that
+// dependency and keeps working on the current BS4 CSS (`.collapse.show` is pure
+// CSS; jQuery only added the height animation). Clicking a nav link collapses the
+// mobile menu again — the old per-NavItem `data-target=".navbar-collapse.show"`.
+const Navigation = ({ name = '', ...props }) => {
+  const [open, setOpen] = React.useState(false);
+  const close = () => setOpen(false);
+  return (
+    <nav className="navbar navbar-expand-lg navbar-dark bg-dark">
+      <div style={{ overflow: 'hidden' } /* for ribbon */} className="container">
+        {/* <BetaRibbon /> */}
+        <Link to="/" className={`navbar-brand ${window.location.pathname === '/' ? 'hide-brand' : ''}`} >
+          {props.t('AppNameFull')}
+        </Link>
+        <button className="navbar-toggler" type="button" onClick={() => setOpen(o => !o)} aria-controls="navbarNavDropdown" aria-expanded={open} aria-label="Toggle navigation">
+          <span className="navbar-toggler-icon" />
+        </button>
+        <div className={`collapse navbar-collapse${open ? ' show' : ''}`} id="navbarNavDropdown">
+          {/* onClick closes the mobile menu when a main nav link is tapped */}
+          <ul className="navbar-nav ml-auto " onClick={close}>
+            {/* <LinkContainer className="nav-item" anchorClassName="nav-link" to="/sandbox">
+            <NavItem eventKey={1.1} href="/sandbox">Sandbox</NavItem>
+            </LinkContainer> */}
+            <LinkContainer id={testId('subscriptions')} className="nav-item" anchorClassName="nav-link" to="/subscriptions">
+              <NavItem eventKey={1.2} href="/subscriptions">
+                {props.authenticated ? <Trans>Mis zonas</Trans> : <Trans>Participar</Trans>}
+              </NavItem>
+            </LinkContainer>
+            <LinkContainer id={testId('moniZones')} className="nav-item" anchorClassName="nav-link" to="/zones">
+              <NavItem eventKey={2} href="/zones">{props.t('Zonas vigiladas')}</NavItem>
+            </LinkContainer>
+            <LinkContainer id={testId('activeFires')} className="nav-item" anchorClassName="nav-link" to="/fires">
+              <NavItem eventKey={2.1} href="/fires">{props.t('activeFires')}</NavItem>
+            </LinkContainer>
 
-        </ul>
-        {!props.authenticated ? <PublicNavigation /> : <AuthenticatedNavigation name={name} {...props} />}
-        {/* </Navbar.Collapse> */}
+          </ul>
+          {!props.authenticated ? <PublicNavigation /> : <AuthenticatedNavigation name={name} {...props} />}
+        </div>
       </div>
-    </div>
-  </nav>
-);
+    </nav>
+  );
+};
 
 Navigation.propTypes = {
   t: PropTypes.func.isRequired,