Make the whole phrase agree

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<body class="spanish"><main><header><p class="kicker">35-minute Spanish lesson · four practice cards + two transfer cards</p><h1>Make the whole phrase agree</h1></header><div class="content"><div class="hero"><p>Model: <span lang="es">la carpeta roja → las carpetas rojas</span></p><p>Contrast: <span lang="es">la carpeta grande → las carpetas grandes</span></p><p>Written agreement · fictional object phrases</p></div><section><h2>Choose a phrase</h2><div class="controls"><button type="button" id="card0" aria-pressed="true" lang="es">Libro rojo</button><button type="button" id="card1" aria-pressed="false" lang="es">Carpeta roja</button><button type="button" id="card2" aria-pressed="false" lang="es">Libro grande</button><button type="button" id="card3" aria-pressed="false" lang="es">Carpeta grande</button><button type="button" id="card4" aria-pressed="false" lang="es">Transfer: cuaderno</button><button type="button" id="card5" aria-pressed="false" lang="es">Transfer: mesa</button></div><article class="stage"><p id="basis">libro: masculine singular · practice</p><h3 id="phrase" lang="es">el libro rojo</h3><label for="answer">Write the complete plural phrase<input id="answer" type="text" value="" lang="es" autocomplete="off"></label><div class="controls"><button type="button" id="check" >Check phrase</button><button type="button" id="reset" >Reset lesson</button></div><p id="result" class="result" role="status" aria-live="polite">Unanswered. Write the complete plural phrase.</p><label for="reason">Explain the agreement (teacher review)<textarea id="reason" rows="3"></textarea></label></article></section><section><h2>Proposed lesson sequence</h2><ol class="timeline"><li>5 min · identify article, noun, adjective</li><li>7 min · model red phrases</li><li>10 min · paired grande transformations</li><li>8 min · independent transfer</li><li>5 min · exit explanation</li></ol><p>Total: 35 minutes. Record assistance separately from independent work.</p><details><summary>Teacher phrase key</summary><p lang="es">los libros rojos · las carpetas rojas · los libros grandes · las carpetas grandes · los cuadernos rojos · las mesas grandes</p><p>Grande shares its gender form here; plural grandes. These are selected patterns, not every Spanish adjective. This local match does not assess pronunciation or grade explanations.</p></details></section></div><footer><p>Local example only. Controls send nothing and save no changes; reloading restores the sample. Keep your lesson notes separately.</p></footer><noscript>Enable JavaScript to use this interactive example.</noscript></main>
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const q=s=>document.querySelector(s);const put=(s,t)=>{q(s).textContent=t;};const on=(s,fn,event='click')=>q(s).addEventListener(event,fn);const esc=s=>String(s).replace(/[&<>"']/g,c=>({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));const mark=(ids,chosen)=>ids.forEach(id=>q(id).setAttribute('aria-pressed',String(id===chosen)));
const cards=[['el libro rojo','los libros rojos','libro: masculine singular · practice','el → los; libro → libros; rojo → rojos.'],['la carpeta roja','las carpetas rojas','carpeta: feminine singular · practice','la → las; carpeta → carpetas; roja → rojas, matching feminine plural.'],['el libro grande','los libros grandes','libro: masculine singular · practice','Grande becomes grandes for plural; it keeps its shared gender form.'],['la carpeta grande','las carpetas grandes','carpeta: feminine singular · practice','Grande becomes grandes, not grandas.'],['el cuaderno rojo','los cuadernos rojos','cuaderno: masculine singular · independent transfer','Masculine plural: los cuadernos rojos.'],['la mesa grande','las mesas grandes','mesa: feminine singular · independent transfer','Feminine noun; shared-gender grandes for plural.']];let active=0;function select(i){active=i;put('#phrase',cards[i][0]);put('#basis',cards[i][2]);q('#answer').value='';q('#reason').value='';put('#result','Unanswered. Write the complete plural phrase.');mark(cards.map((_,j)=>'#card'+j),'#card'+i);}cards.forEach((_,i)=>on('#card'+i,()=>select(i)));on('#answer',()=>put('#result','Response changed. Check the phrase again.'),'input');on('#check',()=>{const value=q('#answer').value.trim().toLocaleLowerCase('es').replace(/\s+/g,' ').replace(/[.]$/,'');const es=t=>'<span lang="es">'+esc(t)+'</span>';const explanations=[es('el')+' → '+es('los')+'; '+es('libro')+' → '+es('libros')+'; '+es('rojo')+' → '+es('rojos')+'.',es('la')+' → '+es('las')+'; '+es('carpeta')+' → '+es('carpetas')+'; '+es('roja')+' → '+es('rojas')+', matching feminine plural.',es('Grande')+' becomes '+es('grandes')+' for plural; it keeps its shared gender form.',es('Grande')+' becomes '+es('grandes')+', not '+es('grandas')+'.','Masculine plural: '+es('los cuadernos rojos')+'.','Feminine noun; shared-gender '+es('grandes')+' for plural.'];if(!value)put('#result','Unanswered. Write the complete plural phrase.');else q('#result').innerHTML=(value===cards[active][1]?'Phrase matches: '+es(cards[active][1])+'. ':'Revise the whole phrase. ')+explanations[active];});on('#reset',()=>select(0));
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