Same quantity. Different counter.

Select the code and use your copy shortcut. Changes in this preview are temporary.

<!doctype html>
<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Same quantity. Different counter.</title><style>:root{color-scheme:light;--ink:#192e38;--accent:#255e61;--wash:#e6f1ed;--paper:#faf9f4}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.6 system-ui,sans-serif}main{max-width:1040px;margin:auto;padding:22px 24px 42px}header{border-top:5px solid var(--accent);padding-top:12px;margin-bottom:17px}.eyebrow{font-size:16px;font-weight:750;color:var(--accent);margin:0 0 4px}h1{font-size:clamp(26px,4vw,38px);line-height:1.2;letter-spacing:-.025em;margin:0 0 10px}h2{font-size:23px;line-height:1.3;margin:0 0 12px}h3{font-size:19px;margin:0 0 8px}p{margin:0 0 13px}.lede{max-width:850px}.stage{background:white;border:1px solid #b4c4c8;border-radius:10px;padding:20px;margin:15px 0}.sample{background:var(--wash);border-left:5px solid var(--accent);padding:16px;margin:12px 0}.result{border-top:3px solid var(--accent);padding:16px 0 4px;margin-top:14px;font-weight:700;font-size:19px;white-space:pre-wrap;overflow-wrap:anywhere}.detail{white-space:pre-wrap;overflow-wrap:anywhere}button,input,textarea,select{font:inherit}button{min-height:46px;background:var(--accent);color:white;border:1px solid var(--accent);border-radius:6px;padding:9px 14px;cursor:pointer;font-weight:650}button:hover{filter:brightness(.9)}button[aria-pressed=true]{box-shadow:inset 0 0 0 3px #d5f525}button:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #245bad;outline-offset:3px}button:disabled{opacity:.6;cursor:default}.controls{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}label{display:block;font-weight:650;margin:11px 0 6px}input,textarea{display:block;width:100%;min-width:0;max-width:100%;background:white;color:var(--ink);border:1px solid #8199a1;border-radius:5px;padding:10px 12px}textarea{min-height:110px;resize:vertical;font:16px/1.5 ui-monospace,Consolas,monospace}.grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.grid>*{min-width:0}ul,ol{padding-left:23px}li{margin:6px 0}.small,summary,footer{font-size:16px;color:#415964}code,pre{font:16px/1.5 ui-monospace,Consolas,monospace}pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#edf1f1;padding:16px;border-radius:6px}code{overflow-wrap:anywhere}.chip{display:inline-block;border:1px solid #95aeb4;border-radius:4px;padding:2px 8px;font-size:16px;margin:3px}svg{display:block;width:100%;height:auto}svg text{font-family:system-ui,sans-serif}details{margin:20px 0;border-top:1px solid #a7bdc2;padding-top:13px}summary{cursor:pointer;font-weight:750}mark{background:#d5f525;color:#202600}footer{border-top:1px solid #a7bdc2;padding-top:15px;margin-top:22px}table{width:100%;border-collapse:collapse;table-layout:fixed}th,td{padding:10px 8px;text-align:left;vertical-align:top;border-bottom:1px solid #c2cfd2;overflow-wrap:anywhere}th{background:var(--wash)}.number{font-size:32px;font-weight:800}.note{border-left:3px solid #a78e51;padding-left:12px}@media(max-width:650px){main{padding:15px 17px 30px}.grid{grid-template-columns:1fr;gap:14px}.stage{padding:15px}header{margin-bottom:12px}.controls button{flex:1 1 auto}h1{font-size:27px}th,td{padding:8px 5px}}@media(max-width:650px){.stage .grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.stage .grid>*{min-width:0}}</style></head><body><main style="--accent:#9a3b39;--wash:#fdeceb"><header><p class="eyebrow"><span lang="ja">日本語</span> / COUNTER COMPARISON</p><h1>Same quantity. Different counter.</h1><p class="lede">Four original cards. Kana-only written checks; no audio or pronunciation grading.</p></header><section class="stage"><div class="controls"><button type="button" id="j1">J1</button><button type="button" id="j2">J2</button><button type="button" id="j3">J3</button><button type="button" id="j4">J4</button></div><p id="card" class="sample"></p><div class="grid"><div><label for="quantity">Quantity</label><input id="quantity" type="number" value="1"><label for="counterInput">Counter</label><input lang="ja" id="counterInput" type="text" value="本"></div><div><label for="written">Written count</label><input lang="ja" id="written" type="text" value="一本"><label for="reading">Kana reading</label><input lang="ja" id="reading" type="text" value="いっぽん"></div></div><div class="controls"><button type="button" id="check">Check written response</button><button type="button" id="reset">Reset unanswered</button></div><p id="result" class="result" role="status" aria-live="polite"></p><p id="agreement"></p></section><details><summary>Reviewed four-card key</summary><p><span lang="ja">J1 一本 / いっぽん · J2 二本 / にほん · J3 三本 / さんぼん · J4 三枚 / さんまい</span>. Pencils use <span lang="ja">本</span>; separate sheets use <span lang="ja">枚</span> in this bank.</p></details><footer>Original fictional practice example. Current-page interaction only; no saved records or external requests.</footer></main>
<script>
(()=>{
'use strict';
const $=s=>document.querySelector(s);const out=(s,v)=>{$(s).textContent=String(v);};const on=(s,f)=>$(s).addEventListener('click',f);
const japaneseRuns=/([\u3040-\u30ff\u3400-\u9fff]+)/g;function languageResult(selector){const el=$(selector),text=el.textContent;el.replaceChildren();text.split(japaneseRuns).filter(Boolean).forEach(part=>{const span=document.createElement('span');if(/^[\u3040-\u30ff\u3400-\u9fff]+$/.test(part))span.setAttribute('lang','ja');span.textContent=part;el.append(span);});}const cards=[['One individual pencil',1,'本','一本','いっぽん'],['Two individual pencils',2,'本','二本','にほん'],['Three individual pencils',3,'本','三本','さんぼん'],['Three separate paper sheets',3,'枚','三枚','さんまい']];let current=0;const fields=['quantity','counterInput','written','reading'];function pending(){out('#result','Response changed; check current fields.');out('#agreement','');}function display(){out('#card','J'+(current+1)+' · '+cards[current][0]);}function clear(){fields.forEach(id=>$('#'+id).value='');pending();}function check(){const values=fields.map(id=>$('#'+id).value.trim());if(values.some(v=>!v)){out('#result','Incomplete: enter quantity, counter, written count, and kana reading.');out('#agreement','');return;}const key=cards[current];out('#result',['Quantity: '+(Number(values[0])===key[1]?'matches':'revise to '+key[1]),'Counter: '+(values[1]===key[2]?'matches':'revise to '+key[2]),'Written count: '+(values[2]===key[3]?'matches':'revise to '+key[3]),'Target reading: '+(values[3]===key[4]?'matches':'revise to '+key[4])].join('\n'));const submitted=cards.find(c=>c[3]===values[2]);out('#agreement',submitted?(submitted[4]===values[3]?'Reading agrees with submitted '+values[2]+'.':'Reading does not agree with submitted '+values[2]+'.'):'Submitted written count is outside this four-card key.');languageResult('#result');languageResult('#agreement');}cards.forEach((c,i)=>on('#j'+(i+1),()=>{current=i;display();clear();}));fields.forEach(id=>$('#'+id).addEventListener('input',pending));on('#check',check);on('#reset',()=>{current=0;display();clear();});display();check();
})();
</script>
</body></html>