Bulma デザインシステム.

<section class="section"><div class="container"><div class="level"><div class="level-left"><div><p class="is-size-7 has-text-weight-bold has-text-link mb-3">BULMA / LOCAL EDITORIAL DESK</p><h1 class="title is-2">Shape the next issue.</h1><p class="subtitle is-5">An article brief, a preview, and an explicit editorial state.</p></div></div><div class="level-right"><button class="button is-light" id="theme">Dark appearance</button></div></div><div class="columns is-variable is-6"><div class="column is-7"><form id="brief" class="box" novalidate><h2 class="title is-4">Article brief</h2><div class="field"><label class="label" for="headline">Headline</label><div class="control"><input class="input" id="headline" value="A quieter way to work" maxlength="90" aria-describedby="headline-help"></div><p class="help" id="headline-help">Use 5–90 characters. This field updates the preview as you type.</p></div><div class="field"><label class="label" for="section">Section</label><div class="control"><div class="select is-fullwidth"><select id="section"><option>Design notes</option><option>Field research</option><option>Product craft</option></select></div></div></div><div class="field"><label class="label" for="summary">Summary</label><div class="control"><textarea class="textarea" id="summary" rows="3" aria-describedby="summary-help">How small choices in layout and language can make a demanding interface feel manageable.</textarea></div><p class="help" id="summary-help">Use at least 20 characters to give the reviewer enough context.</p></div><div class="field"><label class="checkbox"><input id="checked" type="checkbox" aria-describedby="checked-help" aria-describedby="checked-help"> I have checked the headline and summary</label><p class="help" id="checked-help"></p></div><div class="field is-grouped is-grouped-multiline"><div class="control"><button type="submit" class="button is-link">Mark ready for review</button></div><div class="control"><button id="reset" type="button" class="button is-light">Restore draft</button></div></div><p id="result" class="help" role="status">Draft changes stay in this page only.</p></form></div><div class="column is-5"><article class="card"><header class="card-header"><p class="card-header-title">Issue 08 / Article preview</p><span id="state" class="tag is-warning is-light mr-4 my-4">Draft</span></header><div class="card-content"><p class="is-size-7 has-text-link has-text-weight-bold mb-3" id="preview-section">Design notes</p><h2 class="title is-3" id="preview-title">A quieter way to work</h2><div class="content" id="preview-summary">How small choices in layout and language can make a demanding interface feel manageable.</div><hr><p class="is-size-7">Copy desk · Reading time assigned after editing</p></div></article><article class="message is-info mt-5"><div class="message-header"><p>Review is a separate step</p></div><div class="message-body">Ready for review is a local label. It does not publish this article, send a notification, or save a draft on a server.</div></article></div></div><p class="is-size-7">Official Bulma 1.0.4 CSS. Form validation and preview updates are original JavaScript.</p></div></section>

const $=id=>document.getElementById(id);
const fields=['headline','summary'];
function draft(){ $('state').textContent='Draft';$('state').className='tag is-warning is-light mr-4 my-4';$('result').textContent='Draft changes stay in this page only.';}
function preview(){ $('preview-title').textContent=$('headline').value.trim()||'Untitled article';$('preview-summary').textContent=$('summary').value.trim()||'No summary yet.';$('preview-section').textContent=$('section').value;draft();}
for(const id of ['headline','summary','section','checked'])$(id).addEventListener('input',preview);
$('brief').addEventListener('submit',event=>{event.preventDefault();let first=null;for(const id of fields){const invalid=$(id).value.trim().length<(id==='headline'?5:20);$(id).classList.toggle('is-danger',invalid);$(id).setAttribute('aria-invalid',String(invalid));$(id+'-help').classList.toggle('is-danger',invalid);if(invalid&&!first)first=$(id);}$('checked-help').textContent=$('checked').checked?'':'Confirm the copy check before review.';$('checked-help').className='help is-danger';if(!$('checked').checked&&!first)first=$('checked');if(first){$('result').textContent='Check the highlighted brief fields.';first.focus();return;}$('state').textContent='Ready for review';$('state').className='tag is-success is-light mr-4 my-4';$('result').textContent='Marked ready in this local preview. Nothing was published.';});
$('reset').addEventListener('click',()=>{$('brief').reset();for(const id of fields){$(id).classList.remove('is-danger');$(id).removeAttribute('aria-invalid');$(id+'-help').classList.remove('is-danger');}$('checked-help').textContent='';preview();});
$('theme').addEventListener('click',()=>{const dark=document.documentElement.dataset.theme!=='dark';document.documentElement.dataset.theme=dark?'dark':'light';$('theme').textContent=dark?'Light appearance':'Dark appearance';});