Paper folds

<!doctype html><html lang="ja"><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><style>body{margin:0;min-height:330px}.sample{width:100%;height:100%;min-height:330px;padding:12px!important;display:flex!important;flex-direction:column;justify-content:center;align-items:center;gap:8px!important;background:#f0efeb;color:#232323;font-family:Arial,Meiryo,sans-serif;overflow:hidden;box-sizing:border-box}.sample *{box-sizing:border-box}.lab-scene{width:100%;max-width:430px;height:140px;position:relative;overflow:hidden;border-bottom:1px solid #ccc}.lab-scene:has(canvas){max-width:320px;height:auto;aspect-ratio:16/9;flex-shrink:0}.lab-canvas{display:block;width:100%;height:100%!important;outline-offset:-3px}.lab-canvas:focus-visible{outline:2px solid #222}.lab-controls{width:100%;max-width:390px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 14px}.lab-controls label{display:grid;grid-template-columns:1fr auto;gap:2px;font-size:11px;min-width:0}.lab-controls input{grid-column:1/-1;width:100%;min-width:0;margin:0;accent-color:#333;height:30px}.lab-controls output{font-variant-numeric:tabular-nums}.lab-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap;justify-content:center}.sample .lab-actions button{color:inherit;font:11px Arial,Meiryo,sans-serif;border:1px solid #aaa;border-radius:99px;background:transparent;min-height:44px;padding:8px 12px;cursor:pointer}.lab-status{font-size:10px;line-height:1.4;min-height:14px;margin:0;text-align:center}.lab-note{font-size:9px;line-height:1.3;color:#666;margin:0;text-align:center}.lab-actions button:focus-visible{outline:2px solid #222;outline-offset:2px}@media(prefers-reduced-motion:reduce){.sample *{animation-play-state:paused!important;transition:none!important}}.paper-art{position:absolute;inset:0;background:#e8e3d7;padding:12px 20px;overflow:hidden}.paper-art>span{position:relative;z-index:2;font:9px monospace;letter-spacing:.1em}.paper-art>b{position:relative;z-index:2;font:bold 37px/.9 Arial;letter-spacing:-2px;display:block;margin-top:10px}.paper-art>i{position:absolute;right:18%;top:22px;width:92px;height:92px;border-radius:50%;background:#898b83}.changed .paper-art{background:#d0d0cb}.paper-art:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent calc(var(--fold,50)*1% - 5%),#fff calc(var(--fold,50)*1% - .5%),#555 calc(var(--fold,50)*1%),transparent calc(var(--fold,50)*1% + 7%));opacity:calc(var(--opacity,35)/100);pointer-events:none}</style><div class="sample"><div class="lab-scene"><div class="paper-art"><span>EXPRESSION / 01</span><b>good<br>things.</b><i></i></div></div><div class="lab-controls"><label>折り目の位置 %<output>50</output><input aria-label="折り目の位置 %" type="range" min="20" max="80" step="1" value="50" data-key="fold"></label><label>折り目の濃さ %<output>35</output><input aria-label="折り目の濃さ %" type="range" min="0" max="80" step="1" value="35" data-key="opacity"></label></div><div class="lab-actions"><button data-play>停止</button><button data-reset>紙色を変える</button></div><p class="lab-status" role="status"></p></div><script>const lab=(function runDomLab(root,cfg,setup){
 const abort=new AbortController(),values=Object.fromEntries(cfg.controls.map(c=>[c.key,c.value])),mq=matchMedia('(prefers-reduced-motion:reduce)');let auto=!mq.matches;
 const on=(el,event,fn)=>el.addEventListener(event,fn,{signal:abort.signal});
 const api=setup({root,values,kind:cfg.kind,on,reduced:mq.matches})||{};
 for(const input of root.querySelectorAll('[data-key]'))on(input,'input',()=>{values[input.dataset.key]=Number(input.value);input.closest('label').querySelector('output').textContent=input.value;api.update?.()});
 const play=root.querySelector('[data-play]');on(play,'click',()=>{auto=!auto;api.setAuto?.(auto);for(const a of root.querySelector('.lab-scene').getAnimations({subtree:true}))auto?a.play():a.pause();play.textContent=auto?'停止':'再生';play.setAttribute('aria-pressed',String(!auto))});
 const reset=root.querySelector('[data-reset]');on(reset,'click',()=>api.action?.());
 on(document,'visibilitychange',()=>api.setAuto?.(auto&&!document.hidden));
 api.update?.();if(cfg.static)play.hidden=true;
 return {setAuto(on){auto=on&&!mq.matches;api.setAuto?.(auto);for(const a of root.querySelector('.lab-scene').getAnimations({subtree:true}))auto?a.play():a.pause();play.textContent=auto?'停止':'再生'},destroy(){abort.abort();api.destroy?.()}};
})(document,{"kind":"texture-paper","controls":[{"key":"fold","label":"折り目の位置 %","min":20,"max":80,"value":50,"step":1},{"key":"opacity","label":"折り目の濃さ %","min":0,"max":80,"value":35,"step":1}],"static":true,"action":"紙色を変える"},function editorial({root,values:v,kind}){const stage=root.querySelector('.lab-scene'),status=root.querySelector('.lab-status');let changed=false;return {update(){for(const[k,x]of Object.entries(v))stage.style.setProperty('--'+k,String(x));if(kind==='type-variable'){root.querySelector('.editorial-word').style.fontVariationSettings=`"wght" ${v.weight}`;}if(kind==='texture-grain')root.querySelector('feTurbulence').setAttribute('baseFrequency',String(v.frequency));if(kind==='layout-intrinsic')root.querySelector('.layout-board').style.width=v.width+'%';status.textContent=kind==='type-variable'?'Inter variable / wght '+v.weight:'';},action(){changed=!changed;stage.classList.toggle('changed',changed);if(kind==='type-variable'){root.querySelector('.editorial-word').style.fontVariationSettings=`"wght" ${changed?400:v.weight}`;status.textContent=changed?'比較 / wght 400':'選んだ太さ / wght '+v.weight;}else status.textContent=changed?'変化後':'元の状態';}}});addEventListener('pagehide',()=>lab.destroy(),{once:true});</script></html>