Java scoped values

<div class="v"><header><b>SCOPED VALUE</b><span id="state"></span></header><main><div class="scope"><div class="outer" id="outer">REQUEST ID: A7<div class="inner" id="inner">NESTED: B2</div></div></div><div class="readout" id="readout"></div></main><footer>nested binding restores the outer value</footer></div>

.v{width:min(92vw,660px);height:min(86vh,310px);box-sizing:border-box;padding:clamp(9px,2.5vmin,18px);border:1px solid var(--line);border-radius:14px;background:var(--surface);display:flex;flex-direction:column;gap:7px;color:var(--fg);font:500 clamp(15px,3.2vmin,17px)/1.25 var(--font-sans, sans-serif)}.v header,.v footer{display:flex;justify-content:space-between;align-items:center;gap:8px;white-space:nowrap}.v header b{color:var(--accent);font-size:.9em}.v header span,.v footer{color:var(--muted);font-size:.82em}.v main{flex:1;min-height:0;position:relative;overflow:hidden}.v .mono{font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.v .active{background:var(--accent)!important;color:var(--bg)!important;border-color:var(--accent)!important}.v .muted{opacity:.28} .scope{height:71%;display:grid;place-items:center}.outer{width:84%;height:76%;box-sizing:border-box;border:2px solid var(--accent);border-radius:9px;padding:7px;color:var(--accent);font:600 clamp(12px,2.8vmin,16px) var(--font-sans, sans-serif)}.inner{height:52%;margin:7px 8px 0;padding:5px;border:1px solid var(--accent-2);border-radius:6px;color:var(--accent-2);transition:opacity .25s}.readout{text-align:center;color:var(--fg);font:600 clamp(12px,2.8vmin,16px) var(--font-sans, sans-serif)}

let n=0;const values=["A7 (outer)","B2 (nested)","A7 (restored)","unbound"];function draw(){document.getElementById("inner").style.opacity=n===1?"1":".28";document.getElementById("outer").style.opacity=n===3?".28":"1";document.getElementById("readout").textContent="read → "+values[n];document.getElementById("state").textContent="scope "+(n+1)+" / 4";n=(n+1)%4}draw();setInterval(draw,1050)