diff --git a/internal/web/static/app.css b/internal/web/static/app.css
index ea4bf6e..12bc281 100644
--- a/internal/web/static/app.css
+++ b/internal/web/static/app.css
@@ -98,7 +98,6 @@ input:focus { outline: 0; border-color: var(--accent); }
   display: flex; justify-content: space-between; padding: 2px 0;
   font-family: ui-monospace, monospace; font-variant-numeric: tabular-nums;
 }
-.switches { font-size: 12px; color: var(--ink-dim); margin-top: 8px; }
 
 /* Review summary band */
 .summary { font-size: 14px; }
diff --git a/internal/web/static/app.js b/internal/web/static/app.js
index fe6cae3..98adf5a 100644
--- a/internal/web/static/app.js
+++ b/internal/web/static/app.js
@@ -35,7 +35,7 @@ function setStateAttr(state) {
 }
 
 function evidenceBlock(ev) {
-  if (!ev) return '';
+  if (!ev) return `<div class="band evidence" id="evidence" hidden></div>`;
   const health = ev.available
     ? `<span class="health-ok">tracking</span>`
     : `<span class="health-bad">evidence unavailable: ${ev.reason || 'unknown'}</span>`;
@@ -43,13 +43,20 @@ function evidenceBlock(ev) {
     ? `${ev.current.class || '?'} · ${ev.current.title || ''}` : '—';
   const rows = (ev.buckets || []).map(b =>
     `<li><span>${(b.class || '?')} · ${b.title || ''}</span><span>${fmt(b.seconds)}</span></li>`).join('');
-  return `<div class="band evidence">
+  return `<div class="band evidence" id="evidence">
     <div class="now">now ${now} &nbsp; ${health}</div>
     <ul class="buckets">${rows}</ul>
-    <div class="switches">context switches: ${ev.switch_count || 0}</div>
   </div>`;
 }
 
+// updateActiveEvidence repaints the live evidence band (current window, per-window
+// buckets, switch count) on every active tick. The band carries no event listeners,
+// so swapping outerHTML wholesale is safe and keeps a single render source.
+function updateActiveEvidence(state) {
+  const el = document.getElementById('evidence');
+  if (el) el.outerHTML = evidenceBlock(state.evidence);
+}
+
 // reviewSummary renders a presentational recap from already-available state:
 // the commitment plus the per-window evidence buckets. No new backend data.
 function reviewSummary(ev) {
@@ -213,6 +220,7 @@ function render(state) {
   }
   if (rs === 'active' && renderedState === 'active') {
     updateActiveDrift(state);
+    updateActiveEvidence(state);
     return;
   }
   if (countdownTimer) { clearInterval(countdownTimer); countdownTimer = null; }