diff --git a/docs/reference/cloud-workbench.md b/docs/reference/cloud-workbench.md
index 21bdf964..16fa5dac 100644
--- a/docs/reference/cloud-workbench.md
+++ b/docs/reference/cloud-workbench.md
@@ -40,6 +40,15 @@ The default workbench follows the #99 VS Code-style structure:
 Unavailable or future controls must be disabled with blocker context. The
 frontend must not imply generic direct hardware control.
 
+The center-bottom command composer is the primary user action surface. Topbar
+runtime summaries, live-build indicators, dialogs, and status chips may report
+context, but they must never cover or intercept clicks intended for the command
+composer, Code Agent input, send controls, or quick-prompt buttons. If a fixed
+or visually persistent status surface can overlap after `scrollIntoView`, mobile
+reflow, or trace updates, the composer layer must win the stacking order and
+non-interactive summary text must not become a pointer target. Layout/browser
+smoke should treat this as a real hit-target failure, not as a test flake.
+
 The left resource explorer is a controlled resizable column on desktop-class
 viewports. Its width defaults to `292px`, clamps inside a bounded range
 (`220px` to `420px` before viewport-specific clamping), and is changed through
diff --git a/web/hwlab-cloud-web/scripts/check.mjs b/web/hwlab-cloud-web/scripts/check.mjs
index 4e8bb497..caaf91f3 100644
--- a/web/hwlab-cloud-web/scripts/check.mjs
+++ b/web/hwlab-cloud-web/scripts/check.mjs
@@ -1117,6 +1117,8 @@ assert.match(html, /id="live-build-latest"/);
 assert.match(html, /id="live-build-list"/);
 assert.match(html, /id="live-build-toggle"[^>]*aria-haspopup="dialog"[^>]*aria-expanded="false"/);
 assert.match(styles, /\.live-build-summary\s*{/);
+assert.match(styles, /\.topbar\s*{[^}]*position:\s*relative;[^}]*z-index:\s*1;/s);
+assert.match(styles, /\.command-bar\s*{[^}]*position:\s*relative;[^}]*z-index:\s*2;/s);
 assert.match(app, /initLiveBuildOverlay/);
 assert.match(app, /openWorkbenchDialog/);
 assert.match(app, /aria-expanded/);
@@ -1131,6 +1133,7 @@ assert.match(app, /liveBuildDesiredStateText/);
 assert.match(app, /外部镜像或非 HWLAB 构建产物/);
 assert.doesNotMatch(app, /artifact report|artifact-report/);
 assert.match(app, /live health/);
+assert.match(styles, /\.live-build-summary-label\s*{[^}]*pointer-events:\s*none;/s);
 assert.match(styles, /\.live-build-summary-label\s*{[^}]*min-width:\s*0;[^}]*max-width:\s*100%;[^}]*overflow:\s*hidden;[^}]*text-overflow:\s*ellipsis;[^}]*white-space:\s*nowrap;/s);
 assert.match(styles, /\.live-build-list\s*{[^}]*min-width:\s*0;[^}]*max-height:\s*min\(352px,\s*calc\(58dvh - 54px\)\);[^}]*overflow:\s*auto;/s);
 assert.match(styles, /\.live-build-row-head\s*{[^}]*grid-template-columns:\s*minmax\(0,\s*0\.8fr\)\s*minmax\(0,\s*1\.2fr\);/s);
diff --git a/web/hwlab-cloud-web/styles.css b/web/hwlab-cloud-web/styles.css
index b182e885..bb491cec 100644
--- a/web/hwlab-cloud-web/styles.css
+++ b/web/hwlab-cloud-web/styles.css
@@ -473,6 +473,8 @@ h3 {
 }
 
 .topbar {
+  position: relative;
+  z-index: 1;
   min-height: 82px;
   display: grid;
   grid-template-columns: minmax(0, 1fr) minmax(320px, 460px) auto;
@@ -555,6 +557,7 @@ h3 {
 }
 
 .live-build-summary-label {
+  pointer-events: none;
   min-width: 0;
   max-width: 100%;
   overflow: hidden;
@@ -1520,6 +1523,11 @@ h3 {
   overflow-wrap: anywhere;
 }
 
+.command-bar {
+  position: relative;
+  z-index: 2;
+}
+
 .info-detail,
 .command-bar {
   display: grid;