diff --git a/src/components/clinical-dashboard/global-search-shell.tsx b/src/components/clinical-dashboard/global-search-shell.tsx
index 331812ca..a8524a85 100644
--- a/src/components/clinical-dashboard/global-search-shell.tsx
+++ b/src/components/clinical-dashboard/global-search-shell.tsx
@@ -161,6 +161,7 @@ function GlobalStandaloneSearchShellClient({
   const [mainElement, setMainElement] = useState<HTMLDivElement | null>(null);
   const phoneScrollHide = useScrollHideReporter();
   const reportPhoneScrollHideRef = useRef(phoneScrollHide.reportScroll);
+  const [bottomComposerHidden, setBottomComposerHidden] = useState(false);
   useEffect(() => {
     reportPhoneScrollHideRef.current = phoneScrollHide.reportScroll;
   }, [phoneScrollHide.reportScroll]);
@@ -260,7 +261,7 @@ function GlobalStandaloneSearchShellClient({
   const reservesFloatingComposer = shouldShowSearchComposer && !isStandaloneModeHome;
   // Standalone mode homes portal the composer into the hero (in-flow at every
   // width), so phones need no bottom-dock clearance there.
-  const mobileComposerReserve = !shouldShowSearchComposer
+  const visibleMobileComposerReserve = !shouldShowSearchComposer
     ? "2rem"
     : isStandaloneModeHome
       ? "2rem"
@@ -271,6 +272,15 @@ function GlobalStandaloneSearchShellClient({
           : useCompactBottomSearch
             ? "calc(5.5rem + env(safe-area-inset-bottom))"
             : "calc(9rem + env(safe-area-inset-bottom))";
+  // Release the large bottom reserve only when the phone bottom composer is
+  // actually hidden (MasterSearchHeader's bottomComposerHidden). Header-only
+  // scroll-hide, pinned compare addons, open menus/sheets, and composer focus
+  // keep the full reserve so content does not slide under a still-visible dock.
+  // When the dock does hide, keep only a small safe-area breathing room so
+  // content — not the background — fills the revealed edge-to-edge viewport.
+  const mobileComposerReserve = bottomComposerHidden
+    ? "max(0.75rem, env(safe-area-inset-bottom))"
+    : visibleMobileComposerReserve;
 
   useEffect(() => {
     // Re-derive the mode and query from the URL, but only when the search string
@@ -576,6 +586,7 @@ function GlobalStandaloneSearchShellClient({
             // Phone-only: #main-content owns vertical scroll, so hide-on-scroll
             // collapses the header/composer to hand space back to content.
             hideOnScroll={{ strategy: "collapse", scrollHidden: phoneScrollHide.hidden }}
+            onBottomComposerHiddenChange={setBottomComposerHidden}
             queryInputAutoFocus={searchParams.get("focus") === "1"}
           />
         </div>
diff --git a/src/components/clinical-dashboard/master-search-header.tsx b/src/components/clinical-dashboard/master-search-header.tsx
index 48fc07de..7837d9c3 100644
--- a/src/components/clinical-dashboard/master-search-header.tsx
+++ b/src/components/clinical-dashboard/master-search-header.tsx
@@ -185,6 +185,7 @@ export function MasterSearchHeader({
   mobileLeadingAction = "menu",
   onMobileBack,
   hideOnScroll,
+  onBottomComposerHiddenChange,
 }: {
   demoMode: boolean;
   documents: ClinicalDocument[];
@@ -259,6 +260,8 @@ export function MasterSearchHeader({
     /** Parent-owned hidden state for hosts that report scroll via React `onScroll`. */
     scrollHidden?: boolean;
   };
+  /** Notify hosts when the phone bottom composer is actually hidden (not merely scrolled). */
+  onBottomComposerHiddenChange?: (hidden: boolean) => void;
 }) {
   const visibleAppModeOptions = defaultVisibleAppModeOptions;
   const trimmedQuery = query.trim();
@@ -334,6 +337,10 @@ export function MasterSearchHeader({
     !scopeSheetOpen &&
     !composerChromeFocused;
 
+  useEffect(() => {
+    onBottomComposerHiddenChange?.(bottomComposerHidden);
+  }, [bottomComposerHidden, onBottomComposerHiddenChange]);
+
   useEffect(() => {
     if (!loading || !commandDropdownOpen) return undefined;
     const frame = window.requestAnimationFrame(() => setCommandDropdownOpen(false));
diff --git a/tests/clinical-dashboard-merge-artifacts.test.ts b/tests/clinical-dashboard-merge-artifacts.test.ts
index 7e4a2aca..90cf1df2 100644
--- a/tests/clinical-dashboard-merge-artifacts.test.ts
+++ b/tests/clinical-dashboard-merge-artifacts.test.ts
@@ -87,8 +87,10 @@ describe("ClinicalDashboard merge-artifact guards", () => {
   });
 
   it("reserves phone space for the fixed mode-home composer", () => {
-    expect(globalSearchShellSource).toContain("const mobileComposerReserve = !shouldShowSearchComposer");
+    expect(globalSearchShellSource).toContain("const visibleMobileComposerReserve = !shouldShowSearchComposer");
+    expect(globalSearchShellSource).toContain("const mobileComposerReserve = bottomComposerHidden");
     expect(globalSearchShellSource).not.toContain("const mobileComposerReserve = !reservesFloatingComposer");
+    expect(globalSearchShellSource).not.toContain("const mobileComposerReserve = phoneScrollHide.hidden");
   });
 
   it("does not reintroduce the obsolete output-mode copy helper", () => {