diff --git a/app/globals.css b/app/globals.css
index 13f7a9d6..7f42c674 100644
--- a/app/globals.css
+++ b/app/globals.css
@@ -106,6 +106,15 @@
   --mobile-generate-bar-pad: calc(
     var(--mobile-generate-bar-h) + var(--mobile-nav-clearance) + 0.5rem
   );
+  /*
+   * Toast stack clears MobileGenerateBar + tab nav (AIT-597 / AIT-447 residual).
+   * MobileGenerateBar parks at --mobile-nav-clearance (pill row ~3.25rem).
+   * Without bar-h, toast lands in the same band as the Generate pills on browse
+   * surfaces (library/explore/pricing/…). Desktop keeps lg:bottom-6 in Toast.tsx.
+   */
+  --toast-clearance: calc(
+    var(--mobile-nav-clearance) + var(--mobile-generate-bar-h) + 0.5rem
+  );
 
   /* shadcn-compatible aliases */
   --background: var(--bg);
diff --git a/components/Toast.tsx b/components/Toast.tsx
index c76416b6..3ded7f1f 100644
--- a/components/Toast.tsx
+++ b/components/Toast.tsx
@@ -28,10 +28,13 @@ export function ToastProvider({ children }: { children: React.ReactNode }) {
   return (
     <ToastCtx.Provider value={value}>
       {children}
-      {/* Clear tab nav + home indicator on mobile; desktop keeps a simple inset. */}
+      {/*
+        Mobile: --toast-clearance stacks MobileGenerateBar + tab nav + gap
+        (AIT-597 / AIT-447 residual). Desktop keeps a simple inset (lg:bottom-6).
+      */}
       <div
         data-toast-stack="safe"
-        className="pointer-events-none fixed bottom-[calc(var(--mobile-nav-clearance)+0.5rem)] right-4 z-[120] flex max-w-[min(22rem,calc(100vw-2rem))] flex-col gap-2 lg:bottom-6"
+        className="pointer-events-none fixed bottom-[var(--toast-clearance)] right-4 z-[120] flex max-w-[min(22rem,calc(100vw-2rem))] flex-col gap-2 lg:bottom-6"
       >
         {items.map((t) => (
           <div
diff --git a/scripts/generate-360-cta-smoke.mjs b/scripts/generate-360-cta-smoke.mjs
index a1f03e47..7d74d6a7 100644
--- a/scripts/generate-360-cta-smoke.mjs
+++ b/scripts/generate-360-cta-smoke.mjs
@@ -556,7 +556,7 @@ assert.match(
   "BatchStudio sticky must expose clearance branch marker"
 );
 
-// 8. AIT-185 — Toast stack clears tab + home indicator (never hard bottom-20)
+// 8. AIT-597 / AIT-447 — Toast clears MobileGenerateBar + tab + home indicator
 const toastSrc = read("components/Toast.tsx");
 assert.match(
   toastSrc,
@@ -564,15 +564,46 @@ assert.match(
   "Toast stack must expose data-toast-stack=safe"
 );
 assert.match(
+  toastSrc,
+  /bottom-\[var\(--toast-clearance\)\]/,
+  "Toast stack must use --toast-clearance (bar + nav, AIT-597)"
+);
+assert.match(
+  toastSrc,
+  /lg:bottom-6/,
+  "Toast desktop keeps bottom-6"
+);
+assert.doesNotMatch(
   toastSrc,
   /bottom-\[calc\(var\(--mobile-nav-clearance\)\+0\.5rem\)\]/,
-  "Toast stack must clear tab nav + home indicator via --mobile-nav-clearance"
+  "Toast must not park on nav-only clearance under MobileGenerateBar"
 );
 assert.doesNotMatch(
   toastSrc,
   /bottom-20/,
   "Toast stack must not hardcode bottom-20 (misses notched safe-area)"
 );
+assert.match(
+  globalsCss,
+  /--toast-clearance:\s*calc\(\s*var\(--mobile-nav-clearance\)\s*\+\s*var\(--mobile-generate-bar-h\)\s*\+\s*0\.5rem\s*\)/,
+  "globals --toast-clearance stacks bar-h + nav clearance + gap"
+);
+assert.match(
+  globalsCss,
+  /--mobile-generate-bar-h:\s*3\.25rem/,
+  "globals defines --mobile-generate-bar-h for toast stack"
+);
+// Bar-route: MobileGenerateBar and toast must not share the same bottom band
+assert.match(
+  mobileBar,
+  /bottom-\[var\(--mobile-nav-clearance\)\]/,
+  "MobileGenerateBar parks on --mobile-nav-clearance"
+);
+assert.match(
+  mobileBar,
+  /data-floating-generate=["']mobile-bar["']/,
+  "MobileGenerateBar keeps data-floating-generate marker on bar routes"
+);
 // AIT-374: Toast residual competitor lime → neon-pink / void board tokens
 assert.doesNotMatch(
   toastSrc,
diff --git a/scripts/mobile-proof-regression.mjs b/scripts/mobile-proof-regression.mjs
index 51c20065..230cb6ab 100644
--- a/scripts/mobile-proof-regression.mjs
+++ b/scripts/mobile-proof-regression.mjs
@@ -126,16 +126,38 @@ assert.match(
 );
 {
   const toast = source("components/Toast.tsx");
+  const globals = source("app/globals.css");
+  // AIT-597 / AIT-447: toast must clear MobileGenerateBar + tab nav, not nav alone
   assert.match(
+    toast,
+    /bottom-\[var\(--toast-clearance\)\]/,
+    "Toast stack uses --toast-clearance (bar + nav, AIT-597)"
+  );
+  assert.match(
+    toast,
+    /lg:bottom-6/,
+    "Toast desktop keeps bottom-6"
+  );
+  assert.doesNotMatch(
     toast,
     /bottom-\[calc\(var\(--mobile-nav-clearance\)\+0\.5rem\)\]/,
-    "Toast stack clears mobile nav + safe-area (AIT-185)"
+    "Toast must not park on nav-only clearance under MobileGenerateBar"
   );
   assert.doesNotMatch(
     toast,
     /bottom-20/,
     "Toast must not hardcode bottom-20 under notched home indicator"
   );
+  assert.match(
+    globals,
+    /--toast-clearance:\s*calc\(\s*var\(--mobile-nav-clearance\)\s*\+\s*var\(--mobile-generate-bar-h\)\s*\+\s*0\.5rem\s*\)/,
+    "globals --toast-clearance stacks bar-h + nav clearance + gap"
+  );
+  assert.match(
+    globals,
+    /--mobile-generate-bar-h:\s*3\.25rem/,
+    "globals defines MobileGenerateBar height token for toast stack"
+  );
   // AIT-374: residual competitor lime → neon-pink / void board
   assert.doesNotMatch(
     toast,
@@ -152,6 +174,18 @@ assert.match(
     /rgba\(255,\s*78,\s*205/,
     "Toast glow uses neon-pink board rgba"
   );
+  // Bar-route surface still mounts MobileGenerateBar above the same nav band
+  const bar = source("components/MobileGenerateBar.tsx");
+  assert.match(
+    bar,
+    /data-floating-generate=["']mobile-bar["']/,
+    "MobileGenerateBar marker remains for bar-route collision smoke"
+  );
+  assert.match(
+    bar,
+    /bottom-\[var\(--mobile-nav-clearance\)\]/,
+    "MobileGenerateBar parks on nav clearance; toast must clear above it"
+  );
 }
 {
   // AIT-394: MobileGenerateBar floating Generate primary CTA off residual lime