diff --git a/desktop/src/features/agents/ui/AgentCreationPreview.tsx b/desktop/src/features/agents/ui/AgentCreationPreview.tsx
index 0752b3a267..f46321093e 100644
--- a/desktop/src/features/agents/ui/AgentCreationPreview.tsx
+++ b/desktop/src/features/agents/ui/AgentCreationPreview.tsx
@@ -455,7 +455,7 @@ export function AgentCreationPreview({
       className={cn(
         "w-[400px] p-3",
         isOnboarding &&
-          "buzz-onboarding-neutral-theme bg-white text-foreground",
+          "buzz-onboarding-neutral-theme bg-white text-foreground [--buzz-onboarding-cta-label:#fff]",
       )}
       data-system-color-scheme={isOnboarding ? "light" : undefined}
       side="bottom"
diff --git a/desktop/src/features/onboarding/onboardingPreview.ts b/desktop/src/features/onboarding/onboardingPreview.ts
index a940dad29f..4d1770b66e 100644
--- a/desktop/src/features/onboarding/onboardingPreview.ts
+++ b/desktop/src/features/onboarding/onboardingPreview.ts
@@ -15,6 +15,7 @@ export type OnboardingPreviewPage =
   | "sign-in-key"
   | "forgot-password"
   | "backup-options"
+  | "identity-key-help"
   | "backup-password"
   | "setup"
   | "config"
diff --git a/desktop/src/features/onboarding/ui/BackupStep.tsx b/desktop/src/features/onboarding/ui/BackupStep.tsx
index cecef42fe7..cd267540c6 100644
--- a/desktop/src/features/onboarding/ui/BackupStep.tsx
+++ b/desktop/src/features/onboarding/ui/BackupStep.tsx
@@ -66,6 +66,7 @@ type BackupStepProps = {
   direction: OnboardingTransitionDirection;
   identityStorage?: IdentityStorage;
   onNext: () => void;
+  onOpenIdentityKeyHelp?: () => void;
   onOpenPasswordBackup: () => void;
   onShowOptions: () => void;
   optionsExpanded: boolean;
@@ -85,6 +86,7 @@ export function BackupStep({
   direction,
   identityStorage,
   onNext,
+  onOpenIdentityKeyHelp,
   onOpenPasswordBackup,
   onShowOptions,
   optionsExpanded,
@@ -225,13 +227,17 @@ export function BackupStep({
             {previewMode ? "Create a private identity key" : "Backup options"}
           </h1>
           {previewMode ? (
-            <div className="mt-5">
+            <div className={cardLayout ? "mt-2" : "mt-5"}>
               <p className="text-sm leading-6 text-foreground/75">
                 This key will be how you log into Buzz. You can use it across
                 Buzz communities and other platforms.
               </p>
               <div className="mt-2">
-                <IdentityKeyHelpDialog inline previewMode />
+                <IdentityKeyHelpDialog
+                  inline
+                  onPreviewOpen={onOpenIdentityKeyHelp}
+                  previewMode
+                />
               </div>
             </div>
           ) : (
diff --git a/desktop/src/features/onboarding/ui/IdentityKeyHelpDialog.tsx b/desktop/src/features/onboarding/ui/IdentityKeyHelpDialog.tsx
index 35ea79b355..72769f79a0 100644
--- a/desktop/src/features/onboarding/ui/IdentityKeyHelpDialog.tsx
+++ b/desktop/src/features/onboarding/ui/IdentityKeyHelpDialog.tsx
@@ -36,9 +36,11 @@ function rememberIdentityKeyHelpSeen() {
 
 export function IdentityKeyHelpDialog({
   inline = false,
+  onPreviewOpen,
   previewMode = false,
 }: {
   inline?: boolean;
+  onPreviewOpen?: () => void;
   previewMode?: boolean;
 }) {
   const [isVisible, setIsVisible] = React.useState(
@@ -56,29 +58,38 @@ export function IdentityKeyHelpDialog({
     return () => window.clearTimeout(timeout);
   }, [isVisible, previewMode]);
 
-  const trigger = (
-    <DialogTrigger asChild>
-      <Button
-        className={cn(
-          previewMode
-            ? "text-foreground underline decoration-foreground/45 underline-offset-4 hover:decoration-foreground"
-            : "text-foreground/70 hover:text-foreground",
-          "transition-opacity duration-300 motion-reduce:transition-none",
-          inline && "h-auto justify-start p-0 text-left",
-          isVisible ? "opacity-100" : "pointer-events-none opacity-0",
-        )}
-        data-testid="identity-key-help-trigger"
-        tabIndex={isVisible ? 0 : -1}
-        type="button"
-        variant="link"
-      >
-        {previewMode
-          ? "Learn how identity keys work"
-          : "What’s an identity key?"}
-      </Button>
-    </DialogTrigger>
+  const triggerButton = (
+    <Button
+      className={cn(
+        previewMode
+          ? "text-foreground underline decoration-foreground/45 underline-offset-4 hover:decoration-foreground"
+          : "text-foreground/70 hover:text-foreground",
+        "transition-opacity duration-300 motion-reduce:transition-none",
+        inline && "h-auto justify-start p-0 text-left",
+        isVisible ? "opacity-100" : "pointer-events-none opacity-0",
+      )}
+      data-testid="identity-key-help-trigger"
+      onClick={previewMode ? onPreviewOpen : undefined}
+      tabIndex={isVisible ? 0 : -1}
+      type="button"
+      variant="link"
+    >
+      {previewMode ? "Learn how identity keys work" : "What’s an identity key?"}
+    </Button>
   );
 
+  if (previewMode && onPreviewOpen) {
+    return inline ? (
+      triggerButton
+    ) : (
+      <OnboardingFooter className="max-w-none">
+        {triggerButton}
+      </OnboardingFooter>
+    );
+  }
+
+  const trigger = <DialogTrigger asChild>{triggerButton}</DialogTrigger>;
+
   return (
     <Dialog>
       {inline ? (
@@ -103,17 +114,7 @@ export function IdentityKeyHelpDialog({
             className="mt-6 space-y-4 text-pretty text-base leading-7 text-[color:var(--buzz-onboarding-backup-ink)]"
           >
             <div>
-              <p>
-                Buzz will create a Nostr identity with two parts: a private key
-                that signs you in and a public key you can safely share. You can
-                find your public identity anytime in Buzz settings.
-              </p>
-              <p>
-                This identity belongs to you, not Buzz, and can move with you to
-                another device or compatible Nostr app. Because only you control
-                the private key, Buzz can’t reset or recover it. Keep a backup
-                somewhere safe, and never share it.
-              </p>
+              <IdentityKeyHelpBody />
             </div>
           </DialogDescription>
         </div>
@@ -121,3 +122,35 @@ export function IdentityKeyHelpDialog({
     </Dialog>
   );
 }
+
+function IdentityKeyHelpBody() {
+  return (
+    <>
+      <p>
+        Buzz will create a Nostr identity with two parts: a private key that
+        signs you in and a public key you can safely share. You can find your
+        public identity anytime in Buzz settings.
+      </p>
+      <p>
+        This identity belongs to you, not Buzz, and can move with you to another
+        device or compatible Nostr app. Because only you control the private
+        key, Buzz can’t reset or recover it. Keep a backup somewhere safe, and
+        never share it.
+      </p>
+    </>
+  );
+}
+
+/** Production identity-key explainer content in the V3 onboarding card treatment. */
+export function IdentityKeyHelpPreviewContent() {
+  return (
+    <>
+      <h1 className="text-title font-normal text-foreground">
+        What’s an identity key?
+      </h1>
+      <div className="mt-2 max-w-[500px] space-y-4 text-pretty text-base leading-7 text-foreground/80">
+        <IdentityKeyHelpBody />
+      </div>
+    </>
+  );
+}
diff --git a/desktop/src/features/onboarding/ui/KeySignInPreview.tsx b/desktop/src/features/onboarding/ui/KeySignInPreview.tsx
index 8256b7d5ae..f29b14749c 100644
--- a/desktop/src/features/onboarding/ui/KeySignInPreview.tsx
+++ b/desktop/src/features/onboarding/ui/KeySignInPreview.tsx
@@ -82,7 +82,12 @@ export function KeySignInPreview({
             <h1 className="text-title font-normal text-foreground">
               Enter your private key
             </h1>
-            <div className="mt-5 max-w-[440px] text-sm leading-6 text-foreground/80">
+            <div
+              className={cn(
+                "max-w-[440px] text-sm leading-6 text-foreground/80",
+                cardLayout ? "mt-2" : "mt-5",
+              )}
+            >
               <p>
                 Paste your private key to sign in to Buzz. You can also use a{" "}
                 <button
diff --git a/desktop/src/features/onboarding/ui/OnboardingPreviewApp.tsx b/desktop/src/features/onboarding/ui/OnboardingPreviewApp.tsx
index de11807843..97d06435b6 100644
--- a/desktop/src/features/onboarding/ui/OnboardingPreviewApp.tsx
+++ b/desktop/src/features/onboarding/ui/OnboardingPreviewApp.tsx
@@ -19,6 +19,7 @@ import {
 } from "./EncryptedBackupCreator";
 import { JoinPolicyNotice } from "./JoinPolicyNotice";
 import { KeySignInPreview } from "./KeySignInPreview";
+import { IdentityKeyHelpPreviewContent } from "./IdentityKeyHelpDialog";
 import { LandingBees } from "./LandingBees";
 import {
   ONBOARDING_LANDING_CTA_CLASS,
@@ -760,6 +761,7 @@ export function OnboardingPreviewApp() {
           direction="forward"
           lockedBackupCreated={backupSession.created}
           onNext={() => setPage("identity-key")}
+          onOpenIdentityKeyHelp={() => setPage("identity-key-help")}
           onOpenPasswordBackup={() => setPage("backup-password")}
           onShowOptions={() => setPage("backup-options")}
           optionsExpanded
@@ -768,6 +770,21 @@ export function OnboardingPreviewApp() {
         />
       </OnboardingPreviewStep>
     );
+  } else if (page === "identity-key-help") {
+    content = (
+      <OnboardingPreviewStep
+        onBack={() => setPage("backup-options")}
+        testId="onboarding-preview-identity-key-help"
+        total={journey.totalSteps}
+      >
+        <OnboardingSlideTransition
+          className="flex min-h-0 w-full max-w-[560px] flex-col items-stretch justify-start text-left"
+          transitionKey="preview-identity-key-help"
+        >
+          <IdentityKeyHelpPreviewContent />
+        </OnboardingSlideTransition>
+      </OnboardingPreviewStep>
+    );
   } else if (page === "backup-password") {
     content = (
       <BackupPasswordPreview
diff --git a/desktop/src/features/onboarding/ui/OnboardingPreviewControls.tsx b/desktop/src/features/onboarding/ui/OnboardingPreviewControls.tsx
index d7d3e7e43d..8b4d498de7 100644
--- a/desktop/src/features/onboarding/ui/OnboardingPreviewControls.tsx
+++ b/desktop/src/features/onboarding/ui/OnboardingPreviewControls.tsx
@@ -20,7 +20,8 @@ export function OnboardingPreviewControls({
 }) {
   return (
     <aside
-      className="fixed right-4 top-4 z-[100] flex w-[320px] max-w-[calc(100vw-2rem)] flex-col gap-3 rounded-2xl border border-foreground/15 bg-background/95 px-4 py-3 text-left shadow-lg backdrop-blur"
+      className="buzz-onboarding-neutral-theme fixed right-4 top-4 z-[100] flex w-[320px] max-w-[calc(100vw-2rem)] flex-col gap-3 rounded-2xl border border-foreground/15 bg-background/95 px-4 py-3 text-left shadow-lg backdrop-blur"
+      data-system-color-scheme="light"
       data-testid="onboarding-preview-banner"
     >
       <div className="flex items-center gap-3">
@@ -35,7 +36,7 @@ export function OnboardingPreviewControls({
         </div>
         <Button
           aria-label="Restart onboarding preview"
-          className="h-8 w-8 shrink-0"
+          className="h-8 w-8 shrink-0 text-foreground hover:text-foreground"
           data-testid="onboarding-preview-restart"
           onClick={onRestart}
           size="icon"
diff --git a/desktop/src/features/onboarding/ui/OnboardingPreviewJourney.tsx b/desktop/src/features/onboarding/ui/OnboardingPreviewJourney.tsx
index b9cc92546e..f052a1daa4 100644
--- a/desktop/src/features/onboarding/ui/OnboardingPreviewJourney.tsx
+++ b/desktop/src/features/onboarding/ui/OnboardingPreviewJourney.tsx
@@ -320,7 +320,12 @@ export function CommunityChoicePreview({
               ? "Join or create a community"
               : "Buzz happens in communities"}
           </h1>
-          <p className="mt-3 text-sm leading-6 text-foreground/80">
+          <p
+            className={cn(
+              "text-sm leading-6 text-foreground/80",
+              cardLayout ? "mt-2" : "mt-3",
+            )}
+          >
             {includeExistingCommunity
               ? "Join with an invite, create your own community, or reconnect one you already have."
               : "Communities are shared spaces where people and agents work together."}
@@ -420,7 +425,12 @@ export function CommunityEntryPreview({
       >
         <div className="w-full max-w-[620px]">
           <h1 className="text-title font-normal">{heading}</h1>
-          <p className="mt-3 text-sm leading-6 text-foreground/80">
+          <p
+            className={cn(
+              "text-sm leading-6 text-foreground/80",
+              cardLayout ? "mt-2" : "mt-3",
+            )}
+          >
             {route === "existing"
               ? "Enter the community URL or an invite link. Your role will be restored when you connect."
               : previewVariant === "v3"
diff --git a/desktop/src/features/onboarding/ui/OnboardingPreviewShell.tsx b/desktop/src/features/onboarding/ui/OnboardingPreviewShell.tsx
index e03b784382..75ee3a0c2c 100644
--- a/desktop/src/features/onboarding/ui/OnboardingPreviewShell.tsx
+++ b/desktop/src/features/onboarding/ui/OnboardingPreviewShell.tsx
@@ -75,7 +75,7 @@ export function OnboardingPreviewStep({
       {cardLayout ? (
         <Card
           className={cn(
-            "flex h-[min(41.5rem,calc(100dvh-3rem))] w-full max-w-[47rem] flex-col overflow-hidden rounded-[2rem] bg-white px-6 pb-6 pt-[4.5rem] text-left shadow-lg sm:px-[7.5rem] [&_.buzz-onboarding-transition-content]:!text-left [&_.buzz-onboarding-transition-line]:justify-start [&_h1+p]:!mx-0 [&_h1+p]:!mt-2 [&_h1+p]:!text-left [&_h1+p]:!text-base [&_h1+p]:!leading-6 [&_h1]:!text-left [&_h1]:!text-2xl [&_h1]:!leading-8 [&_h1]:!text-foreground",
+            "flex h-[min(41.5rem,calc(100dvh-3rem))] w-full max-w-[47rem] flex-col overflow-hidden rounded-[2rem] bg-white px-6 pb-6 pt-[4.5rem] text-left shadow-lg [--buzz-onboarding-cta-label:#fff] sm:px-[7.5rem] [&_.buzz-onboarding-transition-content]:!text-left [&_.buzz-onboarding-transition-line]:justify-start [&_h1+p]:!mx-0 [&_h1+p]:!mt-2 [&_h1+p]:!text-left [&_h1+p]:!text-base [&_h1+p]:!leading-6 [&_h1]:!text-left [&_h1]:!text-2xl [&_h1]:!leading-8 [&_h1]:!text-foreground",
           )}
           data-testid="onboarding-preview-content-card"
           ref={cardRef}