diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8ea8c10..b885435 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project follows [Semantic Versioning](https://semver.org/).
 
 ## [Unreleased]
 
+### Fixed
+
+- Help guide popups could render taller than the screen on mobile, with no way to reach the close button or "Got it" button: only the tab content area had a height cap, so the header, quick links, and footer weren't accounted for. The whole popup is now capped to the screen height, with just the tab content scrolling internally.
+
 ## [1.5.2] - 2026-08-07
 
 ### Fixed
diff --git a/frontend/src/components/shared/HelpGuideModal.tsx b/frontend/src/components/shared/HelpGuideModal.tsx
index b2f2f94..c69ba9b 100644
--- a/frontend/src/components/shared/HelpGuideModal.tsx
+++ b/frontend/src/components/shared/HelpGuideModal.tsx
@@ -17,10 +17,10 @@ export default function HelpGuideModal({ content, onClose }: { content: HelpCont
       <div className="absolute inset-0 bg-black/40 animate-in fade-in duration-200" onClick={onClose} />
       <div className="absolute inset-0 flex items-center justify-center p-4">
         <div
-          className="w-full max-w-3xl bg-white rounded-2xl shadow-2xl animate-in fade-in zoom-in-95 slide-in-from-bottom-2 duration-200 overflow-hidden"
+          className="w-full max-w-3xl max-h-full bg-white rounded-2xl shadow-2xl animate-in fade-in zoom-in-95 slide-in-from-bottom-2 duration-200 overflow-hidden flex flex-col"
           onClick={e => e.stopPropagation()}
         >
-          <div className="flex items-start justify-between px-5 py-4 border-b bg-gradient-to-r from-brand-50/60 to-white">
+          <div className="flex items-start justify-between px-5 py-4 border-b bg-gradient-to-r from-brand-50/60 to-white shrink-0">
             <div className="flex items-start gap-3">
               <div className="w-9 h-9 rounded-full bg-brand-50 flex items-center justify-center shrink-0">
                 <MessageCircleQuestion className="w-5 h-5 text-brand-600" />
@@ -36,7 +36,7 @@ export default function HelpGuideModal({ content, onClose }: { content: HelpCont
           </div>
 
           {content.quickLinks && content.quickLinks.length > 0 && (
-            <div className="flex flex-wrap gap-2 px-5 py-3 border-b bg-gray-50">
+            <div className="flex flex-wrap gap-2 px-5 py-3 border-b bg-gray-50 shrink-0">
               {content.quickLinks.map(link => (
                 <Link
                   key={link.href}
@@ -51,9 +51,9 @@ export default function HelpGuideModal({ content, onClose }: { content: HelpCont
             </div>
           )}
 
-          <div className="flex flex-col sm:flex-row">
+          <div className="flex flex-col sm:flex-row flex-1 min-h-0 overflow-y-auto sm:overflow-visible">
             {content.tabs.length > 1 && (
-              <nav className="sm:w-56 shrink-0 border-b sm:border-b-0 sm:border-r p-3 space-y-1 bg-gray-50/50">
+              <nav className="sm:w-56 shrink-0 border-b sm:border-b-0 sm:border-r p-3 space-y-1 bg-gray-50/50 sm:overflow-y-auto">
                 {content.tabs.map(t => {
                   const Icon = t.icon;
                   const active = activeTab?.key === t.key;
@@ -72,12 +72,12 @@ export default function HelpGuideModal({ content, onClose }: { content: HelpCont
               </nav>
             )}
 
-            <div className="flex-1 min-w-0 p-5 text-sm text-gray-700 max-h-[60vh] overflow-auto">
+            <div className="flex-1 min-w-0 p-5 text-sm text-gray-700 sm:overflow-y-auto">
               {activeTab?.content}
             </div>
           </div>
 
-          <div className="border-t px-5 py-3 space-y-2 bg-gray-50/50">
+          <div className="border-t px-5 py-3 space-y-2 bg-gray-50/50 shrink-0">
             {content.supportContact && (
               <div className="flex items-center gap-2 text-xs text-gray-500">
                 <Mail className="w-3.5 h-3.5 shrink-0" />