diff --git a/frontend/src/design-system/base.css b/frontend/src/design-system/base.css
index 115eabef..bf4947ab 100644
--- a/frontend/src/design-system/base.css
+++ b/frontend/src/design-system/base.css
@@ -122,3 +122,12 @@ button, .p-button, .ks-button {
 .p-dialog-footer, .ks-dialog__footer {
   padding: var(--ks-space-3) var(--ks-space-4) !important;
 }
+
+/* Global Footer Exclusion: Single-Screen Principle */
+/* All footers hidden (both page-level and global) to maximize content area */
+/* Structure preserved for backward compatibility; CSS hiding only */
+.ks-page__footer,
+.ks-shell__footer,
+footer[class*="ks-"] {
+  display: none !important; /* Maximize viewport for content; all controls → header/command-bar/summary */
+}
diff --git a/frontend/src/shared/ui/layouts/AppShellLayout.vue b/frontend/src/shared/ui/layouts/AppShellLayout.vue
index e8299a92..9fa3449d 100644
--- a/frontend/src/shared/ui/layouts/AppShellLayout.vue
+++ b/frontend/src/shared/ui/layouts/AppShellLayout.vue
@@ -22,7 +22,6 @@ const appVersion = import.meta.env.VITE_APP_VERSION ?? '0.1.0'
 .ks-shell__boundary { padding: var(--ks-space-2) var(--ks-space-3); border: 1px solid #fbbf24; border-radius: var(--ks-radius-sm); color: #fef3c7; }
 .ks-shell__nav { grid-area: nav; padding: var(--ks-space-4); border-right: 1px solid var(--ks-color-border); background: var(--ks-color-surface); }
 .ks-shell__main { grid-area: main; min-width: 0; padding: var(--ks-space-6); }
-.ks-shell__footer { display: none; /* Footer excluded: maximize content area */ }
 .ks-skip { position: fixed; left: var(--ks-space-2); top: -4rem; z-index: 1000; padding: var(--ks-space-2); background: var(--ks-color-surface); } .ks-skip:focus { top: var(--ks-space-2); }
 @media (max-width: 1100px) { .ks-shell { grid-template-columns: 1fr; grid-template-areas: 'header' 'nav' 'main' 'footer'; } .ks-shell__header { align-items: flex-start; flex-direction: column; } .ks-shell__nav { border-right: 0; border-bottom: 1px solid var(--ks-color-neutral-200); } }
 </style>
diff --git a/frontend/src/shared/ui/layouts/PageLayout.vue b/frontend/src/shared/ui/layouts/PageLayout.vue
index d60cf45b..6896825e 100644
--- a/frontend/src/shared/ui/layouts/PageLayout.vue
+++ b/frontend/src/shared/ui/layouts/PageLayout.vue
@@ -109,6 +109,5 @@ const showHelp = ref(false)
 .ks-page__workspace { min-width: 0; flex: 1; display: grid; min-height: 0; gap: var(--ks-space-4); }
 .ks-page__workspace.has-aside { grid-template-columns: minmax(0, 1fr) var(--ks-aside-width); }
 .ks-page__content, .ks-page__aside { min-width: 0; min-height: 0; height: 100%; display: flex; flex-direction: column; }
-.ks-page__footer { display: none; /* Footer excluded: all controls → header/command-bar/summary */ }
 @media (max-width: 1100px) { .ks-page__workspace.has-aside { grid-template-columns: 1fr; } }
 </style>