diff --git a/src/app/app.css b/src/app/app.css
index 0a328b36..a5df3189 100644
--- a/src/app/app.css
+++ b/src/app/app.css
@@ -567,7 +567,7 @@ button:disabled {
 
 .viewport-region {
   display: grid;
-  grid-template-rows: auto minmax(0, 1fr);
+  grid-template-rows: minmax(0, 1fr);
   min-height: 0;
   background: rgba(20, 24, 31, 0.92);
   border: 1px solid var(--color-border);
@@ -586,69 +586,6 @@ button:disabled {
   box-shadow: var(--shadow-panel);
 }
 
-.viewport-region__header {
-  display: flex;
-  align-items: flex-start;
-  justify-content: space-between;
-  gap: 12px;
-  padding: 0 18px;
-  background: linear-gradient(90deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0) 100%);
-  border-bottom: 1px solid var(--color-border);
-  flex-wrap: wrap;
-}
-
-.viewport-region__meta {
-  display: flex;
-  flex-direction: column;
-  align-items: flex-start;
-  gap: 4px;
-  min-width: 0;
-  flex: 1 1 420px;
-  padding: 12px 0;
-}
-
-.viewport-region__title {
-  font-size: 0.76rem;
-  font-weight: 700;
-  letter-spacing: 0.16em;
-  text-transform: uppercase;
-}
-
-.viewport-region__caption {
-  color: var(--color-muted);
-  font-size: 0.82rem;
-  min-width: 0;
-}
-
-.viewport-region__active-panel {
-  color: #dbe5f4;
-  font-size: 0.76rem;
-  font-weight: 600;
-}
-
-.viewport-region__layout-toggle {
-  display: flex;
-  align-items: center;
-  gap: 6px;
-  padding: 6px;
-  background: rgba(255, 255, 255, 0.02);
-  border: 1px solid var(--color-border);
-  border-radius: 14px;
-  flex-wrap: wrap;
-  margin-block: 10px;
-}
-
-.viewport-region__layout-button {
-  padding: 0.45rem 0.7rem;
-  font-size: 0.78rem;
-}
-
-.viewport-region__layout-button--active {
-  background: var(--color-accent-soft);
-  border-color: rgba(207, 123, 66, 0.55);
-  color: var(--color-accent-strong);
-}
-
 .viewport-region__panels {
   min-height: 0;
 }