diff --git a/docs/app/(home)/page.tsx b/docs/app/(home)/page.tsx
index 448f00e12..a0234519c 100644
--- a/docs/app/(home)/page.tsx
+++ b/docs/app/(home)/page.tsx
@@ -25,8 +25,6 @@ export default function HomePage() {
           align="left"
           subtitle="Open Standard for Generative UI"
           showPlaygroundButton={false}
-          githubRepoUrl="https://github.com/thesysdev/openui"
-          githubButtonLabel="Star us on GitHub"
           showTagline={false}
         />
         <LogoStrip />
diff --git a/docs/app/(home)/sections/StackDiagramSection/StackDiagramSection.module.css b/docs/app/(home)/sections/StackDiagramSection/StackDiagramSection.module.css
index f55951d43..c643bc07e 100644
--- a/docs/app/(home)/sections/StackDiagramSection/StackDiagramSection.module.css
+++ b/docs/app/(home)/sections/StackDiagramSection/StackDiagramSection.module.css
@@ -169,7 +169,7 @@
   z-index: 0;
   display: flex;
   align-items: stretch;
-  gap: 0.25rem;
+  gap: 0.3125rem;
   pointer-events: none;
 }
 
@@ -185,7 +185,7 @@
 .rail {
   position: relative;
   flex: 0 0 auto;
-  width: 0.625rem;
+  width: 0.875rem;
   align-self: stretch;
   min-height: 4rem;
   overflow: hidden;
@@ -214,6 +214,13 @@
   animation: railDown 3.2s linear infinite;
 }
 
+/* Offset the second lane of each pair so neighbours do not march in lockstep,
+   which would read as one wide lane rather than two. */
+.rails > :nth-child(2) .railTrack,
+.rails > :nth-child(4) .railTrack {
+  animation-delay: -1.6s;
+}
+
 @keyframes railUp {
   from {
     transform: translateY(0);
@@ -234,8 +241,8 @@
 
 .chevron {
   flex: 0 0 auto;
-  width: 0.625rem;
-  height: 0.3125rem;
+  width: 0.875rem;
+  height: 0.4375rem;
   opacity: 0.5;
 }
 
@@ -269,7 +276,6 @@
   flex: 0 1 auto;
 }
 
-/* Title on the left; everything after it rides to the right edge. */
 /* Title row: vertically centred, with the arrow pinned to the right edge. */
 .contentSplit {
   align-items: center;
@@ -590,15 +596,9 @@
   }
 
   .rail {
-    width: 0.75rem;
     min-height: 5.5rem;
   }
 
-  .chevron {
-    width: 0.75rem;
-    height: 0.375rem;
-  }
-
   /* The description becomes a sheet that rises from the bottom on tap. */
   .trayBackdrop {
     display: block;
diff --git a/docs/app/(home)/sections/StackDiagramSection/StackDiagramSection.tsx b/docs/app/(home)/sections/StackDiagramSection/StackDiagramSection.tsx
index 71976517d..4c5d852ed 100644
--- a/docs/app/(home)/sections/StackDiagramSection/StackDiagramSection.tsx
+++ b/docs/app/(home)/sections/StackDiagramSection/StackDiagramSection.tsx
@@ -252,7 +252,7 @@ export function StackDiagramSection() {
                   <span className={styles.itemIcon}>
                     <Browser size={ICON_SIZE} />
                   </span>
-                  <span className={styles.itemTitle}>App surface</span>
+                  <span className={styles.itemTitle}>Agent Interface</span>
                 </div>
                 <span className={styles.layerArrow}>
                   <ArrowRight size={12} weight="bold" />
@@ -276,8 +276,12 @@ export function StackDiagramSection() {
           </div>
 
           <div className={styles.connector}>
+            {/* Four lanes: the left pair streams UI up, the right pair carries
+                actions down. */}
             <span className={styles.rails}>
               <Rail direction="up" />
+              <Rail direction="up" />
+              <Rail direction="down" />
               <Rail direction="down" />
             </span>
             <div className={styles.langLayer}>