diff --git a/website/src/components/header/header.astro b/website/src/components/header/header.astro
index 455a7feccd7..80552fdebff 100644
--- a/website/src/components/header/header.astro
+++ b/website/src/components/header/header.astro
@@ -15,11 +15,14 @@ const { noLinks } = Astro.props;
   .navbar {
     display: flex;
     align-items: center;
+    flex-wrap: wrap;
+    row-gap: 0.25rem;
     background-color: var(--colorNeutralBackground3);
     padding: 0.5rem 1rem;
     margin: 0;
     box-shadow: var(--shadow4);
-    height: var(--header-height);
+    min-height: var(--header-height);
+    box-sizing: border-box;
   }
   #header-drawer-button {
     display: flex;
@@ -28,6 +31,25 @@ const { noLinks } = Astro.props;
     border: none;
   }
 
+  /* On documentation pages Starlight renders its own sidebar menu button in the
+     same corner. Hide this site menu button there so the two hamburger controls
+     don't overlap. The site links stay reachable from the Starlight menu (see
+     Sidebar override). (#10795 Reflow / #10796 Resize Text) */
+  :global([data-has-sidebar]) #header-drawer-button {
+    display: none;
+  }
+
+  /* Below 50rem Starlight overlays a fixed sidebar menu button in the top-right
+     corner. Reserve room for it (mirrors Starlight's own header padding) so it
+     doesn't overlap the search button. (#10795 Reflow / #10796 Resize Text) */
+  @media (max-width: 50rem) {
+    :global([data-has-sidebar]) .navbar {
+      padding-inline-end: calc(
+        var(--sl-nav-gap) + var(--sl-nav-pad-x) + var(--sl-menu-button-size)
+      );
+    }
+  }
+
   .nav-content {
     display: none;
   }
@@ -143,6 +165,9 @@ const { noLinks } = Astro.props;
     .nav-content {
       display: flex;
       flex: 1;
+      flex-wrap: wrap;
+      align-items: center;
+      gap: 0.25rem 0.5rem;
       position: relative;
     }
 
@@ -158,7 +183,8 @@ const { noLinks } = Astro.props;
     .items {
       display: flex;
       align-items: center;
-      flex: 1;
+      flex-wrap: wrap;
+      flex: 1 1 auto;
       min-width: 0;
     }
 
diff --git a/website/src/components/release-notification.astro b/website/src/components/release-notification.astro
index b53ce130ce2..bae9b05553c 100644
--- a/website/src/components/release-notification.astro
+++ b/website/src/components/release-notification.astro
@@ -37,9 +37,11 @@ import Link from "@typespec/astro-utils/components/link.astro";
   .new-version-banner {
     border: 1px solid var(--colorBrandBackground);
     display: block;
-    padding: 2px 1rem;
+    padding: 2px 0.6rem;
     border-radius: 2px;
-    line-height: 24px;
+    line-height: 22px;
+    font-size: 0.875rem;
+    white-space: nowrap;
   }
   .new-version-banner:hover {
     outline: 1px solid var(--colorBrandBackgroundHover);
@@ -47,6 +49,16 @@ import Link from "@typespec/astro-utils/components/link.astro";
   .hide {
     display: none;
   }
+
+  /* In the desktop header the version banner sits inline with the nav links.
+     Between 1024px and ~1200px there isn't room for it without the header
+     wrapping to a second row, so hide it in that range. Below 1024px it moves
+     into the mobile drawer (a vertical list) where it fits fine. (#10794) */
+  @media (min-width: 1024px) and (max-width: 1200px) {
+    .new-version-banner {
+      display: none;
+    }
+  }
 </style>
 
 <Link
diff --git a/website/src/components/starlight-overrides/PageFrame.astro b/website/src/components/starlight-overrides/PageFrame.astro
index ee81027dad1..c2de0a5fe11 100644
--- a/website/src/components/starlight-overrides/PageFrame.astro
+++ b/website/src/components/starlight-overrides/PageFrame.astro
@@ -14,6 +14,25 @@ import Footer from "../footer/footer.astro";
   </div>
 </Default>
 
+<script>
+  // Starlight positions the page content and sidebar using a fixed
+  // `--sl-nav-height`. The site header can grow taller than that single-row
+  // height when its content wraps (e.g. under text resize or reflow / zoom),
+  // which made it overflow and overlap the navigation and content below.
+  // Keep `--sl-nav-height` in sync with the real header height so everything
+  // reflows correctly. (Resize Text 1.4.4 & Reflow 1.4.10.)
+  function setupNavHeightSync() {
+    const navbar = document.querySelector<HTMLElement>("header.header nav.navbar");
+    if (!navbar) return;
+    const sync = () =>
+      document.documentElement.style.setProperty("--sl-nav-height", `${navbar.offsetHeight}px`);
+    sync();
+    new ResizeObserver(sync).observe(navbar);
+    window.addEventListener("resize", sync);
+  }
+  setupNavHeightSync();
+</script>
+
 <style>
   .footer-wrapper {
     position: relative;
diff --git a/website/src/components/starlight-overrides/Sidebar.astro b/website/src/components/starlight-overrides/Sidebar.astro
index 4601c965b92..6dcc88ecf56 100644
--- a/website/src/components/starlight-overrides/Sidebar.astro
+++ b/website/src/components/starlight-overrides/Sidebar.astro
@@ -2,8 +2,24 @@
 import MobileMenuFooter from "@astrojs/starlight/components/MobileMenuFooter.astro";
 import SidebarPersister from "@astrojs/starlight/components/SidebarPersister.astro";
 import SidebarSublist from "@astrojs/starlight/components/SidebarSublist.astro";
+import Link from "@typespec/astro-utils/components/link.astro";
 import { getCollection } from "astro:content";
 
+// Primary site navigation. On documentation pages the site header's own menu
+// button is hidden so it doesn't overlap Starlight's sidebar menu button
+// (#10795 / #10796). Surface those links here (mobile menu only) so they stay
+// reachable from the single remaining menu button.
+const primaryNav = [
+  { label: "OpenAPI", href: "/openapi" },
+  { label: "Data Validation", href: "/data-validation" },
+  { label: "Tooling support", href: "/tooling" },
+  { label: "Docs", href: "/docs" },
+  { label: "Videos", href: "/videos" },
+  { label: "Playground", href: "/playground" },
+  { label: "Blog", href: "/blog" },
+  { label: "Community", href: "/community" },
+];
+
 const { sidebar } = Astro.locals.starlightRoute;
 const pathname = Astro.url.pathname;
 const base = import.meta.env.BASE_URL;
@@ -42,6 +58,18 @@ if (isReleaseNotes) {
 }
 ---
 
+<nav class="site-nav md:sl-hidden" aria-label="Site">
+  <ul>
+    {
+      primaryNav.map((entry) => (
+        <li>
+          <Link href={entry.href}>{entry.label}</Link>
+        </li>
+      ))
+    }
+  </ul>
+</nav>
+
 <SidebarPersister>
   <SidebarSublist sublist={filtered} />
 </SidebarPersister>
@@ -49,3 +77,29 @@ if (isReleaseNotes) {
 <div class="md:sl-hidden">
   <MobileMenuFooter />
 </div>
+
+<style>
+  .site-nav {
+    border-bottom: 1px solid var(--sl-color-hairline-shade);
+    padding-bottom: 1rem;
+    margin-bottom: 0.5rem;
+  }
+  .site-nav ul {
+    list-style: none;
+    padding: 0;
+    margin: 0;
+    display: flex;
+    flex-direction: column;
+    gap: 0.25rem;
+  }
+  .site-nav a {
+    display: block;
+    padding: 0.4rem 0;
+    color: var(--sl-color-white);
+    text-decoration: none;
+    font-weight: 600;
+  }
+  .site-nav a:hover {
+    color: var(--sl-color-text-accent);
+  }
+</style>
diff --git a/website/src/components/window-carousel.astro b/website/src/components/window-carousel.astro
index 32c9606cf14..5a4ce0a5f4b 100644
--- a/website/src/components/window-carousel.astro
+++ b/website/src/components/window-carousel.astro
@@ -1,6 +1,11 @@
 ---
 import Window from "./window.astro";
 const tabs = Object.keys(Astro.slots);
+const slug = (name: string) =>
+  name
+    .toLowerCase()
+    .replace(/[^a-z0-9]+/g, "-")
+    .replace(/^-+|-+$/g, "");
 ---
 
 <style>
@@ -50,19 +55,29 @@ const tabs = Object.keys(Astro.slots);
     list-style: none;
   }
 
-  a[role="tab"] {
+  a[role="tab"],
+  button[role="tab"] {
     display: block;
     color: var(--colorNeutralForeground2);
     cursor: pointer;
     padding-bottom: 3px;
     border-bottom: 2px solid transparent;
   }
-  a[role="tab"]:hover {
+  button[role="tab"] {
+    background: none;
+    border-top: none;
+    border-left: none;
+    border-right: none;
+    font: inherit;
+  }
+  a[role="tab"]:hover,
+  button[role="tab"]:hover {
     color: var(--colorBrandForeground1);
     cursor: pointer;
     border-bottom-color: var(--colorBrandForeground1);
   }
-  a[role="tab"][aria-selected="true"] {
+  a[role="tab"][aria-selected="true"],
+  button[role="tab"][aria-selected="true"] {
     border-bottom-color: var(--colorBrandForeground1);
   }
 </style>
@@ -73,25 +88,33 @@ const tabs = Object.keys(Astro.slots);
       tabs.map(async (name, i) => {
         const render = await Astro.slots.render(name);
         return (
-          <Window class:list={["item", i === 0 && "item-selected"]} role="tabpanel">
+          <Window
+            class:list={["item", i === 0 && "item-selected"]}
+            id={`carousel-panel-${slug(name)}`}
+            role="tabpanel"
+            aria-labelledby={`carousel-tab-${slug(name)}`}
+            tabindex="0"
+          >
             <Fragment set:html={render} />
           </Window>
         );
       })
     }
   </div>
-  <ul role="tablist">
+  <ul role="tablist" aria-label="Sample views">
     {
       tabs.map((name, i) => (
         <li role="presentation" class="tab">
-          <a
+          <button
+            type="button"
             role="tab"
-            id={name}
+            id={`carousel-tab-${slug(name)}`}
+            aria-controls={`carousel-panel-${slug(name)}`}
             aria-selected={i === 0 ? "true" : "false"}
             tabindex={i !== 0 ? -1 : 0}
           >
             {name}
-          </a>
+          </button>
         </li>
       ))
     }
@@ -100,15 +123,14 @@ const tabs = Object.keys(Astro.slots);
 
 <script>
   class CarouselTabs extends HTMLElement {
-    tabs: HTMLAnchorElement[];
+    tabs: HTMLButtonElement[];
     panels: HTMLElement[];
 
     constructor() {
       super();
       const tablist = this.querySelector<HTMLUListElement>('[role="tablist"]')!;
-      this.tabs = [...tablist.querySelectorAll<HTMLAnchorElement>('[role="tab"]')];
+      this.tabs = [...tablist.querySelectorAll<HTMLButtonElement>('[role="tab"]')];
       this.panels = [...this.querySelectorAll<HTMLElement>('[role="tabpanel"]')];
-      console.log("register", this.tabs);
 
       this.panels.forEach((panel, i) => {
         panel.addEventListener("click", (e) => {
@@ -122,7 +144,7 @@ const tabs = Object.keys(Astro.slots);
           e.preventDefault();
           const currentTab = tablist.querySelector('[aria-selected="true"]');
           if (e.currentTarget !== currentTab) {
-            this.switchTab(e.currentTarget as HTMLAnchorElement, i);
+            this.switchTab(e.currentTarget as HTMLButtonElement, i);
           }
         });
 
@@ -150,7 +172,7 @@ const tabs = Object.keys(Astro.slots);
       });
     }
 
-    switchTab(newTab: HTMLAnchorElement | null | undefined, index: number, shouldSync = true) {
+    switchTab(newTab: HTMLButtonElement | null | undefined, index: number, shouldSync = true) {
       if (!newTab) return;
 
       // If tabs should be synced, we store the current position so we can restore it after
@@ -169,7 +191,6 @@ const tabs = Object.keys(Astro.slots);
 
       // Show new panel and mark new tab as selected.
       const newPanel = this.panels[index];
-      console.log("Switch", newPanel, this.panels);
       if (newPanel) newPanel.classList.add("item-selected");
       // Restore active tab to the default tab order.
       newTab.removeAttribute("tabindex");
diff --git a/website/src/content.config.ts b/website/src/content.config.ts
index 12a246a22d2..2ffe07f01c9 100644
--- a/website/src/content.config.ts
+++ b/website/src/content.config.ts
@@ -1,5 +1,5 @@
-import { docsLoader } from "@astrojs/starlight/loaders";
-import { docsSchema } from "@astrojs/starlight/schema";
+import { docsLoader, i18nLoader } from "@astrojs/starlight/loaders";
+import { docsSchema, i18nSchema } from "@astrojs/starlight/schema";
 import { llmstxtSchema } from "@typespec/astro-utils/llmstxt/schema";
 import { glob } from "astro/loaders";
 import { z } from "astro/zod";
@@ -46,4 +46,5 @@ export const collections = {
       authors: z.array(authorSchema).optional(),
     }),
   }),
+  i18n: defineCollection({ loader: i18nLoader(), schema: i18nSchema() }),
 };
diff --git a/website/src/content/i18n/en.json b/website/src/content/i18n/en.json
new file mode 100644
index 00000000000..eab5a158fe7
--- /dev/null
+++ b/website/src/content/i18n/en.json
@@ -0,0 +1,3 @@
+{
+  "sidebarNav.accessibleLabel": "Documentation"
+}
diff --git a/website/src/layouts/base-layout.astro b/website/src/layouts/base-layout.astro
index 4d22634c126..f61eaf53dec 100644
--- a/website/src/layouts/base-layout.astro
+++ b/website/src/layouts/base-layout.astro
@@ -29,11 +29,12 @@ const initJsIntegrity = computeSriHash("1ds-init.js");
     ></script>
   </head>
   <body class="body">
+    <a href="#main-content" class="skip-link">Skip to main content</a>
     <header class="header">
       <Header />
     </header>
     <!-- pt is set according to the height of the header -->
-    <main class="main">
+    <main id="main-content" tabindex="-1" class="main">
       <slot />
     </main>
     {footer && <Footer />}
@@ -41,20 +42,43 @@ const initJsIntegrity = computeSriHash("1ds-init.js");
   <style>
     body {
       margin: 0;
-      height: 100vh;
+      min-height: 100vh;
       display: flex;
       flex-direction: column;
     }
 
+    .skip-link {
+      position: absolute;
+      top: 0;
+      left: 0;
+      z-index: 1000;
+      padding: 0.5rem 1rem;
+      background-color: var(--colorNeutralBackground1);
+      color: var(--colorBrandForeground1);
+      border: 1px solid var(--colorBrandForeground1);
+      border-radius: 0 0 4px 0;
+      text-decoration: none;
+      /* Visually hidden until focused, but kept in the tab order. */
+      transform: translateY(-100%);
+    }
+
+    .skip-link:focus-visible,
+    .skip-link:focus {
+      transform: translateY(0);
+    }
+
+    .main:focus {
+      outline: none;
+    }
+
     .main {
       flex: 1;
-      margin-top: var(--header-height);
       background-color: var(--colorNeutralBackground1);
     }
 
     .header {
-      position: fixed;
-      width: 100vw;
+      position: sticky;
+      top: 0;
       z-index: 500;
     }
     .footer {