diff --git a/AGENTS.md b/AGENTS.md
index f70bb6b..f339cd7 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -27,7 +27,7 @@ bun dist/server.js       # wrong: crashes with 'Bundled file "./index-….js" no
   and the `../../shared/credits.css` link in the page's HTML, and call `mountCredits()` from
   `src/shared/credits.ts`. Never write your own notice text.
 - Mockup agents edit only their own `src/mockups/NN-slug/` folder. `src/data/`, `src/shared/`,
-  `src/server.ts`, `src/index.html` and `src/mockups/registry.ts` are the shared contract; change them
+  `src/server.ts`, `src/mockups/index.html` and `src/mockups/registry.ts` are the shared contract; change them
   only when the plan says so.
 - No two mockups may have byte-identical `style.css` — the build fails with
   "Multiple files share the same output path". Give each one its own styles from the start.
@@ -38,7 +38,7 @@ bun dist/server.js       # wrong: crashes with 'Bundled file "./index-….js" no
 - Assets are bundled, never loaded from a CDN: fonts from `@fontsource/*`, three.js from npm.
   YouTube videos are link cards (`createVideoCards`), not embeds.
 - Adding a mockup route means editing `src/server.ts`, `src/mockups/registry.ts` and the cards in
-  `src/index.html` together; `tests/server.test.ts` checks every registry slug is served and that the index shows each entry's name, pitch and tryThis.
+  `src/mockups/index.html` together; `tests/server.test.ts` checks every registry slug is served and that the index shows each entry's name, pitch and tryThis.
 
 ## Workflow
 
diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
index 04c5ead..127f156 100644
--- a/docs/ARCHITECTURE.md
+++ b/docs/ARCHITECTURE.md
@@ -12,7 +12,7 @@ shared credits snippet.
 | Path | Responsibility |
 |---|---|
 | `src/server.ts` | `startServer(port, { contentDir? })`: routes `/`, `/mockups/NN-slug/` (+ 302 from the no-slash form), `/content/*` via `src/content/routes.ts`, 404 otherwise. Runs when `import.meta.main`; `PORT` env, default 3000. |
-| `src/index.html`, `src/index.ts`, `src/index.css` | Index page: static cards linking each mockup, then `mountCredits()`. |
+| `src/mockups/index.html`, `index.ts`, `index.css` | Mockup gallery at `/mockups/`: static cards linking each mockup, then `mountCredits()`. |
 | `src/mockups/registry.ts` | `mockups: MockupInfo[]` — slug, number, name, pitch, what to try. |
 | `src/mockups/NN-slug/` | One design direction: `index.html` (links `../../shared/credits.css`, has `<footer data-fan-credits>`), `main.ts`, `style.css`, plus optional helper modules (e.g. `scene.ts`, `layout.ts`). |
 | `src/data/types.ts` | `Saga`, `Song`, `Part`, `Motif`, `StoryTime`, `OdysseyRef`, `Video`. |
@@ -43,7 +43,7 @@ the site works and `/content/*` answers 404. Otherwise none. Fonts (`@fontsource
 
 ## Invariants
 - Every page renders `FAN_NOTICE` via `mountCredits()`.
-- `src/server.ts` routes, `src/mockups/registry.ts` and the cards in `src/index.html` list the same slugs
+- `src/server.ts` routes, `src/mockups/registry.ts` and the cards in `src/mockups/index.html` list the same slugs
   (`tests/server.test.ts`).
 - Every motif id used by a part exists; every motif appears in at least one song (`tests/data.test.ts`).
 - No two mockups ship byte-identical `style.css` (the build fails otherwise).
diff --git a/src/app/index.html b/src/app/index.html
new file mode 100644
index 0000000..654193d
--- /dev/null
+++ b/src/app/index.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8" />
+  <meta name="viewport" content="width=device-width, initial-scale=1" />
+  <title>EPIC: The Musical Timeline — an unofficial fan voyage</title>
+  <link rel="stylesheet" href="../shared/credits.css" />
+  <link rel="stylesheet" href="./style.css" />
+</head>
+<body>
+  <main id="voyage-app">
+    <section id="stage" aria-label="The voyage"></section>
+    <aside id="panel" aria-label="Song details"></aside>
+    <nav id="timeline" aria-label="Songs and motif threads"></nav>
+  </main>
+  <footer data-fan-credits></footer>
+  <script type="module" src="./main.ts"></script>
+</body>
+</html>
diff --git a/src/app/main.ts b/src/app/main.ts
new file mode 100644
index 0000000..5942cfc
--- /dev/null
+++ b/src/app/main.ts
@@ -0,0 +1,3 @@
+import { mountCredits } from "../shared/credits";
+
+mountCredits();
diff --git a/src/app/style.css b/src/app/style.css
new file mode 100644
index 0000000..2c0e83f
--- /dev/null
+++ b/src/app/style.css
@@ -0,0 +1,2 @@
+/* The voyage app (spec 002). Tokens and layout are filled in by the plan's tasks. */
+body { margin: 0; background: #1d1712; }
diff --git a/src/index.css b/src/mockups/index.css
similarity index 100%
rename from src/index.css
rename to src/mockups/index.css
diff --git a/src/index.html b/src/mockups/index.html
similarity index 99%
rename from src/index.html
rename to src/mockups/index.html
index 299ebcd..d085d90 100644
--- a/src/index.html
+++ b/src/mockups/index.html
@@ -5,7 +5,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1" />
   <title>EPIC: The Musical Timeline — design mockups</title>
   <link rel="stylesheet" href="./index.css" />
-  <link rel="stylesheet" href="./shared/credits.css" />
+  <link rel="stylesheet" href="../shared/credits.css" />
 </head>
 <body>
   <main>
diff --git a/src/index.ts b/src/mockups/index.ts
similarity index 73%
rename from src/index.ts
rename to src/mockups/index.ts
index 265f716..40a5907 100644
--- a/src/index.ts
+++ b/src/mockups/index.ts
@@ -1,4 +1,4 @@
-import { mountCredits } from "./shared/credits";
+import { mountCredits } from "../shared/credits";
 
 // Cards are static in index.html (tests/server.test.ts checks each registry entry's name, pitch and tryThis appear here).
 mountCredits();
diff --git a/src/server.ts b/src/server.ts
index e22d3dd..281d450 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -1,6 +1,7 @@
 import type { Server } from "bun";
 import { contentResponse } from "./content/routes";
-import home from "./index.html";
+import app from "./app/index.html";
+import gallery from "./mockups/index.html";
 import m0 from "./mockups/01-editorial/index.html";
 import m1 from "./mockups/02-vertical-story/index.html";
 import m2 from "./mockups/03-transit-map/index.html";
@@ -29,7 +30,9 @@ export function startServer(port: number, opts: ServerOptions = {}): Server<unde
   return Bun.serve({
     port,
     routes: {
-      "/": home,
+      "/": app,
+      "/mockups/": gallery,
+      "/mockups": Response.redirect("/mockups/", 302),
       "/mockups/01-editorial/": m0,
       "/mockups/01-editorial": Response.redirect("/mockups/01-editorial/", 302),
       "/mockups/02-vertical-story/": m1,
diff --git a/tests/server.test.ts b/tests/server.test.ts
index 842801f..0bc869d 100644
--- a/tests/server.test.ts
+++ b/tests/server.test.ts
@@ -10,15 +10,15 @@ afterAll(() => server.stop(true));
 
 test("registry has 17 mockups", () => expect(mockups).toHaveLength(17));
 
-test("index links every mockup", async () => {
-  const res = await fetch(base + "/");
+test("gallery links every mockup", async () => {
+  const res = await fetch(base + "/mockups/");
   expect(res.status).toBe(200);
   const html = await res.text();
   for (const m of mockups) expect(html).toContain(`/mockups/${m.slug}/`);
 });
 
-test("index shows every registry name, pitch and tryThis", async () => {
-  const html = (await (await fetch(base + "/")).text()).replaceAll("&amp;", "&");
+test("gallery shows every registry name, pitch and tryThis", async () => {
+  const html = (await (await fetch(base + "/mockups/")).text()).replaceAll("&amp;", "&");
   for (const m of mockups) for (const text of [m.name, m.pitch, m.tryThis]) expect(html).toContain(text);
 });
 
@@ -34,3 +34,17 @@ for (const m of mockups) {
     else expect(res.status).toBe(200);
   });
 }
+
+test("the app is served at / with the credits hook", async () => {
+  const res = await fetch(base + "/");
+  expect(res.status).toBe(200);
+  const html = await res.text();
+  expect(html).toContain('id="voyage-app"');
+  expect(html).toContain("data-fan-credits");
+});
+
+test("/mockups redirects to the gallery", async () => {
+  const res = await fetch(base + "/mockups", { redirect: "manual" });
+  expect(res.status).toBe(302);
+  expect(res.headers.get("location")).toContain("/mockups/");
+});