diff --git a/Dockerfile b/Dockerfile
index f012631..02b36cc 100755
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,11 @@
 FROM node:22.14.0-bookworm-slim
 
 WORKDIR /workspace
+
+# The Compose dependency volume is mounted at /workspace/node_modules. Seed it
+# with ownership that matches the non-root user used by the dev container.
+RUN mkdir -p /workspace/node_modules \
+  && chown -R node:node /workspace
+
 USER node
 CMD ["sh", "-c", "npm ci && npm run dev -- --host 0.0.0.0"]
diff --git a/README.md b/README.md
index 58b352c..a8143bf 100755
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # ClassFinder
 
-ClassFinder will help students enter classes and receive campus directions. The repository currently contains the development infrastructure only; production application code, screens, routing logic, and campus data have not been created.
+ClassFinder will help students enter classes and receive campus directions. The repository now contains the initial Vite/React application shell; class-entry behavior, routing logic, and campus data are still being built.
 
 ## Repository map
 
@@ -8,10 +8,11 @@ ClassFinder will help students enter classes and receive campus directions. The
 - `package.json` — npm scripts and development dependencies.
 - `Dockerfile`, `compose.yml`, `.dockerignore` — reproducible Node.js development environment.
 - `scripts/` — infrastructure-only verification.
+- `index.html` — Vite's browser document shell.
+- `src/` — React application source, with `main.tsx` as the entrypoint and `App.tsx` as the root component.
 - `tests/` — future unit, UI, and end-to-end test locations; no product tests exist yet.
 - `.github/workflows/` — pull-request checks and GitHub Pages release deployment.
 - `.agents/skills/` — project-provided agent skills.
-- `src/` — not created yet; application implementation owns this directory.
 
 ## Getting Started
 
@@ -31,7 +32,7 @@ On a host with Node.js 22 LTS installed, run:
 npm ci
 ```
 
-Or start the development environment with Docker after application code provides the Vite entrypoint:
+Or start the development environment with Docker:
 
 ```sh
 docker compose up --build
@@ -56,7 +57,7 @@ npm run test:smoke
 docker compose config
 ```
 
-`npm run build` is intentionally not runnable until the application implementation adds Vite's `index.html` and entrypoint. The test commands currently validate the configured harness and pass with no product tests; application work must add meaningful tests before relying on coverage.
+The test commands currently validate the configured harness and pass with no product tests; application work must add meaningful tests before relying on coverage.
 
 ## GitHub configuration
 
@@ -67,4 +68,12 @@ The release workflow deploys version tags to GitHub Pages. Before its first rele
 - **`docker` is not recognized or the daemon is unavailable:** Start Docker Desktop (or the Docker service) and rerun `docker version`.
 - **Dependency install fails:** Use Node.js 22 LTS and rerun `npm ci`; do not mix npm with another package manager.
 - **Port is already in use:** Stop the process using the future Vite development port or change the Compose port mapping when application development begins.
+- **Docker reports an npm permission error:** Recreate the dependency volume after a prior run created it with root ownership:
+
+  ```sh
+  docker compose down -v
+  docker compose up --build
+  ```
+
+  The `-v` removes only the local `node_modules` volume; dependencies will be installed again from `package-lock.json`.
 - **GitHub Pages deployment fails:** Confirm Pages is enabled for GitHub Actions and that the repository allows the workflow's `pages: write` and `id-token: write` permissions.
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..627e9ea
--- /dev/null
+++ b/index.html
@@ -0,0 +1,16 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <meta
+      name="description"
+      content="ClassFinder helps students find directions between campus classes."
+    />
+    <title>ClassFinder</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>
diff --git a/package-lock.json b/package-lock.json
index 00b8124..9ca0521 100755
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,7 +19,7 @@
         "@types/node": "22.13.10",
         "@types/react": "19.0.10",
         "@types/react-dom": "19.0.4",
-        "@vitest/coverage-v8": "3.2.7",
+        "@vitest/coverage-v8": "^5.0.1",
         "eslint": "9.39.5",
         "eslint-config-prettier": "10.1.1",
         "globals": "16.0.0",
@@ -29,27 +29,13 @@
         "typescript": "5.8.2",
         "typescript-eslint": "8.26.0",
         "vite": "6.4.3",
-        "vitest": "3.2.7"
+        "vitest": "^5.0.1"
       },
       "engines": {
         "node": ">=22.14.0 <23",
         "npm": ">=10"
       }
     },
-    "node_modules/@ampproject/remapping": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/@ampproject/remapping/-/remapping-2.3.0.tgz",
-      "integrity": "sha512-30iZtAPgz+LTIYoeivqYo853f02jBYSd5uGnGpkFV0M3xOt9aN73erkgYAmZU43x4VfqcnLxW9Kpg3R5LC4YYw==",
-      "dev": true,
-      "license": "Apache-2.0",
-      "dependencies": {
-        "@jridgewell/gen-mapping": "^0.3.5",
-        "@jridgewell/trace-mapping": "^0.3.24"
-      },
-      "engines": {
-        "node": ">=6.0.0"
-      }
-    },
     "node_modules/@asamuzakjp/css-color": {
       "version": "5.1.11",
       "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-5.1.11.tgz",
@@ -137,9 +123,9 @@
       }
     },
     "node_modules/@babel/parser": {
-      "version": "7.29.8",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.29.8.tgz",
-      "integrity": "sha512-E8lTAYNB1KW+FH+VGJuZM1ioAx2E6oVlvQFRrf5P8ZZmsiJXYAD9vTFV7yyEURNzgh1dFqMZuO6tUwcARbqFCA==",
+      "version": "7.29.9",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.29.9.tgz",
+      "integrity": "sha512-CjXrNHTnvqBVqHgdBysY3vk2T8tpJHb5/RMeHJBTyVa9xgugCB0CJTx/3oO8RV2QRQP391RWpB7D6hLjm8V9uA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -1022,45 +1008,6 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
-    "node_modules/@isaacs/cliui": {
-      "version": "8.0.2",
-      "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
-      "integrity": "sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==",
-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "string-width": "^5.1.2",
-        "string-width-cjs": "npm:string-width@^4.2.0",
-        "strip-ansi": "^7.0.1",
-        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
-        "wrap-ansi": "^8.1.0",
-        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
-      },
-      "engines": {
-        "node": ">=12"
-      }
-    },
-    "node_modules/@istanbuljs/schema": {
-      "version": "0.1.6",
-      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.6.tgz",
-      "integrity": "sha512-+Sg6GCR/wy1oSmQDFq4LQDAhm3ETKnorxN+y5nbLULOR3P0c14f2Wurzj3/xqPXtasLFfHd5iRFQ7AJt4KH2cw==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=8"
-      }
-    },
-    "node_modules/@jridgewell/gen-mapping": {
-      "version": "0.3.13",
-      "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
-      "integrity": "sha512-2kkt/7niJ6MgEPxF0bYdQ6etZaA+fQvDcLKckhy1yIQOzaoKjBBjSj63/aLVjYE3qhRt5dvM+uUyfCg6UKCBbA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@jridgewell/sourcemap-codec": "^1.5.0",
-        "@jridgewell/trace-mapping": "^0.3.24"
-      }
-    },
     "node_modules/@jridgewell/resolve-uri": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
@@ -1144,17 +1091,6 @@
         "node": ">= 8"
       }
     },
-    "node_modules/@pkgjs/parseargs": {
-      "version": "0.11.0",
-      "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
-      "integrity": "sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==",
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "engines": {
-        "node": ">=14"
-      }
-    },
     "node_modules/@playwright/test": {
       "version": "1.63.0",
       "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.63.0.tgz",
@@ -1845,32 +1781,27 @@
       }
     },
     "node_modules/@vitest/coverage-v8": {
-      "version": "3.2.7",
-      "resolved": "https://registry.npmjs.org/@vitest/coverage-v8/-/coverage-v8-3.2.7.tgz",
-      "integrity": "sha512-NEGWJS2XNu2PfRLQwOO3CTKj1tTETxNBdk454vDxVBhxJYhPaA/eS0nAI0c+1El1P7a60z8+i+ZrQoGESweGKg==",
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/@vitest/coverage-v8/-/coverage-v8-5.0.1.tgz",
+      "integrity": "sha512-FRC8ACiudC3dI6MTplzRSYWHDRnIv2IPfbzs4FdoJNsMal/35sWV8hwIfV8ZcqzSPy+uXHeMVONt9CEqtOU17w==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@ampproject/remapping": "^2.3.0",
         "@bcoe/v8-coverage": "^1.0.2",
-        "ast-v8-to-istanbul": "^0.3.3",
-        "debug": "^4.4.1",
-        "istanbul-lib-coverage": "^3.2.2",
-        "istanbul-lib-report": "^3.0.1",
-        "istanbul-lib-source-maps": "^5.0.6",
-        "istanbul-reports": "^3.1.7",
-        "magic-string": "^0.30.17",
-        "magicast": "^0.3.5",
-        "std-env": "^3.9.0",
-        "test-exclude": "^7.0.1",
-        "tinyrainbow": "^2.0.0"
+        "@vitest/istanbul-lib-coverage": "^1.0.0",
+        "@vitest/istanbul-lib-report": "^1.0.0",
+        "ast-v8-to-istanbul": "^1.0.5",
+        "magicast": "^0.5.4",
+        "obug": "^2.1.4",
+        "std-env": "^4.2.0",
+        "tinyrainbow": "^3.1.1"
       },
       "funding": {
         "url": "https://opencollective.com/vitest"
       },
       "peerDependencies": {
-        "@vitest/browser": "3.2.7",
-        "vitest": "3.2.7"
+        "@vitest/browser": "5.0.1",
+        "vitest": "5.0.1"
       },
       "peerDependenciesMeta": {
         "@vitest/browser": {
@@ -1878,40 +1809,47 @@
         }
       }
     },
-    "node_modules/@vitest/expect": {
-      "version": "3.2.7",
-      "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-3.2.7.tgz",
-      "integrity": "sha512-E8eBXaKibuvH2pSZErOjdVb5vF4PbKYcrnluBTYxEk1l/VhhwZg1kZQsdtjq+CsF5CFydf2Rdkz7jDHKSisi3w==",
+    "node_modules/@vitest/istanbul-lib-coverage": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@vitest/istanbul-lib-coverage/-/istanbul-lib-coverage-1.0.1.tgz",
+      "integrity": "sha512-k3DJZ8LhMBK9NS4SclF1ASD3OgXEWDorbIcPTRDK0/Zae6fRvu+fJRxtFdLfHsa9Y24beCdPnoNZ4LviTNstfA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=22"
+      }
+    },
+    "node_modules/@vitest/istanbul-lib-report": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@vitest/istanbul-lib-report/-/istanbul-lib-report-1.0.1.tgz",
+      "integrity": "sha512-1EOLRfsTMnyAr3+kEAsP4o9dhaDlGPpD7H5iLBBeq//YpNB1VIahkPhB+eRp9N2Dkfw8oySROjE3yf9XDeaIkQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@types/chai": "^5.2.2",
-        "@vitest/spy": "3.2.7",
-        "@vitest/utils": "3.2.7",
-        "chai": "^5.2.0",
-        "tinyrainbow": "^2.0.0"
+        "@vitest/istanbul-lib-coverage": "1.0.1"
       },
-      "funding": {
-        "url": "https://opencollective.com/vitest"
+      "engines": {
+        "node": ">=22"
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     "node_modules/@vitest/mocker": {
-      "version": "3.2.7",
-      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-3.2.7.tgz",
-      "integrity": "sha512-Trr0hYO9CM3Wj6ksWHRhK9IZpIY6wTMO5u/MqXurMxT57sWBaOPEtP3Oq60ihZuh5JsiagKfz95OcxdEP6dBrA==",
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/@vitest/mocker/-/mocker-5.0.1.tgz",
+      "integrity": "sha512-6K1DoBNAPGvuOcSsGA4D6x+5zEEff/KmOOP3uetT2TrGpVfI+HRHRnJJfKi5ib/g1vx8IYHQD8s0pbJz8WQI7Q==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@vitest/spy": "3.2.7",
+        "@jridgewell/trace-mapping": "0.3.31",
+        "@vitest/spy": "5.0.1",
         "estree-walker": "^3.0.3",
-        "magic-string": "^0.30.17"
+        "magic-string": "^1.2.3"
       },
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         "url": "https://opencollective.com/vitest"
       },
       "peerDependencies": {
         "msw": "^2.4.9",
-        "vite": "^5.0.0 || ^6.0.0 || ^7.0.0-0"
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
       },
       "peerDependenciesMeta": {
         "msw": {
@@ -1922,73 +1860,12 @@
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-        "url": "https://opencollective.com/vitest"
-      }
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-    "node_modules/@vitest/runner": {
-      "version": "3.2.7",
-      "resolved": "https://registry.npmjs.org/@vitest/runner/-/runner-3.2.7.tgz",
-      "integrity": "sha512-sB9y4ovltoQP+WaUPwmSxO9WIg9Ig694Di5PalVPsYHklAdE027mehpWF2SQSVq+k6sFgaivbTjTJwZLSHbedA==",
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-      "license": "MIT",
-      "dependencies": {
-        "@vitest/utils": "3.2.7",
-        "pathe": "^2.0.3",
-        "strip-literal": "^3.0.0"
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-      }
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-    "node_modules/@vitest/snapshot": {
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-      }
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-    "node_modules/@vitest/utils": {
-      "version": "3.2.7",
-      "resolved": "https://registry.npmjs.org/@vitest/utils/-/utils-3.2.7.tgz",
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+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/@vitest/spy/-/spy-5.0.1.tgz",
+      "integrity": "sha512-rbto/mF/SGERxEgYOek7Xm6B9b+y+mVoo+f4b2LymYO8zM1b7uB5nHuhVMTP2hxdzgxvGiZYGxGIaMvL5y180Q==",
       "dev": true,
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-      "dependencies": {
-        "@vitest/pretty-format": "3.2.7",
-        "loupe": "^3.1.4",
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         "url": "https://opencollective.com/vitest"
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@@ -2087,9 +1964,9 @@
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-      "resolved": "https://registry.npmjs.org/ast-v8-to-istanbul/-/ast-v8-to-istanbul-0.3.12.tgz",
-      "integrity": "sha512-BRRC8VRZY2R4Z4lFIL35MwNXmwVqBityvOIwETtsCSwvjl0IdgFsy9NhdaA6j74nUdtJJlIypeRhpDam19Wq3g==",
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/ast-v8-to-istanbul/-/ast-v8-to-istanbul-1.0.7.tgz",
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       "dev": true,
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@@ -2146,16 +2023,6 @@
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-      "dev": true,
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@@ -2167,18 +2034,11 @@
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-      "resolved": "https://registry.npmjs.org/chai/-/chai-5.3.3.tgz",
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+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-6.2.2.tgz",
+      "integrity": "sha512-NUPRluOfOiTKBKvWPtSD4PhFvWCqOi0BGStNWs57X9js7XGTprSmFoz5F0tWhR4WPjNeR9jXqdC7/UpSJTnlRg==",
       "dev": true,
       "license": "MIT",
-      "dependencies": {
-        "assertion-error": "^2.0.1",
-        "check-error": "^2.1.1",
-        "deep-eql": "^5.0.1",
-        "loupe": "^3.1.0",
-        "pathval": "^2.0.0"
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       "engines": {
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@@ -2200,16 +2060,6 @@
         "url": "https://github.com/chalk/chalk?sponsor=1"
       }
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-    "node_modules/check-error": {
-      "version": "2.1.3",
-      "resolved": "https://registry.npmjs.org/check-error/-/check-error-2.1.3.tgz",
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@@ -2312,16 +2162,6 @@
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-    },
     "node_modules/xml-name-validator": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
diff --git a/package.json b/package.json
index f65bd19..bfdf4e9 100755
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "@types/node": "22.13.10",
     "@types/react": "19.0.10",
     "@types/react-dom": "19.0.4",
-    "@vitest/coverage-v8": "3.2.7",
+    "@vitest/coverage-v8": "^5.0.1",
     "eslint": "9.39.5",
     "eslint-config-prettier": "10.1.1",
     "globals": "16.0.0",
@@ -42,6 +42,6 @@
     "typescript": "5.8.2",
     "typescript-eslint": "8.26.0",
     "vite": "6.4.3",
-    "vitest": "3.2.7"
+    "vitest": "^5.0.1"
   }
 }
diff --git a/src/App.tsx b/src/App.tsx
new file mode 100644
index 0000000..cf1ddf5
--- /dev/null
+++ b/src/App.tsx
@@ -0,0 +1,27 @@
+function App() {
+  return (
+    <div className="app-shell">
+      <header className="site-header">
+        <a className="brand" href="/" aria-label="ClassFinder home">
+          ClassFinder
+        </a>
+      </header>
+
+      {/* <main className="page-content">
+        <section className="welcome-panel" aria-labelledby="page-title">
+          <p className="eyebrow">Campus directions</p>
+          <h1 id="page-title">Find your way to class.</h1>
+          <p className="intro">
+            Enter your class schedule to get clear directions between campus
+            buildings.
+          </p>
+          <div className="setup-note" role="status">
+            Your ClassFinder workspace is ready for the class-entry experience.
+          </div>
+        </section>
+      </main> */}
+    </div>
+  );
+}
+
+export default App;
diff --git a/src/lib/dijkstras.ts b/src/lib/dijkstras.ts
new file mode 100644
index 0000000..e69de29
diff --git a/src/main.tsx b/src/main.tsx
new file mode 100644
index 0000000..603ee59
--- /dev/null
+++ b/src/main.tsx
@@ -0,0 +1,16 @@
+import { StrictMode } from 'react';
+import { createRoot } from 'react-dom/client';
+import App from './App';
+import './styles.css';
+
+const rootElement = document.getElementById('root');
+
+if (!rootElement) {
+  throw new Error('The application root element is missing.');
+}
+
+createRoot(rootElement).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+);
diff --git a/src/styles.css b/src/styles.css
new file mode 100644
index 0000000..28ace39
--- /dev/null
+++ b/src/styles.css
@@ -0,0 +1,106 @@
+:root {
+  font-family:
+    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
+    "Segoe UI", sans-serif;
+  color: #18302b;
+  background: #f5f8f4;
+  font-synthesis: none;
+  text-rendering: optimizeLegibility;
+}
+
+* {
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+  min-width: 320px;
+  min-height: 100vh;
+}
+
+button,
+a {
+  font: inherit;
+}
+
+.app-shell {
+  min-height: 100vh;
+}
+
+.site-header {
+  display: flex;
+  align-items: center;
+  min-height: 4.5rem;
+  padding: 0 2rem;
+  border-bottom: 1px solid #dce7df;
+  background: #ffffff;
+}
+
+.brand {
+  color: #17624f;
+  font-size: 1.15rem;
+  font-weight: 750;
+  letter-spacing: -0.02em;
+  text-decoration: none;
+}
+
+.page-content {
+  display: grid;
+  min-height: calc(100vh - 4.5rem);
+  place-items: center;
+  padding: 4rem 1.5rem;
+}
+
+.welcome-panel {
+  width: min(100%, 42rem);
+  padding: clamp(2rem, 6vw, 4rem);
+  border: 1px solid #dce7df;
+  border-radius: 1rem;
+  background: #ffffff;
+  box-shadow: 0 1rem 3rem rgb(24 48 43 / 8%);
+}
+
+.eyebrow {
+  margin: 0 0 0.75rem;
+  color: #17624f;
+  font-size: 0.75rem;
+  font-weight: 750;
+  letter-spacing: 0.12em;
+  text-transform: uppercase;
+}
+
+h1 {
+  max-width: 12ch;
+  margin: 0;
+  color: #18302b;
+  font-size: clamp(2.5rem, 8vw, 4.5rem);
+  letter-spacing: -0.06em;
+  line-height: 0.98;
+}
+
+.intro {
+  max-width: 34rem;
+  margin: 1.5rem 0 0;
+  color: #4f6760;
+  font-size: 1.1rem;
+  line-height: 1.6;
+}
+
+.setup-note {
+  margin-top: 2rem;
+  padding: 1rem;
+  border-left: 3px solid #e2a348;
+  background: #fff8eb;
+  color: #5b492c;
+  line-height: 1.5;
+}
+
+@media (max-width: 480px) {
+  .site-header {
+    padding: 0 1.25rem;
+  }
+
+  .page-content {
+    padding: 2rem 1rem;
+  }
+}
diff --git a/src/vite-env.d.ts b/src/vite-env.d.ts
new file mode 100644
index 0000000..11f02fe
--- /dev/null
+++ b/src/vite-env.d.ts
@@ -0,0 +1 @@
+/// <reference types="vite/client" />