diff --git a/manifest.json b/manifest.json
new file mode 100644
index 0000000..2f15717
--- /dev/null
+++ b/manifest.json
@@ -0,0 +1,6 @@
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new file mode 100644
index 0000000..056567f
--- /dev/null
+++ b/package-lock.json
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diff --git a/package.json b/package.json
new file mode 100644
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@@ -0,0 +1,16 @@
+{
+  "name": "obsidian-aera-theme",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "sass --watch --no-source-map --style=expanded --no-error-css src/theme.scss:theme.css",
+    "build": "sass --no-source-map --style=expanded --no-error-css src/theme.scss theme.css",
+    "test": "node --test",
+    "check": "npm run build && node --test && node scripts/check-theme.mjs && node scripts/contrast.mjs"
+  },
+  "devDependencies": {
+    "postcss": "8.5.19",
+    "sass": "1.101.0"
+  }
+}
diff --git a/src/theme.scss b/src/theme.scss
new file mode 100644
index 0000000..80c5505
--- /dev/null
+++ b/src/theme.scss
@@ -0,0 +1 @@
+/* Aera - A quiet interface for clear thinking. */
diff --git a/tests/metadata.test.mjs b/tests/metadata.test.mjs
new file mode 100644
index 0000000..4e74718
--- /dev/null
+++ b/tests/metadata.test.mjs
@@ -0,0 +1,20 @@
+import assert from "node:assert/strict";
+import { readFile } from "node:fs/promises";
+import test from "node:test";
+
+async function readJson(path) {
+  return JSON.parse(await readFile(new URL(path, import.meta.url), "utf8"));
+}
+
+test("theme metadata is consistent", async () => {
+  const manifest = await readJson("../manifest.json");
+  const packageJson = await readJson("../package.json");
+  const versions = await readJson("../versions.json");
+
+  assert.equal(manifest.name, "Aera");
+  assert.equal(manifest.author, "Peter");
+  assert.equal(manifest.minAppVersion, "1.12.7");
+  assert.match(manifest.version, /^\d+\.\d+\.\d+$/);
+  assert.equal(packageJson.version, manifest.version);
+  assert.equal(versions[manifest.version], manifest.minAppVersion);
+});
diff --git a/theme.css b/theme.css
new file mode 100644
index 0000000..80c5505
--- /dev/null
+++ b/theme.css
@@ -0,0 +1 @@
+/* Aera - A quiet interface for clear thinking. */
diff --git a/versions.json b/versions.json
new file mode 100644
index 0000000..83823b4
--- /dev/null
+++ b/versions.json
@@ -0,0 +1,3 @@
+{
+  "0.1.0": "1.12.7"
+}