diff --git a/package.json b/package.json
index 5f56522..ac8e401 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,8 @@
     "dev": "tsx watch src/server.ts",
     "build": "tsc && vite build",
     "start": "node dist/server.js",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsc --noEmit",
+    "test": "npm run build && node --test tests/*.test.mjs"
   },
   "dependencies": {
     "archiver": "^7.0.1",
diff --git a/src/slug.ts b/src/slug.ts
index 6c9446e..05f4b0a 100644
--- a/src/slug.ts
+++ b/src/slug.ts
@@ -5,12 +5,13 @@ export function slugify(input: string, fallback = "chatgpt-share"): string {
     .normalize("NFKD")
     .replace(STOP_CHARS, "")
     .toLowerCase()
-    .replace(/[^a-z0-9]+/g, "-")
+    .replace(/[^\p{L}\p{N}]+/gu, "-")
     .replace(/^-+|-+$/g, "")
-    .replace(/-{2,}/g, "-")
-    .slice(0, 80);
+    .replace(/-{2,}/g, "-");
 
-  return base || fallback;
+  const truncated = Array.from(base).slice(0, 80).join("").replace(/-+$/g, "");
+
+  return truncated || fallback;
 }
 
 export function displayTitleFromSlug(slug: string): string {
diff --git a/tests/slug.test.mjs b/tests/slug.test.mjs
new file mode 100644
index 0000000..1d4566f
--- /dev/null
+++ b/tests/slug.test.mjs
@@ -0,0 +1,23 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { slugify } from "../dist/slug.js";
+
+test("preserves Unicode letters and numbers", () => {
+  assert.equal(slugify("多喝水减肥效果"), "多喝水减肥效果");
+  assert.equal(slugify("减肥 Plan 2026"), "减肥-plan-2026");
+});
+
+test("normalizes punctuation and Latin accents", () => {
+  assert.equal(slugify("  Café — healthy choices!  "), "cafe-healthy-choices");
+});
+
+test("uses the fallback when no letters or numbers remain", () => {
+  assert.equal(slugify("🎉 !!!"), "chatgpt-share");
+  assert.equal(slugify("🎉", "capture"), "capture");
+});
+
+test("limits slugs to 80 Unicode code points without a trailing separator", () => {
+  assert.equal(slugify(`${"界".repeat(79)} hello`), "界".repeat(79));
+  assert.equal(Array.from(slugify("界".repeat(100))).length, 80);
+});