diff --git a/.claude/skills/openjung-api/SKILL.md b/.claude/skills/openjung-api/SKILL.md
index d2f6bc0..51756b3 100644
--- a/.claude/skills/openjung-api/SKILL.md
+++ b/.claude/skills/openjung-api/SKILL.md
@@ -19,17 +19,17 @@ OpenJung is an open-source personality test based on OEJTS (Open Extended Jungia
 
 ```javascript
 // 1. Fetch questions
-const { questions } = await fetch('https://openjung.org/api/questions').then(r => r.json());
+const { questions } = await fetch('https://openjung.org/api/questions').then((r) => r.json());
 
 // 2. Collect user answers (32 questions, values 1-5)
-const answers = { "1": 3, "2": 5, /* ... all 32 */ "32": 4 };
+const answers = { 1: 3, 2: 5, /* ... all 32 */ 32: 4 };
 
 // 3. Calculate result
 const { result } = await fetch('https://openjung.org/api/calculate', {
   method: 'POST',
   headers: { 'Content-Type': 'application/json' },
-  body: JSON.stringify({ answers })
-}).then(r => r.json());
+  body: JSON.stringify({ answers }),
+}).then((r) => r.json());
 
 console.log(result.type); // "ENFP"
 ```
@@ -45,6 +45,7 @@ GET /api/questions?locale=en
 ```
 
 **Response:**
+
 ```json
 {
   "totalQuestions": 32,
@@ -73,6 +74,7 @@ POST /api/calculate
 ```
 
 **Response:**
+
 ```json
 {
   "result": {
@@ -120,6 +122,7 @@ Get aggregate test statistics.
 **Scale**: 1-5 Likert (1 = strongly left trait, 5 = strongly right trait)
 
 **Dimensions** (8 questions each):
+
 - **EI**: Extroversion (E) ↔ Introversion (I)
 - **SN**: Sensing (S) ↔ Intuition (N)
 - **TF**: Thinking (T) ↔ Feeling (F)
@@ -128,6 +131,7 @@ Get aggregate test statistics.
 **Score Range**: 8-40 per dimension (8 questions × 1-5 scale)
 
 **Threshold**: 24 (midpoint)
+
 - Score ≤ 24 → left preference (E, S, F, J)
 - Score > 24 → right preference (I, N, T, P)
 
@@ -135,28 +139,29 @@ Get aggregate test statistics.
 
 ## Question Mapping
 
-| Dimension | Question IDs |
-|-----------|--------------|
-| JP | 1, 5, 9, 13, 17, 21, 25, 29 |
-| TF | 2, 6, 10, 14, 18, 22, 26, 30 |
-| EI | 3, 7, 11, 15, 19, 23, 27, 31 |
-| SN | 4, 8, 12, 16, 20, 24, 28, 32 |
+| Dimension | Question IDs                 |
+| --------- | ---------------------------- |
+| JP        | 1, 5, 9, 13, 17, 21, 25, 29  |
+| TF        | 2, 6, 10, 14, 18, 22, 26, 30 |
+| EI        | 3, 7, 11, 15, 19, 23, 27, 31 |
+| SN        | 4, 8, 12, 16, 20, 24, 28, 32 |
 
 ## Localization
 
 44 languages supported. Pass `locale` parameter to endpoints:
+
 - `en` (English), `zh` (Simplified Chinese), `ja` (Japanese), `ko` (Korean)
 - `es` (Spanish), `fr` (French), `de` (German), `pt` (Portuguese)
 - And 36 more...
 
 ## Error Handling
 
-| Error Code | Description |
-|------------|-------------|
-| `INVALID_BODY` | Malformed JSON |
-| `INVALID_PARAMS` | Missing/wrong answers format |
+| Error Code           | Description                   |
+| -------------------- | ----------------------------- |
+| `INVALID_BODY`       | Malformed JSON                |
+| `INVALID_PARAMS`     | Missing/wrong answers format  |
 | `INCOMPLETE_ANSWERS` | Not all 32 questions answered |
-| `CALCULATION_FAILED` | Server error |
+| `CALCULATION_FAILED` | Server error                  |
 
 ## Resources
 
diff --git a/.claude/skills/openjung-api/references/api_reference.md b/.claude/skills/openjung-api/references/api_reference.md
index da48bbb..7b90a5f 100644
--- a/.claude/skills/openjung-api/references/api_reference.md
+++ b/.claude/skills/openjung-api/references/api_reference.md
@@ -21,23 +21,27 @@ interface TestAnswers {
 
 // Dimension raw scores
 interface DimensionScores {
-  EI: number;  // 8-40
-  SN: number;  // 8-40
-  TF: number;  // 8-40
-  JP: number;  // 8-40
+  EI: number; // 8-40
+  SN: number; // 8-40
+  TF: number; // 8-40
+  JP: number; // 8-40
 }
 
 // Percentage breakdown
 interface DimensionPercentages {
-  E: number; I: number;  // sum to 100
-  S: number; N: number;  // sum to 100
-  T: number; F: number;  // sum to 100
-  J: number; P: number;  // sum to 100
+  E: number;
+  I: number; // sum to 100
+  S: number;
+  N: number; // sum to 100
+  T: number;
+  F: number; // sum to 100
+  J: number;
+  P: number; // sum to 100
 }
 
 // Complete test result
 interface TestResult {
-  type: string;                    // "ENFP", "INTJ", etc.
+  type: string; // "ENFP", "INTJ", etc.
   scores: DimensionScores;
   percentages: DimensionPercentages;
 }
@@ -60,9 +64,9 @@ interface ApiResult extends TestResult {
 interface Question {
   id: number;
   dimension: 'EI' | 'SN' | 'TF' | 'JP';
-  title?: string;        // Optional guidance text
-  leftTrait: string;     // Left option (score 1)
-  rightTrait: string;    // Right option (score 5)
+  title?: string; // Optional guidance text
+  leftTrait: string; // Left option (score 1)
+  rightTrait: string; // Right option (score 5)
 }
 
 // Confidence metrics
@@ -71,8 +75,8 @@ type ConfidenceLevel = 'strong' | 'moderate' | 'slight' | 'balanced';
 interface DimensionConfidence {
   dimension: 'EI' | 'SN' | 'TF' | 'JP';
   level: ConfidenceLevel;
-  distance: number;      // Distance from threshold (24)
-  percentage: number;    // 0-100 confidence
+  distance: number; // Distance from threshold (24)
+  percentage: number; // 0-100 confidence
 }
 ```
 
@@ -85,15 +89,18 @@ interface DimensionConfidence {
 **Purpose**: Retrieve all 32 OEJTS test questions
 
 **Query Parameters:**
-| Parameter | Type | Default | Description |
-|-----------|------|---------|-------------|
-| locale | string | "en" | Language code for localized text |
+
+| Parameter | Type   | Default | Description                      |
+| --------- | ------ | ------- | -------------------------------- |
+| locale    | string | "en"    | Language code for localized text |
 
 **Headers:**
+
 - `Access-Control-Allow-Origin: *` (CORS enabled)
 - `Cache-Control: public, max-age=86400` (24h cache)
 
 **Success Response (200):**
+
 ```json
 {
   "totalQuestions": 32,
@@ -121,6 +128,7 @@ interface DimensionConfidence {
 **Purpose**: Calculate personality type from submitted answers
 
 **Request Body:**
+
 ```typescript
 {
   answers: Record<string, number>;  // Required: all 32 answers
@@ -130,11 +138,13 @@ interface DimensionConfidence {
 ```
 
 **Validation Rules:**
+
 - All 32 questions must be answered
 - Answer values must be integers 1-5
 - Answer keys must be string numbers "1" through "32"
 
 **Success Response (200):**
+
 ```json
 {
   "result": {
@@ -181,6 +191,7 @@ interface DimensionConfidence {
 ```
 
 **Error Response (400):**
+
 ```json
 {
   "error": "INCOMPLETE_ANSWERS",
@@ -196,6 +207,7 @@ interface DimensionConfidence {
 **Purpose**: Record a completed test result (analytics, non-blocking)
 
 **Request Body:**
+
 ```typescript
 {
   answers: Record<string, number>;
@@ -209,6 +221,7 @@ interface DimensionConfidence {
 ```
 
 **Success Response (201):**
+
 ```json
 {
   "success": true,
@@ -223,9 +236,11 @@ interface DimensionConfidence {
 **Purpose**: Retrieve aggregate test statistics
 
 **Headers:**
+
 - `Cache-Control: public, max-age=300` (5min cache)
 
 **Success Response (200):**
+
 ```json
 {
   "totalTests": 15234,
@@ -238,9 +253,7 @@ interface DimensionConfidence {
     { "locale": "en", "count": 8234 },
     { "locale": "zh", "count": 4123 }
   ],
-  "recentTrend": [
-    { "date": "2026-01-01", "count": 234 }
-  ],
+  "recentTrend": [{ "date": "2026-01-01", "count": 234 }],
   "lastUpdated": "2026-01-28T12:34:56Z"
 }
 ```
@@ -257,7 +270,7 @@ const dimensionQuestions = {
   EI: [3, 7, 11, 15, 19, 23, 27, 31],
   SN: [4, 8, 12, 16, 20, 24, 28, 32],
   TF: [2, 6, 10, 14, 18, 22, 26, 30],
-  JP: [1, 5, 9, 13, 17, 21, 25, 29]
+  JP: [1, 5, 9, 13, 17, 21, 25, 29],
 };
 
 function calculateScores(answers: TestAnswers): DimensionScores {
@@ -278,8 +291,8 @@ function determineType(scores: DimensionScores): string {
   return [
     scores.EI <= THRESHOLD ? 'E' : 'I',
     scores.SN <= THRESHOLD ? 'S' : 'N',
-    scores.TF <= THRESHOLD ? 'F' : 'T',  // Note: TF inverted
-    scores.JP <= THRESHOLD ? 'J' : 'P'
+    scores.TF <= THRESHOLD ? 'F' : 'T', // Note: TF inverted
+    scores.JP <= THRESHOLD ? 'J' : 'P',
   ].join('');
 }
 ```
@@ -298,7 +311,7 @@ function calculatePercentages(scores: DimensionScores): DimensionPercentages {
     T: toPercent(scores.TF),
     F: 100 - toPercent(scores.TF),
     P: toPercent(scores.JP),
-    J: 100 - toPercent(scores.JP)
+    J: 100 - toPercent(scores.JP),
   };
 }
 ```
@@ -308,18 +321,21 @@ function calculatePercentages(scores: DimensionScores): DimensionPercentages {
 ## Test Modes
 
 ### Full Test (32 Questions)
+
 - Default mode
 - All 32 OEJTS questions
 - Most accurate results
 - Score range: 8-40 per dimension
 
 ### Quick Test (8 Questions)
+
 - 2 questions per dimension
 - Selected questions: [3, 15, 24, 32, 22, 14, 9, 13]
 - Score range: 2-10 per dimension
 - Threshold: 6
 
 ### Dimension Test (8 Questions)
+
 - Single dimension focus
 - 8 questions for selected dimension only
 - Returns single dimension result
@@ -328,40 +344,40 @@ function calculatePercentages(scores: DimensionScores): DimensionPercentages {
 
 ## All 32 Questions
 
-| ID | Dim | Left Trait | Right Trait |
-|----|-----|------------|-------------|
-| 1 | JP | Makes lists | Relies on memory |
-| 2 | TF | Skeptical | Wants to believe |
-| 3 | EI | Bored by time alone | Needs time alone |
-| 4 | SN | Accepts things as they are | Unsatisfied with the status quo |
-| 5 | JP | Keeps a clean room | Tolerates a messy room |
-| 6 | TF | Thinks "robotic" is an insult | Thinks "robotic" is a compliment |
-| 7 | EI | Energized by interaction | Drained by interaction |
-| 8 | SN | Prefers routine tasks | Prefers new challenges |
-| 9 | JP | Plans social events ahead | Goes with the flow |
-| 10 | TF | Sentimental | Unsentimental |
-| 11 | EI | Comfortable in groups | Uncomfortable in groups |
-| 12 | SN | Focuses on details | Focuses on big picture |
-| 13 | JP | Prepares for meetings | Wings it |
-| 14 | TF | Tenderhearted | Tough-minded |
-| 15 | EI | Initiates conversations | Waits to be approached |
-| 16 | SN | Works with facts | Works with ideas |
-| 17 | JP | Finishes tasks early | Finishes at deadline |
-| 18 | TF | Values harmony | Values truth |
-| 19 | EI | Thinks out loud | Thinks inside head |
-| 20 | SN | Trusts experience | Trusts intuition |
-| 21 | JP | Follows schedules | Follows impulses |
-| 22 | TF | Empathetic | Analytical |
-| 23 | EI | Joins group activities | Prefers one-on-one |
-| 24 | SN | Practical | Theoretical |
-| 25 | JP | Organized workspace | Creative chaos |
-| 26 | TF | Decides with heart | Decides with head |
-| 27 | EI | Outgoing | Reserved |
-| 28 | SN | Concrete | Abstract |
-| 29 | JP | Punctual | Flexible with time |
-| 30 | TF | Personal approach | Impersonal approach |
-| 31 | EI | Party animal | Homebody |
-| 32 | SN | Realistic | Imaginative |
+| ID  | Dim | Left Trait                    | Right Trait                      |
+| --- | --- | ----------------------------- | -------------------------------- |
+| 1   | JP  | Makes lists                   | Relies on memory                 |
+| 2   | TF  | Skeptical                     | Wants to believe                 |
+| 3   | EI  | Bored by time alone           | Needs time alone                 |
+| 4   | SN  | Accepts things as they are    | Unsatisfied with the status quo  |
+| 5   | JP  | Keeps a clean room            | Tolerates a messy room           |
+| 6   | TF  | Thinks "robotic" is an insult | Thinks "robotic" is a compliment |
+| 7   | EI  | Energized by interaction      | Drained by interaction           |
+| 8   | SN  | Prefers routine tasks         | Prefers new challenges           |
+| 9   | JP  | Plans social events ahead     | Goes with the flow               |
+| 10  | TF  | Sentimental                   | Unsentimental                    |
+| 11  | EI  | Comfortable in groups         | Uncomfortable in groups          |
+| 12  | SN  | Focuses on details            | Focuses on big picture           |
+| 13  | JP  | Prepares for meetings         | Wings it                         |
+| 14  | TF  | Tenderhearted                 | Tough-minded                     |
+| 15  | EI  | Initiates conversations       | Waits to be approached           |
+| 16  | SN  | Works with facts              | Works with ideas                 |
+| 17  | JP  | Finishes tasks early          | Finishes at deadline             |
+| 18  | TF  | Values harmony                | Values truth                     |
+| 19  | EI  | Thinks out loud               | Thinks inside head               |
+| 20  | SN  | Trusts experience             | Trusts intuition                 |
+| 21  | JP  | Follows schedules             | Follows impulses                 |
+| 22  | TF  | Empathetic                    | Analytical                       |
+| 23  | EI  | Joins group activities        | Prefers one-on-one               |
+| 24  | SN  | Practical                     | Theoretical                      |
+| 25  | JP  | Organized workspace           | Creative chaos                   |
+| 26  | TF  | Decides with heart            | Decides with head                |
+| 27  | EI  | Outgoing                      | Reserved                         |
+| 28  | SN  | Concrete                      | Abstract                         |
+| 29  | JP  | Punctual                      | Flexible with time               |
+| 30  | TF  | Personal approach             | Impersonal approach              |
+| 31  | EI  | Party animal                  | Homebody                         |
+| 32  | SN  | Realistic                     | Imaginative                      |
 
 ---
 
@@ -379,19 +395,19 @@ function PersonalityTest() {
 
   useEffect(() => {
     fetch('https://openjung.org/api/questions')
-      .then(r => r.json())
-      .then(data => setQuestions(data.questions));
+      .then((r) => r.json())
+      .then((data) => setQuestions(data.questions));
   }, []);
 
   const handleAnswer = (questionId, value) => {
-    setAnswers(prev => ({ ...prev, [questionId]: value }));
+    setAnswers((prev) => ({ ...prev, [questionId]: value }));
   };
 
   const submit = async () => {
     const response = await fetch('https://openjung.org/api/calculate', {
       method: 'POST',
       headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify({ answers })
+      body: JSON.stringify({ answers }),
     });
     const data = await response.json();
     setResult(data.result);
@@ -403,10 +419,12 @@ function PersonalityTest() {
 
   return (
     <div>
-      {questions.map(q => (
+      {questions.map((q) => (
         <div key={q.id}>
-          <p>{q.leftTrait} ← → {q.rightTrait}</p>
-          {[1, 2, 3, 4, 5].map(v => (
+          <p>
+            {q.leftTrait} ← → {q.rightTrait}
+          </p>
+          {[1, 2, 3, 4, 5].map((v) => (
             <button
               key={v}
               onClick={() => handleAnswer(q.id, v)}
@@ -467,27 +485,27 @@ curl "https://openjung.org/api/stats"
 
 ## Supported Locales
 
-| Code | Language | Code | Language |
-|------|----------|------|----------|
-| en | English | ko | Korean |
-| zh | Simplified Chinese | es | Spanish |
-| zh-tw | Traditional Chinese | fr | French |
-| ja | Japanese | de | German |
-| pt | Portuguese | ru | Russian |
-| hi | Hindi | bn | Bengali |
-| fil | Filipino | uk | Ukrainian |
-| sw | Swahili | cs | Czech |
-| ro | Romanian | hu | Hungarian |
-| sk | Slovak | el | Greek |
-| sv | Swedish | no | Norwegian |
-| da | Danish | fi | Finnish |
-| ms | Malay | km | Khmer |
-| lo | Lao | si | Sinhala |
-| ta | Tamil | am | Amharic |
-| ha | Hausa | yo | Yoruba |
-| zu | Zulu | ig | Igbo |
-| ar | Arabic | he | Hebrew |
-| th | Thai | vi | Vietnamese |
-| id | Indonesian | tr | Turkish |
-| pl | Polish | nl | Dutch |
-| it | Italian | ... | 44+ total |
+| Code  | Language            | Code | Language   |
+| ----- | ------------------- | ---- | ---------- |
+| en    | English             | ko   | Korean     |
+| zh    | Simplified Chinese  | es   | Spanish    |
+| zh-tw | Traditional Chinese | fr   | French     |
+| ja    | Japanese            | de   | German     |
+| pt    | Portuguese          | ru   | Russian    |
+| hi    | Hindi               | bn   | Bengali    |
+| fil   | Filipino            | uk   | Ukrainian  |
+| sw    | Swahili             | cs   | Czech      |
+| ro    | Romanian            | hu   | Hungarian  |
+| sk    | Slovak              | el   | Greek      |
+| sv    | Swedish             | no   | Norwegian  |
+| da    | Danish              | fi   | Finnish    |
+| ms    | Malay               | km   | Khmer      |
+| lo    | Lao                 | si   | Sinhala    |
+| ta    | Tamil               | am   | Amharic    |
+| ha    | Hausa               | yo   | Yoruba     |
+| zu    | Zulu                | ig   | Igbo       |
+| ar    | Arabic              | he   | Hebrew     |
+| th    | Thai                | vi   | Vietnamese |
+| id    | Indonesian          | tr   | Turkish    |
+| pl    | Polish              | nl   | Dutch      |
+| it    | Italian             | ...  | 44+ total  |
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..8c52ff9
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,12 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
diff --git a/.github/ISSUE_TEMPLATE/bug_report.yml b/.github/ISSUE_TEMPLATE/bug_report.yml
new file mode 100644
index 0000000..ac20c08
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/bug_report.yml
@@ -0,0 +1,31 @@
+name: Bug report
+description: A function returns the wrong result, a type is wrong, or the package fails to load.
+labels: [bug]
+body:
+  - type: textarea
+    id: what
+    attributes:
+      label: What happened?
+      description: What did you call, what did you get, and what did you expect?
+      placeholder: |
+        generateResult({ ... }) returned type "ENFP" but the EI score was 24, which should be E.
+    validations:
+      required: true
+  - type: textarea
+    id: repro
+    attributes:
+      label: Minimal reproduction
+      description: A snippet we can paste into a test. Please include the answers object.
+      render: ts
+  - type: input
+    id: version
+    attributes:
+      label: Package version
+      placeholder: '@openjung/core@1.0.1, or a commit SHA'
+    validations:
+      required: true
+  - type: input
+    id: runtime
+    attributes:
+      label: Runtime
+      placeholder: Node 24 / Vite 7 / Cloudflare Workers / React Native
diff --git a/.github/ISSUE_TEMPLATE/config.yml b/.github/ISSUE_TEMPLATE/config.yml
new file mode 100644
index 0000000..b646e3c
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/config.yml
@@ -0,0 +1,8 @@
+blank_issues_enabled: true
+contact_links:
+  - name: openjung.org website
+    url: https://openjung.org
+    about: Try the test, or report a problem with the site itself.
+  - name: OEJTS source instrument
+    url: https://openpsychometrics.org/tests/OEJTS/
+    about: The original Open Extended Jungian Type Scales by Open Psychometrics.
diff --git a/.github/ISSUE_TEMPLATE/translation_correction.yml b/.github/ISSUE_TEMPLATE/translation_correction.yml
new file mode 100644
index 0000000..1707b9f
--- /dev/null
+++ b/.github/ISSUE_TEMPLATE/translation_correction.yml
@@ -0,0 +1,61 @@
+name: Translation correction
+description: Propose better wording for a question in one locale. Please do not include your own answers or results.
+labels: [translation]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you. 39 of the 44 locales are AI-assisted drafts that have not had native-speaker review,
+        so corrections are very welcome. See TRANSLATIONS.md for the known review priorities.
+        Changing the **direction** of a pair (which side scores 1 and which scores 5) is a scoring change,
+        not a translation fix; please open a bug report for that instead.
+  - type: input
+    id: locale
+    attributes:
+      label: Locale
+      description: The locale code as used in the package, e.g. `de`, `pt-br`, `zh-tw`.
+    validations:
+      required: true
+  - type: input
+    id: question
+    attributes:
+      label: Question ID
+      description: 1–32 for the OEJTS questions, or "PurrJung 1–16" for the cat test.
+    validations:
+      required: true
+  - type: dropdown
+    id: field
+    attributes:
+      label: Field
+      options:
+        - title
+        - leftTrait
+        - rightTrait
+    validations:
+      required: true
+  - type: textarea
+    id: current
+    attributes:
+      label: Current wording
+    validations:
+      required: true
+  - type: textarea
+    id: proposed
+    attributes:
+      label: Proposed wording
+    validations:
+      required: true
+  - type: textarea
+    id: reason
+    attributes:
+      label: Why is the new wording better?
+      description: Register, idiom, ambiguity, cultural fit, gendered address, reading level, etc.
+    validations:
+      required: true
+  - type: checkboxes
+    id: speaker
+    attributes:
+      label: Your relationship to this language
+      options:
+        - label: I am a native or fluent speaker of this locale.
+        - label: I compared the proposal against the English source text.
diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
new file mode 100644
index 0000000..be5b2ee
--- /dev/null
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -0,0 +1,16 @@
+## What
+
+<!-- One or two sentences on what changes and why. -->
+
+## Contracts
+
+<!-- Delete the lines that do not apply. -->
+
+- [ ] Question IDs, dimension membership and left/right direction are unchanged
+- [ ] Every name in `src/index.test.ts` still exports (or this is a breaking change and the title says so)
+- [ ] Added or changed locale strings keep the `[title, leftTrait, rightTrait]` order
+- [ ] `npm run check` passes locally
+
+## Notes for review
+
+<!-- Anything the reviewer should look at first, or that you were unsure about. -->
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..55b1148
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,14 @@
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      dev-dependencies:
+        dependency-type: development
+        update-types: [minor, patch]
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..8f0829a
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,56 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  check:
+    name: Node ${{ matrix.node }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node: [20, 22, 24]
+    steps:
+      - uses: actions/checkout@v5
+
+      - uses: actions/setup-node@v5
+        with:
+          node-version: ${{ matrix.node }}
+          cache: npm
+
+      - run: npm ci
+
+      - name: Typecheck
+        run: npm run typecheck
+
+      - name: Format
+        run: npm run format:check
+
+      - name: Test
+        run: npm test
+
+      - name: Build
+        run: npm run build
+
+      - name: Smoke-test the built package under Node ESM
+        run: |
+          node --input-type=module -e "
+            const api = await import('@openjung/core');
+            const answers = Object.fromEntries(Array.from({ length: 32 }, (_, i) => [i + 1, 3]));
+            const result = api.generateResult(answers);
+            if (result.type !== 'ESFJ') throw new Error('unexpected neutral type ' + result.type);
+            console.log('ok:', Object.keys(api).length, 'exports,', api.SUPPORTED_LOCALES.length, 'locales');
+          "
+
+      - name: Lint package exports
+        run: npm run check:package
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 3ce5ba7..3122e72 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -1,49 +1,43 @@
 name: Publish to npm
 
+# Publishes the version in package.json when a GitHub release is published.
+# The release tag must match the package version (v1.2.3 ↔ "version": "1.2.3").
+# Bump the version with `npm version <patch|minor|major>` before tagging; see CONTRIBUTING.md.
+
 on:
   release:
-    types: [created]
+    types: [published]
   workflow_dispatch:
-    inputs:
-      version:
-        description: 'Version bump type (patch, minor, major) or specific version'
-        required: false
-        default: 'patch'
+
+permissions:
+  contents: read
+  id-token: write
 
 jobs:
   publish:
     runs-on: ubuntu-latest
-    permissions:
-      contents: write
-      id-token: write
     steps:
-      - name: Checkout
-        uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
         with:
-          node-version: '20'
-          registry-url: 'https://registry.npmjs.org'
-
-      - name: Install dependencies
-        run: npm ci
+          node-version: 24
+          cache: npm
+          registry-url: https://registry.npmjs.org
 
-      - name: Run tests
-        run: npm test
+      - run: npm ci
 
-      - name: Build
-        run: npm run build
-
-      - name: Bump version (manual trigger only)
-        if: github.event_name == 'workflow_dispatch'
+      - name: Check that the release tag matches package.json
+        if: github.event_name == 'release'
         run: |
-          git config user.name "github-actions[bot]"
-          git config user.email "github-actions[bot]@users.noreply.github.com"
-          npm version ${{ github.event.inputs.version }} -m "Release v%s"
-          git push --follow-tags
-
-      - name: Publish to npm
-        run: npm publish --access public --provenance
+          expected="v$(node -p "require('./package.json').version")"
+          if [ "${{ github.event.release.tag_name }}" != "$expected" ]; then
+            echo "Release tag ${{ github.event.release.tag_name }} does not match package version $expected"
+            exit 1
+          fi
+
+      # prepublishOnly runs clean, typecheck, format check, tests, build and publint.
+      - name: Publish
+        run: npm publish
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
diff --git a/.gitignore b/.gitignore
index dd6e803..788ce30 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,19 @@
+# Dependencies
 node_modules/
+
+# Build output
 dist/
+coverage/
+*.tgz
+
+# Logs
 *.log
+npm-debug.log*
+
+# OS / editor
 .DS_Store
+.idea/
+.vscode/
+
+# Local-only tool state
+.claude/settings.local.json
diff --git a/.node-version b/.node-version
new file mode 100644
index 0000000..a45fd52
--- /dev/null
+++ b/.node-version
@@ -0,0 +1 @@
+24
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..6aa19a0
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,5 @@
+dist/
+coverage/
+node_modules/
+package-lock.json
+CHANGELOG.md
diff --git a/.prettierrc b/.prettierrc
new file mode 100644
index 0000000..789ac2e
--- /dev/null
+++ b/.prettierrc
@@ -0,0 +1,5 @@
+{
+  "printWidth": 100,
+  "singleQuote": true,
+  "trailingComma": "es5"
+}
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..75fb624
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,54 @@
+# Changelog
+
+All notable changes to this package are documented here. The format follows
+[Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and the project uses
+[Semantic Versioning](https://semver.org/).
+
+## [Unreleased]
+
+Nothing under the `@openjung/core` name has been published yet. The last release
+on npm is `@openmbti/core@1.0.1`; everything below is new since then.
+
+### Changed
+
+- **Package renamed** from `@openmbti/core` to `@openjung/core`. Import paths change; the API does not.
+- Build targets Node ESM (`module: NodeNext`); relative imports now carry `.js` extensions so `dist/` loads in Node without a bundler.
+- `quickTestQuestionIds` is typed as `DimensionQuestions` (readonly arrays keyed by dimension) instead of `Record<string, number[]>`.
+- `BilingualText` is now an alias of the new `MultilingualText` interface and is deprecated.
+- Scoring for the full, quick, single-dimension and PurrJung tests shares one internal engine. Results are byte-for-byte identical.
+
+### Added
+
+- Quick test mode: 8 questions, 2 per dimension, with its own scoring functions.
+- Single-dimension tests: `generateDimensionResult` and friends, plus range constants.
+- Quality metrics: per-dimension confidence, profile clarity index, answer-consistency checks, confidence labels.
+- PurrJung cat temperament test: 16 questions in five locales with matching scoring functions.
+- Question titles (`title`) on all 32 questions.
+- 39 additional locales on every OEJTS question (44 in total). AI-assisted drafts; see TRANSLATIONS.md.
+- `SUPPORTED_LOCALES`, `PURRJUNG_LOCALES`, `DEFAULT_LOCALE`, `Locale` and `getLocalizedText()`.
+- Test suite covering scoring contracts, data integrity, locales, PurrJung and the public export list.
+- CI on Node 20/22/24 with typecheck, Prettier, tests, build, a Node ESM import smoke test, `publint` and `@arethetypeswrong/cli`.
+- `LICENSE` (MIT, code) and `LICENSE-DATA` (CC BY-NC-SA 4.0, questionnaire content).
+- `CONTRIBUTING.md`, issue templates (bug, translation correction), PR template, Dependabot.
+
+### Fixed
+
+- Test files are no longer compiled into `dist/` or shipped in the npm tarball.
+- `package.json` `exports` lists `types` first so TypeScript resolves declarations under every module setting.
+
+## [1.0.1] - 2025-12-16
+
+Published as `@openmbti/core`.
+
+### Added
+
+- OEJTS 1.2 question bank (32 bipolar pairs) in `en`, `zh`, `ja`, `ko`, `zh-tw`.
+- Scoring: dimension sums, type determination, pole percentages, completeness check.
+- GitHub Actions workflow for npm publishing.
+
+### Fixed
+
+- TF dimension Q2 scoring direction (Skeptical / Wants to believe) now matches the OEJTS loading.
+
+[Unreleased]: https://github.com/openjung/core/compare/main...HEAD
+[1.0.1]: https://github.com/openjung/core/commits/main
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..763df11
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,58 @@
+# Contributing
+
+Thanks for helping. This package is small and deliberately boring: data, pure functions, no dependencies. Keep it that way.
+
+## Setup
+
+```bash
+git clone https://github.com/openjung/core.git
+cd core
+npm ci
+npm run check   # typecheck + format + tests + build + package lint
+```
+
+Node 20, 22 and 24 are tested in CI. `.node-version` pins 24 for local tooling.
+
+| Script                  | What it does                                                   |
+| ----------------------- | -------------------------------------------------------------- |
+| `npm test`              | Run the Vitest suite once                                      |
+| `npm run test:watch`    | Re-run tests on change                                         |
+| `npm run typecheck`     | `tsc --noEmit` over sources and tests                          |
+| `npm run format`        | Prettier, in place                                             |
+| `npm run build`         | Emit `dist/` (ESM + declarations) from `tsconfig.build.json`   |
+| `npm run check:package` | `publint` and `@arethetypeswrong/cli` against a packed tarball |
+| `npm run check`         | Everything CI runs                                             |
+
+## What must not change silently
+
+These are relied on by openjung.org, its mobile app and stored user results. Changing any of them is a breaking change and needs a major version bump and a changelog entry.
+
+- **Question IDs and dimension membership.** `dimensionQuestions`, `quickTestQuestionIds` and `purrjungDimensionQuestions` are stable.
+- **Answer direction.** 1 = left trait, 5 = right trait. Low scores resolve to E, S, F, J on the human test and to E, S, T, J on PurrJung.
+- **Score ranges and thresholds.** 8–40 with midpoint 24 (full and single-dimension), 2–10 with midpoint 6 (quick), 4–20 with midpoint 12 (PurrJung). A score exactly on the midpoint resolves to the left pole.
+- **Exported names.** `src/index.test.ts` pins the runtime export list. Add names freely; never remove or rename without a major bump.
+- **Translation tuple order.** `questionTranslations[locale][id]` is `[title, leftTrait, rightTrait]`.
+
+## Translations
+
+Wording fixes for any locale are welcome; use the _Translation correction_ issue template or open a PR that edits `src/questionTranslations.ts` (or `src/questions.ts` for `en`, `zh`, `ja`, `ko`, `zh-tw`). Keep the scoring direction. If you believe a pair is reversed, that is a scoring bug, not a translation fix, and needs its own issue.
+
+Please record who reviewed what in `TRANSLATIONS.md` when a locale gets a native-speaker pass.
+
+## Pull requests
+
+- Keep PRs focused. Data, scoring and tooling changes are easier to review apart.
+- Add or update tests next to the code (`src/*.test.ts`).
+- Run `npm run check` before pushing; CI runs the same steps.
+- Fill in the PR template's contract checklist.
+
+## Releasing
+
+Releases are published to npm by GitHub Actions when a GitHub release is published.
+
+1. Update `CHANGELOG.md`: move entries from _Unreleased_ under the new version and date.
+2. Bump the version: `npm version patch` (or `minor` / `major`). This commits and tags `vX.Y.Z`.
+3. Push with tags: `git push --follow-tags`.
+4. Create a GitHub release from the tag. The publish workflow checks that the tag matches `package.json`, runs the full check, and publishes with provenance.
+
+The workflow uses the `NPM_TOKEN` repository secret (an npm granular token with publish rights on `@openjung`). Once the package exists on npm, consider switching to npm trusted publishing and dropping the token.
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..22e5387
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 ya-luotao and OpenJung contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/LICENSE-DATA b/LICENSE-DATA
new file mode 100644
index 0000000..55e3503
--- /dev/null
+++ b/LICENSE-DATA
@@ -0,0 +1,26 @@
+Questionnaire content license
+=============================
+
+This repository contains two kinds of material under two licenses.
+
+1. Code (everything that is not questionnaire text) is licensed under the MIT
+   License in the LICENSE file.
+
+2. The OEJTS questionnaire items and every adaptation of them, including the
+   English prompts, the left/right trait wording, the quick-test subset and all
+   44 locales in src/questions.ts and src/questionTranslations.ts, are derived
+   from the Open Extended Jungian Type Scales 1.2 by Eric Jorgenson /
+   Open Psychometrics and are licensed under
+
+       Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
+       https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+   Source: https://openpsychometrics.org/tests/OJTS/development/OEJTS1.2.pdf
+
+   The MIT license on the code does not override the attribution,
+   noncommercial and share-alike terms that apply to this content. If you ship
+   the questions, keep the attribution and these terms. See TRANSLATIONS.md
+   for provenance and the review status of each locale.
+
+The PurrJung cat questions in src/purrjungQuestions.ts are original OpenJung
+content and are not derived from the OEJTS text.
diff --git a/README.md b/README.md
index 114056d..d13ddb7 100644
--- a/README.md
+++ b/README.md
@@ -1,116 +1,190 @@
 # @openjung/core
 
-Core OEJTS (Open Extended Jungian Type Scales) MBTI personality test questions and scoring logic.
+[![CI](https://github.com/openjung/core/actions/workflows/ci.yml/badge.svg)](https://github.com/openjung/core/actions/workflows/ci.yml)
+[![License: MIT](https://img.shields.io/badge/code-MIT-blue.svg)](LICENSE)
+[![Questions: CC BY-NC-SA 4.0](https://img.shields.io/badge/questions-CC%20BY--NC--SA%204.0-lightgrey.svg)](LICENSE-DATA)
+[![Locales](https://img.shields.io/badge/locales-44-green.svg)](TRANSLATIONS.md)
 
-Based on the [Open Extended Jungian Type Scales 1.2](https://openpsychometrics.org/tests/OEJTS/) by [Open Psychometrics](https://openpsychometrics.org/).
+Questions, scoring and translations for the **Open Extended Jungian Type Scales** (OEJTS), the open-source personality test behind [openjung.org](https://openjung.org). Pure TypeScript, zero dependencies, ESM.
 
-## Installation
+- **32-question OEJTS 1.2** with the 8-question quick mode and per-dimension mini tests
+- **Scoring** that is deterministic and documented: raw scores, four-letter type, pole percentages
+- **Quality metrics**: confidence per dimension, profile clarity, answer-consistency flags
+- **44 locales** on every question (5 original, 39 AI-assisted drafts; see [TRANSLATIONS.md](TRANSLATIONS.md))
+- **PurrJung**, a 16-question companion test for cats, sharing the same result shape
+
+Based on the [OEJTS 1.2](https://openpsychometrics.org/tests/OEJTS/) by Eric Jorgenson / [Open Psychometrics](https://openpsychometrics.org/).
+
+## Install
 
 ```bash
 npm install @openjung/core
 ```
 
-## Usage
+Requires Node 20+ or any bundler that understands ESM. The package ships `dist/` with declarations and source maps, plus `src/` for readers.
 
-```typescript
-import {
-  questions,
-  sortedQuestions,
-  generateResult,
-  isTestComplete,
-  type TestAnswers,
-  type TestResult,
-} from '@openjung/core';
+## Quick start
 
-// Get all questions sorted by ID
-console.log(sortedQuestions.length); // 32
+```ts
+import { sortedQuestions, generateResult, isTestComplete, type TestAnswers } from '@openjung/core';
 
-// Record user answers (questionId -> score 1-5)
-const answers: TestAnswers = {
-  1: 4,  // Question 1, leaning right
-  2: 2,  // Question 2, leaning left
-  // ... all 32 questions
-};
+// Present `sortedQuestions` (32 bipolar pairs, ordered by ID) and collect 1–5 answers:
+//   1 = strongly the left trait, 3 = neutral, 5 = strongly the right trait
+const answers: TestAnswers = { 1: 4, 2: 2 /* …all 32 question IDs */ };
 
-// Check if test is complete
 if (isTestComplete(answers)) {
-  // Generate result
-  const result: TestResult = generateResult(answers);
+  const result = generateResult(answers);
+  result.type; //        "ENFP"
+  result.scores; //      { EI: 18, SN: 30, TF: 20, JP: 32 }   raw, 8–40 each
+  result.percentages; // { E: 69, I: 31, S: 31, N: 69, T: 38, F: 62, J: 25, P: 75 }
+}
+```
 
-  console.log(result.type);        // e.g., "ENFP"
-  console.log(result.scores);      // { EI: 28, SN: 30, TF: 18, JP: 32 }
-  console.log(result.percentages); // { E: 38, I: 62, S: 31, N: 69, ... }
+Every question looks like this. Locale keys beyond `en` are present on all 44 supported locales:
+
+```ts
+{
+  id: 1,
+  dimension: 'JP',
+  title:      { en: 'How do you track tasks?', zh: '你如何记录任务？', de: 'Wie behältst du deine Aufgaben im Blick?', /* … */ },
+  leftTrait:  { en: 'Makes lists',             zh: '制定清单',          de: 'Ich mache Listen',                        /* … */ },
+  rightTrait: { en: 'Relies on memory',        zh: '依靠记忆',          de: 'Ich verlasse mich auf mein Gedächtnis', /* … */ },
 }
 ```
 
+## Scoring model
+
+| Test             | Questions | Per dimension | Score range | Midpoint | Low score →    | High score →   |
+| ---------------- | --------- | ------------- | ----------- | -------- | -------------- | -------------- |
+| Full             | 32        | 8             | 8–40        | 24       | E, S, F, J     | I, N, T, P     |
+| Quick            | 8         | 2             | 2–10        | 6        | E, S, F, J     | I, N, T, P     |
+| Single dimension | 8         | 8             | 8–40        | 24       | E / S / F / J  | I / N / T / P  |
+| PurrJung (cats)  | 16        | 4             | 4–20        | 12       | E, S, **T**, J | I, N, **F**, P |
+
+- Scores are plain sums of the 1–5 answers. Unanswered questions count as neutral (3).
+- A score **above** the midpoint resolves to the high-score pole; a score exactly on the midpoint resolves to the low-score pole.
+- Percentages map the score range linearly onto 0–100 for the high-score pole; the opposite pole is the remainder. Each pair sums to 100.
+- Note that TF runs **F → T** on the human tests (left traits are Feeling) and **T → F** on PurrJung.
+
 ## API
 
-### Data Exports
+Everything is exported from the package root. Types are listed at the end.
 
-- `questions` - Array of all 32 question pairs
-- `sortedQuestions` - Questions sorted by ID (for test presentation)
-- `dimensionQuestions` - Question IDs grouped by dimension
-- `TOTAL_QUESTIONS` - Total number of questions (32)
-- `QUESTIONS_PER_DIMENSION` - Questions per dimension (8)
+### Question bank
 
-### Functions
+| Export                     | Description                                                          |
+| -------------------------- | -------------------------------------------------------------------- |
+| `questions`                | All 32 `QuestionPair`s, grouped by dimension                         |
+| `sortedQuestions`          | The same questions ordered by ID, for presentation                   |
+| `dimensionQuestions`       | `{ EI, SN, TF, JP }` → question IDs                                  |
+| `TOTAL_QUESTIONS`          | `32`                                                                 |
+| `QUESTIONS_PER_DIMENSION`  | `8`                                                                  |
+| `quickTestQuestionIds`     | `{ EI, SN, TF, JP }` → the two most discriminating IDs per dimension |
+| `quickTestQuestions`       | Those 8 IDs, sorted                                                  |
+| `QUICK_TEST_TOTAL`         | `8`                                                                  |
+| `QUICK_TEST_PER_DIMENSION` | `2`                                                                  |
 
-- `generateResult(answers)` - Generate complete test result from answers
-- `calculateScores(answers)` - Calculate raw dimension scores
-- `determineType(scores)` - Determine MBTI type from scores
-- `calculatePercentages(scores)` - Calculate percentage preferences
-- `isTestComplete(answers)` - Check if all questions are answered
+### Full test
 
-### Types
+| Function                          | Returns                                                                   |
+| --------------------------------- | ------------------------------------------------------------------------- |
+| `generateResult(answers)`         | `TestResult` with `type`, `scores`, `percentages`                         |
+| `calculateScores(answers)`        | `DimensionScores`, 8–40 each                                              |
+| `determineType(scores)`           | Four-letter type string                                                   |
+| `calculatePercentages(scores)`    | `DimensionPercentages`, one entry per pole                                |
+| `isTestComplete(answers, total?)` | `true` when exactly `total` (default 32) answers exist. Count check only. |
 
-- `TestAnswers` - Map of question ID to answer (1-5)
-- `TestResult` - Complete result with type, scores, and percentages
-- `DimensionScores` - Raw scores for EI, SN, TF, JP dimensions
-- `DimensionPercentages` - Percentage for each trait pole
-- `QuestionPair` - Question with bipolar traits
-- `BilingualText` - Multilingual text (`en` required, other locale keys optional)
-- `Dimension` - Dimension type ('EI' | 'SN' | 'TF' | 'JP')
+### Quick test
 
-## Question Format
+`generateQuickResult`, `calculateQuickScores`, `determineQuickType`, `calculateQuickPercentages` and `isQuickTestComplete` mirror the full-test functions over the 8 quick-test questions.
 
-The question bank has 44 complete locales. The 39 added locales are AI-assisted drafts, not documented human-reviewed or validated language versions. See [the translation record](TRANSLATIONS.md) for sources, licensing, unchanged contracts and native-speaker review priorities.
+### Single dimension
 
-Each question is a bipolar trait pair:
+Score one dimension on its own, for a focused mini test:
 
-```typescript
-{
-  id: 1,
-  dimension: 'JP',
-  leftTrait: { en: 'Makes lists', zh: '制定清单' },
-  rightTrait: { en: 'Relies on memory', zh: '依靠记忆' }
+```ts
+import {
+  generateDimensionResult,
+  isDimensionTestComplete,
+  getDimensionQuestionIds,
+} from '@openjung/core';
+
+getDimensionQuestionIds('EI'); // [3, 7, 11, 15, 19, 23, 27, 31]
+
+if (isDimensionTestComplete(answers, 'EI')) {
+  generateDimensionResult(answers, 'EI');
+  // { dimension: 'EI', score: 18, preference: 'E', leftPercent: 69, rightPercent: 31 }
 }
 ```
 
-Users answer on a 1-5 scale:
-- 1 = Strongly agree with left trait
-- 3 = Neutral
-- 5 = Strongly agree with right trait
+Also exported: `calculateDimensionScore`, `determineDimensionPreference`, `calculateDimensionPercentages`, and the constants `DIMENSION_QUESTIONS_COUNT` (8), `DIMENSION_SCORE_MIN` (8), `DIMENSION_SCORE_MAX` (40), `DIMENSION_THRESHOLD` (24).
+
+### Quality metrics
+
+How clear and how internally consistent a result is:
+
+```ts
+import { calculateTestConfidence, checkTestConsistency, getConfidenceLabel } from '@openjung/core';
+
+const confidence = calculateTestConfidence(result.scores);
+confidence.EI; //          { dimension: 'EI', level: 'moderate', distance: 6, percentage: 38 }
+confidence.clarityIndex; // 0–100, how far the whole profile sits from the midpoints
+
+getConfidenceLabel(confidence.EI.level, 'E'); // "Moderate E preference"
+
+const consistency = checkTestConsistency(answers);
+consistency.overallConsistent; // false when adjacent answers in a dimension diverge by 3+
+consistency.warnings; //        ["Inconsistent answers in SN dimension"]
+```
+
+Levels: `strong` (distance ≥ 12 from the midpoint), `moderate` (≥ 6), `slight` (≥ 2), `balanced`. Per-dimension variants: `calculateDimensionConfidence`, `checkDimensionConsistency`, `getConfidenceLevel`.
 
-## Scoring
+### Locales
 
-- Each dimension has 8 questions
-- Raw scores range from 8 (all 1s) to 40 (all 5s)
-- Threshold of 24 determines type preference
-- Percentages normalized from 0-100%
+```ts
+import { SUPPORTED_LOCALES, getLocalizedText, type Locale } from '@openjung/core';
 
-## Claude Code Skill
+SUPPORTED_LOCALES; // ['en', 'zh', 'ja', 'ko', 'zh-tw', 'ms', 'de', 'fr', …] (44)
+getLocalizedText(question.leftTrait, 'de'); // falls back to `en` for unknown locales
+```
+
+`PURRJUNG_LOCALES` lists the five locales available on the cat test. `DEFAULT_LOCALE` is `'en'`.
+
+The 39 locales added in September 2026 are AI-assisted drafts without native-speaker review. [TRANSLATIONS.md](TRANSLATIONS.md) records their provenance and the phrases most in need of review; corrections are welcome through the _Translation correction_ issue template.
 
-Install the OpenJung API skill for Claude Code to get AI-assisted integration guidance:
+### PurrJung
+
+A 16-question cat temperament test on the same four axes (Social/Solitary, Routine/Novelty, Independent/Bonded, Structured/Spontaneous):
+
+```ts
+import { sortedPurrjungQuestions, generatePurrjungResult } from '@openjung/core';
+
+generatePurrjungResult(catAnswers); // { type: 'ISFP', scores: { EI: 16, … }, percentages: { … } }
+```
+
+Also exported: `purrjungQuestions`, `purrjungDimensionQuestions`, `PURRJUNG_TOTAL_QUESTIONS` (16), `PURRJUNG_QUESTIONS_PER_DIMENSION` (4), `PURRJUNG_SCORE_MIN` (4), `PURRJUNG_SCORE_MAX` (20), `PURRJUNG_THRESHOLD` (12), `calculatePurrjungScores`, `determinePurrjungType`, `calculatePurrjungPercentages`, `isPurrjungTestComplete`, `getPurrjungDimensionQuestionIds`.
+
+### Types
+
+`TestAnswers`, `Dimension`, `DimensionScores`, `DimensionPercentages`, `TestResult`, `SingleDimensionResult`, `QuestionPair`, `MultilingualText` (alias `BilingualText`, deprecated), `DimensionQuestions`, `Locale`, `ConfidenceLevel`, `DimensionConfidence`, `TestConfidence`, `ConsistencyResult`, `TestConsistency`.
+
+## Claude Code skill
+
+The repository ships a skill that teaches Claude Code the openjung.org HTTP API and this package's scoring model:
 
 ```bash
 npx skills add https://github.com/openjung/core --skill openjung-api
 ```
 
-This skill provides:
-- Complete API endpoint documentation
-- Scoring system explanation
-- TypeScript types and integration examples
+## Development
+
+```bash
+npm ci
+npm run check   # typecheck, format check, tests, build, package lint
+```
+
+See [CONTRIBUTING.md](CONTRIBUTING.md) for the contracts that must not change silently, and for the release process.
 
 ## License
 
-Original code: MIT. OEJTS questionnaire items and adaptations, including translations and subsets: [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/), by Eric Jorgenson / Open Psychometrics. See [the translation record](TRANSLATIONS.md) and [original questionnaire](https://openpsychometrics.org/tests/OJTS/development/OEJTS1.2.pdf).
+Code is [MIT](LICENSE). The OEJTS questionnaire items and all adaptations of them, including the 44 locales and the quick subset, are [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/) by Eric Jorgenson / Open Psychometrics; see [LICENSE-DATA](LICENSE-DATA) and the [original questionnaire](https://openpsychometrics.org/tests/OJTS/development/OEJTS1.2.pdf).
diff --git a/TRANSLATIONS.md b/TRANSLATIONS.md
index 0ef9a2f..e449b82 100644
--- a/TRANSLATIONS.md
+++ b/TRANSLATIONS.md
@@ -24,22 +24,22 @@ The questionnaire items and their adaptations, including these translations, are
 
 Every added locale needs independent bilingual review and respondent comprehension testing. The following are concrete priorities, **not a certification of the other phrases**. Check the titles together with both endpoints; review intensity, negation and social desirability without changing the scoring direction.
 
-| Locale(s) | Questions / issue to resolve |
-| --- | --- |
-| All 39 | Q6 robot/mechanical-mind metaphor, Q10 emotional hurt rather than physical pain or shamelessness, Q18 helping people versus repairing objects, Q22 heart versus reason, Q24 overall picture versus details, Q29 vigorous leisure versus hard work. |
+| Locale(s)               | Questions / issue to resolve                                                                                                                                                                                                                                                   |
+| ----------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
+| All 39                  | Q6 robot/mechanical-mind metaphor, Q10 emotional hurt rather than physical pain or shamelessness, Q18 helping people versus repairing objects, Q22 heart versus reason, Q24 overall picture versus details, Q29 vigorous leisure versus hard work.                             |
 | `ms`, `id`, `fil`, `sw` | Q17 commitment versus keeping alternatives open; Q25 improvisation versus preparedness. For `fil`, check conversational loanwords and the register of “dumidiskarte.” For `sw`, check that “Usio na mpangilio” in Q9 captures a chaotic lifestyle without suggesting violence. |
-| `my` | Q6 “စက်ကဲ့သို့” and Q28 “သီအိုရီများ”: understandable non-specialist terms? Check mixed conversational titles and formal answer endings, and Q10 negation. |
-| `km` | Q6 “តក្កវិជ្ជា” and Q28 “ទ្រឹស្តី” reading level; Q17 strength of commitment; Q30 discomfort with emotions rather than a general bad mood. |
-| `lo` | Q6 machine metaphor, Q25 spontaneous problem-solving without implying superior skill, Q26 compassion versus justice, Q28 theory terminology. Check word boundaries in narrow layouts. |
-| `si` | Q6 robot/machine metaphor, Q24 “සමස්ත චිත්‍රය” as an overall understanding rather than a literal picture, Q28 theory terminology, and consistent self-report register. |
-| `ta` | Q6 logical thinking versus a mechanical mind; Q8 school-exam terminology; Q25 improvisation without implying better ability; Q29 vigorous enjoyment without restricting it to celebrations. Check usage across Indian and Sri Lankan Tamil. |
-| `am` | Q7 energy without implying physical strength; Q17 commitment phrasing; Q26 “ርኅራኄ” / “ፍትሕ”; Q28 “ንድፈ ሐሳብ”; Q30 discomfort, not absence of feelings. Check polite address and orthography. |
-| `ha` | Q6 “mutum-mutumin inji” and Q28 “ra’ayoyin ka’ida” may need more familiar equivalents. Check generic masculine address, Q26 morality versus good behavior and Q31 performance versus demonstration. |
-| `yo` | Verify tone marks and vowel underdots throughout. Check Q6 machine/robot wording, Q10 emotional hurt, Q26 compassion versus justice, Q28 “àbá ìmọ̀” for theory rather than a mere guess, and Q31 performance rather than play alone. |
-| `zu` | Check noun agreement and register throughout; Q16 fitting in rather than conformity, Q26 compassion/justice, Q28 empirical/theoretical vocabulary and Q31 performing versus playing. |
-| `ig` | Check standard-Igbo spelling/dialect and diacritics; Q3 boredom versus tiredness, Q15 parties versus eating/drinking alone, Q17 leaving options open, Q28 theory versus explanation, Q31 performance. |
-| `ar`, `he`, `hi` | Review gendered address and whether an inclusive alternative preserves concise self-report wording. Arabic uses Modern Standard Arabic; Hebrew uses modern Hebrew. Check Q6 quoted metaphors and punctuation in RTL. |
-| European locales | Check informal/formal address consistency, exam/essay terminology in Q8, idiomatic “thick-skinned” in Q10, and Q29 intensity without moral judgment. Norwegian is Bokmål (`no`); Portuguese is Brazilian (`pt-br`). |
+| `my`                    | Q6 “စက်ကဲ့သို့” and Q28 “သီအိုရီများ”: understandable non-specialist terms? Check mixed conversational titles and formal answer endings, and Q10 negation.                                                                                                                     |
+| `km`                    | Q6 “តក្កវិជ្ជា” and Q28 “ទ្រឹស្តី” reading level; Q17 strength of commitment; Q30 discomfort with emotions rather than a general bad mood.                                                                                                                                     |
+| `lo`                    | Q6 machine metaphor, Q25 spontaneous problem-solving without implying superior skill, Q26 compassion versus justice, Q28 theory terminology. Check word boundaries in narrow layouts.                                                                                          |
+| `si`                    | Q6 robot/machine metaphor, Q24 “සමස්ත චිත්‍රය” as an overall understanding rather than a literal picture, Q28 theory terminology, and consistent self-report register.                                                                                                         |
+| `ta`                    | Q6 logical thinking versus a mechanical mind; Q8 school-exam terminology; Q25 improvisation without implying better ability; Q29 vigorous enjoyment without restricting it to celebrations. Check usage across Indian and Sri Lankan Tamil.                                    |
+| `am`                    | Q7 energy without implying physical strength; Q17 commitment phrasing; Q26 “ርኅራኄ” / “ፍትሕ”; Q28 “ንድፈ ሐሳብ”; Q30 discomfort, not absence of feelings. Check polite address and orthography.                                                                                       |
+| `ha`                    | Q6 “mutum-mutumin inji” and Q28 “ra’ayoyin ka’ida” may need more familiar equivalents. Check generic masculine address, Q26 morality versus good behavior and Q31 performance versus demonstration.                                                                            |
+| `yo`                    | Verify tone marks and vowel underdots throughout. Check Q6 machine/robot wording, Q10 emotional hurt, Q26 compassion versus justice, Q28 “àbá ìmọ̀” for theory rather than a mere guess, and Q31 performance rather than play alone.                                            |
+| `zu`                    | Check noun agreement and register throughout; Q16 fitting in rather than conformity, Q26 compassion/justice, Q28 empirical/theoretical vocabulary and Q31 performing versus playing.                                                                                           |
+| `ig`                    | Check standard-Igbo spelling/dialect and diacritics; Q3 boredom versus tiredness, Q15 parties versus eating/drinking alone, Q17 leaving options open, Q28 theory versus explanation, Q31 performance.                                                                          |
+| `ar`, `he`, `hi`        | Review gendered address and whether an inclusive alternative preserves concise self-report wording. Arabic uses Modern Standard Arabic; Hebrew uses modern Hebrew. Check Q6 quoted metaphors and punctuation in RTL.                                                           |
+| European locales        | Check informal/formal address consistency, exam/essay terminology in Q8, idiomatic “thick-skinned” in Q10, and Q29 intensity without moral judgment. Norwegian is Bokmål (`no`); Portuguese is Brazilian (`pt-br`).                                                            |
 
 Software tests check all fields directly (not via a fallback), exact original text/metadata preservation, and independently specified ID/dimension/answer-direction contracts. They cannot establish semantic equivalence. Host applications must also supply local scale labels and descriptions and test their own RTL rendering and keyboard behavior. OpenJung's existing “always / often / depends on situation” descriptions are application copy, not the PDF's “half and half” midpoint; this change does not redefine them.
 
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index c53e319..fbfafac 100644
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@@ -9,150 +9,145 @@
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       "dev": true,
       "license": "MIT",
-      "optional": true,
-      "os": [
-        "freebsd"
-      ],
+      "dependencies": {
+        "tinyexec": "^1.3.0"
+      },
       "engines": {
         "node": ">=18"
+      },
+      "funding": {
+        "url": "https://bjornlu.com/sponsor"
       }
     },
-    "node_modules/@esbuild/linux-arm": {
-      "version": "0.27.1",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm/-/linux-arm-0.27.1.tgz",
-      "integrity": "sha512-ieMID0JRZY/ZeCrsFQ3Y3NlHNCqIhTprJfDgSB3/lv5jJZ8FX3hqPyXWhe+gvS5ARMBJ242PM+VNz/ctNj//eA==",
+    "node_modules/@rolldown/binding-android-arm-eabi": {
+      "version": "1.2.13",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm-eabi/-/binding-android-arm-eabi-1.2.13.tgz",
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       "cpu": [
         "arm"
       ],
@@ -160,16 +155,16 @@
       "license": "MIT",
       "optional": true,
       "os": [
-        "linux"
+        "android"
       ],
       "engines": {
-        "node": ">=18"
+        "node": "^20.19.0 || >=22.12.0"
       }
     },
-    "node_modules/@esbuild/linux-arm64": {
-      "version": "0.27.1",
-      "resolved": "https://registry.npmjs.org/@esbuild/linux-arm64/-/linux-arm64-0.27.1.tgz",
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+    "node_modules/@rolldown/binding-android-arm64": {
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       "cpu": [
         "arm64"
       ],
@@ -177,69 +172,69 @@
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       "optional": true,
       "os": [
-        "linux"
+        "android"
       ],
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-        "node": ">=18"
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+    "node_modules/@rolldown/binding-darwin-arm64": {
+      "version": "1.2.13",
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       "cpu": [
-        "ia32"
+        "arm64"
       ],
       "dev": true,
       "license": "MIT",
       "optional": true,
       "os": [
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+        "darwin"
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+        "@vitest/expect": "4.1.11",
+        "@vitest/mocker": "4.1.11",
+        "@vitest/pretty-format": "4.1.11",
+        "@vitest/runner": "4.1.11",
+        "@vitest/snapshot": "4.1.11",
+        "@vitest/spy": "4.1.11",
+        "@vitest/utils": "4.1.11",
+        "es-module-lexer": "^2.0.0",
+        "expect-type": "^1.3.0",
         "magic-string": "^0.30.21",
         "obug": "^2.1.1",
         "pathe": "^2.0.3",
         "picomatch": "^4.0.3",
-        "std-env": "^3.10.0",
+        "std-env": "^4.0.0-rc.1",
         "tinybench": "^2.9.0",
         "tinyexec": "^1.0.2",
         "tinyglobby": "^0.2.15",
-        "tinyrainbow": "^3.0.3",
-        "vite": "^6.0.0 || ^7.0.0",
+        "tinyrainbow": "^3.1.0",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
         "why-is-node-running": "^2.3.0"
       },
       "bin": {
@@ -1378,12 +1866,15 @@
         "@edge-runtime/vm": "*",
         "@opentelemetry/api": "^1.9.0",
         "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
-        "@vitest/browser-playwright": "4.0.16",
-        "@vitest/browser-preview": "4.0.16",
-        "@vitest/browser-webdriverio": "4.0.16",
-        "@vitest/ui": "4.0.16",
+        "@vitest/browser-playwright": "4.1.11",
+        "@vitest/browser-preview": "4.1.11",
+        "@vitest/browser-webdriverio": "4.1.11",
+        "@vitest/coverage-istanbul": "4.1.11",
+        "@vitest/coverage-v8": "4.1.11",
+        "@vitest/ui": "4.1.11",
         "happy-dom": "*",
-        "jsdom": "*"
+        "jsdom": "*",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
       },
       "peerDependenciesMeta": {
         "@edge-runtime/vm": {
@@ -1404,6 +1895,12 @@
         "@vitest/browser-webdriverio": {
           "optional": true
         },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
         "@vitest/ui": {
           "optional": true
         },
@@ -1412,6 +1909,9 @@
         },
         "jsdom": {
           "optional": true
+        },
+        "vite": {
+          "optional": false
         }
       }
     },
@@ -1431,6 +1931,63 @@
       "engines": {
         "node": ">=8"
       }
+    },
+    "node_modules/wrap-ansi": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
+    "node_modules/y18n": {
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/yargs": {
+      "version": "16.2.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-16.2.2.tgz",
+      "integrity": "sha512-Nt9ZJjXTv5R8MHbqby/wXQ6Gi0Bb3TcYZkR1bzuL4yB2OxWPkXknz513gEF0GoA6tn00UpbPvERW8rzCuWCA6w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cliui": "^7.0.2",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "require-directory": "^2.1.1",
+        "string-width": "^4.2.0",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^20.2.2"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "20.2.9",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-20.2.9.tgz",
+      "integrity": "sha512-y11nGElTIV+CT3Zv9t7VKl+Q3hTQoT9a1Qzezhhl6Rp21gJ/IVTW7Z3y9EWXhuUBC2Shnf+DX0antecpAwSP8w==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=10"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index c4e5e01..8ef44a1 100644
--- a/package.json
+++ b/package.json
@@ -1,39 +1,56 @@
 {
   "name": "@openjung/core",
   "version": "1.0.1",
-  "description": "Core OEJTS (Open Extended Jungian Type Scales) MBTI personality test questions and scoring logic",
+  "description": "Questions, scoring and i18n for the Open Extended Jungian Type Scales (OEJTS) personality test. Zero dependencies, TypeScript, 44 locales.",
   "type": "module",
   "main": "./dist/index.js",
   "module": "./dist/index.js",
   "types": "./dist/index.d.ts",
   "exports": {
     ".": {
+      "types": "./dist/index.d.ts",
       "import": "./dist/index.js",
-      "types": "./dist/index.d.ts"
-    }
+      "default": "./dist/index.js"
+    },
+    "./package.json": "./package.json"
   },
+  "sideEffects": false,
   "files": [
     "dist",
     "src",
-    "TRANSLATIONS.md"
+    "!src/**/*.test.ts",
+    "TRANSLATIONS.md",
+    "LICENSE-DATA"
   ],
+  "engines": {
+    "node": ">=20"
+  },
   "scripts": {
-    "build": "tsc",
-    "dev": "tsc --watch",
+    "build": "tsc -p tsconfig.build.json",
+    "clean": "rm -rf dist",
+    "dev": "tsc -p tsconfig.build.json --watch",
+    "typecheck": "tsc --noEmit",
+    "format": "prettier --write .",
+    "format:check": "prettier --check .",
     "test": "vitest run",
     "test:watch": "vitest",
     "test:coverage": "vitest run --coverage",
-    "prepublishOnly": "npm run build"
+    "check:package": "publint && attw --pack . --profile esm-only",
+    "check": "npm run typecheck && npm run format:check && npm test && npm run build && npm run check:package",
+    "prepublishOnly": "npm run clean && npm run check"
   },
   "keywords": [
     "mbti",
     "oejts",
     "openjung",
     "personality",
+    "personality-test",
     "psychology",
-    "test",
+    "psychometrics",
     "jung",
-    "jungian"
+    "jungian",
+    "i18n",
+    "typescript"
   ],
   "author": "ya-luotao <luotao@hey.com>",
   "license": "MIT",
@@ -45,8 +62,16 @@
     "url": "https://github.com/openjung/core/issues"
   },
   "homepage": "https://openjung.org",
+  "publishConfig": {
+    "access": "public",
+    "provenance": true
+  },
   "devDependencies": {
-    "typescript": "^5.7.0",
+    "@arethetypeswrong/cli": "^0.18.2",
+    "@types/node": "^24.0.0",
+    "prettier": "^3.6.0",
+    "publint": "^0.3.12",
+    "typescript": "^5.9.0",
     "vitest": "^4.0.16"
   }
 }
diff --git a/src/index.test.ts b/src/index.test.ts
new file mode 100644
index 0000000..3511aba
--- /dev/null
+++ b/src/index.test.ts
@@ -0,0 +1,83 @@
+import { describe, it, expect } from 'vitest';
+import * as api from './index.js';
+
+/**
+ * Public API contract. Every name here is re-exported by downstream apps
+ * (openjung.org re-exports most of them verbatim), so removing or renaming one
+ * is a breaking change. Add new names freely; remove only with a major bump.
+ */
+const PUBLIC_EXPORTS = [
+  // Question bank
+  'questions',
+  'sortedQuestions',
+  'dimensionQuestions',
+  'TOTAL_QUESTIONS',
+  'QUESTIONS_PER_DIMENSION',
+  // Quick test
+  'quickTestQuestionIds',
+  'quickTestQuestions',
+  'QUICK_TEST_TOTAL',
+  'QUICK_TEST_PER_DIMENSION',
+  // Full test scoring
+  'calculateScores',
+  'determineType',
+  'calculatePercentages',
+  'generateResult',
+  'isTestComplete',
+  // Quick test scoring
+  'calculateQuickScores',
+  'determineQuickType',
+  'calculateQuickPercentages',
+  'generateQuickResult',
+  'isQuickTestComplete',
+  // Single dimension
+  'DIMENSION_QUESTIONS_COUNT',
+  'DIMENSION_SCORE_MIN',
+  'DIMENSION_SCORE_MAX',
+  'DIMENSION_THRESHOLD',
+  'calculateDimensionScore',
+  'determineDimensionPreference',
+  'calculateDimensionPercentages',
+  'generateDimensionResult',
+  'isDimensionTestComplete',
+  'getDimensionQuestionIds',
+  // Quality metrics
+  'getConfidenceLevel',
+  'calculateDimensionConfidence',
+  'calculateTestConfidence',
+  'checkDimensionConsistency',
+  'checkTestConsistency',
+  'getConfidenceLabel',
+  // Locales
+  'SUPPORTED_LOCALES',
+  'PURRJUNG_LOCALES',
+  'DEFAULT_LOCALE',
+  'getLocalizedText',
+  // PurrJung
+  'purrjungQuestions',
+  'purrjungDimensionQuestions',
+  'sortedPurrjungQuestions',
+  'PURRJUNG_TOTAL_QUESTIONS',
+  'PURRJUNG_QUESTIONS_PER_DIMENSION',
+  'PURRJUNG_SCORE_MIN',
+  'PURRJUNG_SCORE_MAX',
+  'PURRJUNG_THRESHOLD',
+  'calculatePurrjungScores',
+  'determinePurrjungType',
+  'calculatePurrjungPercentages',
+  'generatePurrjungResult',
+  'isPurrjungTestComplete',
+  'getPurrjungDimensionQuestionIds',
+].sort();
+
+describe('public API surface', () => {
+  it('exports exactly the documented runtime names', () => {
+    expect(Object.keys(api).sort()).toEqual(PUBLIC_EXPORTS);
+  });
+
+  it('exports no undefined values', () => {
+    for (const name of PUBLIC_EXPORTS) {
+      expect(api[name as keyof typeof api], name).toBeDefined();
+    }
+  });
+});
diff --git a/src/index.ts b/src/index.ts
index 1531ea4..a752b4a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -9,13 +9,14 @@ export type {
   BilingualText,
   QuestionPair,
   DimensionQuestions,
+  MultilingualText,
   // Test Quality Metrics types
   ConfidenceLevel,
   DimensionConfidence,
   TestConfidence,
   ConsistencyResult,
   TestConsistency,
-} from './types';
+} from './types.js';
 
 // Questions data
 export {
@@ -29,7 +30,7 @@ export {
   quickTestQuestions,
   QUICK_TEST_TOTAL,
   QUICK_TEST_PER_DIMENSION,
-} from './questions';
+} from './questions.js';
 
 // Scoring functions
 export {
@@ -62,7 +63,16 @@ export {
   checkDimensionConsistency,
   checkTestConsistency,
   getConfidenceLabel,
-} from './scoring';
+} from './scoring.js';
+
+// Locales
+export type { Locale } from './locales.js';
+export {
+  SUPPORTED_LOCALES,
+  PURRJUNG_LOCALES,
+  DEFAULT_LOCALE,
+  getLocalizedText,
+} from './locales.js';
 
 // PurrJung Cat Test - Questions data
 export {
@@ -71,7 +81,7 @@ export {
   sortedPurrjungQuestions,
   PURRJUNG_TOTAL_QUESTIONS,
   PURRJUNG_QUESTIONS_PER_DIMENSION,
-} from './purrjungQuestions';
+} from './purrjungQuestions.js';
 
 // PurrJung Cat Test - Scoring functions
 export {
@@ -84,4 +94,4 @@ export {
   generatePurrjungResult,
   isPurrjungTestComplete,
   getPurrjungDimensionQuestionIds,
-} from './purrjungScoring';
+} from './purrjungScoring.js';
diff --git a/src/locales.test.ts b/src/locales.test.ts
new file mode 100644
index 0000000..c530732
--- /dev/null
+++ b/src/locales.test.ts
@@ -0,0 +1,70 @@
+import { describe, it, expect } from 'vitest';
+import {
+  SUPPORTED_LOCALES,
+  PURRJUNG_LOCALES,
+  DEFAULT_LOCALE,
+  getLocalizedText,
+} from './locales.js';
+import { questions } from './questions.js';
+import { purrjungQuestions } from './purrjungQuestions.js';
+import { questionTranslations } from './questionTranslations.js';
+
+describe('SUPPORTED_LOCALES', () => {
+  it('lists 44 unique locales starting with the five reviewed ones', () => {
+    expect(SUPPORTED_LOCALES).toHaveLength(44);
+    expect(new Set(SUPPORTED_LOCALES).size).toBe(44);
+    expect(SUPPORTED_LOCALES.slice(0, 5)).toEqual(['en', 'zh', 'ja', 'ko', 'zh-tw']);
+  });
+
+  it('matches the locales in the translation table', () => {
+    const added = SUPPORTED_LOCALES.slice(5);
+    expect([...added].sort()).toEqual(Object.keys(questionTranslations).sort());
+  });
+
+  it('is present on every field of every OEJTS question', () => {
+    for (const question of questions) {
+      for (const locale of SUPPORTED_LOCALES) {
+        expect(question.title?.[locale], `q${question.id} title ${locale}`).toBeTruthy();
+        expect(question.leftTrait[locale], `q${question.id} left ${locale}`).toBeTruthy();
+        expect(question.rightTrait[locale], `q${question.id} right ${locale}`).toBeTruthy();
+      }
+    }
+  });
+
+  it('starts with the default locale', () => {
+    expect(SUPPORTED_LOCALES[0]).toBe(DEFAULT_LOCALE);
+    expect(DEFAULT_LOCALE).toBe('en');
+  });
+});
+
+describe('PURRJUNG_LOCALES', () => {
+  it('is present on every field of every PurrJung question', () => {
+    expect(PURRJUNG_LOCALES).toEqual(['en', 'zh', 'ja', 'ko', 'zh-tw']);
+    for (const question of purrjungQuestions) {
+      for (const locale of PURRJUNG_LOCALES) {
+        expect(question.title?.[locale], `q${question.id} title ${locale}`).toBeTruthy();
+        expect(question.leftTrait[locale], `q${question.id} left ${locale}`).toBeTruthy();
+        expect(question.rightTrait[locale], `q${question.id} right ${locale}`).toBeTruthy();
+      }
+    }
+  });
+});
+
+describe('getLocalizedText', () => {
+  const text = { en: 'Makes lists', de: 'Macht Listen' };
+
+  it('returns the requested locale when present', () => {
+    expect(getLocalizedText(text, 'de')).toBe('Macht Listen');
+  });
+
+  it('falls back to English for a missing locale', () => {
+    expect(getLocalizedText(text, 'fr')).toBe('Makes lists');
+  });
+
+  it('returns the real translation for every question and locale, never the fallback', () => {
+    const q1 = questions.find((q) => q.id === 1)!;
+    for (const locale of SUPPORTED_LOCALES) {
+      expect(getLocalizedText(q1.leftTrait, locale)).toBe(q1.leftTrait[locale]);
+    }
+  });
+});
diff --git a/src/locales.ts b/src/locales.ts
new file mode 100644
index 0000000..32baf10
--- /dev/null
+++ b/src/locales.ts
@@ -0,0 +1,73 @@
+import type { MultilingualText } from './types.js';
+
+/**
+ * Locales shipped with the OEJTS question bank (`questions`), in the order they were added.
+ *
+ * The first five have shipped since 1.0. The remaining 39 are AI-assisted drafts awaiting
+ * native-speaker review; see TRANSLATIONS.md for provenance and caveats.
+ */
+export const SUPPORTED_LOCALES = [
+  'en',
+  'zh',
+  'ja',
+  'ko',
+  'zh-tw',
+  'ms',
+  'de',
+  'fr',
+  'es',
+  'ar',
+  'he',
+  'ru',
+  'pt-br',
+  'id',
+  'vi',
+  'th',
+  'tr',
+  'it',
+  'pl',
+  'nl',
+  'hi',
+  'bn',
+  'fil',
+  'uk',
+  'sw',
+  'cs',
+  'ro',
+  'hu',
+  'sk',
+  'el',
+  'sv',
+  'no',
+  'da',
+  'fi',
+  'my',
+  'km',
+  'lo',
+  'si',
+  'ta',
+  'am',
+  'ha',
+  'yo',
+  'zu',
+  'ig',
+] as const;
+
+/** A locale code present in every OEJTS question. */
+export type Locale = (typeof SUPPORTED_LOCALES)[number];
+
+/** Locales shipped with the PurrJung cat test (`purrjungQuestions`). */
+export const PURRJUNG_LOCALES = ['en', 'zh', 'ja', 'ko', 'zh-tw'] as const;
+
+/** The locale every text object is guaranteed to contain. */
+export const DEFAULT_LOCALE = 'en' as const;
+
+/**
+ * Read a localized string, falling back to English when the locale is missing.
+ *
+ * @param text - A multilingual text object such as a question's `title` or `leftTrait`
+ * @param locale - The locale to read, e.g. `'de'` or `'zh-tw'`
+ */
+export function getLocalizedText(text: MultilingualText, locale: string): string {
+  return text[locale] ?? text[DEFAULT_LOCALE];
+}
diff --git a/src/purrjungQuestions.ts b/src/purrjungQuestions.ts
index f615a42..58d5335 100644
--- a/src/purrjungQuestions.ts
+++ b/src/purrjungQuestions.ts
@@ -1,4 +1,4 @@
-import type { QuestionPair, DimensionQuestions } from './types';
+import type { QuestionPair, DimensionQuestions } from './types.js';
 
 /**
  * PurrJung Cat Personality Test - 16 Questions
@@ -196,7 +196,7 @@ export const purrjungQuestions: QuestionPair[] = [
     id: 8,
     dimension: 'SN',
     title: {
-      en: 'Your cat\'s preferred resting spots are...',
+      en: "Your cat's preferred resting spots are...",
       zh: '你的猫喜欢的休息地点是...',
       ja: 'あなたの猫の好みの休憩場所は...',
       ko: '당신의 고양이가 선호하는 휴식 장소는...',
@@ -273,7 +273,7 @@ export const purrjungQuestions: QuestionPair[] = [
     id: 11,
     dimension: 'TF',
     title: {
-      en: 'Your cat\'s response to verbal praise or encouragement is...',
+      en: "Your cat's response to verbal praise or encouragement is...",
       zh: '你的猫对言语表扬或鼓励的反应是...',
       ja: '言葉による称賛や励ましに対するあなたの猫の反応は...',
       ko: '칭찬이나 격려에 대한 당신의 고양이의 반응은...',
@@ -298,7 +298,7 @@ export const purrjungQuestions: QuestionPair[] = [
     id: 12,
     dimension: 'TF',
     title: {
-      en: 'When you call your cat\'s name, it typically...',
+      en: "When you call your cat's name, it typically...",
       zh: '当你叫你的猫的名字时，它通常...',
       ja: '猫の名前を呼ぶと、通常...',
       ko: '고양이 이름을 부르면, 보통...',
@@ -325,7 +325,7 @@ export const purrjungQuestions: QuestionPair[] = [
     id: 13,
     dimension: 'JP',
     title: {
-      en: 'Your cat\'s daily activity pattern is...',
+      en: "Your cat's daily activity pattern is...",
       zh: '你的猫的日常活动模式是...',
       ja: 'あなたの猫の毎日の活動パターンは...',
       ko: '당신의 고양이의 일상 활동 패턴은...',
@@ -375,7 +375,7 @@ export const purrjungQuestions: QuestionPair[] = [
     id: 15,
     dimension: 'JP',
     title: {
-      en: 'Your cat\'s energy bursts (zoomies) occur...',
+      en: "Your cat's energy bursts (zoomies) occur...",
       zh: '你的猫的能量爆发（疯跑）发生在...',
       ja: 'あなたの猫のエネルギー爆発（ズーミーズ）は...',
       ko: '당신의 고양이의 에너지 폭발(줌미)은...',
@@ -400,7 +400,7 @@ export const purrjungQuestions: QuestionPair[] = [
     id: 16,
     dimension: 'JP',
     title: {
-      en: 'When it\'s time for grooming or nail trimming, your cat...',
+      en: "When it's time for grooming or nail trimming, your cat...",
       zh: '当需要梳毛或剪指甲时，你的猫...',
       ja: 'グルーミングや爪切りの時間になると、あなたの猫は...',
       ko: '그루밍이나 발톱 다듬기 시간이 되면, 당신의 고양이는...',
diff --git a/src/purrjungScoring.test.ts b/src/purrjungScoring.test.ts
new file mode 100644
index 0000000..a17cb21
--- /dev/null
+++ b/src/purrjungScoring.test.ts
@@ -0,0 +1,130 @@
+import { describe, it, expect } from 'vitest';
+import {
+  PURRJUNG_SCORE_MIN,
+  PURRJUNG_SCORE_MAX,
+  PURRJUNG_THRESHOLD,
+  calculatePurrjungScores,
+  determinePurrjungType,
+  calculatePurrjungPercentages,
+  generatePurrjungResult,
+  isPurrjungTestComplete,
+  getPurrjungDimensionQuestionIds,
+} from './purrjungScoring.js';
+import {
+  purrjungQuestions,
+  purrjungDimensionQuestions,
+  sortedPurrjungQuestions,
+  PURRJUNG_TOTAL_QUESTIONS,
+  PURRJUNG_QUESTIONS_PER_DIMENSION,
+} from './purrjungQuestions.js';
+import type { Dimension, TestAnswers } from './types.js';
+
+const DIMENSIONS: Dimension[] = ['EI', 'SN', 'TF', 'JP'];
+
+function allAnswers(value: number): TestAnswers {
+  const answers: TestAnswers = {};
+  for (let i = 1; i <= PURRJUNG_TOTAL_QUESTIONS; i++) answers[i] = value;
+  return answers;
+}
+
+describe('PurrJung question bank', () => {
+  it('has 16 questions, 4 per dimension, with unique sequential IDs', () => {
+    expect(purrjungQuestions).toHaveLength(PURRJUNG_TOTAL_QUESTIONS);
+    expect(PURRJUNG_TOTAL_QUESTIONS).toBe(16);
+    expect(PURRJUNG_QUESTIONS_PER_DIMENSION).toBe(4);
+    expect(sortedPurrjungQuestions.map((q) => q.id)).toEqual(
+      Array.from({ length: 16 }, (_, i) => i + 1)
+    );
+    for (const dim of DIMENSIONS) {
+      expect(purrjungDimensionQuestions[dim]).toHaveLength(4);
+      expect(getPurrjungDimensionQuestionIds(dim)).toBe(purrjungDimensionQuestions[dim]);
+    }
+  });
+
+  it('assigns every question to the dimension that lists its ID', () => {
+    for (const question of purrjungQuestions) {
+      expect(purrjungDimensionQuestions[question.dimension]).toContain(question.id);
+    }
+  });
+});
+
+describe('calculatePurrjungScores', () => {
+  it('returns 4 per dimension when every answer is 1', () => {
+    expect(calculatePurrjungScores(allAnswers(1))).toEqual({ EI: 4, SN: 4, TF: 4, JP: 4 });
+  });
+
+  it('returns 20 per dimension when every answer is 5', () => {
+    expect(calculatePurrjungScores(allAnswers(5))).toEqual({ EI: 20, SN: 20, TF: 20, JP: 20 });
+  });
+
+  it('treats missing answers as neutral (3)', () => {
+    expect(calculatePurrjungScores({})).toEqual({ EI: 12, SN: 12, TF: 12, JP: 12 });
+  });
+
+  it('matches the exported range constants', () => {
+    expect(PURRJUNG_SCORE_MIN).toBe(4);
+    expect(PURRJUNG_SCORE_MAX).toBe(20);
+    expect(PURRJUNG_THRESHOLD).toBe(12);
+  });
+});
+
+describe('determinePurrjungType', () => {
+  it('resolves low scores to E, S, T, J (TF direction is inverted versus the human test)', () => {
+    expect(determinePurrjungType({ EI: 4, SN: 4, TF: 4, JP: 4 })).toBe('ESTJ');
+  });
+
+  it('resolves high scores to I, N, F, P', () => {
+    expect(determinePurrjungType({ EI: 20, SN: 20, TF: 20, JP: 20 })).toBe('INFP');
+  });
+
+  it('resolves the exact midpoint to the left pole', () => {
+    expect(determinePurrjungType({ EI: 12, SN: 12, TF: 12, JP: 12 })).toBe('ESTJ');
+    expect(determinePurrjungType({ EI: 13, SN: 13, TF: 13, JP: 13 })).toBe('INFP');
+  });
+});
+
+describe('calculatePurrjungPercentages', () => {
+  it('maps the minimum score to 100% left', () => {
+    const p = calculatePurrjungPercentages({ EI: 4, SN: 4, TF: 4, JP: 4 });
+    expect(p).toEqual({ E: 100, I: 0, S: 100, N: 0, T: 100, F: 0, J: 100, P: 0 });
+  });
+
+  it('maps the maximum score to 100% right', () => {
+    const p = calculatePurrjungPercentages({ EI: 20, SN: 20, TF: 20, JP: 20 });
+    expect(p).toEqual({ E: 0, I: 100, S: 0, N: 100, T: 0, F: 100, J: 0, P: 100 });
+  });
+
+  it('maps the midpoint to 50/50 and always sums each pair to 100', () => {
+    const p = calculatePurrjungPercentages({ EI: 12, SN: 12, TF: 12, JP: 12 });
+    expect(p.E).toBe(50);
+    expect(p.T).toBe(50);
+    for (let score = 4; score <= 20; score++) {
+      const q = calculatePurrjungPercentages({ EI: score, SN: score, TF: score, JP: score });
+      expect(q.E + q.I).toBe(100);
+      expect(q.S + q.N).toBe(100);
+      expect(q.T + q.F).toBe(100);
+      expect(q.J + q.P).toBe(100);
+    }
+  });
+});
+
+describe('generatePurrjungResult', () => {
+  it('combines scores, type and percentages', () => {
+    const answers: TestAnswers = { ...allAnswers(3), 1: 1, 2: 1, 3: 1, 4: 1, 13: 5, 14: 5 };
+    const result = generatePurrjungResult(answers);
+    expect(result.scores).toEqual({ EI: 4, SN: 12, TF: 12, JP: 16 });
+    expect(result.type).toBe('ESTP');
+    expect(result.percentages.E).toBe(100);
+    expect(result.percentages.P).toBe(75);
+  });
+});
+
+describe('isPurrjungTestComplete', () => {
+  it('is true for exactly 16 answers and false otherwise', () => {
+    expect(isPurrjungTestComplete({})).toBe(false);
+    expect(isPurrjungTestComplete(allAnswers(3))).toBe(true);
+    const fifteen = allAnswers(3);
+    delete fifteen[16];
+    expect(isPurrjungTestComplete(fifteen)).toBe(false);
+  });
+});
diff --git a/src/purrjungScoring.ts b/src/purrjungScoring.ts
index fcae465..fd5e244 100644
--- a/src/purrjungScoring.ts
+++ b/src/purrjungScoring.ts
@@ -1,5 +1,12 @@
-import { purrjungDimensionQuestions, PURRJUNG_TOTAL_QUESTIONS, PURRJUNG_QUESTIONS_PER_DIMENSION } from './purrjungQuestions';
-import type { TestAnswers, DimensionScores, DimensionPercentages, TestResult } from './types';
+import { purrjungDimensionQuestions, PURRJUNG_TOTAL_QUESTIONS } from './purrjungQuestions.js';
+import { scoresToPercentages, scoresToType, sumDimensions, type DimensionPoles } from './scale.js';
+import type {
+  TestAnswers,
+  DimensionScores,
+  DimensionPercentages,
+  TestResult,
+  Dimension,
+} from './types.js';
 
 /**
  * PurrJung Cat Personality Test Scoring
@@ -7,40 +14,41 @@ import type { TestAnswers, DimensionScores, DimensionPercentages, TestResult } f
  * Each dimension has 4 questions scored 1-5
  * Total range per dimension: 4-20
  *
- * Dimension scoring direction (same as human OEJTS):
+ * Dimension scoring direction:
  * - EI: Low (4-12) = Social (E), High (13-20) = Solitary (I)
  * - SN: Low (4-12) = Routine (S), High (13-20) = Novelty (N)
  * - TF: Low (4-12) = Independent (T), High (13-20) = Bonded (F)
  * - JP: Low (4-12) = Structured (J), High (13-20) = Spontaneous (P)
+ *
+ * Note that TF runs T → F here, the opposite of the human OEJTS test (F → T).
  */
 
 // Score range constants
-export const PURRJUNG_SCORE_MIN = 4;  // 4 questions × 1 = 4
+export const PURRJUNG_SCORE_MIN = 4; // 4 questions × 1 = 4
 export const PURRJUNG_SCORE_MAX = 20; // 4 questions × 5 = 20
 export const PURRJUNG_THRESHOLD = 12; // Midpoint of 4-20 range
 
+/** Pole letters: `[low score, high score]` per dimension. */
+const PURRJUNG_POLES: DimensionPoles = {
+  EI: ['E', 'I'], // Social ↔ Solitary
+  SN: ['S', 'N'], // Routine ↔ Novelty
+  TF: ['T', 'F'], // Independent ↔ Bonded
+  JP: ['J', 'P'], // Structured ↔ Spontaneous
+};
+
 /**
  * Calculate dimension scores from PurrJung test answers
  * Each dimension has 4 questions scored 1-5
  * Total range per dimension: 4-20
+ * Unanswered questions count as neutral (3).
  */
 export function calculatePurrjungScores(answers: TestAnswers): DimensionScores {
-  const scores: DimensionScores = { EI: 0, SN: 0, TF: 0, JP: 0 };
-
-  for (const [dimension, questionIds] of Object.entries(purrjungDimensionQuestions)) {
-    scores[dimension as keyof DimensionScores] = questionIds.reduce(
-      (sum, qId) => sum + (answers[qId] ?? 3), // Default to neutral (3) if missing
-      0
-    );
-  }
-
-  return scores;
+  return sumDimensions(answers, purrjungDimensionQuestions);
 }
 
 /**
  * Determine cat personality type from dimension scores
  *
- * Scoring direction matches human OEJTS:
  * - EI: Low = E (Social), High = I (Solitary)
  * - SN: Low = S (Routine), High = N (Novelty)
  * - TF: Low = T (Independent), High = F (Bonded)
@@ -49,12 +57,7 @@ export function calculatePurrjungScores(answers: TestAnswers): DimensionScores {
  * Threshold: 12 (midpoint of 4-20 range)
  */
 export function determinePurrjungType(scores: DimensionScores): string {
-  const e_i = scores.EI > PURRJUNG_THRESHOLD ? 'I' : 'E';
-  const s_n = scores.SN > PURRJUNG_THRESHOLD ? 'N' : 'S';
-  const t_f = scores.TF > PURRJUNG_THRESHOLD ? 'F' : 'T';
-  const j_p = scores.JP > PURRJUNG_THRESHOLD ? 'P' : 'J';
-
-  return `${e_i}${s_n}${t_f}${j_p}`;
+  return scoresToType(scores, PURRJUNG_THRESHOLD, PURRJUNG_POLES);
 }
 
 /**
@@ -62,28 +65,7 @@ export function determinePurrjungType(scores: DimensionScores): string {
  * Converts raw scores (4-20) to percentages (0-100)
  */
 export function calculatePurrjungPercentages(scores: DimensionScores): DimensionPercentages {
-  const toRightPercentage = (score: number): number => {
-    // Convert 4-20 range to 0-100
-    // Score 4 = 0% right, Score 20 = 100% right
-    const normalized = ((score - PURRJUNG_SCORE_MIN) / (PURRJUNG_SCORE_MAX - PURRJUNG_SCORE_MIN)) * 100;
-    return Math.round(normalized);
-  };
-
-  const eiRight = toRightPercentage(scores.EI); // I (Solitary) percentage
-  const snRight = toRightPercentage(scores.SN); // N (Novelty) percentage
-  const tfRight = toRightPercentage(scores.TF); // F (Bonded) percentage
-  const jpRight = toRightPercentage(scores.JP); // P (Spontaneous) percentage
-
-  return {
-    E: 100 - eiRight,  // Social
-    I: eiRight,        // Solitary
-    S: 100 - snRight,  // Routine
-    N: snRight,        // Novelty
-    T: 100 - tfRight,  // Independent
-    F: tfRight,        // Bonded
-    J: 100 - jpRight,  // Structured
-    P: jpRight,        // Spontaneous
-  };
+  return scoresToPercentages(scores, PURRJUNG_SCORE_MIN, PURRJUNG_SCORE_MAX, PURRJUNG_POLES);
 }
 
 /**
@@ -98,7 +80,7 @@ export function generatePurrjungResult(answers: TestAnswers): TestResult {
 }
 
 /**
- * Validate if all PurrJung test questions are answered
+ * Check whether exactly 16 answers have been recorded (count check only).
  */
 export function isPurrjungTestComplete(answers: TestAnswers): boolean {
   return Object.keys(answers).length === PURRJUNG_TOTAL_QUESTIONS;
@@ -107,6 +89,6 @@ export function isPurrjungTestComplete(answers: TestAnswers): boolean {
 /**
  * Get the question IDs for a specific dimension
  */
-export function getPurrjungDimensionQuestionIds(dimension: keyof DimensionScores): readonly number[] {
+export function getPurrjungDimensionQuestionIds(dimension: Dimension): readonly number[] {
   return purrjungDimensionQuestions[dimension];
 }
diff --git a/src/questions.test.ts b/src/questions.test.ts
index 663741d..d12b89c 100644
--- a/src/questions.test.ts
+++ b/src/questions.test.ts
@@ -6,10 +6,10 @@ import {
   dimensionQuestions,
   TOTAL_QUESTIONS,
   QUESTIONS_PER_DIMENSION,
-} from './questions';
-import { questionTranslations } from './questionTranslations';
-import { generateResult } from './scoring';
-import type { Dimension } from './types';
+} from './questions.js';
+import { questionTranslations } from './questionTranslations.js';
+import { generateResult } from './scoring.js';
+import type { Dimension } from './types.js';
 
 // Independent release contract, not derived from the data being checked.
 const originalLanguages = ['en', 'zh', 'ja', 'ko', 'zh-tw'];
diff --git a/src/questions.ts b/src/questions.ts
index 1c6dec0..3e27f9a 100644
--- a/src/questions.ts
+++ b/src/questions.ts
@@ -1,5 +1,5 @@
-import type { QuestionPair, DimensionQuestions } from './types';
-import { questionTranslations } from './questionTranslations';
+import type { QuestionPair, DimensionQuestions } from './types.js';
+import { questionTranslations } from './questionTranslations.js';
 
 /**
  * OEJTS 1.2 - 32 Questions
@@ -15,232 +15,802 @@ export const questions: QuestionPair[] = [
   {
     id: 1,
     dimension: 'JP',
-    title: { en: 'How do you track tasks?', zh: '你如何记录任务？', ja: 'タスクをどう管理する？', ko: '할 일을 어떻게 기록하나요?', 'zh-tw': '你如何記錄任務？' },
-    leftTrait: { en: 'Makes lists', zh: '制定清单', ja: 'リストを作る', ko: '목록을 만든다', 'zh-tw': '制定清單' },
-    rightTrait: { en: 'Relies on memory', zh: '依靠记忆', ja: '記憶に頼る', ko: '기억에 의존한다', 'zh-tw': '依靠記憶' },
+    title: {
+      en: 'How do you track tasks?',
+      zh: '你如何记录任务？',
+      ja: 'タスクをどう管理する？',
+      ko: '할 일을 어떻게 기록하나요?',
+      'zh-tw': '你如何記錄任務？',
+    },
+    leftTrait: {
+      en: 'Makes lists',
+      zh: '制定清单',
+      ja: 'リストを作る',
+      ko: '목록을 만든다',
+      'zh-tw': '制定清單',
+    },
+    rightTrait: {
+      en: 'Relies on memory',
+      zh: '依靠记忆',
+      ja: '記憶に頼る',
+      ko: '기억에 의존한다',
+      'zh-tw': '依靠記憶',
+    },
   },
   {
     id: 5,
     dimension: 'JP',
-    title: { en: 'How do you organize your space?', zh: '你如何整理空间？', ja: '身の回りの片づけは？', ko: '공간을 어떻게 정리하나요?', 'zh-tw': '你如何整理空間？' },
-    leftTrait: { en: 'Keeps a clean room', zh: '保持房间整洁', ja: '部屋をきれいに保つ', ko: '방을 깨끗이 유지한다', 'zh-tw': '保持房間整潔' },
-    rightTrait: { en: 'Just puts stuff wherever', zh: '随手放置东西', ja: '物はその辺に置きがち', ko: '물건을 아무데나 둔다', 'zh-tw': '隨手放置東西' },
+    title: {
+      en: 'How do you organize your space?',
+      zh: '你如何整理空间？',
+      ja: '身の回りの片づけは？',
+      ko: '공간을 어떻게 정리하나요?',
+      'zh-tw': '你如何整理空間？',
+    },
+    leftTrait: {
+      en: 'Keeps a clean room',
+      zh: '保持房间整洁',
+      ja: '部屋をきれいに保つ',
+      ko: '방을 깨끗이 유지한다',
+      'zh-tw': '保持房間整潔',
+    },
+    rightTrait: {
+      en: 'Just puts stuff wherever',
+      zh: '随手放置东西',
+      ja: '物はその辺に置きがち',
+      ko: '물건을 아무데나 둔다',
+      'zh-tw': '隨手放置東西',
+    },
   },
   {
     id: 9,
     dimension: 'JP',
-    title: { en: 'How would you describe your lifestyle?', zh: '你如何形容自己的生活方式？', ja: 'あなたの生活スタイルは？', ko: '당신의 생활 방식은?', 'zh-tw': '你如何形容自己的生活方式？' },
-    leftTrait: { en: 'Organized', zh: '有条理', ja: '整理整頓されている', ko: '체계적이다', 'zh-tw': '有條理' },
-    rightTrait: { en: 'Chaotic', zh: '随性混乱', ja: '成り行きまかせ', ko: '혼란스럽다', 'zh-tw': '隨性混亂' },
+    title: {
+      en: 'How would you describe your lifestyle?',
+      zh: '你如何形容自己的生活方式？',
+      ja: 'あなたの生活スタイルは？',
+      ko: '당신의 생활 방식은?',
+      'zh-tw': '你如何形容自己的生活方式？',
+    },
+    leftTrait: {
+      en: 'Organized',
+      zh: '有条理',
+      ja: '整理整頓されている',
+      ko: '체계적이다',
+      'zh-tw': '有條理',
+    },
+    rightTrait: {
+      en: 'Chaotic',
+      zh: '随性混乱',
+      ja: '成り行きまかせ',
+      ko: '혼란스럽다',
+      'zh-tw': '隨性混亂',
+    },
   },
   {
     id: 13,
     dimension: 'JP',
-    title: { en: 'When do you make plans?', zh: '你何时制定计划？', ja: 'いつ計画を立てる？', ko: '언제 계획을 세우나요?', 'zh-tw': '你何時制定計劃？' },
-    leftTrait: { en: 'Plans far ahead', zh: '提前规划', ja: 'かなり前から計画する', ko: '미리 계획한다', 'zh-tw': '提前規劃' },
-    rightTrait: { en: 'Plans at the last minute', zh: '最后一刻才计划', ja: '直前に計画する', ko: '마지막에 계획한다', 'zh-tw': '最後一刻才計劃' },
+    title: {
+      en: 'When do you make plans?',
+      zh: '你何时制定计划？',
+      ja: 'いつ計画を立てる？',
+      ko: '언제 계획을 세우나요?',
+      'zh-tw': '你何時制定計劃？',
+    },
+    leftTrait: {
+      en: 'Plans far ahead',
+      zh: '提前规划',
+      ja: 'かなり前から計画する',
+      ko: '미리 계획한다',
+      'zh-tw': '提前規劃',
+    },
+    rightTrait: {
+      en: 'Plans at the last minute',
+      zh: '最后一刻才计划',
+      ja: '直前に計画する',
+      ko: '마지막에 계획한다',
+      'zh-tw': '最後一刻才計劃',
+    },
   },
   {
     id: 17,
     dimension: 'JP',
-    title: { en: 'How do you approach decisions?', zh: '你如何做决定？', ja: '決めるときは？', ko: '결정을 어떻게 내리나요?', 'zh-tw': '你如何做決定？' },
-    leftTrait: { en: 'Commits', zh: '做出承诺', ja: 'きっぱり決める', ko: '약속한다', 'zh-tw': '做出承諾' },
-    rightTrait: { en: 'Keeps options open', zh: '保留选择', ja: '選択肢を残しておく', ko: '선택지를 열어둔다', 'zh-tw': '保留選擇' },
+    title: {
+      en: 'How do you approach decisions?',
+      zh: '你如何做决定？',
+      ja: '決めるときは？',
+      ko: '결정을 어떻게 내리나요?',
+      'zh-tw': '你如何做決定？',
+    },
+    leftTrait: {
+      en: 'Commits',
+      zh: '做出承诺',
+      ja: 'きっぱり決める',
+      ko: '약속한다',
+      'zh-tw': '做出承諾',
+    },
+    rightTrait: {
+      en: 'Keeps options open',
+      zh: '保留选择',
+      ja: '選択肢を残しておく',
+      ko: '선택지를 열어둔다',
+      'zh-tw': '保留選擇',
+    },
   },
   {
     id: 21,
     dimension: 'JP',
-    title: { en: 'When do you complete tasks?', zh: '你何时完成任务？', ja: 'やるべきことは？', ko: '언제 일을 끝내나요?', 'zh-tw': '你何時完成任務？' },
-    leftTrait: { en: 'Gets work done right away', zh: '立即完成工作', ja: 'すぐに片づける', ko: '일을 바로 끝낸다', 'zh-tw': '立即完成工作' },
-    rightTrait: { en: 'Procrastinates', zh: '拖延', ja: '先延ばしにする', ko: '미룬다', 'zh-tw': '拖延' },
+    title: {
+      en: 'When do you complete tasks?',
+      zh: '你何时完成任务？',
+      ja: 'やるべきことは？',
+      ko: '언제 일을 끝내나요?',
+      'zh-tw': '你何時完成任務？',
+    },
+    leftTrait: {
+      en: 'Gets work done right away',
+      zh: '立即完成工作',
+      ja: 'すぐに片づける',
+      ko: '일을 바로 끝낸다',
+      'zh-tw': '立即完成工作',
+    },
+    rightTrait: {
+      en: 'Procrastinates',
+      zh: '拖延',
+      ja: '先延ばしにする',
+      ko: '미룬다',
+      'zh-tw': '拖延',
+    },
   },
   {
     id: 25,
     dimension: 'JP',
-    title: { en: 'How do you handle new situations?', zh: '你如何应对新情况？', ja: '初めての状況では？', ko: '새로운 상황에 어떻게 대처하나요?', 'zh-tw': '你如何應對新情況？' },
-    leftTrait: { en: 'Prepares', zh: '提前准备', ja: '準備する', ko: '준비한다', 'zh-tw': '提前準備' },
-    rightTrait: { en: 'Improvises', zh: '即兴发挥', ja: 'その場で対応する', ko: '즉흥적으로 한다', 'zh-tw': '即興發揮' },
+    title: {
+      en: 'How do you handle new situations?',
+      zh: '你如何应对新情况？',
+      ja: '初めての状況では？',
+      ko: '새로운 상황에 어떻게 대처하나요?',
+      'zh-tw': '你如何應對新情況？',
+    },
+    leftTrait: {
+      en: 'Prepares',
+      zh: '提前准备',
+      ja: '準備する',
+      ko: '준비한다',
+      'zh-tw': '提前準備',
+    },
+    rightTrait: {
+      en: 'Improvises',
+      zh: '即兴发挥',
+      ja: 'その場で対応する',
+      ko: '즉흥적으로 한다',
+      'zh-tw': '即興發揮',
+    },
   },
   {
     id: 29,
     dimension: 'JP',
-    title: { en: 'What drives you more?', zh: '什么更能驱动你？', ja: 'どちらに力を注ぐ？', ko: '무엇이 당신을 움직이나요?', 'zh-tw': '什麼更能驅動你？' },
-    leftTrait: { en: 'Works hard', zh: '努力工作', ja: 'とことん頑張る', ko: '열심히 일한다', 'zh-tw': '努力工作' },
-    rightTrait: { en: 'Plays hard', zh: '尽情玩乐', ja: '思い切り遊ぶ', ko: '열심히 논다', 'zh-tw': '盡情玩樂' },
+    title: {
+      en: 'What drives you more?',
+      zh: '什么更能驱动你？',
+      ja: 'どちらに力を注ぐ？',
+      ko: '무엇이 당신을 움직이나요?',
+      'zh-tw': '什麼更能驅動你？',
+    },
+    leftTrait: {
+      en: 'Works hard',
+      zh: '努力工作',
+      ja: 'とことん頑張る',
+      ko: '열심히 일한다',
+      'zh-tw': '努力工作',
+    },
+    rightTrait: {
+      en: 'Plays hard',
+      zh: '尽情玩乐',
+      ja: '思い切り遊ぶ',
+      ko: '열심히 논다',
+      'zh-tw': '盡情玩樂',
+    },
   },
 
   // TF dimension (Questions 2, 6, 10, 14, 18, 22, 26, 30)
   {
     id: 2,
     dimension: 'TF',
-    title: { en: 'How do you approach new information?', zh: '你如何看待新信息？', ja: '新しい情報に対しては？', ko: '새로운 정보를 어떻게 받아들이나요?', 'zh-tw': '你如何看待新資訊？' },
-    leftTrait: { en: 'Wants to believe', zh: '愿意相信', ja: 'まず信じたい', ko: '믿고 싶어한다', 'zh-tw': '願意相信' },
-    rightTrait: { en: 'Skeptical', zh: '持怀疑态度', ja: 'まず疑ってみる', ko: '회의적이다', 'zh-tw': '持懷疑態度' },
+    title: {
+      en: 'How do you approach new information?',
+      zh: '你如何看待新信息？',
+      ja: '新しい情報に対しては？',
+      ko: '새로운 정보를 어떻게 받아들이나요?',
+      'zh-tw': '你如何看待新資訊？',
+    },
+    leftTrait: {
+      en: 'Wants to believe',
+      zh: '愿意相信',
+      ja: 'まず信じたい',
+      ko: '믿고 싶어한다',
+      'zh-tw': '願意相信',
+    },
+    rightTrait: {
+      en: 'Skeptical',
+      zh: '持怀疑态度',
+      ja: 'まず疑ってみる',
+      ko: '회의적이다',
+      'zh-tw': '持懷疑態度',
+    },
   },
   {
     id: 6,
     dimension: 'TF',
-    title: { en: 'How do you view logical thinking?', zh: '你如何看待逻辑思维？', ja: '「ロボットみたい」と言われたら？', ko: '논리적 사고를 어떻게 생각하나요?', 'zh-tw': '你如何看待邏輯思維？' },
-    leftTrait: { en: 'Thinks "robotic" is an insult', zh: '认为"像机器人"是侮辱', ja: '悪口だと感じる', ko: '"로봇 같다"는 말을 모욕으로 여긴다', 'zh-tw': '認為「像機器人」是侮辱' },
-    rightTrait: { en: 'Strives to have a mechanical mind', zh: '追求机械般的思维', ja: 'むしろそうありたい', ko: '기계적인 사고를 추구한다', 'zh-tw': '追求機械般的思維' },
+    title: {
+      en: 'How do you view logical thinking?',
+      zh: '你如何看待逻辑思维？',
+      ja: '「ロボットみたい」と言われたら？',
+      ko: '논리적 사고를 어떻게 생각하나요?',
+      'zh-tw': '你如何看待邏輯思維？',
+    },
+    leftTrait: {
+      en: 'Thinks "robotic" is an insult',
+      zh: '认为"像机器人"是侮辱',
+      ja: '悪口だと感じる',
+      ko: '"로봇 같다"는 말을 모욕으로 여긴다',
+      'zh-tw': '認為「像機器人」是侮辱',
+    },
+    rightTrait: {
+      en: 'Strives to have a mechanical mind',
+      zh: '追求机械般的思维',
+      ja: 'むしろそうありたい',
+      ko: '기계적인 사고를 추구한다',
+      'zh-tw': '追求機械般的思維',
+    },
   },
   {
     id: 10,
     dimension: 'TF',
-    title: { en: 'How do you handle criticism?', zh: '你如何应对批评？', ja: '批判されると？', ko: '비판을 어떻게 받아들이나요?', 'zh-tw': '你如何應對批評？' },
-    leftTrait: { en: 'Easily hurt', zh: '容易受伤', ja: '傷つきやすい', ko: '쉽게 상처받는다', 'zh-tw': '容易受傷' },
-    rightTrait: { en: 'Thick-skinned', zh: '脸皮厚', ja: '気にしない', ko: '둔감하다', 'zh-tw': '臉皮厚' },
+    title: {
+      en: 'How do you handle criticism?',
+      zh: '你如何应对批评？',
+      ja: '批判されると？',
+      ko: '비판을 어떻게 받아들이나요?',
+      'zh-tw': '你如何應對批評？',
+    },
+    leftTrait: {
+      en: 'Easily hurt',
+      zh: '容易受伤',
+      ja: '傷つきやすい',
+      ko: '쉽게 상처받는다',
+      'zh-tw': '容易受傷',
+    },
+    rightTrait: {
+      en: 'Thick-skinned',
+      zh: '脸皮厚',
+      ja: '気にしない',
+      ko: '둔감하다',
+      'zh-tw': '臉皮厚',
+    },
   },
   {
     id: 14,
     dimension: 'TF',
-    title: { en: 'What do you seek from others?', zh: '你希望从他人那里得到什么？', ja: '他者から何を求める？', ko: '다른 사람에게서 무엇을 원하나요?', 'zh-tw': '你希望從他人那裡得到什麼？' },
-    leftTrait: { en: "Wants people's love", zh: '渴望他人的爱', ja: '人々の愛を求める', ko: '사람들의 사랑을 원한다', 'zh-tw': '渴望他人的愛' },
-    rightTrait: { en: "Wants people's respect", zh: '渴望他人的尊重', ja: '人々の尊敬を求める', ko: '사람들의 존경을 원한다', 'zh-tw': '渴望他人的尊重' },
+    title: {
+      en: 'What do you seek from others?',
+      zh: '你希望从他人那里得到什么？',
+      ja: '他者から何を求める？',
+      ko: '다른 사람에게서 무엇을 원하나요?',
+      'zh-tw': '你希望從他人那裡得到什麼？',
+    },
+    leftTrait: {
+      en: "Wants people's love",
+      zh: '渴望他人的爱',
+      ja: '人々の愛を求める',
+      ko: '사람들의 사랑을 원한다',
+      'zh-tw': '渴望他人的愛',
+    },
+    rightTrait: {
+      en: "Wants people's respect",
+      zh: '渴望他人的尊重',
+      ja: '人々の尊敬を求める',
+      ko: '사람들의 존경을 원한다',
+      'zh-tw': '渴望他人的尊重',
+    },
   },
   {
     id: 18,
     dimension: 'TF',
-    title: { en: 'What would you like to be good at?', zh: '你想擅长什么？', ja: '得意になりたいのは？', ko: '무엇을 잘하고 싶나요?', 'zh-tw': '你想擅長什麼？' },
-    leftTrait: { en: 'Wants to be good at fixing people', zh: '想擅长帮助他人', ja: '人の悩みを解きほぐすこと', ko: '사람을 돕는 것을 잘하고 싶다', 'zh-tw': '想擅長幫助他人' },
-    rightTrait: { en: 'Wants to be good at fixing things', zh: '想擅长修理事物', ja: '壊れた物を直すこと', ko: '물건을 고치는 것을 잘하고 싶다', 'zh-tw': '想擅長修理事物' },
+    title: {
+      en: 'What would you like to be good at?',
+      zh: '你想擅长什么？',
+      ja: '得意になりたいのは？',
+      ko: '무엇을 잘하고 싶나요?',
+      'zh-tw': '你想擅長什麼？',
+    },
+    leftTrait: {
+      en: 'Wants to be good at fixing people',
+      zh: '想擅长帮助他人',
+      ja: '人の悩みを解きほぐすこと',
+      ko: '사람을 돕는 것을 잘하고 싶다',
+      'zh-tw': '想擅長幫助他人',
+    },
+    rightTrait: {
+      en: 'Wants to be good at fixing things',
+      zh: '想擅长修理事物',
+      ja: '壊れた物を直すこと',
+      ko: '물건을 고치는 것을 잘하고 싶다',
+      'zh-tw': '想擅長修理事物',
+    },
   },
   {
     id: 22,
     dimension: 'TF',
-    title: { en: 'How do you make decisions?', zh: '你如何做决定？', ja: '決めるときの決め手は？', ko: '어떻게 결정을 내리나요?', 'zh-tw': '你如何做決定？' },
-    leftTrait: { en: 'Follows the heart', zh: '跟随内心', ja: '気持ち', ko: '마음을 따른다', 'zh-tw': '跟隨內心' },
-    rightTrait: { en: 'Follows the head', zh: '跟随理性', ja: '理屈', ko: '이성을 따른다', 'zh-tw': '跟隨理性' },
+    title: {
+      en: 'How do you make decisions?',
+      zh: '你如何做决定？',
+      ja: '決めるときの決め手は？',
+      ko: '어떻게 결정을 내리나요?',
+      'zh-tw': '你如何做決定？',
+    },
+    leftTrait: {
+      en: 'Follows the heart',
+      zh: '跟随内心',
+      ja: '気持ち',
+      ko: '마음을 따른다',
+      'zh-tw': '跟隨內心',
+    },
+    rightTrait: {
+      en: 'Follows the head',
+      zh: '跟随理性',
+      ja: '理屈',
+      ko: '이성을 따른다',
+      'zh-tw': '跟隨理性',
+    },
   },
   {
     id: 26,
     dimension: 'TF',
-    title: { en: 'What is morality based on?', zh: '道德的基础是什么？', ja: '善悪の判断のよりどころは？', ko: '도덕의 기반은 무엇인가요?', 'zh-tw': '道德的基礎是什麼？' },
-    leftTrait: { en: 'Bases morality on compassion', zh: '道德基于同情', ja: '思いやり', ko: '도덕은 동정심에 기반한다', 'zh-tw': '道德基於同情' },
-    rightTrait: { en: 'Bases morality on justice', zh: '道德基于正义', ja: '公正さ', ko: '도덕은 정의에 기반한다', 'zh-tw': '道德基於正義' },
+    title: {
+      en: 'What is morality based on?',
+      zh: '道德的基础是什么？',
+      ja: '善悪の判断のよりどころは？',
+      ko: '도덕의 기반은 무엇인가요?',
+      'zh-tw': '道德的基礎是什麼？',
+    },
+    leftTrait: {
+      en: 'Bases morality on compassion',
+      zh: '道德基于同情',
+      ja: '思いやり',
+      ko: '도덕은 동정심에 기반한다',
+      'zh-tw': '道德基於同情',
+    },
+    rightTrait: {
+      en: 'Bases morality on justice',
+      zh: '道德基于正义',
+      ja: '公正さ',
+      ko: '도덕은 정의에 기반한다',
+      'zh-tw': '道德基於正義',
+    },
   },
   {
     id: 30,
     dimension: 'TF',
-    title: { en: 'How do you relate to emotions?', zh: '你如何看待情感？', ja: '感情については？', ko: '감정을 어떻게 대하나요?', 'zh-tw': '你如何看待情感？' },
-    leftTrait: { en: 'Values emotions', zh: '重视情感', ja: '感情を大切にする', ko: '감정을 중시한다', 'zh-tw': '重視情感' },
-    rightTrait: { en: 'Uncomfortable with emotions', zh: '对情感感到不自在', ja: '感情を扱うのは苦手', ko: '감정이 불편하다', 'zh-tw': '對情感感到不自在' },
+    title: {
+      en: 'How do you relate to emotions?',
+      zh: '你如何看待情感？',
+      ja: '感情については？',
+      ko: '감정을 어떻게 대하나요?',
+      'zh-tw': '你如何看待情感？',
+    },
+    leftTrait: {
+      en: 'Values emotions',
+      zh: '重视情感',
+      ja: '感情を大切にする',
+      ko: '감정을 중시한다',
+      'zh-tw': '重視情感',
+    },
+    rightTrait: {
+      en: 'Uncomfortable with emotions',
+      zh: '对情感感到不自在',
+      ja: '感情を扱うのは苦手',
+      ko: '감정이 불편하다',
+      'zh-tw': '對情感感到不自在',
+    },
   },
 
   // EI dimension (Questions 3, 7, 11, 15, 19, 23, 27, 31)
   {
     id: 3,
     dimension: 'EI',
-    title: { en: 'How do you feel about being alone?', zh: '你对独处有什么感受？', ja: '一人の時間は？', ko: '혼자 있는 것을 어떻게 느끼나요?', 'zh-tw': '你對獨處有什麼感受？' },
-    leftTrait: { en: 'Bored by time alone', zh: '独处时感到无聊', ja: '退屈に感じる', ko: '혼자 있으면 지루하다', 'zh-tw': '獨處時感到無聊' },
-    rightTrait: { en: 'Needs time alone', zh: '需要独处时间', ja: 'なくてはならない', ko: '혼자만의 시간이 필요하다', 'zh-tw': '需要獨處時間' },
+    title: {
+      en: 'How do you feel about being alone?',
+      zh: '你对独处有什么感受？',
+      ja: '一人の時間は？',
+      ko: '혼자 있는 것을 어떻게 느끼나요?',
+      'zh-tw': '你對獨處有什麼感受？',
+    },
+    leftTrait: {
+      en: 'Bored by time alone',
+      zh: '独处时感到无聊',
+      ja: '退屈に感じる',
+      ko: '혼자 있으면 지루하다',
+      'zh-tw': '獨處時感到無聊',
+    },
+    rightTrait: {
+      en: 'Needs time alone',
+      zh: '需要独处时间',
+      ja: 'なくてはならない',
+      ko: '혼자만의 시간이 필요하다',
+      'zh-tw': '需要獨處時間',
+    },
   },
   {
     id: 7,
     dimension: 'EI',
-    title: { en: 'What is your energy level like?', zh: '你的能量状态如何？', ja: '普段のテンションは？', ko: '당신의 에너지 수준은?', 'zh-tw': '你的能量狀態如何？' },
-    leftTrait: { en: 'Energetic', zh: '精力充沛', ja: 'エネルギッシュ', ko: '활기차다', 'zh-tw': '精力充沛' },
+    title: {
+      en: 'What is your energy level like?',
+      zh: '你的能量状态如何？',
+      ja: '普段のテンションは？',
+      ko: '당신의 에너지 수준은?',
+      'zh-tw': '你的能量狀態如何？',
+    },
+    leftTrait: {
+      en: 'Energetic',
+      zh: '精力充沛',
+      ja: 'エネルギッシュ',
+      ko: '활기차다',
+      'zh-tw': '精力充沛',
+    },
     rightTrait: { en: 'Mellow', zh: '平静温和', ja: '穏やか', ko: '차분하다', 'zh-tw': '平靜溫和' },
   },
   {
     id: 11,
     dimension: 'EI',
-    title: { en: 'How do you work best?', zh: '你在什么环境下工作最好？', ja: '力を発揮しやすいのは？', ko: '어떤 환경에서 가장 잘 일하나요?', 'zh-tw': '你在什麼環境下工作最好？' },
-    leftTrait: { en: 'Works best in groups', zh: '在团队中表现最佳', ja: 'みんなで取り組むとき', ko: '팀에서 일할 때 최고다', 'zh-tw': '在團隊中表現最佳' },
-    rightTrait: { en: 'Works best alone', zh: '独自工作表现最佳', ja: '一人で取り組むとき', ko: '혼자 일할 때 최고다', 'zh-tw': '獨自工作表現最佳' },
+    title: {
+      en: 'How do you work best?',
+      zh: '你在什么环境下工作最好？',
+      ja: '力を発揮しやすいのは？',
+      ko: '어떤 환경에서 가장 잘 일하나요?',
+      'zh-tw': '你在什麼環境下工作最好？',
+    },
+    leftTrait: {
+      en: 'Works best in groups',
+      zh: '在团队中表现最佳',
+      ja: 'みんなで取り組むとき',
+      ko: '팀에서 일할 때 최고다',
+      'zh-tw': '在團隊中表現最佳',
+    },
+    rightTrait: {
+      en: 'Works best alone',
+      zh: '独自工作表现最佳',
+      ja: '一人で取り組むとき',
+      ko: '혼자 일할 때 최고다',
+      'zh-tw': '獨自工作表現最佳',
+    },
   },
   {
     id: 15,
     dimension: 'EI',
-    title: { en: 'How do parties make you feel?', zh: '聚会让你感觉如何？', ja: '大人数の集まりでは？', ko: '파티에서 어떤 기분이 드나요?', 'zh-tw': '聚會讓你感覺如何？' },
-    leftTrait: { en: 'Gets fired up by parties', zh: '因聚会而兴奋', ja: '元気が出る', ko: '파티에서 흥분한다', 'zh-tw': '因聚會而興奮' },
-    rightTrait: { en: 'Gets worn out by parties', zh: '因聚会而疲惫', ja: '疲れてしまう', ko: '파티에서 지친다', 'zh-tw': '因聚會而疲憊' },
+    title: {
+      en: 'How do parties make you feel?',
+      zh: '聚会让你感觉如何？',
+      ja: '大人数の集まりでは？',
+      ko: '파티에서 어떤 기분이 드나요?',
+      'zh-tw': '聚會讓你感覺如何？',
+    },
+    leftTrait: {
+      en: 'Gets fired up by parties',
+      zh: '因聚会而兴奋',
+      ja: '元気が出る',
+      ko: '파티에서 흥분한다',
+      'zh-tw': '因聚會而興奮',
+    },
+    rightTrait: {
+      en: 'Gets worn out by parties',
+      zh: '因聚会而疲惫',
+      ja: '疲れてしまう',
+      ko: '파티에서 지친다',
+      'zh-tw': '因聚會而疲憊',
+    },
   },
   {
     id: 19,
     dimension: 'EI',
-    title: { en: 'In conversations, do you...', zh: '在交谈中，你更倾向于...', ja: '会話では？', ko: '대화할 때 당신은...', 'zh-tw': '在交談中，你更傾向於...' },
-    leftTrait: { en: 'Talks more', zh: '话比较多', ja: 'よく話す', ko: '말을 많이 한다', 'zh-tw': '話比較多' },
-    rightTrait: { en: 'Listens more', zh: '更善于倾听', ja: 'よく聞く', ko: '듣는 편이다', 'zh-tw': '更善於傾聽' },
+    title: {
+      en: 'In conversations, do you...',
+      zh: '在交谈中，你更倾向于...',
+      ja: '会話では？',
+      ko: '대화할 때 당신은...',
+      'zh-tw': '在交談中，你更傾向於...',
+    },
+    leftTrait: {
+      en: 'Talks more',
+      zh: '话比较多',
+      ja: 'よく話す',
+      ko: '말을 많이 한다',
+      'zh-tw': '話比較多',
+    },
+    rightTrait: {
+      en: 'Listens more',
+      zh: '更善于倾听',
+      ja: 'よく聞く',
+      ko: '듣는 편이다',
+      'zh-tw': '更善於傾聽',
+    },
   },
   {
     id: 23,
     dimension: 'EI',
-    title: { en: 'What do you prefer on weekends?', zh: '周末你更喜欢做什么？', ja: '週末は？', ko: '주말에 무엇을 하고 싶나요?', 'zh-tw': '週末你更喜歡做什麼？' },
-    leftTrait: { en: 'Goes out on the town', zh: '喜欢外出活动', ja: '外に出かける', ko: '외출을 즐긴다', 'zh-tw': '喜歡外出活動' },
-    rightTrait: { en: 'Stays at home', zh: '喜欢待在家里', ja: '家で過ごす', ko: '집에 있는 것을 좋아한다', 'zh-tw': '喜歡待在家裡' },
+    title: {
+      en: 'What do you prefer on weekends?',
+      zh: '周末你更喜欢做什么？',
+      ja: '週末は？',
+      ko: '주말에 무엇을 하고 싶나요?',
+      'zh-tw': '週末你更喜歡做什麼？',
+    },
+    leftTrait: {
+      en: 'Goes out on the town',
+      zh: '喜欢外出活动',
+      ja: '外に出かける',
+      ko: '외출을 즐긴다',
+      'zh-tw': '喜歡外出活動',
+    },
+    rightTrait: {
+      en: 'Stays at home',
+      zh: '喜欢待在家里',
+      ja: '家で過ごす',
+      ko: '집에 있는 것을 좋아한다',
+      'zh-tw': '喜歡待在家裡',
+    },
   },
   {
     id: 27,
     dimension: 'EI',
-    title: { en: 'How loud is your natural voice?', zh: '你的自然音量如何？', ja: '声の大きさは？', ko: '당신의 자연스러운 목소리는?', 'zh-tw': '你的自然音量如何？' },
-    leftTrait: { en: 'Yelling comes naturally', zh: '自然而然大声说话', ja: '大きな声が自然に出る', ko: '큰 소리가 자연스럽다', 'zh-tw': '自然而然大聲說話' },
-    rightTrait: { en: 'Finds it difficult to yell loudly', zh: '很难大声喊叫', ja: '大声を出すのが苦手', ko: '큰 소리를 내기 어렵다', 'zh-tw': '很難大聲喊叫' },
+    title: {
+      en: 'How loud is your natural voice?',
+      zh: '你的自然音量如何？',
+      ja: '声の大きさは？',
+      ko: '당신의 자연스러운 목소리는?',
+      'zh-tw': '你的自然音量如何？',
+    },
+    leftTrait: {
+      en: 'Yelling comes naturally',
+      zh: '自然而然大声说话',
+      ja: '大きな声が自然に出る',
+      ko: '큰 소리가 자연스럽다',
+      'zh-tw': '自然而然大聲說話',
+    },
+    rightTrait: {
+      en: 'Finds it difficult to yell loudly',
+      zh: '很难大声喊叫',
+      ja: '大声を出すのが苦手',
+      ko: '큰 소리를 내기 어렵다',
+      'zh-tw': '很難大聲喊叫',
+    },
   },
   {
     id: 31,
     dimension: 'EI',
-    title: { en: 'How do you feel about being in the spotlight?', zh: '你对成为焦点有什么感受？', ja: '注目されるのは？', ko: '주목받는 것을 어떻게 느끼나요?', 'zh-tw': '你對成為焦點有什麼感受？' },
-    leftTrait: { en: 'Likes to perform', zh: '喜欢表演', ja: '人前に立つのが好き', ko: '공연하는 것을 좋아한다', 'zh-tw': '喜歡表演' },
-    rightTrait: { en: 'Avoids public speaking', zh: '避免公开演讲', ja: 'できれば避けたい', ko: '대중 앞에서 말하기를 피한다', 'zh-tw': '避免公開演講' },
+    title: {
+      en: 'How do you feel about being in the spotlight?',
+      zh: '你对成为焦点有什么感受？',
+      ja: '注目されるのは？',
+      ko: '주목받는 것을 어떻게 느끼나요?',
+      'zh-tw': '你對成為焦點有什麼感受？',
+    },
+    leftTrait: {
+      en: 'Likes to perform',
+      zh: '喜欢表演',
+      ja: '人前に立つのが好き',
+      ko: '공연하는 것을 좋아한다',
+      'zh-tw': '喜歡表演',
+    },
+    rightTrait: {
+      en: 'Avoids public speaking',
+      zh: '避免公开演讲',
+      ja: 'できれば避けたい',
+      ko: '대중 앞에서 말하기를 피한다',
+      'zh-tw': '避免公開演講',
+    },
   },
 
   // SN dimension (Questions 4, 8, 12, 16, 20, 24, 28, 32)
   {
     id: 4,
     dimension: 'SN',
-    title: { en: 'How do you view the status quo?', zh: '你如何看待现状？', ja: '今の状況については？', ko: '현 상황을 어떻게 보나요?', 'zh-tw': '你如何看待現狀？' },
-    leftTrait: { en: 'Accepts things as they are', zh: '接受事物的本来面目', ja: 'あるがままを受け入れる', ko: '있는 그대로 받아들인다', 'zh-tw': '接受事物的本來面目' },
-    rightTrait: { en: 'Unsatisfied with the way things are', zh: '对现状不满足', ja: '今のままでは物足りない', ko: '현 상황에 만족하지 않는다', 'zh-tw': '對現狀不滿足' },
+    title: {
+      en: 'How do you view the status quo?',
+      zh: '你如何看待现状？',
+      ja: '今の状況については？',
+      ko: '현 상황을 어떻게 보나요?',
+      'zh-tw': '你如何看待現狀？',
+    },
+    leftTrait: {
+      en: 'Accepts things as they are',
+      zh: '接受事物的本来面目',
+      ja: 'あるがままを受け入れる',
+      ko: '있는 그대로 받아들인다',
+      'zh-tw': '接受事物的本來面目',
+    },
+    rightTrait: {
+      en: 'Unsatisfied with the way things are',
+      zh: '对现状不满足',
+      ja: '今のままでは物足りない',
+      ko: '현 상황에 만족하지 않는다',
+      'zh-tw': '對現狀不滿足',
+    },
   },
   {
     id: 8,
     dimension: 'SN',
-    title: { en: 'What type of test do you prefer?', zh: '你喜欢什么类型的考试？', ja: '好きな試験形式は？', ko: '어떤 유형의 시험을 선호하나요?', 'zh-tw': '你喜歡什麼類型的考試？' },
-    leftTrait: { en: 'Prefers multiple choice test', zh: '喜欢选择题', ja: '選択問題', ko: '객관식을 선호한다', 'zh-tw': '喜歡選擇題' },
-    rightTrait: { en: 'Prefers essay answers', zh: '喜欢论述题', ja: '記述問題', ko: '서술형을 선호한다', 'zh-tw': '喜歡論述題' },
+    title: {
+      en: 'What type of test do you prefer?',
+      zh: '你喜欢什么类型的考试？',
+      ja: '好きな試験形式は？',
+      ko: '어떤 유형의 시험을 선호하나요?',
+      'zh-tw': '你喜歡什麼類型的考試？',
+    },
+    leftTrait: {
+      en: 'Prefers multiple choice test',
+      zh: '喜欢选择题',
+      ja: '選択問題',
+      ko: '객관식을 선호한다',
+      'zh-tw': '喜歡選擇題',
+    },
+    rightTrait: {
+      en: 'Prefers essay answers',
+      zh: '喜欢论述题',
+      ja: '記述問題',
+      ko: '서술형을 선호한다',
+      'zh-tw': '喜歡論述題',
+    },
   },
   {
     id: 12,
     dimension: 'SN',
-    title: { en: 'Where is your focus in time?', zh: '你的时间焦点在哪里？', ja: '意識が向くのは？', ko: '시간의 초점은 어디에 있나요?', 'zh-tw': '你的時間焦點在哪裡？' },
-    leftTrait: { en: 'Focused on the past', zh: '关注过去', ja: '過去のこと', ko: '과거에 집중한다', 'zh-tw': '關注過去' },
-    rightTrait: { en: 'Focused on the future', zh: '关注未来', ja: '未来のこと', ko: '미래에 집중한다', 'zh-tw': '關注未來' },
+    title: {
+      en: 'Where is your focus in time?',
+      zh: '你的时间焦点在哪里？',
+      ja: '意識が向くのは？',
+      ko: '시간의 초점은 어디에 있나요?',
+      'zh-tw': '你的時間焦點在哪裡？',
+    },
+    leftTrait: {
+      en: 'Focused on the past',
+      zh: '关注过去',
+      ja: '過去のこと',
+      ko: '과거에 집중한다',
+      'zh-tw': '關注過去',
+    },
+    rightTrait: {
+      en: 'Focused on the future',
+      zh: '关注未来',
+      ja: '未来のこと',
+      ko: '미래에 집중한다',
+      'zh-tw': '關注未來',
+    },
   },
   {
     id: 16,
     dimension: 'SN',
-    title: { en: 'In a group, do you tend to...', zh: '在群体中，你倾向于...', ja: 'グループの中では？', ko: '그룹에서 당신은...', 'zh-tw': '在群體中，你傾向於...' },
-    leftTrait: { en: 'Fits in', zh: '融入群体', ja: '周りに溶け込む', ko: '어울린다', 'zh-tw': '融入群體' },
-    rightTrait: { en: 'Stands out', zh: '与众不同', ja: '目立つほう', ko: '눈에 띈다', 'zh-tw': '與眾不同' },
+    title: {
+      en: 'In a group, do you tend to...',
+      zh: '在群体中，你倾向于...',
+      ja: 'グループの中では？',
+      ko: '그룹에서 당신은...',
+      'zh-tw': '在群體中，你傾向於...',
+    },
+    leftTrait: {
+      en: 'Fits in',
+      zh: '融入群体',
+      ja: '周りに溶け込む',
+      ko: '어울린다',
+      'zh-tw': '融入群體',
+    },
+    rightTrait: {
+      en: 'Stands out',
+      zh: '与众不同',
+      ja: '目立つほう',
+      ko: '눈에 띈다',
+      'zh-tw': '與眾不同',
+    },
   },
   {
     id: 20,
     dimension: 'SN',
-    title: { en: 'When telling a story, do you...', zh: '讲故事时，你会...', ja: '出来事を話すときは？', ko: '이야기할 때 당신은...', 'zh-tw': '講故事時，你會...' },
-    leftTrait: { en: 'Describes what happened', zh: '描述发生了什么', ja: '何が起きたかを話す', ko: '무슨 일이 있었는지 설명한다', 'zh-tw': '描述發生了什麼' },
-    rightTrait: { en: 'Describes what it meant', zh: '描述这意味着什么', ja: 'それにどんな意味があったかを話す', ko: '그것이 무엇을 의미하는지 설명한다', 'zh-tw': '描述這意味著什麼' },
+    title: {
+      en: 'When telling a story, do you...',
+      zh: '讲故事时，你会...',
+      ja: '出来事を話すときは？',
+      ko: '이야기할 때 당신은...',
+      'zh-tw': '講故事時，你會...',
+    },
+    leftTrait: {
+      en: 'Describes what happened',
+      zh: '描述发生了什么',
+      ja: '何が起きたかを話す',
+      ko: '무슨 일이 있었는지 설명한다',
+      'zh-tw': '描述發生了什麼',
+    },
+    rightTrait: {
+      en: 'Describes what it meant',
+      zh: '描述这意味着什么',
+      ja: 'それにどんな意味があったかを話す',
+      ko: '그것이 무엇을 의미하는지 설명한다',
+      'zh-tw': '描述這意味著什麼',
+    },
   },
   {
     id: 24,
     dimension: 'SN',
-    title: { en: 'When learning something new, what do you want?', zh: '学习新事物时，你想要什么？', ja: '新しいことを学ぶときは？', ko: '새로운 것을 배울 때 무엇을 원하나요?', 'zh-tw': '學習新事物時，你想要什麼？' },
-    leftTrait: { en: 'Wants the details', zh: '想要细节', ja: 'まず細かい点を知りたい', ko: '세부사항을 원한다', 'zh-tw': '想要細節' },
-    rightTrait: { en: 'Wants the big picture', zh: '想要大局观', ja: 'まず全体像をつかみたい', ko: '큰 그림을 원한다', 'zh-tw': '想要大局觀' },
+    title: {
+      en: 'When learning something new, what do you want?',
+      zh: '学习新事物时，你想要什么？',
+      ja: '新しいことを学ぶときは？',
+      ko: '새로운 것을 배울 때 무엇을 원하나요?',
+      'zh-tw': '學習新事物時，你想要什麼？',
+    },
+    leftTrait: {
+      en: 'Wants the details',
+      zh: '想要细节',
+      ja: 'まず細かい点を知りたい',
+      ko: '세부사항을 원한다',
+      'zh-tw': '想要細節',
+    },
+    rightTrait: {
+      en: 'Wants the big picture',
+      zh: '想要大局观',
+      ja: 'まず全体像をつかみたい',
+      ko: '큰 그림을 원한다',
+      'zh-tw': '想要大局觀',
+    },
   },
   {
     id: 28,
     dimension: 'SN',
-    title: { en: 'How do you approach knowledge?', zh: '你如何获取知识？', ja: '知識の身につけ方は？', ko: '지식에 어떻게 접근하나요?', 'zh-tw': '你如何獲取知識？' },
-    leftTrait: { en: 'Empirical', zh: '经验主义', ja: '経験や実例から', ko: '경험주의적이다', 'zh-tw': '經驗主義' },
-    rightTrait: { en: 'Theoretical', zh: '理论主义', ja: '理論や原理から', ko: '이론적이다', 'zh-tw': '理論主義' },
+    title: {
+      en: 'How do you approach knowledge?',
+      zh: '你如何获取知识？',
+      ja: '知識の身につけ方は？',
+      ko: '지식에 어떻게 접근하나요?',
+      'zh-tw': '你如何獲取知識？',
+    },
+    leftTrait: {
+      en: 'Empirical',
+      zh: '经验主义',
+      ja: '経験や実例から',
+      ko: '경험주의적이다',
+      'zh-tw': '經驗主義',
+    },
+    rightTrait: {
+      en: 'Theoretical',
+      zh: '理论主义',
+      ja: '理論や原理から',
+      ko: '이론적이다',
+      'zh-tw': '理論主義',
+    },
   },
   {
     id: 32,
     dimension: 'SN',
-    title: { en: 'What questions interest you most?', zh: '什么问题最让你感兴趣？', ja: '気になるのは？', ko: '어떤 질문에 가장 관심이 있나요?', 'zh-tw': '什麼問題最讓你感興趣？' },
-    leftTrait: { en: 'Likes to know "who/what/when"', zh: '想知道"谁/什么/何时"', ja: '「誰が・何を・いつ」', ko: '"누가/무엇을/언제"를 알고 싶다', 'zh-tw': '想知道「誰/什麼/何時」' },
-    rightTrait: { en: 'Likes to know "why"', zh: '想知道"为什么"', ja: '「なぜ」', ko: '"왜"를 알고 싶다', 'zh-tw': '想知道「為什麼」' },
+    title: {
+      en: 'What questions interest you most?',
+      zh: '什么问题最让你感兴趣？',
+      ja: '気になるのは？',
+      ko: '어떤 질문에 가장 관심이 있나요?',
+      'zh-tw': '什麼問題最讓你感興趣？',
+    },
+    leftTrait: {
+      en: 'Likes to know "who/what/when"',
+      zh: '想知道"谁/什么/何时"',
+      ja: '「誰が・何を・いつ」',
+      ko: '"누가/무엇을/언제"를 알고 싶다',
+      'zh-tw': '想知道「誰/什麼/何時」',
+    },
+    rightTrait: {
+      en: 'Likes to know "why"',
+      zh: '想知道"为什么"',
+      ja: '「なぜ」',
+      ko: '"왜"를 알고 싶다',
+      'zh-tw': '想知道「為什麼」',
+    },
   },
 ];
 
@@ -276,15 +846,17 @@ export const QUESTIONS_PER_DIMENSION = 8;
  * Quick Test Mode - 8 most discriminating questions (2 per dimension)
  * Selected for clarity and strong differentiation between types
  */
-export const quickTestQuestionIds: Record<string, number[]> = {
-  EI: [3, 15],   // "Needs time alone" & "Gets worn out by parties" - clear E/I indicators
-  SN: [24, 32],  // "Details vs big picture" & "who/what/when vs why" - clear S/N indicators
-  TF: [22, 14],  // "Heart vs head" & "love vs respect" - clear T/F indicators
-  JP: [9, 13],   // "Organized vs chaotic" & "plans ahead vs last minute" - clear J/P indicators
+export const quickTestQuestionIds: DimensionQuestions = {
+  EI: [3, 15], // "Needs time alone" & "Gets worn out by parties" - clear E/I indicators
+  SN: [24, 32], // "Details vs big picture" & "who/what/when vs why" - clear S/N indicators
+  TF: [22, 14], // "Heart vs head" & "love vs respect" - clear T/F indicators
+  JP: [9, 13], // "Organized vs chaotic" & "plans ahead vs last minute" - clear J/P indicators
 } as const;
 
 // Flat list of quick test question IDs (sorted by ID for consistent presentation)
-export const quickTestQuestions = Object.values(quickTestQuestionIds).flat().sort((a, b) => a - b);
+export const quickTestQuestions = Object.values(quickTestQuestionIds)
+  .flat()
+  .sort((a, b) => a - b);
 
 // Quick test totals
 export const QUICK_TEST_TOTAL = 8;
diff --git a/src/quickScoring.test.ts b/src/quickScoring.test.ts
index 365ecd5..57c9eb0 100644
--- a/src/quickScoring.test.ts
+++ b/src/quickScoring.test.ts
@@ -5,17 +5,19 @@ import {
   calculateQuickPercentages,
   generateQuickResult,
   isQuickTestComplete,
-} from './scoring';
-import type { TestAnswers, DimensionScores } from './types';
-import { quickTestQuestionIds, QUICK_TEST_TOTAL } from './questions';
+} from './scoring.js';
+import type { TestAnswers, DimensionScores } from './types.js';
+import { quickTestQuestionIds, QUICK_TEST_TOTAL } from './questions.js';
 
 describe('calculateQuickScores', () => {
   it('returns minimum scores (2) when all answers are 1', () => {
     const answers: TestAnswers = {};
     // Quick test uses questions: EI[3,15], SN[24,32], TF[22,14], JP[9,13]
-    Object.values(quickTestQuestionIds).flat().forEach((id) => {
-      answers[id] = 1;
-    });
+    Object.values(quickTestQuestionIds)
+      .flat()
+      .forEach((id) => {
+        answers[id] = 1;
+      });
     const scores = calculateQuickScores(answers);
     expect(scores.EI).toBe(2);
     expect(scores.SN).toBe(2);
@@ -25,9 +27,11 @@ describe('calculateQuickScores', () => {
 
   it('returns maximum scores (10) when all answers are 5', () => {
     const answers: TestAnswers = {};
-    Object.values(quickTestQuestionIds).flat().forEach((id) => {
-      answers[id] = 5;
-    });
+    Object.values(quickTestQuestionIds)
+      .flat()
+      .forEach((id) => {
+        answers[id] = 5;
+      });
     const scores = calculateQuickScores(answers);
     expect(scores.EI).toBe(10);
     expect(scores.SN).toBe(10);
@@ -37,9 +41,11 @@ describe('calculateQuickScores', () => {
 
   it('returns neutral scores (6) when all answers are 3', () => {
     const answers: TestAnswers = {};
-    Object.values(quickTestQuestionIds).flat().forEach((id) => {
-      answers[id] = 3;
-    });
+    Object.values(quickTestQuestionIds)
+      .flat()
+      .forEach((id) => {
+        answers[id] = 3;
+      });
     const scores = calculateQuickScores(answers);
     expect(scores.EI).toBe(6);
     expect(scores.SN).toBe(6);
@@ -77,10 +83,10 @@ describe('calculateQuickScores', () => {
     });
 
     const scores = calculateQuickScores(answers);
-    expect(scores.EI).toBe(2);  // 2 * 1 = 2
+    expect(scores.EI).toBe(2); // 2 * 1 = 2
     expect(scores.SN).toBe(10); // 2 * 5 = 10
-    expect(scores.TF).toBe(4);  // 2 * 2 = 4
-    expect(scores.JP).toBe(8);  // 2 * 4 = 8
+    expect(scores.TF).toBe(4); // 2 * 2 = 4
+    expect(scores.JP).toBe(8); // 2 * 4 = 8
   });
 
   it('only uses quick test question IDs', () => {
@@ -90,9 +96,11 @@ describe('calculateQuickScores', () => {
       answers[i] = 5;
     }
     // Override quick test questions with 1
-    Object.values(quickTestQuestionIds).flat().forEach((id) => {
-      answers[id] = 1;
-    });
+    Object.values(quickTestQuestionIds)
+      .flat()
+      .forEach((id) => {
+        answers[id] = 1;
+      });
 
     const scores = calculateQuickScores(answers);
     // Should only use quick test questions (answered 1)
@@ -214,9 +222,11 @@ describe('calculateQuickPercentages', () => {
 describe('generateQuickResult', () => {
   it('generates complete result with all components', () => {
     const answers: TestAnswers = {};
-    Object.values(quickTestQuestionIds).flat().forEach((id) => {
-      answers[id] = 3;
-    });
+    Object.values(quickTestQuestionIds)
+      .flat()
+      .forEach((id) => {
+        answers[id] = 3;
+      });
     const result = generateQuickResult(answers);
     expect(result).toHaveProperty('type');
     expect(result).toHaveProperty('scores');
@@ -225,9 +235,11 @@ describe('generateQuickResult', () => {
 
   it('type matches scores correctly', () => {
     const answers: TestAnswers = {};
-    Object.values(quickTestQuestionIds).flat().forEach((id) => {
-      answers[id] = 5;
-    });
+    Object.values(quickTestQuestionIds)
+      .flat()
+      .forEach((id) => {
+        answers[id] = 5;
+      });
     const result = generateQuickResult(answers);
     expect(result.type).toBe('INTP');
     expect(result.scores.EI).toBe(10);
@@ -238,9 +250,11 @@ describe('generateQuickResult', () => {
 
   it('percentages match scores correctly', () => {
     const answers: TestAnswers = {};
-    Object.values(quickTestQuestionIds).flat().forEach((id) => {
-      answers[id] = 1;
-    });
+    Object.values(quickTestQuestionIds)
+      .flat()
+      .forEach((id) => {
+        answers[id] = 1;
+      });
     const result = generateQuickResult(answers);
     expect(result.percentages.E).toBe(100);
     expect(result.percentages.I).toBe(0);
@@ -249,33 +263,49 @@ describe('generateQuickResult', () => {
   it('handles real-world ENFP answers', () => {
     // ENFP: E (low EI), N (high SN), F (low TF), P (high JP)
     const answers: TestAnswers = {};
-    quickTestQuestionIds.EI.forEach((id) => { answers[id] = 2; }); // Low = E
-    quickTestQuestionIds.SN.forEach((id) => { answers[id] = 4; }); // High = N
-    quickTestQuestionIds.TF.forEach((id) => { answers[id] = 2; }); // Low = F
-    quickTestQuestionIds.JP.forEach((id) => { answers[id] = 4; }); // High = P
+    quickTestQuestionIds.EI.forEach((id) => {
+      answers[id] = 2;
+    }); // Low = E
+    quickTestQuestionIds.SN.forEach((id) => {
+      answers[id] = 4;
+    }); // High = N
+    quickTestQuestionIds.TF.forEach((id) => {
+      answers[id] = 2;
+    }); // Low = F
+    quickTestQuestionIds.JP.forEach((id) => {
+      answers[id] = 4;
+    }); // High = P
 
     const result = generateQuickResult(answers);
     expect(result.type).toBe('ENFP');
-    expect(result.scores.EI).toBe(4);  // E preference
-    expect(result.scores.SN).toBe(8);  // N preference
-    expect(result.scores.TF).toBe(4);  // F preference
-    expect(result.scores.JP).toBe(8);  // P preference
+    expect(result.scores.EI).toBe(4); // E preference
+    expect(result.scores.SN).toBe(8); // N preference
+    expect(result.scores.TF).toBe(4); // F preference
+    expect(result.scores.JP).toBe(8); // P preference
   });
 
   it('handles real-world ISTJ answers', () => {
     // ISTJ: I (high EI), S (low SN), T (high TF), J (low JP)
     const answers: TestAnswers = {};
-    quickTestQuestionIds.EI.forEach((id) => { answers[id] = 4; }); // High = I
-    quickTestQuestionIds.SN.forEach((id) => { answers[id] = 2; }); // Low = S
-    quickTestQuestionIds.TF.forEach((id) => { answers[id] = 4; }); // High = T
-    quickTestQuestionIds.JP.forEach((id) => { answers[id] = 2; }); // Low = J
+    quickTestQuestionIds.EI.forEach((id) => {
+      answers[id] = 4;
+    }); // High = I
+    quickTestQuestionIds.SN.forEach((id) => {
+      answers[id] = 2;
+    }); // Low = S
+    quickTestQuestionIds.TF.forEach((id) => {
+      answers[id] = 4;
+    }); // High = T
+    quickTestQuestionIds.JP.forEach((id) => {
+      answers[id] = 2;
+    }); // Low = J
 
     const result = generateQuickResult(answers);
     expect(result.type).toBe('ISTJ');
-    expect(result.scores.EI).toBe(8);  // I preference
-    expect(result.scores.SN).toBe(4);  // S preference
-    expect(result.scores.TF).toBe(8);  // T preference
-    expect(result.scores.JP).toBe(4);  // J preference
+    expect(result.scores.EI).toBe(8); // I preference
+    expect(result.scores.SN).toBe(4); // S preference
+    expect(result.scores.TF).toBe(8); // T preference
+    expect(result.scores.JP).toBe(4); // J preference
   });
 });
 
@@ -291,9 +321,11 @@ describe('isQuickTestComplete', () => {
 
   it('returns true for exactly 8 answers', () => {
     const answers: TestAnswers = {};
-    Object.values(quickTestQuestionIds).flat().forEach((id) => {
-      answers[id] = 3;
-    });
+    Object.values(quickTestQuestionIds)
+      .flat()
+      .forEach((id) => {
+        answers[id] = 3;
+      });
     expect(isQuickTestComplete(answers)).toBe(true);
     expect(Object.keys(answers).length).toBe(QUICK_TEST_TOTAL);
   });
diff --git a/src/scale.ts b/src/scale.ts
new file mode 100644
index 0000000..eaabcdb
--- /dev/null
+++ b/src/scale.ts
@@ -0,0 +1,112 @@
+/**
+ * Shared scoring engine for every bipolar Likert scale in this package.
+ *
+ * The full OEJTS test, the quick test, single-dimension tests and the PurrJung
+ * cat test all follow the same pattern: a set of question IDs per dimension,
+ * answers from 1 (left trait) to 5 (right trait), a score range derived from
+ * the question count, and a midpoint threshold that decides the pole letter.
+ * Only the question IDs, the range and the pole letters differ.
+ *
+ * This module is internal. The public API lives in `scoring.ts` and
+ * `purrjungScoring.ts`.
+ */
+import type {
+  Dimension,
+  DimensionPercentages,
+  DimensionQuestions,
+  DimensionScores,
+  TestAnswers,
+} from './types.js';
+
+/** The four Jungian dimensions, in canonical type-string order. */
+export const DIMENSIONS: readonly Dimension[] = ['EI', 'SN', 'TF', 'JP'];
+
+/** Answer value used in place of an unanswered question. */
+export const NEUTRAL_ANSWER = 3;
+
+/** Pole letters for each dimension: `[left, right]` = `[low score, high score]`. */
+export type DimensionPoles = Readonly<Record<Dimension, readonly [left: string, right: string]>>;
+
+/** Everything the engine needs to score one kind of test. */
+export interface ScaleSpec {
+  /** Question IDs grouped by dimension. */
+  readonly questionIds: DimensionQuestions;
+  /** Lowest possible dimension score (question count × 1). */
+  readonly min: number;
+  /** Highest possible dimension score (question count × 5). */
+  readonly max: number;
+  /** Scores strictly above this value resolve to the right pole. */
+  readonly threshold: number;
+  /** Pole letters per dimension. */
+  readonly poles: DimensionPoles;
+}
+
+/** Sum the answers for a list of question IDs, treating missing answers as neutral. */
+export function sumAnswers(answers: TestAnswers, questionIds: readonly number[]): number {
+  let sum = 0;
+  for (const id of questionIds) {
+    sum += answers[id] ?? NEUTRAL_ANSWER;
+  }
+  return sum;
+}
+
+/** Sum answers for every dimension. */
+export function sumDimensions(
+  answers: TestAnswers,
+  questionIds: DimensionQuestions
+): DimensionScores {
+  return {
+    EI: sumAnswers(answers, questionIds.EI),
+    SN: sumAnswers(answers, questionIds.SN),
+    TF: sumAnswers(answers, questionIds.TF),
+    JP: sumAnswers(answers, questionIds.JP),
+  };
+}
+
+/** Pick the pole letter for one dimension score. */
+export function poleForScore(
+  score: number,
+  threshold: number,
+  poles: readonly [left: string, right: string]
+): string {
+  return score > threshold ? poles[1] : poles[0];
+}
+
+/** Build the four-letter type string from dimension scores. */
+export function scoresToType(
+  scores: DimensionScores,
+  threshold: number,
+  poles: DimensionPoles
+): string {
+  return DIMENSIONS.map((dim) => poleForScore(scores[dim], threshold, poles[dim])).join('');
+}
+
+/**
+ * Map a raw score onto 0–100, where `min` → 0 and `max` → 100.
+ * The result is the share of the right pole; the left pole is `100 - result`.
+ */
+export function toRightPercentage(score: number, min: number, max: number): number {
+  return Math.round(((score - min) / (max - min)) * 100);
+}
+
+/** Split every dimension score into a percentage for each of its two poles. */
+export function scoresToPercentages(
+  scores: DimensionScores,
+  min: number,
+  max: number,
+  poles: DimensionPoles
+): DimensionPercentages {
+  const percentages: Record<string, number> = {};
+  for (const dim of DIMENSIONS) {
+    const right = toRightPercentage(scores[dim], min, max);
+    const [leftPole, rightPole] = poles[dim];
+    percentages[leftPole] = 100 - right;
+    percentages[rightPole] = right;
+  }
+  return percentages as unknown as DimensionPercentages;
+}
+
+/** True when every question in the list has an answer. */
+export function hasAllAnswers(answers: TestAnswers, questionIds: readonly number[]): boolean {
+  return questionIds.every((id) => answers[id] !== undefined);
+}
diff --git a/src/scoring.test.ts b/src/scoring.test.ts
index 44935b0..d628d25 100644
--- a/src/scoring.test.ts
+++ b/src/scoring.test.ts
@@ -23,9 +23,9 @@ import {
   checkDimensionConsistency,
   checkTestConsistency,
   getConfidenceLabel,
-} from './scoring';
-import type { TestAnswers, DimensionScores, Dimension, ConfidenceLevel } from './types';
-import { dimensionQuestions, TOTAL_QUESTIONS } from './questions';
+} from './scoring.js';
+import type { TestAnswers, DimensionScores, Dimension } from './types.js';
+import { dimensionQuestions, TOTAL_QUESTIONS } from './questions.js';
 
 describe('calculateScores', () => {
   it('returns minimum scores (8) when all answers are 1', () => {
diff --git a/src/scoring.ts b/src/scoring.ts
index f6821d6..772d9f4 100644
--- a/src/scoring.ts
+++ b/src/scoring.ts
@@ -1,4 +1,21 @@
-import { dimensionQuestions, TOTAL_QUESTIONS, quickTestQuestionIds, QUICK_TEST_TOTAL, QUICK_TEST_PER_DIMENSION } from './questions';
+import {
+  dimensionQuestions,
+  TOTAL_QUESTIONS,
+  quickTestQuestionIds,
+  QUICK_TEST_TOTAL,
+} from './questions.js';
+import {
+  DIMENSIONS,
+  NEUTRAL_ANSWER,
+  hasAllAnswers,
+  poleForScore,
+  scoresToPercentages,
+  scoresToType,
+  sumAnswers,
+  sumDimensions,
+  toRightPercentage,
+  type DimensionPoles,
+} from './scale.js';
 import type {
   TestAnswers,
   DimensionScores,
@@ -11,24 +28,45 @@ import type {
   TestConfidence,
   ConsistencyResult,
   TestConsistency,
-} from './types';
+} from './types.js';
+
+/**
+ * Pole letters for the human OEJTS test.
+ * Low scores (left traits) map to the first letter, high scores (right traits) to the second.
+ *
+ * - EI: E ↔ I
+ * - SN: S ↔ N
+ * - TF: F ↔ T (note the order: low = Feeling, high = Thinking)
+ * - JP: J ↔ P
+ */
+const OEJTS_POLES: DimensionPoles = {
+  EI: ['E', 'I'],
+  SN: ['S', 'N'],
+  TF: ['F', 'T'],
+  JP: ['J', 'P'],
+};
+
+// ============================================
+// Full Test (32 questions, 8 per dimension)
+// ============================================
+
+/** Number of questions per dimension */
+export const DIMENSION_QUESTIONS_COUNT = 8;
+
+/** Score range for one dimension of the full test: 8-40 */
+export const DIMENSION_SCORE_MIN = 8;
+export const DIMENSION_SCORE_MAX = 40;
+/** Midpoint of the 8-40 range; scores above it resolve to the right pole */
+export const DIMENSION_THRESHOLD = 24;
 
 /**
  * Calculate dimension scores from test answers
  * Each dimension has 8 questions scored 1-5
  * Total range per dimension: 8-40
+ * Unanswered questions count as neutral (3).
  */
 export function calculateScores(answers: TestAnswers): DimensionScores {
-  const scores: DimensionScores = { EI: 0, SN: 0, TF: 0, JP: 0 };
-
-  for (const [dimension, questionIds] of Object.entries(dimensionQuestions)) {
-    scores[dimension as keyof DimensionScores] = questionIds.reduce(
-      (sum, qId) => sum + (answers[qId] ?? 3), // Default to neutral (3) if missing
-      0
-    );
-  }
-
-  return scores;
+  return sumDimensions(answers, dimensionQuestions);
 }
 
 /**
@@ -45,14 +83,7 @@ export function calculateScores(answers: TestAnswers): DimensionScores {
  *       Left traits are J-oriented, right traits are P-oriented
  */
 export function determineType(scores: DimensionScores): string {
-  const threshold = 24;
-
-  const e_i = scores.EI > threshold ? 'I' : 'E';
-  const s_n = scores.SN > threshold ? 'N' : 'S';
-  const t_f = scores.TF > threshold ? 'T' : 'F';
-  const j_p = scores.JP > threshold ? 'P' : 'J';
-
-  return `${e_i}${s_n}${t_f}${j_p}`;
+  return scoresToType(scores, DIMENSION_THRESHOLD, OEJTS_POLES);
 }
 
 /**
@@ -60,28 +91,7 @@ export function determineType(scores: DimensionScores): string {
  * Converts raw scores (8-40) to percentages (0-100)
  */
 export function calculatePercentages(scores: DimensionScores): DimensionPercentages {
-  const toRightPercentage = (score: number): number => {
-    // Convert 8-40 range to 0-100
-    // Score 8 = 0% right, Score 40 = 100% right
-    const normalized = ((score - 8) / 32) * 100;
-    return Math.round(normalized);
-  };
-
-  const eiRight = toRightPercentage(scores.EI); // I percentage
-  const snRight = toRightPercentage(scores.SN); // N percentage
-  const tfRight = toRightPercentage(scores.TF); // T percentage
-  const jpRight = toRightPercentage(scores.JP); // P percentage
-
-  return {
-    E: 100 - eiRight,
-    I: eiRight,
-    S: 100 - snRight,
-    N: snRight,
-    F: 100 - tfRight,
-    T: tfRight,
-    J: 100 - jpRight,
-    P: jpRight,
-  };
+  return scoresToPercentages(scores, DIMENSION_SCORE_MIN, DIMENSION_SCORE_MAX, OEJTS_POLES);
 }
 
 /**
@@ -96,32 +106,35 @@ export function generateResult(answers: TestAnswers): TestResult {
 }
 
 /**
- * Validate if all questions are answered
+ * Check whether the expected number of questions has been answered.
+ *
+ * This is a count check only: it does not verify which IDs are present or that
+ * values fall within 1-5. Use `isDimensionTestComplete` for ID-level checks.
  */
-export function isTestComplete(answers: TestAnswers, totalQuestions: number = TOTAL_QUESTIONS): boolean {
+export function isTestComplete(
+  answers: TestAnswers,
+  totalQuestions: number = TOTAL_QUESTIONS
+): boolean {
   return Object.keys(answers).length === totalQuestions;
 }
 
 // ============================================
-// Quick Test Mode Functions (8 questions)
+// Quick Test Mode (8 questions, 2 per dimension)
 // ============================================
 
+/** Score range for one dimension of the quick test: 2-10 */
+const QUICK_SCORE_MIN = 2;
+const QUICK_SCORE_MAX = 10;
+/** Midpoint of the 2-10 range */
+const QUICK_THRESHOLD = 6;
+
 /**
  * Calculate dimension scores from quick test answers
  * Each dimension has 2 questions scored 1-5
  * Total range per dimension: 2-10
  */
 export function calculateQuickScores(answers: TestAnswers): DimensionScores {
-  const scores: DimensionScores = { EI: 0, SN: 0, TF: 0, JP: 0 };
-
-  for (const [dimension, questionIds] of Object.entries(quickTestQuestionIds)) {
-    scores[dimension as keyof DimensionScores] = questionIds.reduce(
-      (sum, qId) => sum + (answers[qId] ?? 3), // Default to neutral (3) if missing
-      0
-    );
-  }
-
-  return scores;
+  return sumDimensions(answers, quickTestQuestionIds);
 }
 
 /**
@@ -129,14 +142,7 @@ export function calculateQuickScores(answers: TestAnswers): DimensionScores {
  * Threshold adjusted for 2-10 range (midpoint = 6)
  */
 export function determineQuickType(scores: DimensionScores): string {
-  const threshold = 6; // Midpoint of 2-10 range
-
-  const e_i = scores.EI > threshold ? 'I' : 'E';
-  const s_n = scores.SN > threshold ? 'N' : 'S';
-  const t_f = scores.TF > threshold ? 'T' : 'F';
-  const j_p = scores.JP > threshold ? 'P' : 'J';
-
-  return `${e_i}${s_n}${t_f}${j_p}`;
+  return scoresToType(scores, QUICK_THRESHOLD, OEJTS_POLES);
 }
 
 /**
@@ -144,28 +150,7 @@ export function determineQuickType(scores: DimensionScores): string {
  * Converts raw scores (2-10) to percentages (0-100)
  */
 export function calculateQuickPercentages(scores: DimensionScores): DimensionPercentages {
-  const toRightPercentage = (score: number): number => {
-    // Convert 2-10 range to 0-100
-    // Score 2 = 0% right, Score 10 = 100% right
-    const normalized = ((score - 2) / 8) * 100;
-    return Math.round(normalized);
-  };
-
-  const eiRight = toRightPercentage(scores.EI); // I percentage
-  const snRight = toRightPercentage(scores.SN); // N percentage
-  const tfRight = toRightPercentage(scores.TF); // T percentage
-  const jpRight = toRightPercentage(scores.JP); // P percentage
-
-  return {
-    E: 100 - eiRight,
-    I: eiRight,
-    S: 100 - snRight,
-    N: snRight,
-    F: 100 - tfRight,
-    T: tfRight,
-    J: 100 - jpRight,
-    P: jpRight,
-  };
+  return scoresToPercentages(scores, QUICK_SCORE_MIN, QUICK_SCORE_MAX, OEJTS_POLES);
 }
 
 /**
@@ -180,35 +165,16 @@ export function generateQuickResult(answers: TestAnswers): TestResult {
 }
 
 /**
- * Validate if all quick test questions are answered
+ * Check whether exactly 8 answers have been recorded (count check only).
  */
 export function isQuickTestComplete(answers: TestAnswers): boolean {
   return Object.keys(answers).length === QUICK_TEST_TOTAL;
 }
 
 // ============================================
-// Single Dimension Test Functions (8 questions)
+// Single Dimension Test (8 questions)
 // ============================================
 
-/** Number of questions per dimension */
-export const DIMENSION_QUESTIONS_COUNT = 8;
-
-/** Score range for single dimension: 8-40 */
-export const DIMENSION_SCORE_MIN = 8;
-export const DIMENSION_SCORE_MAX = 40;
-export const DIMENSION_THRESHOLD = 24; // Midpoint
-
-/**
- * Dimension preference mapping
- * Left preference (low score) -> Right preference (high score)
- */
-const dimensionPreferences: Record<Dimension, { left: string; right: string }> = {
-  EI: { left: 'E', right: 'I' },
-  SN: { left: 'S', right: 'N' },
-  TF: { left: 'F', right: 'T' },
-  JP: { left: 'J', right: 'P' },
-};
-
 /**
  * Calculate single dimension score from test answers
  * @param answers - TestAnswers with dimension questions answered
@@ -216,11 +182,7 @@ const dimensionPreferences: Record<Dimension, { left: string; right: string }> =
  * @returns Score in 8-40 range
  */
 export function calculateDimensionScore(answers: TestAnswers, dimension: Dimension): number {
-  const questionIds = dimensionQuestions[dimension];
-  return questionIds.reduce(
-    (sum, qId) => sum + (answers[qId] ?? 3), // Default to neutral (3) if missing
-    0
-  );
+  return sumAnswers(answers, dimensionQuestions[dimension]);
 }
 
 /**
@@ -230,8 +192,7 @@ export function calculateDimensionScore(answers: TestAnswers, dimension: Dimensi
  * @returns Preference letter (E/I, S/N, F/T, J/P)
  */
 export function determineDimensionPreference(score: number, dimension: Dimension): string {
-  const prefs = dimensionPreferences[dimension];
-  return score > DIMENSION_THRESHOLD ? prefs.right : prefs.left;
+  return poleForScore(score, DIMENSION_THRESHOLD, OEJTS_POLES[dimension]);
 }
 
 /**
@@ -240,12 +201,8 @@ export function determineDimensionPreference(score: number, dimension: Dimension
  * @returns Object with left and right percentages (total = 100)
  */
 export function calculateDimensionPercentages(score: number): { left: number; right: number } {
-  // Convert 8-40 range to 0-100 (right percentage)
-  const rightPercent = Math.round(((score - DIMENSION_SCORE_MIN) / (DIMENSION_SCORE_MAX - DIMENSION_SCORE_MIN)) * 100);
-  return {
-    left: 100 - rightPercent,
-    right: rightPercent,
-  };
+  const right = toRightPercentage(score, DIMENSION_SCORE_MIN, DIMENSION_SCORE_MAX);
+  return { left: 100 - right, right };
 }
 
 /**
@@ -254,7 +211,10 @@ export function calculateDimensionPercentages(score: number): { left: number; ri
  * @param dimension - Target dimension
  * @returns SingleDimensionResult with score, preference, and percentages
  */
-export function generateDimensionResult(answers: TestAnswers, dimension: Dimension): SingleDimensionResult {
+export function generateDimensionResult(
+  answers: TestAnswers,
+  dimension: Dimension
+): SingleDimensionResult {
   const score = calculateDimensionScore(answers, dimension);
   const preference = determineDimensionPreference(score, dimension);
   const { left, right } = calculateDimensionPercentages(score);
@@ -275,8 +235,7 @@ export function generateDimensionResult(answers: TestAnswers, dimension: Dimensi
  * @returns True if all 8 questions for the dimension are answered
  */
 export function isDimensionTestComplete(answers: TestAnswers, dimension: Dimension): boolean {
-  const questionIds = dimensionQuestions[dimension];
-  return questionIds.every(qId => answers[qId] !== undefined);
+  return hasAllAnswers(answers, dimensionQuestions[dimension]);
 }
 
 /**
@@ -289,7 +248,7 @@ export function getDimensionQuestionIds(dimension: Dimension): readonly number[]
 }
 
 // ============================================
-// Test Quality Metrics Functions
+// Test Quality Metrics
 // ============================================
 
 /**
@@ -305,6 +264,9 @@ const CONFIDENCE_THRESHOLDS = {
   slight: 2,
 } as const;
 
+/** Largest possible distance from the midpoint (24 → 8 or 24 → 40). */
+const MAX_DISTANCE = DIMENSION_SCORE_MAX - DIMENSION_THRESHOLD;
+
 /**
  * Calculate confidence level from distance to threshold
  * @param distance - Absolute distance from threshold (0-16)
@@ -323,18 +285,15 @@ export function getConfidenceLevel(distance: number): ConfidenceLevel {
  * @param dimension - The dimension being measured
  * @returns DimensionConfidence with level, distance, and percentage
  */
-export function calculateDimensionConfidence(score: number, dimension: Dimension): DimensionConfidence {
+export function calculateDimensionConfidence(
+  score: number,
+  dimension: Dimension
+): DimensionConfidence {
   const distance = Math.abs(score - DIMENSION_THRESHOLD);
   const level = getConfidenceLevel(distance);
-  // Max distance is 16 (from 24 to 8 or 24 to 40), convert to percentage
-  const percentage = Math.round((distance / 16) * 100);
+  const percentage = Math.round((distance / MAX_DISTANCE) * 100);
 
-  return {
-    dimension,
-    level,
-    distance,
-    percentage,
-  };
+  return { dimension, level, distance, percentage };
 }
 
 /**
@@ -343,27 +302,16 @@ export function calculateDimensionConfidence(score: number, dimension: Dimension
  * @returns TestConfidence with per-dimension confidence and clarity index
  */
 export function calculateTestConfidence(scores: DimensionScores): TestConfidence {
-  const dimensions: Dimension[] = ['EI', 'SN', 'TF', 'JP'];
-  const confidences: Record<string, DimensionConfidence> = {};
-
-  let totalDistance = 0;
-  for (const dim of dimensions) {
-    const confidence = calculateDimensionConfidence(scores[dim], dim);
-    confidences[dim] = confidence;
-    totalDistance += confidence.distance;
-  }
+  const EI = calculateDimensionConfidence(scores.EI, 'EI');
+  const SN = calculateDimensionConfidence(scores.SN, 'SN');
+  const TF = calculateDimensionConfidence(scores.TF, 'TF');
+  const JP = calculateDimensionConfidence(scores.JP, 'JP');
 
-  // Clarity index: average distance normalized to 0-100
-  // Max total distance = 16 * 4 = 64
-  const clarityIndex = Math.round((totalDistance / 64) * 100);
+  // Clarity index: total distance normalized to 0-100 (max = 16 × 4 = 64)
+  const totalDistance = EI.distance + SN.distance + TF.distance + JP.distance;
+  const clarityIndex = Math.round((totalDistance / (MAX_DISTANCE * DIMENSIONS.length)) * 100);
 
-  return {
-    EI: confidences.EI,
-    SN: confidences.SN,
-    TF: confidences.TF,
-    JP: confidences.JP,
-    clarityIndex,
-  };
+  return { EI, SN, TF, JP, clarityIndex };
 }
 
 /**
@@ -373,13 +321,12 @@ export function calculateTestConfidence(scores: DimensionScores): TestConfidence
  * @returns Variance of the 8 answers (0 = all same, higher = more varied)
  */
 function calculateAnswerVariance(answers: TestAnswers, dimension: Dimension): number {
-  const questionIds = dimensionQuestions[dimension];
-  const values = questionIds.map(qId => answers[qId] ?? 3);
+  const values = dimensionQuestions[dimension].map((qId) => answers[qId] ?? NEUTRAL_ANSWER);
 
   if (values.length === 0) return 0;
 
   const mean = values.reduce((a, b) => a + b, 0) / values.length;
-  const squaredDiffs = values.map(v => Math.pow(v - mean, 2));
+  const squaredDiffs = values.map((v) => (v - mean) ** 2);
   return squaredDiffs.reduce((a, b) => a + b, 0) / values.length;
 }
 
@@ -388,21 +335,23 @@ const CONSISTENCY_THRESHOLD = 3;
 
 /**
  * Check consistency of answers within a dimension
- * Flags question pairs where answers differ significantly
+ * Flags adjacent question pairs whose answers differ by 3 or more
  * @param answers - Test answers
  * @param dimension - Target dimension
  * @returns ConsistencyResult with variance and flagged pairs
  */
-export function checkDimensionConsistency(answers: TestAnswers, dimension: Dimension): ConsistencyResult {
+export function checkDimensionConsistency(
+  answers: TestAnswers,
+  dimension: Dimension
+): ConsistencyResult {
   const questionIds = dimensionQuestions[dimension];
   const variance = calculateAnswerVariance(answers, dimension);
   const flaggedPairs: [number, number][] = [];
 
-  // Compare adjacent question pairs within dimension
   for (let i = 0; i < questionIds.length - 1; i++) {
     const q1 = questionIds[i];
     const q2 = questionIds[i + 1];
-    const diff = Math.abs((answers[q1] ?? 3) - (answers[q2] ?? 3));
+    const diff = Math.abs((answers[q1] ?? NEUTRAL_ANSWER) - (answers[q2] ?? NEUTRAL_ANSWER));
     if (diff >= CONSISTENCY_THRESHOLD) {
       flaggedPairs.push([q1, q2]);
     }
@@ -422,26 +371,21 @@ export function checkDimensionConsistency(answers: TestAnswers, dimension: Dimen
  * @returns TestConsistency with per-dimension results and overall status
  */
 export function checkTestConsistency(answers: TestAnswers): TestConsistency {
-  const dimensions: Dimension[] = ['EI', 'SN', 'TF', 'JP'];
-  const results: Record<string, ConsistencyResult> = {};
-  const warnings: string[] = [];
-
-  let allConsistent = true;
-  for (const dim of dimensions) {
-    const result = checkDimensionConsistency(answers, dim);
-    results[dim] = result;
-    if (!result.isConsistent) {
-      allConsistent = false;
-      warnings.push(`Inconsistent answers in ${dim} dimension`);
-    }
-  }
+  const EI = checkDimensionConsistency(answers, 'EI');
+  const SN = checkDimensionConsistency(answers, 'SN');
+  const TF = checkDimensionConsistency(answers, 'TF');
+  const JP = checkDimensionConsistency(answers, 'JP');
+
+  const warnings = [EI, SN, TF, JP]
+    .filter((result) => !result.isConsistent)
+    .map((result) => `Inconsistent answers in ${result.dimension} dimension`);
 
   return {
-    EI: results.EI,
-    SN: results.SN,
-    TF: results.TF,
-    JP: results.JP,
-    overallConsistent: allConsistent,
+    EI,
+    SN,
+    TF,
+    JP,
+    overallConsistent: warnings.length === 0,
     warnings,
   };
 }
diff --git a/src/types.ts b/src/types.ts
index 53d5c63..115d034 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -47,8 +47,12 @@ export interface SingleDimensionResult {
   rightPercent: number; // 0-100
 }
 
-// Multilingual text (en is required, others optional for fallback)
-export interface BilingualText {
+/**
+ * Multilingual text. `en` is always present; every other locale is optional so
+ * consumers can carry partial translations of their own content.
+ * Use `getLocalizedText()` to read a locale with English fallback.
+ */
+export interface MultilingualText {
   [locale: string]: string | undefined;
   en: string;
   zh?: string;
@@ -57,13 +61,16 @@ export interface BilingualText {
   'zh-tw'?: string;
 }
 
+/** @deprecated Use {@link MultilingualText}. Kept as an alias for existing imports. */
+export type BilingualText = MultilingualText;
+
 // Question pair (bipolar scale)
 export interface QuestionPair {
   id: number;
   dimension: Dimension;
-  title?: BilingualText; // Optional question prompt to guide users
-  leftTrait: BilingualText;
-  rightTrait: BilingualText;
+  title?: MultilingualText; // Optional question prompt to guide users
+  leftTrait: MultilingualText;
+  rightTrait: MultilingualText;
 }
 
 // Dimension to question IDs mapping
diff --git a/tsconfig.build.json b/tsconfig.build.json
new file mode 100644
index 0000000..3276af0
--- /dev/null
+++ b/tsconfig.build.json
@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "noEmit": false
+  },
+  "exclude": ["node_modules", "dist", "src/**/*.test.ts"]
+}
diff --git a/tsconfig.json b/tsconfig.json
index 2323cff..6613dc8 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,14 +1,21 @@
 {
   "compilerOptions": {
-    "target": "ES2020",
-    "module": "ESNext",
-    "moduleResolution": "bundler",
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "lib": ["ES2022"],
+    "types": ["node"],
     "declaration": true,
     "declarationMap": true,
     "sourceMap": true,
     "outDir": "./dist",
     "rootDir": "./src",
     "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "verbatimModuleSyntax": true,
+    "isolatedModules": true,
     "esModuleInterop": true,
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true