diff --git a/CHANGELOG.md b/CHANGELOG.md
index c03aab5..615be84 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- UAQ engine `toHijri` was reading local date components (`getFullYear/getMonth/getDate`) instead of UTC components, causing incorrect results on hosts west of UTC (e.g. `America/New_York`, `Pacific/Auckland`) when the input Date was a UTC-midnight value such as those returned by `toGregorian` or ISO date-only strings. `toHijri` now reads UTC calendar day components (`getUTCFullYear/getUTCMonth/getUTCDate`), matching the FCNA engine. **Behavior change:** on non-UTC hosts the converted Hijri day may shift to the UTC calendar day; round-trips via `toGregorian` are now exact on every machine.
+
 ## [1.0.2] - 2026-05-30
 
 ### Changed
diff --git a/README.md b/README.md
index 446a36e..6003500 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,27 @@ isValidHijriDate(1444, 9, 1); // true
 daysInHijriMonth(1444, 9);    // 29
 ```
 
+## Day boundaries and time zones
+
+hijri-core maps civil calendar days one-to-one (tabular UAQ, computed FCNA). The religious Hijri day beginning at sunset is intentionally out of scope.
+
+`toHijri` reads the input Date's UTC calendar day (`getUTCFullYear`, `getUTCMonth`, `getUTCDate`). `toGregorian` returns a UTC-midnight Date. This means round-trips are exact and results are identical on every machine regardless of local time zone:
+
+```typescript
+// Safe on any host — UTC-explicit construction
+const greg = toGregorian(1446, 9, 1);          // 2025-03-01T00:00:00.000Z
+const back = toHijri(greg!);                   // { hy: 1446, hm: 9, hd: 1 } — always exact
+
+// ISO date-only strings parse as UTC midnight — correct
+toHijri(new Date('2025-03-01'));               // { hy: 1446, hm: 9, hd: 1 }
+
+// For a local wall-clock date, construct explicitly in UTC
+toHijri(new Date(Date.UTC(2025, 2, 1)));       // { hy: 1446, hm: 9, hd: 1 }
+
+// Avoid local Date constructor for date-only conversions — breaks on UTC+13
+// toHijri(new Date(2025, 2, 1))  ← do NOT do this
+```
+
 ## Custom Calendars
 
 Implement `CalendarEngine` and call `registerCalendar('my-id', engine)`. Pass `{ calendar: 'my-id' }` to any conversion function.
diff --git a/hijri-core.test.ts b/hijri-core.test.ts
new file mode 100644
index 0000000..51902de
--- /dev/null
+++ b/hijri-core.test.ts
@@ -0,0 +1,140 @@
+/**
+ * Purpose:    Vitest suite for hijri-core — conversion, validation, registry, and name exports.
+ * Inputs:     Pure functions from src/index.ts (no network; module-load registers uaq+fcna engines).
+ * Outputs:    Vitest pass/fail assertions.
+ * Constraints: UAQ calendar covers 1318–1500 AH (≈1900–2076 CE). toHijri interprets the input
+ *             Date by its UTC calendar day (getUTC* components); pass UTC-explicit Dates for
+ *             deterministic results. toGregorian returns UTC midnight, so round-trips are exact.
+ * Usage:      pnpm vitest run
+ * SOT:        packages.md — hijri-core row
+ */
+import { describe, it, expect } from "vitest";
+import {
+  toHijri,
+  toGregorian,
+  isValidHijriDate,
+  daysInHijriMonth,
+  listCalendars,
+  hmLong,
+  hwLong,
+} from "./src/index";
+
+describe("toGregorian (UAQ default)", () => {
+  it("converts 1 Ramadan 1446 to 2025-03-01 UTC midnight", () => {
+    const result = toGregorian(1446, 9, 1);
+    expect(result).not.toBeNull();
+    expect(result!.toISOString()).toBe("2025-03-01T00:00:00.000Z");
+  });
+
+  it("converts 1 Muharram 1446 to 2024-07-07 UTC midnight", () => {
+    const result = toGregorian(1446, 1, 1);
+    expect(result).not.toBeNull();
+    expect(result!.toISOString()).toBe("2024-07-07T00:00:00.000Z");
+  });
+
+  it("returns null for an out-of-range Hijri year (1501)", () => {
+    expect(toGregorian(1501, 1, 1)).toBeNull();
+  });
+});
+
+describe("toHijri (UAQ default)", () => {
+  it("converts 2025-03-01 noon UTC to 1 Ramadan 1446", () => {
+    // toGregorian(1446,9,1) = 2025-03-01 midnight; add 12h to stay on that Gregorian day
+    const noonOnRamadanStart = new Date("2025-03-01T12:00:00Z");
+    const result = toHijri(noonOnRamadanStart);
+    expect(result).not.toBeNull();
+    expect(result!.hy).toBe(1446);
+    expect(result!.hm).toBe(9);
+    expect(result!.hd).toBe(1);
+  });
+
+  it("returns null for a date outside UAQ range (year 2100)", () => {
+    expect(toHijri(new Date("2100-01-01T12:00:00Z"))).toBeNull();
+  });
+
+  it("throws on an invalid Date object", () => {
+    expect(() => toHijri(new Date("invalid"))).toThrow();
+  });
+});
+
+describe("isValidHijriDate", () => {
+  it("accepts a known valid date", () => {
+    expect(isValidHijriDate(1446, 9, 1)).toBe(true);
+  });
+
+  it("rejects month 13", () => {
+    expect(isValidHijriDate(1446, 13, 1)).toBe(false);
+  });
+
+  it("rejects day 0", () => {
+    expect(isValidHijriDate(1446, 1, 0)).toBe(false);
+  });
+});
+
+describe("daysInHijriMonth", () => {
+  it("returns 29 or 30 for a valid month", () => {
+    const days = daysInHijriMonth(1446, 9);
+    expect([29, 30]).toContain(days);
+  });
+});
+
+describe("registry", () => {
+  it("lists at least uaq and fcna after module load", () => {
+    const calendars = listCalendars();
+    expect(calendars).toContain("uaq");
+    expect(calendars).toContain("fcna");
+  });
+});
+
+describe("name tables", () => {
+  it("hmLong has 12 entries and index 8 is Ramadan", () => {
+    expect(hmLong).toHaveLength(12);
+    expect(hmLong[8]).toBe("Ramadan");
+  });
+
+  it("hwLong has 7 weekday entries", () => {
+    expect(hwLong).toHaveLength(7);
+  });
+});
+
+describe("day boundaries (UTC contract)", () => {
+  it("UAQ round-trip: toHijri(toGregorian(1446, 9, 1)) returns {hy:1446, hm:9, hd:1}", () => {
+    const greg = toGregorian(1446, 9, 1);
+    expect(greg).not.toBeNull();
+    const hijri = toHijri(greg!);
+    expect(hijri).not.toBeNull();
+    expect(hijri!.hy).toBe(1446);
+    expect(hijri!.hm).toBe(9);
+    expect(hijri!.hd).toBe(1);
+  });
+
+  it("toHijri(new Date('2025-03-01T00:00:00Z')) = 1 Ramadan 1446", () => {
+    const result = toHijri(new Date("2025-03-01T00:00:00Z"));
+    expect(result).not.toBeNull();
+    expect(result!.hy).toBe(1446);
+    expect(result!.hm).toBe(9);
+    expect(result!.hd).toBe(1);
+  });
+
+  it("last ms of 2025-02-28 UTC maps to the same Hijri day as noon on 2025-02-28 UTC", () => {
+    const lastMs = toHijri(new Date("2025-02-28T23:59:59.999Z"));
+    const noon = toHijri(new Date("2025-02-28T12:00:00Z"));
+    expect(lastMs).not.toBeNull();
+    expect(noon).not.toBeNull();
+    expect(lastMs!.hy).toBe(noon!.hy);
+    expect(lastMs!.hm).toBe(noon!.hm);
+    expect(lastMs!.hd).toBe(noon!.hd);
+    // and it is the day before 1 Ramadan 1446
+    expect(lastMs!.hm).not.toBe(9);
+  });
+
+  it("FCNA round-trip: toHijri(toGregorian(1446, 9, 1, {calendar:'fcna'}), {calendar:'fcna'}) is exact", () => {
+    const greg = toGregorian(1446, 9, 1, { calendar: "fcna" });
+    expect(greg).not.toBeNull();
+    const hijri = toHijri(greg!, { calendar: "fcna" });
+    expect(hijri).not.toBeNull();
+    expect(hijri!.hy).toBe(1446);
+    expect(hijri!.hm).toBe(9);
+    expect(hijri!.hd).toBe(1);
+  });
+});
diff --git a/package.json b/package.json
index aa84fc3..3845a76 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,8 @@
     "format:check": "prettier --check src/",
     "coverage": "c8 --reporter=lcov --reporter=text node test.mjs",
     "docs": "typedoc --out .github/wiki/api src/index.ts",
-    "postbuild": "cp dist/index.d.ts dist/index.d.mts"
+    "postbuild": "cp dist/index.d.ts dist/index.d.mts",
+    "test:vitest": "vitest run"
   },
   "keywords": [
     "hijri",
@@ -70,7 +71,8 @@
     "typedoc": "^0.28.19",
     "typedoc-plugin-markdown": "^4.11.0",
     "typescript": "^5.5.0",
-    "typescript-eslint": "^8.56.1"
+    "typescript-eslint": "^8.56.1",
+    "vitest": "^2.1.9"
   },
   "publishConfig": {
     "access": "public",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index aab7fa8..190925f 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -43,7 +43,7 @@ importers:
         version: 3.8.1
       tsup:
         specifier: ^8.0.0
-        version: 8.5.1(typescript@5.9.3)(yaml@2.9.0)
+        version: 8.5.1(postcss@8.5.15)(typescript@5.9.3)(yaml@2.9.0)
       typedoc:
         specifier: ^0.28.19
         version: 0.28.19(typescript@5.9.3)
@@ -56,6 +56,9 @@ importers:
       typescript-eslint:
         specifier: ^8.56.1
         version: 8.56.1(eslint@10.0.3)(typescript@5.9.3)
+      vitest:
+        specifier: ^2.1.9
+        version: 2.1.9(@types/node@22.15.0)
 
 packages:
 
@@ -89,102 +92,204 @@ packages:
     resolution: {integrity: sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==}
     engines: {node: '>=18'}
 
+  '@esbuild/aix-ppc64@0.21.5':
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+    engines: {node: '>=12'}
+    cpu: [ppc64]
+    os: [aix]
+
   '@esbuild/aix-ppc64@0.27.3':
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     engines: {node: '>=18'}
     cpu: [ppc64]
     os: [aix]
 
+  '@esbuild/android-arm64@0.21.5':
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     engines: {node: '>=18'}
     cpu: [arm64]
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+  '@esbuild/android-arm@0.21.5':
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     engines: {node: '>=18'}
@@ -197,6 +302,12 @@ packages:
     cpu: [arm64]
     os: [netbsd]
 
+  '@esbuild/netbsd-x64@0.21.5':
+    resolution: {integrity: sha512-Woi2MXzXjMULccIwMnLciyZH4nCIMpWQAs049KEeMvOcNADVxo0UBIQPfSmxB3CWKedngg7sWZdLvLczpe0tLg==}
+    engines: {node: '>=12'}
+    cpu: [x64]
+    os: [netbsd]
+
   '@esbuild/netbsd-x64@0.27.3':
     resolution: {integrity: sha512-P14lFKJl/DdaE00LItAukUdZO5iqNH7+PjoBm+fLQjtxfcfFE20Xf5CrLsmZdq5LFFZzb5JMZ9grUwvtVYzjiA==}
     engines: {node: '>=18'}
@@ -209,6 +320,12 @@ packages:
     cpu: [arm64]
     os: [openbsd]
 
+  '@esbuild/openbsd-x64@0.21.5':
+    resolution: {integrity: sha512-HLNNw99xsvx12lFBUwoT8EVCsSvRNDVxNpjZ7bPn947b8gJPzeHWyNVhFsaerc0n3TsbOINvRP2byTZ5LKezow==}
+    engines: {node: '>=12'}
+    cpu: [x64]
+    os: [openbsd]
+
   '@esbuild/openbsd-x64@0.27.3':
     resolution: {integrity: sha512-DnW2sRrBzA+YnE70LKqnM3P+z8vehfJWHXECbwBmH/CU51z6FiqTQTHFenPlHmo3a8UgpLyH3PT+87OViOh1AQ==}
     engines: {node: '>=18'}
@@ -221,24 +338,48 @@ packages:
     cpu: [arm64]
     os: [openharmony]
 
+  '@esbuild/sunos-x64@0.21.5':
+    resolution: {integrity: sha512-6+gjmFpfy0BHU5Tpptkuh8+uw3mnrvgs+dSPQXQOv3ekbordwnzTVEb4qnIvQcYXq6gzkyTnoZ9dZG+D4garKg==}
+    engines: {node: '>=12'}
+    cpu: [x64]
+    os: [sunos]
+
   '@esbuild/sunos-x64@0.27.3':
     resolution: {integrity: sha512-PanZ+nEz+eWoBJ8/f8HKxTTD172SKwdXebZ0ndd953gt1HRBbhMsaNqjTyYLGLPdoWHy4zLU7bDVJztF5f3BHA==}
     engines: {node: '>=18'}
     cpu: [x64]
     os: [sunos]
 
+  '@esbuild/win32-arm64@0.21.5':
+    resolution: {integrity: sha512-Z0gOTd75VvXqyq7nsl93zwahcTROgqvuAcYDUr+vOv8uHhNSKROyU961kgtCD1e95IqPKSQKH7tBTslnS3tA8A==}
+    engines: {node: '>=12'}
+    cpu: [arm64]
+    os: [win32]
+
   '@esbuild/win32-arm64@0.27.3':
     resolution: {integrity: sha512-B2t59lWWYrbRDw/tjiWOuzSsFh1Y/E95ofKz7rIVYSQkUYBjfSgf6oeYPNWHToFRr2zx52JKApIcAS/D5TUBnA==}
     engines: {node: '>=18'}
     cpu: [arm64]
     os: [win32]
 
+  '@esbuild/win32-ia32@0.21.5':
+    resolution: {integrity: sha512-SWXFF1CL2RVNMaVs+BBClwtfZSvDgtL//G/smwAc5oVK/UPu2Gu9tIaRgFmYFFKrmg3SyAjSrElf0TiJ1v8fYA==}
+    engines: {node: '>=12'}
+    cpu: [ia32]
+    os: [win32]
+
   '@esbuild/win32-ia32@0.27.3':
     resolution: {integrity: sha512-QLKSFeXNS8+tHW7tZpMtjlNb7HKau0QDpwm49u0vUp9y1WOF+PEzkU84y9GqYaAVW8aH8f3GcBck26jh54cX4Q==}
     engines: {node: '>=18'}
     cpu: [ia32]
     os: [win32]
 
+  '@esbuild/win32-x64@0.21.5':
+    resolution: {integrity: sha512-tQd/1efJuzPC6rCFwEvLtci/xNFcTZknmXs98FYDfGE4wP9ClFV98nyKrzJKVPMhdDnjzLhdUyMX4PsQAPjwIw==}
+    engines: {node: '>=12'}
+    cpu: [x64]
+    os: [win32]
+
   '@esbuild/win32-x64@0.27.3':
     resolution: {integrity: sha512-4uJGhsxuptu3OcpVAzli+/gWusVGwZZHTlS63hh++ehExkVT8SgiEf7/uC/PclrPPkLhZqGgCTjd0VWLo6xMqA==}
     engines: {node: '>=18'}
@@ -561,6 +702,35 @@ packages:
     resolution: {integrity: sha512-KiROIzYdEV85YygXw6BI/Dx4fnBlFQu6Mq4QE4MOH9fFnhohw6wX/OAvDY2/C+ut0I3RSPKenvZJIVYqJNkhEw==}
     engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
 
+  '@vitest/expect@2.1.9':
+    resolution: {integrity: sha512-UJCIkTBenHeKT1TTlKMJWy1laZewsRIzYighyYiJKZreqtdxSos/S1t+ktRMQWu2CKqaarrkeszJx1cgC5tGZw==}
+
+  '@vitest/mocker@2.1.9':
+    resolution: {integrity: sha512-tVL6uJgoUdi6icpxmdrn5YNo3g3Dxv+IHJBr0GXHaEdTcw3F+cPKnsXFhli6nO+f/6SDKPHEK1UN+k+TQv0Ehg==}
+    peerDependencies:
+      msw: ^2.4.9
+      vite: ^5.0.0
+    peerDependenciesMeta:
+      msw:
+        optional: true
+      vite:
+        optional: true
+
+  '@vitest/pretty-format@2.1.9':
+    resolution: {integrity: sha512-KhRIdGV2U9HOUzxfiHmY8IFHTdqtOhIzCpd8WRdJiE7D/HUcZVD0EgQCVjm+Q9gkUXWgBvMmTtZgIG48wq7sOQ==}
+
+  '@vitest/runner@2.1.9':
+    resolution: {integrity: sha512-ZXSSqTFIrzduD63btIfEyOmNcBmQvgOVsPNPe0jYtESiXkhd8u2erDLnMxmGrDCwHCCHE7hxwRDCT3pt0esT4g==}
+
+  '@vitest/snapshot@2.1.9':
+    resolution: {integrity: sha512-oBO82rEjsxLNJincVhLhaxxZdEtV0EFHMK5Kmx5sJ6H9L183dHECjiefOAdnqpIgT5eZwT04PoggUnW88vOBNQ==}
+
+  '@vitest/spy@2.1.9':
+    resolution: {integrity: sha512-E1B35FwzXXTs9FHNK6bDszs7mtydNi5MIfUWpceJ8Xbfb1gBMscAnwLbEu+B44ed6W3XjL9/ehLPHR1fkf1KLQ==}
+
+  '@vitest/utils@2.1.9':
+    resolution: {integrity: sha512-v0psaMSkNJ3A2NMrUEHFRzJtDPFn+/VWZ5WxImB21T9fjucJRmS7xCS3ppEnARb9y11OAzaD+P2Ps+b+BGX5iQ==}
+
   acorn-jsx@5.3.2:
     resolution: {integrity: sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==}
     peerDependencies:
@@ -596,6 +766,10 @@ packages:
   argparse@2.0.1:
     resolution: {integrity: sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==}
 
+  assertion-error@2.0.1:
+    resolution: {integrity: sha512-Izi8RQcffqCeNVgFigKli1ssklIbpHnCYc6AknXGYoB6grJqyeby7jv12JUQgmTAnIDnbck1uxksT4dzN3PWBA==}
+    engines: {node: '>=12'}
+
   balanced-match@1.0.2:
     resolution: {integrity: sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==}
 
@@ -634,6 +808,14 @@ packages:
     resolution: {integrity: sha512-b6Ilus+c3RrdDk+JhLKUAQfzzgLEPy6wcXqS7f/xe1EETvsDP6GORG7SFuOs6cID5YkqchW/LXZbX5bc8j7ZcQ==}
     engines: {node: '>=8'}
 
+  chai@5.3.3:
+    resolution: {integrity: sha512-4zNhdJD/iOjSH0A05ea+Ke6MU5mmpQcbQsSOkgdaUMJ9zTlDTD/GYlwohmIE2u0gaxHYiVHEn1Fw9mZ/ktJWgw==}
+    engines: {node: '>=18'}
+
+  check-error@2.1.3:
+    resolution: {integrity: sha512-PAJdDJusoxnwm1VwW07VWwUN1sl7smmC3OKggvndJFadxxDRyFJBX/ggnu/KE4kQAB7a3Dp8f/YXC1FlUprWmA==}
+    engines: {node: '>= 16'}
+
   chokidar@4.0.3:
     resolution: {integrity: sha512-Qgzu8kfBvo+cA4962jnP1KkS6Dop5NS6g7R5LFYJr4b8Ub94PPQXUksCw9PvXoeXPRRddRNC5C1JQUR2SMGtnA==}
     engines: {node: '>= 14.16.0'}
@@ -676,6 +858,10 @@ packages:
       supports-color:
         optional: true
 
+  deep-eql@5.0.2:
+    resolution: {integrity: sha512-h5k/5U50IJJFpzfL6nO9jaaumfjO/f2NjK/oYB2Djzm4p9L+3T9qWpZqZ2hAbLPuuYq9wrU08WQyBTL5GbPk5Q==}
+    engines: {node: '>=6'}
+
   deep-is@0.1.4:
     resolution: {integrity: sha512-oIPzksmTg4/MriiaYGO+okXDT7ztn/w3Eptv/+gSIdMdKsJo0u4CfYNFJPy+4SKMuCqGw2wxnA+URMg3t8a/bQ==}
 
@@ -692,6 +878,14 @@ packages:
     resolution: {integrity: sha512-V0hjH4dGPh9Ao5p0MoRY6BVqtwCjhz6vI5LT8AJ55H+4g9/4vbHx1I54fS0XuclLhDHArPQCiMjDxjaL8fPxhw==}
     engines: {node: '>=0.12'}
 
+  es-module-lexer@1.7.0:
+    resolution: {integrity: sha512-jEQoCwk8hyb2AZziIOLhDqpm5+2ww5uIE6lkO/6jcOCusfk6LhMHpXXfBLXTZ7Ydyt0j4VoUQv6uGNYbdW+kBA==}
+
+  esbuild@0.21.5:
+    resolution: {integrity: sha512-mg3OPMV4hXywwpoDxu3Qda5xCKQi+vCTZq8S9J/EpkhB2HzKXq4SNFZE3+NK93JYxc8VMSep+lOUSC/RVKaBqw==}
+    engines: {node: '>=12'}
+    hasBin: true
+
   esbuild@0.27.3:
     resolution: {integrity: sha512-8VwMnyGCONIs6cWue2IdpHxHnAjzxnw2Zr7MkVxB2vjmQ2ivqGFb4LEG3SMnv0Gb2F/G/2yA8zUaiL1gywDCCg==}
     engines: {node: '>=18'}
@@ -749,10 +943,17 @@ packages:
     resolution: {integrity: sha512-MMdARuVEQziNTeJD8DgMqmhwR11BRQ/cBP+pLtYdSTnf3MIO8fFeiINEbX36ZdNlfU/7A9f3gUw49B3oQsvwBA==}
     engines: {node: '>=4.0'}
 
+  estree-walker@3.0.3:
+    resolution: {integrity: sha512-7RUKfXgSMMkzt6ZuXmqapOurLGPPfgj6l9uRZ7lRGolvk0y2yocc35LdcxKC5PQZdn2DMqioAQ2NoWcrTKmm6g==}
+
   esutils@2.0.3:
     resolution: {integrity: sha512-kVscqXk4OCp68SZ0dkgEKVi6/8ij300KBWTJq32P/dYeWTSwK41WyTxalN1eRmA5Z9UU/LX9D7FWSmV9SAYx6g==}
     engines: {node: '>=0.10.0'}
 
+  expect-type@1.3.0:
+    resolution: {integrity: sha512-knvyeauYhqjOYvQ66MznSMs83wmHrCycNEN6Ao+2AeYEfxUIkuiVxdEa1qlGEPK+We3n0THiDciYSsCcgW/DoA==}
+    engines: {node: '>=12.0.0'}
+
   fast-deep-equal@3.1.3:
     resolution: {integrity: sha512-f3qQ9oQy9j2AhBe/H9VC91wLmKBCCU/gDOnKNAYG5hswO7BLKj09Hc5HYNz9cGI++xlpDCIgDaitVs03ATR84Q==}
 
@@ -898,6 +1099,9 @@ packages:
     resolution: {integrity: sha512-iPZK6eYjbxRu3uB4/WZ3EsEIMJFMqAoopl3R+zuq0UjcAm/MO6KCweDgPfP3elTztoKP3KtnVHxTn2NHBSDVUw==}
     engines: {node: '>=10'}
 
+  loupe@3.2.1:
+    resolution: {integrity: sha512-CdzqowRJCeLU72bHvWqwRBBlLcMEtIvGrlvef74kMnV2AolS9Y8xUv1I0U/MNAWMhBlKIoyuEgoJ0t/bbwHbLQ==}
+
   lru-cache@10.4.3:
     resolution: {integrity: sha512-JNAzZcXrCt42VGLuYz0zfAzDfAvJWW6AfYlDBQyDV5DClI2m5sAmK+OIO7s59XfsRsWHp02jAJrRadPRGTt6SQ==}
 
@@ -943,6 +1147,11 @@ packages:
   mz@2.7.0:
     resolution: {integrity: sha512-z81GNO7nnYMEhrGh9LeymoE4+Yr0Wn5McHIZMK5cfQCl+NDX08sCZgUc9/6MHni9IWuFLm1Z3HTCXu2z9fN62Q==}
 
+  nanoid@3.3.12:
+    resolution: {integrity: sha512-ZB9RH/39qpq5Vu6Y+NmUaFhQR6pp+M2Xt76XBnEwDaGcVAqhlvxrl3B2bKS5D3NH3QR76v3aSrKaF/Kiy7lEtQ==}
+    engines: {node: ^10 || ^12 || ^13.7 || ^14 || >=15.0.1}
+    hasBin: true
+
   natural-compare@1.4.0:
     resolution: {integrity: sha512-OWND8ei3VtNC9h7V60qff3SVobHr996CTwgxubgyQYEpg290h9J0buyECNNJexkFm5sOajh5G116RYA1c8ZMSw==}
 
@@ -977,9 +1186,16 @@ packages:
     resolution: {integrity: sha512-Xa4Nw17FS9ApQFJ9umLiJS4orGjm7ZzwUrwamcGQuHSzDyth9boKDaycYdDcZDuqYATXw4HFXgaqWTctW/v1HA==}
     engines: {node: '>=16 || 14 >=14.18'}
 
+  pathe@1.1.2:
+    resolution: {integrity: sha512-whLdWMYL2TwI08hn8/ZqAbrVemu0LNaNNJZX73O6qaIdCTfXutsLhMkjdENX0qhsQ9uIimo4/aQOmXkoon2nDQ==}
+
   pathe@2.0.3:
     resolution: {integrity: sha512-WUjGcAqP1gQacoQe+OBJsFA7Ld4DyXuUIjZ5cc75cLHvJ7dtNsTugphxIADwspS+AraAUePCKrSVtPLFj/F88w==}
 
+  pathval@2.0.1:
+    resolution: {integrity: sha512-//nshmD55c46FuFw26xV/xFAaB5HF9Xdap7HJBBnrKdAd6/GxDBaNA1870O79+9ueg61cZLSVc+OaFlfmObYVQ==}
+    engines: {node: '>= 14.16'}
+
   picocolors@1.1.1:
     resolution: {integrity: sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==}
 
@@ -1012,6 +1228,10 @@ packages:
       yaml:
         optional: true
 
+  postcss@8.5.15:
+    resolution: {integrity: sha512-FfR8sjd4em2T6fb3I2MwAJU7HWVMr9zba+enmQeeWFfCbm+UOC/0X4DS8XtpUTMwWMGbjKYP7xjfNekzyGmB3A==}
+    engines: {node: ^10 || ^12 || >=14}
+
   prelude-ls@1.2.1:
     resolution: {integrity: sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==}
     engines: {node: '>= 0.8.0'}
@@ -1059,14 +1279,27 @@ packages:
     resolution: {integrity: sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==}
     engines: {node: '>=8'}
 
+  siginfo@2.0.0:
+    resolution: {integrity: sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==}
+
   signal-exit@4.1.0:
     resolution: {integrity: sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw==}
     engines: {node: '>=14'}
 
+  source-map-js@1.2.1:
+    resolution: {integrity: sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==}
+    engines: {node: '>=0.10.0'}
+
   source-map@0.7.6:
     resolution: {integrity: sha512-i5uvt8C3ikiWeNZSVZNWcfZPItFQOsYTUAOkcUPGd8DqDy1uOUikjt5dG+uRlwyvR108Fb9DOd4GvXfT0N2/uQ==}
     engines: {node: '>= 12'}
 
+  stackback@0.0.2:
+    resolution: {integrity: sha512-1XMJE5fQo1jGH6Y/7ebnwPOBEkIEnT4QF32d5R1+VXdXveM0IBMJt8zfaxX1P3QhVwrYe+576+jkANtSS2mBbw==}
+
+  std-env@3.10.0:
+    resolution: {integrity: sha512-5GS12FdOZNliM5mAOxFRg7Ir0pWz8MdpYm6AY6VPkGpbA7ZzmbzNcBJQ0GPvvyWgcY7QAhCgf9Uy89I03faLkg==}
+
   string-width@4.2.3:
     resolution: {integrity: sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==}
     engines: {node: '>=8'}
@@ -1103,6 +1336,9 @@ packages:
   thenify@3.3.1:
     resolution: {integrity: sha512-RVZSIV5IG10Hk3enotrhvz0T9em6cyHBLkH/YAZuKqd8hRkKhSfCGIcP2KUY0EPxndzANBmNllzWPwak+bheSw==}
 
+  tinybench@2.9.0:
+    resolution: {integrity: sha512-0+DUvqWMValLmha6lr4kD8iAMK1HzV0/aKnCtWb9v9641TnP/MFb7Pc2bxoxQjTXAErryXVgUOfv2YqNllqGeg==}
+
   tinyexec@0.3.2:
     resolution: {integrity: sha512-KQQR9yN7R5+OSwaK0XQoj22pwHoTlgYqmUscPYoknOoWCWfj/5/ABTMRi69FrKU5ffPVh5QcFikpWJI/P1ocHA==}
 
@@ -1110,6 +1346,18 @@ packages:
     resolution: {integrity: sha512-j2Zq4NyQYG5XMST4cbs02Ak8iJUdxRM0XI5QyxXuZOzKOINmWurp3smXu3y5wDcJrptwpSjgXHzIQxR0omXljQ==}
     engines: {node: '>=12.0.0'}
 
+  tinypool@1.1.1:
+    resolution: {integrity: sha512-Zba82s87IFq9A9XmjiX5uZA/ARWDrB03OHlq+Vw1fSdt0I+4/Kutwy8BP4Y/y/aORMo61FQ0vIb5j44vSo5Pkg==}
+    engines: {node: ^18.0.0 || >=20.0.0}
+
+  tinyrainbow@1.2.0:
+    resolution: {integrity: sha512-weEDEq7Z5eTHPDh4xjX789+fHfF+P8boiFB+0vbWzpbnbsEr/GRaohi/uMKxg8RZMXnl1ItAi/IUHWMsjDV7kQ==}
+    engines: {node: '>=14.0.0'}
+
+  tinyspy@3.0.2:
+    resolution: {integrity: sha512-n1cw8k1k0x4pgA2+9XrOkFydTerNcJ1zWCO5Nn9scWHTD+5tp8dghT2x1uduQePZTZgd3Tupf+x9BxJjeJi77Q==}
+    engines: {node: '>=14.0.0'}
+
   tree-kill@1.2.2:
     resolution: {integrity: sha512-L0Orpi8qGpRG//Nd+H90vFB+3iHnue1zSSGmNOOCh1GLJ7rUKVwV2HvijphGQS2UmhUZewS9VgvxYIdgr+fG1A==}
     hasBin: true
@@ -1187,11 +1435,77 @@ packages:
     resolution: {integrity: sha512-kiGUalWN+rgBJ/1OHZsBtU4rXZOfj/7rKQxULKlIzwzQSvMJUUNgPwJEEh7gU6xEVxC0ahoOBvN2YI8GH6FNgA==}
     engines: {node: '>=10.12.0'}
 
+  vite-node@2.1.9:
+    resolution: {integrity: sha512-AM9aQ/IPrW/6ENLQg3AGY4K1N2TGZdR5e4gu/MmmR2xR3Ll1+dib+nook92g4TV3PXVyeyxdWwtaCAiUL0hMxA==}
+    engines: {node: ^18.0.0 || >=20.0.0}
+    hasBin: true
+
+  vite@5.4.21:
+    resolution: {integrity: sha512-o5a9xKjbtuhY6Bi5S3+HvbRERmouabWbyUcpXXUA1u+GNUKoROi9byOJ8M0nHbHYHkYICiMlqxkg1KkYmm25Sw==}
+    engines: {node: ^18.0.0 || >=20.0.0}
+    hasBin: true
+    peerDependencies:
+      '@types/node': ^18.0.0 || >=20.0.0
+      less: '*'
+      lightningcss: ^1.21.0
+      sass: '*'
+      sass-embedded: '*'
+      stylus: '*'
+      sugarss: '*'
+      terser: ^5.4.0
+    peerDependenciesMeta:
+      '@types/node':
+        optional: true
+      less:
+        optional: true
+      lightningcss:
+        optional: true
+      sass:
+        optional: true
+      sass-embedded:
+        optional: true
+      stylus:
+        optional: true
+      sugarss:
+        optional: true
+      terser:
+        optional: true
+
+  vitest@2.1.9:
+    resolution: {integrity: sha512-MSmPM9REYqDGBI8439mA4mWhV5sKmDlBKWIYbA3lRb2PTHACE0mgKwA8yQ2xq9vxDTuk4iPrECBAEW2aoFXY0Q==}
+    engines: {node: ^18.0.0 || >=20.0.0}
+    hasBin: true
+    peerDependencies:
+      '@edge-runtime/vm': '*'
+      '@types/node': ^18.0.0 || >=20.0.0
+      '@vitest/browser': 2.1.9
+      '@vitest/ui': 2.1.9
+      happy-dom: '*'
+      jsdom: '*'
+    peerDependenciesMeta:
+      '@edge-runtime/vm':
+        optional: true
+      '@types/node':
+        optional: true
+      '@vitest/browser':
+        optional: true
+      '@vitest/ui':
+        optional: true
+      happy-dom:
+        optional: true
+      jsdom:
+        optional: true
+
   which@2.0.2:
     resolution: {integrity: sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==}
     engines: {node: '>= 8'}
     hasBin: true
 
+  why-is-node-running@2.3.0:
+    resolution: {integrity: sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==}
+    engines: {node: '>=8'}
+    hasBin: true
+
   word-wrap@1.2.5:
     resolution: {integrity: sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==}
     engines: {node: '>=0.10.0'}
@@ -1242,81 +1556,150 @@ snapshots:
 
   '@bcoe/v8-coverage@1.0.2': {}
 
+  '@esbuild/aix-ppc64@0.21.5':
+    optional: true
+
   '@esbuild/aix-ppc64@0.27.3':
     optional: true
 
+  '@esbuild/android-arm64@0.21.5':
+    optional: true
+
   '@esbuild/android-arm64@0.27.3':
     optional: true
 
+  '@esbuild/android-arm@0.21.5':
+    optional: true
+
   '@esbuild/android-arm@0.27.3':
     optional: true
 
+  '@esbuild/android-x64@0.21.5':
+    optional: true
+
   '@esbuild/android-x64@0.27.3':
     optional: true
 
+  '@esbuild/darwin-arm64@0.21.5':
+    optional: true
+
   '@esbuild/darwin-arm64@0.27.3':
     optional: true
 
+  '@esbuild/darwin-x64@0.21.5':
+    optional: true
+
   '@esbuild/darwin-x64@0.27.3':
     optional: true
 
+  '@esbuild/freebsd-arm64@0.21.5':
+    optional: true
+
   '@esbuild/freebsd-arm64@0.27.3':
     optional: true
 
+  '@esbuild/freebsd-x64@0.21.5':
+    optional: true
+
   '@esbuild/freebsd-x64@0.27.3':
     optional: true
 
+  '@esbuild/linux-arm64@0.21.5':
+    optional: true
+
   '@esbuild/linux-arm64@0.27.3':
     optional: true
 
+  '@esbuild/linux-arm@0.21.5':
+    optional: true
+
   '@esbuild/linux-arm@0.27.3':
     optional: true
 
+  '@esbuild/linux-ia32@0.21.5':
+    optional: true
+
   '@esbuild/linux-ia32@0.27.3':
     optional: true
 
+  '@esbuild/linux-loong64@0.21.5':
+    optional: true
+
   '@esbuild/linux-loong64@0.27.3':
     optional: true
 
+  '@esbuild/linux-mips64el@0.21.5':
+    optional: true
+
   '@esbuild/linux-mips64el@0.27.3':
     optional: true
 
+  '@esbuild/linux-ppc64@0.21.5':
+    optional: true
+
   '@esbuild/linux-ppc64@0.27.3':
     optional: true
 
+  '@esbuild/linux-riscv64@0.21.5':
+    optional: true
+
   '@esbuild/linux-riscv64@0.27.3':
     optional: true
 
+  '@esbuild/linux-s390x@0.21.5':
+    optional: true
+
   '@esbuild/linux-s390x@0.27.3':
     optional: true
 
+  '@esbuild/linux-x64@0.21.5':
+    optional: true
+
   '@esbuild/linux-x64@0.27.3':
     optional: true
 
   '@esbuild/netbsd-arm64@0.27.3':
     optional: true
 
+  '@esbuild/netbsd-x64@0.21.5':
+    optional: true
+
   '@esbuild/netbsd-x64@0.27.3':
     optional: true
 
   '@esbuild/openbsd-arm64@0.27.3':
     optional: true
 
+  '@esbuild/openbsd-x64@0.21.5':
+    optional: true
+
   '@esbuild/openbsd-x64@0.27.3':
     optional: true
 
   '@esbuild/openharmony-arm64@0.27.3':
     optional: true
 
+  '@esbuild/sunos-x64@0.21.5':
+    optional: true
+
   '@esbuild/sunos-x64@0.27.3':
     optional: true
 
+  '@esbuild/win32-arm64@0.21.5':
+    optional: true
+
   '@esbuild/win32-arm64@0.27.3':
     optional: true
 
+  '@esbuild/win32-ia32@0.21.5':
+    optional: true
+
   '@esbuild/win32-ia32@0.27.3':
     optional: true
 
+  '@esbuild/win32-x64@0.21.5':
+    optional: true
+
   '@esbuild/win32-x64@0.27.3':
     optional: true
 
@@ -1605,6 +1988,46 @@ snapshots:
       '@typescript-eslint/types': 8.56.1
       eslint-visitor-keys: 5.0.1
 
+  '@vitest/expect@2.1.9':
+    dependencies:
+      '@vitest/spy': 2.1.9
+      '@vitest/utils': 2.1.9
+      chai: 5.3.3
+      tinyrainbow: 1.2.0
+
+  '@vitest/mocker@2.1.9(vite@5.4.21(@types/node@22.15.0))':
+    dependencies:
+      '@vitest/spy': 2.1.9
+      estree-walker: 3.0.3
+      magic-string: 0.30.21
+    optionalDependencies:
+      vite: 5.4.21(@types/node@22.15.0)
+
+  '@vitest/pretty-format@2.1.9':
+    dependencies:
+      tinyrainbow: 1.2.0
+
+  '@vitest/runner@2.1.9':
+    dependencies:
+      '@vitest/utils': 2.1.9
+      pathe: 1.1.2
+
+  '@vitest/snapshot@2.1.9':
+    dependencies:
+      '@vitest/pretty-format': 2.1.9
+      magic-string: 0.30.21
+      pathe: 1.1.2
+
+  '@vitest/spy@2.1.9':
+    dependencies:
+      tinyspy: 3.0.2
+
+  '@vitest/utils@2.1.9':
+    dependencies:
+      '@vitest/pretty-format': 2.1.9
+      loupe: 3.2.1
+      tinyrainbow: 1.2.0
+
   acorn-jsx@5.3.2(acorn@8.16.0):
     dependencies:
       acorn: 8.16.0
@@ -1632,6 +2055,8 @@ snapshots:
 
   argparse@2.0.1: {}
 
+  assertion-error@2.0.1: {}
+
   balanced-match@1.0.2: {}
 
   balanced-match@4.0.4: {}
@@ -1669,6 +2094,16 @@ snapshots:
 
   cac@6.7.14: {}
 
+  chai@5.3.3:
+    dependencies:
+      assertion-error: 2.0.1
+      check-error: 2.1.3
+      deep-eql: 5.0.2
+      loupe: 3.2.1
+      pathval: 2.0.1
+
+  check-error@2.1.3: {}
+
   chokidar@4.0.3:
     dependencies:
       readdirp: 4.1.2
@@ -1703,6 +2138,8 @@ snapshots:
     dependencies:
       ms: 2.1.3
 
+  deep-eql@5.0.2: {}
+
   deep-is@0.1.4: {}
 
   eastasianwidth@0.2.0: {}
@@ -1713,6 +2150,34 @@ snapshots:
 
   entities@4.5.0: {}
 
+  es-module-lexer@1.7.0: {}
+
+  esbuild@0.21.5:
+    optionalDependencies:
+      '@esbuild/aix-ppc64': 0.21.5
+      '@esbuild/android-arm': 0.21.5
+      '@esbuild/android-arm64': 0.21.5
+      '@esbuild/android-x64': 0.21.5
+      '@esbuild/darwin-arm64': 0.21.5
+      '@esbuild/darwin-x64': 0.21.5
+      '@esbuild/freebsd-arm64': 0.21.5
+      '@esbuild/freebsd-x64': 0.21.5
+      '@esbuild/linux-arm': 0.21.5
+      '@esbuild/linux-arm64': 0.21.5
+      '@esbuild/linux-ia32': 0.21.5
+      '@esbuild/linux-loong64': 0.21.5
+      '@esbuild/linux-mips64el': 0.21.5
+      '@esbuild/linux-ppc64': 0.21.5
+      '@esbuild/linux-riscv64': 0.21.5
+      '@esbuild/linux-s390x': 0.21.5
+      '@esbuild/linux-x64': 0.21.5
+      '@esbuild/netbsd-x64': 0.21.5
+      '@esbuild/openbsd-x64': 0.21.5
+      '@esbuild/sunos-x64': 0.21.5
+      '@esbuild/win32-arm64': 0.21.5
+      '@esbuild/win32-ia32': 0.21.5
+      '@esbuild/win32-x64': 0.21.5
+
   esbuild@0.27.3:
     optionalDependencies:
       '@esbuild/aix-ppc64': 0.27.3
@@ -1812,8 +2277,14 @@ snapshots:
 
   estraverse@5.3.0: {}
 
+  estree-walker@3.0.3:
+    dependencies:
+      '@types/estree': 1.0.8
+
   esutils@2.0.3: {}
 
+  expect-type@1.3.0: {}
+
   fast-deep-equal@3.1.3: {}
 
   fast-json-stable-stringify@2.1.0: {}
@@ -1939,6 +2410,8 @@ snapshots:
     dependencies:
       p-locate: 5.0.0
 
+  loupe@3.2.1: {}
+
   lru-cache@10.4.3: {}
 
   lunr@2.3.9: {}
@@ -1991,6 +2464,8 @@ snapshots:
       object-assign: 4.1.1
       thenify-all: 1.6.0
 
+  nanoid@3.3.12: {}
+
   natural-compare@1.4.0: {}
 
   object-assign@4.1.1: {}
@@ -2023,8 +2498,12 @@ snapshots:
       lru-cache: 10.4.3
       minipass: 7.1.3
 
+  pathe@1.1.2: {}
+
   pathe@2.0.3: {}
 
+  pathval@2.0.1: {}
+
   picocolors@1.1.1: {}
 
   picomatch@4.0.3: {}
@@ -2037,12 +2516,19 @@ snapshots:
       mlly: 1.8.0
       pathe: 2.0.3
 
-  postcss-load-config@6.0.1(yaml@2.9.0):
+  postcss-load-config@6.0.1(postcss@8.5.15)(yaml@2.9.0):
     dependencies:
       lilconfig: 3.1.3
     optionalDependencies:
+      postcss: 8.5.15
       yaml: 2.9.0
 
+  postcss@8.5.15:
+    dependencies:
+      nanoid: 3.3.12
+      picocolors: 1.1.1
+      source-map-js: 1.2.1
+
   prelude-ls@1.2.1: {}
 
   prettier@3.8.1: {}
@@ -2096,10 +2582,18 @@ snapshots:
 
   shebang-regex@3.0.0: {}
 
+  siginfo@2.0.0: {}
+
   signal-exit@4.1.0: {}
 
+  source-map-js@1.2.1: {}
+
   source-map@0.7.6: {}
 
+  stackback@0.0.2: {}
+
+  std-env@3.10.0: {}
+
   string-width@4.2.3:
     dependencies:
       emoji-regex: 8.0.0
@@ -2148,6 +2642,8 @@ snapshots:
     dependencies:
       any-promise: 1.3.0
 
+  tinybench@2.9.0: {}
+
   tinyexec@0.3.2: {}
 
   tinyglobby@0.2.15:
@@ -2155,6 +2651,12 @@ snapshots:
       fdir: 6.5.0(picomatch@4.0.3)
       picomatch: 4.0.3
 
+  tinypool@1.1.1: {}
+
+  tinyrainbow@1.2.0: {}
+
+  tinyspy@3.0.2: {}
+
   tree-kill@1.2.2: {}
 
   ts-api-utils@2.4.0(typescript@5.9.3):
@@ -2163,7 +2665,7 @@ snapshots:
 
   ts-interface-checker@0.1.13: {}
 
-  tsup@8.5.1(typescript@5.9.3)(yaml@2.9.0):
+  tsup@8.5.1(postcss@8.5.15)(typescript@5.9.3)(yaml@2.9.0):
     dependencies:
       bundle-require: 5.1.0(esbuild@0.27.3)
       cac: 6.7.14
@@ -2174,7 +2676,7 @@ snapshots:
       fix-dts-default-cjs-exports: 1.0.1
       joycon: 3.1.1
       picocolors: 1.1.1
-      postcss-load-config: 6.0.1(yaml@2.9.0)
+      postcss-load-config: 6.0.1(postcss@8.5.15)(yaml@2.9.0)
       resolve-from: 5.0.0
       rollup: 4.59.0
       source-map: 0.7.6
@@ -2183,6 +2685,7 @@ snapshots:
       tinyglobby: 0.2.15
       tree-kill: 1.2.2
     optionalDependencies:
+      postcss: 8.5.15
       typescript: 5.9.3
     transitivePeerDependencies:
       - jiti
@@ -2236,10 +2739,77 @@ snapshots:
       '@types/istanbul-lib-coverage': 2.0.6
       convert-source-map: 2.0.0
 
+  vite-node@2.1.9(@types/node@22.15.0):
+    dependencies:
+      cac: 6.7.14
+      debug: 4.4.3
+      es-module-lexer: 1.7.0
+      pathe: 1.1.2
+      vite: 5.4.21(@types/node@22.15.0)
+    transitivePeerDependencies:
+      - '@types/node'
+      - less
+      - lightningcss
+      - sass
+      - sass-embedded
+      - stylus
+      - sugarss
+      - supports-color
+      - terser
+
+  vite@5.4.21(@types/node@22.15.0):
+    dependencies:
+      esbuild: 0.21.5
+      postcss: 8.5.15
+      rollup: 4.59.0
+    optionalDependencies:
+      '@types/node': 22.15.0
+      fsevents: 2.3.3
+
+  vitest@2.1.9(@types/node@22.15.0):
+    dependencies:
+      '@vitest/expect': 2.1.9
+      '@vitest/mocker': 2.1.9(vite@5.4.21(@types/node@22.15.0))
+      '@vitest/pretty-format': 2.1.9
+      '@vitest/runner': 2.1.9
+      '@vitest/snapshot': 2.1.9
+      '@vitest/spy': 2.1.9
+      '@vitest/utils': 2.1.9
+      chai: 5.3.3
+      debug: 4.4.3
+      expect-type: 1.3.0
+      magic-string: 0.30.21
+      pathe: 1.1.2
+      std-env: 3.10.0
+      tinybench: 2.9.0
+      tinyexec: 0.3.2
+      tinypool: 1.1.1
+      tinyrainbow: 1.2.0
+      vite: 5.4.21(@types/node@22.15.0)
+      vite-node: 2.1.9(@types/node@22.15.0)
+      why-is-node-running: 2.3.0
+    optionalDependencies:
+      '@types/node': 22.15.0
+    transitivePeerDependencies:
+      - less
+      - lightningcss
+      - msw
+      - sass
+      - sass-embedded
+      - stylus
+      - sugarss
+      - supports-color
+      - terser
+
   which@2.0.2:
     dependencies:
       isexe: 2.0.0
 
+  why-is-node-running@2.3.0:
+    dependencies:
+      siginfo: 2.0.0
+      stackback: 0.0.2
+
   word-wrap@1.2.5: {}
 
   wrap-ansi@7.0.0:
diff --git a/src/engines/uaq.ts b/src/engines/uaq.ts
index 3984391..b93cc08 100644
--- a/src/engines/uaq.ts
+++ b/src/engines/uaq.ts
@@ -34,14 +34,17 @@ function findYearEntry(hy: number): HijriYearRecord | null {
   return null;
 }
 
-// toHijri uses local date components (getFullYear, getMonth, getDate) so that
-// the calendar-date lookup is timezone-safe regardless of the host environment.
+// toHijri interprets the input Date by its UTC calendar day (getUTC* components),
+// matching the FCNA engine and the UTC-midnight Dates returned by toGregorian.
+// This makes conversions host-timezone-independent and round-trips exact:
+//   toHijri(toGregorian(hy, hm, hd)) === { hy, hm, hd }  on any machine.
+// To convert a local wall-clock date, pass new Date(Date.UTC(y, m - 1, d)).
 function uaqToHijri(date: Date): HijriDate | null {
   if (!(date instanceof Date) || isNaN(date.getTime())) {
     throw new Error("Invalid Gregorian date");
   }
 
-  const inputUtc = Date.UTC(date.getFullYear(), date.getMonth(), date.getDate());
+  const inputUtc = Date.UTC(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate());
 
   // Binary search: find the last table entry whose Gregorian start date <= input.
   let lo = 0;
diff --git a/src/index.ts b/src/index.ts
index 28751c8..e1083db 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -34,6 +34,14 @@ import type { HijriDate, ConversionOptions } from "./types";
  * Uses the UAQ (Umm al-Qura) calendar by default. Pass `{ calendar: 'fcna' }`
  * or any registered calendar name via options to use a different engine.
  *
+ * **Time-zone contract:** the Date is interpreted by its UTC calendar day
+ * (`getUTCFullYear`, `getUTCMonth`, `getUTCDate`). `toGregorian` returns a
+ * UTC-midnight Date, so round-trips are exact and results are identical on
+ * every host regardless of its local time zone.
+ *
+ * To convert a local wall-clock date, pass `new Date(Date.UTC(y, m - 1, d))`.
+ * Note that `new Date("2025-03-01")` parses as UTC midnight, which is correct.
+ *
  * @param date - a valid JavaScript Date object
  * @param options - conversion options (calendar engine selection)
  * @returns the corresponding Hijri date, or null if the date is out of range
diff --git a/test-cjs.cjs b/test-cjs.cjs
index decfe22..af41903 100644
--- a/test-cjs.cjs
+++ b/test-cjs.cjs
@@ -61,7 +61,7 @@ describe('CJS UAQ conversions', () => {
     assert.equal(d.toISOString().slice(0, 10), '2025-03-01');
   });
   it('toHijri: 2023-03-23 = 1444/9/1', () => {
-    const h = toHijri(new Date(2023, 2, 23, 12));
+    const h = toHijri(new Date(Date.UTC(2023, 2, 23, 12)));
     assert.ok(h !== null);
     assert.equal(h.hy, 1444);
     assert.equal(h.hm, 9);
diff --git a/test.mjs b/test.mjs
index ac47a6b..a5feb4b 100644
--- a/test.mjs
+++ b/test.mjs
@@ -97,19 +97,28 @@ describe('UAQ toGregorian', () => {
 
 describe('UAQ toHijri', () => {
   it('2023-03-23 = 1444/9/1', () => {
-    const h = toHijri(new Date(2023, 2, 23, 12));
+    const h = toHijri(new Date(Date.UTC(2023, 2, 23, 12)));
     assert.ok(h !== null);
     assert.equal(h.hy, 1444);
     assert.equal(h.hm, 9);
     assert.equal(h.hd, 1);
   });
   it('2025-03-01 = 1446/9/1', () => {
-    const h = toHijri(new Date(2025, 2, 1, 12));
+    const h = toHijri(new Date(Date.UTC(2025, 2, 1, 12)));
     assert.ok(h !== null);
     assert.equal(h.hy, 1446);
     assert.equal(h.hm, 9);
     assert.equal(h.hd, 1);
   });
+  it('UAQ round-trip: toHijri(toGregorian(1446, 9, 1)) = 1446/9/1', () => {
+    const greg = toGregorian(1446, 9, 1);
+    assert.ok(greg instanceof Date);
+    const hijri = toHijri(greg);
+    assert.ok(hijri !== null);
+    assert.equal(hijri.hy, 1446);
+    assert.equal(hijri.hm, 9);
+    assert.equal(hijri.hd, 1);
+  });
 });
 
 // ─── UAQ isValidHijriDate ───────────────────────────────────────────────────
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..97bcf6b
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,9 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: "node",
+    include: ["hijri-core.test.ts"],
+  },
+});