fix(deps): update dependency recharts to v3

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [zod](https://zod.dev) ([source](https://github.com/colinhacks/zod)) | [`^3.24.3` -> `^4.0.0`](https://renovatebot.com/diffs/npm/zod/3.25.76/4.0.5) | [![age](https://developer.mend.io/api/mc/badges/age/npm/zod/4.0.5?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/zod/3.25.76/4.0.5?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>colinhacks/zod (zod)</summary>

### [`v4.0.5`](https://github.com/colinhacks/zod/releases/tag/v4.0.5)

[Compare Source](https://github.com/colinhacks/zod/compare/v4.0.4...v4.0.5)

#### Commits:

- [`f91a73e`](f91a73ec23) Support pipes in discriminated unions. Closes [#&#8203;4856](https://github.com/colinhacks/zod/issues/4856) ([#&#8203;4861](https://github.com/colinhacks/zod/issues/4861))
- [`45afab0`](45afab0f84) 4.0.5

### [`v4.0.4`](https://github.com/colinhacks/zod/releases/tag/v4.0.4)

[Compare Source](https://github.com/colinhacks/zod/compare/v4.0.3...v4.0.4)

#### Commits:

- [`9335f05`](9335f0543d) Adds `ZodFirstPartyTypeKind` stub to fix module resolution failure inside `zod-to-json-schema`

### [`v4.0.3`](https://github.com/colinhacks/zod/releases/tag/v4.0.3)

[Compare Source](44a936cb77...v4.0.3)

#### Commits:

- [`5905a8d`](5905a8d810) Improve check-versions script
- [`f3e749b`](f3e749b1b0) Remove global File interface
- [`44a936c`](44a936cb77) 4.0.2
- [`74006ed`](74006edd49) Fix JSR provenance
- [`ff4af5e`](ff4af5e889) 4.0.3
- [`ce573e8`](ce573e8799) Update test badge
- [`9a7161a`](9a7161a976) Fix versions

### [`v4.0.2`](https://github.com/colinhacks/zod/compare/v4.0.1...44a936cb77961e57a0988d8a3c63d9c71fce69ac)

[Compare Source](https://github.com/colinhacks/zod/compare/v4.0.1...44a936cb77961e57a0988d8a3c63d9c71fce69ac)

### [`v4.0.1`](https://github.com/colinhacks/zod/releases/tag/v4.0.1): v4.0.0

[Compare Source](79d4d80e3b...v4.0.1)

With this release, `zod@4.0.0` has been published to `npm`. There were no code changes between 3.25.76 and 4.0.0!

Zod 4 has been stable for the past 6 weeks, but it was published inside zod@3.25.x on npm. this transitionary window gave the ecosystem time to incrementally support for Zod 4 (without dropping support for Zod 3). As there is now near-universal support for Zod 4 in the ecosystem, ths time feels right to finally put a bow on things 🎀

To upgrade to Zod 4:

```
npm upgrade zod@^4.0.0
```

If you’ve already migrated to Zod 4 using the subpaths, there are no changes required. however you can optionally simplify your imports (recommended)

```ts
// after upgrading to zod@4.0.0:
import * as z from "zod"; // Zod 4 (regular)
import * as z from "zod/mini" // Zod 4 Mini

// these still work, but are no longer needed
import * as z from "zod/v4";
import * as z from "zod/v4-mini":

// if you still need Zod 3
import * as z from "zod/v3"; // Zod 3
```

**Library authors** — if you've already implemented Zod 4 support according to the best practices outlined in the [Library authors](/library-authors) guide, bump your peer dependency to include `zod@^4.0.0`:

```json
// package.json
{
  "peerDependencies": {
    "zod": "^3.25.0 || ^4.0.0"
  }
}
```

*There should be no other code changes necessary.* No code changes were made between the latest `3.25.x` release and `4.0.0`. This does not require a major version bump.

### [`v4.0.0`](https://github.com/colinhacks/zod/compare/v3.25.76...79d4d80e3b47f04752c5c281077b53f889551441)

[Compare Source](https://github.com/colinhacks/zod/compare/v3.25.76...79d4d80e3b47f04752c5c281077b53f889551441)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "every weekend" (UTC), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MC40Ni4wIiwidXBkYXRlZEluVmVyIjoiNDEuMzEuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Co-authored-by: Felix Schulze <admin@schulze.network>
Reviewed-on: #6
Co-authored-by: Renovate Bot <renovatebot@schulze.network>
Co-committed-by: Renovate Bot <renovatebot@schulze.network>

.gitattributes

@@ -0,0 +1,2 @@
+*.png filter=lfs diff=lfs merge=lfs -text
+*.ico filter=lfs diff=lfs merge=lfs -text

.gitea/workflows/check.yml

@@ -0,0 +1,31 @@
+name: Lint
+
+on:
+  pull_request:
+  push:
+    branches:
+      - "**" # matches every branch
+
+jobs:
+  lint_and_typecheck:
+    name: Lint and Typecheck
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+
+      - name: Install pnpm
+        uses: pnpm/action-setup@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
+        with:
+          node-version: 22
+          cache: "pnpm"
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Run check
+        run: pnpm run check

README.md

@@ -1,3 +1,108 @@
-# fire
+![InvestingFIRE logo](/src/app/apple-icon.png)
 
-FIRE calculator
+# InvestingFIRE 🔥 — The #1 Interactive FIRE Calculator
+
+**InvestingFIRE** is a responsive web application for calculating your path to Financial Independence and Early Retirement (FIRE). It features a year-by-year projection engine that simulates both accumulation (savings and investment growth) and retirement (withdrawals) phases, allowing users to:
+
+- Input starting capital, monthly savings, expected annual growth rate, inflation rate, current age, desired retirement age, life expectancy, and desired monthly retirement allowance.
+- View a dynamic chart displaying projected portfolio balance and monthly allowance over time.
+- Instantly see their estimated “FIRE number” (required capital at retirement), how long their capital will last, and compare results to the “4% rule.”
+- Adjust assumptions live, with all calculations and visualizations updating automatically.
+- Access explanatory content about FIRE methodology, key variables, and additional community resources, all on a single, consolidated page.
+
+The project’s code is structured using React/Next.js with TypeScript, focusing on user experience, modern UI components, and clarity of financial assumptions.
+
+---
+
+## 🚀 Features at a Glance
+
+- **⚡️ Real-Time Projections:** Every field updates the chart _as you type_. Experiment with savings, growth rates, inflation, or retirement age and see your future instantly.
+- **📈 Interactive Chart:** Dual-area plots for portfolio value and future monthly spending, plus reference lines for FIRE milestones and “4% rule” legends.
+- **🧠 Education Baked In:** Contextual tooltips, deep-dive sections on how FIRE works, FAQs, and must-read resources included.
+- **🔎 Detailed Methodology:** Not just a 25x rule — runs a full, year-by-year simulation with inflation-adjusted withdrawals and optional 4%-rule overlays.
+- **👌 Modern UX:** Typing, sliding, or clicking feels _good_. Responsive on all devices.
+
+---
+
+## 🧰 How It Works
+
+The calculator models your FIRE journey in two phases:
+
+1. **Accumulation:**
+   - Your starting capital is grown by your expected CAGR (~7% by default).
+   - Monthly savings are added for each year until retirement.
+   - Every variable can be adjusted live (capital, savings, age, growth, inflation, spending, target retirement).
+
+2. **Retirement:**
+   - Your balance continues to grow by CAGR.
+   - Each year, an inflation-adjusted monthly allowance is withdrawn.
+   - The simulation runs until your selected life expectancy, showing the possibility of portfolio depletion.
+
+**Key Outputs:**
+
+- 🔥 “FIRE Number”: Portfolio value at your defined retirement age
+- 📊 Interactive projection chart: See how your nest egg and withdrawals evolve over time
+- 4️⃣ “4% Rule” overlays: Compare dynamic results to classic rule-of-thumb
+
+---
+
+## 🌟 Try It For Yourself
+
+To run locally:
+
+1. **Clone the repo**
+   ```bash
+   git clone https://git.schulze.network/schulze/fire.git
+   cd fire
+   ```
+2. **Install dependencies**
+   ```bash
+   pnpm install
+   ```
+3. **Run the app**
+   ```bash
+   pnpm run dev
+   ```
+4. Visit [http://localhost:3000](http://localhost:3000) and unleash the fire.
+
+Deployed version: [https://investingfire.com](https://investingfire.com)
+
+---
+
+## ✏️ Inputs & Variables
+
+- **Starting Capital** — How much you’ve already invested
+- **Monthly Savings** — What you’ll add each month
+- **Current Age & Retirement Age** — Your FI timeline
+- **Life Expectancy** — How long do you want income to last?
+- **Expected Growth Rate (CAGR)** — Portfolio annual % return, before inflation
+- **Inflation Rate** — Cost of living increases
+- **Desired Monthly Allowance** — Your lifestyle, today’s dollars
+
+As you adjust these, all projections update instantly _without needing to hit “Calculate.”_
+
+Try many “what ifs” fast.
+
+---
+
+## 👩‍💻 Contributing
+
+Pull requests are welcome! Open issues for bugs, new features, or debate about safe withdrawal rates and tax assumptions.
+
+---
+
+## 📄 License
+
+[GPL-3.0](./LICENSE)
+
+---
+
+## 🥇 Why Use InvestingFIRE?
+
+- You want the truth — not just a 4% fantasy.
+- You want to learn, not just punch in numbers.
+- You want clarity, speed, and modern UI.
+- You want to show your friends the best FIRE tool on the web.
+
+Enjoy the _rocket ride_ to financial independence.  
+**InvestingFIRE — Know your number. Change your future.**

eslint.config.js

@@ -14,7 +14,7 @@ export default tseslint.config(
     files: ["**/*.ts", "**/*.tsx"],
     extends: [
       ...tseslint.configs.recommended,
-      ...tseslint.configs.strictTypeChecked,
+      ...tseslint.configs.recommendedTypeChecked,
       ...tseslint.configs.stylisticTypeChecked,
     ],
     rules: {

package.json

@@ -9,47 +9,49 @@
     "dev": "next dev --turbo",
     "format:check": "prettier --check \"**/*.{ts,tsx,js,jsx,mdx}\" --cache",
     "format:write": "prettier --write \"**/*.{ts,tsx,js,jsx,mdx}\" --cache",
-    "lint": "next lint",
     "lint:fix": "next lint --fix",
     "preview": "next build && next start",
-    "start": "next start",
+    "start": "next start"
-    "typecheck": "tsc --noEmit"
   },
   "dependencies": {
     "@hookform/resolvers": "^5.0.1",
     "@radix-ui/react-accordion": "^1.2.8",
     "@radix-ui/react-label": "^2.1.4",
+    "@radix-ui/react-select": "^2.2.2",
+    "@radix-ui/react-slider": "^1.3.2",
     "@radix-ui/react-slot": "^1.2.0",
-    "@t3-oss/env-nextjs": "^0.12.0",
+    "@t3-oss/env-nextjs": "^0.13.0",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
-    "lucide-react": "^0.503.0",
+    "lucide-react": "^0.525.0",
     "next": "^15.2.3",
+    "next-plausible": "^3.12.4",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "react-hook-form": "^7.56.1",
-    "recharts": "^2.15.3",
+    "recharts": "^3.0.0",
     "tailwind-merge": "^3.2.0",
-    "zod": "^3.24.3"
+    "zod": "^4.0.0"
   },
   "devDependencies": {
-    "@eslint/eslintrc": "^3.3.1",
+    "@eslint/eslintrc": "3.3.1",
-    "@tailwindcss/postcss": "^4.0.15",
+    "@tailwindcss/postcss": "4.1.11",
-    "@types/node": "^20.14.10",
+    "@types/node": "22.16.3",
-    "@types/react": "^19.0.0",
+    "@types/react": "19.1.8",
-    "@types/react-dom": "^19.0.0",
+    "@types/react-dom": "19.1.6",
-    "eslint": "^9.23.0",
+    "eslint": "9.31.0",
-    "eslint-config-next": "^15.2.3",
+    "eslint-config-next": "15.3.5",
-    "postcss": "^8.5.3",
+    "eslint-plugin-react-hooks": "^5.2.0",
-    "prettier": "^3.5.3",
+    "postcss": "8.5.6",
-    "prettier-plugin-tailwindcss": "^0.6.11",
+    "prettier": "3.6.2",
-    "tailwindcss": "^4.0.15",
+    "prettier-plugin-tailwindcss": "0.6.14",
-    "tw-animate-css": "^1.2.8",
+    "tailwindcss": "4.1.11",
-    "typescript": "^5.8.2",
+    "tw-animate-css": "1.3.5",
-    "typescript-eslint": "^8.27.0"
+    "typescript": "5.8.3",
+    "typescript-eslint": "8.36.0"
   },
   "ct3aMetadata": {
     "initVersion": "7.39.3"
   },
-  "packageManager": "npm@11.2.0"
+  "packageManager": "pnpm@10.13.1"
 }

pnpm-workspace.yaml

@@ -0,0 +1,6 @@
+ignoredBuiltDependencies:
+  - unrs-resolver
+
+onlyBuiltDependencies:
+  - '@tailwindcss/oxide'
+  - sharp

public/investingfire_logo_no-bg.svg

@@ -0,0 +1 @@
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public/wgu5fuk8d5j5wp3pjtta9vrw8d9by9qk.txt

@@ -0,0 +1 @@
+wgu5fuk8d5j5wp3pjtta9vrw8d9by9qk

renovate.json

@@ -0,0 +1,11 @@
+{
+  "extends": ["config:best-practices", ":semanticCommits"],
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "packageRules": [
+    {
+      "matchUpdateTypes": ["minor", "patch", "pin", "digest"],
+      "automerge": true,
+      "automergeType": "branch"
+    }
+  ]
+}

src/app/components/BackgroundPattern.tsx

@@ -0,0 +1,157 @@
+"use client";
+import { useState, useEffect } from "react";
+import {
+  type LucideIcon,
+  HandCoins,
+  Bitcoin,
+  Coins,
+  DollarSign,
+  Euro,
+  IndianRupee,
+  JapaneseYen,
+  PiggyBank,
+  PoundSterling,
+  Wallet,
+  Banknote,
+  ChartCandlestick,
+  CirclePercent,
+  CreditCard,
+  Gem,
+  Receipt,
+  ShoppingBasket,
+  Rocket,
+  RockingChair,
+  Sparkles,
+  ChartPie,
+  ChartBar,
+  BarChart3,
+  ChartLine,
+  TrendingDown,
+  TrendingUp,
+  Vault,
+  Landmark,
+  Briefcase,
+  Handshake,
+  Shield,
+  Lock,
+  CalendarRange,
+  Hourglass,
+  Sprout,
+  Target,
+} from "lucide-react";
+
+export default function MultiIconPattern({ opacity = 0.2, spacing = 160 }) {
+  const [width, setWidth] = useState(0);
+  const [height, setHeight] = useState(0);
+  const [rows, setRows] = useState(0);
+  const [columns, setColumns] = useState(0);
+
+  useEffect(() => {
+    const updateDimensions = () => {
+      if (window.innerWidth > width + spacing * 2) {
+        setWidth(window.innerWidth);
+      }
+      if (window.innerHeight > height + spacing * 2) {
+        setHeight(window.innerHeight);
+      }
+    };
+
+    updateDimensions();
+    window.addEventListener("resize", updateDimensions);
+
+    return () => {
+      window.removeEventListener("resize", updateDimensions);
+    };
+  }, [height, width, spacing]);
+
+  useEffect(() => {
+    setColumns(Math.ceil(width / spacing) + 3);
+  }, [width, spacing]);
+
+  useEffect(() => {
+    setRows(Math.ceil(height / spacing) + 3);
+  }, [height, spacing]);
+
+  // Explicitly type the array as LucideIcon[]
+  const iconComponents: LucideIcon[] = [
+    HandCoins,
+    Bitcoin,
+    Coins,
+    DollarSign,
+    Euro,
+    IndianRupee,
+    JapaneseYen,
+    PiggyBank,
+    PoundSterling,
+    Wallet,
+    Banknote,
+    ChartCandlestick,
+    CirclePercent,
+    CreditCard,
+    Gem,
+    Receipt,
+    ShoppingBasket,
+    Rocket,
+    RockingChair,
+    Sparkles,
+    ChartPie,
+    ChartBar,
+    BarChart3,
+    ChartLine,
+    TrendingDown,
+    TrendingUp,
+    Vault,
+    Landmark,
+    Briefcase,
+    Handshake,
+    Shield,
+    Lock,
+    CalendarRange,
+    Hourglass,
+    Sprout,
+    Target,
+  ];
+
+  const renderIcons = ({
+    rows,
+    columns,
+  }: {
+    rows: number;
+    columns: number;
+  }) => {
+    const icons = [];
+    for (let y = 0; y < rows; y++) {
+      for (let x = 0; x < columns; x++) {
+        // Pick a random icon component from the array
+        const randomIndex = Math.floor(Math.random() * iconComponents.length);
+        const IconComponent = iconComponents[randomIndex]!;
+
+        // Slightly randomize size and position for more organic feel
+        const size = 28 + Math.floor(Math.random() * 8);
+        const xOffset = Math.floor(Math.random() * (spacing / 1.618));
+        const yOffset = Math.floor(Math.random() * (spacing / 1.618));
+
+        icons.push(
+          <IconComponent
+            key={`icon-${x}-${y}`}
+            size={size}
+            className="text-primary fixed"
+            style={{
+              left: `${x * spacing + xOffset}px`,
+              top: `${y * spacing + yOffset}px`,
+              opacity: opacity,
+              transform: `rotate(${Math.round((Math.random() - 0.5) * 30)}deg)`,
+            }}
+          />,
+        );
+      }
+    }
+    return icons;
+  };
+
+  return (
+    <div className="absolute h-full w-full">
+      {width > 0 && renderIcons({ rows, columns })}
+    </div>
+  );
+}

src/app/components/FireCalculatorForm.tsx

@@ -1,6 +1,5 @@
 "use client";
 
-import * as React from "react";
 import { useState } from "react";
 import { zodResolver } from "@hookform/resolvers/zod";
 import { useForm } from "react-hook-form";
@@ -8,7 +7,6 @@ import * as z from "zod";
 
 import { Button } from "@/components/ui/button";
 import { Input } from "@/components/ui/input";
-import { Label } from "@/components/ui/label";
 import {
   Form,
   FormControl,
@@ -32,17 +30,25 @@ import {
   XAxis,
   YAxis,
   ReferenceLine,
+  type TooltipProps,
 } from "recharts";
+import { Slider } from "@/components/ui/slider";
+import assert from "assert";
+import type {
+  NameType,
+  ValueType,
+} from "recharts/types/component/DefaultTooltipContent";
 
 // Schema for form validation
 const formSchema = z.object({
-  startingCapital: z.coerce
+  startingCapital: z.coerce.number(),
-    .number()
-    .min(0, "Starting capital must be a non-negative number"),
   monthlySavings: z.coerce
     .number()
     .min(0, "Monthly savings must be a non-negative number"),
-  currentAge: z.coerce.number().min(18, "Age must be at least 18"),
+  currentAge: z.coerce
+    .number()
+    .min(1, "Age must be at least 1")
+    .max(100, "No point in starting this late"),
   cagr: z.coerce.number().min(0, "Growth rate must be a non-negative number"),
   desiredMonthlyAllowance: z.coerce
     .number()
@@ -52,41 +58,79 @@ const formSchema = z.object({
     .min(0, "Inflation rate must be a non-negative number"),
   lifeExpectancy: z.coerce
     .number()
-    .min(50, "Life expectancy must be at least 50"),
+    .min(40, "Be a bit more optimistic buddy :(")
+    .max(100, "You should be more realistic..."),
+  retirementAge: z.coerce
+    .number()
+    .min(18, "Retirement age must be at least 18")
+    .max(100, "Retirement age must be at most 100"),
 });
 
 // Type for form values
 type FormValues = z.infer<typeof formSchema>;
 
-interface CalculationResult {
+interface YearlyData {
-  fireNumber: number | null;
-  retirementAge: number | null;
-  inflationAdjustedAllowance: number | null;
-  retirementYears: number | null;
-  error?: string;
-  yearlyData?: Array<{
   age: number;
   year: number;
   balance: number;
+  untouchedBalance: number;
   phase: "accumulation" | "retirement";
-  }>;
+  monthlyAllowance: number;
+  untouchedMonthlyAllowance: number;
 }
 
+interface CalculationResult {
+  fireNumber: number | null;
+  fireNumber4percent: number | null;
+  retirementAge4percent: number | null;
+  yearlyData: YearlyData[];
+  error?: string;
+}
+
+// Helper function to format currency without specific symbols
+const formatNumber = (value: number | null) => {
+  if (!value) return "N/A";
+  return new Intl.NumberFormat("en", {
+    maximumFractionDigits: 0,
+  }).format(value);
+};
+
+// Helper function to render tooltip for chart
+const tooltipRenderer = ({
+  active,
+  payload,
+}: TooltipProps<ValueType, NameType>) => {
+  if (active && payload?.[0]?.payload) {
+    const data = payload[0].payload as YearlyData;
+    return (
+      <div className="bg-background border p-2 shadow-sm">
+        <p className="font-medium">{`Year: ${data.year.toString()} (Age: ${data.age.toString()})`}</p>
+        <p className="text-orange-500">{`Balance: ${formatNumber(data.balance)}`}</p>
+        <p className="text-red-600">{`Monthly allowance: ${formatNumber(data.monthlyAllowance)}`}</p>
+        <p>{`Phase: ${data.phase === "accumulation" ? "Accumulation" : "Retirement"}`}</p>
+      </div>
+    );
+  }
+  return null;
+};
+
 export default function FireCalculatorForm() {
   const [result, setResult] = useState<CalculationResult | null>(null);
-  const currentYear = new Date().getFullYear();
+  const irlYear = new Date().getFullYear();
+  const [showing4percent, setShowing4percent] = useState(false);
 
   // Initialize form with default values
-  const form = useForm<FormValues>({
+  const form = useForm<z.input<typeof formSchema>, undefined, FormValues>({
     resolver: zodResolver(formSchema),
     defaultValues: {
       startingCapital: 50000,
       monthlySavings: 1500,
       currentAge: 25,
       cagr: 7,
-      desiredMonthlyAllowance: 2000,
+      desiredMonthlyAllowance: 3000,
-      inflationRate: 2,
+      inflationRate: 2.3,
       lifeExpectancy: 84,
+      retirementAge: 55,
     },
   });
 
@@ -95,229 +139,105 @@ export default function FireCalculatorForm() {
 
     const startingCapital = values.startingCapital;
     const monthlySavings = values.monthlySavings;
-    const currentAge = values.currentAge;
+    const age = values.currentAge;
-    const annualGrowthRate = values.cagr / 100;
+    const annualGrowthRate = 1 + values.cagr / 100;
     const initialMonthlyAllowance = values.desiredMonthlyAllowance;
-    const annualInflation = values.inflationRate / 100;
+    const annualInflation = 1 + values.inflationRate / 100;
-    const lifeExpectancy = values.lifeExpectancy;
+    const ageOfDeath = values.lifeExpectancy;
-
+    const retirementAge = values.retirementAge;
-    const monthlyGrowthRate = Math.pow(1 + annualGrowthRate, 1 / 12) - 1;
-    const monthlyInflationRate = Math.pow(1 + annualInflation, 1 / 12) - 1;
-    const maxIterations = 1000; // Safety limit for iterations
-
-    // Binary search for the required retirement capital
-    let low = initialMonthlyAllowance * 12; // Minimum: one year of expenses
-    let high = initialMonthlyAllowance * 12 * 100; // Maximum: hundred years of expenses
-    let requiredCapital = 0;
-    let retirementAge = 0;
-    let finalInflationAdjustedAllowance = 0;
-
-    // First, find when retirement is possible with accumulation phase
-    let canRetire = false;
-    let currentCapital = startingCapital;
-    let age = currentAge;
-    let monthlyAllowance = initialMonthlyAllowance;
-    let iterations = 0;
 
     // Array to store yearly data for the chart
-    const yearlyData: CalculationResult["yearlyData"] = [];
+    const yearlyData: YearlyData[] = [];
 
-    // Add starting point
+    // Initial year data
+    yearlyData.push({
+      age: age,
+      year: irlYear,
+      balance: startingCapital,
+      untouchedBalance: startingCapital,
+      phase: "accumulation",
+      monthlyAllowance: 0,
+      untouchedMonthlyAllowance: initialMonthlyAllowance,
+    });
+
+    // Calculate accumulation phase (before retirement)
+    for (let year = irlYear + 1; year <= irlYear + (ageOfDeath - age); year++) {
+      const currentAge = age + (year - irlYear);
+      const previousYearData = yearlyData[yearlyData.length - 1];
+      const inflatedAllowance =
+        initialMonthlyAllowance * Math.pow(annualInflation, year - irlYear);
+
+      const isRetirementYear = currentAge >= retirementAge;
+      const phase = isRetirementYear ? "retirement" : "accumulation";
+
+      assert(!!previousYearData);
+      // Calculate balance based on phase
+      let newBalance;
+      if (phase === "accumulation") {
+        // During accumulation: grow previous balance + add savings
+        newBalance =
+          previousYearData.balance * annualGrowthRate + monthlySavings * 12;
+      } else {
+        // During retirement: grow previous balance - withdraw allowance
+        newBalance =
+          previousYearData.balance * annualGrowthRate - inflatedAllowance * 12;
+      }
+      const untouchedBalance =
+        previousYearData.untouchedBalance * annualGrowthRate +
+        monthlySavings * 12;
+      const allowance = phase === "retirement" ? inflatedAllowance : 0;
       yearlyData.push({
         age: currentAge,
-      year: currentYear,
+        year: year,
-      balance: startingCapital,
+        balance: newBalance,
-      phase: "accumulation",
+        untouchedBalance: untouchedBalance,
-    });
+        phase: phase,
-
+        monthlyAllowance: allowance,
-    // Accumulation phase simulation
+        untouchedMonthlyAllowance: inflatedAllowance,
-    while (age < lifeExpectancy && iterations < maxIterations) {
-      // Simulate one year of saving and growth
-      for (let month = 0; month < 12; month++) {
-        currentCapital += monthlySavings;
-        currentCapital *= 1 + monthlyGrowthRate;
-        // Update allowance for inflation
-        monthlyAllowance *= 1 + monthlyInflationRate;
-      }
-      age++;
-      iterations++;
-
-      // Record yearly data
-      yearlyData.push({
-        age: age,
-        year: currentYear + (age - currentAge),
-        balance: Math.round(currentCapital),
-        phase: "accumulation",
-      });
-
-      // Check each possible retirement capital target through binary search
-      const mid = (low + high) / 2;
-      if (high - low < 1) {
-        // Binary search converged
-        requiredCapital = mid;
-        break;
-      }
-
-      // Test if this retirement capital is sufficient
-      let testCapital = mid;
-      let testAge = age;
-      let testAllowance = monthlyAllowance;
-      let isSufficient = true;
-
-      // Simulate retirement phase with this capital
-      while (testAge < lifeExpectancy) {
-        for (let month = 0; month < 12; month++) {
-          // Withdraw inflation-adjusted allowance
-          testCapital -= testAllowance;
-          // Grow remaining capital
-          testCapital *= 1 + monthlyGrowthRate;
-          // Adjust allowance for inflation
-          testAllowance *= 1 + monthlyInflationRate;
-        }
-        testAge++;
-
-        // Check if we've depleted capital before life expectancy
-        if (testCapital <= 0) {
-          isSufficient = false;
-          break;
-        }
-      }
-
-      if (isSufficient) {
-        high = mid; // This capital or less might be enough
-        if (currentCapital >= mid) {
-          // We can retire now with this capital
-          canRetire = true;
-          retirementAge = age;
-          requiredCapital = mid;
-          finalInflationAdjustedAllowance = monthlyAllowance;
-          break;
-        }
-      } else {
-        low = mid; // We need more capital
-      }
-    }
-
-    // If we didn't find retirement possible in the loop
-    if (!canRetire && iterations < maxIterations) {
-      // Continue accumulation phase until we reach sufficient capital
-      while (age < lifeExpectancy && iterations < maxIterations) {
-        // Simulate one year
-        for (let month = 0; month < 12; month++) {
-          currentCapital += monthlySavings;
-          currentCapital *= 1 + monthlyGrowthRate;
-          monthlyAllowance *= 1 + monthlyInflationRate;
-        }
-        age++;
-        iterations++;
-
-        // Record yearly data
-        yearlyData.push({
-          age: age,
-          year: currentYear + (age - currentAge),
-          balance: Math.round(currentCapital),
-          phase: "accumulation",
-        });
-
-        // Test with current capital
-        let testCapital = currentCapital;
-        let testAge = age;
-        let testAllowance = monthlyAllowance;
-        let isSufficient = true;
-
-        // Simulate retirement with current capital
-        while (testAge < lifeExpectancy) {
-          for (let month = 0; month < 12; month++) {
-            testCapital -= testAllowance;
-            testCapital *= 1 + monthlyGrowthRate;
-            testAllowance *= 1 + monthlyInflationRate;
-          }
-          testAge++;
-
-          if (testCapital <= 0) {
-            isSufficient = false;
-            break;
-          }
-        }
-
-        if (isSufficient) {
-          canRetire = true;
-          retirementAge = age;
-          requiredCapital = currentCapital;
-          finalInflationAdjustedAllowance = monthlyAllowance;
-          break;
-        }
-      }
-    }
-
-    // If retirement is possible, simulate the retirement phase for the chart
-    if (canRetire) {
-      // Update the phase for all years after retirement
-      yearlyData.forEach((data) => {
-        if (data.age >= retirementAge) {
-          data.phase = "retirement";
-        }
-      });
-
-      // Continue simulation for retirement phase if needed
-      let simulationCapital = currentCapital;
-      let simulationAllowance = monthlyAllowance;
-      let simulationAge = age;
-
-      // If we haven't simulated up to life expectancy, continue
-      while (simulationAge < lifeExpectancy) {
-        for (let month = 0; month < 12; month++) {
-          simulationCapital -= simulationAllowance;
-          simulationCapital *= 1 + monthlyGrowthRate;
-          simulationAllowance *= 1 + monthlyInflationRate;
-        }
-        simulationAge++;
-
-        // Record yearly data
-        yearlyData.push({
-          age: simulationAge,
-          year: currentYear + (simulationAge - currentAge),
-          balance: Math.round(simulationCapital),
-          phase: "retirement",
       });
     }
-    }
 
-    if (canRetire) {
+    // Calculate FIRE number at retirement
-      setResult({
+    const retirementYear = irlYear + (retirementAge - age);
-        fireNumber: requiredCapital,
+    const retirementIndex = yearlyData.findIndex(
-        retirementAge: retirementAge,
+      (data) => data.year === retirementYear,
-        inflationAdjustedAllowance: finalInflationAdjustedAllowance,
+    );
-        retirementYears: lifeExpectancy - retirementAge,
+    const retirementData = yearlyData[retirementIndex];
-        yearlyData: yearlyData,
+
-        error: undefined,
+    const [fireNumber4percent, retirementAge4percent] = (() => {
-      });
+      for (const yearData of yearlyData) {
-    } else {
+        if (
+          yearData.untouchedBalance >
+          (yearData.untouchedMonthlyAllowance * 12) / 0.04
+        ) {
+          return [yearData.untouchedBalance, yearData.age];
+        }
+      }
+      return [0, 0];
+    })();
+
+    if (retirementIndex === -1 || !retirementData) {
       setResult({
         fireNumber: null,
-        retirementAge: null,
+        fireNumber4percent: null,
-        inflationAdjustedAllowance: null,
+        retirementAge4percent: null,
-        retirementYears: null,
+        error: "Could not calculate retirement data",
+        yearlyData: yearlyData,
+      });
+    } else {
+      // Set the result
+      setResult({
+        fireNumber: retirementData.balance,
+        fireNumber4percent: fireNumber4percent,
+        retirementAge4percent: retirementAge4percent,
         yearlyData: yearlyData,
-        error:
-          iterations >= maxIterations
-            ? "Calculation exceeded maximum iterations."
-            : "Cannot reach FIRE goal before life expectancy with current parameters.",
       });
     }
   }
 
-  // Helper function to format currency without specific symbols
-  const formatNumber = (value: number | null) => {
-    if (value === null) return "N/A";
-    return new Intl.NumberFormat("en", {
-      maximumFractionDigits: 0,
-    }).format(value);
-  };
-
   return (
-    <div className="w-full max-w-3xl">
+    <>
-      <Card className="mb-8">
+      <Card className="mb-4">
         <CardHeader>
           <CardTitle className="text-2xl">FIRE Calculator</CardTitle>
           <CardDescription>
@@ -338,7 +258,18 @@ export default function FireCalculatorForm() {
                         <Input
                           placeholder="e.g., 10000"
                           type="number"
-                          {...field}
+                          value={field.value as number | string | undefined}
+                          onChange={(e) => {
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
+                            void form.handleSubmit(onSubmit)();
+                          }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
                         />
                       </FormControl>
                       <FormMessage />
@@ -355,7 +286,18 @@ export default function FireCalculatorForm() {
                         <Input
                           placeholder="e.g., 500"
                           type="number"
-                          {...field}
+                          value={field.value as number | string | undefined}
+                          onChange={(e) => {
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
+                            void form.handleSubmit(onSubmit)();
+                          }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
                         />
                       </FormControl>
                       <FormMessage />
@@ -372,7 +314,46 @@ export default function FireCalculatorForm() {
                         <Input
                           placeholder="e.g., 30"
                           type="number"
-                          {...field}
+                          value={field.value as number | string | undefined}
+                          onChange={(e) => {
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
+                            void form.handleSubmit(onSubmit)();
+                          }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
+                        />
+                      </FormControl>
+                      <FormMessage />
+                    </FormItem>
+                  )}
+                />
+                <FormField
+                  control={form.control}
+                  name="lifeExpectancy"
+                  render={({ field }) => (
+                    <FormItem>
+                      <FormLabel>Life Expectancy (Age)</FormLabel>
+                      <FormControl>
+                        <Input
+                          placeholder="e.g., 90"
+                          type="number"
+                          value={field.value as number | string | undefined}
+                          onChange={(e) => {
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
+                            void form.handleSubmit(onSubmit)();
+                          }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
                         />
                       </FormControl>
                       <FormMessage />
@@ -390,7 +371,47 @@ export default function FireCalculatorForm() {
                           placeholder="e.g., 7"
                           type="number"
                           step="0.1"
-                          {...field}
+                          value={field.value as number | string | undefined}
+                          onChange={(e) => {
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
+                            void form.handleSubmit(onSubmit)();
+                          }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
+                        />
+                      </FormControl>
+                      <FormMessage />
+                    </FormItem>
+                  )}
+                />
+                <FormField
+                  control={form.control}
+                  name="inflationRate"
+                  render={({ field }) => (
+                    <FormItem>
+                      <FormLabel>Annual Inflation Rate (%)</FormLabel>
+                      <FormControl>
+                        <Input
+                          placeholder="e.g., 2"
+                          type="number"
+                          step="0.1"
+                          value={field.value as number | string | undefined}
+                          onChange={(e) => {
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
+                            void form.handleSubmit(onSubmit)();
+                          }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
                         />
                       </FormControl>
                       <FormMessage />
@@ -409,42 +430,46 @@ export default function FireCalculatorForm() {
                         <Input
                           placeholder="e.g., 2000"
                           type="number"
-                          {...field}
+                          value={field.value as number | string | undefined}
+                          onChange={(e) => {
+                            field.onChange(
+                              e.target.value === ""
+                                ? undefined
+                                : Number(e.target.value),
+                            );
+                            void form.handleSubmit(onSubmit)();
+                          }}
+                          onBlur={field.onBlur}
+                          name={field.name}
+                          ref={field.ref}
                         />
                       </FormControl>
                       <FormMessage />
                     </FormItem>
                   )}
                 />
+
+                {/* Retirement Age Slider */}
                 <FormField
                   control={form.control}
-                  name="inflationRate"
+                  name="retirementAge"
                   render={({ field }) => (
                     <FormItem>
-                      <FormLabel>Annual Inflation Rate (%)</FormLabel>
+                      <FormLabel>
+                        Retirement Age: {field.value as number}
+                      </FormLabel>
                       <FormControl>
-                        <Input
+                        <Slider
-                          placeholder="e.g., 2"
+                          name="retirementAge"
-                          type="number"
+                          value={[field.value as number]}
-                          step="0.1"
+                          min={25}
-                          {...field}
+                          max={75}
-                        />
+                          step={1}
-                      </FormControl>
+                          onValueChange={(value: number[]) => {
-                      <FormMessage />
+                            field.onChange(value[0]);
-                    </FormItem>
+                            void form.handleSubmit(onSubmit)();
-                  )}
+                          }}
-                />
+                          className="py-4"
-                <FormField
-                  control={form.control}
-                  name="lifeExpectancy"
-                  render={({ field }) => (
-                    <FormItem>
-                      <FormLabel>Life Expectancy (Age)</FormLabel>
-                      <FormControl>
-                        <Input
-                          placeholder="e.g., 90"
-                          type="number"
-                          {...field}
                         />
                       </FormControl>
                       <FormMessage />
@@ -453,85 +478,27 @@ export default function FireCalculatorForm() {
                 />
               </div>
 
+              {!result && (
                 <Button type="submit" className="w-full">
                   Calculate
                 </Button>
-            </form>
-          </Form>
-        </CardContent>
-      </Card>
-
-      {result && (
-        <>
-          <Card className="mb-8">
-            <CardHeader>
-              <CardTitle>Results</CardTitle>
-            </CardHeader>
-            <CardContent>
-              {result.error ? (
-                <p className="text-destructive">{result.error}</p>
-              ) : (
-                <div className="space-y-4">
-                  <div>
-                    <Label>FIRE Number (Required Capital)</Label>
-                    <p className="text-2xl font-bold">
-                      {formatNumber(result.fireNumber)}
-                    </p>
-                  </div>
-                  <div>
-                    <Label>Estimated Retirement Age</Label>
-                    <p className="text-2xl font-bold">
-                      {result.retirementAge ?? "N/A"}
-                    </p>
-                  </div>
-                  {result.inflationAdjustedAllowance && (
-                    <div>
-                      <Label>
-                        Monthly Allowance at Retirement (Inflation Adjusted)
-                      </Label>
-                      <p className="text-2xl font-bold">
-                        {formatNumber(result.inflationAdjustedAllowance)}
-                      </p>
-                    </div>
               )}
-                  {result.retirementYears && (
+              {result?.yearlyData && (
-                    <div>
+                <Card className="rounded-md shadow-none">
-                      <Label>Retirement Duration (Years)</Label>
-                      <p className="text-2xl font-bold">
-                        {result.retirementYears}
-                      </p>
-                    </div>
-                  )}
-                </div>
-              )}
-            </CardContent>
-          </Card>
-
-          {result && result.yearlyData && result.yearlyData.length > 0 && (
-            <Card>
                   <CardHeader>
                     <CardTitle>Financial Projection</CardTitle>
                     <CardDescription>
-                  Projected balance growth and FIRE number threshold
+                      Projected balance growth with your selected retirement age
                     </CardDescription>
                   </CardHeader>
-              <CardContent>
+                  <CardContent className="px-2">
                     <ChartContainer
-                  className="h-80"
+                      className="aspect-auto h-80 w-full"
-                  config={{
+                      config={{}}
-                    balance: {
-                      label: "Balance",
-                      color: "var(--chart-1)",
-                    },
-                    fireNumber: {
-                      label: "FIRE Number",
-                      color: "var(--chart-3)",
-                    },
-                  }}
                     >
                       <AreaChart
                         data={result.yearlyData}
-                    margin={{ top: 20, right: 30, left: 20, bottom: 20 }}
+                        margin={{ top: 10, right: 20, left: 20, bottom: 10 }}
                       >
                         <CartesianGrid strokeDasharray="3 3" />
                         <XAxis
@@ -542,36 +509,42 @@ export default function FireCalculatorForm() {
                             offset: -10,
                           }}
                         />
+                        {/* Right Y axis */}
                         <YAxis
+                          yAxisId={"right"}
+                          orientation="right"
                           tickFormatter={(value: number) => {
                             if (value >= 1000000) {
-                          return `${(value / 1000000).toFixed(1)}M`;
+                              return `${(value / 1000000).toPrecision(3)}M`;
                             } else if (value >= 1000) {
-                          return `${(value / 1000).toFixed(0)}K`;
+                              return `${(value / 1000).toPrecision(3)}K`;
+                            } else if (value <= -1000000) {
+                              return `${(value / 1000000).toPrecision(3)}M`;
+                            } else if (value <= -1000) {
+                              return `${(value / 1000).toPrecision(3)}K`;
                             }
-                        return `${value}`;
+                            return value.toString();
                           }}
-                      width={80}
+                          width={30}
+                          stroke="var(--color-orange-500)"
+                          tick={{}}
                         />
-                    <ChartTooltip
+                        {/* Left Y axis */}
-                      content={({ active, payload }) => {
+                        <YAxis
-                        if (active && payload?.[0]?.payload) {
+                          yAxisId="left"
-                          const data = payload[0]
+                          orientation="left"
-                            .payload as (typeof result.yearlyData)[0];
+                          tickFormatter={(value: number) => {
-                          return (
+                            if (value >= 1000000) {
-                            <div className="bg-background border p-2 shadow-sm">
+                              return `${(value / 1000000).toPrecision(3)}M`;
-                              <p className="font-medium">{`Year: ${data.year} (Age: ${data.age})`}</p>
+                            } else if (value >= 1000) {
-                              <p className="text-primary">{`Balance: ${formatNumber(data.balance)}`}</p>
+                              return `${(value / 1000).toPrecision(3)}K`;
-                              {result.fireNumber && (
-                                <p className="text-destructive">{`FIRE Number: ${formatNumber(result.fireNumber)}`}</p>
-                              )}
-                              <p>{`Phase: ${data.phase === "accumulation" ? "Accumulation" : "Retirement"}`}</p>
-                            </div>
-                          );
                             }
-                        return null;
+                            return value.toString();
                           }}
+                          width={30}
+                          stroke="var(--color-red-600)"
                         />
+                        <ChartTooltip content={tooltipRenderer} />
                         <defs>
                           <linearGradient
                             id="fillBalance"
@@ -582,12 +555,12 @@ export default function FireCalculatorForm() {
                           >
                             <stop
                               offset="5%"
-                          stopColor="var(--chart-1)"
+                              stopColor="var(--color-orange-500)"
                               stopOpacity={0.8}
                             />
                             <stop
                               offset="95%"
-                          stopColor="var(--chart-1)"
+                              stopColor="var(--color-orange-500)"
                               stopOpacity={0.1}
                             />
                           </linearGradient>
@@ -596,35 +569,76 @@ export default function FireCalculatorForm() {
                           type="monotone"
                           dataKey="balance"
                           name="balance"
-                      stroke="var(--chart-1)"
+                          stroke="var(--color-orange-500)"
                           fill="url(#fillBalance)"
-                      fillOpacity={0.4}
+                          fillOpacity={0.9}
                           activeDot={{ r: 6 }}
+                          yAxisId={"right"}
+                          stackId={"a"}
+                        />
+                        <Area
+                          type="step"
+                          dataKey="monthlyAllowance"
+                          name="allowance"
+                          stroke="var(--color-red-600)"
+                          fill="none"
+                          activeDot={{ r: 6 }}
+                          yAxisId="left"
                         />
                         {result.fireNumber && (
                           <ReferenceLine
                             y={result.fireNumber}
-                        stroke="var(--chart-3)"
+                            stroke="var(--primary)"
                             strokeWidth={2}
-                        strokeDasharray="5 5"
+                            strokeDasharray="2 1"
                             label={{
                               value: "FIRE Number",
                               position: "insideBottomRight",
                             }}
+                            yAxisId={"right"}
+                          />
+                        )}
+                        {result.fireNumber4percent && showing4percent && (
+                          <ReferenceLine
+                            y={result.fireNumber4percent}
+                            stroke="var(--secondary)"
+                            strokeWidth={1}
+                            strokeDasharray="1 1"
+                            label={{
+                              value: "4%-Rule FIRE Number",
+                              position: "insideBottomLeft",
+                            }}
+                            yAxisId={"right"}
                           />
                         )}
-                    {result.retirementAge && (
                         <ReferenceLine
                           x={
-                          currentYear +
+                            irlYear +
-                          (result.retirementAge - form.getValues().currentAge)
+                            (Number(form.getValues("retirementAge")) -
+                              Number(form.getValues("currentAge")))
                           }
-                        stroke="var(--chart-2)"
+                          stroke="var(--primary)"
                           strokeWidth={2}
                           label={{
                             value: "Retirement",
                             position: "insideTopRight",
                           }}
+                          yAxisId={"left"}
+                        />
+                        {result.retirementAge4percent && showing4percent && (
+                          <ReferenceLine
+                            x={
+                              irlYear +
+                              (result.retirementAge4percent -
+                                Number(form.getValues("currentAge")))
+                            }
+                            stroke="var(--secondary)"
+                            strokeWidth={1}
+                            label={{
+                              value: "4%-Rule Retirement",
+                              position: "insideBottomLeft",
+                            }}
+                            yAxisId={"left"}
                           />
                         )}
                       </AreaChart>
@@ -632,8 +646,96 @@ export default function FireCalculatorForm() {
                   </CardContent>
                 </Card>
               )}
+              {result && (
+                <Button
+                  onClick={() => setShowing4percent(!showing4percent)}
+                  variant={showing4percent ? "secondary" : "default"}
+                  size={"sm"}
+                >
+                  {showing4percent ? "Hide" : "Show"} 4%-Rule
+                </Button>
+              )}
+            </form>
+          </Form>
+        </CardContent>
+      </Card>
+
+      {result && (
+        <div className="mb-4 grid grid-cols-1 gap-2 md:grid-cols-2">
+          {result.error ? (
+            <Card className="col-span-full">
+              <CardContent className="pt-6">
+                <p className="text-destructive">{result.error}</p>
+              </CardContent>
+            </Card>
+          ) : (
+            <>
+              <Card>
+                <CardHeader>
+                  <CardTitle>FIRE Number</CardTitle>
+                  <CardDescription className="text-xs">
+                    Capital at retirement
+                  </CardDescription>
+                </CardHeader>
+                <CardContent>
+                  <p className="text-3xl font-bold">
+                    {formatNumber(result.fireNumber)}
+                  </p>
+                </CardContent>
+              </Card>
+
+              <Card>
+                <CardHeader>
+                  <CardTitle>Retirement Duration</CardTitle>
+                  <CardDescription className="text-xs">
+                    Years to enjoy your financial independence
+                  </CardDescription>
+                </CardHeader>
+                <CardContent>
+                  <p className="text-3xl font-bold">
+                    {Number(form.getValues("lifeExpectancy")) -
+                      Number(form.getValues("retirementAge"))}
+                  </p>
+                </CardContent>
+              </Card>
+              {showing4percent && (
+                <>
+                  <Card>
+                    <CardHeader>
+                      <CardTitle>4%-Rule FIRE Number</CardTitle>
+                      <CardDescription className="text-xs">
+                        Capital needed for 4% of it to be greater than your
+                        yearly allowance
+                      </CardDescription>
+                    </CardHeader>
+                    <CardContent>
+                      <p className="text-3xl font-bold">
+                        {formatNumber(result.fireNumber4percent)}
+                      </p>
+                    </CardContent>
+                  </Card>
+
+                  <Card>
+                    <CardHeader>
+                      <CardTitle>4%-Rule Retirement Duration</CardTitle>
+                      <CardDescription className="text-xs">
+                        Years to enjoy your financial independence if you follow
+                        the 4% rule
+                      </CardDescription>
+                    </CardHeader>
+                    <CardContent>
+                      <p className="text-3xl font-bold">
+                        {Number(form.getValues("lifeExpectancy")) -
+                          (result.retirementAge4percent ?? 0)}
+                      </p>
+                    </CardContent>
+                  </Card>
+                </>
+              )}
             </>
           )}
         </div>
+      )}
+    </>
   );
 }

src/app/components/footer.tsx

@@ -0,0 +1,16 @@
+export default function Footer() {
+  return (
+    <footer className="w-full py-8 text-center text-xs">
+      <p className="text-xs">
+        © {new Date().getFullYear()} InvestingFIRE. All rights reserved.{" "}
+        <a
+          href="https://schulze.network"
+          target="_blank"
+          className="text-primary hover:underline"
+        >
+          Hosting by Schulze.network
+        </a>
+      </p>
+    </footer>
+  );
+}

src/app/components/web-vitals.tsx

@@ -0,0 +1,77 @@
+"use client";
+
+import { usePlausible } from "next-plausible";
+import { useReportWebVitals } from "next/web-vitals";
+interface Metric {
+  /**
+   * The name of the metric (in acronym form).
+   */
+  name: "CLS" | "FCP" | "FID" | "INP" | "LCP" | "TTFB";
+
+  /**
+   * The current value of the metric.
+   */
+  value: number;
+
+  /**
+   * The rating as to whether the metric value is within the "good",
+   * "needs improvement", or "poor" thresholds of the metric.
+   */
+  rating: "good" | "needs-improvement" | "poor";
+
+  /**
+   * The delta between the current value and the last-reported value.
+   * On the first report, `delta` and `value` will always be the same.
+   */
+  delta: number;
+
+  /**
+   * A unique ID representing this particular metric instance. This ID can
+   * be used by an analytics tool to dedupe multiple values sent for the same
+   * metric instance, or to group multiple deltas together and calculate a
+   * total. It can also be used to differentiate multiple different metric
+   * instances sent from the same page, which can happen if the page is
+   * restored from the back/forward cache (in that case new metrics object
+   * get created).
+   */
+  id: string;
+
+  /**
+   * Any performance entries relevant to the metric value calculation.
+   * The array may also be empty if the metric value was not based on any
+   * entries (e.g. a CLS value of 0 given no layout shifts).
+   */
+  entries: PerformanceEntry[];
+
+  /**
+   * The type of navigation.
+   *
+   * This will be the value returned by the Navigation Timing API (or
+   * `undefined` if the browser doesn't support that API), with the following
+   * exceptions:
+   * - 'back-forward-cache': for pages that are restored from the bfcache.
+   * - 'back_forward' is renamed to 'back-forward' for consistency.
+   * - 'prerender': for pages that were prerendered.
+   * - 'restore': for pages that were discarded by the browser and then
+   * restored by the user.
+   */
+  navigationType:
+    | "navigate"
+    | "reload"
+    | "back-forward"
+    | "back-forward-cache"
+    | "prerender"
+    | "restore";
+}
+
+export function WebVitals() {
+  const plausible = usePlausible();
+  useReportWebVitals((metric: Metric) => {
+    plausible("web-vitals", {
+      props: {
+        [metric.name]: metric.rating,
+      },
+    });
+  });
+  return <></>;
+}

src/app/icon0.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" width="1000" height="1000" viewBox="0 0 264.58 264.58"><defs><linearGradient id="b"><stop offset="0" stop-color="#fd8315"/><stop offset="1" stop-color="#fa6b14"/></linearGradient><linearGradient id="a"><stop offset="0" stop-color="#f24b1b"/><stop offset="1" stop-color="#dc2f12"/></linearGradient><linearGradient xlink:href="#a" id="d" x1="172.49" x2="179.1" y1="64.48" y2="197.19" gradientUnits="userSpaceOnUse"/><linearGradient xlink:href="#b" id="c" x1="118.9" x2="117.99" y1="14.21" y2="194.34" gradientUnits="userSpaceOnUse"/></defs><rect width="264.58" height="264.58" fill="#fdf2e4" ry="42.08" style="-inkscape-stroke:none"/><g stroke-linecap="round" stroke-linejoin="round" stroke-width=".13"><path fill="url(#c)" stroke="#f14a1b" d="m115.13 9.96-.26.01c-.97.11-1.29 1.02-.75 2.38a45.6 45.6 0 0 1 3.02 15.68c-.09 8.46.04 12.87-7.31 23.68s-23.16 21.9-33.96 34.66c-10.8 12.76-12.28 16.6-16.1 26.2A90.42 90.42 0 0 0 53.05 146c0 41.29 27.68 76.09 65.49 86.91 35.3-25.9 55.47-125.62 55.47-125.62s-14.45-10.54-18.57-18.89c-1.26-2.56-1.97-6.15-1.97-9.58.01-2.54 1.3-8.72 1.47-9.41a42.4 42.4 0 0 0 .94-12.14c-.07-.95-.17-1.9-.3-2.84v-.01a59.45 59.45 0 0 0-7.6-19h0a60.34 60.34 0 0 0-10.24-12.13 66.97 66.97 0 0 0-21.7-13.15 2.94 2.94 0 0 0-.92-.18z"/><path fill="url(#d)" stroke="#510a0c" d="M170.01 58.08a66.66 66.66 0 0 0-10.24 15.94 66.66 66.66 0 0 0-6.3 27.82 66.8 66.8 0 0 0 3.66 20.86h-.08l7.08 105.8s37.38-25.1 45.9-61a74.13 74.13 0 0 0 2.04-25.93c-1.34-14.35-4.35-21.67-9.85-30.3-5.5-8.62-10.36-14-17.63-22.78-6.17-7.43-9.44-18.25-10.39-28.87-.28-3.13-2.13-3.91-4.19-1.54z"/></g><path fill="#510a0c" d="M93.45 115.81h77.91c9.81 0 17.71 7.9 17.71 17.7v104.53c0 9.81-7.9 17.71-17.7 17.71H93.44c-9.81 0-17.71-7.9-17.71-17.7V133.51c0-9.81 7.9-17.71 17.7-17.71z"/><path fill="#e83c1b" d="M91.95 163.12h29.23c3.7 0 6.68 2.98 6.68 6.68v24.8c0 3.7-2.98 6.68-6.68 6.68H91.95a6.67 6.67 0 0 1-6.68-6.68v-24.8c0-3.7 2.98-6.68 6.68-6.68zm0 45.92h29.23c3.7 0 6.68 2.98 6.68 6.68v24.8c0 3.7-2.98 6.68-6.68 6.68H91.95a6.67 6.67 0 0 1-6.68-6.69v-24.8c0-3.7 2.98-6.67 6.68-6.67zm51.25-45.92h29.23c3.7 0 6.68 2.98 6.68 6.68v24.8c0 3.7-2.98 6.68-6.68 6.68H143.2a6.67 6.67 0 0 1-6.68-6.68v-24.8c0-3.7 2.98-6.68 6.68-6.68zm0 45.92h29.23c3.7 0 6.68 2.98 6.68 6.68v24.8c0 3.7-2.98 6.68-6.68 6.68H143.2a6.67 6.67 0 0 1-6.68-6.69v-24.8c0-3.7 2.98-6.67 6.68-6.67z"/><g fill="#520a0c"><path d="M148.74 179.98h18.29a2.41 2.41 0 1 1 0 4.84h-18.29a2.41 2.41 0 1 1 0-4.84zm-51.54.04h18.29a2.41 2.41 0 1 1 0 4.83h-18.3a2.41 2.41 0 1 1 0-4.83z"/><path d="M108.76 173.3v18.28a2.41 2.41 0 1 1-4.84 0V173.3a2.41 2.41 0 1 1 4.84 0zm-10.59 59.18 12.93-12.93a2.41 2.41 0 1 1 3.42 3.42l-12.93 12.93a2.41 2.41 0 1 1-3.42-3.42z"/><path d="m101.59 219.55 12.93 12.93a2.41 2.41 0 1 1-3.42 3.42l-12.93-12.93a2.41 2.41 0 1 1 3.42-3.42zm47.15 1.49h18.29a2.41 2.41 0 1 1 0 4.84h-18.29a2.41 2.41 0 1 1 0-4.84zm0 10.73h18.29a2.41 2.41 0 1 1 0 4.84h-18.29a2.41 2.41 0 1 1 0-4.84z"/></g><path fill="#fcf2e4" d="M92.35 125.2h79.67a7.07 7.07 0 0 1 7.09 7.1v14.36a7.07 7.07 0 0 1-7.09 7.1H92.35a7.07 7.07 0 0 1-7.08-7.1V132.3a7.07 7.07 0 0 1 7.08-7.09z"/></svg>

src/app/layout.tsx

@@ -1,14 +1,17 @@
 import "@/styles/globals.css";
-
+import PlausibleProvider from "next-plausible";
-import { type Metadata } from "next";
+import { type Metadata, type Viewport } from "next";
 import { Geist } from "next/font/google";
+import { WebVitals } from "./components/web-vitals";
+
+export const viewport: Viewport = {
+  themeColor: [{ color: "oklch(0.97 0.0228 95.96)" }],
+};
 
 export const metadata: Metadata = {
-  title:
+  title: "InvestingFIRE | Finance and Retirement Calculator",
-    "FIRE Calculator - Plan Your Financial Independence & Early Retirement",
   description:
-    "Calculate your FIRE number, estimate your retirement age, and plan your path to financial independence with this comprehensive FIRE calculator.",
+    "Achieve Financial Independence & Early Retirement! Plan your FIRE journey with the InvestingFIRE calculator and get personalized projections in buttersmooth graphs.",
-  icons: [{ rel: "icon", url: "/favicon.ico" }],
 };
 
 const geist = Geist({
@@ -21,6 +24,17 @@ export default function RootLayout({
 }: Readonly<{ children: React.ReactNode }>) {
   return (
     <html lang="en" className={geist.variable}>
+      <head>
+        <meta name="apple-mobile-web-app-title" content="FIRE" />
+        <PlausibleProvider
+          domain="investingfire.com"
+          customDomain="https://analytics.schulze.network"
+          selfHosted={true}
+          enabled={true}
+          trackOutboundLinks={true}
+        />
+      </head>
+      <WebVitals />
       <body>{children}</body>
     </html>
   );

src/app/manifest.json

@@ -0,0 +1,21 @@
+{
+  "name": "InvestingFIRE",
+  "short_name": "FIRE",
+  "icons": [
+    {
+      "src": "/web-app-manifest-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "maskable"
+    },
+    {
+      "src": "/web-app-manifest-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "maskable"
+    }
+  ],
+  "theme_color": "#fdf2e4",
+  "background_color": "#fdf2e4",
+  "display": "standalone"
+}

src/app/page.tsx

@@ -1,3 +1,4 @@
+import Image from "next/image";
 import FireCalculatorForm from "./components/FireCalculatorForm";
 import {
   Accordion,
@@ -5,175 +6,235 @@ import {
   AccordionItem,
   AccordionTrigger,
 } from "@/components/ui/accordion";
+import Footer from "./components/footer";
+import BackgroundPattern from "./components/BackgroundPattern";
 
 export default function HomePage() {
   return (
-    <main className="text-primary-foreground to-destructive from-secondary flex min-h-screen flex-col items-center bg-gradient-to-b p-4">
+    <main className="text-primary-foreground to-destructive from-secondary flex min-h-screen flex-col items-center bg-gradient-to-b p-2">
-      <div className="container mx-auto flex flex-col items-center justify-center gap-12 px-4 py-16">
+      <BackgroundPattern />
-        <h1 className="text-primary-foreground text-5xl font-extrabold tracking-tight sm:text-[5rem]">
+      <div className="z-10 mx-auto flex flex-col items-center justify-center gap-4 text-center">
-          FIRE Calculator
+        <div className="mt-8 flex flex-row flex-wrap items-center justify-center gap-4 align-middle">
+          <Image
+            priority
+            unoptimized
+            src="/investingfire_logo_no-bg.svg"
+            alt="InvestingFIRE Logo"
+            width={100}
+            height={100}
+          />
+          <h1 className="from-primary via-primary-foreground to-primary bg-gradient-to-r bg-clip-text text-5xl font-extrabold tracking-tight text-transparent drop-shadow-md sm:text-[5rem]">
+            InvestingFIRE
           </h1>
+        </div>
+        <p className="text-primary-foreground/90 text-xl font-semibold md:text-2xl">
+          The #1 FIRE Calculator
+        </p>
+        <div className="mt-8 w-full max-w-2xl">
           <FireCalculatorForm />
         </div>
+      </div>
 
       {/* Added SEO Content Sections */}
-      <div className="container mx-auto max-w-4xl px-4 py-8 text-left">
+      <div className="z-10 mx-auto max-w-2xl py-12 text-left">
         <section className="mb-12">
-          <h2 className="mb-4 text-3xl font-bold">What is FIRE?</h2>
+          <h2 className="mb-4 text-3xl font-bold">
+            What Is FIRE? Understanding Financial Independence and Early
+            Retirement
+          </h2>
           <p className="mb-4 text-lg leading-relaxed">
-            FIRE stands for &quot;Financial Independence, Retire Early.&quot;
+            FIRE stands for{" "}
-            It&apos;s a movement focused on aggressive saving and investing to
+            <strong>Financial Independence, Retire Early</strong>. It&apos;s a
-            build a large enough portfolio that the returns can cover living
+            lifestyle movement built around two core ideas:
-            expenses indefinitely. Achieving FIRE means you are no longer
-            dependent on traditional employment to fund your lifestyle, giving
-            you the freedom to pursue passions, travel, or simply enjoy life
-            without the need for a regular paycheck.
-          </p>
-          <p className="text-lg leading-relaxed">
-            The core principle often involves saving a high percentage of income
-            (sometimes 50% or more) and investing it wisely, typically in
-            low-cost index funds. The target amount, often called the &quot;FIRE
-            number,&quot; is usually calculated as 25 times your desired annual
-            spending, based on the 4% safe withdrawal rate rule.
-          </p>
-        </section>
-
-        <section className="mb-12">
-          <h2 className="mb-4 text-3xl font-bold">How This Calculator Works</h2>
-          <p className="mb-4 text-lg leading-relaxed">
-            This calculator helps you estimate your path to FIRE based on your
-            current financial situation and future projections. Here&apos;s a
-            breakdown of the inputs:
           </p>
           <ul className="mb-4 ml-6 list-disc space-y-2 text-lg">
             <li>
-              <strong>Starting Capital:</strong> The total amount you currently
+              <strong>Aggressive saving & investing</strong>—often 50%+ of
-              have invested.
+              income—so your capital grows rapidly.
             </li>
             <li>
-              <strong>Monthly Savings:</strong> The amount you consistently save
+              <strong>Passive-income coverage</strong>—when your investment
-              and invest each month.
+              returns exceed your living expenses, you gain freedom from a
-            </li>
+              traditional 9-5.
-            <li>
-              <strong>Current Age:</strong> Your current age in years.
-            </li>
-            <li>
-              <strong>Expected Annual Growth Rate (%):</strong> The average
-              annual return you expect from your investments (after fees, before
-              inflation).
-            </li>
-            <li>
-              <strong>Desired Monthly Allowance (Today&apos;s Value):</strong>{" "}
-              How much you want to be able to spend each month in retirement, in
-              today&apos;s money value.
-            </li>
-            <li>
-              <strong>Annual Inflation Rate (%):</strong> The expected average
-              rate at which the cost of living will increase.
-            </li>
-            <li>
-              <strong>Life Expectancy (Age):</strong> The age until which you
-              want your funds to last.
             </li>
           </ul>
           <p className="text-lg leading-relaxed">
-            The calculator simulates your investment growth year by year,
+            By reaching your personal <em>FIRE Number</em>—the nest egg needed
-            factoring in monthly contributions, compound growth, and
+            to cover your inflation-adjusted spending—you unlock the option to
-            inflation&apos;s effect on your target allowance. It then determines
+            step away from a daily paycheck and pursue passion projects, travel,
-            the age at which your accumulated capital is sufficient to sustain
+            family, or anything else. This calculator helps you simulate your
-            your desired, inflation-adjusted monthly allowance throughout your
+            journey, estimate how much you need, and visualize both your
-            expected retirement years until your specified life expectancy. It
+            accumulation phase and your retirement withdrawals over time.
-            estimates your &quot;FIRE Number&quot; (the capital needed at
-            retirement) and the age you might reach it.
           </p>
         </section>
 
         <section className="mb-12">
           <h2 className="mb-4 text-3xl font-bold">
-            Frequently Asked Questions (FAQ)
+            How This FIRE Calculator Provides Investing Insights
+          </h2>
+          <p className="mb-4 text-lg leading-relaxed">
+            Our interactive tool goes beyond a simple “25x annual spending”
+            rule. It runs a <strong>year-by-year simulation</strong> of your
+            portfolio, combining:
+          </p>
+          <ul className="mb-4 ml-6 list-disc space-y-2 text-lg">
+            <li>
+              <strong>Starting Capital</strong>—your current invested balance
+            </li>
+            <li>
+              <strong>Monthly Savings</strong>—ongoing contributions to your
+              portfolio
+            </li>
+            <li>
+              <strong>Expected Annual Growth Rate (CAGR)</strong>—compounding
+              returns before inflation
+            </li>
+            <li>
+              <strong>Annual Inflation Rate</strong>—to inflate your target
+              withdrawal each year
+            </li>
+            <li>
+              <strong>Desired Monthly Allowance</strong>—today&apos;s-value
+              spending goal
+            </li>
+            <li>
+              <strong>Retirement Age & Life Expectancy</strong>—defines your
+              accumulation horizon and payout period
+            </li>
+          </ul>
+          <p className="text-lg leading-relaxed">Key features:</p>
+          <ul className="mb-4 ml-6 list-disc space-y-2 text-lg">
+            <li>
+              <strong>Real-time calculation</strong>—as you tweak any input,
+              your FIRE Number and chart update instantly.
+            </li>
+            <li>
+              <strong>Interactive chart</strong> with area plots for both{" "}
+              <em>portfolio balance</em> and{" "}
+              <em>inflation-adjusted allowance</em>, plus reference lines
+              showing your retirement date and required FIRE Number.
+            </li>
+            <li>
+              <strong>Custom simulation</strong>—switches from accumulation
+              (adding savings) to retirement (withdrawing allowance),
+              compounding each year based on your growth rate.
+            </li>
+          </ul>
+          <p className="text-lg leading-relaxed">
+            With this level of granularity, you can confidently experiment with
+            savings rate, target retirement age, and investment assumptions to
+            discover how small tweaks speed up or delay your path to financial
+            independence.
+          </p>
+        </section>
+
+        <section className="mb-12">
+          <h2 className="mb-4 text-3xl font-bold">
+            FIRE & Investing Frequently Asked Questions (FAQ)
           </h2>
           <Accordion type="single" collapsible className="w-full">
             <AccordionItem value="item-1">
               <AccordionTrigger className="text-xl font-semibold">
-                What is the 4% rule?
+                What methodology does this calculator use?
               </AccordionTrigger>
               <AccordionContent className="text-lg leading-relaxed">
-                The 4% rule is a guideline suggesting that you can safely
+                We run a multi-year projection in two phases:
-                withdraw 4% of your investment portfolio&apos;s value in your
+                <ol className="ml-6 list-decimal space-y-1">
-                first year of retirement, and then adjust that amount for
+                  <li>
-                inflation each subsequent year, with a high probability of your
+                    <strong>Accumulation:</strong> Your balance grows by CAGR
-                money lasting for at least 30 years. This calculator uses a more
+                    and you add monthly savings.
-                dynamic simulation based on your life expectancy but is related
+                  </li>
-                to this concept.
+                  <li>
+                    <strong>Retirement:</strong> The balance continues
+                    compounding, but you withdraw an inflation-adjusted monthly
+                    allowance.
+                  </li>
+                </ol>
+                The result: a precise estimate of the capital you&apos;ll have
+                at retirement (your “FIRE Number”) and how long it will last
+                until your chosen life expectancy.
               </AccordionContent>
             </AccordionItem>
 
             <AccordionItem value="item-2">
               <AccordionTrigger className="text-xl font-semibold">
-                Is the Expected Growth Rate realistic?
+                Why isn&apos;t this just the 4% rule?
               </AccordionTrigger>
               <AccordionContent className="text-lg leading-relaxed">
-                Historically, diversified stock market investments have returned
+                The 4% rule is a useful starting point (25× annual spending),
-                around 7-10% annually over the long term, before inflation. A
+                but it assumes a fixed withdrawal rate with inflation
-                rate of 7% (after fees) is often used as a reasonable estimate,
+                adjustments and doesn&apos;t model ongoing savings or dynamic
-                but past performance doesn&apos;t guarantee future results.
+                market returns. Our calculator simulates each year&apos;s
-                It&apos;s crucial to choose a rate you feel comfortable with and
+                growth, contributions, and inflation-indexed withdrawals to give
-                understand the associated risks.
+                you a tailored picture.
               </AccordionContent>
             </AccordionItem>
 
             <AccordionItem value="item-3">
               <AccordionTrigger className="text-xl font-semibold">
-                How does inflation impact my FIRE number?
+                How do I choose a realistic growth rate?
               </AccordionTrigger>
               <AccordionContent className="text-lg leading-relaxed">
-                Inflation erodes the purchasing power of money over time. Your
+                Historically, a diversified portfolio of equities and bonds has
-                desired monthly allowance needs to increase each year just to
+                returned around 7-10% per year before inflation. We recommend
-                maintain the same standard of living. This calculator accounts
+                starting around 6-8% (net of fees), then running “what-if”
-                for this by adjusting your target allowance upwards based on the
+                scenarios—5% on the conservative side, 10% on the aggressive
-                inflation rate you provide, ensuring the calculated FIRE number
+                side—to see how they affect your timeline.
-                supports your desired lifestyle in future dollars.
               </AccordionContent>
             </AccordionItem>
 
             <AccordionItem value="item-4">
               <AccordionTrigger className="text-xl font-semibold">
-                Can I really retire early?
+                How does inflation factor into my FIRE Number?
               </AccordionTrigger>
               <AccordionContent className="text-lg leading-relaxed">
-                Retiring significantly earlier than traditional retirement age
+                Cost of living rises. To maintain today&apos;s lifestyle, your
-                is possible but requires discipline, a high savings rate, and
+                monthly allowance must grow each year by your inflation rate.
-                consistent investment growth. The feasibility depends heavily on
+                This calculator automatically inflates your desired monthly
-                your income, expenses, savings habits, and investment returns.
+                spending and subtracts it from your portfolio during retirement,
-                Use this calculator as a tool for planning and motivation, but
+                ensuring your FIRE Number keeps pace with rising expenses.
-                remember it provides estimates based on your inputs.
               </AccordionContent>
             </AccordionItem>
 
             <AccordionItem value="item-5">
               <AccordionTrigger className="text-xl font-semibold">
-                What does FIRE stand for?
+                Can I really retire early with FIRE?
               </AccordionTrigger>
               <AccordionContent className="text-lg leading-relaxed">
-                FIRE stands for Financial Independence, Retire Early. It
+                Early retirement is achievable with disciplined saving, smart
-                represents a lifestyle movement aimed at maximizing your savings
+                investing, and realistic assumptions. This tool helps you set
-                rate through increased income and/or decreased expenses to
+                targets, visualize outcomes, and adjust inputs—so you can build
-                achieve financial independence and retire much earlier than
+                confidence in your plan and make informed trade-offs between
-                traditional retirement age.
+                lifestyle, risk, and timeline.
               </AccordionContent>
             </AccordionItem>
 
             <AccordionItem value="item-6">
               <AccordionTrigger className="text-xl font-semibold">
-                How much should I save each month?
+                How should I use this calculator effectively?
               </AccordionTrigger>
               <AccordionContent className="text-lg leading-relaxed">
-                FIRE enthusiasts typically aim to save 50-70% of their income.
+                <ul className="ml-6 list-disc space-y-1">
-                The more you can save, the faster you&apos;ll reach your FIRE
+                  <li>
-                goal. However, the right amount depends on your income,
+                    Start with your actual numbers (capital, savings, age).
-                lifestyle, and target retirement age. Use the calculator to
+                  </li>
-                experiment with different monthly savings amounts to see their
+                  <li>
-                impact on your retirement timeline.
+                    Set conservative - mid - aggressive growth rates to bound
+                    possibilities.
+                  </li>
+                  <li>
+                    Slide your retirement age to explore “early” vs.
+                    “traditional” scenarios.
+                  </li>
+                  <li>
+                    Review the chart—especially the reference lines—to see when
+                    you hit FI and how withdrawals impact your balance.
+                  </li>
+                  <li>
+                    Experiment with higher savings rates or lower target
+                    spending to accelerate your path.
+                  </li>
+                </ul>
               </AccordionContent>
             </AccordionItem>
           </Accordion>
@@ -182,28 +243,35 @@ export default function HomePage() {
         {/* Optional: Add a section for relevant resources/links here */}
         <section className="mb-12">
           <h2 className="mb-4 text-3xl font-bold">
-            Further Reading & Resources
+            FIRE Journey & Investing Resources
           </h2>
           <p className="mb-6 text-lg leading-relaxed">
-            Want to learn more about FIRE and continue your journey to financial
+            Ready to deepen your knowledge and build a bullet-proof plan? Below
-            independence? Here are some valuable resources to explore:
+            are some of our favorite blogs, books, tools, and communities for
+            financial independence and smart investing.
           </p>
 
-          <div className="bg-secondary/20 my-8 rounded-md p-4 text-lg">
+          <div className="bg-foreground my-8 rounded-md p-4 text-lg">
             <p className="font-semibold">Getting Started with FIRE:</p>
             <ol className="ml-6 list-decimal space-y-1">
               <li>
-                Read foundational content like Mr. Money Mustache&apos;s simple
+                Run your first projection above to find your target FIRE Number.
-                math article
+              </li>
+              <li>Identify areas to boost savings or reduce expenses.</li>
+              <li>
+                Study index-fund strategies and low-cost investing advice.
               </li>
               <li>
-                Calculate your personal numbers using this and other FIRE
+                Join{" "}
-                calculators
+                <a
+                  href="https://www.reddit.com/r/Fire/"
+                  target="_blank"
+                  className="text-primary hover:underline"
+                >
+                  supportive communities like r/Fire
+                </a>{" "}
+                to learn from real journeys.
               </li>
-              <li>
-                Join communities like r/Fire to ask questions and find support
-              </li>
-              <li>Explore books and podcasts to deepen your understanding</li>
             </ol>
           </div>
 
@@ -213,70 +281,70 @@ export default function HomePage() {
               <ul className="ml-6 list-disc space-y-2 text-lg">
                 <li>
                   <a
-                    href="https://www.mrmoneymustache.com/2012/01/13/the-shockingly-simple-math-behind-early-retirement/"
+                    href="https://www.mrmoneymustache.com/"
                     target="_blank"
-                    rel="noopener noreferrer"
                     className="text-primary hover:underline"
                   >
-                    Mr. Money Mustache - The Shockingly Simple Math Behind Early
+                    Mr. Money Mustache
-                    Retirement
+                  </a>{" "}
-                  </a>
+                  - Hardcore frugality & early retirement success stories.
-                </li>
-                <li>
-                  <a
-                    href="https://www.playingwithfire.co/resources"
-                    target="_blank"
-                    rel="noopener noreferrer"
-                    className="text-primary hover:underline"
-                  >
-                    Playing With FIRE - Comprehensive Resources
-                  </a>
-                </li>
-                <li>
-                  <a
-                    href="https://www.reddit.com/r/Fire/"
-                    target="_blank"
-                    rel="noopener noreferrer"
-                    className="text-primary hover:underline"
-                  >
-                    r/Fire Reddit Community
-                  </a>
-                </li>
-              </ul>
-            </div>
-
-            <div>
-              <h3 className="mb-3 text-xl font-semibold">Books & Learning</h3>
-              <ul className="ml-6 list-disc space-y-2 text-lg">
-                <li>
-                  <a
-                    href="https://www.amazon.com/Your-Money-Life-Transforming-Relationship/dp/0143115766"
-                    target="_blank"
-                    rel="noopener noreferrer"
-                    className="text-primary hover:underline"
-                  >
-                    Your Money or Your Life - Vicki Robin & Joe Dominguez
-                  </a>
                 </li>
                 <li>
                   <a
                     href="https://www.playingwithfire.co/"
                     target="_blank"
-                    rel="noopener noreferrer"
                     className="text-primary hover:underline"
                   >
-                    Playing With FIRE Documentary
+                    Playing With FIRE
-                  </a>
+                  </a>{" "}
+                  - Community resources & real-life case studies.
+                </li>
+                <li>
+                  <a
+                    href="https://www.reddit.com/r/Fire/"
+                    target="_blank"
+                    className="text-primary hover:underline"
+                  >
+                    r/Fire
+                  </a>{" "}
+                  - Active forum for questions, tips, and support.
+                </li>
+              </ul>
+            </div>
+
+            <div>
+              <h3 className="mb-3 text-xl font-semibold">Books & Podcasts</h3>
+              <ul className="ml-6 list-disc space-y-2 text-lg">
+                <li>
+                  <a
+                    href="https://www.amazon.com/Your-Money-Life-Transforming-Relationship/dp/0143115766"
+                    target="_blank"
+                    className="text-primary hover:underline"
+                  >
+                    Your Money or Your Life
+                  </a>{" "}
+                  - The classic guide to aligning money with values.
+                </li>
+                <li>
+                  <a
+                    href="https://podcasts.apple.com/us/podcast/biggerpockets-money-podcast/id1330225136"
+                    target="_blank"
+                    className="text-primary hover:underline"
+                  >
+                    BiggerPockets Money Podcast
+                  </a>{" "}
+                  - Interviews on FIRE strategies and wealth building.
                 </li>
                 <li>
                   <a
                     href="https://podcasts.apple.com/us/podcast/can-you-retire-now-this-fire-calculator-will-tell-you/id1330225136?i=1000683436292"
                     target="_blank"
-                    rel="noopener noreferrer"
                     className="text-primary hover:underline"
                   >
-                    BiggerPockets Money Podcast - FIRE Calculators
+                    InvestingFIRE Calculator Demo
-                  </a>
+                  </a>{" "}
+                  - Deep dive on how interactive projections can guide your
+                  plan.
                 </li>
               </ul>
             </div>
@@ -286,63 +354,43 @@ export default function HomePage() {
                 Additional Calculators & Tools
               </h3>
               <ul className="ml-6 list-disc space-y-2 text-lg">
+                <li>
+                  <a
+                    href="https://ghostfol.io"
+                    target="_blank"
+                    className="text-primary hover:underline"
+                  >
+                    Ghostfolio
+                  </a>{" "}
+                  - Wealth management application for individuals.
+                </li>
                 <li>
                   <a
                     href="https://walletburst.com/tools/coast-fire-calculator/"
                     target="_blank"
-                    rel="noopener noreferrer"
                     className="text-primary hover:underline"
                   >
-                    Coast FIRE Calculator - For those considering a partial
+                    Coast FIRE Calculator
-                    early retirement
+                  </a>{" "}
-                  </a>
+                  - When you “max out” early contributions but let compounding
+                  do the rest.
                 </li>
                 <li>
                   <a
-                    href="https://www.empower.com/retirement-calculator"
+                    href="https://www.investor.gov/financial-tools-calculators/calculators/compound-interest-calculator"
                     target="_blank"
-                    rel="noopener noreferrer"
                     className="text-primary hover:underline"
                   >
-                    Empower Retirement Planner - Free portfolio analysis and net
+                    Compound Interest Calculator
-                    worth tracking
+                  </a>{" "}
-                  </a>
+                  - Explore the power of growth rates in isolation.
-                </li>
-              </ul>
-            </div>
-
-            <div>
-              <h3 className="mb-3 text-xl font-semibold">
-                Recent Articles & Trends
-              </h3>
-              <ul className="ml-6 list-disc space-y-2 text-lg">
-                <li>
-                  <a
-                    href="https://www.businessinsider.com/retiring-tech-early-coast-fire-make-me-millionaire-2025-4"
-                    target="_blank"
-                    rel="noopener noreferrer"
-                    className="text-primary hover:underline"
-                  >
-                    Coast FIRE: Retiring in your 30s while becoming a
-                    millionaire by 60
-                  </a>
-                </li>
-                <li>
-                  <a
-                    href="https://www.businessinsider.com/financial-independence-retire-early-saving-loneliness-retreat-bali-making-friends-2025-2"
-                    target="_blank"
-                    rel="noopener noreferrer"
-                    className="text-primary hover:underline"
-                  >
-                    The Social Side of FIRE: Finding Community in Financial
-                    Independence
-                  </a>
                 </li>
               </ul>
             </div>
           </div>
         </section>
       </div>
+      <Footer />
     </main>
   );
 }

src/app/robots.ts

@@ -0,0 +1,11 @@
+import type { MetadataRoute } from "next";
+
+export default function robots(): MetadataRoute.Robots {
+  return {
+    rules: {
+      userAgent: "*",
+      allow: "/",
+    },
+    sitemap: "https://investingfire.com/sitemap.xml",
+  };
+}

src/app/sitemap.ts

@@ -0,0 +1,13 @@
+import { BASE_URL } from "@/lib/constants";
+import { type MetadataRoute } from "next";
+
+export default function sitemap(): MetadataRoute.Sitemap {
+  return [
+    {
+      url: BASE_URL,
+      lastModified: new Date(),
+      changeFrequency: "yearly",
+      priority: 1,
+    },
+  ];
+}

src/components/ui/accordion.tsx

@@ -44,7 +44,7 @@ function AccordionTrigger({
         {...props}
       >
         {children}
-        <ChevronDownIcon className="text-muted-foreground pointer-events-none size-4 shrink-0 translate-y-0.5 transition-transform duration-200" />
+        <ChevronDownIcon className="text-primary-foreground pointer-events-none size-4 shrink-0 translate-y-0.5 transition-transform duration-200" />
       </AccordionPrimitive.Trigger>
     </AccordionPrimitive.Header>
   );

src/components/ui/chart.tsx

@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-unsafe-assignment */
 "use client";
 
 import * as React from "react";
@@ -8,15 +9,16 @@ import { cn } from "@/lib/utils";
 // Format: { THEME_NAME: CSS_SELECTOR }
 const THEMES = { light: "", dark: ".dark" } as const;
 
-export type ChartConfig = {
+export type ChartConfig = Record<
-  [k in string]: {
+  string,
+  {
     label?: React.ReactNode;
     icon?: React.ComponentType;
   } & (
     | { color?: string; theme?: never }
     | { color?: never; theme: Record<keyof typeof THEMES, string> }
-  );
+  )
-};
+>;
 
 type ChartContextProps = {
   config: ChartConfig;
@@ -47,7 +49,7 @@ function ChartContainer({
   >["children"];
 }) {
   const uniqueId = React.useId();
-  const chartId = `chart-${id || uniqueId.replace(/:/g, "")}`;
+  const chartId = `chart-${id ?? uniqueId.replace(/:/g, "")}`;
 
   return (
     <ChartContext.Provider value={{ config }}>
@@ -71,7 +73,7 @@ function ChartContainer({
 
 const ChartStyle = ({ id, config }: { id: string; config: ChartConfig }) => {
   const colorConfig = Object.entries(config).filter(
-    ([, config]) => config.theme || config.color,
+    ([, config]) => config.theme ?? config.color,
   );
 
   if (!colorConfig.length) {
@@ -88,7 +90,7 @@ ${prefix} [data-chart=${id}] {
 ${colorConfig
   .map(([key, itemConfig]) => {
     const color =
-      itemConfig.theme?.[theme as keyof typeof itemConfig.theme] ||
+      itemConfig.theme?.[theme as keyof typeof itemConfig.theme] ??
       itemConfig.color;
     return color ? `  --color-${key}: ${color};` : null;
   })
@@ -134,11 +136,11 @@ function ChartTooltipContent({
     }
 
     const [item] = payload;
-    const key = `${labelKey || item?.dataKey || item?.name || "value"}`;
+    const key = `${labelKey ?? item?.dataKey ?? item?.name ?? "value"}`;
     const itemConfig = getPayloadConfigFromPayload(config, item, key);
     const value =
       !labelKey && typeof label === "string"
-        ? config[label as keyof typeof config]?.label || label
+        ? (config[label]?.label ?? label)
         : itemConfig?.label;
 
     if (labelFormatter) {
@@ -180,9 +182,11 @@ function ChartTooltipContent({
       {!nestLabel ? tooltipLabel : null}
       <div className="grid gap-1.5">
         {payload.map((item, index) => {
-          const key = `${nameKey || item.name || item.dataKey || "value"}`;
+          const key = `${nameKey ?? item.name ?? item.dataKey ?? "value"}`;
           const itemConfig = getPayloadConfigFromPayload(config, item, key);
-          const indicatorColor = color || item.payload.fill || item.color;
+          const indicatorColor: string | undefined =
+            // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
+            color ?? item.payload.fill ?? item.color;
 
           return (
             <div
@@ -193,6 +197,7 @@ function ChartTooltipContent({
               )}
             >
               {formatter && item?.value !== undefined && item.name ? (
+                // eslint-disable-next-line @typescript-eslint/no-unsafe-argument
                 formatter(item.value, item.name, item, index, item.payload)
               ) : (
                 <>
@@ -229,7 +234,7 @@ function ChartTooltipContent({
                     <div className="grid gap-1.5">
                       {nestLabel ? tooltipLabel : null}
                       <span className="text-muted-foreground">
-                        {itemConfig?.label || item.name}
+                        {itemConfig?.label ?? item.name}
                       </span>
                     </div>
                     {item.value && (
@@ -276,7 +281,8 @@ function ChartLegendContent({
       )}
     >
       {payload.map((item) => {
-        const key = `${nameKey || item.dataKey || "value"}`;
+        // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
+        const key = `${nameKey ?? item.dataKey ?? "value"}`;
         const itemConfig = getPayloadConfigFromPayload(config, item, key);
 
         return (
@@ -338,9 +344,7 @@ function getPayloadConfigFromPayload(
     ] as string;
   }
 
-  return configLabelKey in config
+  return configLabelKey in config ? config[configLabelKey] : config[key];
-    ? config[configLabelKey]
-    : config[key as keyof typeof config];
 }
 
 export {

src/components/ui/select.tsx

@@ -0,0 +1,185 @@
+"use client";
+
+import * as React from "react";
+import * as SelectPrimitive from "@radix-ui/react-select";
+import { CheckIcon, ChevronDownIcon, ChevronUpIcon } from "lucide-react";
+
+import { cn } from "@/lib/utils";
+
+function Select({
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Root>) {
+  return <SelectPrimitive.Root data-slot="select" {...props} />;
+}
+
+function SelectGroup({
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Group>) {
+  return <SelectPrimitive.Group data-slot="select-group" {...props} />;
+}
+
+function SelectValue({
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Value>) {
+  return <SelectPrimitive.Value data-slot="select-value" {...props} />;
+}
+
+function SelectTrigger({
+  className,
+  size = "default",
+  children,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Trigger> & {
+  size?: "sm" | "default";
+}) {
+  return (
+    <SelectPrimitive.Trigger
+      data-slot="select-trigger"
+      data-size={size}
+      className={cn(
+        "border-input data-[placeholder]:text-muted-foreground [&_svg:not([class*='text-'])]:text-muted-foreground focus-visible:border-ring focus-visible:ring-ring/50 aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 aria-invalid:border-destructive dark:bg-input/30 dark:hover:bg-input/50 flex w-fit items-center justify-between gap-2 rounded-md border bg-transparent px-3 py-2 text-sm whitespace-nowrap shadow-xs transition-[color,box-shadow] outline-none focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50 data-[size=default]:h-9 data-[size=sm]:h-8 *:data-[slot=select-value]:line-clamp-1 *:data-[slot=select-value]:flex *:data-[slot=select-value]:items-center *:data-[slot=select-value]:gap-2 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+        className,
+      )}
+      {...props}
+    >
+      {children}
+      <SelectPrimitive.Icon asChild>
+        <ChevronDownIcon className="size-4 opacity-50" />
+      </SelectPrimitive.Icon>
+    </SelectPrimitive.Trigger>
+  );
+}
+
+function SelectContent({
+  className,
+  children,
+  position = "popper",
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Content>) {
+  return (
+    <SelectPrimitive.Portal>
+      <SelectPrimitive.Content
+        data-slot="select-content"
+        className={cn(
+          "bg-popover text-popover-foreground data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 relative z-50 max-h-(--radix-select-content-available-height) min-w-[8rem] origin-(--radix-select-content-transform-origin) overflow-x-hidden overflow-y-auto rounded-md border shadow-md",
+          position === "popper" &&
+            "data-[side=bottom]:translate-y-1 data-[side=left]:-translate-x-1 data-[side=right]:translate-x-1 data-[side=top]:-translate-y-1",
+          className,
+        )}
+        position={position}
+        {...props}
+      >
+        <SelectScrollUpButton />
+        <SelectPrimitive.Viewport
+          className={cn(
+            "p-1",
+            position === "popper" &&
+              "h-[var(--radix-select-trigger-height)] w-full min-w-[var(--radix-select-trigger-width)] scroll-my-1",
+          )}
+        >
+          {children}
+        </SelectPrimitive.Viewport>
+        <SelectScrollDownButton />
+      </SelectPrimitive.Content>
+    </SelectPrimitive.Portal>
+  );
+}
+
+function SelectLabel({
+  className,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Label>) {
+  return (
+    <SelectPrimitive.Label
+      data-slot="select-label"
+      className={cn("text-muted-foreground px-2 py-1.5 text-xs", className)}
+      {...props}
+    />
+  );
+}
+
+function SelectItem({
+  className,
+  children,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Item>) {
+  return (
+    <SelectPrimitive.Item
+      data-slot="select-item"
+      className={cn(
+        "focus:bg-accent focus:text-accent-foreground [&_svg:not([class*='text-'])]:text-muted-foreground relative flex w-full cursor-default items-center gap-2 rounded-sm py-1.5 pr-8 pl-2 text-sm outline-hidden select-none data-[disabled]:pointer-events-none data-[disabled]:opacity-50 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4 *:[span]:last:flex *:[span]:last:items-center *:[span]:last:gap-2",
+        className,
+      )}
+      {...props}
+    >
+      <span className="absolute right-2 flex size-3.5 items-center justify-center">
+        <SelectPrimitive.ItemIndicator>
+          <CheckIcon className="size-4" />
+        </SelectPrimitive.ItemIndicator>
+      </span>
+      <SelectPrimitive.ItemText>{children}</SelectPrimitive.ItemText>
+    </SelectPrimitive.Item>
+  );
+}
+
+function SelectSeparator({
+  className,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.Separator>) {
+  return (
+    <SelectPrimitive.Separator
+      data-slot="select-separator"
+      className={cn("bg-border pointer-events-none -mx-1 my-1 h-px", className)}
+      {...props}
+    />
+  );
+}
+
+function SelectScrollUpButton({
+  className,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.ScrollUpButton>) {
+  return (
+    <SelectPrimitive.ScrollUpButton
+      data-slot="select-scroll-up-button"
+      className={cn(
+        "flex cursor-default items-center justify-center py-1",
+        className,
+      )}
+      {...props}
+    >
+      <ChevronUpIcon className="size-4" />
+    </SelectPrimitive.ScrollUpButton>
+  );
+}
+
+function SelectScrollDownButton({
+  className,
+  ...props
+}: React.ComponentProps<typeof SelectPrimitive.ScrollDownButton>) {
+  return (
+    <SelectPrimitive.ScrollDownButton
+      data-slot="select-scroll-down-button"
+      className={cn(
+        "flex cursor-default items-center justify-center py-1",
+        className,
+      )}
+      {...props}
+    >
+      <ChevronDownIcon className="size-4" />
+    </SelectPrimitive.ScrollDownButton>
+  );
+}
+
+export {
+  Select,
+  SelectContent,
+  SelectGroup,
+  SelectItem,
+  SelectLabel,
+  SelectScrollDownButton,
+  SelectScrollUpButton,
+  SelectSeparator,
+  SelectTrigger,
+  SelectValue,
+};

src/components/ui/slider.tsx

@@ -0,0 +1,63 @@
+"use client";
+
+import * as React from "react";
+import * as SliderPrimitive from "@radix-ui/react-slider";
+
+import { cn } from "@/lib/utils";
+
+function Slider({
+  className,
+  defaultValue,
+  value,
+  min = 0,
+  max = 100,
+  ...props
+}: React.ComponentProps<typeof SliderPrimitive.Root>) {
+  const _values = React.useMemo(
+    () =>
+      Array.isArray(value)
+        ? value
+        : Array.isArray(defaultValue)
+          ? defaultValue
+          : [min, max],
+    [value, defaultValue, min, max],
+  );
+
+  return (
+    <SliderPrimitive.Root
+      data-slot="slider"
+      defaultValue={defaultValue}
+      value={value}
+      min={min}
+      max={max}
+      className={cn(
+        "relative flex w-full touch-none items-center select-none data-[disabled]:opacity-50 data-[orientation=vertical]:h-full data-[orientation=vertical]:min-h-44 data-[orientation=vertical]:w-auto data-[orientation=vertical]:flex-col",
+        className,
+      )}
+      {...props}
+    >
+      <SliderPrimitive.Track
+        data-slot="slider-track"
+        className={cn(
+          "bg-muted relative grow overflow-hidden rounded-full data-[orientation=horizontal]:h-1.5 data-[orientation=horizontal]:w-full data-[orientation=vertical]:h-full data-[orientation=vertical]:w-1.5",
+        )}
+      >
+        <SliderPrimitive.Range
+          data-slot="slider-range"
+          className={cn(
+            "bg-primary absolute data-[orientation=horizontal]:h-full data-[orientation=vertical]:w-full",
+          )}
+        />
+      </SliderPrimitive.Track>
+      {Array.from({ length: _values.length }, (_, index) => (
+        <SliderPrimitive.Thumb
+          data-slot="slider-thumb"
+          key={index}
+          className="border-primary bg-background ring-ring/50 block size-4 shrink-0 rounded-full border shadow-sm transition-[color,box-shadow] hover:ring-4 focus-visible:ring-4 focus-visible:outline-hidden disabled:pointer-events-none disabled:opacity-50"
+        />
+      ))}
+    </SliderPrimitive.Root>
+  );
+}
+
+export { Slider };

src/env.js

@@ -0,0 +1,40 @@
+import { createEnv } from "@t3-oss/env-nextjs";
+import { z } from "zod";
+
+export const env = createEnv({
+  /**
+   * Specify your server-side environment variables schema here. This way you can ensure the app
+   * isn't built with invalid env vars.
+   */
+  server: {
+    NODE_ENV: z.enum(["development", "test", "production"]),
+  },
+
+  /**
+   * Specify your client-side environment variables schema here. This way you can ensure the app
+   * isn't built with invalid env vars. To expose them to the client, prefix them with
+   * `NEXT_PUBLIC_`.
+   */
+  client: {
+    // NEXT_PUBLIC_CLIENTVAR: z.string(),
+  },
+
+  /**
+   * You can't destruct `process.env` as a regular object in the Next.js edge runtimes (e.g.
+   * middlewares) or client-side so we need to destruct manually.
+   */
+  runtimeEnv: {
+    NODE_ENV: process.env.NODE_ENV,
+    // NEXT_PUBLIC_CLIENTVAR: process.env.NEXT_PUBLIC_CLIENTVAR,
+  },
+  /**
+   * Run `build` or `dev` with `SKIP_ENV_VALIDATION` to skip env validation. This is especially
+   * useful for Docker builds.
+   */
+  skipValidation: !!process.env.SKIP_ENV_VALIDATION,
+  /**
+   * Makes it so that empty strings are treated as undefined. `SOME_VAR: z.string()` and
+   * `SOME_VAR=''` will throw an error.
+   */
+  emptyStringAsUndefined: true,
+});

src/lib/constants.ts

@@ -0,0 +1 @@
+export const BASE_URL = "https://investingfire.com/";