feat(frontend): configure Tailwind CSS v4 with PostCSS

- Install tailwindcss, postcss, autoprefixer, and @tailwindcss/postcss
- Create tailwind.config.js with content paths for all source files
- Create postcss.config.js with Tailwind and Autoprefixer plugins
- Update index.css with Tailwind directives (@tailwind base/components/utilities)
- Update App.tsx to demonstrate Tailwind utility classes
- Verify both build and dev server work correctly
- Update TODO.md to mark task as complete

TODO.md

@@ -17,7 +17,7 @@
 
 ### Frontend Setup
 - [x] Initialize React + Vite project
-- [ ] Configure Tailwind CSS
+- [x] Configure Tailwind CSS
 - [ ] Set up React Router
 - [ ] Create recipe list page
 - [ ] Create recipe detail/edit page
@@ -46,7 +46,16 @@
 ## ✅ Completed Tasks
 
 ### 2026-03-24
-- **Frontend initialization** (latest commit)
+- **Tailwind CSS configuration**
+  - Installed Tailwind CSS v4 with PostCSS and Autoprefixer
+  - Installed @tailwindcss/postcss plugin for v4 compatibility
+  - Created tailwind.config.js with content paths
+  - Created postcss.config.js with Tailwind and Autoprefixer
+  - Updated index.css with Tailwind directives
+  - Updated App.tsx to demonstrate Tailwind utility classes
+  - Verified build and dev server work correctly
+
+- **Frontend initialization**
   - Created frontend/ directory with Vite + React + TypeScript
   - Installed React Router 7
   - Set up project structure (components/, hooks/, pages/, services/, types/)

frontend/package-lock.json

@@ -14,19 +14,36 @@
       },
       "devDependencies": {
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+        "@tailwindcss/postcss": "^4.2.2",
         "@types/node": "^24.12.0",
         "@types/react": "^19.2.14",
         "@types/react-dom": "^19.2.3",
         "@vitejs/plugin-react": "^6.0.1",
+        "autoprefixer": "^10.4.27",
         "eslint": "^9.39.4",
         "eslint-plugin-react-hooks": "^7.0.1",
         "eslint-plugin-react-refresh": "^0.5.2",
         "globals": "^17.4.0",
+        "postcss": "^8.5.8",
+        "tailwindcss": "^4.2.2",
         "typescript": "~5.9.3",
         "typescript-eslint": "^8.57.0",
         "vite": "^8.0.1"
       }
     },
+    "node_modules/@alloc/quick-lru": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/@alloc/quick-lru/-/quick-lru-5.2.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
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     "node_modules/@babel/code-frame": {
       "version": "7.29.0",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.0.tgz",
@@ -849,6 +866,277 @@
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       "license": "MIT"
     },
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+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/node/-/node-4.2.2.tgz",
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+        "enhanced-resolve": "^5.19.0",
+        "jiti": "^2.6.1",
+        "lightningcss": "1.32.0",
+        "magic-string": "^0.30.21",
+        "source-map-js": "^1.2.1",
+        "tailwindcss": "4.2.2"
+      }
+    },
+    "node_modules/@tailwindcss/oxide": {
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+        "@tailwindcss/oxide-freebsd-x64": "4.2.2",
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+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-wasm32-wasi/-/oxide-wasm32-wasi-4.2.2.tgz",
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+        "@emnapi/core",
+        "@emnapi/runtime",
+        "@tybys/wasm-util",
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+        "tslib"
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+      "license": "MIT",
+      "optional": true,
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+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide-win32-x64-msvc/-/oxide-win32-x64-msvc-4.2.2.tgz",
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+        "x64"
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+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">= 20"
+      }
+    },
+    "node_modules/@tailwindcss/postcss": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/postcss/-/postcss-4.2.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@alloc/quick-lru": "^5.2.0",
+        "@tailwindcss/node": "4.2.2",
+        "@tailwindcss/oxide": "4.2.2",
+        "postcss": "^8.5.6",
+        "tailwindcss": "4.2.2"
+      }
+    },
     "node_modules/@tybys/wasm-util": {
       "version": "0.10.1",
       "resolved": "https://registry.npmjs.org/@tybys/wasm-util/-/wasm-util-0.10.1.tgz",
@@ -1288,6 +1576,43 @@
       "dev": true,
       "license": "Python-2.0"
     },
+    "node_modules/autoprefixer": {
+      "version": "10.4.27",
+      "resolved": "https://registry.npmjs.org/autoprefixer/-/autoprefixer-10.4.27.tgz",
+      "integrity": "sha512-NP9APE+tO+LuJGn7/9+cohklunJsXWiaWEfV3si4Gi/XHDwVNgkwr1J3RQYFIvPy76GmJ9/bW8vyoU1LcxwKHA==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/postcss/"
+        },
+        {
+          "type": "tidelift",
+          "url": "https://tidelift.com/funding/github/npm/autoprefixer"
+        },
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/ai"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "browserslist": "^4.28.1",
+        "caniuse-lite": "^1.0.30001774",
+        "fraction.js": "^5.3.4",
+        "picocolors": "^1.1.1",
+        "postcss-value-parser": "^4.2.0"
+      },
+      "bin": {
+        "autoprefixer": "bin/autoprefixer"
+      },
+      "engines": {
+        "node": "^10 || ^12 || >=14"
+      },
+      "peerDependencies": {
+        "postcss": "^8.1.0"
+      }
+    },
     "node_modules/balanced-match": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
@@ -1512,6 +1837,20 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/enhanced-resolve": {
+      "version": "5.20.1",
+      "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-5.20.1.tgz",
+      "integrity": "sha512-Qohcme7V1inbAfvjItgw0EaxVX5q2rdVEZHRBrEQdRZTssLDGsL8Lwrznl8oQ/6kuTJONLaDcGjkNP247XEhcA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "graceful-fs": "^4.2.4",
+        "tapable": "^2.3.0"
+      },
+      "engines": {
+        "node": ">=10.13.0"
+      }
+    },
     "node_modules/escalade": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
@@ -1809,6 +2148,20 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/fraction.js": {
+      "version": "5.3.4",
+      "resolved": "https://registry.npmjs.org/fraction.js/-/fraction.js-5.3.4.tgz",
+      "integrity": "sha512-1X1NTtiJphryn/uLQz3whtY6jK3fTqoE3ohKs0tT+Ujr1W59oopxmoEh7Lu5p6vBaPbgoM0bzveAW4Qi5RyWDQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "*"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/rawify"
+      }
+    },
     "node_modules/fsevents": {
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
@@ -1860,6 +2213,13 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/graceful-fs": {
+      "version": "4.2.11",
+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.2.11.tgz",
+      "integrity": "sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/has-flag": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
@@ -1954,6 +2314,16 @@
       "dev": true,
       "license": "ISC"
     },
+    "node_modules/jiti": {
+      "version": "2.6.1",
+      "resolved": "https://registry.npmjs.org/jiti/-/jiti-2.6.1.tgz",
+      "integrity": "sha512-ekilCSN1jwRvIbgeg/57YFh8qQDNbwDb9xT/qu2DAHbFFZUicIl4ygVaAvzveMhMVr3LnpSKTNnwt8PoOfmKhQ==",
+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "jiti": "lib/jiti-cli.mjs"
+      }
+    },
     "node_modules/js-tokens": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@@ -2339,6 +2709,16 @@
         "yallist": "^3.0.2"
       }
     },
+    "node_modules/magic-string": {
+      "version": "0.30.21",
+      "resolved": "https://registry.npmjs.org/magic-string/-/magic-string-0.30.21.tgz",
+      "integrity": "sha512-vd2F4YUyEXKGcLHoq+TEyCjxueSeHnFxyyjNp80yg0XV4vUhnDer/lvvlqM/arB5bXQN5K2/3oinyCRyx8T2CQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/sourcemap-codec": "^1.5.5"
+      }
+    },
     "node_modules/minimatch": {
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.5.tgz",
@@ -2524,6 +2904,13 @@
         "node": "^10 || ^12 || >=14"
       }
     },
+    "node_modules/postcss-value-parser": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/postcss-value-parser/-/postcss-value-parser-4.2.0.tgz",
+      "integrity": "sha512-1NNCs6uurfkVbeXG4S8JFT9t19m45ICnif8zWLd5oPSZ50QnwMfK+H3jv408d4jw/7Bttv5axS5IiHoLaVNHeQ==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/prelude-ls": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
@@ -2735,6 +3122,27 @@
         "node": ">=8"
       }
     },
+    "node_modules/tailwindcss": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.2.2.tgz",
+      "integrity": "sha512-KWBIxs1Xb6NoLdMVqhbhgwZf2PGBpPEiwOqgI4pFIYbNTfBXiKYyWoTsXgBQ9WFg/OlhnvHaY+AEpW7wSmFo2Q==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tapable": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.3.2.tgz",
+      "integrity": "sha512-1MOpMXuhGzGL5TTCZFItxCc0AARf1EZFQkGqMm7ERKj8+Hgr5oLvJOVFcC+lRmR8hCe2S3jC4T5D7Vg/d7/fhA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/webpack"
+      }
+    },
     "node_modules/tinyglobby": {
       "version": "0.2.15",
       "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.15.tgz",

frontend/package.json

@@ -16,14 +16,18 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.39.4",
+    "@tailwindcss/postcss": "^4.2.2",
     "@types/node": "^24.12.0",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^6.0.1",
+    "autoprefixer": "^10.4.27",
     "eslint": "^9.39.4",
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.5.2",
     "globals": "^17.4.0",
+    "postcss": "^8.5.8",
+    "tailwindcss": "^4.2.2",
     "typescript": "~5.9.3",
     "typescript-eslint": "^8.57.0",
     "vite": "^8.0.1"

frontend/postcss.config.js

@@ -0,0 +1,6 @@
+export default {
+  plugins: {
+    '@tailwindcss/postcss': {},
+    autoprefixer: {},
+  },
+}

frontend/src/App.tsx

@@ -1,19 +1,21 @@
-import './App.css'
-
 function App() {
   return (
-    <div className="App">
+    <div className="min-h-screen bg-gray-50">
-      <header>
+      <header className="bg-white shadow">
-        <h1>Recipe Manager</h1>
+        <div className="max-w-7xl mx-auto py-6 px-4">
-        <p>Frontend initialized and ready for development</p>
+          <h1 className="text-3xl font-bold text-gray-900">Recipe Manager</h1>
+          <p className="mt-2 text-gray-600">Frontend initialized and ready for development</p>
+        </div>
       </header>
-      <main>
+      <main className="max-w-7xl mx-auto py-6 px-4">
-        <p>
+        <div className="bg-white rounded-lg shadow p-6">
-          Vite + React + TypeScript project created successfully.
+          <p className="text-gray-700 mb-4">
-        </p>
+            ✅ Vite + React + TypeScript project created successfully.
-        <p>
+          </p>
-          Next steps: Configure Tailwind CSS and React Router
+          <p className="text-gray-700">
-        </p>
+            ✅ Tailwind CSS configured and working!
+          </p>
+        </div>
       </main>
     </div>
   )

frontend/src/index.css

@@ -1,3 +1,7 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
 :root {
   --text: #6b6375;
   --text-h: #08060d;
@@ -15,19 +19,10 @@
   --heading: system-ui, 'Segoe UI', Roboto, sans-serif;
   --mono: ui-monospace, Consolas, monospace;
 
-  font: 18px/145% var(--sans);
-  letter-spacing: 0.18px;
-  color-scheme: light dark;
-  color: var(--text);
-  background: var(--bg);
   font-synthesis: none;
   text-rendering: optimizeLegibility;
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
-
-  @media (max-width: 1024px) {
-    font-size: 16px;
-  }
 }
 
 @media (prefers-color-scheme: dark) {
@@ -44,68 +39,15 @@
     --shadow:
       rgba(0, 0, 0, 0.4) 0 10px 15px -3px, rgba(0, 0, 0, 0.25) 0 4px 6px -2px;
   }
-
-  #social .button-icon {
-    filter: invert(1) brightness(2);
-  }
-}
-
-#root {
-  width: 1126px;
-  max-width: 100%;
-  margin: 0 auto;
-  text-align: center;
-  border-inline: 1px solid var(--border);
-  min-height: 100svh;
-  display: flex;
-  flex-direction: column;
-  box-sizing: border-box;
 }
 
 body {
   margin: 0;
+  font-family: var(--sans);
+  color: var(--text);
+  background: var(--bg);
 }
 
-h1,
+#root {
-h2 {
+  min-height: 100vh;
-  font-family: var(--heading);
-  font-weight: 500;
-  color: var(--text-h);
-}
-
-h1 {
-  font-size: 56px;
-  letter-spacing: -1.68px;
-  margin: 32px 0;
-  @media (max-width: 1024px) {
-    font-size: 36px;
-    margin: 20px 0;
-  }
-}
-h2 {
-  font-size: 24px;
-  line-height: 118%;
-  letter-spacing: -0.24px;
-  margin: 0 0 8px;
-  @media (max-width: 1024px) {
-    font-size: 20px;
-  }
-}
-p {
-  margin: 0;
-}
-
-code,
-.counter {
-  font-family: var(--mono);
-  display: inline-flex;
-  border-radius: 4px;
-  color: var(--text-h);
-}
-
-code {
-  font-size: 15px;
-  line-height: 135%;
-  padding: 4px 8px;
-  background: var(--code-bg);
 }

frontend/tailwind.config.js

@@ -0,0 +1,11 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: [
+    "./index.html",
+    "./src/**/*.{js,ts,jsx,tsx}",
+  ],
+  theme: {
+    extend: {},
+  },
+  plugins: [],
+}