feat: replace Tailwind with UnoCSS

Faster dev HMR, native Astro 6 support, same utility class names.
Tokens migrated to uno.config.ts.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

astro.config.mjs

@@ -1,6 +1,6 @@
 import { defineConfig } from 'astro/config';
-import tailwind from '@astrojs/tailwind';
+import UnoCSS from '@unocss/astro';
 
 export default defineConfig({
-  integrations: [tailwind()],
+  integrations: [UnoCSS({ injectReset: true })],
 });

package.json

@@ -13,7 +13,7 @@
     "astro": "^6.3.1"
   },
   "devDependencies": {
-    "@astrojs/tailwind": "^6.0.2",
-    "tailwindcss": "^3.4.19"
+    "@unocss/astro": "^66.6.8",
+    "unocss": "^66.6.8"
   }
 }

src/styles/global.css

@@ -1,3 +1 @@
-@tailwind base;
-@tailwind components;
-@tailwind utilities;
+/* UnoCSS handles reset and utilities via astro.config.mjs injectReset */

tailwind.config.mjs

@@ -1,21 +0,0 @@
-/** @type {import('tailwindcss').Config} */
-export default {
-  content: ['./src/**/*.{astro,html,js,jsx,md,mdx,ts,tsx}'],
-  theme: {
-    extend: {
-      colors: {
-        brand: '#f28a4b',
-        'text-primary': '#2e2a28',
-        'text-secondary': '#7a726d',
-        surface: '#f8f3ee',
-        'surface-alt': '#f2eae3',
-        'surface-footer': '#efe6de',
-        'border-light': '#e3d9d1',
-      },
-      fontFamily: {
-        sans: ['Inter', 'sans-serif'],
-      },
-    },
-  },
-  plugins: [],
-}

uno.config.ts

@@ -0,0 +1,19 @@
+import { defineConfig, presetWind } from 'unocss'
+
+export default defineConfig({
+  presets: [presetWind()],
+  theme: {
+    colors: {
+      brand: '#f28a4b',
+      'text-primary': '#2e2a28',
+      'text-secondary': '#7a726d',
+      surface: '#f8f3ee',
+      'surface-alt': '#f2eae3',
+      'surface-footer': '#efe6de',
+      'border-light': '#e3d9d1',
+    },
+    fontFamily: {
+      sans: ['Inter', 'sans-serif'],
+    },
+  },
+})