feat: configure Tailwind design tokens

tailwind.config.mjs

@@ -0,0 +1,21 @@
+/** @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: [],
+}