add color theme with dark and light mode!

src/components/ThemeToggle.vue

@@ -0,0 +1,38 @@
+<script setup lang="ts">
+import { ref, onMounted } from 'vue'
+import { Moon, Sun } from 'lucide-vue-next'
+import { Button } from '@/components/ui/button'
+
+const isDark = ref(false)
+
+const toggleTheme = () => {
+  isDark.value = !isDark.value
+  updateTheme()
+}
+
+const updateTheme = () => {
+  if (isDark.value) {
+    document.documentElement.classList.add('dark')
+    localStorage.setItem('theme', 'dark')
+  } else {
+    document.documentElement.classList.remove('dark')
+    localStorage.setItem('theme', 'light')
+  }
+}
+
+onMounted(() => {
+  const savedTheme = localStorage.getItem('theme')
+  isDark.value = 
+    savedTheme === 'dark' || 
+    (!savedTheme && window.matchMedia('(prefers-color-scheme: dark)').matches)
+  updateTheme()
+})
+</script>
+
+<template>
+  <Button variant="ghost" size="icon" @click="toggleTheme">
+    <Sun v-if="isDark" class="h-5 w-5" />
+    <Moon v-else class="h-5 w-5" />
+    <span class="sr-only">Toggle theme</span>
+  </Button>
+</template> 

src/components/layout/Footer.vue

@@ -3,9 +3,9 @@ const currentYear = new Date().getFullYear()
 </script>
 
 <template>
-  <footer class="border-t mt-auto">
-    <div class="container mx-auto px-4 py-6">
-      <div class="flex flex-col sm:flex-row items-center justify-between gap-4">
+  <footer class="bg-card border-t border-border">
+    <div class="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8">
+      <div class="flex h-16 items-center justify-between">
         <!-- Powered by section -->
         <div class="flex items-center space-x-2 text-sm text-muted-foreground">
           <span>Powered by</span>

src/components/layout/Navbar.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { ref } from 'vue'
 import { Menu, X } from 'lucide-vue-next'
+import ThemeToggle from '@/components/ThemeToggle.vue'
 
 const isOpen = ref(false)
 
@@ -16,14 +17,14 @@ const toggleMenu = () => {
 </script>
 
 <template>
-  <nav class="bg-white shadow-sm">
+  <nav class="bg-card border-b border-border">
     <div class="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8">
       <div class="flex h-16 justify-between">
         <!-- Logo and Desktop Navigation -->
         <div class="flex">
           <div class="flex flex-shrink-0 items-center">
             <!-- Replace with your logo -->
-            <router-link to="/" class="text-xl font-bold">
+            <router-link to="/" class="text-xl font-bold text-card-foreground">
               ⚡️ Lightning Directory
             </router-link>
           </div>
@@ -37,8 +38,8 @@ const toggleMenu = () => {
               class="inline-flex items-center px-1 pt-1 text-sm font-medium"
               :class="[
                 $route.path === item.href
-                  ? 'border-b-2 border-primary text-gray-900'
-                  : 'text-gray-500 hover:border-b-2 hover:border-gray-300 hover:text-gray-700'
+                  ? 'border-b-2 border-primary text-card-foreground'
+                  : 'text-muted-foreground hover:border-b-2 hover:border-muted hover:text-card-foreground'
               ]"
             >
               {{ item.name }}
@@ -46,6 +47,11 @@ const toggleMenu = () => {
           </div>
         </div>
 
+        <!-- Theme Toggle -->
+        <div class="flex items-center">
+          <ThemeToggle />
+        </div>
+
         <!-- Mobile menu button -->
         <div class="flex items-center sm:hidden">
           <button