diff --git a/src/App.vue b/src/App.vue
index 27fef4b..c155b0f 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -1,15 +1,50 @@
 <script setup>
-import { ref } from 'vue'
+import { ref, onMounted, onUnmounted } from 'vue'
+import { useRouter } from 'vue-router'
 import Header from './components/Header.vue'
 import Footer from './components/Footer.vue'
 import Sidebar from './components/Sidebar.vue'
 
-const isSidebarOpen = ref(true)
+const isSidebarOpen = ref(window.innerWidth >= 768)
+const router = useRouter()
+
+// Close sidebar on route change for mobile
+router.afterEach(() => {
+  if (window.innerWidth < 768) {
+    isSidebarOpen.value = false
+  }
+})
+
+let lastWidth = window.innerWidth
+
+const handleResize = () => {
+  const width = window.innerWidth
+  // Only change state when crossing the breakpoint
+  if (width >= 768 && lastWidth < 768) {
+    isSidebarOpen.value = true
+  } else if (width < 768 && lastWidth >= 768) {
+    isSidebarOpen.value = false
+  }
+  lastWidth = width
+}
+
+onMounted(() => {
+  window.addEventListener('resize', handleResize)
+})
+
+onUnmounted(() => {
+  window.removeEventListener('resize', handleResize)
+})
 </script>
 
 <template>
   <Header @toggle-sidebar="isSidebarOpen = !isSidebarOpen" />
   <div class="app-body">
+    <div
+      class="sidebar-overlay"
+      :class="{ 'is-visible': isSidebarOpen }"
+      @click="isSidebarOpen = false"
+    ></div>
     <Sidebar :is-open="isSidebarOpen" />
     <main class="main-content">
       <router-view />
@@ -24,6 +59,7 @@ const isSidebarOpen = ref(true)
   flex: 1;
   width: 100%;
   position: relative;
+  overflow: hidden; /* Ensure body doesn't scroll */
 }
 
 .main-content {
@@ -31,5 +67,32 @@ const isSidebarOpen = ref(true)
   padding: 2rem;
   width: 100%;
   max-width: 100%; /* Ensure it doesn't overflow */
+  overflow-y: auto; /* Allow content to scroll independently */
+  height: 100%; /* Take full height of app-body */
+}
+
+.sidebar-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background-color: rgba(0, 0, 0, 0.5);
+  z-index: 900; /* Below sidebar (1000), above content */
+  opacity: 0;
+  pointer-events: none;
+  transition: opacity 0.3s ease;
+  backdrop-filter: blur(2px);
+}
+
+.sidebar-overlay.is-visible {
+  opacity: 1;
+  pointer-events: auto;
+}
+
+@media (min-width: 768px) {
+  .sidebar-overlay {
+    display: none;
+  }
 }
 </style>
diff --git a/src/components/Footer.vue b/src/components/Footer.vue
index 7d30a69..50d1a4a 100644
--- a/src/components/Footer.vue
+++ b/src/components/Footer.vue
@@ -4,7 +4,7 @@ const version = __APP_VERSION__;
 </script>
 
 <template>
-  <footer class="app-footer unselectable">
+  <footer class="app-footer glass-panel unselectable">
     <div class="footer-content">
       <p>&copy; {{ currentYear }} Tools App. v{{ version }}</p>
     </div>
@@ -14,13 +14,18 @@ const version = __APP_VERSION__;
 <style scoped>
 .app-footer {
   width: 100%;
-  padding: 1rem;
-  background-color: #242424;
-  border-top: 1px solid rgba(255, 255, 255, 0.1);
+  padding: 0.5rem;
+  /* Background handled by glass-panel */
+  border-left: none;
+  border-right: none;
+  border-bottom: none;
+  border-radius: 0;
   display: flex;
   align-items: center;
   justify-content: center;
   margin-top: auto; /* Push to bottom in flex container */
+  z-index: 10;
+  height: 30px;
 }
 
 .footer-content {
@@ -31,7 +36,7 @@ const version = __APP_VERSION__;
 
 p {
   font-size: 0.9rem;
-  color: rgba(255, 255, 255, 0.6);
+  color: var(--text-muted);
   margin: 0;
   font-family: monospace;
 }
diff --git a/src/components/Sidebar.vue b/src/components/Sidebar.vue
index cd80230..2d9b88c 100644
--- a/src/components/Sidebar.vue
+++ b/src/components/Sidebar.vue
@@ -17,20 +17,42 @@ defineProps({
 
 <style scoped>
 .sidebar {
-  width: 0;
+  /* Mobile First Styles */
+  position: fixed;
+  top: 0;
+  left: 0;
+  bottom: 0;
+  width: 250px;
   background-color: var(--panel-bg);
   backdrop-filter: blur(12px);
   -webkit-backdrop-filter: blur(12px);
   overflow-x: hidden;
-  transition: width 0.3s ease;
+  transition: transform 0.3s ease;
   border-right: 1px solid var(--panel-border);
-  flex-shrink: 0;
-  height: 100%;
+  z-index: 1000;
   box-shadow: var(--panel-shadow);
+  transform: translateX(-100%);
 }
 
 .sidebar.is-open {
-  width: 250px;
+  transform: translateX(0);
+}
+
+@media (min-width: 768px) {
+  .sidebar {
+    position: static;
+    transform: none;
+    width: 0;
+    height: auto;
+    transition: width 0.3s ease;
+    z-index: auto;
+    box-shadow: none; /* Shadow handled by panel logic or not needed inline */
+  }
+
+  .sidebar.is-open {
+    width: 250px;
+    transform: none;
+  }
 }
 
 .sidebar-nav {
@@ -38,11 +60,19 @@ defineProps({
   display: flex;
   flex-direction: column;
   width: 250px; /* Fixed width for content */
+  min-width: 250px;
+  padding-top: 1rem; /* Add some top padding for mobile aesthetic */
+}
+
+@media (min-width: 768px) {
+  .sidebar-nav {
+    padding-top: 0;
+  }
 }
 
 .nav-item {
   display: block;
-  padding: 0.5rem;
+  padding: 0.75rem 1rem;
   color: var(--text-secondary);
   text-decoration: none;
   transition: background-color 0.2s, color 0.2s;
diff --git a/src/style.css b/src/style.css
index 8d206b2..b91ef4e 100644
--- a/src/style.css
+++ b/src/style.css
@@ -84,7 +84,8 @@ body {
   margin: 0;
   display: flex;
   min-width: 320px;
-  min-height: 100vh;
+  height: 100vh;
+  overflow: hidden; /* Prevent body scroll */
 }
 
 #app {
@@ -92,6 +93,7 @@ body {
   height: 100vh;
   display: flex;
   flex-direction: column;
+  overflow: hidden; /* Prevent app scroll */
 }
 
 /* Common UI Element Styles */