diff --git a/src/layouts/AppLayout.vue b/src/layouts/AppLayout.vue
index 24d4a64..7c8de93 100644
--- a/src/layouts/AppLayout.vue
+++ b/src/layouts/AppLayout.vue
@@ -1,12 +1,13 @@
 <script setup>
-import { ref } from 'vue'
+import { ref, onMounted, onUnmounted } from 'vue'
 import { useRouter, useRoute } from 'vue-router'
 import { useAuthStore } from '@/stores/auth'
 
 const router = useRouter()
 const route = useRoute()
 const auth = useAuthStore()
-const sidebarOpen = ref(true)
+const sidebarOpen = ref(false)
+const isMobile = ref(false)
 
 const navItems = [
   { name: 'Dashboard', path: '/', icon: 'chart-pie' },
@@ -16,6 +17,34 @@ const navItems = [
   { name: 'Aktivitäten', path: '/activities', icon: 'clipboard-list' },
 ]
 
+function checkMobile() {
+  isMobile.value = window.innerWidth < 768
+  if (!isMobile.value) {
+    sidebarOpen.value = true
+  } else {
+    sidebarOpen.value = false
+  }
+}
+
+onMounted(() => {
+  checkMobile()
+  window.addEventListener('resize', checkMobile)
+})
+
+onUnmounted(() => {
+  window.removeEventListener('resize', checkMobile)
+})
+
+function toggleSidebar() {
+  sidebarOpen.value = !sidebarOpen.value
+}
+
+function closeSidebarOnMobile() {
+  if (isMobile.value) {
+    sidebarOpen.value = false
+  }
+}
+
 function logout() {
   auth.logout()
   router.push('/login')
@@ -28,60 +57,105 @@ function isActive(path) {
 </script>
 
 <template>
-  <div class="flex h-full">
+  <div class="flex h-full relative">
+    <!-- Mobile Overlay -->
+    <div 
+      v-if="isMobile && sidebarOpen"
+      class="fixed inset-0 bg-black/50 z-40"
+      @click="closeSidebarOnMobile"
+    ></div>
+
+    <!-- Mobile Header -->
+    <header 
+      v-if="isMobile"
+      class="fixed top-0 left-0 right-0 h-14 bg-pulse-card border-b border-pulse-border flex items-center px-4 z-30"
+    >
+      <button 
+        @click="toggleSidebar"
+        class="p-2 text-white hover:bg-pulse-border rounded-lg transition-colors"
+      >
+        <svg class="w-6 h-6" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 6h16M4 12h16M4 18h16" />
+        </svg>
+      </button>
+      <div class="flex items-center gap-2 ml-3">
+        <div class="w-8 h-8 rounded-lg bg-gradient-to-br from-primary-500 to-primary-700 flex items-center justify-center">
+          <svg class="w-5 h-5 text-white" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 10V3L4 14h7v7l9-11h-7z" />
+          </svg>
+        </div>
+        <span class="text-lg font-bold text-white">Pulse</span>
+      </div>
+    </header>
+
     <!-- Sidebar -->
     <aside 
       :class="[
         'flex flex-col bg-pulse-card border-r border-pulse-border transition-all duration-300',
-        sidebarOpen ? 'w-64' : 'w-20'
+        isMobile ? 'fixed top-0 left-0 h-full z-50' : '',
+        isMobile && !sidebarOpen ? '-translate-x-full' : 'translate-x-0',
+        'w-64'
       ]"
     >
       <!-- Logo -->
-      <div class="flex items-center gap-3 px-6 py-5 border-b border-pulse-border">
-        <div class="w-10 h-10 rounded-xl bg-gradient-to-br from-primary-500 to-primary-700 flex items-center justify-center">
-          <svg class="w-6 h-6 text-white" fill="none" viewBox="0 0 24 24" stroke="currentColor">
-            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 10V3L4 14h7v7l9-11h-7z" />
-          </svg>
+      <div class="flex items-center justify-between gap-3 px-6 py-5 border-b border-pulse-border">
+        <div class="flex items-center gap-3">
+          <div class="w-10 h-10 rounded-xl bg-gradient-to-br from-primary-500 to-primary-700 flex items-center justify-center">
+            <svg class="w-6 h-6 text-white" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+              <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 10V3L4 14h7v7l9-11h-7z" />
+            </svg>
+          </div>
+          <span class="text-xl font-bold text-white">Pulse</span>
         </div>
-        <span v-if="sidebarOpen" class="text-xl font-bold text-white">Pulse</span>
+        <!-- Close button on mobile -->
+        <button 
+          v-if="isMobile"
+          @click="closeSidebarOnMobile"
+          class="p-2 text-pulse-muted hover:text-white transition-colors"
+        >
+          <svg class="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
+          </svg>
+        </button>
       </div>
 
       <!-- Navigation -->
-      <nav class="flex-1 py-4 px-3 space-y-1">
+      <nav class="flex-1 py-4 px-3 space-y-1 overflow-y-auto">
         <RouterLink 
           v-for="item in navItems" 
           :key="item.path"
           :to="item.path"
           :class="['sidebar-link', isActive(item.path) && 'active']"
+          @click="closeSidebarOnMobile"
         >
           <!-- Icons -->
-          <svg v-if="item.icon === 'chart-pie'" class="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+          <svg v-if="item.icon === 'chart-pie'" class="w-5 h-5 flex-shrink-0" fill="none" viewBox="0 0 24 24" stroke="currentColor">
             <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M11 3.055A9.001 9.001 0 1020.945 13H11V3.055z" />
             <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M20.488 9H15V3.512A9.025 9.025 0 0120.488 9z" />
           </svg>
-          <svg v-if="item.icon === 'users'" class="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+          <svg v-if="item.icon === 'users'" class="w-5 h-5 flex-shrink-0" fill="none" viewBox="0 0 24 24" stroke="currentColor">
             <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4.354a4 4 0 110 5.292M15 21H3v-1a6 6 0 0112 0v1zm0 0h6v-1a6 6 0 00-9-5.197M13 7a4 4 0 11-8 0 4 4 0 018 0z" />
           </svg>
-          <svg v-if="item.icon === 'building-office'" class="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+          <svg v-if="item.icon === 'building-office'" class="w-5 h-5 flex-shrink-0" fill="none" viewBox="0 0 24 24" stroke="currentColor">
             <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 21V5a2 2 0 00-2-2H7a2 2 0 00-2 2v16m14 0h2m-2 0h-5m-9 0H3m2 0h5M9 7h1m-1 4h1m4-4h1m-1 4h1m-5 10v-5a1 1 0 011-1h2a1 1 0 011 1v5m-4 0h4" />
           </svg>
-          <svg v-if="item.icon === 'funnel'" class="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+          <svg v-if="item.icon === 'funnel'" class="w-5 h-5 flex-shrink-0" fill="none" viewBox="0 0 24 24" stroke="currentColor">
             <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 4a1 1 0 011-1h16a1 1 0 011 1v2.586a1 1 0 01-.293.707l-6.414 6.414a1 1 0 00-.293.707V17l-4 4v-6.586a1 1 0 00-.293-.707L3.293 7.293A1 1 0 013 6.586V4z" />
           </svg>
-          <svg v-if="item.icon === 'clipboard-list'" class="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+          <svg v-if="item.icon === 'clipboard-list'" class="w-5 h-5 flex-shrink-0" fill="none" viewBox="0 0 24 24" stroke="currentColor">
             <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-3 7h3m-3 4h3m-6-4h.01M9 16h.01" />
           </svg>
-          <span v-if="sidebarOpen">{{ item.name }}</span>
+          <span>{{ item.name }}</span>
         </RouterLink>
       </nav>
 
       <!-- User -->
       <div class="border-t border-pulse-border p-4">
         <div class="flex items-center gap-3">
-          <div class="w-9 h-9 rounded-full bg-primary-600 flex items-center justify-center text-white font-medium">
+          <div class="w-9 h-9 rounded-full bg-primary-600 flex items-center justify-center text-white font-medium flex-shrink-0">
             {{ auth.user?.firstName?.[0] || 'U' }}
           </div>
-          <div v-if="sidebarOpen" class="flex-1 min-w-0">
+          <div class="flex-1 min-w-0">
             <p class="text-sm font-medium text-white truncate">
               {{ auth.user?.firstName }} {{ auth.user?.lastName }}
             </p>
@@ -89,7 +163,7 @@ function isActive(path) {
           </div>
           <button 
             @click="logout"
-            class="p-2 text-pulse-muted hover:text-white transition-colors"
+            class="p-2 text-pulse-muted hover:text-white transition-colors flex-shrink-0"
             title="Abmelden"
           >
             <svg class="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
@@ -101,7 +175,7 @@ function isActive(path) {
     </aside>
 
     <!-- Main Content -->
-    <main class="flex-1 overflow-auto">
+    <main :class="['flex-1 overflow-auto', isMobile ? 'pt-14' : '']">
       <RouterView />
     </main>
   </div>
diff --git a/src/views/ActivitiesView.vue b/src/views/ActivitiesView.vue
index bd52c3a..9824f5a 100644
--- a/src/views/ActivitiesView.vue
+++ b/src/views/ActivitiesView.vue
@@ -62,14 +62,14 @@ const typeLabels = {
 </script>
 
 <template>
-  <div class="p-6">
+  <div class="p-4 sm:p-6">
     <!-- Header -->
-    <div class="flex items-center justify-between mb-6">
+    <div class="flex flex-col sm:flex-row sm:items-center justify-between gap-4 mb-6">
       <div>
-        <h1 class="text-2xl font-bold text-white">Aktivitäten</h1>
-        <p class="text-pulse-muted">Ihre Aufgaben und Aktivitäten</p>
+        <h1 class="text-xl sm:text-2xl font-bold text-white">Aktivitäten</h1>
+        <p class="text-pulse-muted text-sm">Ihre Aufgaben und Aktivitäten</p>
       </div>
-      <button @click="showNewModal = true" class="btn-primary">
+      <button @click="showNewModal = true" class="btn-primary w-full sm:w-auto">
         <svg class="w-5 h-5 mr-2" fill="none" viewBox="0 0 24 24" stroke="currentColor">
           <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4" />
         </svg>
@@ -78,42 +78,42 @@ const typeLabels = {
     </div>
 
     <!-- Stats -->
-    <div class="grid grid-cols-2 md:grid-cols-4 gap-4 mb-6">
-      <div class="card p-4">
-        <p class="text-2xl font-bold text-white">{{ activities.stats?.totalToday || 0 }}</p>
-        <p class="text-sm text-pulse-muted">Heute fällig</p>
+    <div class="grid grid-cols-2 lg:grid-cols-4 gap-3 sm:gap-4 mb-6">
+      <div class="card p-3 sm:p-4">
+        <p class="text-xl sm:text-2xl font-bold text-white">{{ activities.stats?.totalToday || 0 }}</p>
+        <p class="text-xs sm:text-sm text-pulse-muted">Heute fällig</p>
       </div>
-      <div class="card p-4">
-        <p class="text-2xl font-bold text-green-400">{{ activities.stats?.completedToday || 0 }}</p>
-        <p class="text-sm text-pulse-muted">Heute erledigt</p>
+      <div class="card p-3 sm:p-4">
+        <p class="text-xl sm:text-2xl font-bold text-green-400">{{ activities.stats?.completedToday || 0 }}</p>
+        <p class="text-xs sm:text-sm text-pulse-muted">Heute erledigt</p>
       </div>
-      <div class="card p-4">
-        <p class="text-2xl font-bold text-red-400">{{ activities.stats?.overdue || 0 }}</p>
-        <p class="text-sm text-pulse-muted">Überfällig</p>
+      <div class="card p-3 sm:p-4">
+        <p class="text-xl sm:text-2xl font-bold text-red-400">{{ activities.stats?.overdue || 0 }}</p>
+        <p class="text-xs sm:text-sm text-pulse-muted">Überfällig</p>
       </div>
-      <div class="card p-4">
-        <p class="text-2xl font-bold text-blue-400">{{ activities.stats?.upcoming || 0 }}</p>
-        <p class="text-sm text-pulse-muted">Diese Woche</p>
+      <div class="card p-3 sm:p-4">
+        <p class="text-xl sm:text-2xl font-bold text-blue-400">{{ activities.stats?.upcoming || 0 }}</p>
+        <p class="text-xs sm:text-sm text-pulse-muted">Diese Woche</p>
       </div>
     </div>
 
     <!-- Filter Tabs -->
-    <div class="flex gap-2 mb-6">
+    <div class="flex gap-2 mb-6 overflow-x-auto pb-2 -mx-4 px-4 sm:mx-0 sm:px-0">
       <button 
         @click="filter = 'all'; activities.fetchActivities()"
-        :class="['btn-sm', filter === 'all' ? 'btn-primary' : 'btn-ghost']"
+        :class="['btn-sm whitespace-nowrap', filter === 'all' ? 'btn-primary' : 'btn-ghost']"
       >
         Alle
       </button>
       <button 
         @click="filter = 'upcoming'; activities.fetchActivities({ isCompleted: 'false' })"
-        :class="['btn-sm', filter === 'upcoming' ? 'btn-primary' : 'btn-ghost']"
+        :class="['btn-sm whitespace-nowrap', filter === 'upcoming' ? 'btn-primary' : 'btn-ghost']"
       >
         Offen
       </button>
       <button 
         @click="filter = 'completed'; activities.fetchActivities({ isCompleted: 'true' })"
-        :class="['btn-sm', filter === 'completed' ? 'btn-primary' : 'btn-ghost']"
+        :class="['btn-sm whitespace-nowrap', filter === 'completed' ? 'btn-primary' : 'btn-ghost']"
       >
         Erledigt
       </button>
@@ -124,13 +124,13 @@ const typeLabels = {
       <div 
         v-for="activity in activities.activities" 
         :key="activity.id"
-        class="p-4 flex items-center gap-4 hover:bg-pulse-dark/30 transition-colors"
+        class="p-3 sm:p-4 flex items-start sm:items-center gap-3 sm:gap-4 hover:bg-pulse-dark/30 transition-colors"
       >
         <!-- Checkbox -->
         <button 
           @click.stop="completeActivity(activity.id)"
           :class="[
-            'w-6 h-6 rounded-full border-2 flex items-center justify-center transition-colors',
+            'w-6 h-6 rounded-full border-2 flex items-center justify-center transition-colors flex-shrink-0 mt-0.5 sm:mt-0',
             activity.isCompleted 
               ? 'bg-green-500 border-green-500 text-white' 
               : 'border-pulse-border hover:border-primary-500'
@@ -141,26 +141,41 @@ const typeLabels = {
           </svg>
         </button>
 
-        <!-- Type Icon -->
-        <span class="text-xl">{{ typeIcons[activity.type] }}</span>
+        <!-- Type Icon (hidden on very small screens) -->
+        <span class="text-xl hidden sm:block">{{ typeIcons[activity.type] }}</span>
 
         <!-- Content -->
         <div class="flex-1 min-w-0">
-          <p :class="['font-medium', activity.isCompleted ? 'text-pulse-muted line-through' : 'text-white']">
-            {{ activity.subject }}
-          </p>
-          <div class="flex items-center gap-2 text-sm text-pulse-muted">
+          <div class="flex items-start sm:items-center gap-2">
+            <span class="text-base sm:hidden">{{ typeIcons[activity.type] }}</span>
+            <p :class="['font-medium text-sm sm:text-base', activity.isCompleted ? 'text-pulse-muted line-through' : 'text-white']">
+              {{ activity.subject }}
+            </p>
+          </div>
+          <div class="flex flex-wrap items-center gap-1 sm:gap-2 text-xs sm:text-sm text-pulse-muted mt-1">
             <span>{{ typeLabels[activity.type] }}</span>
             <span v-if="activity.contact">· {{ activity.contact.name }}</span>
             <span v-if="activity.company">· {{ activity.company.name }}</span>
           </div>
+          <!-- Due date on mobile -->
+          <span 
+            v-if="activity.dueDate"
+            :class="[
+              'text-xs mt-1 inline-block sm:hidden',
+              new Date(activity.dueDate) < new Date() && !activity.isCompleted
+                ? 'text-red-400'
+                : 'text-pulse-muted'
+            ]"
+          >
+            📅 {{ formatDate(activity.dueDate) }}
+          </span>
         </div>
 
-        <!-- Due Date -->
+        <!-- Due Date (desktop) -->
         <span 
           v-if="activity.dueDate"
           :class="[
-            'text-sm',
+            'text-sm hidden sm:block flex-shrink-0',
             new Date(activity.dueDate) < new Date() && !activity.isCompleted
               ? 'text-red-400'
               : 'text-pulse-muted'
@@ -171,20 +186,27 @@ const typeLabels = {
       </div>
 
       <!-- Empty State -->
-      <div v-if="!activities.loading && !activities.activities.length" class="p-12 text-center">
+      <div v-if="!activities.loading && !activities.activities.length" class="p-8 sm:p-12 text-center">
         <p class="text-pulse-muted">Keine Aktivitäten gefunden</p>
       </div>
     </div>
 
     <!-- New Activity Modal -->
     <Teleport to="body">
-      <div v-if="showNewModal" class="fixed inset-0 z-50 flex items-center justify-center">
+      <div v-if="showNewModal" class="fixed inset-0 z-50 flex items-end sm:items-center justify-center p-0 sm:p-4">
         <div class="absolute inset-0 bg-black/60" @click="showNewModal = false"></div>
-        <div class="relative card w-full max-w-md mx-4">
-          <div class="px-6 py-4 border-b border-pulse-border">
-            <h2 class="text-lg font-semibold text-white">Neue Aktivität</h2>
+        <div class="relative card w-full sm:max-w-md rounded-b-none sm:rounded-b-xl max-h-[90vh] overflow-y-auto">
+          <div class="px-4 sm:px-6 py-4 border-b border-pulse-border sticky top-0 bg-pulse-card z-10">
+            <div class="flex items-center justify-between">
+              <h2 class="text-lg font-semibold text-white">Neue Aktivität</h2>
+              <button @click="showNewModal = false" class="p-2 text-pulse-muted hover:text-white sm:hidden">
+                <svg class="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
+                </svg>
+              </button>
+            </div>
           </div>
-          <form @submit.prevent="createActivity" class="p-6 space-y-4">
+          <form @submit.prevent="createActivity" class="p-4 sm:p-6 space-y-4">
             <div>
               <label class="label">Typ</label>
               <select v-model="newActivity.type" class="input">
@@ -203,7 +225,7 @@ const typeLabels = {
               <label class="label">Fällig am</label>
               <input v-model="newActivity.dueDate" type="datetime-local" class="input" />
             </div>
-            <div class="flex gap-3 pt-2">
+            <div class="flex flex-col-reverse sm:flex-row gap-3 pt-2">
               <button type="button" @click="showNewModal = false" class="btn-secondary flex-1">
                 Abbrechen
               </button>
diff --git a/src/views/CompaniesView.vue b/src/views/CompaniesView.vue
index 00a7e9c..5b434b0 100644
--- a/src/views/CompaniesView.vue
+++ b/src/views/CompaniesView.vue
@@ -54,14 +54,14 @@ async function createCompany() {
 </script>
 
 <template>
-  <div class="p-6">
+  <div class="p-4 sm:p-6">
     <!-- Header -->
-    <div class="flex items-center justify-between mb-6">
+    <div class="flex flex-col sm:flex-row sm:items-center justify-between gap-4 mb-6">
       <div>
-        <h1 class="text-2xl font-bold text-white">Firmen</h1>
-        <p class="text-pulse-muted">{{ meta.total }} Firmen</p>
+        <h1 class="text-xl sm:text-2xl font-bold text-white">Firmen</h1>
+        <p class="text-pulse-muted text-sm">{{ meta.total }} Firmen</p>
       </div>
-      <button @click="showNewModal = true" class="btn-primary">
+      <button @click="showNewModal = true" class="btn-primary w-full sm:w-auto">
         <svg class="w-5 h-5 mr-2" fill="none" viewBox="0 0 24 24" stroke="currentColor">
           <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4" />
         </svg>
@@ -71,48 +71,51 @@ async function createCompany() {
 
     <!-- Search -->
     <div class="mb-6">
-      <div class="relative max-w-md">
+      <div class="relative w-full sm:max-w-md">
         <svg class="absolute left-3 top-1/2 -translate-y-1/2 w-5 h-5 text-pulse-muted" fill="none" viewBox="0 0 24 24" stroke="currentColor">
           <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
         </svg>
         <input 
           v-model="search"
           type="text"
-          class="input pl-10"
+          class="input pl-10 w-full"
           placeholder="Suchen..."
         />
       </div>
     </div>
 
     <!-- Grid -->
-    <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
+    <div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-3 sm:gap-4">
       <div 
         v-for="company in companies" 
         :key="company.id"
-        class="card p-5 cursor-pointer hover:border-primary-500 transition-colors"
+        class="card p-4 sm:p-5 cursor-pointer hover:border-primary-500 active:scale-[0.98] transition-all"
         @click="router.push(`/companies/${company.id}`)"
       >
-        <div class="flex items-start gap-4">
-          <div class="w-12 h-12 rounded-xl bg-purple-600/20 flex items-center justify-center text-purple-400 font-bold text-lg">
+        <div class="flex items-start gap-3 sm:gap-4">
+          <div class="w-10 h-10 sm:w-12 sm:h-12 rounded-xl bg-purple-600/20 flex items-center justify-center text-purple-400 font-bold text-base sm:text-lg flex-shrink-0">
             {{ company.name?.[0]?.toUpperCase() }}
           </div>
           <div class="flex-1 min-w-0">
             <h3 class="font-semibold text-white truncate">{{ company.name }}</h3>
-            <p v-if="company.industry" class="text-sm text-pulse-muted">{{ company.industry }}</p>
-            <div class="flex items-center gap-2 mt-2">
-              <span v-if="company.size" class="badge-gray">{{ company.size }}</span>
+            <p v-if="company.industry" class="text-sm text-pulse-muted truncate">{{ company.industry }}</p>
+            <div class="flex flex-wrap items-center gap-2 mt-2">
+              <span v-if="company.size" class="badge-gray text-xs">{{ company.size }}</span>
               <span v-if="company.contactCount" class="text-xs text-pulse-muted">
                 {{ company.contactCount }} Kontakte
               </span>
             </div>
           </div>
+          <svg class="w-5 h-5 text-pulse-muted flex-shrink-0 hidden sm:block" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" />
+          </svg>
         </div>
       </div>
     </div>
 
     <!-- Empty State -->
-    <div v-if="!loading && !companies.length" class="card p-12 text-center">
-      <svg class="w-16 h-16 mx-auto mb-4 text-pulse-muted opacity-50" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+    <div v-if="!loading && !companies.length" class="card p-8 sm:p-12 text-center">
+      <svg class="w-12 sm:w-16 h-12 sm:h-16 mx-auto mb-4 text-pulse-muted opacity-50" fill="none" viewBox="0 0 24 24" stroke="currentColor">
         <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 21V5a2 2 0 00-2-2H7a2 2 0 00-2 2v16m14 0h2m-2 0h-5m-9 0H3m2 0h5M9 7h1m-1 4h1m4-4h1m-1 4h1m-5 10v-5a1 1 0 011-1h2a1 1 0 011 1v5m-4 0h4" />
       </svg>
       <p class="text-pulse-muted">Noch keine Firmen vorhanden</p>
@@ -123,13 +126,20 @@ async function createCompany() {
 
     <!-- New Company Modal -->
     <Teleport to="body">
-      <div v-if="showNewModal" class="fixed inset-0 z-50 flex items-center justify-center">
+      <div v-if="showNewModal" class="fixed inset-0 z-50 flex items-end sm:items-center justify-center p-0 sm:p-4">
         <div class="absolute inset-0 bg-black/60" @click="showNewModal = false"></div>
-        <div class="relative card w-full max-w-lg mx-4">
-          <div class="px-6 py-4 border-b border-pulse-border">
-            <h2 class="text-lg font-semibold text-white">Neue Firma</h2>
+        <div class="relative card w-full sm:max-w-lg rounded-b-none sm:rounded-b-xl max-h-[90vh] overflow-y-auto">
+          <div class="px-4 sm:px-6 py-4 border-b border-pulse-border sticky top-0 bg-pulse-card z-10">
+            <div class="flex items-center justify-between">
+              <h2 class="text-lg font-semibold text-white">Neue Firma</h2>
+              <button @click="showNewModal = false" class="p-2 text-pulse-muted hover:text-white sm:hidden">
+                <svg class="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
+                </svg>
+              </button>
+            </div>
           </div>
-          <form @submit.prevent="createCompany" class="p-6 space-y-4">
+          <form @submit.prevent="createCompany" class="p-4 sm:p-6 space-y-4">
             <div>
               <label class="label">Firmenname *</label>
               <input v-model="newCompany.name" type="text" class="input" required />
@@ -153,7 +163,7 @@ async function createCompany() {
                 <option value="1000+">1000+ Mitarbeiter</option>
               </select>
             </div>
-            <div class="flex gap-3 pt-2">
+            <div class="flex flex-col-reverse sm:flex-row gap-3 pt-2">
               <button type="button" @click="showNewModal = false" class="btn-secondary flex-1">
                 Abbrechen
               </button>
diff --git a/src/views/ContactsView.vue b/src/views/ContactsView.vue
index dea4902..8b14be7 100644
--- a/src/views/ContactsView.vue
+++ b/src/views/ContactsView.vue
@@ -46,14 +46,14 @@ function getInitials(contact) {
 </script>
 
 <template>
-  <div class="p-6">
+  <div class="p-4 sm:p-6">
     <!-- Header -->
-    <div class="flex items-center justify-between mb-6">
+    <div class="flex flex-col sm:flex-row sm:items-center justify-between gap-4 mb-6">
       <div>
-        <h1 class="text-2xl font-bold text-white">Kontakte</h1>
-        <p class="text-pulse-muted">{{ contacts.meta.total }} Kontakte</p>
+        <h1 class="text-xl sm:text-2xl font-bold text-white">Kontakte</h1>
+        <p class="text-pulse-muted text-sm">{{ contacts.meta.total }} Kontakte</p>
       </div>
-      <button @click="showNewModal = true" class="btn-primary">
+      <button @click="showNewModal = true" class="btn-primary w-full sm:w-auto">
         <svg class="w-5 h-5 mr-2" fill="none" viewBox="0 0 24 24" stroke="currentColor">
           <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4" />
         </svg>
@@ -63,21 +63,21 @@ function getInitials(contact) {
 
     <!-- Search -->
     <div class="mb-6">
-      <div class="relative max-w-md">
+      <div class="relative w-full sm:max-w-md">
         <svg class="absolute left-3 top-1/2 -translate-y-1/2 w-5 h-5 text-pulse-muted" fill="none" viewBox="0 0 24 24" stroke="currentColor">
           <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
         </svg>
         <input 
           v-model="search"
           type="text"
-          class="input pl-10"
+          class="input pl-10 w-full"
           placeholder="Suchen..."
         />
       </div>
     </div>
 
-    <!-- Table -->
-    <div class="card">
+    <!-- Desktop Table -->
+    <div class="card hidden md:block">
       <div class="table-container">
         <table class="table">
           <thead>
@@ -98,7 +98,7 @@ function getInitials(contact) {
             >
               <td>
                 <div class="flex items-center gap-3">
-                  <div class="w-9 h-9 rounded-full bg-primary-600 flex items-center justify-center text-white text-sm font-medium">
+                  <div class="w-9 h-9 rounded-full bg-primary-600 flex items-center justify-center text-white text-sm font-medium flex-shrink-0">
                     {{ getInitials(contact) }}
                   </div>
                   <div>
@@ -117,29 +117,84 @@ function getInitials(contact) {
           </tbody>
         </table>
       </div>
+    </div>
 
-      <!-- Empty State -->
-      <div v-if="!contacts.loading && !contacts.contacts.length" class="p-12 text-center">
-        <svg class="w-16 h-16 mx-auto mb-4 text-pulse-muted opacity-50" fill="none" viewBox="0 0 24 24" stroke="currentColor">
-          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4.354a4 4 0 110 5.292M15 21H3v-1a6 6 0 0112 0v1zm0 0h6v-1a6 6 0 00-9-5.197M13 7a4 4 0 11-8 0 4 4 0 018 0z" />
-        </svg>
-        <p class="text-pulse-muted">Noch keine Kontakte vorhanden</p>
-        <button @click="showNewModal = true" class="btn-primary mt-4">
-          Ersten Kontakt anlegen
-        </button>
+    <!-- Mobile Card List -->
+    <div class="md:hidden space-y-3">
+      <div 
+        v-for="contact in contacts.contacts" 
+        :key="contact.id"
+        class="card p-4 cursor-pointer active:scale-[0.98] transition-transform"
+        @click="router.push(`/contacts/${contact.id}`)"
+      >
+        <div class="flex items-start gap-3">
+          <div class="w-10 h-10 rounded-full bg-primary-600 flex items-center justify-center text-white text-sm font-medium flex-shrink-0">
+            {{ getInitials(contact) }}
+          </div>
+          <div class="flex-1 min-w-0">
+            <p class="font-medium text-white">{{ contact.firstName }} {{ contact.lastName }}</p>
+            <p v-if="contact.position" class="text-sm text-pulse-muted">{{ contact.position }}</p>
+            <p v-if="contact.company" class="text-sm text-primary-400">{{ contact.company.name }}</p>
+            <div class="mt-2 flex flex-wrap gap-2">
+              <a 
+                v-if="contact.email" 
+                :href="`mailto:${contact.email}`"
+                @click.stop
+                class="inline-flex items-center gap-1 text-xs text-pulse-muted hover:text-white px-2 py-1 bg-pulse-dark rounded"
+              >
+                <svg class="w-3 h-3" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 8l7.89 5.26a2 2 0 002.22 0L21 8M5 19h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z" />
+                </svg>
+                {{ contact.email }}
+              </a>
+              <a 
+                v-if="contact.phone" 
+                :href="`tel:${contact.phone}`"
+                @click.stop
+                class="inline-flex items-center gap-1 text-xs text-pulse-muted hover:text-white px-2 py-1 bg-pulse-dark rounded"
+              >
+                <svg class="w-3 h-3" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 5a2 2 0 012-2h3.28a1 1 0 01.948.684l1.498 4.493a1 1 0 01-.502 1.21l-2.257 1.13a11.042 11.042 0 005.516 5.516l1.13-2.257a1 1 0 011.21-.502l4.493 1.498a1 1 0 01.684.949V19a2 2 0 01-2 2h-1C9.716 21 3 14.284 3 6V5z" />
+                </svg>
+                {{ contact.phone }}
+              </a>
+            </div>
+          </div>
+          <svg class="w-5 h-5 text-pulse-muted flex-shrink-0" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7" />
+          </svg>
+        </div>
       </div>
     </div>
 
+    <!-- Empty State -->
+    <div v-if="!contacts.loading && !contacts.contacts.length" class="card p-8 sm:p-12 text-center">
+      <svg class="w-12 sm:w-16 h-12 sm:h-16 mx-auto mb-4 text-pulse-muted opacity-50" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4.354a4 4 0 110 5.292M15 21H3v-1a6 6 0 0112 0v1zm0 0h6v-1a6 6 0 00-9-5.197M13 7a4 4 0 11-8 0 4 4 0 018 0z" />
+      </svg>
+      <p class="text-pulse-muted">Noch keine Kontakte vorhanden</p>
+      <button @click="showNewModal = true" class="btn-primary mt-4">
+        Ersten Kontakt anlegen
+      </button>
+    </div>
+
     <!-- New Contact Modal -->
     <Teleport to="body">
-      <div v-if="showNewModal" class="fixed inset-0 z-50 flex items-center justify-center">
+      <div v-if="showNewModal" class="fixed inset-0 z-50 flex items-end sm:items-center justify-center p-0 sm:p-4">
         <div class="absolute inset-0 bg-black/60" @click="showNewModal = false"></div>
-        <div class="relative card w-full max-w-lg mx-4">
-          <div class="px-6 py-4 border-b border-pulse-border">
-            <h2 class="text-lg font-semibold text-white">Neuer Kontakt</h2>
+        <div class="relative card w-full sm:max-w-lg rounded-b-none sm:rounded-b-xl max-h-[90vh] overflow-y-auto">
+          <div class="px-4 sm:px-6 py-4 border-b border-pulse-border sticky top-0 bg-pulse-card z-10">
+            <div class="flex items-center justify-between">
+              <h2 class="text-lg font-semibold text-white">Neuer Kontakt</h2>
+              <button @click="showNewModal = false" class="p-2 text-pulse-muted hover:text-white sm:hidden">
+                <svg class="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
+                </svg>
+              </button>
+            </div>
           </div>
-          <form @submit.prevent="createContact" class="p-6 space-y-4">
-            <div class="grid grid-cols-2 gap-4">
+          <form @submit.prevent="createContact" class="p-4 sm:p-6 space-y-4">
+            <div class="grid grid-cols-1 sm:grid-cols-2 gap-4">
               <div>
                 <label class="label">Vorname *</label>
                 <input v-model="newContact.firstName" type="text" class="input" required />
@@ -161,7 +216,7 @@ function getInitials(contact) {
               <label class="label">Position</label>
               <input v-model="newContact.position" type="text" class="input" placeholder="z.B. Geschäftsführer" />
             </div>
-            <div class="flex gap-3 pt-2">
+            <div class="flex flex-col-reverse sm:flex-row gap-3 pt-2">
               <button type="button" @click="showNewModal = false" class="btn-secondary flex-1">
                 Abbrechen
               </button>
diff --git a/src/views/PipelineView.vue b/src/views/PipelineView.vue
index 3f5b0ee..c4f6c7b 100644
--- a/src/views/PipelineView.vue
+++ b/src/views/PipelineView.vue
@@ -5,6 +5,7 @@ import { useDealsStore } from '@/stores/deals'
 const deals = useDealsStore()
 const showNewDealModal = ref(false)
 const draggedDeal = ref(null)
+const mobileSelectedStage = ref(null)
 
 const newDeal = ref({
   title: '',
@@ -18,6 +19,10 @@ onMounted(async () => {
   await deals.fetchPipelines()
   if (deals.currentPipeline) {
     await deals.fetchKanban(deals.currentPipeline.id)
+    // Set first stage as default for mobile
+    if (deals.kanbanData.stages?.length) {
+      mobileSelectedStage.value = deals.kanbanData.stages[0].id
+    }
   }
 })
 
@@ -73,17 +78,21 @@ function calculateStageValue(stageId) {
   const stageDeals = deals.kanbanData.deals[stageId] || []
   return stageDeals.reduce((sum, d) => sum + (d.value || 0), 0)
 }
+
+function getStageDealsCount(stageId) {
+  return (deals.kanbanData.deals[stageId] || []).length
+}
 </script>
 
 <template>
   <div class="h-full flex flex-col">
     <!-- Header -->
-    <div class="flex items-center justify-between px-6 py-4 border-b border-pulse-border bg-pulse-card">
+    <div class="flex flex-col sm:flex-row sm:items-center justify-between gap-4 px-4 sm:px-6 py-4 border-b border-pulse-border bg-pulse-card">
       <div>
         <h1 class="text-xl font-bold text-white">Sales Pipeline</h1>
         <p class="text-sm text-pulse-muted">{{ deals.currentPipeline?.name || 'Loading...' }}</p>
       </div>
-      <button @click="showNewDealModal = true" class="btn-primary">
+      <button @click="showNewDealModal = true" class="btn-primary w-full sm:w-auto">
         <svg class="w-5 h-5 mr-2" fill="none" viewBox="0 0 24 24" stroke="currentColor">
           <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4" />
         </svg>
@@ -91,16 +100,97 @@ function calculateStageValue(stageId) {
       </button>
     </div>
 
-    <!-- Kanban Board -->
-    <div class="flex-1 overflow-x-auto p-6">
-      <div v-if="deals.loading" class="flex items-center justify-center h-64">
-        <svg class="animate-spin h-8 w-8 text-primary-500" fill="none" viewBox="0 0 24 24">
-          <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
-          <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path>
-        </svg>
-      </div>
+    <!-- Loading -->
+    <div v-if="deals.loading" class="flex-1 flex items-center justify-center">
+      <svg class="animate-spin h-8 w-8 text-primary-500" fill="none" viewBox="0 0 24 24">
+        <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+        <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path>
+      </svg>
+    </div>
 
-      <div v-else class="flex gap-4 h-full min-w-max">
+    <!-- Mobile Stage Tabs -->
+    <div v-if="!deals.loading" class="md:hidden border-b border-pulse-border bg-pulse-card">
+      <div class="flex overflow-x-auto px-4 py-2 gap-2 -mx-4">
+        <button
+          v-for="(stage, index) in deals.kanbanData.stages"
+          :key="stage.id"
+          @click="mobileSelectedStage = stage.id"
+          :class="[
+            'flex items-center gap-2 px-3 py-2 rounded-lg whitespace-nowrap transition-colors flex-shrink-0',
+            mobileSelectedStage === stage.id 
+              ? 'bg-primary-500 text-white' 
+              : 'bg-pulse-dark text-pulse-muted'
+          ]"
+        >
+          <div :class="['w-2 h-2 rounded-full', getStageColor(index, deals.kanbanData.stages.length)]"></div>
+          <span class="text-sm font-medium">{{ stage.name }}</span>
+          <span class="text-xs bg-black/20 px-1.5 py-0.5 rounded">
+            {{ getStageDealsCount(stage.id) }}
+          </span>
+        </button>
+      </div>
+    </div>
+
+    <!-- Mobile Deals List -->
+    <div v-if="!deals.loading" class="md:hidden flex-1 overflow-y-auto p-4">
+      <div class="mb-4 flex items-center justify-between">
+        <p class="text-sm text-pulse-muted">
+          {{ formatCurrency(calculateStageValue(mobileSelectedStage)) }} in dieser Phase
+        </p>
+      </div>
+      
+      <div class="space-y-3">
+        <div
+          v-for="deal in deals.kanbanData.deals[mobileSelectedStage] || []"
+          :key="deal.id"
+          class="card p-4 active:scale-[0.98] transition-transform"
+        >
+          <div class="flex items-start justify-between mb-2">
+            <h4 class="font-medium text-white">{{ deal.title }}</h4>
+            <span class="text-sm font-semibold text-green-400">
+              {{ formatCurrency(deal.value) }}
+            </span>
+          </div>
+          
+          <div v-if="deal.company" class="text-sm text-pulse-muted mb-1">
+            🏢 {{ deal.company.name }}
+          </div>
+          
+          <div v-if="deal.contact" class="text-sm text-pulse-muted mb-2">
+            👤 {{ deal.contact.name }}
+          </div>
+
+          <div class="flex items-center justify-between text-xs">
+            <span v-if="deal.expectedCloseDate" class="text-pulse-muted">
+              📅 {{ new Date(deal.expectedCloseDate).toLocaleDateString('de-DE') }}
+            </span>
+            <span v-if="deal.probability" :class="[
+              'px-2 py-0.5 rounded-full',
+              deal.probability >= 70 ? 'bg-green-500/20 text-green-400' :
+              deal.probability >= 40 ? 'bg-yellow-500/20 text-yellow-400' :
+              'bg-red-500/20 text-red-400'
+            ]">
+              {{ deal.probability }}%
+            </span>
+          </div>
+        </div>
+
+        <!-- Empty State -->
+        <div 
+          v-if="!(deals.kanbanData.deals[mobileSelectedStage] || []).length"
+          class="flex flex-col items-center justify-center py-12 text-pulse-muted"
+        >
+          <svg class="w-12 h-12 mb-3 opacity-50" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M20 13V6a2 2 0 00-2-2H6a2 2 0 00-2 2v7m16 0v5a2 2 0 01-2 2H6a2 2 0 01-2-2v-5m16 0h-2.586a1 1 0 00-.707.293l-2.414 2.414a1 1 0 01-.707.293h-3.172a1 1 0 01-.707-.293l-2.414-2.414A1 1 0 006.586 13H4" />
+          </svg>
+          <p>Keine Deals in dieser Phase</p>
+        </div>
+      </div>
+    </div>
+
+    <!-- Desktop Kanban Board -->
+    <div v-if="!deals.loading" class="hidden md:block flex-1 overflow-x-auto p-6">
+      <div class="flex gap-4 h-full min-w-max">
         <div
           v-for="(stage, index) in deals.kanbanData.stages"
           :key="stage.id"
@@ -114,7 +204,7 @@ function calculateStageValue(stageId) {
               <div :class="['w-3 h-3 rounded-full', getStageColor(index, deals.kanbanData.stages.length)]"></div>
               <h3 class="font-semibold text-white">{{ stage.name }}</h3>
               <span class="text-xs text-pulse-muted bg-pulse-card px-2 py-0.5 rounded-full">
-                {{ (deals.kanbanData.deals[stage.id] || []).length }}
+                {{ getStageDealsCount(stage.id) }}
               </span>
             </div>
             <p class="text-sm text-pulse-muted">
@@ -178,13 +268,20 @@ function calculateStageValue(stageId) {
 
     <!-- New Deal Modal -->
     <Teleport to="body">
-      <div v-if="showNewDealModal" class="fixed inset-0 z-50 flex items-center justify-center">
+      <div v-if="showNewDealModal" class="fixed inset-0 z-50 flex items-end sm:items-center justify-center p-0 sm:p-4">
         <div class="absolute inset-0 bg-black/60" @click="showNewDealModal = false"></div>
-        <div class="relative card w-full max-w-md mx-4">
-          <div class="px-6 py-4 border-b border-pulse-border">
-            <h2 class="text-lg font-semibold text-white">Neuer Deal</h2>
+        <div class="relative card w-full sm:max-w-md rounded-b-none sm:rounded-b-xl max-h-[90vh] overflow-y-auto">
+          <div class="px-4 sm:px-6 py-4 border-b border-pulse-border sticky top-0 bg-pulse-card z-10">
+            <div class="flex items-center justify-between">
+              <h2 class="text-lg font-semibold text-white">Neuer Deal</h2>
+              <button @click="showNewDealModal = false" class="p-2 text-pulse-muted hover:text-white sm:hidden">
+                <svg class="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
+                </svg>
+              </button>
+            </div>
           </div>
-          <form @submit.prevent="createDeal" class="p-6 space-y-4">
+          <form @submit.prevent="createDeal" class="p-4 sm:p-6 space-y-4">
             <div>
               <label class="label">Titel *</label>
               <input v-model="newDeal.title" type="text" class="input" placeholder="z.B. Website Redesign" required />
@@ -197,7 +294,7 @@ function calculateStageValue(stageId) {
               <label class="label">Erwarteter Abschluss</label>
               <input v-model="newDeal.expectedCloseDate" type="date" class="input" />
             </div>
-            <div class="flex gap-3 pt-2">
+            <div class="flex flex-col-reverse sm:flex-row gap-3 pt-2">
               <button type="button" @click="showNewDealModal = false" class="btn-secondary flex-1">
                 Abbrechen
               </button>