diff --git a/scripts/build-styles.js b/scripts/build-styles.js
new file mode 100644
index 0000000..8a02d4a
--- /dev/null
+++ b/scripts/build-styles.js
@@ -0,0 +1,36 @@
+import sass from 'sass';
+import { writeFileSync, mkdirSync } from 'fs';
+import { resolve, dirname } from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+
+// Compilar SCSS para CSS
+function compileSass(inputFile, outputFile) {
+  try {
+    const result = sass.compile(inputFile, {
+      style: 'compressed',
+      loadPaths: [resolve(__dirname, '../src/styles')]
+    });
+
+    // Criar diretório de saída se não existir
+    mkdirSync(dirname(outputFile), { recursive: true });
+
+    // Escrever arquivo CSS
+    writeFileSync(outputFile, result.css);
+    console.log(`SCSS compilado: ${inputFile} -> ${outputFile}`);
+  } catch (error) {
+    console.error(`Erro ao compilar SCSS ${inputFile}:`, error);
+  }
+}
+
+// Compilar arquivos
+compileSass(
+  resolve(__dirname, '../src/styles/content.scss'),
+  resolve(__dirname, '../dist/styles/content.css')
+);
+
+compileSass(
+  resolve(__dirname, '../src/styles/custom.scss'),
+  resolve(__dirname, '../dist/styles/custom.css')
+); 
\ No newline at end of file
diff --git a/src/background/index.ts b/src/background/index.ts
index e186e46..ae3f331 100644
--- a/src/background/index.ts
+++ b/src/background/index.ts
@@ -1,8 +1,46 @@
-let currentPostData = {};
-let authToken: string | null = null;
-let negocios_id: string | null = null;
-let negocios_nome: string | null = null;
-let user_id: string | null = null;
+import { MessagePayload, MessageTypes, AuthState, SavePostData } from '../types/messages';
+
+const initialAuthState: AuthState = {
+  isAuthenticated: false,
+  token: null,
+  businessId: null,
+  businessName: null,
+  userId: null
+};
+
+let authState: AuthState = { ...initialAuthState };
+
+// Handler de mensagens tipado
+function handleMessage(
+  message: MessagePayload, 
+  sender: chrome.runtime.MessageSender,
+  sendResponse: (response: { success: boolean; error?: string; data?: unknown }) => void
+): boolean {
+  switch (message.type) {
+    case MessageTypes.SAVE_POST:
+      handleSavePost(message.data as SavePostData, sendResponse);
+      break;
+      
+    case MessageTypes.CHECK_AUTH:
+      sendResponse({ success: true, data: authState.isAuthenticated });
+      break;
+      
+    case MessageTypes.LOGIN:
+      handleLogin(message.data as { email: string; password: string }, sendResponse);
+      break;
+      
+    case MessageTypes.LOGOUT:
+      handleLogout(sendResponse);
+      break;
+      
+    default:
+      sendResponse({ success: false, error: 'Tipo de mensagem não suportado' });
+  }
+  
+  return true; // Indica que a resposta será assíncrona
+}
+
+chrome.runtime.onMessage.addListener(handleMessage);
 
 // URL base da API do Bubble no Launchr
 const API_URL = 'https://launchr.com.br/api/1.1/wf';
@@ -14,8 +52,8 @@ let loginWindowId: number | null = null;
 const checkAuth = (): Promise<boolean> => {
   return new Promise((resolve) => {
     chrome.storage.local.get(['authToken'], (result) => {
-      authToken = result.authToken;
-      resolve(!!authToken);
+      authState.token = result.authToken;
+      resolve(!!authState.token);
     });
   });
 };
@@ -48,29 +86,6 @@ chrome.windows.onRemoved.addListener((windowId) => {
   }
 });
 
-// Listener para mensagens do content script e popup
-chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
-  if (request.type === 'SAVE_POST' || request.type === 'SAVE_IDEA') {
-    checkAuth().then(isAuthenticated => {
-      if (!isAuthenticated) {
-        openLoginPopup();
-        sendResponse({ success: false, error: 'AUTH_REQUIRED' });
-      } else {
-        // Implementar lógica de salvamento
-        handleSaveRequest(request, sendResponse);
-      }
-    });
-    return true; // Indica que a resposta será assíncrona
-  }
-  
-  if (request.type === 'CHECK_AUTH') {
-    checkAuth().then(isAuthenticated => {
-      sendResponse({ isAuthenticated });
-    });
-    return true;
-  }
-});
-
 // Listener para o clique no ícone da extensão
 chrome.action.onClicked.addListener(async () => {
   const isAuthenticated = await checkAuth();
@@ -97,7 +112,7 @@ const handleSaveRequest = async (request: any, sendResponse: (response: any) =>
       method: 'POST',
       headers: {
         'Content-Type': 'application/json',
-        'Authorization': authToken || ''
+        'Authorization': authState.token || ''
       },
       body: JSON.stringify(request.data)
     });
@@ -106,7 +121,7 @@ const handleSaveRequest = async (request: any, sendResponse: (response: any) =>
       if (response.status === 401) {
         // Token inválido ou expirado
         chrome.storage.local.remove(['authToken']);
-        authToken = null;
+        authState.token = null;
         openLoginPopup();
         sendResponse({ success: false, error: 'AUTH_REQUIRED' });
         return;
diff --git a/src/popup/index.tsx b/src/popup/index.tsx
index f401fad..4feb584 100644
--- a/src/popup/index.tsx
+++ b/src/popup/index.tsx
@@ -1,14 +1,16 @@
 import React from 'react';
-import ReactDOM from 'react-dom/client';
 import { Provider } from 'react-redux';
 import { store } from '../store';
-import Router from './Router';
-import '../index.css';
+import { PopupApp } from './components/PopupApp';
 
-ReactDOM.createRoot(document.getElementById('root')!).render(
-  <React.StrictMode>
+import '../styles/custom.scss';
+
+function Popup() {
+  return (
     <Provider store={store}>
-      <Router />
+      <PopupApp />
     </Provider>
-  </React.StrictMode>
-); 
\ No newline at end of file
+  );
+}
+
+export default Popup; 
\ No newline at end of file
diff --git a/src/styles/content.scss b/src/styles/content.scss
new file mode 100644
index 0000000..d26a3f9
--- /dev/null
+++ b/src/styles/content.scss
@@ -0,0 +1,56 @@
+// Variáveis do tema
+@import "variables";
+
+// Estilos do botão
+.launchr {
+  &-save-button {
+    background: none;
+    border: none;
+    padding: $spacer * 0.5;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    transition: $transition-base;
+    margin-right: $spacer;
+    border-radius: $border-radius;
+
+    &:hover {
+      background-color: rgba($black, 0.05);
+    }
+
+    &.saving {
+      opacity: 0.7;
+      cursor: wait;
+    }
+
+    &.saved {
+      background-color: rgba($primary, 0.1);
+    }
+  }
+
+  &-icon {
+    width: 20px;
+    height: 20px;
+    border-radius: $border-radius-sm;
+  }
+
+  &-save-button-container {
+    display: inline-flex;
+    align-items: center;
+    margin-left: $spacer;
+  }
+}
+
+// Ajustes para o LinkedIn
+.feed-shared-control-menu,
+.feed-shared-update-v2__control-menu {
+  .launchr-save-button {
+    position: relative;
+    z-index: 2;
+  }
+
+  .display-flex {
+    align-items: center;
+  }
+} 
\ No newline at end of file
diff --git a/src/styles/custom.scss b/src/styles/custom.scss
new file mode 100644
index 0000000..6ed831d
--- /dev/null
+++ b/src/styles/custom.scss
@@ -0,0 +1,36 @@
+@import "variables";
+@import "bootstrap/scss/bootstrap";
+
+// Estilos personalizados da extensão
+.launchr {
+  &-container {
+    width: 400px;
+    min-height: 500px;
+    max-height: 600px;
+    overflow-y: auto;
+  }
+
+  &-header {
+    padding: $spacer;
+    border-bottom: 1px solid $border-color;
+    background-color: $white;
+  }
+
+  &-content {
+    padding: $spacer;
+  }
+
+  &-save-button {
+    @extend .btn;
+    @extend .btn-primary;
+    
+    &--saving {
+      opacity: 0.7;
+      cursor: wait;
+    }
+    
+    &--saved {
+      @extend .btn-success;
+    }
+  }
+} 
\ No newline at end of file
diff --git a/src/styles/variables.scss b/src/styles/variables.scss
new file mode 100644
index 0000000..bd7ede3
--- /dev/null
+++ b/src/styles/variables.scss
@@ -0,0 +1,21 @@
+// Sobrescrita de variáveis Bootstrap
+$primary: #4F46E5;
+$primary-hover: #4338CA;
+
+// Cores personalizadas
+$launchr-colors: (
+  "primary": $primary,
+  "primary-hover": $primary-hover,
+  "error": #EF4444,
+  "success": #10B981
+);
+
+// Configurações do tema
+$enable-shadows: true;
+$enable-gradients: false;
+$enable-responsive-font-sizes: true;
+
+// Configurações de componentes
+$border-radius: 0.375rem;
+$btn-border-radius: $border-radius;
+$input-border-radius: $border-radius; 
\ No newline at end of file
diff --git a/src/types/messages.d.ts b/src/types/messages.d.ts
new file mode 100644
index 0000000..0f63536
--- /dev/null
+++ b/src/types/messages.d.ts
@@ -0,0 +1,30 @@
+export interface MessagePayload {
+  type: MessageTypes;
+  data: unknown;
+}
+
+export const MessageTypes = {
+  SAVE_POST: 'SAVE_POST',
+  SAVE_IDEA: 'SAVE_IDEA',
+  CHECK_AUTH: 'CHECK_AUTH',
+  LOGIN: 'LOGIN',
+  LOGOUT: 'LOGOUT'
+} as const;
+
+export type MessageTypes = typeof MessageTypes[keyof typeof MessageTypes];
+
+export interface AuthState {
+  isAuthenticated: boolean;
+  token: string | null;
+  businessId: string | null;
+  businessName: string | null;
+  userId: string | null;
+}
+
+export interface SavePostData {
+  title: string;
+  content: string;
+  author: string;
+  authorProfileLink?: string;
+  postLink?: string;
+} 
\ No newline at end of file