diff --git a/src/renderer/index.tsx b/src/renderer/index.tsx
index 8864218..e18b0c2 100644
--- a/src/renderer/index.tsx
+++ b/src/renderer/index.tsx
@@ -1,9 +1,18 @@
 import { createRoot } from 'react-dom/client';
 import App from './App';
 
+import { ThemeProvider, CssBaseline } from '@mui/material';
+import { defaultTheme } from '../theme/themes'; // <-- поправь путь, если themes.ts лежит в другом месте
+
 const container = document.getElementById('root') as HTMLElement;
 const root = createRoot(container);
-root.render(<App />);
+
+root.render(
+  <ThemeProvider theme={defaultTheme}>
+    <CssBaseline />
+    <App />
+  </ThemeProvider>,
+);
 
 // calling IPC exposed from preload script
 window.electron?.ipcRenderer.once('ipc-example', (arg) => {
diff --git a/src/theme/themes.ts b/src/theme/themes.ts
new file mode 100644
index 0000000..f64a55a
--- /dev/null
+++ b/src/theme/themes.ts
@@ -0,0 +1,173 @@
+import { createTheme, SxProps, Theme } from '@mui/material/styles';
+
+declare module '@mui/material/styles' {
+  interface Theme {
+    launcher: {
+      fonts: {
+        default: string;
+      };
+
+      topbar: {
+        firstBox: {
+          background: string;
+          backdropFilter: string;
+          boxShadow: string;
+        };
+        backButton: {
+          transition: string;
+          '&:hover': {
+            transform: string;
+          };
+        };
+        tabsBox: {
+          borderColor: string;
+        };
+        tabs: SxProps<Theme>;
+        tabBase: SxProps<Theme>;
+        tabActive: SxProps<Theme>;
+        menuPaper: SxProps<Theme>;
+        menuDivider: SxProps<Theme>;
+        menuItem: SxProps<Theme>;
+        menuUsername: SxProps<Theme>;
+        logoutButton: SxProps<Theme>;
+        windowControlIcon: {
+          color: string;
+        };
+        windowControlButton: SxProps<Theme>;
+      };
+    };
+  }
+
+  interface ThemeOptions {
+    launcher?: Theme['launcher'];
+  }
+}
+
+export const defaultTheme = createTheme({
+  palette: {
+    mode: 'dark',
+    primary: { main: '#F27121' },
+    secondary: { main: '#E940CD' },
+    text: {
+      primary: '#FFFFFF',
+      secondary: 'rgba(255,255,255,0.7)',
+    },
+  },
+
+  launcher: {
+    fonts: {
+      default: 'Benzin-Bold',
+    },
+
+    topbar: {
+      firstBox: {
+        background:
+          'linear-gradient(71deg, rgba(242,113,33,0.18) 0%, rgba(233,64,205,0.14) 70%, rgba(138,35,135,0.16) 100%)',
+        backdropFilter: 'blur(10px)',
+        boxShadow: '0 8px 30px rgba(0,0,0,0.35)',
+      },
+      backButton: {
+        transition: 'transform 0.3s ease',
+        '&:hover': {
+          transform: 'scale(1.2)',
+        },
+      },
+      tabsBox: {
+        borderColor: 'transparent',
+      },
+      tabs: {
+        // один градиент на весь Tabs
+        '--tabs-grad':
+          'linear-gradient(90deg, #F27121 0%, #E940CD 50%, #8A2387 100%)',
+
+        // активный текст показывает “срез” общего градиента
+        '& .MuiTab-root.Mui-selected': {
+          color: 'transparent',
+          backgroundImage: 'var(--tabs-grad)',
+          backgroundRepeat: 'no-repeat',
+          backgroundSize: 'var(--tabs-w) 100%',
+          backgroundPosition: 'calc(-1 * var(--active-x)) 0',
+          WebkitBackgroundClip: 'text',
+          backgroundClip: 'text',
+        },
+
+        // подчёркивание тоже из того же “единого” градиента
+        '& .MuiTabs-indicator': {
+          height: '2px',
+          backgroundImage: 'var(--tabs-grad)',
+          backgroundRepeat: 'no-repeat',
+          backgroundSize: 'var(--tabs-w) 100%',
+          backgroundPosition: 'calc(-1 * var(--active-x)) 0',
+        },
+      },
+      tabBase: (theme: Theme) => ({
+        color: 'white',
+        fontFamily: theme.launcher.fonts.default,
+        transition: 'all 0.3s ease',
+        '&:hover': {
+          color: 'rgb(170, 170, 170)',
+        },
+      }),
+      tabActive: {
+        color: 'transparent',
+        WebkitTextFillColor: 'transparent',
+        backgroundImage: 'var(--tabs-grad)',
+        backgroundRepeat: 'no-repeat',
+        backgroundSize: 'var(--tabs-w) 100%',
+        backgroundPosition: 'calc(-1 * var(--active-x)) 0',
+        WebkitBackgroundClip: 'text',
+        backgroundClip: 'text',
+      },
+      menuPaper: {
+        color: 'white',
+        bgcolor: 'rgba(0,0,0,0.82)',
+        backdropFilter: 'blur(10px)',
+        border: '1px solid rgba(233,64,205,0.25)',
+        boxShadow: '0 18px 40px rgba(0,0,0,0.55)',
+      },
+
+      menuDivider: {
+        borderColor: 'rgba(255,255,255,0.08)',
+      },
+
+      menuItem: (theme: Theme) => ({
+        fontFamily: theme.launcher.fonts.default,
+        '&:hover': {
+          bgcolor: 'rgba(255,77,77,0.15)',
+        },
+      }),
+
+      menuUsername: (theme: Theme) => ({
+        fontFamily: theme.launcher.fonts.default,
+        color: theme.palette.text.primary,
+      }),
+
+      logoutButton: (theme: Theme) => ({
+        fontFamily: theme.launcher.fonts.default,
+        background:
+          'linear-gradient(71deg, #F27121 0%, #E940CD 70%, #8A2387 100%)',
+        color: theme.palette.text.primary,
+        border: 'none',
+        transition: 'transform 0.3s ease',
+        '&:hover': {
+          background:
+            'linear-gradient(71deg, #F27121 0%, #E940CD 70%, #8A2387 100%)',
+          transform: 'scale(1.01)',
+          boxShadow: '0 4px 15px rgba(242, 113, 33, 0.4)',
+        },
+        boxShadow: '0 2px 8px rgba(0, 0, 0, 0.3)',
+      }),
+
+      windowControlIcon: {
+        color: 'white',
+      },
+
+      windowControlButton: {
+        // тут только “визуал”, размеры оставим в TopBar
+        '&:hover': {
+          bgcolor: 'rgba(255,255,255,0.06)',
+        },
+      },
+    },
+  },
+});