mariavel/frontend/src/components/Header.tsx

import React from 'react';
import { AppBar, Toolbar, Typography, IconButton, Box } from '@mui/material';
import { Brightness4, Brightness7, Settings } from '@mui/icons-material';
import { useAppStore } from '../store/useAppStore';

const Header: React.FC = () => {
  const { darkMode, toggleDarkMode } = useAppStore();

  return (
    <AppBar 
      position="static" 
      elevation={0} 
      sx={{ 
        borderBottom: 1, 
        borderColor: 'divider',
        bgcolor: darkMode ? 'rgba(16, 24, 48, 0.95)' : 'rgba(255, 255, 255, 0.95)',
        color: darkMode ? '#f1f5f9' : '#1e293b',
        backdropFilter: 'blur(10px)',
        zIndex: (theme) => theme.zIndex.drawer + 1
      }}
    >
      <Toolbar>
        <Typography variant="h6" sx={{ flexGrow: 1, fontWeight: 800, color: 'primary.main', letterSpacing: -1 }}>
          MARIAVEL
        </Typography>
        <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
          <IconButton onClick={toggleDarkMode} color="inherit" sx={{ opacity: 0.8, '&:hover': { opacity: 1 } }}>
            {darkMode ? <Brightness7 /> : <Brightness4 />}
          </IconButton>
          <IconButton color="inherit" sx={{ opacity: 0.8, '&:hover': { opacity: 1 } }}>
            <Settings />
          </IconButton>
        </Box>
      </Toolbar>
    </AppBar>
  );
};

export default Header;