server {
    listen 80;
    
    # Compressione Gzip per performance
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

    location / {
        root /usr/share/nginx/html;
        index index.html index.htm;
        # Importante per React Router: se il file non esiste, serve index.html
        try_files $uri $uri/ /index.html;
    }

    location /api {
        # 'backend' è il nome del servizio nel docker-compose
        proxy_pass http://backend:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}