server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # Proxy API requests to backend
    location /api/ {
        proxy_pass http://backend:3001;
        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;
    }

    # SPA fallback
    location / {
        try_files $uri $uri/ /index.html;
    }

    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml;
}