server {
    listen 80;
    server_name localhost;

    location = / {
        return 301 /serial/;
    }

    location /serial/ {
        alias /usr/share/nginx/html/serial/;
        try_files $uri $uri/ /serial/index.html;
    }

    # Health check endpoint (optional but good for deployments)
    location /health {
        access_log off;
        add_header 'Content-Type' 'text/plain';
        return 200 "healthy\n";
    }
}