server {
    listen 80;
    listen [::]:80;
    server_name _; # Catch-all

    location /.well-known/acme-challenge/ {
        root /var/www/html;
        try_files $uri =404;
    }

    # Redirect ALL HTTP traffic to HTTPS (using the original host)
    location / {
        return 301 https://$host$request_uri;
    }
}