server {
    listen ${PORT};
    server_name localhost;
    root /app/www;

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN";
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Content-Type-Options "nosniff";

    # Compression
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

    location / {
        try_files $uri $uri/ /index.html;
        expires -1;
    }

    # Cache static assets
    location /assets {
        expires 1y;
        add_header Cache-Control "public, no-transform";
    }
}