server {
    listen 80;
    server_name localhost;

    root /usr/share/nginx/html;
    index index.html;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 10240;
    gzip_proxied expired no-cache no-store private auth;
    gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml;
    gzip_disable "MSIE [1-6]\.";

    # Try files for React Router
    location / {
        try_files $uri $uri/ /index.html;
        
        # Add security headers
        add_header X-Frame-Options "SAMEORIGIN";
        add_header X-XSS-Protection "1; mode=block";
        add_header X-Content-Type-Options "nosniff";
        
        # Don't cache index.html
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # Cache static assets
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff2|woff|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, no-transform";
    }
}