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

    # Gzip compression
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml;

    # React router - serve index.html for all routes
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Cache static assets
    location /static/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # Proxy API requests to backend
    location /api/ {
        proxy_pass http://backend:5000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_cache_bypass $http_upgrade;
    }

    # Proxy ticket/upload files
    location /uploads/ { proxy_pass http://backend:5000; }
    location /tickets/ { proxy_pass http://backend:5000; }
}