server {
    listen 80;
    
    # 1. Serve React Frontend (Static Files)
    location / {
        root /usr/share/nginx/html;
        index index.html index.htm;
        try_files $uri $uri/ /index.html; # Support for React Router (SPA)
    }

    # 2. Proxy API Requests to Backend Container
    location /api/ {
        # 'market-backend' is the service name in docker-compose.yml
        # Port 3001 is where the Node.js bridge listens
        proxy_pass http://market-backend:3001/api/;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}