server {
    listen 80;
    server_name _;

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

    # Gzip for static assets
    gzip on;
    gzip_types text/css application/javascript application/json image/svg+xml;
    gzip_min_length 1024;

    # Forward API calls to the api service (same Docker network).
    # The prefix /api is preserved, which is what the API server expects.
    location /api/ {
        proxy_pass http://api:8080;
        proxy_http_version 1.1;
        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_set_header X-Forwarded-Proto $scheme;
    }

    # SPA fallback — let the client router handle unknown paths.
    location / {
        try_files $uri $uri/ /index.html;
    }
}