server {
    listen 80;
    server_name _;

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

    # Health probe (checked by Docker + Caddy)
    location /health {
        return 200 'ok';
        add_header Content-Type text/plain;
    }

    # SPA fallback — any path that isn't a real file serves index.html
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Static asset caching
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff2?)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    gzip on;
    gzip_types text/plain text/css application/javascript application/json image/svg+xml;
    gzip_min_length 1024;
}