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

    # Serve static assets with long cache
    location ~* \.(js|css|png|jpg|svg|ico|woff2?)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    # SPA fallback: return index.html for any path
    # React Router (with basename=/networkview) handles routing client-side
    location / {
        try_files $uri /index.html;
    }
}