server {
    listen 80;
    server_name _;

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

    # SPA fallback: TanStack Router handles routing client-side, so any
    # unknown path must serve index.html instead of returning 404.
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Long cache for hashed build assets (safe: filenames change on rebuild)
    location /assets/ {
        expires 30d;
        add_header Cache-Control "public, immutable";
    }
}