server {
    listen 5173;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

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

    # Immutable fingerprinted assets
    location /assets/ {
        expires 30d;
        add_header Cache-Control "public, immutable";
    }

    # The service worker must never be cached, or the PWA can never update
    location = /sw.js {
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # SPA fallback — React Router owns the paths
    location / {
        try_files $uri $uri/ /index.html;
    }
}