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

    # Gzip
    gzip on;
    gzip_types text/plain text/css application/javascript application/json image/svg+xml;

    # PWA – all routes fall back to index.html
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Cache hashed assets aggressively
    location ~* \.(js|css|woff2|png|ico|svg)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # Never cache the service worker or manifest
    location ~* (service-worker\.js|manifest\.webmanifest)$ {
        expires off;
        add_header Cache-Control "no-store";
    }
}