server {
    listen       80;
    server_name  _;
    root         /usr/share/nginx/html;
    index        index.html;
    charset      utf-8;

    gzip             on;
    gzip_types       text/plain text/css application/json application/javascript image/svg+xml;
    gzip_min_length  256;

    # Long-cache static assets (CSS, JS, images, fonts)
    location ~* \.(css|js|woff2?|ttf|otf|eot|svg|webp|png|jpg|jpeg|ico|gif)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        add_header Vary Accept-Encoding;
    }

    # HTML pages — no-cache so updates are picked up immediately
    location ~* \.html$ {
        add_header Cache-Control "no-cache, must-revalidate";
    }

    # SPA-style routing: serve index.html for unknown paths
    location / {
        try_files $uri $uri/ $uri.html =404;
    }

    error_page 404 /404.html;
}