server {
    listen       80;
    server_name  _;

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

    # Cache hashed static assets aggressively.
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    # Client-side routing: fall back to index.html for unknown paths.
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Basic gzip for text assets.
    gzip on;
    gzip_types text/plain text/css application/javascript application/json image/svg+xml;
    gzip_min_length 1024;
}