nginx.conf

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

    # Serve static assets with long cache
    location /assets/ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # Client-side routing — send all requests to index.html
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "no-referrer" always;
    add_header Content-Security-Policy "default-src 'self'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; script-src 'self'; connect-src 'none'; img-src 'self' data:; object-src 'none'; frame-src 'none'" always;
}