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

    # Serve dashboard.html as the index
    location / {
        try_files /dashboard.html =404;
    }

    # Cache static assets
    location ~* \.(html|css|js)$ {
        expires 5m;
        add_header Cache-Control "public, no-transform";
    }

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;

    # Gzip
    gzip on;
    gzip_types text/html text/css application/javascript;
}