server {
    listen 80;
    server_name _;

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

    # Enable gzip
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml+rss application/json application/javascript;

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;

    # CORS for widget embedding
    add_header Access-Control-Allow-Origin "*" always;
    add_header Access-Control-Allow-Methods "GET, POST, OPTIONS" always;
    add_header Access-Control-Allow-Headers "Content-Type, Authorization" always;

    # Widget loader script
    location /widget.js {
        add_header Content-Type "application/javascript";
        expires 1h;
    }

    # Static assets
    location / {
        try_files $uri $uri/ /index.html;
        expires 1h;
        add_header Cache-Control "public, immutable";
    }

    # Health check
    location /health {
        access_log off;
        return 200 "healthy\n";
        add_header Content-Type text/plain;
    }
}