server {
    listen 80;
    server_name _;

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

    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # CSP — allows Anthropic API calls and Google Fonts
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data: blob:; connect-src 'self' https://api.anthropic.com; worker-src blob:;" always;

    gzip on;
    gzip_types text/html text/css application/javascript;
    gzip_min_length 1024;

    location /health {
        access_log off;
        return 200 "ok\n";
        add_header Content-Type text/plain;
    }

    location / {
        try_files $uri $uri/ /index.html;
        expires -1;
        add_header Cache-Control "no-store, no-cache, must-revalidate";
    }

    location ~* \.(js|css|png|jpg|jpeg|gif|ico|woff2)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }
}