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

    # Health — Docker healthcheck + Traefik
    location = /health {
        access_log off;
        default_type text/plain;
        return 200 "ok\n";
    }

    gzip on;
    gzip_types text/css application/javascript application/json image/svg+xml;
    gzip_min_length 256;

    location /assets/ {
        expires 7d;
        add_header Cache-Control "public, immutable";
    }

    # SPA — React Router
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Segurança básica
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
}