RewriteEngine On

# ============================================================
# Wildcard subdomain routing for *.horizon.centraljuan.com
# Maps: <client>.horizon.centraljuan.com → /<client>/
# ============================================================
RewriteCond %{HTTP_HOST} ^([a-z0-9_]+)\.horizon\.centraljuan\.com$ [NC]
RewriteCond %{REQUEST_URI} !^/%1/ [NC]
RewriteRule ^(.*)$ /%1/$1 [L,QSA]