:root{--brand-primary: #2563eb;--brand-secondary: #1e40af;--brand-accent: #3b82f6}:root[data-subdomain=served]{--brand-primary: #1a365d;--brand-secondary: #2c5282;--brand-accent: #3182ce}[data-subdomain=served] header{background:linear-gradient(135deg,#1a365d,#2c5282);color:#fff}[data-subdomain=served] header a{color:#fff}[data-subdomain=served] header a:hover{color:#e2e8f0}