:root{--brand-cyan:#0cf;--brand-navy:#003f66;--btn-bg:#0cf;--btn-text:#fff;--btn-bg-hover:#000;--btn-text-hover:#0cf;--btn-border:#0cf;--btn-radius:50px;--btn-shadow:0 4px 8px rgba(0,0,0,.2);--btn-shadow-hover:0 6px 12px rgba(0,0,0,.3);--btn-padding:12px 28px;--btn-font-size:1rem;--btn-font-weight:600;--btn-letter-spacing:0;--overlay-size:clamp(20px,2.6vw,25px);--overlay-gap:20px;--overlay-offset:10px;--shadow-dark-1:#111;--shadow-dark-2:#222}