.canvas{position:relative}
.canvas::after{content:"OptiKes DEMO";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font:700 clamp(40px,9vw,140px)/1 system-ui,sans-serif;color:rgba(30,60,110,.07);transform:rotate(-18deg);pointer-events:none;z-index:3;letter-spacing:.06em}
.demo-band{position:fixed;left:50%;bottom:10px;transform:translateX(-50%);z-index:50;background:#2b3239;color:#fff;font:13px system-ui,sans-serif;padding:7px 14px;border-radius:18px;box-shadow:0 4px 14px rgba(0,0,0,.25)}
.demo-band a{color:#ffc93c;font-weight:600;margin-left:8px;text-decoration:none}