.arena-background{background:#11120c}.arena-background,.arena-still{position:fixed;inset:0;pointer-events:none}.arena-still{background:#11120c url(/login-bg.webp) 50%/cover no-repeat}.arena-scene{opacity:0;visibility:hidden;transition:opacity .3s ease}.arena-scene.is-ready{opacity:1;visibility:visible}@media(prefers-reduced-motion:reduce){.arena-scene{transition:none}}