.back-to-top-btn{position:fixed;left:max(20px,env(safe-area-inset-left,0px));bottom:calc(max(20px,env(safe-area-inset-bottom,0px)) + var(--cbs-dock-h,0px));width:62px;height:62px;border-radius:50%;display:flex;align-items:center;justify-content:center;padding:0;margin:0;border:0;cursor:pointer;z-index:1075;color:var(--primary-foreground,#ffffff);background:linear-gradient( 145deg,color-mix(in srgb,var(--primary-light,var(--primary)) 92%,#ffffff 8%) 0%,var(--primary) 48%,color-mix(in srgb,var(--primary) 70%,var(--cbs-brand-900,#15101b) 30%) 100% );box-shadow:0 0 0 1px rgba(255,255,255,0.22) inset,0 14px 30px color-mix(in srgb,var(--primary) 42%,transparent),0 6px 14px rgba(0,0,0,0.2);opacity:0;visibility:hidden;pointer-events:none;transform:translateY(10px) scale(0.94);transition:opacity 0.28s ease,visibility 0.28s ease,transform 0.28s ease,box-shadow 0.2s ease,filter 0.2s ease}.back-to-top-btn.is-visible{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0) scale(1)}.back-to-top-btn__icon{width:1.75rem;height:1.75rem;flex-shrink:0;filter:drop-shadow(0 1px 1px rgba(0,0,0,0.2))}.back-to-top-btn:hover{filter:brightness(1.06);color:var(--primary-foreground,#ffffff);box-shadow:0 0 0 1px rgba(255,255,255,0.28) inset,0 18px 36px color-mix(in srgb,var(--primary) 48%,transparent),0 9px 20px rgba(0,0,0,0.22)}.back-to-top-btn.is-visible:hover{transform:translateY(-2px) scale(1.03)}.back-to-top-btn:focus-visible{outline:3px solid color-mix(in srgb,var(--primary) 45%,transparent);outline-offset:3px}body.modal-open .back-to-top-btn{pointer-events:none;z-index:1025}@media (max-width:575px){.back-to-top-btn{left:max(14px,env(safe-area-inset-left,0px));bottom:calc(max(14px,env(safe-area-inset-bottom,0px)) + var(--cbs-dock-h,0px));width:56px;height:56px}.back-to-top-btn__icon{width:1.55rem;height:1.55rem}}@media (prefers-reduced-motion:reduce){.back-to-top-btn{transition-duration:0.01ms}.back-to-top-btn.is-visible:hover{transform:none}}