.kf-back-top{position:fixed;right:24px;bottom:max(24px,env(safe-area-inset-bottom));z-index:90;display:flex;align-items:center;justify-content:center;gap:9px;min-width:52px;min-height:52px;padding:12px 17px;border:1px solid #c1e4dd;border-radius:16px;background:#123c3b;color:#fff;box-shadow:0 6px 26px #10383625;font-family:inherit;font-size:13px;font-weight:600;line-height:1.3;cursor:pointer;transition:background .2s,transform .2s}.kf-back-top[hidden]{display:none}.kf-back-top:hover{background:#087f78;transform:translateY(-3px)}.kf-back-top svg{width:22px;height:22px}.kf-back-top:focus-visible{outline:3px solid #11a994;outline-offset:4px}body:has(.kf-welcome:not([hidden])) .kf-back-top{visibility:hidden}#kf-page-top:focus{outline:none}.kf-category-bar a.kf-calculation-nav{display:flex;align-items:center;gap:8px}.kf-calculation-nav svg{width:16px;height:16px;flex:none}@media(max-width:600px){.kf-back-top{right:16px;bottom:max(16px,env(safe-area-inset-bottom));padding:12px;border-radius:14px}.kf-back-top span{display:none}}@media(prefers-reduced-motion:reduce){.kf-back-top{transition:none}}