.ir-back-to-top{position:fixed;right:42px;bottom:34px;width:58px;height:58px;border:none;border-radius:999px;display:flex;align-items:center;justify-content:center;background:linear-gradient(180deg,#1A2750 0%,#10172A 100%);color:#fff;cursor:pointer;z-index:999999;opacity:0;visibility:hidden;transform:translateY(18px) scale(.92);transition:opacity .25s ease,transform .25s ease,background .25s ease,box-shadow .25s ease;box-shadow:0 8px 24px rgb(0 0 0 / .28),0 0 0 1px rgb(255 255 255 / .06),0 0 18px rgb(33 92 255 / .18)}.ir-back-to-top:hover{transform:translateY(-4px) scale(1.04);background:linear-gradient(180deg,#223A74 0%,#152142 100%);box-shadow:0 14px 34px rgb(0 0 0 / .35),0 0 0 1px rgb(255 255 255 / .08),0 0 28px rgb(59 130 246 / .28)}.ir-back-to-top.show{opacity:1;visibility:visible;transform:translateY(0) scale(1)}.ir-back-to-top::before{content:"↑";color:#fff!important;font-size:30px;font-weight:700;line-height:1;transform:translateY(-2px);display:block}@media (max-width:1024px){.ir-back-to-top{display:none!important}}