.scroll-to-top-btn{position:fixed;right:24px;bottom:24px;width:48px;height:48px;border:none;border-radius:50%;background:rgba(98,52,205,.92);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px rgba(98,52,205,.35);cursor:pointer;z-index:90;transition:opacity .2s ease,transform .2s ease}.scroll-to-top-btn:hover{transform:translateY(-2px)}.scroll-to-top-btn i{font-size:22px;line-height:1}@media (max-width:1200px){.scroll-to-top-btn{bottom:calc(88px + env(safe-area-inset-bottom));right:16px;width:44px;height:44px}}