.scroll-to-top-btn{position:fixed;right:24px;bottom:32px;z-index:1000;background:var(--bs-primary,#0d6efd);color:#fff;border:none;border-radius:50%;width:50px;height:50px;box-shadow:0 2px 8px rgba(0,0,0,.15);opacity:0;pointer-events:none;transition:opacity .3s;display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer}.scroll-to-top-btn.show{opacity:1;pointer-events:auto}.scroll-to-top-btn:active{background:#0b5ed7}@media(max-width:600px){.scroll-to-top-btn{right:16px;bottom:16px;width:44px;height:44px;font-size:18px}}