.back-top{position:fixed;right:20px;bottom:120px;z-index:1000;cursor:pointer;opacity:.8;transition:all .3s ease}.back-top:hover{opacity:1;transform:translateY(-2px)}.back-top-content{width:45px;height:45px;background:#007bff;border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 8px rgba(0,123,255,.3);transition:all .3s ease}.back-top:hover .back-top-content{background:#0056b3;box-shadow:0 4px 16px rgba(0,123,255,.4)}.back-top-icon{color:#fff;font-size:20px;font-weight:700;line-height:1}@media (max-width:768px){.back-top{right:15px;bottom:120px}.back-top-content{width:40px;height:40px}.back-top-icon{font-size:18px}}.back-top:focus{outline:none}.back-top:focus .back-top-content{box-shadow:0 0 0 3px rgba(0,123,255,.25)}.back-top{animation:fadeInUp .3s ease-out}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:.8;transform:translateY(0)}}