.back-to-top{position:fixed;bottom:30px;right:30px;border-radius:50%;cursor:pointer;height:60px;width:60px;border:none;background:linear-gradient(45deg,rgba(0,0,0,.85),rgba(0,147,101,.15));display:flex;justify-content:center;align-items:center;box-shadow:0 4px 6px rgba(0,0,0,.2);transform:translateX(100px);opacity:0;transition:transform .3s ease,opacity .3s ease;z-index:1000}.back-to-top svg{font-size:28px;color:#16a085}.back-to-top:hover{background:linear-gradient(45deg,rgba(0,147,101,.15),rgba(0,0,0,.85));box-shadow:0 6px 10px rgba(0,0,0,.3)}.back-to-top.visible{transform:translateX(0);opacity:1}.mouse-tracker{width:10px;height:10px;background-color:#fff;border-radius:50%;position:fixed;pointer-events:none;z-index:9999;transform:translate(-50%,-50%)}