.back-button{position:fixed;bottom:20px;right:20px;width:50px;height:50px;border-radius:50%;background-color:#0d3c46;color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px #00000026;transition:all .3s ease;z-index:1000}.back-button:hover{background-color:#f4681b;transform:scale(1.05);box-shadow:0 6px 16px #0003}.back-button.visible{opacity:1;transform:translateY(0);pointer-events:all}.back-button.hidden{opacity:0;transform:translateY(20px);pointer-events:none}