.back-to-top{position:fixed;bottom:30px;right:30px;z-index:1001;width:50px;height:50px;border-radius:50%;background:var(--color-primary);color:var(--color-text-on-dark);border:0;font-size:1.5rem;font-weight:700;cursor:pointer;box-shadow:0 4px 12px rgba(255,87,34,.4);opacity:0;visibility:hidden;transform:translateY(100px);transition:opacity var(--transition-normal),visibility var(--transition-normal),transform var(--transition-normal),background-color var(--transition-normal),box-shadow var(--transition-normal)}.back-to-top.show{opacity:1;visibility:visible;transform:translateY(0)}.back-to-top:hover{background:var(--color-primary-dark);transform:translateY(-5px);box-shadow:0 6px 16px rgba(255,87,34,.6)}.back-to-top:active{transform:translateY(-2px)}@media (max-width:768px){.back-to-top{bottom:20px;right:20px;width:45px;height:45px;font-size:1.3rem}}@media (max-width:480px){.back-to-top{bottom:15px;right:15px;width:40px;height:40px;font-size:1.2rem}}