.scroll-to-top{position:fixed;bottom:40px;right:40px;width:48px;height:48px;border-radius:50%;background:#3b82f6;border:0;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px rgba(59,130,246,.4);opacity:0;visibility:hidden;transform:translateY(10px);transition:all .3s ease;z-index:1000}.scroll-to-top.show{opacity:1;visibility:visible;transform:translateY(0)}.scroll-to-top:hover{background:#2563eb;box-shadow:0 6px 16px rgba(37,99,235,.5);transform:translateY(-2px)}.scroll-to-top:active{transform:translateY(0);box-shadow:0 2px 8px rgba(59,130,246,.3)}.scroll-to-top svg{width:24px;height:24px;color:#fff}@media screen and (max-width:768px){.scroll-to-top{bottom:24px;right:24px;width:44px;height:44px}.scroll-to-top svg{width:20px;height:20px}}@media screen and (max-width:480px){.scroll-to-top{bottom:16px;right:16px;width:40px;height:40px}.scroll-to-top svg{width:18px;height:18px}}