.scroll-to-top-btn{position:fixed;bottom:32px;right:32px;width:48px;height:48px;background:linear-gradient(135deg,#ef4444,#dc2626);border:2px solid hsla(0,0%,100%,.1);border-radius:14px;display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:9999;box-shadow:0 6px 20px rgba(239,68,68,.35);transition:all .3s cubic-bezier(.4,0,.2,1);backdrop-filter:blur(10px)}.scroll-to-top-btn:hover{box-shadow:0 8px 28px rgba(239,68,68,.5);border-color:hsla(0,0%,100%,.2);background:linear-gradient(135deg,#f87171,#ef4444)}.scroll-to-top-btn svg{color:#fff;transition:transform .3s ease}.scroll-to-top-btn:hover svg{transform:translateY(-2px)}@media (max-width:768px){.scroll-to-top-btn{bottom:20px;right:20px;width:44px;height:44px}.scroll-to-top-btn svg{width:18px;height:18px}}@media (max-width:480px){.scroll-to-top-btn{bottom:16px;right:16px;width:42px;height:42px}}