#btn-ir-arriba,.scroll-to-top{position:fixed;bottom:32px;right:32px;width:56px;height:56px;background:linear-gradient(135deg,#fdd835,#fbc02d);border:none;border-radius:50%;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(20px) scale(.8);transition:all .3s ease;box-shadow:0 6px 20px rgba(253,216,53,.4);z-index:1000;display:flex;align-items:center;justify-content:center}.scroll-to-top.visible{opacity:1;visibility:visible;transform:translateY(0) scale(1)}.scroll-to-top:hover{background:linear-gradient(135deg,#fbc02d,#f9a825);transform:translateY(-4px) scale(1.05);box-shadow:0 8px 24px rgba(253,216,53,.6)}.scroll-to-top .flecha-arriba svg{width:28px;height:28px;color:#1e3a5f}.scroll-to-top .flecha-arriba svg path{stroke-width:3}@media(max-width:600px){.scroll-to-top{bottom:20px;right:20px;width:48px;height:48px}.scroll-to-top .flecha-arriba svg{width:24px;height:24px}}