.scroll-to-top{position:fixed;bottom:var(--space-20);right:var(--space-6);z-index:var(--z-fixed);width:44px;height:44px;border-radius:var(--radius-circle);border:1px solid var(--border-subtle);background:var(--bg-elevated);background:var(--bg-glass);box-shadow:var(--glow-cyan);cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transform:translateY(12px);transition:opacity var(--transition-normal),visibility var(--transition-normal),transform var(--transition-normal),box-shadow var(--transition-normal),background-color var(--transition-normal)}.scroll-to-top[data-visible=true]{opacity:1;visibility:visible;transform:translateY(0)}.scroll-to-top:hover{background:var(--bg-glass-hover);box-shadow:var(--glow-cyan-strong)}.scroll-to-top:active{background:var(--bg-glass-active);transform:translateY(-1px)}.scroll-to-top svg{width:20px;height:20px;color:var(--brand-cyan)}@media (max-width:768px){.scroll-to-top{bottom:calc(72px + env(safe-area-inset-bottom, 0px));right:var(--space-4);width:40px;height:40px}.scroll-to-top svg{width:18px;height:18px}}