.scroll-to-top{position:fixed;bottom:2rem;right:2rem;z-index:9999;pointer-events:auto}.scroll-to-top button{background-color:var(--button-accent-bg, #667eea);color:var(--button-accent-text, #ffffff);border:1px solid var(--card-border-color, #30363d);border-radius:50%;width:50px;height:50px;font-size:24px;line-height:48px;padding:0;cursor:pointer;opacity:.85;transition:opacity .3s ease-in-out,transform .3s ease-in-out;box-shadow:0 4px 12px #0000004d}.scroll-to-top button:hover,.scroll-to-top button:active{opacity:1;transform:scale(1.1);background-color:var(--button-accent-hover-bg, #5468d4)}@media (max-width: 768px){.scroll-to-top{bottom:calc(16px + env(safe-area-inset-bottom,0px));right:16px;z-index:9999}.scroll-to-top button{width:44px;height:44px;font-size:20px;line-height:42px;opacity:.9;box-shadow:0 4px 14px #00000080}}