.scroll-top-btn{z-index:50;color:#e7e8e1;cursor:pointer;opacity:0;pointer-events:none;background:#222f30;border:1px solid #e7e8e133;border-radius:50%;justify-content:center;align-items:center;width:44px;height:44px;transition:opacity .25s,transform .25s,background .2s;display:inline-flex;position:fixed;bottom:clamp(16px,3vw,32px);right:clamp(16px,3vw,32px);transform:translateY(12px);box-shadow:0 6px 24px #00000040}.scroll-top-btn.is-visible{opacity:1;pointer-events:auto;transform:translateY(0)}.scroll-top-btn:hover{background:#2b3c3d}.scroll-top-btn:focus-visible{outline:2px solid var(--accent-amber);outline-offset:2px}@media (prefers-reduced-motion:reduce){.scroll-top-btn{transition:opacity .2s;transform:none}}