.sb-back-to-top {
 position: fixed; right: max(24px, env(safe-area-inset-right)); bottom: calc(24px + env(safe-area-inset-bottom));
 z-index: 80; display: grid; place-items: center; width: 48px; height: 48px;
 padding: 0; border: 1px solid #a58adf; border-radius: 50%; background: #111014; color: #fff;
 box-shadow: 0 4px 18px #21103530; cursor: pointer;
 transition: transform .2s ease, background .2s ease;
}
.sb-back-to-top[hidden] { display: none; }
.sb-back-to-top svg { width: 23px; height: 23px; }
.sb-back-to-top:hover { transform: translateY(-3px); background: #392064; }
.sb-back-to-top:focus-visible { outline: 3px solid #7954d8; outline-offset: 4px; }
@media (max-width: 600px) { .sb-back-to-top { right: max(16px, env(safe-area-inset-right)); bottom: calc(16px + env(safe-area-inset-bottom)); } }
@media (prefers-reduced-motion: reduce) { .sb-back-to-top { transition: none; } }
@media print { .sb-back-to-top { display: none !important; } }