.back-to-top{position:fixed;right:24px;bottom:24px;z-index:60;display:inline-flex;width:42px;height:42px;align-items:center;justify-content:center;border:1px solid #e6c778;border-radius:999px;background:linear-gradient(145deg,#efd181,#c99e4c);color:#11191a;font:700 20px/1 system-ui,sans-serif;box-shadow:inset 0 1px #fff9,0 10px 28px #0004;cursor:pointer;opacity:0;pointer-events:none;transform:translateY(10px);transition:opacity .2s ease,transform .2s ease,filter .2s ease}
.back-to-top.is-visible{opacity:1;pointer-events:auto;transform:translateY(0)}
.back-to-top:hover{filter:brightness(1.08)}
.back-to-top:focus-visible{outline:3px solid #edca7f;outline-offset:4px}
.back-to-top span{display:block;transform:translateY(-1px)}
@media(max-width:780px){.back-to-top{right:16px;bottom:16px;width:40px;height:40px;font-size:19px}}
@media(prefers-reduced-motion:reduce){.back-to-top{transition:none}}