.back-to-top{z-index:1500;color:#fff;cursor:pointer;opacity:0;visibility:hidden;background:linear-gradient(135deg,#ff4fa3,#8a4fff);border:1px solid #ffffff59;border-radius:50%;justify-content:center;align-items:center;width:52px;height:52px;font-size:1rem;transition:opacity .3s,visibility .3s,transform .3s,box-shadow .3s;display:flex;position:fixed;bottom:28px;right:28px;transform:translateY(18px)scale(.85);box-shadow:0 10px 28px #4b285f47,0 0 18px #ff4fa33d}.back-to-top.visible{opacity:1;visibility:visible;transform:translateY(0)scale(1)}.back-to-top:hover{transform:translateY(-4px)scale(1.05);box-shadow:0 16px 34px #4b285f59,0 0 24px #ff4fa366}.back-to-top:active{transform:translateY(-1px)scale(.92)}.back-to-top:focus-visible{outline-offset:4px;outline:3px solid #18a7aa73}@media (width<=700px){.back-to-top{width:46px;height:46px;bottom:18px;right:18px}}@media (prefers-reduced-motion:reduce){.back-to-top{transition:none}.back-to-top:hover,.back-to-top:active{transform:none}}*{box-sizing:border-box}body{background:#fff;margin:0;padding:0;font-family:Arial,sans-serif;overflow-x:hidden}#root{width:100%;max-width:100%;min-height:100vh;overflow-x:hidden}