.back-to-top{position:fixed;right:max(20px,env(safe-area-inset-right,0px));bottom:max(var(--back-top-bottom,18px),calc(14px + env(safe-area-inset-bottom,0px)));z-index:70;display:grid;place-items:center;width:44px;min-width:44px;height:44px;min-height:44px;margin:0;padding:11px;border:1px solid rgba(255,255,255,.18);border-radius:13px;background:#255e8a;color:#fff;box-shadow:0 5px 18px rgba(16,41,67,.2);cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent}
.back-to-top[hidden]{display:none!important}
.back-to-top svg{display:block;width:20px;height:20px;pointer-events:none}
.back-to-top:focus-visible{outline:3px solid var(--accent2,#9ac9ec);outline-offset:3px}
.modal-open .back-to-top{display:none!important}
@media(hover:hover){.back-to-top:hover{background:#1b4c74;border-color:rgba(255,255,255,.3)}}
@media(max-width:700px){.back-to-top{right:max(12px,env(safe-area-inset-right,0px));border-radius:12px;box-shadow:0 4px 15px rgba(16,41,67,.18)}}
@media(prefers-reduced-motion:reduce){.back-to-top{animation:none;transition:none;scroll-behavior:auto}}