#drea-btt{position:fixed;z-index:9999;width:44px;height:44px;border:none;border-radius:50%;cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.2);display:flex;align-items:center;justify-content:center;opacity:0;transform:scale(.5);transition:opacity .3s,transform .3s;pointer-events:none;}
#drea-btt.is-visible{opacity:1;transform:scale(1);pointer-events:auto;}
#drea-btt:hover{opacity:.85;}
#drea-btt svg{width:22px;height:22px;}
/* 位置变体 */
#drea-btt[data-position="right-bottom"]{right:24px;bottom:24px;}
#drea-btt[data-position="left-bottom"]{left:24px;bottom:24px;}
#drea-btt[data-position="right-top"]{right:24px;top:24px;}
#drea-btt[data-position="left-top"]{left:24px;top:24px;}