#lc-btn{position:fixed;bottom:20px;right:20px;width:56px;height:56px;border-radius:50%;background:#2563eb;color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer}
#lc-box{position:fixed;bottom:90px;right:20px;width:320px;height:420px;background:#0b1220;border-radius:14px;display:none;flex-direction:column}
#lc-box.open{display:flex}
#lc-body{flex:1;overflow:auto;padding:10px}
.msg{margin:6px 0}
.admin{color:#22c55e}
.visitor{color:#fff}
#lc-input{display:flex}
#lc-input input{flex:1}