.lfbn-bar {
    position: fixed;
    left: 16px;
    right: 16px;
    bottom: calc(16px + env(safe-area-inset-bottom));
    z-index: 99999;
    display: flex;
    justify-content: center;
    pointer-events: none;
    direction: rtl;
}
.lfbn-button {
    pointer-events: auto;
    width: min(100%, 520px);
    min-height: 54px;
    border: 0;
    border-radius: 14px;
    padding: 0 24px;
    font-size: 17px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 8px 28px rgba(0,0,0,.20);
    background: #111827;
    color: #fff;
    transition: transform .15s ease, opacity .15s ease;
}
.lfbn-button:hover { transform: translateY(-1px); }
.lfbn-button:disabled { opacity: .65; cursor: wait; }
.lfbn-icon { margin-left: 8px; }
@media (min-width: 769px) {
    .lfbn-bar { left: auto; right: 24px; bottom: 24px; }
    .lfbn-button { width: 300px; }
}