.fcbvn-wrap {
    position: fixed;
    z-index: 999999;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transform: translateY(-50%);
}

.fcbvn-button {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    border: 2px solid rgba(255,255,255,.9);
    border-radius: 50%;
    color: #fff;
    text-decoration: none !important;
    box-shadow: 0 5px 16px rgba(0,0,0,.22);
    transition: transform .2s ease, box-shadow .2s ease;
}

.fcbvn-button:hover,
.fcbvn-button:focus {
    color: #fff;
    transform: scale(1.08);
    box-shadow: 0 7px 22px rgba(0,0,0,.3);
    outline: none;
}

.fcbvn-icon,
.fcbvn-icon svg {
    display: block;
}

.fcbvn-icon svg {
    fill: currentColor;
}

.fcbvn-phone { background: #20b857; }
.fcbvn-zalo { background: #0877d1; }
.fcbvn-facebook { background: #1877f2; }
.fcbvn-map { background: #ea4335; }

.fcbvn-zalo svg text {
    fill: #fff;
}

.fcbvn-tooltip {
    position: absolute;
    top: 50%;
    width: max-content;
    max-width: 180px;
    padding: 7px 10px;
    border-radius: 5px;
    background: rgba(25,25,25,.92);
    color: #fff;
    font-size: 13px;
    line-height: 1.2;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-50%);
    transition: opacity .15s ease;
}

.fcbvn-right .fcbvn-tooltip {
    right: calc(100% + 10px);
}

.fcbvn-left .fcbvn-tooltip {
    left: calc(100% + 10px);
}

.fcbvn-has-tooltip .fcbvn-button:hover .fcbvn-tooltip,
.fcbvn-has-tooltip .fcbvn-button:focus .fcbvn-tooltip {
    opacity: 1;
    visibility: visible;
}

@media (min-width: 783px) {
    .fcbvn-hide-desktop { display: none !important; }
}

@media (max-width: 782px) {
    .fcbvn-hide-mobile { display: none !important; }
    .fcbvn-wrap { gap: 8px; }
    .fcbvn-tooltip { display: none; }
}