.online_Nav {
    position: fixed !important;
    right: 0 !important;
    left: auto !important;
    bottom: auto !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    width: 22px;
    height: 88px;
    padding: 0 !important;
    margin: 0 !important;
    z-index: 9999 !important;
    overflow: visible;
}

.online_Nav .cs-side-tab {
    display: flex !important;
    align-items: center;
    justify-content: center;
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 22px;
    min-height: 72px;
    padding: 14px 0;
    background: #2563eb;
    color: #fff;
    font-size: 12px;
    line-height: 1.15;
    letter-spacing: 2px;
    writing-mode: vertical-rl;
    border-radius: 8px 0 0 8px;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    cursor: pointer;
    z-index: 4;
    opacity: 1;
    pointer-events: auto;
    transition: opacity 0.2s ease;
}

.online_Nav .cs-side-inner {
    position: absolute;
    right: 10px;
    top: 50%;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    transform: translate(120%, -50%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.28s ease, opacity 0.2s ease, visibility 0.2s ease;
}

.online_Nav:hover,
.online_Nav.is-open {
    width: 90px;
    height: 320px;
}

.online_Nav:hover .cs-side-inner,
.online_Nav.is-open .cs-side-inner {
    transform: translate(0, -50%);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.online_Nav:hover .cs-side-tab,
.online_Nav.is-open .cs-side-tab {
    opacity: 0;
    pointer-events: none;
}