.addon-rail{
    position:fixed;
    right:0;
    top:50%;
    transform:translateY(-50%);
    z-index:9999;
    display:flex;
    flex-direction:column;
}

.addon-tab {
    width: 22px;
    height: 100px;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.3px;
    color: #ffffff;
    text-decoration: none;
    border-top-right-radius: 8px;
    border-bottom-right-radius: 8px;
    cursor: pointer;
    user-select: none;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.addon-tab:hover {
    transform: rotate(180deg) translateX(-2px);
}

.contact  { background:#6f5bd4; }
.whatsapp { background:#25d366; }
.call     { background:#128c7e; }

.addon-panel{
    position:fixed;
    top:0;
    right:-360px;
    width:360px;
    max-width:100vw;
    height:100%;
    background:#fff;
    z-index:10000;
    transition:right .35s ease;
    box-shadow:-6px 0 20px rgba(0,0,0,.2);
}

.addon-panel.open{ right:0; }

@media (max-width: 768px){
    .addon-panel{
        width:92vw;
        right:-92vw;
    }
}

.panel-header{
    display:flex;
    justify-content:space-between;
    padding:16px;
    font-weight:600;
    border-bottom:1px solid #eee;
}

.panel-close{
    cursor:pointer;
    font-size:22px;
}

.panel-body{
    padding:16px;
    overflow-y:auto;
    max-height:calc(100vh - 60px);
}