/* Container cho các nút chat */
.chat-buttons {
    position: fixed;
    bottom: 40px;
    right: 30px;
    z-index: 1000;
    display: flex;
    -webkit-flex-direction: column;
    flex-direction: column;
    gap: 12px;
}

/* Style chung cho các nút */
.chat-btn {
    width: 40px;
    height: 40px;
    -webkit-border-radius: 50%;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.chat-btn > svg {
    width: 24px;
    height: 24px;
}

.chat-btn:hover {
    transform: translateY(-3px) scale(1.1);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

/* Nút Zalo */
.zalo-btn {
    background: linear-gradient(135deg, #0068ff, #0052cc);
}

.zalo-btn:hover {
    background: linear-gradient(135deg, #0052cc, #003d99);
}

/* Nút Messenger */
.messenger-btn {
    background: linear-gradient(135deg, #00c6ff, #0072ff);
}

.messenger-btn:hover {
    background: linear-gradient(135deg, #0072ff, #005ce6);
}

/* Icon styles */
.chat-btn svg {
fill: white;
}

/* Hiệu ứng pulse */
.chat-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.6s ease;
}

.chat-btn:hover::before {
    width: 100%;
    height: 100%;
}

/* Tooltip */
.chat-btn .tooltip {
    position: absolute;
    right: 70px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 14px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.chat-btn .tooltip::after {
    content: '';
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    border: 5px solid transparent;
    border-left-color: rgba(0, 0, 0, 0.8);
}

.chat-btn:hover .tooltip {
    opacity: 1;
    visibility: visible;
}

/* Responsive */
@media (max-width: 768px) {
    .chat-buttons {
    right: 10px;
    }
    .chat-btn {
    width: 44px;
    height: 44px;
    }
    
    .tooltip {
        display: none; /* Ẩn tooltip trên mobile */
    }

    #backToTop {
    right: 10px !important;
    }
}