.chat-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    background: #25d366;
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    padding: 12px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border: none;
    cursor: pointer;
    outline: none;
}
.chat-btn:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,0.25);
    transform: scale(1.1);
    background: #128c7e;
}
.chat-btn svg {
    width: 32px;
    height: 32px;
    fill: #fff;
}