.contact-support-btn {
    position: fixed;
    right: 20px;
    bottom: 20px;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 54px;
    height: 54px;
    border-radius: 50%;
    background: linear-gradient(135deg, #229ed9 0%, #1a8bc7 100%);
    color: #fff;
    box-shadow: 0 4px 18px rgba(34, 158, 217, 0.45);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.15s ease, box-shadow 0.2s ease;
    -webkit-tap-highlight-color: transparent;
    cursor: pointer;
}

.contact-support-btn:hover {
    filter: brightness(1.08);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 24px rgba(34, 158, 217, 0.55);
    color: #fff;
}

.contact-support-btn:active {
    transform: translateY(-1px) scale(0.96);
}

.contact-support-btn svg {
    width: 26px;
    height: 26px;
    flex-shrink: 0;
    fill: currentColor;
    margin-right: 2px; /* optical alignment shift */
}

@media (max-width: 600px) {
    .contact-support-btn {
        width: 48px;
        height: 48px;
        right: 16px;
        bottom: 16px;
    }
    
    .contact-support-btn svg {
        width: 22px;
        height: 22px;
    }
}