.logo_loading {
    position: relative;
    min-height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.8);
}
.logo_loading::before {
    content: '';
    width: 40px;
    height: 40px;
    border: 4px solid #ccc;
    border-top: 4px solid #0073aa;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}