#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #F9F9F9;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.8s ease-in-out;
}

#loader-logo {
    width: 200px;
    opacity: 0;
    animation: fadeInOut 1.5s infinite alternate;
}

@keyframes fadeInOut {
    0% { opacity: 0.1; }
    100% { opacity: 1; }
}

.hidden {
    opacity: 0;
    pointer-events: none;
}