/* Loading styles */
body.loading {
    visibility: hidden;
    opacity: 0;
    background: #000;
    position: relative;
}

body.loading::after {
    content: '';
    position: fixed;
    top: 50%;
    left: 50%;
    width: 50px;
    height: 50px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #3498db;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    animation: spin 1s linear infinite;
    visibility: visible;
}

body.loaded {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease-in;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Prevent FOUC (Flash of Unstyled Content) */
.no-js body.loading {
    visibility: visible;
    opacity: 1;
}