.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    visibility: hidden;
    opacity: 0;
    transition: visibility 0s, opacity 0.3s;
}

.loading-overlay.show {
    visibility: visible;
    opacity: 1;
}

.loading-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.loading-spinner {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: 6px solid #f3f3f3;
    border-top: 6px solid #003366;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

.loading-message {
    color: white;
    font-weight: bold;
    margin-top: 20px;
    text-align: center;
    width: 100%;
}

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