#loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-page);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.5s ease, visibility 0.5s;
}

#loader-overlay.fade-out {
    opacity: 0;
    visibility: hidden;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid var(--grid-lines);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 2rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loader-tip-box {
    background: var(--bg-card);
    color: var(--text-main);
    padding: 1rem 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    font-weight: 500;
    max-width: 320px;
    text-align: center;
    transition: all 0.3s;
}