.app-loading-mask {
    position: fixed;
    inset: 0;
    z-index: 10050;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(15, 23, 42, 0.38);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.15s ease, visibility 0.15s ease;
}

.app-loading-mask.is-visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.app-loading-spinner {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.35);
    border-top-color: #fff;
    animation: app-loading-spin 0.75s linear infinite;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.18);
}

.app-loading-spinner .sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

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