.sb-busy-overlay {
    position: fixed;
    inset: 0;
    z-index: 2147483647;
    display: grid;
    place-items: center;
    padding: 20px;
    background: rgba(9, 28, 51, .42);
    cursor: progress;
}
.sb-busy-overlay[hidden] { display: none; }
.sb-busy-card {
    width: min(100%, 340px);
    box-sizing: border-box;
    padding: 22px;
    border-radius: 20px;
    background: #fff;
    color: #10243e;
    text-align: center;
    box-shadow: 0 20px 70px rgba(0, 0, 0, .25);
    font: 16px/1.5 system-ui, sans-serif;
}
.sb-busy-card strong { display: block; }
.sb-busy-card p { margin: 12px 0 0; }
.sb-busy-spinner {
    display: inline-block;
    width: 54px;
    height: 54px;
    padding: 5px;
    margin-bottom: 12px;
    border: 4px solid #dce8f7;
    border-top-color: #0b4f93;
    border-radius: 50%;
    animation: sb-busy-spin 1.8s linear infinite;
}
.sb-busy-logo { width: 100%; height: 100%; object-fit: contain; border-radius: 50%; }
.sb-busy-overlay.is-read { background: transparent; pointer-events: none; }
.sb-busy-overlay.is-read .sb-busy-card { border: 1px solid #dce8f7; }
@keyframes sb-busy-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .sb-busy-spinner { animation: none; } }
@media print { .sb-busy-overlay { display: none; } }