.buybook-loading {
    display: flex;
    position: fixed;
    inset: 0;
    z-index: 99999;
    background: rgba(255, 255, 255, .8);
    align-items: center;
    justify-content: center;
}
.buybook-loading[hidden] { display: none !important; }
.buybook-loading-box {
    text-align: center;
    padding: 24px 32px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 14px rgba(0, 0, 0, .18);
    color: #47759b;
    font-size: 16px;
    max-width: calc(100% - 24px);
}
.buybook-loading-spinner {
    display: block;
    width: 34px;
    height: 34px;
    margin: 0 auto 12px;
    border: 4px solid #dceaf3;
    border-top-color: #47759b;
    border-radius: 50%;
    animation: buybook-spin .8s linear infinite;
}
@keyframes buybook-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .buybook-loading-spinner { animation: none; } }