.page-navigation-overlay {
    position: fixed;
    inset: 0;
    z-index: 12000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    background: rgba(15, 23, 42, 0.76);
    backdrop-filter: blur(5px) saturate(120%);
    -webkit-backdrop-filter: blur(5px) saturate(120%);
    transition: opacity 180ms cubic-bezier(0.16, 1, 0.3, 1),
        visibility 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

.page-navigation-overlay.is-visible {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
}

.page-navigation-dialog {
    display: flex;
    align-items: center;
    gap: 14px;
    width: min(100%, 320px);
    padding: 18px 20px;
    border: 1px solid rgba(148, 163, 184, 0.34);
    border-radius: 14px;
    background: #ffffff;
    color: #0f172a;
    box-shadow: 0 24px 64px rgba(15, 23, 42, 0.32);
}

.page-navigation-spinner {
    flex: 0 0 28px;
    width: 28px;
    height: 28px;
    border: 3px solid #cbd5e1;
    border-top-color: #1d4ed8;
    border-radius: 50%;
    animation: page-navigation-spin 720ms linear infinite;
}

.page-navigation-copy {
    display: grid;
    gap: 2px;
    min-width: 0;
}

.page-navigation-copy strong {
    font-size: 15px;
    font-weight: 750;
    line-height: 1.35;
}

.page-navigation-copy small {
    color: #475569;
    font-size: 13px;
    line-height: 1.35;
}

.page-navigation-trigger {
    opacity: 0.72 !important;
    transform: scale(0.985) !important;
    pointer-events: none !important;
    transition: opacity 160ms cubic-bezier(0.16, 1, 0.3, 1),
        transform 160ms cubic-bezier(0.16, 1, 0.3, 1) !important;
}

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

@media (max-width: 480px) {
    .page-navigation-overlay { padding: 16px; }
    .page-navigation-dialog { width: min(100%, 288px); }
}

@media (prefers-reduced-motion: reduce) {
    .page-navigation-overlay,
    .page-navigation-trigger { transition: none !important; }
    .page-navigation-spinner { animation: none; }
}