/* Shared article chrome — an always-visible, top-edge reading indicator. */
.vb-scroll-progress {
    --vb-progress-start: #f4f1e8;
    --vb-progress-mid: var(--vb-progress-start);
    --vb-progress-end: #f4f1e8;
    position: fixed;
    inset: 0 0 auto;
    z-index: 2147483647;
    height: 5px;
    overflow: hidden;
    pointer-events: none;
    background: rgba(255, 255, 255, .2);
    box-shadow: 0 1px 10px rgba(0, 0, 0, .26);
}

.vb-scroll-progress > i {
    display: block;
    width: 100%;
    height: 100%;
    transform: scaleX(0);
    transform-origin: left center;
    will-change: transform;
    background: linear-gradient(90deg, var(--vb-progress-start), var(--vb-progress-mid), var(--vb-progress-end));
    box-shadow: 0 0 16px var(--vb-progress-end);
}

@media (prefers-reduced-motion: reduce) {
    .vb-scroll-progress > i { will-change: auto; }
}