.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    z-index: 9999;
    background: #e3e4ee;
    pointer-events: none;
}

.reading-progress__fill {
    display: block;
    width: 100%;
    height: 100%;
    background: #232968;
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 80ms linear;
    will-change: transform;
}

@media (prefers-reduced-motion: reduce) {
    .reading-progress__fill {
        transition: none;
    }
}