/* "Back to top" with the reading progress (Meden\ScrollTop) – works in any theme; colours via the custom properties */
.meden-scroll-top {
    --meden-scroll-top-color: var(--color-primary, #123d8a);
    --meden-scroll-top-bg: #fff;
    --meden-scroll-top-offset: 15px;

    position: fixed;
    right: var(--meden-scroll-top-offset);
    bottom: var(--meden-scroll-top-offset);
    z-index: 999;
    display: grid;
    place-items: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    box-shadow: 0 10px 30px rgba(11, 30, 68, .1);
    color: var(--meden-scroll-top-color);
    text-decoration: none;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity .3s, visibility .3s, transform .3s, box-shadow .3s;
}

/* the background stays under the ring (3px in, its edge in the middle of the ring's line): with the edges close
   together, the light rim of the background showed around the ring on dark footers (also with display scaling) */
.meden-scroll-top::before {
    content: "";
    position: absolute;
    inset: 3px;
    border-radius: 50%;
    background: var(--meden-scroll-top-bg);
}

.meden-scroll-top.is-visible {
    opacity: 1;
    visibility: visible;
    transform: none;
}

.meden-scroll-top:hover,
.meden-scroll-top:focus-visible {
    box-shadow: 0 18px 40px rgba(11, 30, 68, .16);
}

.meden-scroll-top:focus-visible {
    outline: 2px solid var(--meden-scroll-top-color);
    outline-offset: 3px;
}

.meden-scroll-top__ring {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    overflow: visible;
}

.meden-scroll-top__ring circle {
    fill: none;
    stroke-width: 2.5;
    stroke-linecap: butt; /* round caps would lap over the track */
}

.meden-scroll-top__track {
    /* opaque: a see-through track would show the dark background through it */
    stroke: color-mix(in srgb, var(--meden-scroll-top-color) 16%, #fff);
}

.meden-scroll-top__bar {
    stroke: currentColor;
}

/* the percentage and the arrow share the middle: the percentage only while scrolling, else the arrow */
.meden-scroll-top__percent,
.meden-scroll-top__arrow {
    position: relative; /* above the background (::before) */
    grid-area: 1 / 1;
    transition: opacity .2s ease, transform .3s ease;
}

.meden-scroll-top__percent {
    font-size: 11px;
    font-weight: 700;
    line-height: 1;
    font-variant-numeric: tabular-nums;
    letter-spacing: -.02em;
    opacity: 0;
}

.meden-scroll-top__arrow {
    width: 20px;
    height: 20px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.meden-scroll-top.is-scrolling .meden-scroll-top__percent {
    opacity: 1;
}

.meden-scroll-top.is-scrolling .meden-scroll-top__arrow {
    opacity: 0;
    transform: translateY(4px);
}

.meden-scroll-top:hover .meden-scroll-top__arrow {
    transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
    .meden-scroll-top,
    .meden-scroll-top__percent,
    .meden-scroll-top__arrow {
        transition: none;
    }
}

@media print {
    .meden-scroll-top { display: none; }
}