/* A fixed page-position ruler that stays inside the landing page's edge gutter. */
.scroll-ruler {
    position: fixed;
    top: 112px;
    bottom: max(28px, env(safe-area-inset-bottom), var(--ruler-footer-clearance, 0px));
    right: max(6px, env(safe-area-inset-right));
    width: 32px;
    z-index: 100;
    color: var(--theme-accent);
    pointer-events: none;
    user-select: none;
    contain: layout style;
}

.scroll-ruler[hidden],
.landing-loading .scroll-ruler,
.landing-page:has(.navbar-toggle.open) .scroll-ruler {
    display: none;
}

.scroll-ruler__scale {
    position: absolute;
    inset: 0;
    border-right: 1px solid currentColor;
    opacity: .35;
}

.scroll-ruler__tick {
    position: absolute;
    top: calc(var(--tick) * 1%);
    right: 0;
    width: 4px;
    height: 1px;
    background: currentColor;
}

/* The current section sits in the edge gutter, independent of the page copy. */
.scroll-ruler__index {
    position: absolute;
    top: 0;
    right: 42px;
    writing-mode: vertical-rl;
    white-space: nowrap;
    font: 10px/1 var(--font-mono);
    letter-spacing: .1em;
    text-transform: uppercase;
}
.scroll-ruler__number { font-weight: 700; }

.scroll-ruler__tick--major { width: 10px; }
.scroll-ruler__tick--labelled { width: 14px; }
.scroll-ruler__tick span {
    position: absolute;
    right: 18px;
    top: 0;
    transform: translateY(-50%);
    font: 9px/1 var(--font-mono);
    font-variant-numeric: tabular-nums;
}

.scroll-ruler__position {
    position: absolute;
    top: calc(var(--scroll-progress, 0) * 100%);
    right: 0;
    width: 22px;
    height: 2px;
    transform: translateY(-50%);
    background: currentColor;
}

.scroll-ruler__position::before {
    content: '';
    position: absolute;
    left: -2px;
    top: -2px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
}

@media (max-width: 1199px) {
    .scroll-ruler {
        top: 96px;
        right: max(2px, env(safe-area-inset-right));
        width: 12px;
    }
    .scroll-ruler__tick span { display: none; }
    .scroll-ruler__index { top: -20px; right: 0; writing-mode: horizontal-tb; font-size: 9px; }
    .scroll-ruler__name { display: none; }
    .scroll-ruler__tick--labelled { width: 10px; }
    .scroll-ruler__position { width: 10px; }
    .scroll-ruler__position::before { width: 4px; height: 4px; top: -1px; }
}