/* The rail. Section marks live here and nowhere else — that is the whole
   job the runes have on this site now. */
.chapter-head {
    display: grid;
    grid-template-columns: var(--rail) minmax(0, 1fr);
    gap: 0 1.5rem;
    margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

/* The rune sits in a struck brass disc — enough presence to read as a section
   mark rather than a stray glyph. */
.chapter-mark {
    position: relative;
    justify-self: start;
    display: grid;
    place-items: center;
    width: 2.6rem;
    height: 2.6rem;
    margin-top: 0.15rem;
    /* The membrane is drawn, not bordered — see styles/sigil.css. */
    font-family: var(--font-rune);
    font-size: 1.15rem;
    line-height: 1;
    color: var(--copper-ink);
}

.chapter-mark::after {
    content: '';
    position: absolute;
    left: 50%;
    top: calc(100% + 0.7rem);
    width: 1px;
    height: 3rem;
    background: linear-gradient(var(--day-rule), transparent);
}

.chapter-lead {
    font-size: var(--step-1);
    line-height: 1.55;
    color: var(--day-ink-soft);
    /* The measure, like every other paragraph. This was 54ch, and the 62ch
       lift below it was scoped to a lead inside a HEAD — so a lead the markup
       puts in the body column instead (the room, business and souls chapters)
       matched neither rule, fell to 54ch inside a 61ch column, and widowed its
       own last line while the prose beneath it ran on. One measure. */
    max-width: var(--measure);
    margin-top: 1rem;
    margin-bottom: 0;
}


/* One right edge for the text column.
   Measured at 1440px: chapter headings ran to 1310 while the prose beneath them
   stopped at 790, so every section read as a wide title stepping down onto a
   narrow column with ~650px of empty parchment beside it. The prose measure is
   correct (64-75 characters) and must not be widened to close that gap, so the
   headings come in to meet it instead. The margin then reads as an intentional
   editorial margin rather than as a column that ran out. */
/* h1 as well as h2: /#scenes is the site's one page-level chapter heading and
   it was exempt by element name, so its title ran the full 985px while the
   lead beneath it stopped at 925 — the exact overhang this rule exists to
   close, in the one place the rule did not reach. */
.chapter-head h1,
.chapter-head h2 {
    max-width: 22ch;
}

/* The lead is prose and keeps the prose measure. It was in the rule above,
   with a 62ch override immediately after; the override went out with the
   62ch-to-measure pass and left every chapter lead capped at 22ch — about
   230px, four words a line, beside a thousand pixels of empty ground. It was
   the turn's own opening paragraph, which is the best writing on the page. */
.chapter-head .chapter-lead {
    max-width: var(--measure);
}


@media (min-width: 1100px) {
    .chapter-head h1,
    .chapter-head h2 {
        max-width: 30ch;
    }
}