/* Opt-in source structure. Canonical text and normal passage styles are intact. */
.passage-content > .passage-item:has(+ .source-interstitial) {
    border-bottom-color: transparent;
}
.source-interstitial {
    margin: 1.8rem 0;
    padding: 0.9rem 0;
    border-top: 1px solid var(--border-color, #30363d);
    border-bottom: 1px solid var(--border-color, #30363d);
    color: var(--text-secondary, #8b949e);
    text-align: center;
    font-size: 0.94em;
    font-weight: 400;
    line-height: 1.65;
}
.source-body { white-space: normal; }
.source-body .source-paragraph + .source-paragraph { margin-top: 1em; }
.source-body .source-paragraph:empty { display: none; }
.source-enumeration {
    list-style: none;
    margin: 1em 0;
    padding: 0 0 0 1.8em;
}
.source-enumeration > li { padding-left: 0.2em; text-indent: -1.8em; }
.source-enumeration > li + li { margin-top: 0.35em; }
.source-small-caps,
.source-spaced-caps {
    font-variant-caps: normal;
    text-transform: uppercase;
    letter-spacing: normal;
}
.source-letter-spaced { letter-spacing: 0.14em; }
.source-group > .source-body + .source-body { margin-top: 1em; }