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    --bg-color: #e8e5de;
    --bg-paper: #f5f4ef;
    --accent-color: #1a6b7c;
    --accent-light: #e8f4f6;
    --accent-dark: #145566;
    --border-color: #d0cbc2;
    --border-dark: #b8b3aa;
}

.preprint-doc{
    background: var(--bg-color);
}

.preprint-doc{
    font-family: 'Source Serif 4', 'Georgia', 'Times New Roman', serif;
    font-size: 1.05rem;
    line-height: 1.75;
    color: var(--text-color);
    max-width: 52em;
    margin: 0 auto;
    padding: 2rem 2.5rem 4rem;
    background: var(--bg-paper);
}

@media (max-width: 768px) {
    .preprint-doc{ font-size: 0.95rem; padding: 1rem; }
}

/* Title block */
.preprint-doc div.maketitle{
    padding: 2rem 0 1.5rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.preprint-doc h2.titleHead{
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 1.7rem;
    font-weight: 600;
    color: var(--text-color);
    letter-spacing: -0.01em;
    line-height: 1.35;
}

.preprint-doc div.author{ color: var(--text-muted); font-size: 0.95rem; line-height: 1.6; }
.author-affiliation{ color: var(--text-light); font-style: italic; }
.preprint-doc a.author-email{ color: var(--accent-color); font-style: normal; }
.preprint-doc a.author-email:hover{ color: var(--accent-dark); }
.preprint-doc div.date{ color: var(--text-light); font-size: 0.85rem; margin-top: 0.3rem; }
.preprint-link{ margin-top: 0.5rem; font-size: 0.85rem; }
.preprint-link a{ color: var(--accent-color); border-bottom: 1px solid var(--border-color); padding-bottom: 1px; }
.preprint-link a:hover{ color: var(--accent-dark); border-bottom-color: var(--accent-dark); text-decoration: none; }

/* Abstract */
.abstract{
    background: var(--accent-light);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 1.2rem 1.5rem;
    margin: 1.5rem 0;
}
.abstracttitle{
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.85rem;
    color: var(--text-color);
}

/* Section headings */
.preprint-doc h3.sectionHead, .preprint-doc h3.likesectionHead{
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--text-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.35rem;
    margin-top: 2.5rem;
}

.preprint-doc h4.subsectionHead, .preprint-doc h4.likesubsectionHead{
    font-family: 'Source Serif 4', Georgia, serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-top: 1.8rem;
}

/* Links */
.preprint-doc a{ color: var(--accent-color); text-decoration: none; }
.preprint-doc a:hover{ color: var(--accent-dark); text-decoration: underline; }

/* Code listings */
.preprint-doc pre.lstlisting, .preprint-doc pre.listings, .preprint-doc pre.verbatim{
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.88rem;
    background: #eae8e1;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.8rem 1rem;
    overflow-x: auto;
}

.preprint-doc code.lstinline, .preprint-doc code.verb{
    font-family: 'JetBrains Mono', monospace;
    background: #eae8e1;
    padding: 0.1em 0.35em;
    border-radius: 3px;
    font-size: 0.88em;
}

/* Monospace spans from tex4ht */
.ectt-1000, .ectt-1095, .ectt-0900{
    font-family: 'JetBrains Mono', monospace !important;
}

/* Blockquotes (use case questions) */
.preprint-doc blockquote, .quote{
    border-left: 3px solid var(--accent-color);
    background: var(--accent-light);
    padding: 0.8rem 1.2rem;
    border-radius: 0 4px 4px 0;
    margin: 1em 0;
}

/* Tables */
.preprint-doc table.tabular{
    font-size: 0.88rem;
    border-collapse: collapse;
    width: 100%;
}

.preprint-doc table.tabular td, .preprint-doc table.tabular th{
    padding: 0.45rem 0.6rem;
}

.preprint-doc table.tabular tr:hover{
    background: #eae8e1;
}

.preprint-doc div.caption, .preprint-doc figcaption.caption{
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Figure */
.preprint-doc figure.figure{ margin: 2rem 0; }
.preprint-doc figure.figure img, .preprint-doc figure.figure svg{ max-width: 100%; height: auto; }

/* References */
.preprint-doc dd.thebibliography{
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.55;
}
.preprint-doc dt.thebibliography{
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.85rem;
}

/* Navigation bar */
.paper-nav{
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 0;
    margin-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-light);
}
.paper-nav a{ color: var(--accent-color); font-weight: 500; }
.paper-nav a:hover{ color: var(--accent-dark); }

/* Override tex4ht font-size classes to not shrink text */
.ecrm-1000, .ecbx-1000, .ectt-1000, .ecti-1000, .ecrm-0900, .ectt-0900, .tcrm-0900{ font-size: inherit; }

/* Figures are colour diagrams with transparent backgrounds. make4ht emits a
   default rule that inverts every figure in dark mode (good for black-on-white
   line art, but it corrupts our colours and turns the light fills near-black).
   Override it: never invert, and sit the figures on white so they read the same
   in light and dark colour schemes. This block is appended after make4ht's CSS,
   so it wins the cascade. */
.preprint-doc figure.figure img, .preprint-doc figure.figure svg, .preprint-doc img[src^="main"]{ background: #fff; }
@media (prefers-color-scheme: dark) {
    .preprint-doc img[src^="main"]{ filter: none; }
}

/* Print */
@media print {
    .preprint-doc{ max-width: none; padding: 0; background: #fff; }
    .preprint-doc a{ color: inherit; }
}