.research-theme#optimization, .topic-nav a[href="#optimization"] { --accent: var(--blue); --soft: var(--blue-soft); --accent-border: var(--blue-border); }
.research-theme#transport-design, .topic-nav a[href="#transport-design"] { --accent: var(--teal); --soft: var(--teal-soft); --accent-border: var(--teal-border); }
.research-theme#learning-autonomous-systems, .topic-nav a[href="#learning-autonomous-systems"] { --accent: var(--terracotta); --soft: var(--terracotta-soft); --accent-border: var(--terracotta-border); }
.research-page .page-heading { margin-bottom: 2.5rem; }
.research-page .page-heading > p { max-width: 780px; font-size: 1.0625rem; }
.topic-nav { margin-top: 1.8rem; }
.topic-nav ul { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .6rem .75rem; list-style: none; padding: 0; }
.topic-nav li { display: flex; padding: 0; margin: 0; }
.topic-nav a { display: flex; align-items: center; width: 100%; min-height: 4.2rem; padding: .7rem .85rem; border: 1px solid var(--accent-border); border-left: 3px solid var(--accent); border-radius: 5px; color: var(--accent); background: var(--soft); text-decoration: none; font-size: .9375rem; font-weight: 600; }
.topic-nav a:hover { border-color: var(--accent); background: #fff; }
.research-theme { padding-top: 2.5rem; margin-bottom: 2.8rem; border-top: 1px solid var(--line); }
.research-theme:first-of-type { padding-top: 0; border-top: 0; }
.theme-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; padding: .8rem 1rem; margin-bottom: 1.25rem; border-left: 3px solid var(--accent); border-radius: 0 6px 6px 0; background: linear-gradient(90deg, var(--soft), var(--bg)); }
.theme-heading h2 { margin: 0; font-family: Georgia, "Times New Roman", serif; font-size: clamp(1.5rem, 3vw, 1.85rem); font-weight: 400; line-height: 1.3; letter-spacing: -.015em; }
.theme-heading .back-to-top { flex-shrink: 0; color: var(--muted); font-size: .8125rem; text-decoration: none; }
.theme-heading .back-to-top:hover { color: var(--accent); text-decoration: underline; }
.theme-intro { max-width: 850px; margin: 0 0 1.7rem; color: var(--muted); line-height: 1.75; }
.theme-intro strong { color: var(--accent); font-weight: 600; }
.paper-list { list-style: none; padding: 0; margin: 0; }
.paper-list > li { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); align-items: start; gap: 2rem; padding: 1.8rem 0; margin: 0; border-top: 1px solid #e9edf1; }
.paper-copy { min-width: 0; }
.paper-list h3 { margin: 0 0 .35rem; font-size: 1.0625rem; line-height: 1.55; font-weight: 600; }
.paper-title { color: var(--text); text-decoration: none; }
.paper-title:hover { color: var(--accent); text-decoration: underline; }
.paper-authors { margin: 0 0 .15rem; font-size: .875rem; color: var(--muted); line-height: 1.65; }
.paper-authors strong { color: var(--text); font-weight: 600; }
.paper-details { margin: 0; color: var(--muted); font-size: .8125rem; line-height: 1.8; }
.paper-tags { display: flex; flex-wrap: wrap; gap: .3rem .4rem; margin: .7rem 0 0; color: var(--muted); font-size: .6875rem; line-height: 1.65; }
.paper-tags span { padding: .1rem .45rem; border: 1px solid var(--line); border-radius: 3px; background: #fff; }
.paper-contribution { margin: 1rem 0 0; padding: .65rem .85rem; border-left: 2px solid var(--accent-border); border-radius: 0 4px 4px 0; background: var(--soft); font-size: .9375rem; line-height: 1.65; }
.paper-visual { min-width: 0; margin: 0; border: 1px solid var(--accent-border); border-radius: 6px; overflow: hidden; background: #fff; }
.paper-image-link { display: flex; align-items: center; justify-content: center; padding: .65rem; }
.paper-image-link:hover { background: var(--soft); }
.paper-image-link img { display: block; width: 100%; height: auto; max-height: 320px; object-fit: contain; }
.paper-visual figcaption { padding: .65rem .8rem; border-top: 1px solid var(--accent-border); color: var(--muted); font-size: .8125rem; line-height: 1.55; background: var(--soft); }
.paper-visual table { width: 100%; border-collapse: collapse; table-layout: fixed; font-size: .8125rem; line-height: 1.55; }
.paper-visual caption { padding: .8rem; text-align: left; font-size: .9375rem; font-weight: 600; color: var(--accent); }
.paper-visual th, .paper-visual td { padding: .55rem .7rem; text-align: left; vertical-align: top; border-top: 1px solid #e9edf1; }
.paper-visual thead th { background: var(--soft); font-weight: 600; }
.paper-visual tbody th { font-weight: 500; }
.paper-visual tbody td { color: var(--accent); }
.preprint-badge { display: inline-block; margin-left: .45rem; padding: 0 .45rem; border: 1px dashed #8f72b5; border-radius: 3px; background: #faf6ff; color: #6b418c; font-size: .6875rem; font-family: Arial, Helvetica, sans-serif; font-weight: 500; line-height: 1.7; vertical-align: .1em; white-space: nowrap; letter-spacing: .015em; }
.research-note { margin: 1rem 0 0; color: var(--muted); font-size: .8125rem; }

@media (max-width: 800px) {
  .topic-nav ul { grid-template-columns: 1fr; }
  .paper-list > li { grid-template-columns: 1fr; gap: 1.15rem; }
  .paper-visual { width: 100%; max-width: 600px; }
}
@media (max-width: 480px) {
  .topic-nav ul { grid-template-columns: 1fr; gap: .15rem; }
  .theme-heading { align-items: flex-start; }
  .theme-heading .back-to-top { padding-top: .25rem; }
  .research-theme { padding-top: 2rem; }
}
@media print {
  .topic-nav, .back-to-top { display: none; }
  .paper-list > li { grid-template-columns: 1.2fr 1fr; gap: 1rem; padding-block: 1rem; break-inside: avoid; }
  .paper-visual { break-inside: avoid; }
}