/*
 * AI6 theme based on the University of Bayreuth's "Blaupause" web design.
 * Original, small Hugo-specific stylesheet using measured reference colors,
 * typography, dimensions and layout; no remote CSS, scripts or fonts.
 * Reference: https://www.theoinf.uni-bayreuth.de/en/index.html
 * Served through Hugo Pipes with a content-hashed filename.
 */
:root {
  --ubt-green: #009260;
  --ubt-green-hover: #007e54;
  --ubt-ink: #666666;
  --ubt-light-ink: #999999;
  --ubt-panel: #f0f0ed;
  --ubt-gray-bar: #bfbfbf;
  --ubt-border: #999999;
  --ubt-width: 1100px;
  font-family: sans-serif;
  font-size: 16px;
  line-height: 1.4;
  color: var(--ubt-ink);
  background: #fff;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: #fff; color: var(--ubt-ink); }
img { max-width: 100%; height: auto; vertical-align: middle; }
a { color: var(--ubt-ink); text-underline-offset: 2px; }
a:hover { color: var(--ubt-green); }
button, input, textarea { font: inherit; }
:focus-visible { outline: 2px solid var(--ubt-green); outline-offset: 3px; }
.site-frame { width: min(calc(100% - 30px), var(--ubt-width)); margin: 0 auto; }
.skip-link { position: absolute; top: -100px; left: 16px; padding: 9px 12px; color: #fff; background: var(--ubt-green); z-index: 20; }
.skip-link:focus { top: 8px; }

/* University reference masthead: 221×68 logo, 34px green and gray bars. */
.site-header { margin-top: 33px; }
.masthead { height: 96px; display: flex; justify-content: space-between; align-items: flex-start; }
.university-logo { display: block; width: 221px; height: 68px; flex: none; }
.university-logo img { display: block; width: 221px; height: 68px; }
.masthead-right { align-self: flex-start; display: flex; flex-direction: column; align-items: flex-end; gap: 5px; }
.masthead-links { display: flex; gap: 10px; justify-content: flex-end; align-items: center; padding-top: 2px; font-size: 11px; font-weight: 700; }
.masthead-links a { text-decoration: none; }
.masthead-links a:hover { color: var(--ubt-green); text-decoration: underline; }
.workgroup-logo { display: block; line-height: 0; }
.workgroup-logo img { display: block; width: 112px; height: auto; }
.faculty-band, .workgroup-band { min-height: 34px; padding: 7px 30px; line-height: 20px; font-size: 14px; }
.faculty-band { background: var(--ubt-green); color: #fff; text-transform: uppercase; font-weight: 700; }
.faculty-band a { color: #fff; text-decoration: none; }
.faculty-band a:hover { color: #e0f5eb; }
.workgroup-band { background: var(--ubt-panel); font-weight: 600; }
.utility-row { min-height: 38px; display: flex; justify-content: space-between; gap: 20px; align-items: center; }
.breadcrumbs { display: flex; align-items: center; gap: 8px; font-size: 11px; font-style: italic; }
.breadcrumbs a { color: var(--ubt-green); text-decoration: none; }
.breadcrumbs [aria-current] { color: var(--ubt-light-ink); overflow-wrap: anywhere; }
.print-link { cursor: pointer; padding: 0; border: none; background: none; color: var(--ubt-ink); text-decoration: underline; font-size: 11px; font-style: italic; white-space: nowrap; }
.print-link:hover { color: var(--ubt-green); }
.menu-toggle { display: none; border: 1px solid var(--ubt-border); background: var(--ubt-panel); color: var(--ubt-ink); padding: 8px 12px; cursor: pointer; }

/* The reference's left navigation (200px), right content (880px). */
.content-layout { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 20px; align-items: start; }
.main-nav ul { list-style: none; padding: 0; margin: 0; border-bottom: 1px solid var(--ubt-border); }
.main-nav li { margin: 0; }
.main-nav a { display: block; border-top: 1px solid var(--ubt-border); padding: 6px 0; color: var(--ubt-ink); text-decoration: none; font-size: 14px; font-weight: 500; line-height: 20px; }
.main-nav a:hover { color: var(--ubt-light-ink); }
.main-nav a[aria-current="page"] { color: var(--ubt-green); }
.site-main { min-width: 0; }

/* Four self-contained algorithm illustrations; readable without JavaScript. */
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.home-banner { position: relative; overflow: hidden; background: var(--ubt-panel); }
.home-slides { position: relative; height: 350px; }
.home-slide { position: absolute; inset: 0; margin: 0; opacity: 0; visibility: hidden; transition: opacity .6s ease, visibility 0s linear .6s; }
.home-slide.is-active { opacity: 1; visibility: visible; transition: opacity .6s ease, visibility 0s; }
.home-slide img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: center; }
.home-carousel-controls { position: absolute; left: 50%; bottom: 8px; z-index: 2; transform: translateX(-50%); }
.home-carousel-dots { display: flex; align-items: center; gap: 3px; }
.home-carousel-dot { width: 28px; height: 28px; display: grid; place-items: center; border: 0; cursor: pointer; background: transparent; }
.home-carousel-dot::before { content: ""; display: block; width: 10px; height: 10px; border: 1.5px solid var(--ubt-green-hover); border-radius: 50%; background: white; }
.home-carousel-dot.is-active::before { border-color: var(--ubt-green); background: var(--ubt-green); }
.home-carousel-dot:hover::before { border-color: var(--ubt-green); }
.home-columns { display: grid; grid-template-columns: minmax(0, 1fr) 280px; align-items: start; gap: 20px; margin-top: 50px; }
.home-copy { min-width: 0; }
.home-copy h1 { font-size: 24px; font-weight: 300; line-height: 1.2; margin: 0 0 18px; }
.home-copy > p:first-of-type { margin-top: 0; }
.news-panel { min-width: 0; font-size: 13px; background: var(--ubt-panel); }
.news-panel h2 { margin: 0; display: flex; align-items: stretch; min-height: 49px; background: var(--ubt-gray-bar); color: #fff; font-size: 16px; font-weight: 400; line-height: 49px; }
.news-panel h2 > span:last-child { padding: 0 11px; }
.news-symbol { display: grid; place-items: center; width: 69px; flex: none; background: var(--ubt-green); font-size: 31px; line-height: 1; }
.news-panel-body { padding: 13px 15px 4px; }
.news-panel-item { padding: 8px 0 17px; margin-bottom: 13px; border-bottom: 1px solid #d4d4d0; }
.news-panel-item time { display: block; color: #777; font-size: 12px; line-height: 1.5; }
.news-panel-item a { display: block; color: var(--ubt-ink); font-weight: 600; font-size: 13px; }
.news-panel-item a:hover { color: var(--ubt-green); }
.all-news { text-align: right; margin: 9px 0 16px; }
.all-news a { color: var(--ubt-green); }

/* Standard content pages reuse the reference's unboxed, white article area. */
.page-shell { padding: 0 0 50px; }
.content-card { min-height: 300px; }
.page-heading { margin: 0 0 24px; }
.page-heading h1 { font-size: 24px; font-weight: 300; line-height: 1.2; margin: 0 0 10px; }
.page-type { display: block; text-transform: uppercase; color: var(--ubt-green); font-size: 12px; font-weight: 600; margin-bottom: 6px; }
.date-line { font-size: 13px; color: var(--ubt-light-ink); }
.prose { overflow-wrap: anywhere; }
.prose p { margin: 0 0 20px; line-height: 1.2; }
.prose h1, .prose h2, .prose h3, .prose h4 { font-weight: 400; line-height: 1.2; color: var(--ubt-ink); }
.prose h1 { font-size: 24px; }
.prose h2 { font-size: 20px; margin: 24px 0 15px; }
.prose h3 { font-size: 16px; margin: 19px 0 12px; }
.prose a { color: var(--ubt-green); }
.prose ul, .prose ol { padding-left: 22px; margin: 0 0 20px; }
.prose li { margin: 5px 0; }
.prose table { display: block; width: 100%; max-width: 100%; overflow-x: auto; border-collapse: collapse; margin: 15px 0 22px; }
.prose th, .prose td { border: 1px solid #ccc; padding: 7px 10px; text-align: left; }
.prose th { background: var(--ubt-panel); }
.prose blockquote { margin: 15px 0 22px; padding: 10px 20px; border-left: 4px solid var(--ubt-green); background: var(--ubt-panel); }
.prose img { max-width: 100%; }
.prose code { overflow-wrap: anywhere; }
.prose pre { max-width: 100%; overflow-x: auto; padding: 15px; background: var(--ubt-panel); }
.course-semester { font-size: 16px; font-weight: 600; color: var(--ubt-green); margin: 6px 0 12px !important; }
.course-term + .course-term { margin-top: 28px; }
.course-catalog table { font-size: 13px; line-height: 1.35; }
.course-catalog th, .course-catalog td { padding: 8px 7px; vertical-align: top; }
.course-catalog td a { overflow-wrap: anywhere; }
.course-source { color: var(--ubt-light-ink); font-size: 12px; margin: 10px 0 24px !important; }

/* Legacy Markdown shortcodes: retain all people, news, seminar and gallery UI. */
.item-list, .news-list, .publication-list { display: grid; gap: 0; margin: 20px 0; }
.item-link { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 6px 14px; border-bottom: 1px solid #ccc; padding: 9px 2px; color: var(--ubt-ink); font-size: 15px; text-decoration: none; }
.item-link:first-child { border-top: 1px solid #ccc; }
.item-link:hover { color: var(--ubt-green); }
.item-link small { color: var(--ubt-light-ink); font-size: 12px; }
.people-grid, .gallery-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 18px; margin: 20px 0; }
.person-card { display: block; border-bottom: 1px solid #ccc; color: var(--ubt-ink); text-decoration: none; }
.person-card img { width: 100%; height: 180px; object-fit: cover; background: var(--ubt-panel); }
.person-card span { display: block; padding: 8px 0; font-size: 14px; }
.person-card[href]:hover span { color: var(--ubt-green); }
.member-profile { display: grid; grid-template-columns: 140px 1fr; gap: 20px; align-items: start; padding: 18px; background: var(--ubt-panel); }
.member-profile img { width: 140px; max-width: 100%; }
.member-profile dl { margin: 0; display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 4px 14px; }
.member-profile dt { font-weight: 600; }
.member-profile dd { margin: 0; overflow-wrap: anywhere; }
.publication-list { list-style: none; padding: 0; }
.publication-list li { padding: 9px 0; border-bottom: 1px solid #ccc; }
.publication-title { display: block; color: var(--ubt-ink); font-weight: 600; }
.publication-meta { display: block; color: var(--ubt-light-ink); font-size: 14px; }
.publication-years { margin: 24px 0 8px; color: var(--ubt-green); font-size: 18px; font-weight: 600; }
.gallery-grid figure { margin: 0; }
.gallery-grid img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.gallery-grid figcaption { margin-top: 5px; font-size: 13px; }
.button { display: inline-block; padding: 8px 15px; background: var(--ubt-green); color: #fff; text-decoration: none; }
.button:hover { background: var(--ubt-green-hover); color: #fff; }

/* Quiet institutional footer: not a second visual banner. */
.site-footer { border-top: 1px solid #b4b4b4; padding: 21px 0 15px; margin-top: 50px; font-size: 13px; }
.footer-main p { margin: 0 0 6px; }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; border-top: 1px solid #ddd; padding-top: 13px; margin-top: 17px; font-size: 12px; }
.footer-bottom > div { display: flex; flex-wrap: wrap; gap: 20px; }

@media (max-width: 800px) {
  .site-header { margin-top: 0; }
  .masthead { height: auto; min-height: 90px; align-items: flex-start; padding: 15px 0; gap: 15px; }
  .university-logo, .university-logo img { width: 190px; height: auto; }
  .faculty-band, .workgroup-band { padding: 9px 15px; }
  .utility-row { min-height: 42px; }
  .print-link { display: none; }
  .menu-toggle { display: block; width: 100%; margin-bottom: 12px; text-align: left; font-size: 14px; }
  .content-layout { grid-template-columns: 1fr; gap: 18px; }
  .main-nav { display: none; }
  .main-nav.is-open { display: block; }
  .main-nav ul { border: none; }
  .main-nav a { padding-left: 12px; }
  .home-slides { height: auto; aspect-ratio: 2.5 / 1; }
  .home-columns { margin-top: 32px; }
}
@media (max-width: 650px) {
  .site-frame { width: min(calc(100% - 24px), var(--ubt-width)); }
  .university-logo, .university-logo img { width: min(44vw, 170px); }
  .masthead-links { flex-direction: column; align-items: flex-end; gap: 2px; }
  .masthead-links span { display: none; }
  .workgroup-logo img { width: 90px; }
  .home-columns { grid-template-columns: 1fr; gap: 25px; }
  .home-carousel-controls { bottom: 2px; }
  .home-copy h1, .page-heading h1 { font-size: 22px; }
  .news-panel { max-width: 420px; }
  .member-profile { grid-template-columns: 1fr; }
  .member-profile dl { grid-template-columns: 1fr; }
  .member-profile dt { margin-top: 8px; }
}
@media print {
  .site-frame { width: 100%; }
  .site-header { margin-top: 0; }
  .masthead-links, .utility-row, .main-nav, .menu-toggle, .news-panel, .site-footer { display: none !important; }
  .content-layout { display: block; }
  .home-columns { display: block; }
  .home-slides { height: 190px; }
  .home-slide:not(.is-active), .home-carousel-controls { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  .home-slide, .home-slide.is-active { transition: none; }
}