/* Lukas Kühne — a small, responsive academic homepage. */
:root {
  color-scheme: light;
  --paper: #faf9f6;
  --ink: #25313b;
  --muted: #59656d;
  --accent: #244f69;
  --accent-hover: #13374f;
  --rule: #d9ddd9;
  --soft: #eef1ee;
  --focus: #a14615;
  --content-width: 1120px;
  --header-height: 81px;
  --serif: Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 24px); }
body { margin: 0; color: var(--ink); background: var(--paper); font: 400 16px/1.65 var(--sans); -webkit-text-size-adjust: 100%; }
button { font: inherit; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: .2em; }
a:hover { color: var(--accent-hover); }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--focus); outline-offset: 5px; border-radius: 2px; }
::selection { color: var(--ink); background: #dbe6e9; }
img { max-width: 100%; height: auto; }
p, h1, h2, h3, h4, figure { margin: 0; }
p + p { margin-top: 12px; }
ul, ol { margin: 0; padding: 0; }
h1, h2 { font-family: var(--serif); font-weight: 400; }
h3, h4 { font-weight: 600; }
sub { font-size: .7em; line-height: 0; }
address { font-style: normal; }
[id] { scroll-margin-top: 24px; }
[hidden] { display: none !important; }

.skip-link { position: fixed; left: 16px; top: -100px; padding: 10px 16px; background: var(--paper); border: 1px solid var(--accent); z-index: 20; }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; z-index: 10; background: var(--paper); border-bottom: 1px solid var(--rule); }
.header-inner { max-width: var(--content-width); min-height: 80px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.wordmark { flex-shrink: 0; font: 400 25px/1.2 var(--serif); letter-spacing: -.7px; color: var(--ink); text-decoration: none; }
.site-navigation { display: flex; align-items: center; gap: 25px; }
.site-navigation a { display: inline-flex; align-items: center; min-height: 44px; color: var(--muted); font-size: 14px; text-decoration: none; white-space: nowrap; position: relative; }
.site-navigation a:hover, .site-navigation a[aria-current] { color: var(--ink); }
.site-navigation a[aria-current]::after { content: ""; position: absolute; bottom: 4px; left: 0; right: 0; height: 2px; background: var(--accent); }
.nav-toggle { display: none; }
.site-main { max-width: var(--content-width); margin: 0 auto; }
.site-main:focus { outline: none; }

.hero { display: grid; grid-template-columns: minmax(0, 1fr) 340px; column-gap: 72px; row-gap: 32px; align-items: start; padding: 48px 0; }
.hero-copy { padding-top: 8px; }
.eyebrow { color: var(--muted); font-size: 13px; letter-spacing: .045em; }
h1 { font-size: clamp(44px, 5.4vw, 66px); line-height: 1.12; letter-spacing: -2px; margin: 14px 0 13px; }
.role { font-size: 17px; }
.role span { color: var(--muted); }
.intro, .research-copy { font-size: 17px; line-height: 1.65; max-width: 57ch; }
.intro { margin-top: 26px; }
.research-copy { margin-top: 12px; }
.profile-links { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 25px; margin-top: 24px; }
.profile-links a { display: inline-flex; gap: 8px; align-items: center; min-height: 44px; font-size: 14px; font-weight: 500; }
.profile-links span[aria-hidden] { font-size: 15px; }
.link-format { color: var(--muted); font-size: 11px; font-weight: 400; letter-spacing: .04em; text-decoration: none; }
.portrait { width: 100%; }
.portrait img { display: block; width: 100%; background: #343434; border-radius: 3px; }
.portrait figcaption { margin-top: 10px; color: var(--muted); font-size: 11px; line-height: 1.5; }

.section { display: grid; grid-template-columns: 218px minmax(0, 1fr); gap: 54px; padding: 48px 0 52px; border-top: 1px solid var(--rule); }
.section-heading h2 { font-size: 31px; line-height: 1.2; letter-spacing: -.75px; }
.section-heading > p { color: var(--muted); font-size: 14px; line-height: 1.6; margin-top: 12px; max-width: 22ch; }
.section-heading .text-link { display: inline-block; font-size: 13px; margin-top: 20px; }
.section-content { min-width: 0; }
.group-heading { font-size: 14px; letter-spacing: .01em; margin: 3px 0 12px; display: flex; align-items: baseline; gap: 10px; }
.group-heading:not(:first-child) { margin-top: 36px; }
.item-count { color: var(--muted); font-size: 12px; font-weight: 400; }
.papers { list-style: none; }
.paper { display: grid; grid-template-columns: 58px minmax(0, 1fr); gap: 18px; padding: 21px 0; }
.paper + .paper { border-top: 1px solid var(--rule); }
.paper-year { color: var(--muted); font-size: 12px; padding-top: 3px; font-variant-numeric: tabular-nums; }
.paper-body { min-width: 0; }
.paper-title { font-family: var(--serif); font-size: 21px; line-height: 1.4; letter-spacing: -.1px; font-weight: 400; }
.paper-title a { text-decoration: none; color: var(--ink); }
.paper-title a:hover { color: var(--accent); text-decoration: underline; }
.paper-authors, .paper-venue { font-size: 14px; line-height: 1.6; color: var(--muted); }
.paper-authors { margin-top: 6px; }
.paper-venue { margin-top: 4px; }
.paper-notes { color: var(--muted); font-size: 13px; line-height: 1.65; margin-top: 9px; }
.paper-links { display: flex; gap: 20px; align-items: center; flex-wrap: wrap; margin-top: 8px; }
.paper-links a { display: inline-flex; align-items: center; min-height: 32px; font-size: 13px; }

.archive { border-top: 1px solid var(--rule); margin-top: 18px; }
.archive summary { padding: 18px 24px 18px 0; color: var(--accent); font-size: 14px; cursor: pointer; position: relative; }
.archive summary::marker { color: var(--accent); font-size: 11px; }
.archive-meta { color: var(--muted); font-size: 12px; display: inline; margin-left: 12px; }
.archive[open] summary { margin-bottom: 8px; }
.archive > p { padding: 0 0 16px; color: var(--muted); font-size: 14px; }
.archive .papers { margin-top: 0; }
.software-project + .software-project { margin-top: 30px; padding-top: 28px; border-top: 1px solid var(--rule); }
.software-project h3 { font: 400 23px/1.35 var(--serif); margin-bottom: 12px; }
.software-project h3 a { text-decoration: none; }
.software-project h3 a:hover { text-decoration: underline; }
.software-project p { color: var(--muted); font-size: 15px; }
.current-course { background: var(--soft); border-left: 3px solid var(--accent); padding: 22px 25px; }
.current-course h3 { font: 400 26px/1.3 var(--serif); margin: 9px 0 7px; }
.current-course > p:last-child { color: var(--muted); font-size: 14px; }
.teaching-history { list-style: none; padding: 0 0 14px; }
.teaching-history > li { margin: 10px 0 23px; }
.teaching-history h4 { font-size: 14px; margin-bottom: 6px; }
.course-list { padding-left: 20px; color: var(--muted); font-size: 14px; }
.course-list li + li { margin-top: 6px; }
.outreach { margin-top: 29px; }
.outreach h3 { font-size: 15px; margin-bottom: 10px; }
.outreach p { color: var(--muted); font-size: 14px; }
.biography, .text-list, .grants-list, .events-list, .travel-list { list-style: none; }
.biography li, .text-list li, .grants-list li, .events-list li, .travel-list li { font-size: 15px; color: var(--muted); }
.biography li + li, .text-list li + li { margin-top: 12px; }
.biography-note { color: var(--muted); font-size: 14px; margin-top: 22px; }
.grants-list li + li, .events-list li + li { padding-top: 18px; margin-top: 18px; border-top: 1px solid var(--rule); }
.events-list { margin: 14px 0 26px; }
.events-list a { color: var(--ink); }
.events-list a:hover { color: var(--accent); }
.travel-list { padding: 4px 0 16px; }
.travel-list li { padding: 13px 0; }
.travel-list li + li { border-top: 1px solid var(--rule); }

.hero-contact { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .85fr) minmax(0, 1fr); gap: 12px 32px; border-top: 1px solid var(--rule); padding-top: 22px; }
.hero-contact h2 { grid-column: 1 / -1; font-size: 22px; line-height: 1.3; }
.hero-contact p, .hero-contact address { font-size: 13px; line-height: 1.75; }
.hero-contact address { color: var(--muted); }
.contact-details { margin: 0; font-size: 13px; }
.contact-details > div { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 10px; }
.contact-details dt { color: var(--muted); }
.contact-details dd { margin: 0; overflow-wrap: anywhere; }
.email-link { overflow-wrap: anywhere; }
.site-footer { border-top: 1px solid var(--rule); }
.site-footer > div { max-width: var(--content-width); margin: 0 auto; display: flex; align-items: center; flex-wrap: wrap; gap: 12px 24px; min-height: 86px; font-size: 12px; color: var(--muted); }
.site-footer span:first-child { color: var(--ink); margin-right: auto; }
.site-footer a { white-space: nowrap; }

@media (max-width: 1216px) {
  .header-inner, .site-main, .site-footer > div { margin-left: 48px; margin-right: 48px; }
  .hero { column-gap: 48px; }
  .section { grid-template-columns: 185px minmax(0, 1fr); gap: 40px; }
}
@media (max-width: 1000px) {
  .site-navigation { gap: 17px; }
  .hero { grid-template-columns: minmax(0, 1fr) 290px; column-gap: 36px; padding-top: 44px; padding-bottom: 44px; }
  .section { grid-template-columns: 165px minmax(0, 1fr); gap: 30px; }
  .section-heading h2 { font-size: 28px; }
}
@media (max-width: 900px) {
  .header-inner, .site-main, .site-footer > div { margin-left: 32px; margin-right: 32px; }
  .hero { grid-template-columns: minmax(0, 1fr) 260px; column-gap: 30px; }
  .role { font-size: 15px; }
  .intro, .research-copy { font-size: 16px; }
  .site-navigation { gap: 14px; }
  .site-navigation a { font-size: 13px; }
  .wordmark { font-size: 23px; }
  .section { grid-template-columns: 1fr; gap: 28px; padding: 36px 0 40px; }
  .section-heading { display: flex; align-items: baseline; gap: 12px 22px; flex-wrap: wrap; }
  .section-heading > p { max-width: none; margin-top: 0; }
  .section-heading .text-link { margin-top: 0; }
}
@media (max-width: 760px) {
  :root { --header-height: 72px; }
  .header-inner { min-height: 71px; gap: 0 20px; flex-wrap: wrap; }
  .wordmark { padding: 20px 0; }
  .site-navigation { flex-basis: 100%; gap: 4px 22px; flex-wrap: wrap; padding-bottom: 14px; }
  .site-navigation a { font-size: 14px; }
  .js .nav-toggle { display: inline-flex; align-items: center; justify-content: space-between; gap: 15px; margin-left: auto; min-width: 80px; min-height: 44px; padding: 8px 0 8px 12px; border: 0; color: var(--ink); background: transparent; font-size: 14px; cursor: pointer; }
  .nav-toggle > span { font-size: 20px; line-height: 1; }
  .js .site-navigation { display: none; }
  .js .site-header[data-menu-open] .site-navigation { display: flex; }
  .hero { padding-top: 36px; padding-bottom: 40px; row-gap: 26px; }
  .hero h1 { font-size: 44px; }
}
@media (max-width: 640px) {
  .header-inner, .site-main, .site-footer > div { margin-left: 24px; margin-right: 24px; }
  .hero { grid-template-columns: 1fr; gap: 26px; }
  .hero-copy { padding-top: 0; }
  .hero-contact { grid-template-columns: 1fr; grid-row: 2; gap: 12px; }
  .hero > .portrait { grid-row: 3; }
  h1 { letter-spacing: -1.5px; }
  .intro { margin-top: 20px; }
  .profile-links { margin-top: 16px; gap: 5px 24px; }
  .portrait { max-width: 320px; }
  .section { gap: 20px; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 7px; }
  .section-heading .text-link { margin-top: 10px; }
  .paper { grid-template-columns: 48px minmax(0, 1fr); gap: 13px; padding: 20px 0; }
  .paper-title { font-size: 20px; }
  .paper-year { font-size: 11px; }
  .paper-authors, .paper-venue { font-size: 13px; }
  .paper-notes { font-size: 12px; }
  .archive-meta { margin-left: 6px; }
  .site-footer > div { padding: 24px 0; min-height: auto; }
  .site-footer span:first-child { width: 100%; }
}
@media (max-width: 380px) {
  .header-inner, .site-main, .site-footer > div { margin-left: 20px; margin-right: 20px; }
  .hero h1 { font-size: 41px; }
  .paper { grid-template-columns: 1fr; gap: 5px; }
  .paper-year { font-size: 12px; }
  .archive-meta { display: block; margin-left: 16px; margin-top: 3px; }
}
@media (pointer: coarse) {
  .paper-links a { min-height: 44px; }
  .paper-links { gap: 24px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
@media print {
  :root { --ink: #000; --muted: #333; --paper: #fff; --accent: #000; }
  html { scroll-padding-top: 0; }
  body { font-size: 10pt; }
  .site-header, .skip-link, .site-footer a { display: none; }
  .site-main, .site-footer > div { margin: 0; max-width: none; }
  .hero { grid-template-columns: 1fr 180px; gap: 32px; padding: 0 0 26px; }
  .hero h1 { font-size: 32pt; }
  .hero .intro, .hero .research-copy { font-size: 10pt; }
  .profile-links { margin-top: 10px; }
  .section { display: block; padding: 22px 0; }
  .section-heading { margin-bottom: 16px; }
  .section-heading h2 { font-size: 20pt; }
  .paper { grid-template-columns: 44px 1fr; padding: 12px 0; break-inside: avoid; }
  .paper-title { font-size: 12pt; }
  .paper-authors, .paper-venue, .paper-notes { font-size: 9pt; }
  .paper-links { display: none; }
  .software-project, .current-course, .hero-contact, .teaching-history > li { break-inside: avoid; }
  .archive { border-top: 0; }
  .archive summary { padding-left: 0; font-weight: 600; }
  a { text-decoration: none; }
}