/* ============================================================
   Design tokens
   Layout: top nav, then each section as a row with a sticky
   heading on the left and content on the right. One shared
   content width; the page width is derived from it so rules
   end where the text ends.
   ============================================================ */
:root {
  --bg: #fcfbf9;
  --fg: #1b1f26;
  --muted: #646a74;
  --faint: #9ca3ad;
  --rule: #e6e4df;
  --accent: #0b63a6;

  --font-display: "Newsreader", "Iowan Old Style", Georgia, serif;
  --font-body: "Source Sans 3", "Helvetica Neue", Arial, sans-serif;

  --measure: 85ch;                 /* content column width */
  --label: 180px;                  /* section heading column */
  --gutter: 3rem;                  /* gap between heading and content */
  --maxw: calc(var(--label) + var(--gutter) + var(--measure));
  --topbar-h: 3.5rem;
}

/* ============================================================
   Quarto / Bootstrap resets
   ============================================================ */
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  padding: 0 16px !important;
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

#quarto-content {
  display: block !important;
  padding: 0 !important;
  margin: 0 !important;
  max-width: none !important;
}

#quarto-content h1,
#quarto-content h2,
#quarto-content h3 {
  font-family: var(--font-display);
  font-weight: 500;
  margin: 0;
  padding: 0;
  border: 0;
  line-height: 1.15;
  text-wrap: balance;
  color: var(--fg);
}

#quarto-content p { margin: 0; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent); text-decoration: underline; text-underline-offset: 0.15em; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }

.wrap { max-width: var(--maxw); margin-inline: auto; }

/* ============================================================
   Top bar
   ============================================================ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(252, 251, 249, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
  margin-inline: -16px;
  padding-inline: 16px;
}

.topbar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: var(--topbar-h);
}

.brand {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--fg);
}
.brand:hover { color: var(--fg); text-decoration: none; }

.topnav { display: flex; gap: 1.5rem; font-size: 0.9rem; }
.topnav a { color: var(--muted); }
.topnav a:hover,
.topnav a.on { color: var(--fg); text-decoration: none; }
.topnav a.on { box-shadow: inset 0 -1.5px 0 var(--accent); }
.topnav .ext { font-size: 0.8em; color: var(--faint); }

/* ============================================================
   Intro (photo, name, title, links)
   ============================================================ */
.intro {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2.5rem;
  align-items: end;
  padding-block: 3.5rem 3rem;
}

.photo {
  display: block;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background: var(--rule);
}

.intro .name {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.1;
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  letter-spacing: -0.015em;
}

.intro .title {
  font-size: 1.1rem;
  color: var(--muted);
  margin-top: 0.5rem;
  line-height: 1.45;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.25rem;
  padding: 0;
  margin: 1.5rem 0 0;
  list-style: none;
  font-size: 0.95rem;
}
.links a { display: inline-flex; align-items: center; gap: 0.4rem; }
.links svg { width: 15px; height: 15px; flex: none; }
.links .ext { font-size: 0.8em; color: var(--faint); }

/* ============================================================
   Sections: Quarto wraps each ## heading in section.level2
   ============================================================ */
#quarto-content section.level2 {
  display: grid;
  grid-template-columns: var(--label) 1fr;
  gap: 1.5rem var(--gutter);
  padding-block: 2.5rem;
  margin: 0;
  border-top: 1px solid var(--rule);
  scroll-margin-top: calc(var(--topbar-h) + 0.5rem);
}

#quarto-content section.level2 > h2 {
  position: sticky;
  top: calc(var(--topbar-h) + 1rem);
  align-self: start;
  font-size: 1.5rem;
  line-height: 1.1;
}

.sec-body { min-width: 0; max-width: var(--measure); }

/* ============================================================
   About
   ============================================================ */
.prose { display: grid; gap: 1rem; }

/* ============================================================
   What's new
   ============================================================ */
.news { list-style: none; padding: 0; margin: 0; }
.news li {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 1rem;
  padding: 0.7rem 0;
  border-top: 1px solid var(--rule);
}
.news li:first-child { border-top: 0; padding-top: 0; }
.news time {
  color: var(--muted);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  padding-top: 0.1rem;
}

/* ============================================================
   Research
   ============================================================ */
.sub {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 500;
  font-style: italic;
  color: var(--muted);
  margin-bottom: 0.9rem;
}
.group + .sub { margin-top: 2.25rem; }
.group { display: grid; }

.paper {
  padding: 1rem 0;
  border-top: 1px solid var(--rule);
  display: grid;
  gap: 0.2rem;
}
.paper:first-child { border-top: 0; padding-top: 0; }

/* 1st paragraph: title (+ optional year span) */
.paper > p:first-child {
  font-family: var(--font-display);
  font-size: 1.28rem;
  font-weight: 500;
  line-height: 1.25;
}
.paper > p:first-child strong { font-weight: 500; }
.paper .yr {
  color: var(--faint);
  font-weight: 400;
  font-size: 0.85em;
  margin-left: 0.35em;
}

/* 2nd paragraph: authors */
.paper > p:nth-child(2) { font-size: 0.98rem; }

/* 3rd paragraph: venue / status */
.paper > p:nth-child(3) {
  font-size: 0.95rem;
  color: var(--muted);
  font-style: italic;
}
.paper > p:nth-child(3) em { font-style: italic; }

/* Paragraph holding the links */
.paper > p:has(a.paper-link) {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  font-size: 0.9rem;
  margin-top: 0.25rem;
  font-style: normal;
  color: var(--accent);
}
.paper-link { font-weight: 500; }

/* ============================================================
   Teaching
   ============================================================ */
.teach + .teach { margin-top: 1.75rem; }
.teach h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }
.teach h3 .role {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 400;
  margin-left: 0.4em;
}

.courses { list-style: none; margin: 0; padding: 0; }
.courses li {
  display: grid;
  grid-template-columns: 4.5rem 1fr auto;
  gap: 0.25rem 1rem;
  align-items: baseline;
  padding: 0.45rem 0;
  border-top: 1px solid var(--rule);
  font-size: 0.98rem;
}
.courses li.nonum { grid-template-columns: 1fr auto; }
.courses .num {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}
.courses .who { color: var(--muted); font-size: 0.9rem; }
.courses .meta {
  color: var(--muted);
  font-size: 0.85rem;
  white-space: nowrap;
  text-align: right;
}
.courses .meta b { font-weight: 500; color: var(--faint); margin-right: 0.6rem; }

/* ============================================================
   Footer: rule spans the full page like the top bar
   ============================================================ */
.footbar {
  margin-top: 5rem;
  border-top: 1px solid var(--rule);
  margin-inline: -16px;
  padding-inline: 16px;
}
.footbar .wrap { padding-block: 1.25rem 2.5rem; }
.footbar .copy { font-size: 0.85rem; color: var(--muted); }

/* ============================================================
   Mobile
   ============================================================ */
@media (max-width: 760px) {
  .brand { font-size: 1.05rem; white-space: nowrap; }
  .topnav { gap: 0.85rem; font-size: 0.82rem; }

  .intro {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding-block: 2rem;
  }
  .intro .photo { width: 150px; }

  #quarto-content section.level2 {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding-block: 2rem;
  }
  #quarto-content section.level2 > h2 { position: static; }

  .news li { grid-template-columns: 1fr; gap: 0.2rem; }

  .courses li { grid-template-columns: 4.5rem 1fr; }
  .courses li.nonum { grid-template-columns: 1fr; }
  .courses .meta { grid-column: 1 / -1; text-align: left; white-space: normal; }
}