:root {
  --text: #222;
  --muted: #666;
  --accent: #1a4d8f;
  --rule: #e2e2e2;
  --bg: #fff;
  --max-width: 1250px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.site-header, .site-main, .site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
}
.site-name {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: bold;
  color: var(--text);
}
.site-logo { height: 34px; width: auto; }
.site-nav a { margin-left: 1.25rem; }

/* Headshot left, bio right */
.intro {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
  padding: 2.5rem 0 2rem;
}
.headshot {
  flex: 0 0 340px;
  width: 340px;
  height: auto;
  border-radius: 6px;
  margin-top: 13px; /* align top edge with the cap height of the h1, not its line box */
}
.bio h1 { margin: 0 0 0.25rem; font-size: 2rem; }
.bio .role { margin: 0 0 1rem; color: var(--muted); }
.bio .contact { margin-bottom: 0.25rem; }
.bio .links a { margin-right: 1.25rem; }

/* Papers */
.papers h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.4rem;
}
.group-title {
  font-size: 1.15rem;
  margin: 2rem 0 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.paper { margin-bottom: 1.75rem; }
.paper-title { margin: 0 0 0.2rem; font-size: 1.15rem; }
.paper-note { font-weight: normal; color: var(--muted); font-size: 1rem; }
.paper-meta, .paper-links { margin: 0 0 0.3rem; color: var(--muted); }
.paper-links a { margin: 0 0.25rem; }
.coauthor {
  color: inherit;
  text-decoration: underline dotted;
  text-decoration-color: #b8b8b8;
  text-underline-offset: 3px;
}
.coauthor:hover { text-decoration: underline solid; text-decoration-color: var(--muted); }
.paper-links a:first-child { margin-left: 0; }

/* Accordion abstract (native <details>, no JS) */
.abstract summary {
  cursor: pointer;
  color: var(--accent);
  user-select: none;
}
.abstract summary:hover { text-decoration: underline; }
.abstract p {
  margin: 0.5rem 0 0;
  padding-left: 1rem;
  border-left: 3px solid var(--rule);
}

.site-footer {
  margin-top: 3rem;
  padding-top: 1rem;
  padding-bottom: 2rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.85rem;
}

/* Stack headshot above bio on narrow screens */
@media (max-width: 640px) {
  .intro { flex-direction: column; gap: 1.25rem; }
  .headshot { width: 220px; flex-basis: auto; }
}