/* ===== Basic, clean academic style ===== */
:root {
  --text: #222;
  --muted: #666;
  --accent: #800020;   /* burgundy */
  --bg: #fff;
  --line: #e5e5e5;
  --sans: Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

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

/* ----- Top navigation bar ----- */
header {
  border-bottom: 1px solid var(--line);
}
nav {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
nav .site-name {
  font-weight: bold;
  font-size: 20px;
  color: var(--accent);
}
nav .site-name:hover { text-decoration: none; }
nav ul {
  list-style: none;
  margin: 0 0 0 auto;   /* keep menu on the right, even without the name */
  padding: 0;
  display: flex;
  gap: 6px;
  font-family: var(--sans);
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
nav ul a {
  display: block;
  padding: 6px 14px;
  border-radius: 4px;
  color: var(--muted);
}
nav ul a:hover { color: var(--accent); text-decoration: none; }
/* Current page: filled box */
nav ul a.active, nav ul a.active:hover { background: var(--accent); color: #fff; }

/* ----- Main content ----- */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px 60px;
}

h1, h2 { color: var(--text); font-weight: normal; line-height: 1.25; }
h1 { font-size: 34px; margin: 0 0 28px; }
h2 { font-size: 24px; margin: 40px 0 16px; border-bottom: 1px solid var(--line); padding-bottom: 6px; }
main > h2:first-child, h1 + h2 { margin-top: 0; }

/* Home page: photo on the left, text on the right, tops aligned */
.intro {
  display: flex;
  gap: 40px;
  align-items: flex-start;
}
.intro .photo {
  flex: 0 0 220px;
  text-align: center;
}
.intro .photo img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 6px;
}
.intro .bio { flex: 1; }
.intro .bio p { margin: 0 0 16px; }
.intro .bio p:last-child { margin-bottom: 0; }

.links {
  margin-top: 12px;
  font-family: var(--sans);
  font-size: 15px;
  color: var(--muted);
}
.links a { margin: 0 6px; }

/* "Copied" note shown after clicking an email link */
.copied {
  margin-left: 6px;
  padding: 1px 6px;
  border-radius: 3px;
  background: var(--accent);
  color: #fff;
  font-family: var(--sans);
  font-size: 12px;
}

/* Stack photo above text on phones */
@media (max-width: 650px) {
  .intro { flex-direction: column; align-items: center; gap: 28px; }
  .intro .photo { flex-basis: auto; width: 220px; }
}

/* ----- Research / teaching entries ----- */
.entry { margin-bottom: 24px; }
.entry .title { font-weight: normal; }
.entry .details { color: var(--muted); font-size: 16px; }

/* [pdf] [abstract] links; the abstract drops down when [abstract] is clicked */
.paper-links {
  margin-top: 4px;
  display: flex;
  gap: 14px;
  font-family: var(--sans);
  font-size: 15px;
}
.paper-links .toggle {
  padding: 0;
  border: 0;
  background: none;
  font: inherit;
  color: var(--accent);
  cursor: pointer;
}
.paper-links .toggle:hover { text-decoration: underline; }
.entry .abstract {
  margin: 10px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--line);
  font-size: 16px;
  line-height: 1.55;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  padding: 20px;
  border-top: 1px solid var(--line);
}