:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #55606b;
  --accent: #00539b;       /* Duke blue */
  --accent-hover: #003d73;
  --rule: #e2e6ea;
  --code-bg: #f2f4f6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181c;
    --fg: #e6e9ec;
    --muted: #9aa5b0;
    --accent: #7db8e8;
    --accent-hover: #a8d0f0;
    --rule: #2a3138;
    --code-bg: #1f262c;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  max-width: 44rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
}

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

a:hover,
a:focus {
  color: var(--accent-hover);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}

/* Header */

.profile-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(96px, 24vw, 160px);
  align-items: center;
  gap: 0.75rem 1.5rem;
  margin-bottom: 1.25rem;
}

.profile-photo {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  border-radius: 0.5rem;
  object-fit: cover;
  object-position: 25% 65%;
}

.profile-info {
  min-width: 0;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 2rem;
  letter-spacing: -0.01em;
}

.tagline {
  margin: 0;
  color: var(--muted);
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  padding: 0.6rem 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  font-size: 0.95rem;
}

.contact-line {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 0.95rem;
  color: var(--muted);
}

/* Sections */

section {
  margin-top: 2.75rem;
}

h2 {
  margin: 0 0 1rem;
  font-size: 1.3rem;
  letter-spacing: -0.01em;
}

h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

#research article + article {
  margin-top: 1.5rem;
}

#research p {
  margin: 0;
}

.research-tools {
  color: var(--muted);
  font-size: 0.95rem;
}

.education {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Publications, talks */

.pub-list,
.talk-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.pub-list li,
.talk-list li {
  margin-bottom: 1.25rem;
}

.pub-title {
  font-weight: 600;
}

.authors {
  color: var(--muted);
}

.venue {
  color: var(--muted);
  font-style: italic;
}

.links a {
  margin-left: 0.6rem;
  font-size: 0.9rem;
}

/* Software */

.project-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.project-list li {
  margin-bottom: 1.5rem;
}

.project-list h3 {
  margin: 0 0 0.3rem;
  font-size: 1.05rem;
}

.project-list p {
  margin: 0;
  color: var(--muted);
}

.lang {
  margin-left: 0.5rem;
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--muted);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.05rem 0.55rem;
  vertical-align: 0.1em;
}

/* Teaching */

.dated-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.dated-list li {
  display: grid;
  grid-template-columns: 10.75rem minmax(0, 1fr);
  gap: 0.25rem 1rem;
  margin-bottom: 1rem;
}

.when {
  color: var(--muted);
  font-size: 0.95rem;
}

/* Footer */

footer {
  margin-top: 3.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-size: 0.95rem;
  color: var(--muted);
}

@media (max-width: 480px) {
  .profile-header {
    gap: 0.75rem 1rem;
  }

  body {
    font-size: 1rem;
    padding-top: 1.75rem;
  }

  .dated-list li {
    display: block;
  }

  .when {
    display: block;
    margin-bottom: 0.25rem;
  }
}