:root {
  --bg: #1b1b1b;
  --bg-nav: #232320;
  --bg-panel: #232323;
  --text: #f3f3f1;
  --text-muted: #c7c7c4;
  --text-dim: #9a9a97;
  --border: #3a3a38;
  --accent: #6fa8dc;
  --pill-bg: #2c2c2a;
  --pill-border: #4a4a47;
  --max-width: 900px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Quicksand', 'Trebuchet MS', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 17px;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(111, 168, 220, 0.45);
  text-underline-offset: 3px;
}

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

/* Nav */
nav.site-nav {
  background: var(--bg-nav);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  padding: 1.1rem 2.5rem;
  gap: 1rem;
}

nav.site-nav .brand {
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
}

nav.site-nav .links {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

nav.site-nav .links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.98rem;
  padding-bottom: 4px;
}

nav.site-nav .links a.active {
  color: var(--accent);
  border-bottom: 2px solid var(--accent);
}

nav.site-nav .links a:hover {
  color: var(--text);
  border-bottom: 2px solid var(--text-dim);
}

/* Hero */
.hero {
  padding: 4.5rem 2.5rem 3rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
}

/* Main content wrapper for inner pages */
.wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 2.5rem 5rem;
}

.wrapper h1 {
  font-size: 2.4rem;
  font-weight: 700;
  margin: 0 0 2rem;
}

/* Home page bio layout */
.bio-grid {
  display: flex;
  gap: 3rem;
  align-items: flex-start;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 2.5rem 4rem;
  flex-wrap: nowrap;
}

.bio-photo {
  flex: 0 0 420px;
  width: 420px;
  height: 420px;
  border-radius: 8px;
  overflow: hidden;
  background: linear-gradient(135deg, #4a4038, #2c2622);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  font-weight: 700;
  color: var(--text-muted);
}

.bio-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
  display: block;
}

.bio-text {
  flex: 1 1 300px;
  min-width: 220px;
  text-align: justify;
}

.bio-text p {
  margin: 0 0 1.1rem;
}

.contact-block {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2.5rem 5rem;
}

.contact-block h2 {
  text-align: center;
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.contact-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.social-row {
  display: flex;
  gap: 1.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

/* Section headers on inner pages */
.wrapper h2 {
  font-size: 1.15rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin: 2.75rem 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.wrapper h2:first-of-type {
  margin-top: 0;
}

/* Quick jump sub-nav (research page) */
.section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  margin: 0 0 2.5rem;
}

.section-nav a {
  color: var(--accent);
  font-size: 0.92rem;
  text-decoration: underline;
  text-decoration-color: rgba(111, 168, 220, 0.4);
}

/* Compact paper list */
.paper-list {
  list-style: none;
  padding-left: 0;
  margin: 0.5rem 0 0;
}

.paper-list li {
  margin-bottom: 1.5rem;
  padding-left: 1.1rem;
  position: relative;
}

.paper-list li::before {
  content: "\2022";
  color: var(--accent);
  position: absolute;
  left: 0;
}

.paper-list .paper-title {
  font-weight: 600;
  line-height: 1.5;
}

.paper-list .meta {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin: 0.25rem 0 0;
}

/* Entries (papers, jobs, etc.) */
.entry {
  margin-bottom: 2.25rem;
}

.entry h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
}

.entry .meta {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0 0 0.6rem;
}

.entry p {
  margin: 0.5rem 0;
  text-align: justify;
}

.entry .tag {
  color: var(--text-dim);
  font-size: 0.88rem;
}

.abstract {
  margin: 0.6rem 0;
}

.abstract summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--accent);
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  text-decoration: none;
}

.abstract summary::-webkit-details-marker {
  display: none;
}

.abstract summary::before {
  content: "▸";
  font-size: 0.75rem;
  transition: transform 0.15s ease;
}

.abstract[open] summary::before {
  transform: rotate(90deg);
}

.abstract summary:hover {
  text-decoration: underline;
}

.abstract p {
  margin-top: 0.75rem;
  text-align: justify;
}

.abstract .tag {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0.6rem 0 0.9rem;
}

.pill-row a {
  background: var(--pill-bg);
  border: 1px solid var(--pill-border);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--text);
}

.pill-row a:hover {
  background: var(--pill-border);
}

.section-note {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-style: italic;
  margin: 0 0 0.4rem;
}

/* simple lists (teaching, policy) */
.wrapper ul {
  padding-left: 1.3rem;
  margin: 0.5rem 0 0;
}

.wrapper li {
  margin-bottom: 0.6rem;
}

.cv-preview {
  width: 100%;
  height: 80vh;
  min-height: 500px;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: #2a2a28;
}

.cv-preview iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.cv-download {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.7rem 1.4rem;
  background: var(--text);
  color: var(--bg);
  text-decoration: none;
  font-weight: 600;
  border-radius: 999px;
  font-size: 0.95rem;
}

.cv-download:hover {
  opacity: 0.85;
}

footer.site-footer {
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.85rem;
  text-align: center;
  padding: 1.5rem;
}

@media (max-width: 640px) {
  .hero h1 {
    font-size: 2.1rem;
  }
  nav.site-nav {
    padding: 1rem 1.25rem;
  }
  .wrapper, .hero, .bio-grid, .contact-block {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
  .bio-grid {
    flex-direction: column;
  }
  .bio-photo {
    width: 100%;
    height: auto;
    aspect-ratio: 1 / 1;
    flex-basis: auto;
  }
}