:root {
  --bg-primary: #0d0f14;
  --bg-secondary: #13161e;
  --bg-card: #1a1e2a;
  --bg-card-hover: #1f2435;
  --accent: #6c8ebf;
  --accent-light: #8eaad4;
  --accent-glow: rgba(108, 142, 191, 0.15);
  --text-primary: #e8eaf0;
  --text-secondary: #9aa3b8;
  --text-muted: #5a637a;
  --border: #252a38;
  --border-accent: rgba(108, 142, 191, 0.3);
  --nav-height: 64px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(13, 15, 20, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
}

.nav-brand {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 0.4rem 0.85rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: 6px;
  transition: color 0.2s, background 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: var(--accent-glow);
}

.nav-links a.active { color: var(--accent-light); }

/* ── LAYOUT ── */
.page-wrapper {
  padding-top: var(--nav-height);
  min-height: 100vh;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── HERO (HOME) ── */
.hero {
  padding: 5rem 0 4rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: start;
}

.hero-text h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.hero-text .title {
  font-size: 1.05rem;
  color: var(--accent-light);
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.hero-text .affiliation {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.hero-text p {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 560px;
  margin-bottom: 1rem;
}

.hero-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.2rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-light); transform: translateY(-1px); }

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--border-accent);
  color: var(--text-primary);
  background: var(--accent-glow);
  transform: translateY(-1px);
}

.headshot-wrap {
  flex-shrink: 0;
}

.headshot {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--border-accent);
  box-shadow: 0 0 40px rgba(108, 142, 191, 0.12);
  display: block;
}

.headshot-placeholder {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 2px dashed var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-align: center;
  gap: 0.4rem;
}

/* ── SECTION HEADERS ── */
.section-header {
  padding: 4rem 0 2.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.section-header h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-header p {
  color: var(--text-secondary);
  margin-top: 0.5rem;
  font-size: 0.95rem;
}

.label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.75rem;
}

.label-accent { background: var(--accent-glow); color: var(--accent-light); border: 1px solid var(--border-accent); }
.label-muted { background: rgba(90, 99, 122, 0.15); color: var(--text-muted); border: 1px solid var(--border); }
.label-green { background: rgba(72, 187, 120, 0.1); color: #68d391; border: 1px solid rgba(72, 187, 120, 0.25); }

/* ── CARDS ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}

.card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.card-link {
  text-decoration: none;
  display: block;
  color: inherit;
}

/* ── GRID LAYOUTS ── */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 1rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

/* ── PROJECTS ── */
.projects-section { padding-bottom: 2rem; }

.projects-group-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin: 2.5rem 0 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.projects-group-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.project-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
}

.tag {
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-muted);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
}

/* ── PUBLICATIONS ── */
.scholar-banner {
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(108, 142, 191, 0.05) 100%);
  border: 1px solid var(--border-accent);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  margin-bottom: 2.5rem;
}

.scholar-banner h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.scholar-banner p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 1.25rem; }

.pub-list { display: flex; flex-direction: column; gap: 0.75rem; }

.pub-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  transition: border-color 0.2s, background 0.2s;
}

.pub-card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.pub-year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-light);
  font-weight: 600;
  min-width: 38px;
  padding-top: 0.15rem;
}

.pub-details { flex: 1; }
.pub-details .pub-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.3rem;
}

.pub-details .pub-authors {
  font-size: 0.83rem;
  color: var(--text-secondary);
  margin-bottom: 0.2rem;
}

.pub-details .pub-venue {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-style: italic;
}

.pub-details .pub-links {
  margin-top: 0.6rem;
  display: flex;
  gap: 0.5rem;
}

.pub-link {
  font-size: 0.75rem;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  background: var(--accent-glow);
  color: var(--accent-light);
  border: 1px solid var(--border-accent);
  text-decoration: none;
  font-weight: 500;
  transition: background 0.2s;
}
.pub-link:hover { background: rgba(108, 142, 191, 0.25); }

/* ── PEOPLE ── */
.person-card {
  text-align: center;
  padding: 1.75rem 1.25rem;
}

.person-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border-accent);
  margin: 0 auto 1rem;
  display: block;
}

.person-avatar-placeholder {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 2px dashed var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  font-size: 1.5rem;
  color: var(--text-muted);
}

.person-card h3 { font-size: 0.95rem; margin-bottom: 0.2rem; }
.person-card .person-role { font-size: 0.8rem; color: var(--accent-light); font-weight: 500; margin-bottom: 0.4rem; }
.person-card .person-topic { font-size: 0.8rem; color: var(--text-muted); line-height: 1.5; }
.person-card .person-year { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.35rem; font-family: var(--font-mono); }

/* ── CONTACT ── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 4rem;
}

.contact-info h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
}

.contact-icon {
  width: 36px;
  height: 36px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.95rem;
}

.contact-item-label { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 0.1rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.05em; }
.contact-item-value { font-size: 0.9rem; color: var(--text-primary); }
.contact-item-value a { color: var(--accent-light); text-decoration: none; }
.contact-item-value a:hover { text-decoration: underline; }

.contact-form { display: flex; flex-direction: column; gap: 1rem; }

.form-group { display: flex; flex-direction: column; gap: 0.4rem; }

label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

input, textarea {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 0.9rem;
  font-size: 0.9rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  transition: border-color 0.2s;
  width: 100%;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--border-accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

textarea { resize: vertical; min-height: 120px; }

/* ── DIVIDER ── */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ── RESPONSIVE ── */
@media (max-width: 680px) {
  .hero { grid-template-columns: 1fr; }
  .headshot-wrap { order: -1; }
  .headshot, .headshot-placeholder { width: 120px; height: 120px; }
  .contact-grid { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  nav { padding: 0 1rem; }
  .container { padding: 0 1.25rem; }
  .nav-links a { padding: 0.4rem 0.55rem; font-size: 0.8rem; }
}