:root {
  --ink: #0D1013;
  --surface: #12161C;
  --surface-raised: #161B22;
  --line: #262C34;
  --muted: #8D96A3;
  --paper: #ECEFF3;
  --signal: #F2A83D;
  --signal-dim: #a97a34;
  --font-display: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max: 760px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

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

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
}

/* Header */
header.site {
  position: relative;
  z-index: 10;
  padding-top: clamp(1.5rem, 3vw, 2.25rem);
}

.site-bar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--paper);
}

.brand .dot { color: var(--signal); }

nav.primary {
  display: flex;
  gap: clamp(1rem, 2.5vw, 1.75rem);
  font-family: var(--font-display);
  font-size: 0.85rem;
}

nav.primary a {
  text-decoration: none;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.15s ease, border-color 0.15s ease;
}

nav.primary a:hover { color: var(--paper); border-color: var(--line); }

.affiliation-tag {
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--muted);
}

/* Hero */
.hero {
  padding: clamp(3rem, 9vw, 6.5rem) 0 clamp(2.5rem, 6vw, 4rem);
  position: relative;
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.35rem, 5.6vw, 4.1rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0 0 1.5rem;
  max-width: 14ch;
}

.hero .lede {
  max-width: 62ch;
  font-size: 1.15rem;
  color: #cbd1da;
  margin: 0 0 2.75rem;
}

.hero .lede strong { color: var(--paper); font-weight: 600; }

.spectrum {
  width: 100%;
  height: clamp(90px, 16vw, 150px);
  display: block;
}

.spectrum-caption {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 0.6rem;
  max-width: 100%;
}

/* Section scaffolding */
section {
  padding: clamp(3rem, 7vw, 5rem) 0;
  border-top: 1px solid var(--line);
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2rem;
  justify-content: space-between;
}

.section-head h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.4rem, 2.6vw, 1.85rem);
  margin: 0;
  color: var(--paper);
}

.section-head .index {
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--signal-dim);
  white-space: nowrap;
}

/* Focus section */
.focus p.lead {
  max-width: var(--max);
  font-size: 1.08rem;
  color: #d3d8de;
  margin: 0 0 2.25rem;
}

.capability-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  max-width: 900px;
}

.capability-list dl {
  margin: 0;
  padding: 1.1rem 1.25rem 1.1rem 0;
  border-bottom: 1px solid var(--line);
}

.capability-list dt {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--signal);
  margin-bottom: 0.4rem;
}

.capability-list dd {
  margin: 0;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.55;
}

/* Research areas */
.area-row {
  display: grid;
  grid-template-columns: minmax(180px, 260px) 1fr;
  gap: 1.5rem 2.5rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--line);
}

.area-row:first-of-type { border-top: 1px solid var(--line); }

.area-row h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.1rem;
  margin: 0;
  color: var(--paper);
}

.area-row p {
  margin: 0;
  max-width: 58ch;
  color: #c7cdd5;
}

@media (max-width: 640px) {
  .area-row { grid-template-columns: 1fr; gap: 0.6rem; }
}

/* People */
.pi-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.75rem;
  align-items: start;
  max-width: 720px;
}

.pi-mark {
  width: 68px;
  height: 68px;
  flex-shrink: 0;
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--signal);
  background: var(--surface);
}

.pi-info h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.2rem;
  margin: 0 0 0.15rem;
  color: var(--paper);
}

.pi-role {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0 0 0.9rem;
}

.pi-info p.bio {
  margin: 0 0 0.9rem;
  color: #c7cdd5;
  max-width: 54ch;
}

.pi-contact {
  font-family: var(--font-display);
  font-size: 0.9rem;
}

.pi-contact a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid var(--signal-dim);
}

.pi-contact a:hover { color: var(--paper); border-color: var(--paper); }

.team-note {
  margin: 2.25rem 0 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  max-width: 58ch;
  font-size: 0.92rem;
  color: var(--muted);
}

/* Contact / involve */
.contact-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 3rem;
}

.contact-grid p.lead {
  max-width: 48ch;
  color: #d3d8de;
  margin: 0;
}

.contact-details {
  font-family: var(--font-display);
  font-size: 0.92rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  color: var(--muted);
}

.contact-details a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.contact-details a:hover { border-color: var(--signal); color: var(--signal); }

@media (max-width: 640px) {
  .contact-grid { grid-template-columns: 1fr; gap: 1.75rem; }
}

/* Footer */
footer.site {
  border-top: 1px solid var(--line);
  padding: 2rem 0 2.5rem;
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

footer.site a { color: var(--muted); text-decoration: none; }
footer.site a:hover { color: var(--paper); }