:root {
  --bg: #0B0E14;
  --bg-raised: #11151F;
  --text: #E8EAED;
  --text-dim: #8B93A3;
  --accent: #4DD8E8;
  --accent-dim: #2A5A63;
  --border: #1E2330;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 32px;
}

a { color: inherit; text-decoration: none; }

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

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 14, 20, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.logo-dot { color: var(--accent); }

.nav { display: flex; gap: 36px; }

.nav a {
  font-size: 0.92rem;
  color: var(--text-dim);
  transition: color 0.2s ease;
}

.nav a:hover, .nav a.active { color: var(--text); }

/* Hero */
.hero {
  position: relative;
  padding: 120px 0 100px;
  overflow: hidden;
}

#wave {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 220px;
  opacity: 0.35;
  pointer-events: none;
}

.hero-inner { position: relative; z-index: 1; max-width: 760px; }

.hero h1 {
  font-size: 3.4rem;
  line-height: 1.08;
  margin-bottom: 28px;
}

.hero-sub {
  font-size: 1.08rem;
  color: var(--text-dim);
  max-width: 600px;
  margin-bottom: 36px;
}

.hero-actions { display: flex; gap: 16px; }

.btn {
  display: inline-flex;
  align-items: center;
  padding: 13px 26px;
  border-radius: 6px;
  font-size: 0.92rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--accent);
  color: #06141A;
}

.btn-primary:hover { background: #6ee3f0; }

.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-ghost:hover { border-color: var(--accent-dim); }

/* Stat strip */
.strip {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-raised);
}

.strip-inner {
  display: flex;
  gap: 64px;
  padding: 36px 32px;
}

.stat { display: flex; flex-direction: column; gap: 4px; }

.stat-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
}

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

/* Areas */
.areas { padding: 110px 0; }

.areas h2 {
  font-size: 2.1rem;
  max-width: 560px;
  margin-bottom: 56px;
}

.area-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.area-card {
  padding: 32px 26px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: border-color 0.2s ease;
}

.area-card:hover { border-color: var(--accent-dim); }

.area-mark {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--accent);
  margin-bottom: 18px;
}

.area-card h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.area-card p {
  font-size: 0.92rem;
  color: var(--text-dim);
}

/* Quote */
.quote {
  padding: 90px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.quote blockquote {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 500;
  line-height: 1.45;
  max-width: 720px;
  color: var(--text);
}

.quote-attr {
  margin-top: 20px;
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* Contact */
.contact { padding: 110px 0; }

.contact-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 40px;
  flex-wrap: wrap;
}

.contact h2 { font-size: 2rem; margin: 6px 0 10px; }

.contact-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: right;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* Page hero (about) */
.page-hero {
  padding: 110px 0 80px;
  border-bottom: 1px solid var(--border);
}

.page-hero h1 {
  font-size: 2.6rem;
  line-height: 1.12;
  max-width: 680px;
  margin-bottom: 26px;
}

/* Papers */
.papers { padding: 90px 0; }

.paper-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.paper {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 28px;
  padding: 30px 0;
  border-bottom: 1px solid var(--border);
}

.paper-date { padding-top: 4px; }

.paper h3 {
  font-size: 1.08rem;
  font-weight: 600;
  margin-bottom: 8px;
  max-width: 580px;
}

.paper p {
  font-size: 0.92rem;
  color: var(--text-dim);
  max-width: 580px;
}

/* Team */
.team {
  padding: 90px 0;
  background: var(--bg-raised);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.team-card {
  padding: 26px 20px;
  border: 1px solid var(--border);
  border-radius: 10px;
}

.team-initial {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: 20px;
  padding: 4px 12px;
  margin-bottom: 16px;
}

.team-card h4 {
  font-size: 0.98rem;
  margin-bottom: 6px;
}

/* Note */
.note { padding: 100px 0; }

.note-inner { max-width: 680px; }

.note .hero-sub { font-size: 1rem; }

/* Responsive */
@media (max-width: 880px) {
  .hero h1 { font-size: 2.3rem; }
  .area-grid { grid-template-columns: 1fr; }
  .team-grid { grid-template-columns: repeat(2, 1fr); }
  .strip-inner { gap: 36px; flex-wrap: wrap; }
  .paper { grid-template-columns: 1fr; gap: 8px; }
  .contact-inner { align-items: flex-start; }
  .contact-block { text-align: left; }
}

@media (max-width: 560px) {
  .nav { gap: 20px; }
  .hero { padding: 90px 0 70px; }
  .hero h1 { font-size: 1.9rem; }
  .team-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}