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

:root {
  --bg: #0b0b0f;
  --bg-alt: #101018;
  --surface: #16161e;
  --text: #e0e0e6;
  --text-muted: #8888a0;
  --accent: #6e8efb;
  --accent-dim: rgba(110, 142, 251, 0.12);
  --border: #1e1e2a;
  --radius: 8px;
  --max-width: 960px;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.8;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Nav ── */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  background: rgba(11, 11, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text);
  opacity: 1;
}

/* ── Hero ── */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 24px;
}

.hero-content {
  max-width: 640px;
}

.hero-tag {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(56px, 10vw, 96px);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 24px;
  color: var(--text);
}

.hero h1 .accent {
  color: var(--accent);
}

.hero-sub {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 480px;
  margin: 0 auto;
}

/* ── Sections ── */

.section {
  padding: 96px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section h2 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 40px;
}

.section-intro {
  color: var(--text-muted);
  margin-bottom: 32px;
  font-size: 15px;
}

/* ── About ── */

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
  font-size: 15px;
  line-height: 1.75;
}

.about-text a {
  font-weight: 500;
}

.about-focus h3 {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text);
  margin-bottom: 16px;
}

.about-focus ul {
  list-style: none;
}

.about-focus li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 14px;
}

.about-focus li:first-child {
  border-top: 1px solid var(--border);
}

/* ── Research ── */

.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.research-card {
  display: block;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  transition: border-color 0.2s, background 0.2s;
}

.research-card:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
  opacity: 1;
}

.research-date {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.research-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 8px 0 6px;
  letter-spacing: -0.01em;
}

.research-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Contact ── */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-info p {
  color: var(--text-muted);
  font-size: 15px;
  margin-bottom: 24px;
  line-height: 1.7;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-link {
  display: block;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 15px;
  transition: border-color 0.2s;
}

.contact-link:hover {
  border-color: var(--accent);
  opacity: 1;
}

.contact-label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.contact-social {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.contact-social a {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.contact-social a:first-child {
  border-top: 1px solid var(--border);
}

.contact-social a:hover {
  color: var(--text);
  opacity: 1;
}

/* ── Footer ── */

.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

.footer p {
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* ── Responsive ── */

@media (max-width: 680px) {
  .nav {
    padding: 14px 20px;
  }

  .nav-links {
    gap: 20px;
  }

  .nav-links a {
    font-size: 13px;
  }

  .hero {
    min-height: 80vh;
    padding: 60px 20px;
  }

  .hero-sub {
    font-size: 16px;
  }

  .section {
    padding: 64px 0;
  }

  .section h2 {
    font-size: 26px;
    margin-bottom: 28px;
  }

  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .research-grid {
    grid-template-columns: 1fr;
  }
}