/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #fafafa;
  --bg-elevated: #ffffff;
  --border: #e4e4e4;
  --text: #1a1a1a;
  --text-secondary: #555555;
  --text-dim: #999999;
  --mono: 'IBM Plex Mono', monospace;
  --sans: 'Inter', -apple-system, sans-serif;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

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

a:hover {
  color: #000000;
}

em {
  font-style: italic;
  color: #000000;
}

strong {
  font-weight: 500;
  color: #000000;
}

::selection {
  background: rgba(0, 0, 0, 0.08);
}

/* ===== Canvas Background ===== */
#grid-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  opacity: 0.35;
}

/* ===== Navigation ===== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text);
}

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

.nav-links a {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
  text-transform: lowercase;
}

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

/* ===== Main Content ===== */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ===== Hero ===== */
.hero {
  padding: 11rem 0 4rem;
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.hero-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: 1.8rem;
}

.hero h1 {
  font-family: var(--sans);
  font-size: clamp(2.6rem, 5.5vw, 4.2rem);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: -0.03em;
  color: #000000;
}

/* ===== Central Paragraph (AMI-style) ===== */
.central-paragraph {
  max-width: 640px;
  margin: 0 auto;
  padding: 4rem 0 5rem;
}

.central-paragraph p {
  font-size: 1.08rem;
  line-height: 1.9;
  color: var(--text-secondary);
  margin-bottom: 1.6rem;
}

.central-paragraph p:last-child {
  margin-bottom: 0;
}

/* ===== Divider ===== */
.divider {
  height: 1px;
  background: var(--border);
  margin: 0;
}

/* ===== Section Grid (2-column layout) ===== */
.section-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 4rem;
  padding: 5rem 0;
}

.section-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding-top: 0.3rem;
}

.section-content p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  max-width: 650px;
}

.section-content p:last-child {
  margin-bottom: 0;
}

/* ===== Research ===== */
.research {
  padding: 5rem 0;
}

.research > .section-label {
  margin-bottom: 3rem;
}

.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  margin-top: 3rem;
}

.research-card {
  background: var(--bg);
  padding: 2.5rem;
  transition: background 0.3s;
}

.research-card:hover {
  background: var(--bg-elevated);
}

.card-number {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 0.15em;
  margin-bottom: 1.2rem;
}

.research-card h3 {
  font-family: var(--sans);
  font-size: 1.15rem;
  font-weight: 500;
  color: #000000;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.research-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Team ===== */
.team-intro {
  margin-bottom: 2.5rem !important;
}

.team-cta {
  border: 1px solid var(--border);
  padding: 2rem;
  border-radius: 2px;
}

.team-cta p {
  margin-bottom: 1rem !important;
}

.link-arrow {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text) !important;
  letter-spacing: 0.02em;
  transition: letter-spacing 0.3s, color 0.2s;
}

.link-arrow:hover {
  letter-spacing: 0.06em;
  color: #000000 !important;
}

/* ===== Footer ===== */
footer {
  margin-top: 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  padding: 3rem 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.footer-logo {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}

.footer-loc {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}

.footer-links {
  display: flex;
  gap: 2rem;
}

.footer-links a {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
}

.footer-links a:hover {
  color: var(--text);
}

.footer-copy {
  width: 100%;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 1rem;
  letter-spacing: 0.03em;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-inner {
    padding: 1rem 1.5rem;
  }

  .nav-links {
    gap: 1.2rem;
  }

  .nav-links a {
    font-size: 0.72rem;
  }

  main {
    padding: 0 1.5rem;
  }

  .hero {
    padding: 9rem 0 3rem;
  }

  .central-paragraph {
    padding: 3rem 0 4rem;
  }

  .section-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 3.5rem 0;
  }

  .research {
    padding: 3.5rem 0;
  }

  .research-grid {
    grid-template-columns: 1fr;
    margin-top: 2rem;
  }

  .footer-inner {
    flex-direction: column;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: 1.2rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2.2rem;
  }

  .nav-links {
    gap: 0.8rem;
  }

  .research-card {
    padding: 1.8rem;
  }
}

/* ===== Animations ===== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll-triggered fade-in */
.animate {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.animate.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered children (research cards) */
.research-card.animate { transition-delay: 0s; }
.research-card.animate:nth-child(2) { transition-delay: 0.08s; }
.research-card.animate:nth-child(3) { transition-delay: 0.16s; }
.research-card.animate:nth-child(4) { transition-delay: 0.24s; }

/* Hero loads immediately */
.hero {
  animation: fadeUp 0.8s ease-out both;
}

.central-paragraph {
  animation: fadeUp 0.8s ease-out 0.15s both;
}

/* Subtle line grow on dividers */
.divider {
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.8s ease;
}

.divider.visible {
  transform: scaleX(1);
}