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

:root {
  --sky:       #0c1929;
  --sky-mid:   #132740;
  --sky-light: #1a3355;
  --slate:     #8b9fc2;
  --cloud:     #c8d6e8;
  --white:     #e8eef6;
  --accent:    #4a9eff;
  --accent-dim:#2d6bb5;
  --green:     #34d399;
  --amber:     #f59e0b;
  --rose:      #f472b6;
  --radius:    8px;
}

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--sky);
  color: var(--cloud);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Nav ──────────────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(12, 25, 41, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(74, 158, 255, 0.1);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--white);
  letter-spacing: 0.02em;
}

.logo-icon {
  color: var(--accent);
  margin-right: 0.4rem;
  font-size: 1.2em;
}

.nav-contact {
  color: var(--slate);
  text-decoration: none;
  font-size: 0.85rem;
  font-family: 'JetBrains Mono', monospace;
  transition: color 0.2s;
}
.nav-contact:hover { color: var(--accent); }

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  padding: 10rem 2rem 5rem;
  text-align: center;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(74, 158, 255, 0.08) 0%, transparent 60%),
    linear-gradient(180deg, var(--sky) 0%, var(--sky-mid) 100%);
}

.hero-inner {
  max-width: 720px;
  margin: 0 auto;
}

.hero-tag {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  border: 1px solid rgba(74, 158, 255, 0.3);
  padding: 0.3rem 1rem;
  border-radius: 20px;
  margin-bottom: 1.5rem;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 600;
  color: var(--white);
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 1.1rem;
  color: var(--slate);
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.7;
  font-weight: 300;
}

/* ── Metrics ──────────────────────────────────────────────── */
.metrics {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 2.5rem;
  padding: 3rem 2rem;
  background: var(--sky-mid);
  border-top: 1px solid rgba(74, 158, 255, 0.08);
  border-bottom: 1px solid rgba(74, 158, 255, 0.08);
}

.metric {
  text-align: center;
}

.metric-num {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.8rem;
  font-weight: 500;
  color: var(--white);
  letter-spacing: -0.02em;
}

.metric-label {
  font-size: 0.8rem;
  color: var(--slate);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 0.25rem;
  display: block;
}

.metric-divider {
  width: 1px;
  height: 40px;
  background: rgba(74, 158, 255, 0.15);
}

/* ── Research ─────────────────────────────────────────────── */
.research {
  max-width: 1100px;
  margin: 0 auto;
  padding: 5rem 2rem;
}

.research h2, .stations h2 {
  font-size: 1.6rem;
  font-weight: 500;
  color: var(--white);
  text-align: center;
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-top: 2.5rem;
}

.card {
  background: var(--sky-mid);
  border: 1px solid rgba(74, 158, 255, 0.1);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color 0.25s, transform 0.25s;
}
.card:hover {
  border-color: rgba(74, 158, 255, 0.25);
  transform: translateY(-2px);
}

.card-icon {
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.card h3 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--white);
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.88rem;
  color: var(--slate);
  line-height: 1.6;
}

/* ── Stations ─────────────────────────────────────────────── */
.stations {
  padding: 4rem 2rem 5rem;
  text-align: center;
  background: linear-gradient(180deg, var(--sky) 0%, var(--sky-mid) 100%);
  border-top: 1px solid rgba(74, 158, 255, 0.08);
}

.stations-sub {
  color: var(--slate);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

.station-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  max-width: 800px;
  margin: 0 auto;
}

.tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  padding: 0.35rem 0.75rem;
  border-radius: 4px;
  border: 1px solid;
  letter-spacing: 0.04em;
}

.tag-et  { color: #60a5fa; border-color: rgba(96, 165, 250, 0.3);  background: rgba(96, 165, 250, 0.08); }
.tag-ct  { color: #34d399; border-color: rgba(52, 211, 153, 0.3);  background: rgba(52, 211, 153, 0.08); }
.tag-mt  { color: #fbbf24; border-color: rgba(251, 191, 36, 0.3);  background: rgba(251, 191, 36, 0.08); }
.tag-mst { color: #f87171; border-color: rgba(248, 113, 113, 0.3); background: rgba(248, 113, 113, 0.08); }
.tag-pt  { color: #a78bfa; border-color: rgba(167, 139, 250, 0.3); background: rgba(167, 139, 250, 0.08); }

/* ── Footer ───────────────────────────────────────────────── */
footer {
  border-top: 1px solid rgba(74, 158, 255, 0.08);
  background: var(--sky);
  padding: 1.5rem 2rem;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--slate);
}

.footer-left {
  font-weight: 500;
  color: var(--cloud);
}

.footer-right a {
  color: var(--slate);
  text-decoration: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
}
.footer-right a:hover { color: var(--accent); }

.footer-sep {
  margin: 0 0.5rem;
  opacity: 0.4;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 768px) {
  .hero { padding: 8rem 1.5rem 3.5rem; }
  .metrics { flex-wrap: wrap; gap: 1.5rem; }
  .metric-divider { display: none; }
  .nav-contact { display: none; }
  .footer-inner { flex-direction: column; gap: 0.5rem; text-align: center; }
}