:root {
  --bg: #0B1929;
  --bg-card: #0F2137;
  --bg-monitor: #0A1628;
  --fg: #E8F0F8;
  --fg-muted: #7A9BB5;
  --accent: #00E5C3;
  --accent-dim: rgba(0, 229, 195, 0.12);
  --border: rgba(255, 255, 255, 0.07);
  --serif: 'DM Serif Display', Georgia, serif;
  --sans: 'DM Sans', system-ui, sans-serif;
  --mono: 'DM Mono', 'Courier New', monospace;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Nav */
.nav {
  padding: 20px 48px;
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 16px;
}
.nav-logo {
  font-family: var(--serif);
  font-size: 22px;
  color: var(--fg);
  letter-spacing: -0.3px;
}
.nav-tag {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--accent);
  padding: 3px 8px;
  border-radius: 3px;
}

/* Hero */
.hero {
  padding: 80px 48px 64px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}
.hero-label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.hero-headline {
  font-family: var(--serif);
  font-size: clamp(36px, 5vw, 60px);
  line-height: 1.05;
  color: var(--fg);
  letter-spacing: -1px;
  margin-bottom: 24px;
}
.hero-lede {
  font-size: 18px;
  color: var(--fg-muted);
  line-height: 1.7;
  max-width: 480px;
}

/* Assay Monitor */
.hero-display {
  display: flex;
  justify-content: flex-end;
}
.assay-monitor {
  background: var(--bg-monitor);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  width: 100%;
  max-width: 380px;
}
.assay-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.assay-title {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.assay-badge {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 2px 7px;
  border-radius: 3px;
  letter-spacing: 0.08em;
}
.assay-data {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}
.assay-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 14px;
  background: var(--bg-card);
  border-radius: 6px;
}
.assay-label {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-muted);
  letter-spacing: 0.05em;
}
.assay-val {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg);
  font-weight: 500;
}
.assay-val.accent { color: var(--accent); }
.assay-val.pass { color: #34D399; }
.assay-ai-note {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--fg-muted);
  font-style: italic;
  padding: 10px 14px;
  background: var(--accent-dim);
  border-radius: 6px;
  border: 1px solid rgba(0, 229, 195, 0.15);
}
.ai-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* Monitor Strip */
.monitor {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 40px 48px;
}
.monitor-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0;
}
.monitor-stat {
  flex: 1;
  padding: 0 32px;
}
.monitor-stat:first-child { padding-left: 0; }
.monitor-stat:last-child { padding-right: 0; }
.monitor-div {
  width: 1px;
  height: 60px;
  background: var(--border);
}
.stat-num {
  display: block;
  font-family: var(--serif);
  font-size: 42px;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: -1px;
}
.stat-desc {
  font-size: 13px;
  color: var(--fg-muted);
  line-height: 1.5;
}

/* Section labels */
.section-label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section-title {
  font-family: var(--serif);
  font-size: clamp(28px, 3.5vw, 44px);
  color: var(--fg);
  letter-spacing: -0.5px;
  line-height: 1.15;
}

/* Features */
.features {
  padding: 80px 48px;
}
.features-header {
  max-width: 1200px;
  margin: 0 auto 56px;
}
.features-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.feature-card {
  background: var(--bg);
  padding: 36px 40px;
  transition: background 0.2s;
}
.feature-card:hover { background: var(--bg-card); }
.feature-icon {
  color: var(--accent);
  margin-bottom: 20px;
}
.feature-card h3 {
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 12px;
}
.feature-card p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* How */
.how {
  padding: 80px 48px;
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.how-header {
  max-width: 1200px;
  margin: 0 auto 56px;
}
.how-flow {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: start;
  gap: 0;
}
.flow-step {
  padding: 0 24px;
}
.flow-step:first-child { padding-left: 0; }
.flow-step:last-child { padding-right: 0; }
.step-num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 12px;
}
.step-body h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 8px;
}
.step-body p {
  font-size: 13px;
  color: var(--fg-muted);
  line-height: 1.6;
}
.flow-arrow {
  width: 32px;
  height: 1px;
  background: var(--border);
  margin-top: 30px;
  flex-shrink: 0;
  position: relative;
}
.flow-arrow::after {
  content: '';
  position: absolute;
  right: 0;
  top: -3px;
  width: 0;
  height: 0;
  border-left: 6px solid var(--border);
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
}

/* Closing */
.closing {
  padding: 80px 48px 100px;
}
.closing-inner {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}
.closing-quote {
  font-family: var(--serif);
  font-size: clamp(22px, 3vw, 32px);
  color: var(--fg);
  line-height: 1.4;
  margin-bottom: 16px;
  letter-spacing: -0.3px;
}
.closing-attribution {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--fg-muted);
  letter-spacing: 0.06em;
  margin-bottom: 40px;
}
.closing-body {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.8;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 48px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer-brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.footer-logo {
  font-family: var(--serif);
  font-size: 20px;
  color: var(--fg);
}
.footer-tagline {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-muted);
  letter-spacing: 0.06em;
}
.footer-note {
  font-size: 13px;
  color: var(--fg-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .nav, .hero, .monitor, .features, .how, .closing, .footer {
    padding-left: 24px;
    padding-right: 24px;
  }
  .hero { padding-top: 48px; padding-bottom: 48px; }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-display { justify-content: flex-start; }
  .monitor-inner { flex-direction: column; gap: 24px; }
  .monitor-stat { padding: 0; }
  .monitor-div { display: none; }
  .features-grid { grid-template-columns: 1fr; }
  .how-flow { grid-template-columns: 1fr; gap: 24px; }
  .flow-arrow { display: none; }
  .footer-inner { flex-direction: column; gap: 12px; text-align: center; }
}