:root {
  --bg: #0c1526;
  --bg-2: #0f1e35;
  --bg-card: #111e33;
  --fg: #f0ebe3;
  --fg-muted: rgba(240, 235, 227, 0.55);
  --gold: #c8a96d;
  --gold-dim: rgba(200, 169, 109, 0.15);
  --border: rgba(200, 169, 109, 0.18);
  --border-strong: rgba(200, 169, 109, 0.3);
  --font-serif: 'Instrument Serif', Georgia, serif;
  --font-sans: 'Satoshi', 'Helvetica Neue', sans-serif;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* NAV */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 clamp(24px, 5vw, 80px);
  background: rgba(12, 21, 38, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--gold);
  letter-spacing: 0.01em;
}
.nav-tagline {
  font-size: 13px;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.15s;
}
.nav-link:hover { color: var(--gold); }

/* HERO */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px clamp(24px, 5vw, 80px) 80px;
  position: relative;
  background: radial-gradient(ellipse 80% 60% at 60% 40%, rgba(200, 169, 109, 0.06) 0%, transparent 70%);
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.hero-eyebrow {
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 24px;
  font-weight: 500;
}
.hero-headline {
  font-family: var(--font-serif);
  font-size: clamp(42px, 5.5vw, 72px);
  line-height: 1.08;
  color: var(--fg);
  margin-bottom: 28px;
  font-style: italic;
}
.hero-lede {
  font-size: 17px;
  line-height: 1.7;
  color: var(--fg-muted);
  max-width: 480px;
}

/* Orbit visual */
.hero-visual {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.orbit-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--border);
}
.ring-1 { width: 60%; height: 60%; }
.ring-2 { width: 80%; height: 80%; border-color: var(--border-strong); }
.ring-3 { width: 100%; height: 100%; border-color: var(--border); }
.orbit-core {
  position: absolute;
  width: 72px;
  height: 72px;
  background: var(--gold-dim);
  border: 1px solid var(--gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold);
}
.orbit-node {
  position: absolute;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 5px 9px;
  border-radius: 4px;
}
.n1 { top: 10%; left: 50%; transform: translateX(-50%); }
.n2 { top: 50%; right: 4%; transform: translateY(-50%); }
.n3 { bottom: 10%; left: 50%; transform: translateX(-50%); }
.n4 { top: 50%; left: 4%; transform: translateY(-50%); }

/* RAIL */
.rail {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 48px clamp(24px, 5vw, 80px);
}
.rail-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 0;
}
.rail-stat {
  text-align: center;
  padding: 0 24px;
}
.rail-value {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(28px, 3vw, 42px);
  color: var(--gold);
  font-style: italic;
  line-height: 1;
  margin-bottom: 8px;
}
.rail-label {
  font-size: 12px;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.rail-divider {
  width: 1px;
  height: 48px;
  background: var(--border);
}

/* AGENTS */
.agents {
  padding: 100px clamp(24px, 5vw, 80px);
}
.agents-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.section-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 20px;
  font-weight: 500;
}
.section-headline {
  font-family: var(--font-serif);
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.12;
  color: var(--fg);
  font-style: italic;
  margin-bottom: 64px;
}
.agents-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}
.agent-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 36px 32px;
  transition: border-color 0.2s;
}
.agent-card:hover {
  border-color: var(--gold);
}
.agent-icon {
  width: 40px;
  height: 40px;
  background: var(--gold-dim);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gold);
  margin-bottom: 20px;
}
.agent-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 12px;
  letter-spacing: 0.01em;
}
.agent-card p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--fg-muted);
}

/* CONTRAST */
.contrast {
  padding: 100px clamp(24px, 5vw, 80px);
  background: var(--bg-2);
  border-top: 1px solid var(--border);
}
.contrast-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}
.contrast-body {
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg-muted);
  margin-bottom: 20px;
}
.contrast-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
}
.comparison-side {
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
}
.comparison-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  display: block;
  margin-bottom: 20px;
  font-weight: 700;
}
.comparison-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.comparison-list li {
  font-size: 13px;
  line-height: 1.5;
  color: var(--fg-muted);
  padding-left: 16px;
  position: relative;
}
.comparison-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--gold);
}
.autonomous .comparison-list li { color: var(--fg); }
.autonomous .comparison-list li::before { background: var(--gold); }

/* CLOSING */
.closing {
  padding: 100px clamp(24px, 5vw, 80px);
}
.closing-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.closing-content {
  max-width: 700px;
}
.closing-headline {
  font-family: var(--font-serif);
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.1;
  color: var(--fg);
  font-style: italic;
  margin-bottom: 32px;
}
.closing-body {
  font-size: 17px;
  line-height: 1.75;
  color: var(--fg-muted);
  max-width: 560px;
}
.closing-rule {
  margin-top: 80px;
  height: 1px;
  background: var(--border);
}

/* FOOTER */
.footer {
  padding: 48px clamp(24px, 5vw, 80px);
  border-top: 1px solid var(--border);
}
.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: 16px;
}
.footer-logo {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--gold);
  font-style: italic;
}
.footer-domain {
  font-size: 13px;
  color: var(--fg-muted);
  font-family: monospace;
}
.footer-tagline {
  font-size: 13px;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
}

/* RESPONSIVE */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual { max-width: 320px; margin: 0 auto; }
  .agents-grid { grid-template-columns: 1fr 1fr; }
  .contrast-inner { grid-template-columns: 1fr; }
  .rail-inner { grid-template-columns: 1fr 1fr; gap: 32px; }
  .rail-divider { display: none; }
  .rail-stat { text-align: left; }
  .contrast-comparison { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .agents-grid { grid-template-columns: 1fr; }
  .rail-inner { grid-template-columns: 1fr 1fr; }
  .footer-inner { flex-direction: column; gap: 16px; }
}