:root {
  --bg: #0e1f14;
  --bg-mid: #142318;
  --bg-light: #1a3022;
  --fg: #e8f0ea;
  --fg-muted: #7a9e87;
  --accent: #f5a623;
  --accent-dim: rgba(245, 166, 35, 0.12);
  --border: rgba(122, 158, 135, 0.18);
  --serif: 'Source Serif 4', Georgia, serif;
  --sans: 'DM Sans', system-ui, sans-serif;
}

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

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

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: rgba(14, 31, 20, 0.92);
  backdrop-filter: blur(12px);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.nav-logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: var(--fg);
}
.nav-tagline {
  font-size: 13px;
  color: var(--fg-muted);
  letter-spacing: 0.3px;
}

/* Section shared */
.section-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.section-heading {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.5px;
  color: var(--fg);
}

/* Hero */
.hero {
  padding: 96px 32px 80px;
  background: linear-gradient(160deg, var(--bg-mid) 0%, var(--bg) 60%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 60% at 70% 40%, rgba(245,166,35,0.07) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner {
  max-width: 740px;
  position: relative;
}
.hero-eyebrow {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.hero-headline {
  font-size: clamp(40px, 6vw, 68px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -1.5px;
  color: var(--fg);
  margin-bottom: 24px;
}
.hero-sub {
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.6;
  color: var(--fg-muted);
  max-width: 520px;
  margin-bottom: 48px;
}
.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
}
.stat { display: flex; flex-direction: column; gap: 4px; }
.stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.5px;
}
.stat-label {
  font-size: 12px;
  color: var(--fg-muted);
  letter-spacing: 0.5px;
}
.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* How it works */
.how-it-works {
  padding: 96px 32px;
  background: var(--bg-mid);
  border-top: 1px solid var(--border);
}
.how-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.how-inner .section-heading {
  margin-bottom: 56px;
}
.step-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--border);
}
.step {
  padding: 40px;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.step:nth-child(2n) { border-right: none; }
.step:nth-child(3), .step:nth-child(4) { border-bottom: none; }
.step-num {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 3px 8px;
  border-radius: 3px;
  margin-bottom: 16px;
}
.step-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 10px;
  letter-spacing: -0.2px;
}
.step-desc {
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.65;
  color: var(--fg-muted);
}

/* Why agents */
.why-agents {
  padding: 96px 32px;
  background: var(--bg);
  border-top: 1px solid var(--border);
}
.why-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.why-body {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.7;
  color: var(--fg-muted);
  margin-bottom: 18px;
}
.why-body:last-child { margin-bottom: 0; }
.why-comparison {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.compare-row {
  padding: 24px 28px;
  border-radius: 8px;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.compare-old {
  background: rgba(122, 158, 135, 0.06);
}
.compare-new {
  background: var(--accent-dim);
  border-color: rgba(245, 166, 35, 0.3);
}
.compare-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.compare-old .compare-label { color: var(--fg-muted); }
.compare-new .compare-label { color: var(--accent); }
.compare-val {
  font-size: 15px;
  font-weight: 500;
  color: var(--fg);
}

/* Principles */
.principles {
  padding: 96px 32px;
  background: var(--bg-light);
  border-top: 1px solid var(--border);
}
.principles-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.principles-inner .section-label { margin-bottom: 16px; }
.principles-inner .section-heading { margin-bottom: 48px; }
.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.principle {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.principle-icon {
  width: 44px;
  height: 44px;
  background: var(--accent-dim);
  border: 1px solid rgba(245, 166, 35, 0.2);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}
.principle-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: -0.2px;
}
.principle-desc {
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.65;
  color: var(--fg-muted);
}

/* Closing */
.closing {
  padding: 100px 32px;
  background: var(--bg);
  border-top: 1px solid var(--border);
  text-align: center;
}
.closing-inner {
  max-width: 680px;
  margin: 0 auto;
}
.closing-headline {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.8px;
  color: var(--fg);
  margin-bottom: 20px;
}
.closing-sub {
  font-family: var(--serif);
  font-size: 19px;
  color: var(--fg-muted);
  font-style: italic;
}

/* Footer */
.footer {
  padding: 32px;
  border-top: 1px solid var(--border);
  background: var(--bg-mid);
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  gap: 16px;
}
.footer-brand {
  font-size: 15px;
  font-weight: 700;
  color: var(--fg);
}
.footer-copy {
  font-size: 13px;
  color: var(--fg-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .hero { padding: 72px 24px 60px; }
  .how-it-works, .why-agents, .principles, .closing { padding: 64px 24px; }
  .step-grid { grid-template-columns: 1fr; }
  .step { border-right: none; }
  .step:nth-child(3), .step:nth-child(4) { border-bottom: 1px solid var(--border); }
  .step:last-child { border-bottom: none; }
  .why-inner { grid-template-columns: 1fr; gap: 40px; }
  .principle-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-stats { flex-direction: column; align-items: flex-start; gap: 16px; }
  .stat-divider { display: none; }
  .nav-inner { padding: 14px 24px; }
}