:root {
  --bg: #0D1117;
  --bg-2: #161B22;
  --bg-3: #1C2128;
  --fg: #E6EDF3;
  --fg-2: #8B949E;
  --fg-3: #484F58;
  --accent: #39FF14;
  --accent-dim: rgba(57, 255, 20, 0.12);
  --accent-2: #58E068;
  --border: rgba(139, 148, 158, 0.12);
  --radius: 8px;
  --font-display: 'Syne', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

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

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

/* ── Top bar ── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13, 17, 23, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 32px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.wordmark {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.3px;
}
.tagline {
  font-size: 13px;
  color: var(--fg-2);
  border-left: 1px solid var(--border);
  padding-left: 16px;
}

/* ── Hero ── */
.hero { padding: 96px 32px 80px; }
.hero-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.hero-text h1 {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -1.5px;
  color: var(--fg);
  margin-bottom: 20px;
}
.hero-sub {
  font-size: 17px;
  color: var(--fg-2);
  line-height: 1.65;
  max-width: 460px;
}

/* Agent loop animation */
.hero-loop {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 280px;
}
.loop-orbit {
  position: relative;
  width: 240px;
  height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.orbit-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(57, 255, 20, 0.15);
}
.orbit-ring-1 { width: 140px; height: 140px; animation: pulse 3s ease-in-out infinite; }
.orbit-ring-2 { width: 190px; height: 190px; animation: pulse 3s ease-in-out infinite 0.5s; }
.orbit-ring-3 { width: 240px; height: 240px; animation: pulse 3s ease-in-out infinite 1s; }
@keyframes pulse { 0%, 100% { opacity: 0.4; } 50% { opacity: 1; } }
.loop-center {
  width: 48px; height: 48px;
  background: var(--accent-dim);
  border: 1.5px solid var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  animation: glow 2s ease-in-out infinite alternate;
}
@keyframes glow { from { box-shadow: 0 0 12px rgba(57,255,20,0.3); } to { box-shadow: 0 0 24px rgba(57,255,20,0.6); } }
.node {
  position: absolute;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--fg-2);
  white-space: nowrap;
}
.node-research { top: 4px; left: 50%; transform: translateX(-50%); }
.node-build { bottom: 30px; right: 0; }
.node-market { bottom: 30px; left: 0; }
.node-support { top: 50%; right: -8px; transform: translateY(-50%); }

/* Stats */
.hero-stats {
  max-width: 1100px;
  margin: 64px auto 0;
  padding: 28px 40px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  align-items: center;
  gap: 0;
}
.stat { padding: 0 40px; }
.stat:first-child { padding-left: 0; }
.stat-value {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  display: block;
}
.stat-label {
  font-size: 13px;
  color: var(--fg-2);
  display: block;
  margin-top: 2px;
}
.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
  flex-shrink: 0;
}

/* Shared section styles */
.loop-section, .ecosystems-section, .manifesto, .closing {
  padding: 96px 32px;
}
.section-inner, .manifesto-inner, .closing-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.section-eyebrow {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.section-heading {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  letter-spacing: -1px;
  color: var(--fg);
  margin-bottom: 16px;
}
.section-sub {
  font-size: 17px;
  color: var(--fg-2);
  line-height: 1.65;
  max-width: 580px;
  margin-bottom: 56px;
}

/* Loop steps */
.loop-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.loop-step {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 24px;
  background: var(--bg-2);
  transition: border-color 0.2s;
}
.loop-step:hover { border-color: rgba(57,255,20,0.3); }
.step-num {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.step-body h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 10px;
}
.step-body p {
  font-size: 14px;
  color: var(--fg-2);
  line-height: 1.6;
}

/* Ecosystems */
.loop-section { background: var(--bg); }
.ecosystems-section { background: var(--bg-2); }
.eco-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.eco-card {
  padding: 28px 24px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-3);
  transition: border-color 0.2s;
}
.eco-card:hover { border-color: rgba(57,255,20,0.25); }
.eco-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-dim);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.eco-card h3 {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 8px;
}
.eco-card p {
  font-size: 13px;
  color: var(--fg-2);
  line-height: 1.55;
}

/* Manifesto */
.manifesto { background: var(--bg); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.manifesto-inner { max-width: 800px; }
blockquote {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 400;
  line-height: 1.45;
  color: var(--fg);
  font-style: italic;
  margin-bottom: 28px;
}
.manifesto-cta {
  font-size: 17px;
  color: var(--fg-2);
  line-height: 1.6;
}

/* Closing */
.closing { background: var(--bg); }
.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  letter-spacing: -1px;
  color: var(--fg);
  margin-bottom: 20px;
  max-width: 640px;
}
.closing p {
  font-size: 17px;
  color: var(--fg-2);
  line-height: 1.65;
  max-width: 560px;
  margin-bottom: 40px;
}
.closing-signal {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
}
.signal-dot {
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: blink 1.5s ease-in-out infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 32px;
}
.footer-inner { max-width: 1100px; margin: 0 auto; }
.footer-brand {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--fg);
  margin-bottom: 4px;
}
.footer-meta { font-size: 13px; color: var(--fg-2); }

/* Responsive */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-loop { min-height: 220px; }
  .loop-steps { grid-template-columns: 1fr 1fr; }
  .eco-grid { grid-template-columns: 1fr 1fr; }
  .hero-stats { flex-direction: column; gap: 20px; align-items: flex-start; }
  .stat { padding: 0; }
  .stat-divider { width: 40px; height: 1px; }
  .stat-value { font-size: 24px; }
}
@media (max-width: 600px) {
  .hero { padding: 64px 20px 56px; }
  .loop-section, .ecosystems-section { padding: 64px 20px; }
  .manifesto, .closing { padding: 64px 20px; }
  .loop-steps, .eco-grid { grid-template-columns: 1fr; }
  .hero-stats { padding: 20px 24px; }
  .topbar-inner { padding: 12px 20px; }
  h1 { letter-spacing: -0.5px; }
}