:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #16161f;
  --fg: #e8e8ed;
  --fg-muted: #8a8a9a;
  --fg-dim: #5a5a6a;
  --accent: #00d4aa;
  --accent-glow: rgba(0, 212, 170, 0.15);
  --accent-subtle: rgba(0, 212, 170, 0.08);
  --border: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(0, 212, 170, 0.2);
  --radius: 12px;
  --radius-sm: 8px;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

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

/* ---- HERO ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 48px 80px;
  overflow: hidden;
}

.hero-ambient {
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  max-width: 800px;
  position: relative;
  z-index: 1;
}

.hero-label {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 32px;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(42px, 7vw, 80px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -2px;
  margin-bottom: 28px;
}

.accent {
  color: var(--accent);
}

.lede {
  font-size: clamp(17px, 2vw, 20px);
  color: var(--fg-muted);
  max-width: 580px;
  line-height: 1.7;
  margin-bottom: 56px;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 28px 36px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: fit-content;
}

.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 13px;
  color: var(--fg-dim);
  letter-spacing: 0.3px;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* ---- SIGNAL (Problem) ---- */
.signal {
  padding: 120px 48px;
  border-top: 1px solid var(--border);
}

.signal-container {
  max-width: 1000px;
  margin: 0 auto;
}

.signal-tag {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
  padding: 6px 14px;
  border: 1px solid var(--border-accent);
  border-radius: 100px;
  width: fit-content;
  background: var(--accent-subtle);
}

.signal h2,
.engine h2,
.edge h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 56px;
}

.signal-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.signal-card {
  padding: 36px 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.3s;
}

.signal-card:hover {
  border-color: var(--border-accent);
}

.signal-icon {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 20px;
  opacity: 0.7;
}

.signal-card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}

.signal-card p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* ---- ENGINE (Features) ---- */
.engine {
  padding: 120px 48px;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
}

.engine-container {
  max-width: 1000px;
  margin: 0 auto;
}

.engine-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.engine-feature {
  padding: 40px 36px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.3s;
  position: relative;
}

.engine-feature:hover {
  border-color: var(--border-accent);
}

.engine-feature.main-feature {
  grid-column: span 2;
  background: linear-gradient(135deg, var(--bg) 0%, rgba(0, 212, 170, 0.03) 100%);
  border-color: var(--border-accent);
}

.feature-number {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  background: var(--accent-subtle);
}

.engine-feature h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 12px;
}

.engine-feature p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
  margin-bottom: 20px;
}

.feature-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--fg-dim);
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 100px;
}

/* ---- EDGE ---- */
.edge {
  padding: 120px 48px;
  border-top: 1px solid var(--border);
}

.edge-container {
  max-width: 800px;
  margin: 0 auto;
}

.edge-items {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.edge-item {
  display: flex;
  gap: 28px;
  align-items: flex-start;
}

.edge-marker {
  width: 3px;
  min-height: 60px;
  height: 100%;
  background: linear-gradient(180deg, var(--accent) 0%, transparent 100%);
  border-radius: 2px;
  flex-shrink: 0;
  margin-top: 4px;
}

.edge-content h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.edge-content p {
  font-size: 15px;
  color: var(--fg-muted);
  line-height: 1.65;
}

/* ---- CLOSING ---- */
.closing {
  padding: 140px 48px;
  background: linear-gradient(180deg, var(--bg) 0%, rgba(0, 212, 170, 0.04) 100%);
  border-top: 1px solid var(--border);
  text-align: center;
}

.closing-container {
  max-width: 700px;
  margin: 0 auto;
}

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 24px;
}

.closing-sub {
  font-size: 17px;
  color: var(--fg-muted);
  line-height: 1.7;
}

/* ---- FOOTER ---- */
.site-footer {
  padding: 40px 48px;
  border-top: 1px solid var(--border);
}

.footer-container {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--fg-muted);
}

.footer-meta {
  font-size: 13px;
  color: var(--fg-dim);
}

/* ---- RESPONSIVE ---- */
@media (max-width: 768px) {
  .hero {
    padding: 100px 24px 60px;
    min-height: auto;
  }

  .hero-stats {
    flex-direction: column;
    gap: 20px;
    padding: 24px;
    width: 100%;
  }

  .stat-divider {
    width: 40px;
    height: 1px;
  }

  .signal,
  .engine,
  .edge,
  .closing {
    padding: 80px 24px;
  }

  .signal-grid {
    grid-template-columns: 1fr;
  }

  .engine-grid {
    grid-template-columns: 1fr;
  }

  .engine-feature.main-feature {
    grid-column: span 1;
  }

  .edge-item {
    gap: 20px;
  }

  .site-footer {
    padding: 32px 24px;
  }

  .footer-container {
    flex-direction: column;
    gap: 8px;
  }

  .closing {
    padding: 100px 24px;
  }

  .hero-ambient {
    width: 300px;
    height: 300px;
    top: -100px;
    right: -100px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    letter-spacing: -1px;
  }

  .signal h2,
  .engine h2,
  .edge h2,
  .closing h2 {
    letter-spacing: -0.5px;
  }
}