:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #161622;
  --fg: #e8e8ed;
  --fg-muted: #8888a0;
  --accent: #00f0a0;
  --accent-dim: rgba(0, 240, 160, 0.12);
  --accent-glow: rgba(0, 240, 160, 0.25);
  --border: rgba(255,255,255,0.06);
  --font-display: 'Space Grotesk', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

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

/* ===== HERO ===== */
.hero {
  min-height: 90vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 120px 48px 80px;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -100px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
  opacity: 0.3;
}

.hero-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 24px;
  font-weight: 500;
}

.hero h1 {
  font-size: clamp(2.8rem, 6vw, 5.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 28px;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 540px;
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 72px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--fg-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ===== FEATURES ===== */
.features {
  padding: 120px 48px;
  max-width: 1200px;
  margin: 0 auto;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  display: block;
  margin-bottom: 16px;
}

.features-header h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 64px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 40px 36px;
  transition: border-color 0.3s;
}

.feature-card:hover {
  border-color: rgba(0, 240, 160, 0.2);
}

.feature-large {
  grid-column: span 2;
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(0, 240, 160, 0.04) 100%);
}

.feature-icon {
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 20px;
  display: inline-block;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.feature-card p {
  color: var(--fg-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ===== ARCHITECTURE ===== */
.architecture {
  padding: 100px 48px;
  max-width: 1200px;
  margin: 0 auto;
  border-top: 1px solid var(--border);
}

.arch-desc {
  font-size: 1.1rem;
  color: var(--fg-muted);
  max-width: 640px;
  line-height: 1.7;
  margin-bottom: 48px;
}

.arch-content h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.arch-stack {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.stack-item {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stack-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--fg-muted);
  text-transform: uppercase;
}

.stack-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
}

/* ===== CLOSING ===== */
.closing {
  padding: 140px 48px;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.closing h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
}

.closing-text {
  font-size: 1.05rem;
  color: var(--fg-muted);
  line-height: 1.8;
  max-width: 620px;
  margin: 0 auto;
}

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

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-brand {
  font-weight: 600;
  font-size: 0.9rem;
}

.footer-divider {
  color: var(--fg-muted);
  opacity: 0.3;
}

.footer-note {
  font-size: 0.8rem;
  color: var(--fg-muted);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .hero {
    padding: 80px 24px 60px;
    min-height: 80vh;
  }

  .hero-stats {
    flex-direction: column;
    gap: 24px;
    margin-top: 48px;
  }

  .features {
    padding: 80px 24px;
  }

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

  .feature-large {
    grid-column: span 1;
  }

  .architecture {
    padding: 80px 24px;
  }

  .arch-stack {
    grid-template-columns: repeat(2, 1fr);
  }

  .closing {
    padding: 80px 24px;
  }

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

  .footer-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .footer-divider {
    display: none;
  }
}

@media (max-width: 480px) {
  .arch-stack {
    grid-template-columns: 1fr;
  }

  .feature-card {
    padding: 28px 24px;
  }
}