:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #1a1a25;
  --fg: #e8e8ed;
  --fg-muted: #8a8a9a;
  --accent: #4df0c8;
  --accent-dim: rgba(77, 240, 200, 0.08);
  --border: rgba(255, 255, 255, 0.06);
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

/* Hero */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  padding: 6rem 2rem 4rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(77, 240, 200, 0.04) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-grid {
  max-width: 900px;
  margin: 0 auto;
}

.hero-tag {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 2rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 540px;
  line-height: 1.7;
  margin-bottom: 3.5rem;
  font-weight: 300;
}

.hero-stats {
  display: flex;
  gap: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.stat-value {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--fg-muted);
  letter-spacing: 0.02em;
}

/* System Section */
.system {
  padding: 6rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.section-tag {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--accent);
  display: block;
  margin-bottom: 1rem;
}

.system-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 3rem;
  max-width: 600px;
  letter-spacing: -0.01em;
}

.system-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.system-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  transition: border-color 0.2s ease;
}

.system-card:hover {
  border-color: rgba(77, 240, 200, 0.15);
}

.card-number {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.system-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.system-card p {
  font-size: 0.92rem;
  color: var(--fg-muted);
  line-height: 1.6;
  font-weight: 300;
}

/* Metrics Section */
.metrics {
  padding: 6rem 2rem;
  background: var(--bg-elevated);
}

.metrics-inner {
  max-width: 800px;
  margin: 0 auto;
}

.metrics-inner h2 {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 600;
  margin-bottom: 3rem;
  letter-spacing: -0.01em;
}

.metrics-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.metric-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
  gap: 2rem;
}

.metric-row:first-child {
  border-top: 1px solid var(--border);
}

.metric-name {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 500;
  white-space: nowrap;
}

.metric-desc {
  font-size: 0.85rem;
  color: var(--fg-muted);
  text-align: right;
  font-weight: 300;
}

/* Closing */
.closing {
  padding: 8rem 2rem;
  text-align: center;
}

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

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.closing-text {
  font-size: 1.05rem;
  color: var(--fg-muted);
  line-height: 1.8;
  font-weight: 300;
}

/* Footer */
.site-footer {
  padding: 3rem 2rem;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}

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

/* Mobile */
@media (max-width: 768px) {
  .hero {
    min-height: auto;
    padding: 4rem 1.5rem 3rem;
  }

  .hero-stats {
    flex-direction: column;
    gap: 1.5rem;
  }

  .system {
    padding: 4rem 1.5rem;
  }

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

  .metrics {
    padding: 4rem 1.5rem;
  }

  .metric-row {
    flex-direction: column;
    gap: 0.3rem;
    align-items: flex-start;
  }

  .metric-desc {
    text-align: left;
  }

  .closing {
    padding: 5rem 1.5rem;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
  }
}