:root {
  --bg: #0a0e17;
  --bg-elevated: #111827;
  --bg-card: #1a2234;
  --fg: #e8ecf4;
  --fg-muted: #8b9ab8;
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.15);
  --amber: #f59e0b;
  --green: #10b981;
  --red: #ef4444;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --max-width: 1100px;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
}

/* Hero */
.hero {
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

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

.hero-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 20px;
  background: var(--accent-glow);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-bottom: 28px;
}

.hero h1 {
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--fg-muted);
  max-width: 560px;
  margin-bottom: 48px;
}

.hero-demo {
  background: var(--bg-elevated);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 28px;
  max-width: 640px;
}

.demo-query {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.demo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  font-weight: 700;
  font-size: 16px;
  flex-shrink: 0;
}

.demo-text {
  font-style: italic;
  color: var(--fg);
  font-size: 1rem;
}

.demo-answer {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.demo-source {
  font-size: 12px;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.demo-excerpt {
  font-size: 0.95rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

/* Problem */
.problem {
  padding: 100px 24px;
  background: var(--bg-elevated);
}

.problem-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.problem h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-bottom: 48px;
  letter-spacing: -0.01em;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 40px;
}

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

.stat-number {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--amber);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--fg-muted);
}

.problem-statement {
  font-size: 1.05rem;
  color: var(--fg-muted);
  max-width: 680px;
  margin-top: 16px;
}

/* How */
.how {
  padding: 100px 24px;
}

.how-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.how h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-bottom: 56px;
  letter-spacing: -0.01em;
}

.how-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.step {
  position: relative;
}

.step-num {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 700;
  color: rgba(59, 130, 246, 0.2);
  margin-bottom: 12px;
  line-height: 1;
}

.step h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  color: var(--fg);
}

.step p {
  font-size: 0.95rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* Who */
.who {
  padding: 100px 24px;
  background: var(--bg-elevated);
}

.who-container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.who h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  margin-bottom: 48px;
  letter-spacing: -0.01em;
}

.who-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.who-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 10px;
  padding: 28px;
}

.who-card h4 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--fg);
}

.who-card p {
  font-size: 0.9rem;
  color: var(--fg-muted);
  line-height: 1.5;
}

/* Closing */
.closing {
  padding: 120px 24px;
  text-align: center;
}

.closing-container {
  max-width: 720px;
  margin: 0 auto;
}

.closing h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  margin-bottom: 24px;
  letter-spacing: -0.01em;
}

.closing-sub {
  font-size: 1.05rem;
  color: var(--fg-muted);
  margin-bottom: 20px;
}

.closing-vision {
  font-size: 1.1rem;
  color: var(--fg);
  font-weight: 500;
  font-family: var(--font-display);
}

/* Footer */
.site-footer {
  padding: 40px 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

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

.footer-brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--fg-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .problem-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .how-steps {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  
  .who-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-container {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  
  .hero {
    padding: 80px 20px 60px;
  }
  
  .problem, .how, .who {
    padding: 72px 20px;
  }
  
  .closing {
    padding: 80px 20px;
  }
}