:root {
  --bg: #0D1117;
  --bg-elevated: #161B22;
  --bg-card: #1E293B;
  --primary: #00D4AA;
  --primary-dim: rgba(0, 212, 170, 0.15);
  --text: #F8FAFC;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  --border: rgba(148, 163, 184, 0.1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  line-height: 1.2;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 24px;
  background: rgba(13, 17, 23, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 18px;
}

.nav-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 212, 170, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(0, 212, 170, 0.08), transparent);
}

.hero-content {
  max-width: 1100px;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  position: relative;
}

.hero-text {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.hero-headline {
  font-size: clamp(36px, 5vw, 52px);
  font-weight: 700;
  display: flex;
  flex-direction: column;
}

.hero-line-1 {
  color: var(--text);
}

.hero-line-2 {
  color: var(--text-muted);
}

.hero-line-2 em {
  font-style: normal;
  color: var(--primary);
}

.hero-sub {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 480px;
  line-height: 1.7;
}

/* Hero Visual */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.coordination-diagram {
  position: relative;
  width: 280px;
  height: 200px;
}

.node {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.node-team {
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
}

.node-ai {
  left: 50%;
  top: 10px;
  transform: translateX(-50%);
}

.node-work {
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
}

.node-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.node-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.ai-icon {
  background: var(--primary-dim);
  border-color: var(--primary);
  color: var(--primary);
}

.connection-lines {
  position: absolute;
  inset: 0;
}

.connection-lines svg {
  width: 100%;
  height: 100%;
}

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

.features-header {
  max-width: 800px;
  margin: 0 auto 60px;
  text-align: center;
}

.features-title {
  font-size: 36px;
  margin-bottom: 16px;
}

.features-sub {
  color: var(--text-muted);
  font-size: 18px;
}

.features-grid {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 32px;
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 212, 170, 0.3);
}

.feature-card-2 {
  margin-top: 40px;
}

.feature-card-3 {
  margin-top: 80px;
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--primary-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 24px;
}

.feature-title {
  font-size: 20px;
  margin-bottom: 12px;
}

.feature-desc {
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.7;
}

/* Difference */
.difference {
  padding: 120px 24px;
}

.difference-content {
  max-width: 900px;
  margin: 0 auto;
}

.difference-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--primary);
  margin-bottom: 24px;
}

.difference-headline {
  font-size: clamp(32px, 4vw, 44px);
  margin-bottom: 32px;
  max-width: 700px;
}

.difference-body {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 60px;
}

.comparison {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 40px;
  align-items: start;
  padding: 40px;
  background: var(--bg-elevated);
  border-radius: 16px;
}

.comparison-label {
  display: block;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.comparison-old p {
  color: var(--text-muted);
  font-size: 15px;
}

.comparison-new p {
  color: var(--primary);
  font-size: 15px;
  font-weight: 500;
}

.comparison-divider {
  width: 1px;
  height: 60px;
  background: var(--border);
}

/* Closing */
.closing {
  padding: 100px 24px 140px;
  text-align: center;
  background: 
    radial-gradient(ellipse 60% 40% at 50% 100%, rgba(0, 212, 170, 0.1), transparent);
}

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

.closing-headline {
  font-size: clamp(28px, 4vw, 40px);
  margin-bottom: 20px;
}

.closing-body {
  color: var(--text-muted);
  font-size: 18px;
}

/* Footer */
.footer {
  padding: 60px 24px;
  border-top: 1px solid var(--border);
}

.footer-content {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
}

.footer-tagline {
  color: var(--text-dim);
  font-size: 14px;
}

/* Responsive */
@media (max-width: 900px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 60px;
    text-align: center;
  }
  
  .hero-sub {
    margin: 0 auto;
  }
  
  .hero-visual {
    order: -1;
  }
  
  .coordination-diagram {
    transform: scale(0.8);
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .feature-card-2,
  .feature-card-3 {
    margin-top: 0;
  }
  
  .comparison {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .comparison-divider {
    width: 60px;
    height: 1px;
    margin: 0 auto;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 100px 20px 60px;
  }
  
  .hero-headline {
    font-size: 32px;
  }
  
  .features,
  .difference,
  .closing {
    padding: 60px 20px;
  }
  
  .feature-card {
    padding: 28px 24px;
  }
}