/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #ccff00; /* Neon Lime / Volt */
  --color-primary-dark: #aadd00;
  --color-text: #ededed;
  --color-text-light: #a1a1aa;
  --color-bg: #0a0a0a; /* Very dark grey/black */
  --color-bg-light: #111111;
  --color-border: #333333;
  --color-code-bg: #1a1a1a;
  --color-code-text: #ededed;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --max-width: 1200px;
  --border-radius: 0.5rem;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* Hero section */
.hero {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-sm) var(--spacing-lg);
}

.hero h1 {
  font-size: 5rem;
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
  letter-spacing: -0.05em;
  text-shadow: 0 0 20px rgba(204, 255, 0, 0.2);
}

.tagline {
  font-size: 1.5rem;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
}

.description {
  font-size: 1.125rem;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto var(--spacing-md);
  line-height: 1.8;
}

.description strong {
  color: var(--color-primary);
  font-weight: 600;
}

.cta {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.button {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.2s;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.9rem;
}

.button.primary {
  background: var(--color-primary);
  color: black;
  border: 1px solid var(--color-primary);
}

.button.primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 0 15px rgba(204, 255, 0, 0.4);
}

.button.secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.button.secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* Core Primitives & Intent signals */
.core-primitives,
.intent-signals {
  padding: var(--spacing-lg) var(--spacing-sm);
  background: var(--color-bg-light);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.core-primitives h2,
.intent-signals h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.section-intro {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
  font-size: 1.1rem;
}

.signals-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.signal {
  background: var(--color-bg);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  text-align: center;
  transition: transform 0.2s, border-color 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.signal:hover {
  transform: translateY(-5px);
  border-color: var(--color-primary);
}

.signal-icon {
  margin-bottom: var(--spacing-sm);
  color: var(--color-primary);
  background: rgba(204, 255, 0, 0.1);
  padding: 1rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
}

.signal-icon svg {
  width: 32px;
  height: 32px;
}

.signal h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
  font-family: 'Monaco', 'Menlo', monospace;
}

.signal p {
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
  flex-grow: 1;
}

.inline-code {
  background: var(--color-code-bg);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', monospace;
  font-size: 0.8rem;
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  width: 100%;
  text-align: center;
  display: block;
}

/* Demo section */
.demo {
  padding: var(--spacing-lg) var(--spacing-sm);
  text-align: center;
}

.demo h2 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.demo-description {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
  font-size: 1.125rem;
}

.demo-island {
  display: flex;
  justify-content: center;
  padding: var(--spacing-md);
}

.counter {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--color-bg-light);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
}

.counter-btn {
  width: 48px;
  height: 48px;
  border: 1px solid var(--color-primary);
  background: transparent;
  color: var(--color-primary);
  border-radius: var(--border-radius);
  font-size: 1.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.counter-btn:hover {
  background: var(--color-primary);
  color: black;
  box-shadow: 0 0 10px rgba(204, 255, 0, 0.3);
}

.counter-btn:active {
  transform: scale(0.95);
}

.counter-value {
  font-size: 2rem;
  font-weight: 700;
  min-width: 60px;
  text-align: center;
  color: var(--color-text);
  font-family: monospace;
}

/* Code example */
.code-example {
  padding: var(--spacing-lg) var(--spacing-sm);
  background: var(--color-bg-light);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.code-example h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.code-explainer {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
  font-size: 0.9rem;
}

.code-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-md);
}

.code-block {
  background: var(--color-code-bg);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
}

.code-block h3 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.code-block pre {
  margin: 0;
  overflow-x: auto;
  flex-grow: 1;
  padding-top: var(--spacing-sm);
}

.code-block code {
  color: var(--color-text);
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Links */
.links {
  padding: var(--spacing-lg) var(--spacing-sm);
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
}

.links h2 {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.link-card {
  background: var(--color-bg-light);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  border: 1px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text);
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.link-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.card-icon {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.link-card h3 {
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.link-card p {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

/* Footer */
.footer {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-sm);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-light);
  background: var(--color-bg);
}

.footer a {
  color: var(--color-text);
  text-decoration: none;
  margin: 0 var(--spacing-xs);
  transition: color 0.2s;
}

.footer a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

.license {
  margin-top: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--color-text-light);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 3rem;
  }
  
  .tagline {
    font-size: 1.25rem;
  }
  
  .signals-grid,
  .code-grid,
  .links-grid {
    grid-template-columns: 1fr;
  }
  
  .code-block {
    overflow-x: auto;
  }
}