/* ADR-Compliant Dark Mode Design System */
:root {
  /* Colors from ADR */
  --deep-midnight: #0A0E1A;
  --elevated-carbon: #161B2E;
  --layered-slate: #1E2535;
  --electric-trust-blue: #60A5FA;
  --growth-mint-green: #34D399;
  --cloud-white: #F3F4F6;
  --silver-mist: #9CA3AF;
  --dim-slate: #6B7280;
  
  /* Spacing */
  --spacing-small: 8px;
  --spacing-medium: 16px;
  --spacing-large: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  
  /* Border Radius */
  --radius-small: 8px;
  --radius-medium: 16px;
  --radius-large: 24px;
}

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

body {
  background-color: var(--deep-midnight);
  color: var(--cloud-white);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-large);
}

/* Header */
header {
  text-align: center;
  padding: var(--spacing-xxl) 0;
}

.title {
  font-size: 48px;
  font-weight: 700;
  color: var(--cloud-white);
  margin-bottom: var(--spacing-medium);
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 20px;
  color: var(--silver-mist);
  max-width: 600px;
  margin: 0 auto;
}

/* Sections */
section {
  margin: var(--spacing-xxl) 0;
}

h2 {
  font-size: 32px;
  font-weight: 600;
  color: var(--cloud-white);
  margin-bottom: var(--spacing-large);
  text-align: center;
}

h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--electric-trust-blue);
  margin-bottom: var(--spacing-small);
}

p {
  color: var(--silver-mist);
  margin-bottom: var(--spacing-medium);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* About Section */
.about {
  text-align: center;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-large);
  margin-top: var(--spacing-xl);
}

.feature {
  background-color: var(--elevated-carbon);
  padding: var(--spacing-large);
  border-radius: var(--radius-medium);
  text-align: left;
  border: 1px solid var(--layered-slate);
}

.feature p {
  margin-bottom: 0;
}

/* CTA Section */
.cta {
  text-align: center;
  padding: var(--spacing-xxl) 0;
  background-color: var(--elevated-carbon);
  border-radius: var(--radius-large);
  margin: var(--spacing-xxl) 0;
}

.button {
  display: inline-block;
  background-color: var(--electric-trust-blue);
  color: var(--cloud-white);
  padding: var(--spacing-medium) var(--spacing-xl);
  border-radius: var(--radius-medium);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: opacity 0.25s ease;
  margin-top: var(--spacing-medium);
}

.button:hover {
  opacity: 0.9;
}

/* Footer */
footer {
  margin-top: var(--spacing-xxl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--layered-slate);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-large);
  margin-bottom: var(--spacing-medium);
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--electric-trust-blue);
  text-decoration: none;
  font-size: 14px;
}

.footer-links a:hover {
  text-decoration: underline;
}

.footer-text {
  color: var(--dim-slate);
  font-size: 14px;
  margin-bottom: var(--spacing-small);
}

/* Responsive */
@media (max-width: 768px) {
  .title {
    font-size: 36px;
  }
  
  h2 {
    font-size: 24px;
  }
  
  .features {
    grid-template-columns: 1fr;
  }
}