/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #2563eb;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-bg: #ffffff;
  --color-bg-light: #f9fafb;
  --color-border: #e5e7eb;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --max-width: 1200px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  line-height: 1.6;
  background-color: var(--color-bg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-light);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.8;
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

section {
  padding: var(--spacing-lg) 0;
}

/* Header and Navigation */
header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--spacing-md);
}

.nav-links a {
  color: var(--color-text);
  font-weight: 500;
}

.nav-links a:hover {
  color: var(--color-primary);
}

/* Hero Section */
.hero {
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.hero p {
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto var(--spacing-md);
  color: var(--color-text-light);
}

/* Value Blocks */
.value-blocks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.value-block {
  padding: var(--spacing-md);
  background-color: var(--color-bg-light);
  border-radius: 8px;
}

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

/* How It Works */
.how-it-works {
  background-color: var(--color-bg-light);
  padding: var(--spacing-lg) 0;
  text-align: center;
}

.how-it-works h2 {
  margin-bottom: var(--spacing-md);
}

.how-it-works p {
  max-width: 700px;
  margin: 0 auto;
}

/* Architecture Components */
.arch-components {
  display: grid;
  gap: var(--spacing-md);
  margin: var(--spacing-md) 0;
}

.arch-component {
  padding: var(--spacing-md);
  background-color: var(--color-bg-light);
  border-left: 4px solid var(--color-primary);
  border-radius: 4px;
}

.arch-component h3 {
  margin-bottom: var(--spacing-xs);
}

.arch-component ul {
  margin-left: var(--spacing-md);
  margin-top: var(--spacing-xs);
}

.arch-component li {
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-light);
}

/* Use Cases */
.use-cases {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-md) 0;
}

.use-case {
  padding: var(--spacing-md);
  background-color: var(--color-bg-light);
  border-radius: 8px;
}

.use-case h3 {
  margin-bottom: var(--spacing-xs);
}

/* Contact */
.contact-card {
  max-width: 500px;
  margin: var(--spacing-md) auto;
  padding: var(--spacing-md);
  background-color: var(--color-bg-light);
  border-radius: 8px;
  text-align: center;
}

.contact-card h3 {
  margin-bottom: var(--spacing-sm);
}

.contact-card a {
  font-size: 1.125rem;
  font-weight: 500;
}

/* Footer */
footer {
  background-color: var(--color-bg-light);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
  margin-top: var(--spacing-xl);
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .nav-links {
    flex-direction: column;
    gap: var(--spacing-xs);
    align-items: flex-start;
  }

  nav {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

  .value-blocks,
  .use-cases {
    grid-template-columns: 1fr;
  }

  section {
    padding: var(--spacing-md) 0;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }
}