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

:root {
  --text-primary: #1a1a1a;
  --text-secondary: #666;
  --bg-primary: #ffffff;
  --bg-secondary: #f5f5f5;
  --border-color: #e0e0e0;
  --link-color: #0066cc;
  --link-hover: #0052a3;
  --accent: #0066cc;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #e8e8e8;
    --text-secondary: #b0b0b0;
    --bg-primary: #1a1a1a;
    --bg-secondary: #2a2a2a;
    --border-color: #404040;
    --link-color: #6eb3ff;
    --link-hover: #94c8ff;
    --accent: #6eb3ff;
  }
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
  font-size: 16px;
}

/* Layout */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header */
header {
  border-bottom: 1px solid var(--border-color);
  padding: 2rem 0;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.header-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Navigation */
nav {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

nav a {
  color: var(--link-color);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s;
}

nav a:hover,
nav a:focus {
  color: var(--link-hover);
  text-decoration: underline;
}

/* Main content */
main {
  margin-bottom: 3rem;
}

h2 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem 0;
  font-weight: 600;
}

h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.8rem 0;
  font-weight: 600;
}

p {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

ul, ol {
  margin: 1rem 0 1rem 2rem;
  color: var(--text-primary);
}

li {
  margin-bottom: 0.5rem;
}

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

a:hover,
a:focus {
  color: var(--link-hover);
  text-decoration: underline;
}

strong {
  font-weight: 600;
}

/* Sections */
section {
  margin: 2rem 0;
  padding: 1.5rem;
  background-color: var(--bg-secondary);
  border-radius: 4px;
}

section:first-child {
  margin-top: 0;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

footer p {
  margin-bottom: 0.5rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.footer-links a {
  color: var(--link-color);
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    padding: 1rem;
  }

  header h1 {
    font-size: 1.5rem;
  }

  nav {
    gap: 1rem;
    flex-direction: column;
  }

  h2 {
    font-size: 1.2rem;
  }

  section {
    padding: 1rem;
  }
}

/* Print */
@media print {
  header,
  footer,
  nav {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  a {
    text-decoration: underline;
  }
}