:root {
  --primary-color: #2563eb;
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --bg-color: #f9fafb;
  --card-bg: #ffffff;
  --border-color: #e5e7eb;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-color);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

header {
  text-align: center;
  margin-bottom: 3rem;
  padding: 2rem 0;
  background-color: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

header p {
  color: var(--text-secondary);
  font-size: 1.125rem;
}

.content {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

h1, h2, h3 {
  color: var(--text-primary);
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

h1 {
  font-size: 2.25rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
}

h2 {
  font-size: 1.5rem;
}

p {
  margin-bottom: 1.25rem;
}

ul, ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

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

a:hover {
  color: #1d4ed8;
  text-decoration: underline;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  margin-top: 2rem;
}

.nav-links a {
  padding: 0.75rem 1.5rem;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-weight: 500;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
  transition: all 0.2s ease;
}

.nav-links a:hover {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 4px 6px rgba(37, 99, 235, 0.2);
}

footer {
  text-align: center;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

@media (max-width: 640px) {
  .content {
    padding: 1.5rem;
  }
  
  header h1 {
    font-size: 2rem;
  }
}