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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: #fafafa;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

header {
  text-align: center;
  padding: 4rem 1rem 2rem;
}

header h1 {
  font-size: 2rem;
  font-weight: 600;
  color: #111;
}

header p {
  margin-top: 0.5rem;
  color: #666;
}

nav {
  text-align: center;
  padding: 1rem 0;
  border-top: 1px solid #e0e0e0;
  border-bottom: 1px solid #e0e0e0;
  margin-bottom: 2rem;
}

nav a {
  color: #555;
  text-decoration: none;
  margin: 0 1rem;
  font-size: 0.9rem;
}

nav a:hover {
  color: #111;
  text-decoration: underline;
}

main {
  padding: 1rem 0;
}

h2 {
  font-size: 1.3rem;
  margin: 2rem 0 0.5rem;
  color: #111;
}

h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
  color: #222;
}

p, ul, ol {
  margin-bottom: 1rem;
}

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

a {
  color: #0066cc;
}

footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e0e0e0;
  text-align: center;
  font-size: 0.85rem;
  color: #888;
}

footer a {
  color: #888;
  text-decoration: none;
  margin: 0 0.5rem;
}

footer a:hover {
  color: #333;
}