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

body {
  font-family: sans-serif;
  color: #1e293b;
  line-height: 1.6;
}

nav {
  display: flex;
  gap: 1.5rem;
  padding: 1rem 2rem;
  background: #f8fafc;
  border-bottom: 1px solid #e2e8f0;
}

nav a {
  text-decoration: none;
  color: #2563eb;
  font-weight: 500;
}

nav a:hover { text-decoration: underline; }

main {
  max-width: 860px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.85rem;
  color: #64748b;
  border-top: 1px solid #e2e8f0;
  margin-top: 4rem;
}