* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  line-height: 1.5;
  background: #f8f9fb;
  color: #1f2937;
}

header {
  background: #0f4c81;
  color: #ffffff;
  padding: 1rem;
}

nav {
  margin-top: 0.5rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

nav a {
  color: #ffffff;
  text-decoration: none;
  padding: 0.35rem 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 4px;
}

nav a:hover {
  background: rgba(255, 255, 255, 0.15);
}

main {
  max-width: 900px;
  margin: 1.5rem auto;
  padding: 0 1rem;
}