/* Shared CSS */
body {
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f9f9f9;
  color: #333;
}

header {
  background: #4a90e2;
  color: white;
  padding: 1rem;
  text-align: center;
  font-size: 1.5rem;
  font-weight: bold;
}

nav {
  display: flex;
  justify-content: center;
  background: #357ABD;
}

nav a {
  flex: 1;
  text-align: center;
  padding: 0.8rem;
  color: white;
  text-decoration: none;
  font-size: 1rem;
  transition: background 0.3s;
}

nav a:hover, nav a.active {
  background: #285A8F;
}

main {
  padding: 1rem;
  max-width: 700px;
  margin: auto;
}

section {
  background: white;
  margin-bottom: 1rem;
  padding: 1rem;
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

h2 {
  margin-top: 0;
  color: #4a90e2;
}

ul {
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

@media (max-width: 500px) {
  nav a {
    font-size: 0.9rem;
    padding: 0.7rem;
  }
}