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

/* Body */
body {
  font-family: Arial, sans-serif;
  background: #f4f6f9;
  color: #333;
  line-height: 1.6;
}

/* Header */
header {
  background: #1f3b73;
  color: white;
  padding: 1rem;
  text-align: center;
}

header h1 {
  margin-bottom: 0.5rem;
}

/* Navigation */
nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

nav ul li {
  margin: 0.5rem;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: bold;
  padding: 0.4rem 0.8rem;
  border-radius: 5px;
  transition: background 0.3s;
}

nav a:hover {
  background: #3e6cc1;
}

/* Sections */
main {
  padding: 2rem;
  max-width: 900px;
  margin: auto;
}

section {
  margin-bottom: 2rem;
}

h2 {
  color: #1f3b73;
  margin-bottom: 1rem;
}

/* Images */
.illustration {
  max-width: 300px;
  display: block;
  margin: 1rem auto;
  border-radius: 10px;
  box-shadow: 0 0 5px rgba(0,0,0,0.2);
}

/* Footer */
footer {
  background: #1f3b73;
  color: white;
  text-align: center;
  padding: 1rem;
}