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

body {
  font-family: Helvetica Neue, Arial, Helvetica, sans-serif;
  background: #f5f5f5;
  color: #222;
  line-height: 1.6;
}

/* HEADER */
header {
  background: #333;
  color: #fff;
  padding: 25px 15px;
  text-align: center;
}

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

/* NAVIGAZIONE */
nav {
  background: #444;
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
}

nav ul li a {
  display: block;
  padding: 14px 22px;
  color: #fff;
  text-decoration: none;
  transition: 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
  background: #fff;
  color: #333;
}

/* CONTENUTO PRINCIPALE */
main {
  max-width: 1100px;
  margin: 30px auto;
  padding: 25px;
  background: #fff;
  border-radius: 6px;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
}

main h2 {
  margin-bottom: 15px;
}

main p {
  margin-bottom: 15px;
}

/* FOOTER */
footer {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 15px;
  margin-top: 40px;
}

/* RESPONSIVE */
@media (max-width: 600px) {
  nav ul {
    flex-direction: column;
  }

  nav ul li a {
    border-bottom: 1px solid #555;
    text-align: center;
  }

  main {
    margin: 15px;
    padding: 20px;
  }
}