body {
  font-family: Arial, Helvetica, sans-serif;
  background: #f1f1f1;
  color: #000;
  margin: 0;
  line-height: 1.6;
}

header {
  background: #003366;
  color: #fff;
  padding: 1.5em;
  text-align: center;
}

.subtitle {
  font-size: 0.95em;
  opacity: 0.9;
}

nav {
  background: #222;
}

.menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
}

.menu > li {
  position: relative;
}

.menu a {
  display: block;
  padding: 0.8em 1.2em;
  color: #fff;
  text-decoration: none;
}

.menu a:hover {
  background: #444;
}

.dropdown {
  display: none;
  position: absolute;
  background: #333;
  list-style: none;
  padding: 0;
  margin: 0;
  min-width: 220px;
  z-index: 1000;
}

.dropdown li a {
  padding: 0.7em 1em;
}

.menu li:hover .dropdown {
  display: block;
}

main {
  max-width: 900px;
  margin: auto;
  padding: 1.5em;
  background: #fff;
}

h2 {
  border-bottom: 2px solid #ddd;
  padding-bottom: 0.3em;
}

ul {
  margin-left: 1.2em;
}

.button {
  display: inline-block;
  background: #7DC623;
  color: #000;
  padding: 0.6em 1em;
  text-decoration: none;
  font-weight: bold;
}

.button:hover {
  background: #6ab31d;
}

footer {
  text-align: center;
  padding: 1em;
  font-size: 0.9em;
  background: #eee;
}