body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header, footer {
  background: #222;
  color: white;
  padding: 1em;
  text-align: center;
}

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  justify-content: center;
  gap: 1em;
}

nav a {
  color: white;
  text-decoration: none;
}

nav a.active {
  font-weight: bold;
  text-decoration: underline;
}

.banner {
  position: relative;
  text-align: center;
}

.banner img {
  width: 100%;
  height: auto;
}

.banner .overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  background: rgba(0,0,0,0.5);
  padding: 1em;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1em;
  padding: 1em;
}

.card {
  border: 1px solid #ccc;
  padding: 1em;
  text-align: center;
}

form {
  display: flex;
  flex-direction: column;
  max-width: 400px;
  margin: auto;
  gap: 0.5em;
}