body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  margin: 0;
  background-color: #f5f5f5;
  color: #333;
}

header {
  background-color: #004d40;
  color: #fff;
  padding: 1rem;
  text-align: center;
}

main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background: #fff;
  border-radius: 4px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.form label {
  display: block;
  margin-top: 1rem;
}

.form input {
  margin-top: 0.25rem;
  padding: 0.4rem;
  width: 100%;
  box-sizing: border-box;
}

.form select {
  margin-top: 0.25rem;
  padding: 0.4rem;
  width: 100%;
  box-sizing: border-box;
}

button, .button {
  background-color: #009688;
  color: #fff;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  margin-top: 1rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

button:hover, .button:hover {
  background-color: #00796b;
}

.list {
  list-style: none;
  padding: 0;
  margin-top: 1rem;
}

.list li {
  padding: 0.25rem 0;
  border-bottom: 1px solid #eee;
}

.cards {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.nav-card {
  text-decoration: none;
  color: inherit;
  display: block;
}

nav {
  margin-top: 0.5rem;
}

nav .button {
  margin-right: 0.5rem;
}