body {
  font-family: system-ui, sans-serif;
  margin: 0;
  background: #f5f6f8;
  color: #1f2430;
}
 
main {
  max-width: 480px;
  margin: 12vh auto;
  padding: 2rem;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}
 
h1 {
  margin-top: 0;
  font-size: 1.4rem;
}
 
nav {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.5rem;
}
 
nav a,
button {
  display: block;
  padding: 0.7rem 1rem;
  text-align: center;
  text-decoration: none;
  font: inherit;
  color: #fff;
  background: #2f5bea;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}
 
nav a:hover,
button:hover {
  background: #2448c2;
}
 
form {
  margin-top: 1.5rem;
}