* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
}

.container {
  max-width: 640px;
  margin: 10vh auto;
  padding: 2rem;
  text-align: center;
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}