* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  padding: 20px;
}

nav {
  margin-bottom: 2rem;
  padding: 1rem;
  background: #f4f4f4;
}

nav a {
  margin-right: 1rem;
  text-decoration: none;
  color: #333;
}

main {
  max-width: 800px;
  margin: 0 auto;
}

.cta-button {
  padding: 12px 24px;
  font-size: 16px;
  cursor: pointer;
  border: 2px solid #333;
  background: white;
  margin-top: 1rem;
}

.variant-a .cta-button {
  border-color: #2563eb;
}

.variant-b .cta-button {
  background: #333;
  color: white;
}

.cta-button {
  display: inline-block;
  padding: 18px 40px;
  background-color: #000;
  color: #fff;
  text-decoration: none;
  font-weight: bold;
  font-size: 18px;
  border-radius: 4px;
  transition: background-color 0.3s ease;
}

.cta-button:hover {
  background-color: #333;
}