* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #1a1a2e;
}

main {
  max-width: 640px;
  margin: 4rem auto;
  padding: 2rem;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

h1 {
  margin-top: 0;
  color: #764ba2;
}

code {
  background: #f0f0f5;
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}