/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  line-height: 1.6;
  padding: 10px;
}

/* Responsive breakpoints */
@media (max-width: 768px) {
  body {
    padding: 15px;
  }

  .content {
    padding: 20px;
  }

  .btn-primary {
    width: 100%;
    text-align: center;
  }
}

@media (max-width: 480px) {
  body {
    padding: 10px;
  }

  header h1 {
    font-size: 1.6rem;
  }

  .content h2 {
    font-size: 1.2rem;
  }

  .btn-primary {
    padding: 10px 20px;
  }
}