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

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f5f5f5;
}

header {
  background-color: #000;
  color: #fff;
  text-align: center;
  padding: 1rem;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
}

.card {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

h1 {
  font-size: 1.8rem;
}

h2 {
  font-size: 1.4rem;
  margin-bottom: 1rem;
  color: #000;
}

p {
  margin-bottom: 1rem;
}

ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

footer {
  background-color: #000;
  color: #fff;
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
}

button {
  background-color: #000;
  color: #fff;
  border: none;
  padding: 0.8rem 1.5rem;
  font-size: 1rem;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 1rem;
  display: block;
}

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

@media (max-width: 600px) {
  .container {
    padding: 0.5rem;
  }
  
  .card {
    padding: 1rem;
  }
}