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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: #333;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

header {
  text-align: center;
  padding: 3rem 0;
  color: #fff;
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 1.2rem;
  opacity: 0.9;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.card h2 {
  color: #667eea;
  margin-bottom: 1rem;
  font-size: 1.4rem;
}

.card p,
.card li {
  line-height: 1.7;
  color: #555;
}

.card ul {
  padding-left: 1.5rem;
}

.card li {
  margin-bottom: 0.5rem;
}

code {
  background: #f0f0f5;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
  color: #764ba2;
}

footer {
  text-align: center;
  padding: 2rem 0;
  color: rgba(255, 255, 255, 0.8);
}

footer a {
  color: #fff;
  text-decoration: underline;
}