/* 基本样式 */
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  color: #333;
  background-color: #f5f5f5;
}

/* 布局 */
header {
  background-color: #2c3e50;
  color: white;
  padding: 2rem;
  text-align: center;
}

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

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

h1, h2 {
  color: #2c3e50;
}

h1 {
  margin: 0;
}

h2 {
  border-bottom: 2px solid #2c3e50;
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

ul {
  padding-left: 1.5rem;
}

a {
  color: #3498db;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

footer {
  text-align: center;
  padding: 1rem;
  background-color: #2c3e50;
  color: white;
  margin-top: 2rem;
}