/* 全局样式 */
body {
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.container {
  background: #fff;
  border-radius: 8px;
  padding: 30px;
  margin: 20px auto;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

h1 {
  color: #2c3e50;
  font-size: 2em;
  border-bottom: 3px solid #3498db;
  padding-bottom: 10px;
}

h2 {
  color: #34495e;
  font-size: 1.5em;
  margin-top: 25px;
  border-left: 4px solid #3498db;
  padding-left: 10px;
}

ul li {
  padding: 10px;
  border-bottom: 1px solid #ecf0f1;
  transition: background 0.3s;
}

ul li:hover {
  background: #f8f9fa;
}

a {
  color: #3498db;
  transition: color 0.3s;
}

a:hover {
  color: #2980b9;
  text-decoration: underline;
}

nav a {
  font-weight: 500;
  transition: all 0.3s;
}

nav a:hover {
  color: #2980b9;
  transform: scale(1.05);
}

/* 响应式 */
@media (max-width: 768px) {
  .container {
    padding: 15px;
  }
  h1 {
    font-size: 1.5em;
  }
  h2 {
    font-size: 1.2em;
  }
}