/* 全局样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Arial', sans-serif;
}

body {
  background-color: #f5f5f5;
  line-height: 1.6;
  color: #333;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* 导航/目录样式 */
.directory {
  background: white;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  margin-top: 20px;
}

.directory h2 {
  margin-bottom: 20px;
  color: #2c3e50;
  border-bottom: 2px solid #3498db;
  padding-bottom: 10px;
}

.directory ul {
  list-style: none;
}

.directory li {
  margin: 10px 0;
}

.directory a {
  text-decoration: none;
  color: #3498db;
  font-size: 18px;
  padding: 8px 12px;
  display: inline-block;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.directory a:hover {
  background-color: #3498db;
  color: white;
}

/* 登录表单样式 */
.login-container {
  max-width: 400px;
  margin: 50px auto;
  background: white;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.login-container h2 {
  text-align: center;
  margin-bottom: 30px;
  color: #2c3e50;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: bold;
}

.form-group input {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
}

.btn {
  width: 100%;
  padding: 12px;
  background-color: #3498db;
  color: white;
  border: none;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.btn:hover {
  background-color: #2980b9;
}

.error-message {
  color: #e74c3c;
  text-align: center;
  margin-bottom: 20px;
  padding: 10px;
  background-color: #f8d7da;
  border-radius: 4px;
  display: none;
}

/* 受保护页面样式 */
.protected-page {
  background: white;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  margin-top: 20px;
}

.logout-btn {
  background-color: #e74c3c;
  margin-top: 20px;
}

.logout-btn:hover {
  background-color: #c0392b;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .directory, .protected-page {
    padding: 20px;
  }
  
  .login-container {
    width: 90%;
  }
}