/* 基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f4f4f4;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* 头部样式 */
.header {
  background: #333;
  color: #fff;
  padding: 10px 20px;
  margin-bottom: 20px;
  border-radius: 5px;
}

.header h1 {
  font-size: 24px;
  margin-bottom: 10px;
}

.header nav {
  display: flex;
  gap: 15px;
}

.header nav a {
  color: #fff;
  text-decoration: none;
  padding: 5px 10px;
  border-radius: 3px;
  transition: background 0.3s;
}

.header nav a:hover {
  background: #555;
}

/* 登录页面样式 */
.login-container {
  max-width: 400px;
  margin: 100px auto;
  padding: 30px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.login-container h2 {
  text-align: center;
  margin-bottom: 20px;
  color: #333;
}

.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

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

.btn {
  display: inline-block;
  padding: 10px 20px;
  background: #333;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  transition: background 0.3s;
}

.btn:hover {
  background: #555;
}

.btn-primary {
  background: #007bff;
}

.btn-primary:hover {
  background: #0069d9;
}

.btn-danger {
  background: #dc3545;
}

.btn-danger:hover {
  background: #c82333;
}

/* 表格样式 */
.table-container {
  background: #fff;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
  margin-bottom: 20px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
}

th, td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

th {
  background-color: #f2f2f2;
  font-weight: bold;
}

tr:hover {
  background-color: #f5f5f5;
}

/* 卡片样式 */
.card {
  background: #fff;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
  margin-bottom: 20px;
}

.card h3 {
  margin-bottom: 15px;
  color: #333;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 10px;
  }
  
  .header nav {
    flex-direction: column;
    gap: 5px;
  }
  
  table {
    font-size: 14px;
  }
  
  th, td {
    padding: 8px;
  }
}

/* 错误消息样式 */
.error-message {
  color: #dc3545;
  margin-bottom: 15px;
  padding: 10px;
  background: #f8d7da;
  border: 1px solid #f5c6cb;
  border-radius: 4px;
}

/* 成功消息样式 */
.success-message {
  color: #28a745;
  margin-bottom: 15px;
  padding: 10px;
  background: #d4edda;
  border: 1px solid #c3e6cb;
  border-radius: 4px;
}

/* 加载状态 */
.loading {
  text-align: center;
  padding: 20px;
  color: #666;
}

/* 搜索框样式 */
.search-box {
  margin-bottom: 20px;
  display: flex;
  gap: 10px;
}

.search-box input {
  flex: 1;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
}

/* 分页样式 */
.pagination {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  align-items: center;
  justify-content: center;
}

.pagination button {
  padding: 8px 16px;
  border: 1px solid #ddd;
  background: #fff;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
}

.pagination button:hover:not(:disabled) {
  background: #f8f9fa;
  border-color: #007bff;
}

.pagination button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.pagination span {
  padding: 8px 16px;
  color: #666;
}

.pagination button.active {
  background: #333;
  color: #fff;
}

/* 统计卡片样式 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.stat-card {
  background: #fff;
  padding: 20px;
  border-radius: 5px;
  box-shadow: 0 0 5px rgba(0,0,0,0.1);
  text-align: center;
}

.stat-card h4 {
  margin-bottom: 10px;
  color: #666;
}

.stat-card .value {
  font-size: 32px;
  font-weight: bold;
  color: #333;
}