/* 管理后台样式 */

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: #f5f5f5;
  color: #333;
}

/* 顶部导航 */
.navbar {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar h1 {
  font-size: 24px;
  font-weight: 600;
}

.navbar .nav-links {
  display: flex;
  gap: 20px;
}

.navbar .nav-links a {
  color: white;
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 6px;
  transition: background 0.3s;
}

.navbar .nav-links a:hover,
.navbar .nav-links a.active {
  background: rgba(255,255,255,0.2);
}

/* 主容器 */
.container {
  max-width: 1400px;
  margin: 30px auto;
  padding: 0 20px;
}

/* 统计卡片 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.stat-card {
  background: white;
  border-radius: 12px;
  padding: 25px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  display: flex;
  align-items: center;
  gap: 20px;
}

.stat-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
}

.stat-icon.videos { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.stat-icon.stores { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.stat-icon.categories { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.stat-icon.consult { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }

.stat-info h3 {
  font-size: 28px;
  font-weight: 700;
  color: #333;
}

.stat-info p {
  font-size: 14px;
  color: #666;
  margin-top: 5px;
}

/* 内容卡片 */
.card {
  background: white;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  margin-bottom: 30px;
  overflow: hidden;
}

.card-header {
  padding: 20px 25px;
  border-bottom: 1px solid #eee;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: #333;
}

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-success {
  background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  color: white;
}

.btn-danger {
  background: linear-gradient(135deg, #f5576c 0%, #ff6b6b 100%);
  color: white;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

/* 表格 */
.table-responsive {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  padding: 15px 20px;
  text-align: left;
  border-bottom: 1px solid #eee;
}

th {
  background: #f8f9fa;
  font-weight: 600;
  color: #666;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

tr:hover {
  background: #f8f9fa;
}

.actions {
  display: flex;
  gap: 8px;
}

/* 模态框 */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: white;
  border-radius: 12px;
  width: 90%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.modal-header {
  padding: 20px 25px;
  border-bottom: 1px solid #eee;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-size: 18px;
  font-weight: 600;
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: #666;
  padding: 5px;
  line-height: 1;
}

.modal-body {
  padding: 25px;
}

.modal-footer {
  padding: 15px 25px;
  border-top: 1px solid #eee;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

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

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: #333;
  font-size: 14px;
}

.form-control {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 14px;
  transition: border-color 0.3s;
}

.form-control:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 15px center;
  padding-right: 40px;
}

textarea.form-control {
  min-height: 100px;
  resize: vertical;
}

/* 状态标签 */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.badge-success {
  background: #d4edda;
  color: #155724;
}

.badge-warning {
  background: #fff3cd;
  color: #856404;
}

.badge-danger {
  background: #f8d7da;
  color: #721c24;
}

.badge-primary {
  background: #cce5ff;
  color: #004085;
}

/* 提示消息 */
.alert {
  padding: 15px 20px;
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 14px;
}

.alert-success {
  background: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.alert-error {
  background: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

/* 加载中 */
.loading {
  text-align: center;
  padding: 40px;
  color: #666;
}

.loading::after {
  content: '';
  display: inline-block;
  width: 30px;
  height: 30px;
  border: 3px solid #ddd;
  border-top-color: #667eea;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-left: 10px;
  vertical-align: middle;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 响应式 */
@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    gap: 15px;
    padding: 15px;
  }
  
  .navbar .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  th, td {
    padding: 10px;
    font-size: 13px;
  }
  
  .actions {
    flex-direction: column;
  }
}

/* 教程标签页 */
.tutorial-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  border-bottom: 2px solid #eee;
  padding-bottom: 15px;
}

.tab-btn {
  padding: 10px 20px;
  border: none;
  background: #f5f5f5;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: #666;
  transition: all 0.3s;
}

.tab-btn:hover {
  background: #e8e8e8;
}

.tab-btn.active {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.tutorial-content {
  display: none;
}

.tutorial-content.active {
  display: block;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.section-header h3 {
  font-size: 18px;
  font-weight: 600;
  color: #333;
}