:root {
  --primary: #667eea;
  --primary-dark: #5568d3;
  --secondary: #764ba2;
  --success: #48bb78;
  --warning: #ed8936;
  --danger: #f56565;
  --info: #4299e1;
  --dark: #1a202c;
  --light: #f7fafc;
  --border-radius: 12px;
  --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: var(--dark);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

/* 顶部导航栏 */
.navbar {
  background: white;
  padding: 15px 30px;
  box-shadow: var(--box-shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar-brand {
  font-size: 24px;
  font-weight: bold;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.navbar-menu {
  display: flex;
  gap: 30px;
  list-style: none;
}

.navbar-menu a {
  text-decoration: none;
  color: var(--dark);
  font-weight: 500;
  transition: var(--transition);
}

.navbar-menu a:hover {
  color: var(--primary);
}

.navbar-user {
  display: flex;
  align-items: center;
  gap: 15px;
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: bold;
}

/* 侧边栏 */
.sidebar {
  background: white;
  border-radius: var(--border-radius);
  padding: 20px;
  box-shadow: var(--box-shadow);
  width: 250px;
  position: fixed;
  height: calc(100vh - 100px);
  overflow-y: auto;
}

.sidebar-menu {
  list-style: none;
}

.sidebar-menu li {
  margin-bottom: 10px;
}

.sidebar-menu a {
  display: block;
  padding: 12px 15px;
  text-decoration: none;
  color: var(--dark);
  border-radius: 8px;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 10px;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
}

/* 主内容区 */
.main-content {
  margin-left: 280px;
  padding: 30px;
}

/* 卡片组件 */
.card {
  background: white;
  border-radius: 20px;
  padding: 25px;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
  margin-bottom: 20px;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.card-header {
  font-size: 20px;
  font-weight: bold;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-body {
  color: #555;
  line-height: 1.6;
}

/* 按钮组件 */
.btn {
  padding: 12px 30px;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-warning {
  background: var(--warning);
  color: white;
}

.btn-danger {
  background: var(--danger);
  color: white;
}

.btn-secondary {
  background: #e2e8f0;
  color: var(--dark);
}

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

.form-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--dark);
}

.form-control {
  width: 100%;
  padding: 12px 15px;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  font-size: 16px;
  transition: var(--transition);
}

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

textarea.form-control {
  resize: vertical;
  min-height: 120px;
}

/* 网格布局 */
.grid {
  display: grid;
  gap: 20px;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* 徽章 */
.badge {
  display: inline-block;
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.badge-primary {
  background: var(--primary);
  color: white;
}

.badge-success {
  background: var(--success);
  color: white;
}

.badge-warning {
  background: var(--warning);
  color: white;
}

.badge-danger {
  background: var(--danger);
  color: white;
}

.badge-info {
  background: #4299e1;
  color: white;
}

.badge-secondary {
  background: #718096;
  color: white;
}


/* 进度条 */
.progress {
  height: 20px;
  background: #e2e8f0;
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 10px;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  transition: width 0.5s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 12px;
  font-weight: 600;
}

/* 表格 */
.table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
}

.table th {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  padding: 15px;
  text-align: left;
  font-weight: 600;
}

.table td {
  padding: 15px;
  border-bottom: 1px solid #e2e8f0;
}

.table tbody tr:hover {
  background: #f7fafc;
}

/* 加载动画 */
.loading {
  display: inline-block;
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  flex-direction: column;
  gap: 20px;
}

.loading-text {
  color: white;
  font-size: 18px;
  font-weight: 600;
}

/* 响应式设计 */
@media (max-width: 1199px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .sidebar {
    position: static;
    width: 100%;
    height: auto;
    margin-bottom: 20px;
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .navbar-menu {
    display: none;
  }
}

/* 工具类 */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-10 { gap: 10px; }
.gap-20 { gap: 20px; }