/* ========================================
   管理后台样式
   ======================================== */

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

:root {
  --primary: #1a73e8;
  --primary-dark: #1557b0;
  --success: #34c759;
  --warning: #ff9500;
  --danger: #ff3b30;
  --bg: #f0f2f5;
  --sidebar-bg: #001529;
  --card-bg: #fff;
  --text: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --border: #e8eaed;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --radius: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  min-height: 100vh;
}

/* ========== 侧边栏 ========== */
.sidebar {
  width: 240px;
  background: var(--sidebar-bg);
  color: #fff;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  transition: transform 0.3s;
}

.sidebar.collapsed {
  transform: translateX(-240px);
}

.sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 {
  font-size: 18px;
  font-weight: 600;
}

.version {
  font-size: 12px;
  opacity: 0.5;
  margin-top: 4px;
  display: block;
}

.sidebar-nav {
  flex: 1;
  padding: 12px 0;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 12px 24px;
  color: rgba(255,255,255,0.65);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.nav-item:hover {
  color: #fff;
  background: rgba(255,255,255,0.08);
}

.nav-item.active {
  color: #fff;
  background: var(--primary);
  border-left-color: #fff;
}

.nav-icon {
  margin-right: 12px;
  font-size: 18px;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.user-info {
  display: flex;
  align-items: center;
  margin-bottom: 12px;
}

.user-avatar {
  font-size: 24px;
  margin-right: 10px;
}

.user-name {
  font-size: 14px;
  color: rgba(255,255,255,0.85);
}

.btn-logout {
  width: 100%;
  padding: 8px;
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.65);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
}

.btn-logout:hover {
  background: rgba(255,255,255,0.2);
  color: #fff;
}

/* ========== 主内容 ========== */
.main-content {
  flex: 1;
  margin-left: 240px;
  min-height: 100vh;
  transition: margin-left 0.3s;
}

.main-content.expanded {
  margin-left: 0;
}

/* 顶部栏 */
.topbar {
  background: #fff;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.btn-toggle-sidebar {
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--text-secondary);
  margin-right: 16px;
  padding: 4px 8px;
}

.btn-toggle-sidebar:hover {
  color: var(--primary);
}

.topbar-title {
  font-size: 18px;
  font-weight: 600;
  flex: 1;
}

.topbar-actions {
  display: flex;
  align-items: center;
}

.current-time {
  font-size: 13px;
  color: var(--text-muted);
}

/* 页面容器 */
.page-container {
  padding: 24px;
}

/* ========== 通用组件 ========== */

/* 卡片 */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}

.card-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-header h3 {
  font-size: 16px;
  font-weight: 600;
}

.card-body {
  padding: 24px;
}

/* 按钮 */
.btn {
  padding: 8px 20px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  background: #fff;
  color: var(--text);
}

.btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  color: #fff;
}

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

.btn-danger:hover {
  background: var(--danger);
  color: #fff;
}

.btn-success {
  background: var(--success);
  color: #fff;
  border-color: var(--success);
}

.btn-sm {
  padding: 4px 12px;
  font-size: 12px;
}

.btn-group {
  display: flex;
  gap: 8px;
}

/* 表单 */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-input, .form-select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.form-input:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,115,232,0.1);
}

.form-inline {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.form-inline .form-group {
  margin-bottom: 0;
}

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

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

table th, table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

table th {
  background: #fafafa;
  font-weight: 600;
  color: var(--text-secondary);
  white-space: nowrap;
}

table tbody tr:hover {
  background: #f8f9ff;
}

/* 标签 */
.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.tag-success { background: #e8f5e9; color: #2e7d32; }
.tag-warning { background: #fff3e0; color: #e65100; }
.tag-danger  { background: #ffebee; color: #c62828; }
.tag-info    { background: #e3f2fd; color: #1565c0; }
.tag-admin   { background: #fff3e0; color: #e65100; }

/* 分页 */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 20px 0;
}

.pagination button {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  font-size: 13px;
}

.pagination button:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.pagination button.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.pagination button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.pagination .page-info {
  font-size: 13px;
  color: var(--text-muted);
}

/* 统计卡片网格 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  text-align: center;
}

.stat-card .stat-value {
  font-size: 36px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}

.stat-card .stat-label {
  font-size: 14px;
  color: var(--text-muted);
}

/* 弹窗 */
.modal {
  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: 1000;
}

.modal.hidden {
  display: none;
}

.modal-dialog {
  background: #fff;
  border-radius: 12px;
  width: 460px;
  max-width: 90vw;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.modal-header {
  padding: 20px 24px 0;
}

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

.modal-body {
  padding: 20px 24px;
}

.modal-footer {
  padding: 0 24px 20px;
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* 提示信息 */
.form-hint {
  margin-top: 12px;
  padding: 12px;
  background: #fffbe6;
  border: 1px solid #ffe58f;
  border-radius: 6px;
  font-size: 13px;
  color: #ad6800;
  line-height: 1.6;
}

/* 加载 */
.loading {
  text-align: center;
  padding: 60px 0;
  color: var(--text-muted);
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 60px 0;
  color: var(--text-muted);
}

.empty-state .empty-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

/* Toast */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 24px;
  border-radius: 6px;
  color: #fff;
  font-size: 14px;
  z-index: 2000;
  animation: slideDown 0.3s ease;
}

.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-info { background: var(--primary); }

@keyframes slideDown {
  from { transform: translateX(-50%) translateY(-20px); opacity: 0; }
  to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

/* 响应式 */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-240px);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .form-inline {
    flex-direction: column;
  }
}