:root {
  --sidebar-width: 240px;
  --primary: #1a1a2e;
  --primary-light: #16213e;
  --accent: #0f3460;
  --accent-light: #e8f0fe;
  --border: #e8e8e8;
  --bg: #f8f9fb;
  --card-bg: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --danger: #ef4444;
  --success: #10b981;
  --warning: #f59e0b;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.1);
  --transition: 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #ffffff;
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ====== 登录 ====== */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
}

.login-card {
  background: #fff;
  border-radius: 16px;
  padding: 40px 36px;
  width: 380px;
  max-width: 92%;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}

.login-card .logo { text-align: center; margin-bottom: 32px; }
.login-card .logo h1 { font-size: 26px; font-weight: 700; color: var(--primary); letter-spacing: 3px; }
.login-card .logo p { color: var(--text-secondary); font-size: 13px; margin-top: 6px; }

.login-card .form-control {
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: 14px;
  transition: var(--transition);
}
.login-card .form-control:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(15,52,96,0.1); }
.login-card .btn-primary {
  height: 44px;
  background: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
  letter-spacing: 1px;
}
.login-card .btn-primary:hover { background: var(--primary-light); }

/* ====== 布局 ====== */
.admin-layout { display: flex; min-height: 100vh; }

/* ====== 侧边栏 ====== */
.sidebar {
  width: var(--sidebar-width);
  background: #ffffff;
  border-right: 1px solid var(--border);
  position: fixed;
  top: 0; left: 0;
  height: 100vh;
  z-index: 100;
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-header h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 2px;
  margin: 0;
}

.sidebar-header small {
  color: var(--text-muted);
  font-size: 11px;
  margin-top: 2px;
  display: block;
}

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

.sidebar-nav .nav-item {
  display: flex;
  align-items: center;
  padding: 10px 20px;
  margin: 2px 8px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  background: none;
  width: calc(100% - 16px);
  text-align: left;
  font-size: 14px;
  font-weight: 450;
}

.sidebar-nav .nav-item:hover {
  background: #f3f4f6;
  color: var(--primary);
}

.sidebar-nav .nav-item.active {
  background: var(--primary);
  color: #ffffff;
  font-weight: 500;
}

.sidebar-nav .nav-item i {
  margin-right: 10px;
  font-size: 17px;
  width: 20px;
  text-align: center;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-secondary);
}

.sidebar-footer a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 12px;
}
.sidebar-footer a:hover { color: var(--danger); }

/* ====== 主内容区 ====== */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 0;
  background: #ffffff;
  min-height: 100vh;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 32px;
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.top-bar h2 {
  font-size: 20px;
  font-weight: 600;
  color: var(--primary);
  margin: 0;
}

.page-content {
  padding: 28px 32px;
  background: var(--bg);
  min-height: calc(100vh - 69px);
}

/* ====== 统计卡片 ====== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px 22px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.stat-card .icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 12px;
}

.stat-card .number {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.stat-card .label {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ====== 表格 ====== */
.table {
  font-size: 13px;
  margin-bottom: 0;
}
.table > thead { border-bottom: 2px solid var(--border); }
.table > thead th {
  font-weight: 550;
  color: var(--text-secondary);
  text-transform: none;
  padding: 12px 14px;
  font-size: 12px;
  letter-spacing: 0.3px;
  background: transparent;
  border-bottom: none;
}
.table > tbody td {
  padding: 12px 14px;
  vertical-align: middle;
  border-bottom: 1px solid var(--border);
}
.table > tbody tr:hover { background: #f8f9fb; }

.product-thumb {
  width: 52px;
  height: 52px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.badge-hot {
  background: #fef3c7;
  color: #92400e;
  font-weight: 500;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
}

.badge-new {
  background: #d1fae5;
  color: #065f46;
  font-weight: 500;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
}

/* ====== 按钮 ====== */
.btn {
  font-size: 13px;
  font-weight: 450;
  border-radius: var(--radius-sm);
  padding: 7px 14px;
  transition: var(--transition);
}
.btn-sm { padding: 5px 10px; font-size: 12px; }

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

.btn-outline-primary {
  color: var(--accent);
  border-color: #cbd5e1;
}
.btn-outline-primary:hover { background: var(--accent-light); border-color: var(--accent); color: var(--accent); }

.btn-outline-secondary { color: var(--text-secondary); border-color: var(--border); }
.btn-outline-secondary:hover { background: #f3f4f6; color: var(--text); }
.btn-outline-danger { color: var(--danger); border-color: #fecaca; }
.btn-outline-danger:hover { background: #fef2f2; color: #dc2626; border-color: #fca5a5; }

/* ====== 表单 ====== */
.form-control, .form-select {
  font-size: 13px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  padding: 8px 12px;
  transition: var(--transition);
}
.form-control:focus, .form-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(15,52,96,0.08);
}
.form-control-sm, .form-select-sm {
  font-size: 12px;
  padding: 5px 10px;
  height: 34px;
}

label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 5px;
  display: block;
  letter-spacing: 0.2px;
}

/* ====== 卡片 ====== */
.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ====== 模态框 ====== */
.modal-content {
  border-radius: 14px;
  border: none;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.modal-header {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  border-radius: 14px 14px 0 0;
  padding: 18px 22px;
}

.modal-header h5 {
  font-size: 16px;
  font-weight: 600;
  color: var(--primary);
}

.modal-body { padding: 22px; }

.modal-footer {
  border-top: 1px solid var(--border);
  padding: 14px 22px;
}

/* ====== 上传区域 ====== */
.upload-area {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: #fafafa;
}

.upload-area:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

.upload-area i {
  font-size: 36px;
  color: var(--text-muted);
}

.upload-area p {
  margin: 8px 0 0;
  color: var(--text-muted);
  font-size: 13px;
}

/* ====== 图片预览网格 ====== */
.image-preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 8px;
  margin-top: 10px;
}

.image-preview-item {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 1;
  border: 1px solid var(--border);
  background: #f9fafb;
}

.image-preview-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-preview-item .remove-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(0,0,0,0.45);
  color: #fff;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
}

.image-preview-item .remove-btn:hover { background: var(--danger); }

/* ====== 轮播图卡片 ====== */
.banner-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 16px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  transition: var(--transition);
}

.banner-card:hover {
  box-shadow: var(--shadow-md);
}

.banner-card img {
  width: 180px;
  height: 90px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: #f3f4f6;
}

.banner-card .banner-info {
  flex: 1;
  min-width: 0;
}

.banner-card .banner-info h6 {
  font-size: 14px;
  font-weight: 550;
  color: var(--text);
  margin: 0 0 4px;
}

.banner-card .banner-info small {
  color: var(--text-muted);
  font-size: 12px;
}

.banner-card .banner-actions {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.status-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 500;
}
.status-badge.on { background: #d1fae5; color: #065f46; }
.status-badge.off { background: #f3f4f6; color: var(--text-muted); }

/* ====== Toast ====== */
.toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 99999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast-container .toast {
  animation: slideIn 0.25s ease;
  max-width: 380px;
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ====== 空状态 ====== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-state i {
  font-size: 48px;
  margin-bottom: 12px;
  display: block;
  opacity: 0.4;
}

.empty-state h5 { color: var(--text-secondary); margin-bottom: 6px; font-weight: 550; }
.empty-state p { font-size: 13px; }

/* ====== 分页 ====== */
.pagination .page-link {
  font-size: 13px;
  color: var(--text-secondary);
  border-color: var(--border);
  padding: 6px 12px;
  transition: var(--transition);
}
.pagination .page-item.active .page-link {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.pagination .page-link:hover { background: #f3f4f6; }

/* ====== 设置页 ====== */
.settings-form label {
  margin-top: 16px;
}

/* ====== 图片上传预览（行内） ====== */
.inline-upload-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.inline-upload-preview .preview-item {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  overflow: hidden;
  position: relative;
}

.inline-upload-preview .preview-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.inline-upload-preview .preview-item .del {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(0,0,0,0.45);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 10px;
  border: none;
}

.inline-upload-preview .add-btn {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-sm);
  border: 2px dashed var(--border);
  background: #fafafa;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  font-size: 20px;
  transition: var(--transition);
}
.inline-upload-preview .add-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }
.inline-upload-preview .add-btn span { font-size: 10px; margin-top: 2px; }

/* ====== 响应式 ====== */
@media (max-width: 768px) {
  .sidebar {
    width: 56px;
  }
  .sidebar-header h3, .sidebar-header small,
  .sidebar-nav .nav-item span, .sidebar-footer { display: none; }
  .sidebar-nav .nav-item { justify-content: center; padding: 10px; margin: 2px 4px; width: calc(100% - 8px); }
  .sidebar-nav .nav-item i { margin-right: 0; }
  .main-content { margin-left: 56px; }
  .top-bar { padding: 14px 16px; }
  .page-content { padding: 16px; }
}

/* ====== 链接类型选择器 ====== */
.link-type-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.link-type-row select { width: 140px; flex-shrink: 0; }
.link-type-row input { flex: 1; }

/* ====== 仪表盘快捷操作 ====== */
.quick-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.quick-action-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--card-bg);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  color: var(--text);
}

.quick-action-btn:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.quick-action-btn i {
  font-size: 24px;
  margin-bottom: 8px;
  color: var(--accent);
}

.quick-action-btn span {
  font-size: 12px;
  font-weight: 500;
}