/* ========================================
   CSS自定义属性（变量）定义
======================================== */

:root {
  /* 主色调 */
  --primary-color: #5B6AFF;
  --secondary-color: #8C54FF;
  --accent-color: #667EEA;
  
  /* 背景色 - 浅色模式 */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F7FA;
  --bg-card: #FFFFFF;
  --bg-hover: #F8FAFC;
  
  /* 文字颜色 - 浅色模式 */
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --text-inverse: #FFFFFF;
  
  /* 边框颜色 */
  --border-color: #E2E8F0;
  --border-hover: #CBD5E0;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.15);
  
  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  --gradient-card: linear-gradient(135deg, rgba(91, 106, 255, 0.1), rgba(140, 84, 255, 0.05));
  
  /* 间距基础单位 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  
  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* 字体大小 */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 32px;
  
  /* 布局尺寸 */
  --header-height: 60px;
  --sidebar-width: 240px;
  --sidebar-collapsed-width: 64px;
  
  /* 动画 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Z-index层级 */
  --z-dropdown: 1000;
  --z-sticky: 1010;
  --z-fixed: 1020;
  --z-modal-backdrop: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}

/* 深色模式变量 */
[data-theme="dark"] {
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-card: #1E293B;
  --bg-hover: #334155;
  
  --text-primary: #F8FAFC;
  --text-secondary: #CBD5E0;
  --text-muted: #94A3B8;
  
  --border-color: #334155;
  --border-hover: #475569;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.5);
}

/* ========================================
   全局重置和基础样式
======================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', system-ui, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}

/* 选中文本样式 */
::selection {
  background: rgba(91, 106, 255, 0.2);
  color: var(--text-primary);
}

/* ========================================
   顶部导航栏样式
======================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(20px);
  z-index: var(--z-fixed);
  transition: all var(--transition-normal);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 var(--spacing-lg);
  max-width: 1400px;
  margin: 0 auto;
}

/* Logo区域 */
.header-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-shrink: 0;
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-text h1 {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.logo-text span {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-weight: 400;
}

/* 搜索框 */
.search-container {
  flex: 1;
  max-width: 480px;
  margin: 0 var(--spacing-xl);
  position: relative;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0 var(--spacing-md);
  transition: all var(--transition-normal);
}

.search-box:focus-within {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(91, 106, 255, 0.1);
  background: var(--bg-card);
}

.search-icon {
  color: var(--text-muted);
  flex-shrink: 0;
}

.search-box input {
  flex: 1;
  border: none;
  background: transparent;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--text-base);
  color: var(--text-primary);
  outline: none;
}

.search-box input::placeholder {
  color: var(--text-muted);
}

.search-shortcut {
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: var(--bg-hover);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  flex-shrink: 0;
}

/* 搜索建议 */
.search-suggestions {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  margin-top: var(--spacing-xs);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-fast);
  z-index: var(--z-dropdown);
}

.search-suggestions.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* 右侧操作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-shrink: 0;
}

/* 主题切换按钮 */
.theme-toggle {
  position: relative;
  width: 40px;
  height: 40px;
  border: none;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  overflow: hidden;
}

.theme-toggle:hover {
  background: var(--bg-hover);
  transform: translateY(-1px);
}

.theme-toggle svg {
  position: absolute;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
}

.theme-toggle .sun-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.theme-toggle .moon-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0.8);
}

[data-theme="dark"] .theme-toggle .sun-icon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.8);
}

[data-theme="dark"] .theme-toggle .moon-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* 用户菜单 */
.user-avatar {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
}

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

.user-avatar svg {
  color: white;
}

/* ========================================
   主容器布局
======================================== */

.main-container {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
  padding-top: var(--header-height);
  transition: grid-template-columns var(--transition-normal);
}

/* ========================================
   左侧边栏样式
======================================== */

.sidebar {
  background: var(--bg-card);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  position: sticky;
  top: var(--header-height);
  height: calc(100vh - var(--header-height));
  transition: all var(--transition-normal);
}

.sidebar-content {
  padding: var(--spacing-lg);
  height: 100%;
  display: flex;
  flex-direction: column;
}

/* 分类导航 */
.category-nav {
  flex: 1;
}

.category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
}

.category-header h2 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.sidebar-toggle {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.sidebar-toggle:hover {
  background: var(--bg-hover);
}

.category-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.category-item {
  margin-bottom: var(--spacing-xs);
}

.category-link {
  display: flex;
  align-items: center;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-normal);
  gap: var(--spacing-md);
}

.category-link:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.category-item.active .category-link {
  background: var(--gradient-card);
  color: var(--primary-color);
  font-weight: 500;
}

.category-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.category-name {
  flex: 1;
  font-size: var(--text-sm);
}

.category-count {
  font-size: var(--text-xs);
  background: var(--bg-secondary);
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: 10px;
  font-weight: 500;
}

.category-item.active .category-count {
  background: rgba(91, 106, 255, 0.2);
  color: var(--primary-color);
}

/* 侧边栏底部 */
.sidebar-footer {
  margin-top: auto;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.quick-stats {
  display: flex;
  gap: var(--spacing-lg);
}

.stat-item {
  flex: 1;
  text-align: center;
}

.stat-number {
  display: block;
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--primary-color);
}

.stat-label {
  display: block;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: 2px;
}

/* ========================================
   主内容区样式
======================================== */

.main-content {
  padding: var(--spacing-xl);
  overflow-x: hidden;
}

/* 内容头部 */
.content-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.breadcrumb-item {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.content-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* 视图控制 */
.view-controls {
  display: flex;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 4px;
}

.view-btn {
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  color: var(--text-muted);
}

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

.view-btn.active {
  background: var(--bg-card);
  color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

/* 排序控制 */
.sort-select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.sort-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(91, 106, 255, 0.1);
}

/* ========================================
   工具卡片样式
======================================== */

.tools-container {
  position: relative;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.tool-card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  position: relative;
  overflow: hidden;
}

.card-icon svg {
  width: 24px;
  height: 24px;
  color: var(--primary-color);
  z-index: 1;
}

.card-icon::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(91, 106, 255, 0.1);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: all var(--transition-normal);
}

.tool-card:hover .card-icon::before {
  width: 100%;
  height: 100%;
}

.card-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--spacing-sm);
  line-height: 1.4;
}

.card-description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 0 0 var(--spacing-md);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
}

.card-tag {
  font-size: var(--text-xs);
  background: var(--bg-secondary);
  color: var(--text-muted);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.card-action {
  width: 100%;
  padding: var(--spacing-md);
  border: none;
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card-action::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left var(--transition-normal);
}

.card-action:hover::before {
  left: 100%;
}

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

/* ========================================
   加载和空状态
======================================== */

.loading-state {
  display: none;
}

.loading-state.show {
  display: block;
}

.loading-skeleton {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.skeleton-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

.skeleton-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(91, 106, 255, 0.1), transparent);
  animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

.skeleton-card::after {
  content: '';
  display: block;
  height: 200px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
}

.empty-state {
  text-align: center;
  padding: var(--spacing-xxl);
}

.empty-content {
  max-width: 400px;
  margin: 0 auto;
}

.empty-icon {
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
}

.empty-state h3 {
  font-size: var(--text-xl);
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.empty-state p {
  color: var(--text-secondary);
  font-size: var(--text-base);
}

/* ========================================
   分页控制
======================================== */

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.pagination-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  font-size: var(--text-sm);
}

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

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

.pagination-numbers {
  display: flex;
  gap: var(--spacing-xs);
}

/* ========================================
   模态框样式
======================================== */

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: var(--z-modal);
  padding: var(--spacing-lg);
}

.modal.show {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 600px;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

.modal.show .modal-content {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.modal-close {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  transition: all var(--transition-normal);
}

.modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.modal-body {
  padding: var(--spacing-lg);
}

/* ========================================
   移动端适配
======================================== */

.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: var(--z-modal-backdrop);
}

.sidebar-overlay.show {
  opacity: 1;
  visibility: visible;
}

/* ========================================
   响应式媒体查询
======================================== */

/* 平板端 */
@media (max-width: 1024px) {
  .tools-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
  }
  
  .main-content {
    padding: var(--spacing-lg);
  }
  
  .header-content {
    padding: 0 var(--spacing-md);
  }
  
  .search-container {
    margin: 0 var(--spacing-lg);
  }
}

/* 移动端 */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 280px;
  }
  
  .main-container {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    position: fixed;
    top: var(--header-height);
    left: -100%;
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    z-index: var(--z-modal);
    transition: left var(--transition-normal);
  }
  
  .sidebar.show {
    left: 0;
  }
  
  .header-content {
    padding: 0 var(--spacing-md);
  }
  
  .search-container {
    display: none;
  }
  
  .tools-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .main-content {
    padding: var(--spacing-md);
  }
  
  .content-header {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-md);
  }
  
  .content-controls {
    justify-content: space-between;
  }
  
  .category-header h2 {
    font-size: var(--text-base);
  }
  
  .modal {
    padding: var(--spacing-md);
  }
  
  .modal-content {
    max-height: 90vh;
  }
}

/* 超小屏幕 */
@media (max-width: 480px) {
  .header-content {
    padding: 0 var(--spacing-sm);
  }
  
  .header-logo .logo-text span {
    display: none;
  }
  
  .tools-grid {
    gap: var(--spacing-sm);
  }
  
  .tool-card {
    padding: var(--spacing-md);
  }
  
  .main-content {
    padding: var(--spacing-sm);
  }
}

/* ========================================
   打印样式
======================================== */

@media print {
  .header,
  .sidebar,
  .content-controls,
  .pagination {
    display: none;
  }
  
  .main-container {
    grid-template-columns: 1fr;
    padding-top: 0;
  }
  
  .main-content {
    padding: 0;
  }
  
  .tool-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ddd;
  }
}

/* ========================================
   可访问性增强
======================================== */

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  :root {
    --border-color: #000000;
    --text-muted: #666666;
  }
  
  [data-theme="dark"] {
    --border-color: #FFFFFF;
    --text-muted: #CCCCCC;
  }
}

/* 焦点可见性 */
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* ========================================
   工具提示样式
======================================== */

.tooltip {
  position: relative;
}

.tooltip::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-primary);
  color: var(--bg-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-fast);
  z-index: var(--z-tooltip);
  margin-bottom: var(--spacing-xs);
}

.tooltip:hover::before {
  opacity: 1;
  visibility: visible;
}

/* ========================================
   动画关键帧
======================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* ========================================
   搜索建议样式
======================================== */

.search-suggestion-item {
  display: flex;
  align-items: center;
  padding: var(--spacing-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
  gap: var(--spacing-md);
}

.search-suggestion-item:hover {
  background: var(--bg-hover);
}

.suggestion-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-card);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.suggestion-icon svg {
  width: 16px;
  height: 16px;
  color: var(--primary-color);
}

.suggestion-content {
  flex: 1;
}

.suggestion-name {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.suggestion-category {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* ========================================
   工具卡片徽章样式
======================================== */

.popular-badge,
.featured-badge {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
  z-index: 1;
}

.popular-badge {
  background: linear-gradient(135deg, #FF6B6B, #FF8E8E);
  color: white;
}

.featured-badge {
  background: linear-gradient(135deg, #4ECDC4, #44A08D);
  color: white;
}

.tool-rating {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 原创工具特殊样式 */
.original-badge {
  position: absolute;
  top: var(--spacing-md);
  left: var(--spacing-md);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
  background: linear-gradient(135deg, #FFD700, #FFA500);
  color: #8B4513;
  z-index: 1;
  border: 1px solid rgba(255, 215, 0, 0.3);
}

.tool-card.original {
  position: relative;
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.05), rgba(255, 165, 0, 0.02));
  border: 1px solid rgba(255, 215, 0, 0.2);
}

.tool-card.original::before {
  background: linear-gradient(135deg, #FFD700, #FFA500);
}

.tool-card.original:hover {
  box-shadow: 0 8px 32px rgba(255, 215, 0, 0.2);
  border-color: rgba(255, 215, 0, 0.4);
}

.tool-card.original .card-icon {
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.15), rgba(255, 165, 0, 0.1));
}

.tool-card.original .card-action {
  background: linear-gradient(135deg, #FFD700, #FFA500);
  color: #8B4513;
  font-weight: 600;
}

.tool-card.original .card-action:hover {
  box-shadow: 0 4px 16px rgba(255, 215, 0, 0.3);
}

/* ========================================
   模态框内容样式
======================================== */

.modal-tool-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.modal-tool-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
}

.modal-tool-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.modal-tool-icon svg {
  width: 24px;
  height: 24px;
  color: var(--primary-color);
}

.modal-tool-info {
  flex: 1;
}

.modal-tool-category {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: 4px;
}

.modal-tool-rating {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 4px;
}

.modal-tool-description h3,
.modal-tool-tags h3 {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.modal-tool-description p {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.6;
}

.modal-tags-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.modal-tag {
  font-size: var(--text-xs);
  background: var(--bg-secondary);
  color: var(--text-muted);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  font-weight: 500;
}

.modal-tool-actions {
  display: flex;
  gap: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.modal-action-primary {
  flex: 1;
  padding: var(--spacing-md);
  border: none;
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-action-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.modal-action-secondary {
  padding: var(--spacing-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.modal-action-secondary:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

/* ========================================
   原创工具模态框样式
======================================== */

.original-tool-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.original-tool-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.1), rgba(255, 165, 0, 0.05));
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 215, 0, 0.2);
}

.original-tool-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, rgba(255, 215, 0, 0.2), rgba(255, 165, 0, 0.1));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.original-tool-icon svg {
  width: 32px;
  height: 32px;
  color: #FFA500;
}

.original-tool-info {
  flex: 1;
}

.original-badge-large {
  display: inline-block;
  padding: 6px 12px;
  background: linear-gradient(135deg, #FFD700, #FFA500);
  color: #8B4513;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.original-tool-status {
  font-size: var(--text-base);
  color: var(--text-secondary);
  font-weight: 500;
}

.original-tool-preview h3 {
  font-size: var(--text-xl);
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.original-tool-preview p {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.feature-list h4,
.development-progress h4 {
  font-size: var(--text-lg);
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.feature-list ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.feature-list li {
  padding: var(--spacing-sm) 0;
  color: var(--text-secondary);
  position: relative;
  padding-left: var(--spacing-lg);
}

.feature-list li::before {
  content: '✨';
  position: absolute;
  left: 0;
  top: var(--spacing-sm);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: var(--spacing-sm);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(135deg, #FFD700, #FFA500);
  border-radius: 4px;
  transition: width var(--transition-normal);
}

.progress-text {
  font-size: var(--text-sm);
  color: var(--text-muted);
  font-weight: 500;
}

.original-tool-actions {
  display: flex;
  gap: var(--spacing-md);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.original-tool-actions .modal-action-primary {
  background: linear-gradient(135deg, #FFD700, #FFA500);
  color: #8B4513;
  border: none;
  font-weight: 600;
}

.original-tool-actions .modal-action-primary:hover {
  box-shadow: 0 4px 16px rgba(255, 215, 0, 0.3);
  transform: translateY(-1px);
}

/* ========================================
   列表视图样式
======================================== */

.tools-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.tools-list .tool-card {
  display: flex;
  align-items: center;
  padding: var(--spacing-lg);
  gap: var(--spacing-lg);
}

.tools-list .card-icon {
  width: 64px;
  height: 64px;
  flex-shrink: 0;
}

.tools-list .card-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.tools-list .card-title {
  margin: 0;
}

.tools-list .card-description {
  margin: 0;
  -webkit-line-clamp: 1;
}

.tools-list .card-tags {
  margin: 0;
}

.tools-list .card-action {
  width: auto;
  padding: var(--spacing-sm) var(--spacing-lg);
  flex-shrink: 0;
}

/* ========================================
   原创工具专门界面样式
======================================== */

.original-tools-interface {
  padding: var(--spacing-xl) 0;
  animation: fadeIn 0.5s ease;
}

.original-tools-header {
  text-align: center;
  margin-bottom: var(--spacing-xxl);
}

.original-tools-header h2 {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.original-tools-header p {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* 工具分类标签页 */
.tool-tabs {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xxl);
  flex-wrap: wrap;
}

.tool-tab {
  padding: var(--spacing-md) var(--spacing-xl);
  border: 2px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  border-radius: var(--radius-xl);
  font-size: var(--text-base);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.tool-tab:hover {
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.tool-tab.active {
  background: var(--gradient-primary);
  border-color: var(--primary-color);
  color: white;
  box-shadow: var(--shadow-lg);
}

/* 工具内容区域 */
.tool-content {
  position: relative;
  min-height: 400px;
}

.tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

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

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  padding: 0;
}

/* 工具项样式 */
.tool-item {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.tool-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.tool-item:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-color);
}

.tool-item:hover::before {
  opacity: 1;
}

.tool-item .tool-icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-card);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

.tool-item .tool-icon svg {
  width: 32px;
  height: 32px;
  color: var(--primary-color);
  z-index: 1;
  transition: transform var(--transition-normal);
}

.tool-item:hover .tool-icon svg {
  transform: scale(1.1);
}

.tool-item .tool-icon::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(91, 106, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: all var(--transition-normal);
}

.tool-item:hover .tool-icon::before {
  width: 100%;
  height: 100%;
}

.tool-item h3 {
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.tool-item p {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.tool-status {
  display: inline-block;
  padding: 6px 12px;
  background: linear-gradient(135deg, #FFD700, #FFA500);
  color: #8B4513;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
}

.tool-status.ready {
  background: linear-gradient(135deg, #10B981, #059669);
  color: white;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(16, 185, 129, 0);
  }
}

/* 响应式设计 */
@media (max-width: 768px) {
  .tool-tabs {
    gap: var(--spacing-xs);
  }
  
  .tool-tab {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--text-sm);
  }
  
  .tool-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .original-tools-header h2 {
    font-size: var(--text-2xl);
  }
  
  .original-tools-header p {
    font-size: var(--text-base);
  }
}

@media (max-width: 480px) {
  .tool-tabs {
    flex-direction: column;
    align-items: center;
  }
  
  .tool-tab {
    width: 100%;
    max-width: 200px;
  }
  
  .tool-item {
    padding: var(--spacing-lg);
  }
  
  .tool-item .tool-icon {
    width: 48px;
    height: 48px;
  }
  
  .tool-item .tool-icon svg {
    width: 24px;
    height: 24px;
  }
}

/* ========================================
   骨架屏动画增强
======================================== */

.skeleton-card {
  position: relative;
}

.skeleton-card::after {
  content: '';
  position: absolute;
  top: var(--spacing-lg);
  left: var(--spacing-lg);
  right: var(--spacing-lg);
  height: 48px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.skeleton-card::before {
  content: '';
  position: absolute;
  top: calc(var(--spacing-lg) + 48px + var(--spacing-md));
  left: var(--spacing-lg);
  right: var(--spacing-lg);
  height: 20px;
  background: var(--bg-secondary);
  border-radius: 4px;
  margin-bottom: var(--spacing-sm);
}

/* ========================================
   淡入动画类
======================================== */

.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

.slide-in-left {
  animation: slideInLeft 0.3s ease forwards;
}

.pulse {
  animation: pulse 2s infinite;
}

/* ========================================
   侧边栏收缩状态
======================================== */

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar.collapsed .category-name,
.sidebar.collapsed .category-count,
.sidebar.collapsed .sidebar-footer {
  display: none;
}

.sidebar.collapsed .category-header h2 {
  display: none;
}

.sidebar.collapsed .category-link {
  justify-content: center;
  padding: var(--spacing-md);
}

/* ========================================
   加载进度条
======================================== */

.loading-bar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-primary);
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  z-index: var(--z-fixed);
}

.loading-bar.show {
  animation: loadingProgress 2s ease-in-out infinite;
}

@keyframes loadingProgress {
  0% {
    transform: translateX(-100%);
  }
  50% {
    transform: translateX(0%);
  }
  100% {
    transform: translateX(100%);
  }
}