/* CSS 自定义属性 */
:root {
  /* 主色调 */
  --primary-color: #5B6AFF;
  --secondary-color: #8C54FF;
  --accent-color: #667EEA;
  
  /* 背景色 */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F5F7FA;
  --bg-card: #FFFFFF;
  
  /* 文字颜色 */
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  
  /* 边框和阴影 */
  --border-color: #E5E7EB;
  --shadow-light: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-medium: 0 8px 24px rgba(0,0,0,0.12);
  
  /* 间距 */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  
  /* 圆角 */
  --radius: 12px;
  
  /* 动画 */
  --transition: all 0.3s ease;
}

/* 暗色主题 */
[data-theme="dark"] {
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-card: #2d2d2d;
  --text-primary: #ffffff;
  --text-secondary: #cccccc;
  --text-muted: #888888;
  --border-color: #404040;
  --shadow-light: 0 4px 12px rgba(0,0,0,0.3);
  --shadow-medium: 0 8px 24px rgba(0,0,0,0.4);
}

/* 基础样式重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: var(--transition);
}

/* 顶部导航栏 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 60px;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-md);
  z-index: 1000;
  box-shadow: var(--shadow-light);
}

.header-left {
  display: flex;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 600;
  font-size: 18px;
  color: var(--primary-color);
}

.logo-icon {
  font-size: 24px;
}

.header-center {
  flex: 1;
  max-width: 500px;
  margin: 0 var(--spacing-md);
}

.search-container {
  position: relative;
  width: 100%;
}

.search-input {
  width: 100%;
  height: 40px;
  padding: 0 var(--spacing-sm) 0 var(--spacing-lg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 14px;
  transition: var(--transition);
}

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

.search-btn {
  position: absolute;
  left: var(--spacing-xs);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
}

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

.theme-toggle {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius);
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle:hover {
  background-color: var(--border-color);
}

.moon-icon {
  display: none;
}

[data-theme="dark"] .sun-icon {
  display: none;
}

[data-theme="dark"] .moon-icon {
  display: block;
}

/* 主容器 */
.main-container {
  display: grid;
  grid-template-columns: 240px 1fr;
  margin-top: 60px;
  min-height: calc(100vh - 60px);
}

/* 侧边栏 */
.sidebar {
  background-color: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  padding: var(--spacing-md);
  overflow-y: auto;
}

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

.sidebar-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
}

.nav-list {
  list-style: none;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 4px;
}

.nav-item:hover {
  background-color: var(--bg-secondary);
}

.nav-item.active {
  background-color: var(--primary-color);
  color: white;
}

.nav-icon {
  font-size: 16px;
  width: 20px;
  text-align: center;
}

.nav-text {
  flex: 1;
  font-size: 14px;
}

.nav-count {
  background-color: var(--bg-secondary);
  color: var(--text-muted);
  font-size: 12px;
  padding: 2px 6px;
  border-radius: 10px;
  min-width: 20px;
  text-align: center;
}

.nav-item.active .nav-count {
  background-color: rgba(255, 255, 255, 0.2);
  color: white;
}

/* 主内容区 */
.main-content {
  padding: var(--spacing-md);
  overflow-y: auto;
}

.content-header {
  margin-bottom: var(--spacing-md);
}

.content-header h1 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.content-meta {
  color: var(--text-secondary);
  font-size: 14px;
}

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

/* 工具卡片 */
.tool-card {
  background-color: var(--bg-card);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-light);
  transition: var(--transition);
  cursor: pointer;
  border: 1px solid var(--border-color);
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
}

.tool-card:active {
  transform: translateY(-2px) scale(0.98);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.card-description {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.5;
  margin-bottom: var(--spacing-sm);
}

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

.card-tag {
  background-color: var(--bg-secondary);
  color: var(--text-muted);
  font-size: 12px;
  padding: 4px 8px;
  border-radius: 6px;
}

.card-action {
  width: 100%;
  height: 36px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.card-action:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* 原创工具样式 */
.original-tool {
  border: 2px solid var(--primary-color);
  position: relative;
}

.original-tool::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--radius);
  z-index: -1;
  opacity: 0.1;
}

.original-badge {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  font-size: 10px;
  padding: 2px 6px;
  border-radius: 8px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.card-author {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: var(--spacing-xs);
  font-style: italic;
}

.original-tool .card-action {
  background: linear-gradient(135deg, #FF6B6B, #FF8E53);
}

.original-tool .card-action:hover {
  background: linear-gradient(135deg, #FF5252, #FF7043);
}

/* 骨架屏 */
.skeleton-card {
  background-color: var(--bg-card);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-light);
  border: 1px solid var(--border-color);
}

.skeleton-card::before {
  content: '';
  display: block;
  width: 48px;
  height: 48px;
  background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--border-color) 50%, var(--bg-secondary) 75%);
  background-size: 200% 100%;
  border-radius: var(--radius);
  margin-bottom: var(--spacing-sm);
  animation: skeleton-loading 1.5s infinite;
}

.skeleton-card::after {
  content: '';
  display: block;
  width: 100%;
  height: 80px;
  background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--border-color) 50%, var(--bg-secondary) 75%);
  background-size: 200% 100%;
  border-radius: 4px;
  animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md);
  color: var(--text-secondary);
}

.empty-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-sm);
}

.empty-state h3 {
  font-size: 18px;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

/* 移动端遮罩 */
.mobile-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 999;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .main-container {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    position: fixed;
    top: 60px;
    left: -240px;
    width: 240px;
    height: calc(100vh - 60px);
    z-index: 1001;
    transition: var(--transition);
  }
  
  .sidebar.open {
    left: 0;
  }
  
  .mobile-overlay.show {
    display: block;
  }
  
  .sidebar-toggle {
    display: block;
  }
  
  .header-center {
    margin: 0 var(--spacing-sm);
  }
  
  .tools-grid {
    grid-template-columns: 1fr;
  }
  
  .content-header h1 {
    font-size: 24px;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1025px) {
  .tools-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
}

@media (min-width: 1400px) {
  .tools-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

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

/* 焦点样式 */
.nav-item:focus,
.tool-card:focus,
.search-input:focus,
.theme-toggle:focus,
.card-action:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}