/* ===== CSS自定义属性 (CSS Variables) ===== */
:root {
  /* 主色调 - 多巴胺配色 */
  --primary-color: #FF4081; /* 活力粉 */
  --secondary-color: #00E5FF; /* 亮青色 */
  --accent-color: #FFEA00; /* 柠檬黄 */
  
  /* 背景色 */
  --bg-primary: #FFFFFF;
  --bg-secondary: #FFF0F5; /* 浅粉色背景，增加氛围 */
  --bg-card: #FFFFFF;
  --bg-hover: #E0F7FA; /* 浅青色悬停 */
  
  /* 文字颜色 */
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --text-inverse: #FFFFFF;
  
  /* 边框颜色 */
  --border-color: #E5E7EB;
  --border-hover: #D1D5DB;
  
  /* 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-hover: 0 8px 32px rgba(91, 106, 255, 0.15);
  
  /* 间距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  
  /* 圆角 */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* 动画 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* 布局尺寸 */
  --header-height: 60px;
  --sidebar-width: 240px;
  --sidebar-collapsed-width: 60px;
}

/* 暗色主题 */
[data-theme="dark"] {
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-card: #1E293B;
  --bg-hover: #334155;
  
  --text-primary: #F1F5F9;
  --text-secondary: #CBD5E1;
  --text-muted: #64748B;
  
  --border-color: #334155;
  --border-hover: #475569;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* ===== 基础重置和全局样式 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 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;
}

.particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

/* ===== 顶部导航栏 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  z-index: 1000;
  transition: all var(--transition-normal);
}

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

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-shrink: 0;
}

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

.brand-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

/* 搜索框 */
.search-container {
  flex: 1;
  max-width: 500px;
  margin: 0 var(--spacing-xl);
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: var(--spacing-md);
  color: var(--text-muted);
  pointer-events: none;
  z-index: 1;
}

#searchInput {
  width: 100%;
  height: 40px;
  padding: 0 var(--spacing-xl) 0 48px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

#searchInput:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(91, 106, 255, 0.1);
  background-color: var(--bg-card);
}

#searchInput::placeholder {
  color: var(--text-muted);
}

.search-clear {
  position: absolute;
  right: var(--spacing-md);
  width: 24px;
  height: 24px;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: none;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.search-clear:hover {
  background-color: var(--bg-hover);
  color: var(--text-secondary);
}

.search-clear.show {
  display: flex;
}

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

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

.theme-toggle:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.theme-icon {
  transition: all var(--transition-fast);
}

.theme-icon-dark {
  display: none;
}

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

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

/* 移动端菜单按钮 */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background-color: var(--bg-hover);
}

.mobile-menu-toggle span {
  width: 20px;
  height: 2px;
  background-color: var(--text-secondary);
  margin: 2px 0;
  transition: all var(--transition-fast);
  border-radius: 1px;
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* ===== 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);
}

/* ===== 侧边栏 ===== */
.sidebar {
  background-color: var(--bg-card);
  border-right: 1px solid var(--border-color);
  padding: var(--spacing-lg) 0;
  overflow-y: auto;
  transition: all var(--transition-normal);
}

.sidebar-nav {
  padding: 0 var(--spacing-md);
}

.nav-section-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
  padding: 0 var(--spacing-md);
}

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

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

.nav-link {
  display: flex;
  align-items: center;
  width: 100%;
  padding: var(--spacing-md);
  border: none;
  background: none;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.875rem;
  font-weight: 500;
}

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

.nav-link.active {
  background-color: var(--primary-color);
  color: var(--text-inverse);
}

.nav-icon {
  margin-right: var(--spacing-md);
  flex-shrink: 0;
}

.nav-text {
  flex: 1;
  text-align: left;
}

.nav-count {
  font-size: 0.75rem;
  background-color: var(--bg-secondary);
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: var(--radius-full);
  min-width: 20px;
  text-align: center;
  transition: all var(--transition-fast);
}

.nav-link.active .nav-count {
  background-color: rgba(255, 255, 255, 0.2);
  color: var(--text-inverse);
}

/* ===== 主内容区 ===== */
.content-area {
  padding: var(--spacing-xl);
  overflow-y: auto;
  background-color: var(--bg-secondary);
}

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

.content-title-section {
  flex: 1;
}

.content-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.content-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
}

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

.view-toggle {
  display: flex;
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 4px;
  border: 1px solid var(--border-color);
}

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

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

.view-btn.active {
  background-color: var(--primary-color);
  color: var(--text-inverse);
}

/* ===== 工具网格 ===== */
.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);
}

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

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

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

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  color: var(--text-inverse);
  font-size: 1.5rem;
  font-weight: 600;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.card-description {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 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-sm);
  margin-bottom: var(--spacing-lg);
}

.card-tag {
  font-size: 0.75rem;
  padding: 4px 8px;
  background-color: var(--bg-secondary);
  color: var(--text-muted);
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.card-action {
  width: 100%;
  padding: var(--spacing-md);
  border: none;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--text-inverse);
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.875rem;
}

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

.card-action:active {
  transform: translateY(0);
}

/* 原创工具样式 */
.custom-tool {
  position: relative;
  border: 2px solid var(--primary-color);
  background: linear-gradient(135deg, rgba(91, 106, 255, 0.05), rgba(140, 84, 255, 0.05));
}

.custom-tool:hover {
  border-color: var(--secondary-color);
  box-shadow: 0 8px 32px rgba(91, 106, 255, 0.2);
}

.custom-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--text-inverse);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: var(--radius-full);
  z-index: 2;
  box-shadow: var(--shadow-sm);
}

.custom-tool .card-icon {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  box-shadow: 0 4px 16px rgba(91, 106, 255, 0.3);
}

.custom-tool .card-action {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  box-shadow: 0 4px 16px rgba(91, 106, 255, 0.2);
}

.custom-tool .card-action:hover {
  box-shadow: 0 6px 20px rgba(91, 106, 255, 0.3);
}

/* 列表视图样式 */
.tools-grid.list-view {
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

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

.tools-grid.list-view .card-icon {
  margin-bottom: 0;
  flex-shrink: 0;
}

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

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

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

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

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

/* ===== 状态页面 ===== */
.loading-state,
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  text-align: center;
  color: var(--text-muted);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--spacing-lg);
}

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

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

.empty-state h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.empty-state p {
  color: var(--text-muted);
}

/* ===== 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;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.mobile-overlay.show {
  display: block;
  opacity: 1;
}

/* ===== 响应式设计 ===== */

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

/* 移动端 */
@media (max-width: 768px) {
  .main-container {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    transform: translateX(-100%);
    z-index: 1000;
    transition: transform var(--transition-normal);
  }
  
  .sidebar.show {
    transform: translateX(0);
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .header-container {
    padding: 0 var(--spacing-md);
  }
  
  .search-container {
    display: none;
  }
  
  .brand-title {
    font-size: 1.125rem;
  }
  
  .content-area {
    padding: var(--spacing-md);
  }
  
  .content-title {
    font-size: 1.5rem;
  }
  
  .tools-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .tool-card {
    padding: var(--spacing-md);
  }
  
  .view-toggle {
    display: none;
  }
}

/* 超小屏幕 */
@media (max-width: 480px) {
  .header-container {
    padding: 0 var(--spacing-sm);
  }
  
  .content-area {
    padding: var(--spacing-sm);
  }
  
  .tool-card {
    padding: var(--spacing-md);
  }
  
  .card-icon {
    width: 40px;
    height: 40px;
    font-size: 1.25rem;
  }
  
  .card-title {
    font-size: 1rem;
  }
  
  .card-description {
    font-size: 0.8rem;
  }
}

/* ===== 无障碍和键盘导航 ===== */
.nav-link:focus,
.theme-toggle:focus,
.view-btn:focus,
.card-action:focus,
#searchInput:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* 减少动画（用户偏好） */
@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: #000000;
  }
  
  [data-theme="dark"] {
    --border-color: #FFFFFF;
    --text-muted: #FFFFFF;
  }
}

/* 打印样式 */
@media print {
  .header,
  .sidebar,
  .mobile-overlay {
    display: none !important;
  }
  
  .main-container {
    grid-template-columns: 1fr;
    padding-top: 0;
  }
  
  .content-area {
    padding: 0;
    background-color: white;
  }
  
  .tool-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}

/* ===== 页脚样式 ===== */
.app-footer {
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
  /* Fixed positioning */
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  /* Add backdrop blur for better visibility over content */
  backdrop-filter: blur(10px);
  /* Ensure it has a subtle shadow to separate from content */
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.footer-text {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

/* Ensure content is not hidden behind the fixed footer */
body {
  padding-bottom: 80px; /* Approximate height of footer */
}