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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    padding-top: 60px; /* 为固定的顶部导航留出空间 */
    padding-left: 220px; /* 为左侧导航留出空间 */
}

body.dark-mode {
    background-color: #1a1a1a;
    color: #f5f5f5;
}

/* 左侧导航栏样式 */
.sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    bottom: 0;
    width: 220px;
    background: white;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
    z-index: 999;
    transition: transform 0.3s ease;
    overflow-y: auto;
}

body.dark-mode .sidebar {
    background: #2d2d2d;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.3);
}

/* 侧边栏隐藏状态 */
body.sidebar-hidden {
    padding-left: 60px;
}

body.sidebar-hidden .sidebar {
    transform: translateX(-160px);
    width: 60px; /* 折叠时只保留图标宽度 */
}

/* 侧边栏隐藏时只显示大类图标 */
body.sidebar-hidden .sidebar-nav {
    padding: 10px 0;
}

body.sidebar-hidden .sidebar-nav-item {
    justify-content: center;
    padding: 12px 0;
    transition: all 0.3s ease;
    border-left: none !important;
}

body.sidebar-hidden .sidebar-nav-item:hover {
    background-color: rgba(102, 126, 234, 0.1);
    transform: scale(1.05);
}

body.dark-mode .sidebar-hidden .sidebar-nav-item:hover {
    background-color: rgba(129, 140, 248, 0.2);
}

body.sidebar-hidden .sidebar-nav-item span:not(.sidebar-nav-item-icon) {
    display: none !important;
}

/* 侧边栏隐藏时的图标优化 - 确保正确显示大类功能图标 */
body.sidebar-hidden .sidebar-nav-item-icon {
    display: flex !important;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    width: 40px;
    height: 40px;
    margin: 0 auto;
    transform: scale(1.1);
    transition: all 0.3s ease;
    z-index: 1000;
    position: relative;
    background: none !important;
    border: none !important;
    box-shadow: none !important;
}

body.sidebar-hidden .sidebar-nav-item {
    display: flex !important;
    justify-content: center;
    padding: 12px 0;
    transition: all 0.3s ease;
    border-left: none !important;
    min-height: 60px;
    align-items: center;
}

body.sidebar-hidden .sidebar-nav {
    display: block !important;
    padding: 10px 0;
}

body.sidebar-hidden .sidebar-nav-item:hover .sidebar-nav-item-icon {
    transform: scale(1.2);
    color: #667eea;
}

body.dark-mode .sidebar-hidden .sidebar-nav-item:hover .sidebar-nav-item-icon {
    color: #818cf8;
}

/* 侧边栏折叠/展开按钮样式调整 */
.sidebar-toggle {
    position: fixed;
    top: 75px;
    left: 200px;
    width: 28px;
    height: 50px;
    background-color: #e0e0e0;
    color: #666;
    border: none;
    border-radius: 0 10px 10px 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    z-index: 1001;
    transition: all 0.3s ease;
    box-shadow: 1px 1px 5px rgba(0, 0, 0, 0.1);
}

body.sidebar-hidden .sidebar-toggle {
    left: 40px;
    border-radius: 0 10px 10px 0;
}

/* 侧边栏导航项样式 */
.sidebar-nav {
    padding: 20px 0;
    transition: padding 0.3s ease;
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px 20px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    position: relative;
    border-left: 4px solid transparent;
}

.sidebar-nav-item-icon {
    font-size: 1.2rem;
    display: inline-block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 10px 20px 20px;
}

/* 固定的顶部导航 */
.header-fixed {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 10px 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: flex;
    align-items: center;
    height: 60px;
}

body.dark-mode .header-fixed {
    background: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
    white-space: nowrap;
}

/* 深色模式切换按钮 - 放到最右侧 */
#darkModeToggle {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    width: 35px;
    height: 35px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    color: white;
    flex-shrink: 0;
}

#darkModeToggle:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
}

body.dark-mode #darkModeToggle {
    background: rgba(255, 255, 255, 0.1);
}

body.dark-mode #darkModeToggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* 导航路径 */
.breadcrumb {
    margin: 10px 0;
    font-size: 0.9rem;
    color: #666;
}

body.dark-mode .breadcrumb {
    color: #aaa;
}

.breadcrumb a {
    color: #667eea;
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

.breadcrumb-separator {
    margin: 0 8px;
}

/* 主包装器 */
.main-wrapper {
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 80px);
    width: 100%;
}

/* 主内容区域 - 合并导航和工具合集 */
.main-content {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    align-items: stretch;
}

/* 右侧内容区域样式 */
.content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* 工具分类导航 - 新的顶部布局 */
.category-nav {
    display: flex;
    flex-direction: row;
    gap: 12px;
    padding: 15px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
    overflow-x: auto;
    white-space: nowrap;
}

/* 分类导航项样式 - 适应水平布局 */
.category-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 100px;
    padding: 12px 8px;
    background: #f0f0f0;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    color: #333;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

/* 修复之前的嵌套样式问题 */
body.dark-mode .category-nav-item {
    background: #444 !important;
    color: #f5f5f5 !important;
}

body.dark-mode .category-nav {
    background: #2d2d2d;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.category-nav-item {
        width: 100%;
        padding: 12px 15px;
        background: #f0f0f0;
        border: none;
        border-radius: 6px;
        cursor: pointer;
        font-size: 0.9rem;
        font-weight: 500;
        color: #333;
        text-align: left;
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
        display: flex;
        align-items: center;
        gap: 10px;
    }
    
    /* 调整工具列表容器样式 */
    .tools-container {
        flex: 1;
        background: white;
        border-radius: 10px;
        padding: 20px;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        min-height: 0;
        display: flex;
        flex-direction: column;
    }
    
    /* 工具网格样式调整 */
    .tools-grid {
        flex: 1;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 15px;
        margin-bottom: 10px;
        align-content: start;
    }

body.dark-mode .category-nav-item {
    background: #444;
    color: #f5f5f5;
}

.category-nav-item-icon {
    font-size: 1.2rem;
    margin-bottom: 5px;
}

body.dark-mode .category-nav-item {
    background: #444;
    color: #f5f5f5;
}

.category-nav-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: #667eea;
    transition: all 0.3s ease;
}

.category-nav-item:nth-child(1)::before { background: #ff6b6b; }
.category-nav-item:nth-child(2)::before { background: #4ecdc4; }
.category-nav-item:nth-child(3)::before { background: #45b7d1; }
.category-nav-item:nth-child(4)::before { background: #96ceb4; }
.category-nav-item:nth-child(5)::before { background: #ff9f1c; }

.category-nav-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

body.dark-mode .category-nav-item:hover {
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.category-nav-item.active {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

body.dark-mode .category-nav-item.active {
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.category-nav-item-icon {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

/* 子分类下拉菜单样式 */
.subcategory-dropdown {
    position: fixed;
    top: auto;
    left: auto;
    background: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    padding: 10px 0;
    display: none;
    z-index: 1001; /* 确保在所有元素上方 */
    flex-direction: column;
    min-width: 150px;
    max-height: 70vh; /* 限制最大高度，防止溢出 */
    overflow-y: auto; /* 内容过多时显示滚动条 */
}

body.dark-mode .subcategory-dropdown {
    background: #444;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

.category-nav-item:hover .subcategory-dropdown {
    display: flex;
}

.subcategory-item {
    padding: 8px 20px;
    cursor: pointer;
    transition: background 0.2s ease;
    text-align: left;
}

.subcategory-item:hover {
    background: #f0f0f0;
}

body.dark-mode .subcategory-item:hover {
    background: #555;
}

/* 响应式设计 */
@media (max-width: 992px) {
    /* 在中等屏幕上恢复原来的垂直布局 */
    .main-content {
        flex-direction: column;
        gap: 15px;
    }
    
    .category-nav {
        width: 100%;
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .category-nav-item {
        min-width: 120px;
        text-align: center;
        flex-direction: column;
        gap: 5px;
    }
    
    /* 默认隐藏侧边栏，只显示折叠按钮 */
    body {
        padding-left: 60px;
    }
    
    .sidebar {
        transform: translateX(-160px);
    }
    
    .sidebar-toggle {
        left: 40px;
    }
}

@media (max-width: 768px) {
    body {
        padding-top: 60px;
    }
    
    .header-fixed {
        padding: 6px 15px;
    }
    
    .logo {
        font-size: 1rem;
    }
    
    /* 移动端保持垂直导航 */
    .category-nav {
        flex-direction: column;
        gap: 8px;
        align-items: stretch;
    }
    
    .category-nav-item {
        min-width: auto;
        text-align: left;
        flex-direction: row;
        gap: 10px;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    #darkModeToggle {
        width: 30px;
        height: 30px;
        font-size: 0.9rem;
    }
    
    .tool-content-frame {
        height: 70vh;
    }
    
    /* 在移动端隐藏子分类菜单，避免触控冲突 */
    .subcategory-dropdown {
        display: none !important;
    }
    
    body {
        padding-left: 0;
        padding-top: 60px;
    }
    
    .sidebar {
        transform: translateX(-220px);
    }
    
    .sidebar-toggle {
        left: 10px;
    }
    
    .header-fixed {
        padding: 6px 10px;
    }
    
    .logo {
        font-size: 1rem;
    }
    
    #darkModeToggle {
        margin-left: 0;
    }
    
    .main-content {
        flex-direction: column;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    .tool-content-frame {
        height: 70vh;
    }
    
    /* 在移动端隐藏子分类菜单，避免触控冲突 */
    .subcategory-dropdown {
        display: none !important;
    }
}

/* 确保在桌面端显示子分类菜单 */
@media (min-width: 993px) {
    .subcategory-dropdown {
        display: none;
    }
}

/* 工具列表容器 */
.tools-container {
    background: white;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    background-image: linear-gradient(135deg, rgba(255, 255, 255, 0.5) 0%, rgba(240, 244, 248, 0.5) 100%);
    background-attachment: fixed;
}

body.dark-mode .tools-container {
    background: #2d2d2d;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    background-image: linear-gradient(135deg, rgba(45, 45, 45, 0.9) 0%, rgba(30, 30, 30, 0.9) 100%);
}

/* 搜索区域 - 优化布局和样式 */
.search-container {
    max-width: 50%;
    min-width: 400px;
    margin: 0 auto 15px;
    position: relative;
}

#searchInput {
    width: 100%;
    padding: 16px 30px;
    border: 1px solid #e0e0e0;
    border-radius: 50px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

#searchInput:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

body.dark-mode #searchInput {
    background-color: #333;
    border-color: #555;
    color: #f5f5f5;
}

#searchInput:focus {
    border-color: #667eea;
}

/* 工具网格 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

/* 工具卡片 */
.tool-card {
    background: white;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    text-decoration: none;
    color: #333;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    border-top: 3px solid #667eea;
    cursor: pointer;
}

.tool-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.dark-mode .tool-card {
    background: #3a3a3a;
    color: #f5f5f5;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.dark-mode .tool-card:hover {
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.5);
}

.tool-icon {
    font-size: 2rem;
    margin-bottom: 10px;
    color: #667eea;
}

.dark-mode .tool-icon {
    filter: brightness(1.1);
}

.tool-title {
    font-size: 1.1rem;
    margin-bottom: 6px;
    font-weight: 500;
}

.tool-description {
    color: #666;
    margin-bottom: 12px;
    font-size: 0.85rem;
    line-height: 1.4;
}

.dark-mode .tool-description {
    color: #ccc;
}

.tool-button {
    display: inline-block;
    padding: 6px 12px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: background 0.3s ease;
}

.dark-mode .tool-button {
    background: #5a67d8;
}

.tool-card[data-category="chinese-fengshui"] .tool-button {
    background: #ff6b6b;
}

.dark-mode .tool-card[data-category="chinese-fengshui"] .tool-button {
    background: #ee5253;
}

.tool-card[data-category="programming"] .tool-button {
    background: #4ecdc4;
}

.dark-mode .tool-card[data-category="programming"] .tool-button {
    background: #45b7aa;
}

.tool-card[data-category="notes"] .tool-button {
    background: #45b7d1;
}

.dark-mode .tool-card[data-category="notes"] .tool-button {
    background: #38a1b3;
}

.tool-card[data-category="office"] .tool-button {
    background: #96ceb4;
}

.dark-mode .tool-card[data-category="office"] .tool-button {
    background: #81c89d;
}

.tool-card[data-category="ai"] .tool-button {
    background: #ff9f1c;
}

.dark-mode .tool-card[data-category="ai"] .tool-button {
    background: #ff8e00;
}

.tool-button:hover {
    opacity: 0.9;
}

.tool-meta {
    margin-top: 8px;
    font-size: 0.75rem;
    color: #888;
}

body.dark-mode .tool-meta {
    color: #666;
}

/* 最近使用工具 */
.recently-used {
    margin-top: 30px;
    padding-top: 15px;
    border-top: 1px solid #e0e0e0;
}

body.dark-mode .recently-used {
    border-top-color: #444;
}

.recently-used h2 {
    text-align: center;
    margin-bottom: 15px;
    color: #667eea;
    font-size: 1.3rem;
}

.empty-state {
    text-align: center;
    padding: 30px 20px;
    color: #666;
}

body.dark-mode .empty-state {
    color: #aaa;
}

/* 工具内容区域 */
.tool-content-container {
    background: white;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: none;
    min-height: 500px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

body.dark-mode .tool-content-container {
    background: #2d2d2d;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.tool-content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e0e0e0;
}

body.dark-mode .tool-content-header {
    border-bottom-color: #444;
}

.tool-content-title {
    font-size: 1.3rem;
    color: #667eea;
}

.back-to-tools {
    padding: 8px 16px;
    background: #f0f0f0;
    color: #333;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background 0.3s ease;
}

body.dark-mode .back-to-tools {
    background: #444;
    color: #f5f5f5;
}

.back-to-tools:hover {
    background: #e0e0e0;
}

body.dark-mode .back-to-tools:hover {
    background: #555;
}

.tool-content-frame {
    width: 100%;
    height: calc(100vh - 150px);
    min-height: 400px;
    border: none;
    border-radius: 5px;
    overflow: hidden;
}

footer {
    text-align: center;
    padding: 20px;
    color: #666;
    font-size: 0.9rem;
}

body.dark-mode footer {
    color: #aaa;
}

@media (max-width: 480px) {
    body {
        padding-top: 60px;
    }
}