/* =========================================
   2026 优创资源导航 - 全局滚动吸附版 (Sticky Scroll Fix)
   ========================================= */

/* ----------------------------------
   1. 变量与基础 (Variables & Base)
   ---------------------------------- */
:root {
    /* 核心布局尺寸 */
    --header-height: 64px;    /* 顶部导航高度 */
    --search-total-height: 188px; /* NEW: 搜索区的固定总高度，用于精确计算 */
    --sidebar-width: 200px;   /* 侧边栏宽度 */
    --layout-gap: 24px;       /* 布局间距 */
    --layout-max-width: 96%;

    /* 圆角与阴影 */
    --radius-box: 16px;       
    --radius-card: 12px;      
    --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.03); 
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.06);

    /* 颜色系统 */
    --bg-page: #f4f6f9;       /* 页面背景 */
    --bg-white: #ffffff;
    --primary: #3b82f6;       
    --primary-light: #eff6ff; 
    --text-main: #1f2937;
    --text-sub: #6b7280;
    --border-color: #e5e7eb;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    outline: none;
}

html {
    scroll-behavior: smooth; /* 平滑滚动效果 */
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-page);
    color: var(--text-main);
    line-height: 1.5;
    
    overflow-x: hidden;
    overflow-y: auto; 
    height: auto;
    min-height: 100vh;
    
    padding-top: var(--header-height);
    
    /* 容器调整：flex布局确保页脚在底部 */
    display: flex;
    flex-direction: column;
}

a { text-decoration: none; color: inherit; transition: all 0.2s; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* ----------------------------------
   2. 顶部导航 (Fixed Header)
   ---------------------------------- */
.fixed-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 30px;
}

.header-inner {
    width: 100%;
    max-width: var(--layout-max-width);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    height: 100%;
    display: flex;
    align-items: center;
}

.search-center { display: none; } 

.header-links a {
    font-size: 14px;
    font-weight: 600;
    color: #555;
    margin-left: 24px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.header-links a:hover { color: var(--primary); }

/* ----------------------------------
   3. 搜索区 (Sticky Search Container)
   ---------------------------------- */
.search-container {
    position: relative; /* 修改为relative，跟随滚动 */
    z-index: 900;
    
    width: 100%;
    /* MODIFIED: Use a fixed height for predictable layout */
    height: var(--search-total-height);
    
    background-color: #f1f5f9; 
    border-bottom: 1px solid #e2e8f0;
    
    transition: box-shadow 0.3s;
    box-shadow: 0 4px 12px rgba(0,0,0,0.02);
    /* NEW: Prevent content overflow from breaking the fixed height */
    overflow: hidden;
}

.search-inner {
    max-width: var(--layout-max-width);
    margin: 0 auto;
    padding: 24px 30px;
}

/* 搜索分类菜单 */
.search-categories {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 16px;
    /* MODIFIED: Prevent wrapping to maintain parent's fixed height */
    flex-wrap: nowrap;
    overflow-x: auto;
    /* NEW: Hide the scrollbar for a cleaner look */
    scrollbar-width: none; /* For Firefox */
}
/* NEW: Hide scrollbar for Webkit browsers (Chrome, Safari) */
.search-categories::-webkit-scrollbar {
    display: none;
}


.category-item {
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    color: #6b7280;
    cursor: pointer;
    transition: all 0.2s ease;
}

.category-item:hover { background: #e5e7eb; color: var(--text-main); }
.category-item.active {
    color: var(--primary);
    background: var(--primary-light);
    font-weight: 600;
}

/* 搜索输入框区域 */
.search-input-area { margin-bottom: 16px; }
.search-form { max-width: 640px; margin: 0 auto; }

.search-input-wrapper {
    display: flex;
    align-items: center;
    background: #f8fafc;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    height: 50px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.search-input-wrapper:focus-within {
    border-color: #94a3b8;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.search-input {
    flex: 1;
    border: none;
    padding: 0 20px;
    font-size: 16px;
    height: 100%;
    background: transparent;
    color: #1e293b;
}

.search-input::placeholder {
    color: #94a3b8;
}

.search-button {
    width: 60px;
    height: 100%;
    border: none;
    background: #64748b;
    color: white;
    cursor: pointer;
    font-size: 18px;
    transition: all 0.2s ease;
}

.search-button:hover { 
    background: #475569;
    transform: scale(1.02);
}

/* 引擎切换 */
.engine-switcher {
    display: flex;
    justify-content: center;
    gap: 10px;
    /* MODIFIED: Prevent wrapping to maintain parent's fixed height */
    flex-wrap: nowrap;
    overflow-x: auto;
    /* NEW: Hide the scrollbar for a cleaner look */
    scrollbar-width: none; /* For Firefox */
}
/* NEW: Hide scrollbar for Webkit browsers (Chrome, Safari) */
.engine-switcher::-webkit-scrollbar {
    display: none;
}

.engine-item {
    font-size: 13px;
    color: #888;
    cursor: pointer;
    padding: 4px 10px;
    border-radius: 6px;
    transition: all 0.2s;
}
.engine-item:hover { color: var(--primary); background: #fff; }
.engine-item.active { color: var(--primary); background: #fff; font-weight: 600; box-shadow: 0 1px 2px rgba(0,0,0,0.05); }

/* ----------------------------------
   4. 全局容器 (Layout Container)
   ---------------------------------- */
.app-container {
    max-width: var(--layout-max-width);
    margin: 0 auto;
    padding-top: 0; 
    padding-bottom: 60px;
    padding-left: 24px;
    padding-right: 24px;
    
    /* 关键布局修改：使用flex布局 */
    display: flex;
    align-items: flex-start;
    
    /* 弹性填充：自动撑开空间，将footer推至底部 */
    flex: 1;
    
    height: auto;
    overflow: visible !important; /* 紧急修复：强制可见 */ 
}

/* ----------------------------------
   5. 侧边栏 (Sidebar - Sticky)
   ---------------------------------- */
.sidebar-wrapper {
    width: var(--sidebar-width);
    flex-shrink: 0;
    
    /* 初始间距：与搜索框保持20px视觉间距 */
    margin-top: 20px;
    
    /* 侧边栏吸附效果：sticky定位 */
    position: sticky !important;
    top: calc(var(--header-height) + 20px); /* 距离Header底部20px时锁定，保留呼吸感 */
    
    /* 核心：宽度自适应 */
    width: auto !important;
    min-width: 140px !important; /* 设置一个最小保底宽度 */
    max-width: 200px !important; /* 防止极端情况下太宽 */
    
    /* 彻底移除溢出裁剪，确保二级菜单完全可见 - 紧急修复 */
    overflow: visible !important;
    overflow-x: visible !important;
    overflow-y: visible !important;
    z-index: 1001; /* 提高层级，确保二级菜单不被遮挡 */
    
    background: rgba(255, 255, 255, 0.9) !important; /* 增加高级感 */
    backdrop-filter: blur(10px) !important; /* 毛玻璃效果 */
    border: 1px solid rgba(240, 242, 245, 0.8) !important; /* 细边框更高级 */
    border-radius: 16px !important; /* 圆角边框对齐卡片风格 */
    padding: 10px !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.03) !important;
}

/* 菜单项 */
.sidebar-menu {
    display: flex !important;
    flex-direction: column !important;
    justify-content: flex-start !important;
    height: auto !important;
    padding: 0 !important;
    gap: 2px !important;
    
    /* 内部滚动实现 - 紧急修复：强制visible */
    max-height: calc(100vh - 300px); /* 增加高度，让边框可以向下拉长 */
    overflow-y: auto !important;
    overflow-x: visible !important; /* 强制水平可见 */
    overflow: visible !important; /* 强制完全可见 */
    
    /* 自定义滚动条样式 - 极简设计 */
    scrollbar-width: none; /* Firefox 隐藏默认滚动条 */
}

/* Webkit 滚动条样式 */
.sidebar-menu::-webkit-scrollbar {
    width: 4px; /* 极窄滚动条 */
}

.sidebar-menu::-webkit-scrollbar-track {
    background: transparent; /* 轨道透明 */
}

.sidebar-menu::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.15); /* 半透明灰色 */
    border-radius: 2px; /* 圆角 */
    opacity: 0; /* 默认隐藏 */
    transition: opacity 0.3s ease;
}

/* 仅在悬停时显示滚动条 */
.sidebar-menu:hover::-webkit-scrollbar-thumb {
    opacity: 1;
}

/* 菜单项 */
.menu-item {
    display: flex;
    align-items: center;
    padding: 10px 16px; /* 适度松绑的内边距 */
    color: var(--text-sub);
    text-decoration: none;
    border-radius: 8px; /* 更现代的圆角 */
    font-size: 14px;
    transition: all 0.2s ease;
    cursor: pointer;
    line-height: 1.2; /* 减小行高 */
    letter-spacing: normal; /* 还原自然的字符形状 */
}

/* 图标规范化 */
.menu-item i {
    margin-right: 12px; /* 统一图标与文字间距 */
    font-size: 14px;
    width: 20px; /* 固定容器宽度 */
    height: 14px;
    text-align: center;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 强制单行不换行 + 分散对齐 */
.menu-item span {
    display: flex !important;
    white-space: nowrap !important; /* 强制文字在一行显示，严禁折行 */
    width: 82px; /* 固定宽度 */
    justify-content: space-between; /* 两端定位，字符均匀分布 */
    font-weight: 500;
    text-align-last: justify; /* 分散对齐 */
    text-justify: inter-character; /* 字符级别对齐 */
}

.menu-item:hover { background-color: #f9fafb; color: var(--primary); }
.menu-item:hover i { color: var(--primary); }
.menu-item.active { background-color: var(--primary-light); color: var(--primary); }
.menu-item.active i { color: var(--primary); }

/* 二级菜单样式 - 通用化处理 */
.menu-item-wrapper {
    position: relative;
}

.submenu-dropdown {
    position: absolute;
    left: 100%; /* 紧贴一级菜单 */
    top: 0;
    width: 320px; /* 固定宽度 */
    max-height: 400px; /* 最大高度 */
    background: #ffffff !important; /* 紧急修复：明显背景色 */
    backdrop-filter: blur(10px);
    border: 1px solid rgba(240, 242, 245, 0.8);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    opacity: 0;
    visibility: hidden;
    transform: translateX(-10px); /* 初始位置偏移 */
    transition: all 0.3s ease;
    z-index: 99999; /* 紧急修复：最高层级 */
    padding: 16px; /* 紧凑内边距 */
    pointer-events: none; /* 防止隐藏状态下误触 */
    overflow-y: auto; /* 滚动支持 */
    overflow-x: hidden; /* 隐藏横向滚动 */
}

/* 高优先级悬停触发 - 确保覆盖默认隐藏状态 */
.menu-item-wrapper:hover .submenu-dropdown {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateX(0) !important; /* 滑入到正确位置 */
    pointer-events: auto !important; /* 显示状态下可交互 */
}

.submenu-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* 两列布局 */
    gap: 8px; /* 适当缩小间距，使布局更紧凑 */
}

.submenu-item {
    display: flex;
    align-items: center;
    padding: 8px 10px; /* 缩小内边距，更紧凑 */
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-sub);
    font-size: 13px;
    transition: all 0.2s ease;
    background: transparent;
    border: 1px solid transparent;
}

.submenu-item span {
    white-space: nowrap; /* 强制单行 */
    overflow: hidden; /* 防止溢出 */
    text-overflow: ellipsis; /* 超长文字显示省略号 */
}

.submenu-item:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-1px);
}

.submenu-item i {
    margin-right: 8px;
    font-size: 14px;
    width: 14px;
    height: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.submenu-item span {
    font-weight: 500;
}

/* ----------------------------------
   6. 内容区 (Main Content)
   ---------------------------------- */
.main-content {
    /* 内容区自适应 */
    flex: 1;
    width: calc(100% - var(--sidebar-width)); /* 计算宽度减去侧边栏 */
    min-width: 0; /* 防止子元素撑破容器 */
    margin-left: 20px; /* 移除原本200px的错误边距，因为侧边栏已经在 flex flow 中占据了空间 */
    max-width: 100% !important; /* 充分利用空间 */
    padding: 0 24px !important; /* 左右padding为24px */
    box-sizing: border-box !important;
    min-height: 100vh;
    
    /* 增加呼吸感：与搜索框留出明显空白 */
    padding-top: 24px;
    
    /* 彻底移除高度限制和独立滚动，使用body自然滚动 */
    height: auto;
    overflow-y: visible;
    
    /* 设置flex布局，确保类目垂直整齐排列 */
    display: flex;
    flex-direction: column;
    gap: var(--layout-gap); /* 使用布局间距 */
}

.content-section {
    /* 移除margin，使用父容器的gap控制间距 */
    /* 同步锚点：确保跳转后间距与首页显示一致 */
    /* Header高度64px + main-content的24px + 额外间距12px = 100px */
    scroll-margin-top: 100px;
    
    /* 视觉岛屿设计 */
    background: #f8fafc; /* 非常淡的背景色 */
    border-radius: 20px; /* 圆角岛屿效果 */
    padding: 24px; /* 内边距优化 */
    margin-bottom: 40px; /* 间距拉开，用空白分割 */
    
    /* 微弱内阴影增加层次感 */
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
}

.section-title h2 {
    font-size: 18px;
    font-weight: 700;
    color: #111;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding-left: 12px; /* 增加左侧内边距 */
    position: relative; /* 为装饰条定位 */
}

/* 标题左侧彩色装饰条 */
.section-title h2::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 20px;
    background: #3b82f6; /* 蓝色装饰条 */
    border-radius: 2px;
}
.section-title h2 i { color: var(--primary); font-size: 18px; }

/* Section Header - 标题 + 竖线 + Tab 同行布局 */
.section-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.section-header h2 {
    font-size: 18px;
    font-weight: 700;
    color: #111;
    margin: 0; /* 移除默认margin */
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0; /* 防止压缩 */
}

.section-header h2 i { 
    color: var(--primary); 
    font-size: 18px; 
}

.title-separator {
    color: #e5e7eb; /* 浅灰色竖线 */
    margin: 0 15px; /* 左右外边距 */
    font-size: 18px; /* 与一级标题保持一致 */
    font-weight: 300;
    flex-shrink: 0; /* 防止压缩 */
}

/* 内容区Tab栏 - 在header内使用 */
.section-header .sub-category-tabs {
    display: flex;
    overflow-x: auto; /* 横向滑动 */
    white-space: nowrap; /* 强制单行 */
    gap: 8px;
    flex: 1; /* 占据剩余空间 */
    margin: 0; /* 移除默认margin */
    padding: 0; /* 移除默认padding */
    /* 隐藏滚动条 */
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE/Edge */
}
.section-header .sub-category-tabs::-webkit-scrollbar {
    display: none; /* Chrome/Safari/Opera */
}

.sub-category-tab {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    border-radius: 20px;
    background: #f8f9fa;
    color: #6c757d;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    border: 1px solid transparent;
    transition: all 0.2s ease;
    cursor: pointer;
    flex-shrink: 0; /* 防止压缩 */
}

.sub-category-tab:hover {
    background: #e9ecef;
    color: var(--primary);
    border-color: var(--primary);
}

.sub-category-tab.active {
    background: white; /* 白色背景 */
    color: var(--primary); /* 蓝色文字 */
    font-weight: 500; /* 适度加粗 */
    border: 1px solid var(--primary); /* 1px蓝色边框 */
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.15); /* 淡淡的蓝色投影 */
    /* 移除下划线，使用边框和投影代替 */
    position: relative;
}

.sub-category-tab.active::after {
    display: none; /* 隐藏下划线 */
}

.card-group {
    transition: all 0.3s ease;
    transform-origin: center;
    /* 初始加载动画 */
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

/* 卡片淡入动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 为不同卡片添加延迟动画 */
.card-group:nth-child(1) { animation-delay: 0.1s; }
.card-group:nth-child(2) { animation-delay: 0.2s; }
.card-group:nth-child(3) { animation-delay: 0.3s; }
.card-group:nth-child(4) { animation-delay: 0.4s; }
.card-group:nth-child(5) { animation-delay: 0.5s; }
.card-group:nth-child(6) { animation-delay: 0.6s; }

/* 强制5列网格布局 - 小众知识库风格 */
.card-grid {
    display: grid !important;
    /* 核心：强制一行 5 个，每个平分空间 */
    grid-template-columns: repeat(5, 1fr) !important;
    gap: 16px !important;
    padding: 10px 0;
    width: 100% !important;
}

/* 小众知识库风格轻量卡片 */
.card-item, .nav-card {
    display: flex !important;
    flex-direction: row !important; /* 横向排列 */
    align-items: center !important;
    padding: 10px 14px !important; /* 减小厚度 */
    background: #fff !important;
    border: 1px solid #f2f4f7 !important; /* 轻薄边框 */
    border-radius: 8px !important;
    transition: all 0.2s ease;
    text-decoration: none !important;
    color: inherit !important;
    height: 64px !important; /* 固定高度64px */
    min-height: 64px !important;
}

.card-item:hover, .nav-card:hover {
    border-color: #3b82f6 !important;
    background: #f8fbff !important;
    box-shadow: 0 4px 10px rgba(0,0,0,0.04) !important;
    transform: none !important; /* 移除悬浮效果 */
}

/* 核心修复：为所有带有 ID 的板块设置滚动间距 */
.category-section, 
section[id] {
    scroll-margin-top: 85px !important; /* 导航栏高度 + 15px 的呼吸间距 */
}

/* 确保滚动平滑（如果还没加的话） */
html {
    scroll-behavior: smooth;
}

/* 修正主体内容间距，防止被固定导航栏遮挡 */
body {
    padding-top: 70px !important; /* 对应 header 的高度 + 6px 间隙 */
}

/* Header 重构样式 */
.main-header {
    position: fixed !important; /* 核心：固定定位 */
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 64px !important;
    background: #ffffff !important; /* 确保背景不是透明的 */
    z-index: 9999 !important; /* 确保在所有卡片之上 */
    display: flex !important;
    justify-content: space-between !important; /* 核心：左右两端对齐 */
    align-items: center !important;
    padding: 0 40px !important; /* 增加左右边距，让内容往中间一点 */
    box-shadow: 0 2px 10px rgba(0,0,0,0.05) !important;
    box-sizing: border-box !important;
}

/* 左侧容器：Logo 和菜单横向紧挨 */
.header-left {
    display: flex !important;
    align-items: center !important;
    gap: 30px; /* 控制菜单距离Logo的距离 */
    flex-wrap: nowrap !important; /* 核心：绝对禁止换行 */
    white-space: nowrap !important; /* 核心：文字也不允许折行 */
    flex: 0 1 auto; /* 允许左侧容器自适应 */
}

.logo-wrapper {
    display: flex !important;
    align-items: center !important;
    flex-shrink: 0 !important; /* Logo 不允许被挤压 */
}

.logo {
    display: flex !important;
    align-items: center !important;
    gap: 10px;
    text-decoration: none;
    color: var(--text-main);
    font-weight: 600;
    font-size: 18px;
    flex-shrink: 0 !important; /* Logo 不允许被挤压 */
}

.logo img {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.top-nav-links {
    display: flex !important;
    gap: 20px;
    border-left: 1px solid #eee; /* 可选：加一条垂直分割线区分Logo */
    padding-left: 20px;
    flex-wrap: nowrap !important; /* 核心：绝对禁止换行 */
    white-space: nowrap !important; /* 核心：文字也不允许折行 */
}

/* 右侧容器：天气等横向排列 */
.header-right {
    display: flex !important;
    align-items: center !important;
    gap: 20px;
    flex-wrap: nowrap !important; /* 核心：绝对禁止换行 */
    white-space: nowrap !important; /* 核心：文字也不允许折行 */
    flex: 0 0 auto; /* 右侧容器不伸缩 */
}

.nav-item, .top-tool-link {
    display: flex !important;
    align-items: center !important;
    gap: 6px;
    color: #4b5563 !important;
    text-decoration: none !important;
    font-size: 14px !important;
    transition: color 0.2s;
}

.nav-item:hover, .top-tool-link:hover {
    color: #3b82f6 !important;
}

.weather-info {
    display: flex !important;
    align-items: center !important;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 14px;
    color: var(--text-main);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
}

.weather-info:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* 小屏幕响应式优化 */
@media (max-width: 900px) {
    .top-nav-links, .weather-info {
        display: none !important; /* 手机端只留 Logo 和 GitHub */
    }
    
    .header-left {
        gap: 15px; /* 减少Logo和右侧的间距 */
    }
    
    .header-right {
        gap: 10px; /* 减少右侧元素间距 */
    }
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: var(--bg-hover);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-main);
    font-size: 16px;
}

.mobile-menu-toggle:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* 超小屏幕：显示移动端菜单按钮，隐藏侧边栏 */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex !important; /* 显示菜单按钮 */
    }
    
    /* 隐藏侧边栏 */
    .sidebar-wrapper {
        position: fixed;
        left: -280px; /* 隐藏在左侧 */
        top: 64px; /* 从导航栏下方开始 */
        height: calc(100vh - 64px);
        background: white;
        box-shadow: 2px 0 10px rgba(0,0,0,0.1);
        transition: left 0.3s ease;
        z-index: 9998;
    }
    
    /* 显示侧边栏时的状态 */
    .sidebar-wrapper.mobile-menu-open {
        left: 0; /* 显示出来 */
    }
    
    /* 主内容区域调整 */
    .app-container {
        margin-left: 0 !important; /* 移除侧边栏空间 */
    }
    
    /* 隐藏导航栏中的多余元素 */
    .top-nav-links {
        display: none !important;
    }
    
    .weather-info {
        display: none !important;
    }
    
    .top-tool-link span {
        display: none; /* 只显示图标，隐藏文字 */
    }
}

/* 极小屏幕：进一步优化 */
@media (max-width: 480px) {
    .header-right {
        gap: 8px;
    }
    
    .top-tool-link {
        padding: 8px;
        font-size: 12px;
    }
}

/* AI资讯流样式 */
.articles-container {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important; /* 两列网格布局 */
    gap: 16px !important; /* 减少间距 */
    width: 100% !important;
    margin: 0 !important; /* 移除外边距 */
    padding: 0 !important; /* 移除内边距 */
}

.article-card {
    background: #f8fafc !important; /* 极浅背景色 */
    border: none !important; /* 去掉边框 */
    border-radius: 8px !important; /* 减小圆角 */
    padding: 16px !important; /* 减少内边距 */
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04) !important; /* 更细微阴影 */
    transition: all 0.2s ease !important;
    cursor: pointer !important;
    position: relative !important;
    overflow: hidden !important;
    margin: 0 !important; /* 移除外边距 */
}

.article-card:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1) !important;
}

/* 文章标题：限制最多2行 */
.article-title {
    font-size: 16px !important; /* 减小字体 */
    font-weight: 600 !important;
    color: var(--text-main) !important;
    margin: 0 0 8px 0 !important; /* 减少下边距 */
    line-height: 1.3 !important; /* 减小行高 */
    display: -webkit-box !important;
    -webkit-line-clamp: 2 !important;
    -webkit-box-orient: vertical !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
}

/* 文章摘要：默认隐藏，悬停显示 */
.article-excerpt {
    font-size: 13px !important; /* 减小字体 */
    color: var(--text-sub) !important;
    line-height: 1.5 !important; /* 减小行高 */
    margin: 0 0 12px 0 !important; /* 减少下边距 */
    opacity: 0 !important;
    height: 0 !important;
    overflow: hidden !important;
    transition: all 0.3s ease !important;
}

.article-card:hover .article-excerpt {
    opacity: 1 !important;
    height: auto !important;
    margin-top: 8px !important; /* 减少上边距 */
}

/* 文章元信息 */
.article-meta {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    font-size: 11px !important; /* 减小字体 */
    color: var(--text-sub) !important;
    margin-top: 8px !important; /* 减少上边距 */
}

/* 彩色分类标签 */
.article-category-tag {
    position: absolute !important;
    top: 16px !important;
    left: 16px !important;
    width: 8px !important;
    height: 8px !important;
    border-radius: 50% !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2) !important;
}

/* 不同类型的颜色 */
.category-llm { background: #3b82f6 !important; } /* 大模型 - 蓝色 */
.category-apps { background: #10b981 !important; } /* 应用 - 绿色 */
.category-research { background: #f59e0b !important; } /* 研究 - 橙色 */
.category-industry { background: #8b5cf6 !important; } /* 行业 - 紫色 */
.category-default { background: #6b7280 !important; } /* 默认 - 灰色 */

/* 文章元信息 */
.article-meta {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    font-size: 12px !important;
    color: var(--text-sub) !important;
    margin-top: auto !important;
}

.article-date {
    color: var(--text-sub) !important;
}

.article-author {
    color: var(--primary) !important;
    font-weight: 500 !important;
}

/* 刷新按钮 */
.refresh-btn {
    display: flex !important;
    align-items: center !important;
    gap: 6px !important;
    padding: 8px 16px !important;
    background: var(--primary) !important;
    color: white !important;
    border: none !important;
    border-radius: 6px !important;
    font-size: 14px !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
}

.refresh-btn:hover {
    background: var(--primary-dark) !important;
    transform: translateY(-1px) !important;
}

/* 轻量模态框 */
.article-modal {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    z-index: 10000 !important;
    display: none !important;
}

.modal-overlay {
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    background: rgba(255, 255, 255, 0.8) !important; /* 轻量背景 */
    backdrop-filter: blur(4px) !important;
}

.modal-content {
    position: absolute !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    background: white !important;
    border-radius: 12px !important;
    padding: 24px !important;
    max-width: 600px !important;
    max-height: 80vh !important;
    overflow-y: auto !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15) !important;
}

.modal-header {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    margin-bottom: 16px !important;
}

.modal-title {
    font-size: 20px !important;
    font-weight: 600 !important;
    color: var(--text-main) !important;
    margin: 0 !important;
}

.modal-close {
    width: 32px !important;
    height: 32px !important;
    border: none !important;
    background: var(--bg-hover) !important;
    border-radius: 6px !important;
    cursor: pointer !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    transition: all 0.2s ease !important;
}

.modal-close:hover {
    background: var(--primary) !important;
    color: white !important;
}

.modal-body {
    font-size: 16px !important;
    line-height: 1.7 !important;
    color: var(--text-main) !important;
}

/* 主内容区域调整 */
.content-section {
    padding: 24px !important; /* 增加内边距，让间距更合理 */
    margin: 0 !important; /* 移除外边距 */
    margin-bottom: 20px !important; /* 减少底部间距，让区块更紧凑 */
}

.section-header {
    margin-bottom: 24px !important; /* 增加下边距 */
}

/* 卡片网格间距调整 */
.card-grid {
    gap: 12px !important; /* 调整卡片间距更加紧凑 */
}

/* 响应式：小屏幕改为单列 */
@media (max-width: 768px) {
    .articles-container {
        grid-template-columns: 1fr !important;
        gap: 16px !important; /* 调整间距 */
    }
    
    .article-card {
        padding: 16px !important; /* 调整内边距 */
    }
    
    .article-title {
        font-size: 15px !important;
    }
    
    .content-section {
        padding: 20px !important; /* 移动端调整内边距 */
        margin-bottom: 24px !important; /* 移动端底部间距 */
    }
    
    .card-grid {
        gap: 16px !important; /* 移动端卡片间距 */
    }
    
    .section-header {
        margin-bottom: 20px !important; /* 移动端标题下边距 */
    }
    
    .modal-content {
        margin: 16px !important;
        max-width: calc(100% - 32px) !important;
    }
}

.weather-widget:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.weather-temp {
    font-weight: 600;
    color: var(--primary);
}

.weather-desc {
    color: var(--text-sub);
    font-size: 12px;
}

/* 热门搜索标签样式 */
.hot-search-tags {
    margin-top: 12px;
    padding: 0 20px;
}

.tag-title {
    font-size: 12px;
    color: var(--text-sub);
    margin-right: 12px;
    font-weight: 500;
}

.tags-container {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.search-tag {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-hover);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-main);
    text-decoration: none;
    font-size: 12px;
    transition: all 0.2s ease;
}

.search-tag:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-1px);
}

/* ----------------------------------
   7. 卡片样式 (Cards)
   ---------------------------------- */
.nav-card {
    background: var(--bg-white);
    border: 1px solid transparent;
    border-radius: var(--radius-card);
    padding: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    height: 72px;
    transition: all 0.2s ease;
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
    position: relative;
    overflow: visible;
}
.nav-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(59, 130, 246, 0.1);
    z-index: 2;
}

/* 全局卡片悬浮提示 - 专门针对.nav-card */
.nav-card::after {
    content: attr(data-description);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 12px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease 0.2s; /* 200ms延迟 */
    z-index: 9999;
    pointer-events: none;
    margin-bottom: 8px;
}

.nav-card::before {
    content: '';
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-top: 6px solid rgba(0, 0, 0, 0.9);
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease 0.2s; /* 200ms延迟 */
    z-index: 9999;
    pointer-events: none;
    margin-bottom: 2px;
}

.nav-card:hover::after {
    opacity: 1;
    visibility: visible;
}

.nav-card:hover::before {
    opacity: 1;
    visibility: visible;
}

.nav-card-icon {
    width: 32px !important;
    height: 32px !important;
    border-radius: 6px !important;
    margin-right: 12px !important;
    flex-shrink: 0 !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-size: 16px !important;
    background: #f8fafc !important;
}

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

.card-info h3 {
    font-size: 14px !important;
    font-weight: 500 !important;
    color: var(--text-main) !important;
    margin: 0 0 2px 0 !important;
    white-space: nowrap !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    line-height: 1.3 !important;
}

/* 添加.card-title样式支持 */
.card-title {
    font-size: 14px !important;
    font-weight: 500 !important;
    color: var(--text-main) !important;
    margin: 0 0 2px 0 !important;
    white-space: nowrap !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    line-height: 1.3 !important;
}

.card-info p {
    font-size: 12px !important;
    color: var(--text-sub) !important;
    margin: 0 !important;
    white-space: nowrap !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    line-height: 1.2 !important;
}

/* 添加.card-desc样式支持 */
.card-desc {
    font-size: 12px !important;
    color: var(--text-sub) !important;
    margin: 0 !important;
    white-space: nowrap !important;
    overflow: hidden !important;
    text-overflow: ellipsis !important;
    line-height: 1.2 !important;
}

/* 移动端响应式优化 */
@media (max-width: 768px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 12px !important;
    }
    
    .card-item, .nav-card {
        padding: 10px 12px !important;
        min-height: 48px !important;
    }
    
    .nav-card-icon {
        width: 28px !important;
        height: 28px !important;
        font-size: 14px !important;
        margin-right: 10px !important;
    }
    
    .card-info h3 {
        font-size: 13px !important;
    }
    
    .card-info p {
        font-size: 11px !important;
    }
    
    .main-content {
        padding: 0 16px !important;
    }
}

/* ----------------------------------
   8. 页脚
   ---------------------------------- */
.main-footer {
    width: 100%;
    padding: 30px 0;
    margin-top: auto; /* 边距修正：自动推至底部 */
    border-top: 1px solid rgba(240, 242, 245, 0.8);
    background: rgba(248, 249, 250, 0.9); /* 半透明背景 */
    backdrop-filter: blur(10px); /* 磨砂玻璃效果 */
    text-align: center;
}

.footer-content p {
    margin: 5px 0;
    color: #999;
    font-size: 13px;
}

.brand-text {
    font-weight: 600;
    color: #333;
}

.tech-support {
    color: #007bff !important; /* 突出品牌链接颜色 */
    font-weight: bold;
    text-decoration: none;
    transition: 0.3s;
}

.tech-support:hover {
    text-decoration: underline;
    opacity: 0.8;
}

.footer-link {
    color: #666 !important;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: var(--primary) !important;
    text-decoration: underline;
}

/* 移动端适配 */
@media screen and (max-width: 768px) {
    .main-footer {
        padding: 20px 0;
    }
}

/* ----------------------------------
   9. 响应式 (Responsive)
   ---------------------------------- */

/* 1400px以下 */
@media screen and (max-width: 1400px) {
    .card-grid { grid-template-columns: repeat(5, 1fr); }
}

/* 1200px以下 */
@media screen and (max-width: 1200px) {
    :root { --sidebar-width: 160px; } /* 减小侧边栏宽度 */
    .card-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); } /* 使用自适应网格 */
}

/* 768px-1200px 平板端优化 */
@media screen and (min-width: 769px) and (max-width: 1200px) {
    .main-content {
        margin-left: var(--layout-gap); /* 保持布局间距 */
        flex: 1; /* 增加内容区弹性 */
    }
    
    .sidebar-wrapper {
        width: var(--sidebar-width);
        position: sticky; /* 保持固定定位 */
        top: var(--header-height);
        height: calc(100vh - var(--header-height));
        overflow-y: auto;
    }
}

/* 768px以下 (平板/手机) */
@media screen and (max-width: 768px) {
    .app-container {
        flex-direction: column;
        padding-left: 16px;
        padding-right: 16px;
    }

    /* 侧边栏响应式处理 - 取消固定定位 */
    .sidebar-wrapper {
        width: 100%;
        position: static !important; /* 取消固定定位 */
        top: auto !important;
        left: auto !important;
        bottom: auto !important;
        height: auto !important;
        max-height: none;
        overflow-y: visible !important;
        z-index: auto !important;
        background: var(--bg-white) !important;
        border-radius: var(--radius-box) !important;
        border-right: none !important;
    }
    /* 移动端隐藏二级菜单 */
    .submenu-dropdown {
        display: none !important;
    }
    
    .sidebar-menu { flex-direction: row; gap: 10px; }
    .menu-item { background: #f9fafb; }
    
    /* 主内容区适配移动端 */
    .main-content {
        margin-left: 0 !important;
        width: 100% !important;
        min-height: auto;
    }
    
    .card-grid { grid-template-columns: repeat(5, 1fr); }
    
    /* 搜索容器不再 Sticky，避免占屏太多 */
    .search-container { 
        position: static;
        /* MODIFIED: Revert to auto height on mobile */
        height: auto;
    }
    .search-inner { padding: 20px 16px; }
}

/* 768px以下 (手机) */
@media screen and (max-width: 768px) {
    .card-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .nav-card { padding: 10px; }
}

/* =========================================
   Dark Theme Optimization (xiaozhongjishu style)
   ========================================= */
[data-theme="dark"] {
    --bg-page: #1e1e20;
    --bg-darker: #151515;
    --bg-card: #2d2d31;
    --bg-card-hover: #3a3a3f;
    --text-main: #f3f4f6;
    --text-sub: #9ca3af;
    --border-color: #3f3f46;
    --primary: #ef4444;       
    --primary-light: rgba(239, 68, 68, 0.1); 
}

/* Header */
[data-theme="dark"] .main-header, 
[data-theme="dark"] .fixed-header {
    background: var(--bg-darker) !important;
    border-bottom: 1px solid var(--border-color) !important;
}
[data-theme="dark"] .logo, 
[data-theme="dark"] .logo span {
    color: var(--text-main) !important;
}
[data-theme="dark"] .nav-item, 
[data-theme="dark"] .top-tool-link,
[data-theme="dark"] .theme-switch i {
    color: var(--text-sub) !important;
}
[data-theme="dark"] .nav-item:hover, 
[data-theme="dark"] .top-tool-link:hover,
[data-theme="dark"] .theme-switch:hover i {
    color: var(--text-main) !important;
}

/* Sidebar */
[data-theme="dark"] .sidebar-wrapper {
    background: var(--bg-darker) !important;
    border-right: 1px solid var(--border-color) !important;
}
[data-theme="dark"] .menu-category {
    color: var(--text-sub) !important;
}
[data-theme="dark"] .menu-item {
    color: #d1d5db !important;
}
[data-theme="dark"] .menu-item:hover {
    background: var(--bg-card-hover) !important;
    color: var(--text-main) !important;
}
[data-theme="dark"] .menu-item.active {
    background: var(--bg-card) !important;
    border-left: 3px solid var(--primary) !important;
    color: var(--primary) !important;
}

/* Body & Content Areas */
body[data-theme="dark"],
[data-theme="dark"] .app-container,
[data-theme="dark"] .main-content {
    background-color: var(--bg-page) !important;
    color: var(--text-main) !important;
}

[data-theme="dark"] .section-title {
    color: var(--text-main) !important;
    border-bottom: 1px solid var(--border-color) !important;
}
[data-theme="dark"] .content-section {
    background: var(--bg-darker) !important;
    border-radius: 12px !important;
    padding: 24px !important;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5) !important;
}

/* Cards */
[data-theme="dark"] .nav-card {
    background: var(--bg-card) !important;
    border: 1px solid var(--border-color) !important;
}
[data-theme="dark"] .nav-card:hover {
    background: var(--bg-card-hover) !important;
    border-color: var(--primary) !important;
}
[data-theme="dark"] .card-title {
    color: var(--text-main) !important;
}
[data-theme="dark"] .card-desc {
    color: var(--text-sub) !important;
}

/* Right Arrow Hover on Card (mimicking "直达") */
[data-theme="dark"] .nav-card::before {
    content: '\f054' !important; /* FontAwesome right chevron */
    font-family: 'Font Awesome 6 Free' !important;
    font-weight: 900 !important;
    position: absolute !important;
    right: 16px !important;
    top: 50% !important;
    transform: translateY(-50%) !important;
    color: var(--text-sub) !important;
    opacity: 0 !important;
    visibility: visible !important;
    font-size: 14px !important;
    border: none !important;
    background: transparent !important;
    width: auto !important;
    height: auto !important;
    transition: opacity 0.2s ease !important;
}
[data-theme="dark"] .nav-card:hover::before {
    opacity: 1 !important;
}

/* Search Area */
[data-theme="dark"] .search-container {
    background: var(--bg-darker) !important;
    border-bottom: 1px solid var(--border-color) !important;
}
[data-theme="dark"] .search-box {
    background: var(--bg-card) !important;
    border: 1px solid var(--border-color) !important;
}
[data-theme="dark"] .search-box:focus-within {
    border-color: var(--primary) !important;
    box-shadow: 0 0 0 3px var(--primary-light) !important;
}
[data-theme="dark"] .search-input {
    color: var(--text-main) !important;
    background: transparent !important;
}
[data-theme="dark"] .search-input::placeholder {
    color: var(--text-sub) !important;
}
[data-theme="dark"] .search-button {
    background: var(--bg-card-hover) !important;
    color: var(--text-main) !important;
}
[data-theme="dark"] .search-button:hover {
    background: var(--primary) !important;
    color: #fff !important;
}
[data-theme="dark"] .category-item,
[data-theme="dark"] .engine-item {
    color: var(--text-sub) !important;
}
[data-theme="dark"] .category-item:hover,
[data-theme="dark"] .engine-item:hover,
[data-theme="dark"] .engine-item.active { 
    background: var(--bg-card) !important; 
    color: var(--text-main) !important; 
    box-shadow: none !important;
}
[data-theme="dark"] .category-item.active {
    color: var(--primary) !important;
    background: var(--primary-light) !important;
}

/* Footer */
[data-theme="dark"] .main-footer {
    background: transparent !important;
    border-top: 1px solid var(--border-color) !important;
}
[data-theme="dark"] .brand-text, 
[data-theme="dark"] .footer-content p {
    color: var(--text-sub) !important;
}

/* Custom Scrollbar */
[data-theme="dark"] ::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
[data-theme="dark"] ::-webkit-scrollbar-track {
    background: var(--bg-page) !important;
}
[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background: var(--border-color) !important;
    border-radius: 3px;
}
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    background: var(--text-sub) !important;
}

/* Add toggle specific CSS */
.theme-switch {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    background: transparent;
    transition: all 0.3s ease;
    margin: 0 10px;
}
.theme-switch:hover {
    background: rgba(0,0,0,0.05);
}
[data-theme="dark"] .theme-switch:hover {
    background: rgba(255,255,255,0.1);
}
.theme-switch i {
    font-size: 16px;
    color: var(--text-sub);
    transition: all 0.3s ease;
}