/**
 * Modern Light Theme - Help Center
 * Version: 3.0.0
 * 基于 HSL 色彩系统，无硬编码颜色
 */

/* ========================================
   CSS Variables - HSL Color System
   ======================================== */
:root {
    /* ========================================
       品牌色 HSL 系统 (Brand Color HSL System)
       - 由模板注入 --theme-h, --theme-s, --theme-l
       - 所有颜色从这三个变量派生
       ======================================== */

    /* 品牌色 HSL 基础值 (由模板动态注入) */
    --theme-h: 220;
    --theme-s: 85%;
    --theme-l: 50%;

    /* 11 级色阶 - 全部基于 HSL 动态计算 */
    --color-50: hsl(var(--theme-h), var(--theme-s), 97%);
    --color-100: hsl(var(--theme-h), var(--theme-s), 94%);
    --color-200: hsl(var(--theme-h), var(--theme-s), 86%);
    --color-300: hsl(var(--theme-h), var(--theme-s), 74%);
    --color-400: hsl(var(--theme-h), var(--theme-s), 62%);
    --color-500: hsl(var(--theme-h), var(--theme-s), var(--theme-l));
    --color-600: hsl(var(--theme-h), var(--theme-s), 42%);
    --color-700: hsl(var(--theme-h), var(--theme-s), 34%);
    --color-800: hsl(var(--theme-h), var(--theme-s), 26%);
    --color-900: hsl(var(--theme-h), var(--theme-s), 18%);
    --color-950: hsl(var(--theme-h), var(--theme-s), 10%);

    /* 语义化品牌色变量 */
    --color-primary: var(--color-500);
    --color-primary-hover: var(--color-400);
    --color-primary-active: var(--color-600);
    --color-primary-light: hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.1);
    --color-primary-soft: hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.15);
    --color-primary-muted: hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.6);

    /* 强调色 - 直接使用品牌色 */
    --color-accent: var(--color-primary);
    --color-accent-hover: var(--color-primary-hover);
    --color-accent-light: var(--color-primary-light);

    /* 对比色（用于品牌色背景上的文字） */
    --color-primary-contrast: #FFFFFF;
    --color-primary-contrast-soft: rgba(255, 255, 255, 0.85);

    /* 语义色 - 使用 HSL 定义 */
    --color-danger: hsl(0, 72%, 51%);
    --color-success: hsl(160, 84%, 39%);
    --color-warning: hsl(38, 92%, 50%);
    --color-info: hsl(217, 91%, 60%);

    /* 背景色 - 浅色模式 */
    --color-bg: hsl(0, 0%, 100%);
    --color-bg-secondary: hsl(0, 0%, 98%);
    --color-bg-tertiary: hsl(0, 0%, 96%);
    --color-bg-elevated: hsl(0, 0%, 100%);
    --color-border: hsl(0, 0%, 90%);
    --color-border-hover: hsl(0, 0%, 80%);

    /* 文字色 - 浅色模式 */
    --color-text: hsl(0, 0%, 4%);
    --color-text-secondary: hsl(0, 0%, 32%);
    --color-text-muted: hsl(0, 0%, 64%);

    /* Hero 文字色 - 默认白色，JS 会根据品牌色亮度调整 */
    --hero-text: #FFFFFF;
    --hero-text-secondary: rgba(255, 255, 255, 0.75);
    --hero-text-muted: rgba(255, 255, 255, 0.5);
    --hero-badge-bg: 255, 255, 255;

    /* 阴影 - 使用品牌色光晕 */
    --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-glow: 0 0 40px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.25);

    /* 字体 */
    --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Helvetica Neue', sans-serif;
    --font-logo: 'Outfit', sans-serif;
    --font-code: 'SF Mono', 'Fira Code', Consolas, monospace;

    /* 布局 */
    --header-height: 64px;
    --sidebar-width: 260px;
    --toc-width: 240px;

    /* 过渡 */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* 代码块背景 */
    --code-bg: hsl(0, 0%, 12%);
}

/* ========================================
   深色模式 - 保留品牌色，调整背景和文字
   ======================================== */
[data-theme="dark"] {
    /* 品牌色在深色模式下稍微提亮 */
    --color-primary: var(--color-400);
    --color-primary-hover: var(--color-300);
    --color-primary-active: var(--color-500);
    --color-primary-light: hsla(var(--theme-h), var(--theme-s), 60%, 0.15);
    --color-primary-soft: hsla(var(--theme-h), var(--theme-s), 60%, 0.2);

    /* 强调色 - 深色模式下使用更亮的色阶 */
    --color-accent: var(--color-400);
    --color-accent-hover: var(--color-300);
    --color-accent-light: hsla(var(--theme-h), var(--theme-s), 60%, 0.15);

    /* 背景色 - 深色模式 */
    --color-bg: hsl(0, 0%, 4%);
    --color-bg-secondary: hsl(0, 0%, 9%);
    --color-bg-tertiary: hsl(0, 0%, 12%);
    --color-bg-elevated: hsl(0, 0%, 14%);
    --color-border: hsl(0, 0%, 18%);
    --color-border-hover: hsl(0, 0%, 25%);

    /* 文字色 - 深色模式 */
    --color-text: hsl(0, 0%, 98%);
    --color-text-secondary: hsl(0, 0%, 83%);
    --color-text-muted: hsl(0, 0%, 45%);

    /* Hero 文字色 - 深色模式下保持白色 */
    --hero-text: #FFFFFF;
    --hero-text-secondary: rgba(255, 255, 255, 0.75);
    --hero-text-muted: rgba(255, 255, 255, 0.5);

    /* 阴影 - 深色模式 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px hsla(var(--theme-h), var(--theme-s), 60%, 0.3);

    /* 代码块背景 */
    --code-bg: hsl(0, 0%, 8%);
}

/* 深色模式下文章内容样式 */
[data-theme="dark"] .article-body,
[data-theme="dark"] .article-body.prose {
    color: var(--color-text);
}

[data-theme="dark"] .article-body p,
[data-theme="dark"] .article-content p {
    color: var(--color-text-secondary);
}

[data-theme="dark"] .article-body h2,
[data-theme="dark"] .article-body h3,
[data-theme="dark"] .article-body h4,
[data-theme="dark"] .article-content h2,
[data-theme="dark"] .article-content h3,
[data-theme="dark"] .article-content h4 {
    color: var(--color-text);
}

[data-theme="dark"] .article-body ul,
[data-theme="dark"] .article-body ol,
[data-theme="dark"] .article-content ul,
[data-theme="dark"] .article-content ol {
    color: var(--color-text-secondary);
}

[data-theme="dark"] .article-body code,
[data-theme="dark"] .article-content code {
    background: var(--color-bg-secondary);
    border-color: var(--color-border);
    color: #E5E5E5;
}

[data-theme="dark"] .article-body pre,
[data-theme="dark"] .article-content pre {
    background: var(--code-bg);
    border: 1px solid var(--color-border);
}

[data-theme="dark"] .article-body pre code,
[data-theme="dark"] .article-content pre code {
    color: #E5E5E5;
}

[data-theme="dark"] .article-body blockquote,
[data-theme="dark"] .article-content blockquote {
    background: var(--color-bg-secondary);
    border-left-color: var(--color-accent);
    color: var(--color-text-secondary);
}

[data-theme="dark"] .article-body th,
[data-theme="dark"] .article-content th {
    background: var(--color-bg-secondary);
    color: var(--color-text);
}

[data-theme="dark"] .article-body td,
[data-theme="dark"] .article-content td {
    color: var(--color-text-secondary);
}

/* 深色模式下表格行悬停 */
[data-theme="dark"] .article-body tbody tr:nth-child(even),
[data-theme="dark"] .article-content tbody tr:nth-child(even) {
    background: var(--color-bg);
}

[data-theme="dark"] .article-body tbody tr:nth-child(odd),
[data-theme="dark"] .article-content tbody tr:nth-child(odd) {
    background: var(--color-bg-secondary);
}

/* 深色模式下图片边框 */
[data-theme="dark"] .article-body img,
[data-theme="dark"] .article-content img {
    border-color: var(--color-border);
}

/* 深色模式分割线 */
[data-theme="dark"] .article-body hr,
[data-theme="dark"] .article-content hr {
    border-top-color: var(--color-border);
}

/* 深色模式分类头部 */
[data-theme="dark"] .category-header {
    border-bottom-color: var(--color-border);
}

[data-theme="dark"] .category-header-icon {
    background: hsla(var(--theme-h), var(--theme-s), 50%, 0.2);
}

/* ========================================
   Reset & Base
   ======================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ========================================
   顶部导航
   ======================================== */
.top-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 0 48px;
    z-index: 100;
}

[data-theme="dark"] .top-header {
    background: rgba(10, 10, 10, 0.9);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 4px;
    overflow: hidden;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: opacity 0.2s;
}

.logo:hover {
    opacity: 0.8;
}

.logo-text {
    font-family: var(--font-logo);
    font-size: 22px;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.03em;
}

.logo-img {
    height: 36px;
    width: auto;
    max-width: 180px;
    object-fit: contain;
    margin-right: 10px;
}

.logo-initial {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: linear-gradient(135deg, hsl(var(--theme-h, 220), var(--theme-s, 85%), var(--theme-l, 50%)), hsl(var(--theme-h, 220), var(--theme-s, 85%), calc(var(--theme-l, 50%) - 12%)));
    color: #fff;
    font-family: var(--font-logo);
    font-size: 18px;
    font-weight: 700;
    text-transform: uppercase;
    margin-right: 10px;
    flex-shrink: 0;
    box-shadow: 0 2px 8px hsla(var(--theme-h, 220), var(--theme-s, 85%), var(--theme-l, 50%), 0.3);
}

.logo-accent {
    color: var(--color-accent);
}

.header-center {
    display: flex;
    justify-content: center;
}

.header-search {
    width: 100%;
    max-width: 480px;
    min-width: 320px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
}

.header-search:hover {
    border-color: #D4D4D4;
    background: var(--color-bg);
}

[data-theme="dark"] .header-search {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--color-border);
}

[data-theme="dark"] .header-search:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-border-hover);
}

.header-search svg {
    width: 18px;
    height: 18px;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.header-search span {
    flex: 1;
    font-size: 14px;
    color: var(--color-text-muted);
}

.header-search kbd {
    padding: 3px 8px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 5px;
    font-size: 12px;
    font-family: var(--font-body);
    color: var(--color-text-muted);
}

.header-right {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: 16px;
    padding-left: 16px;
    border-left: 1px solid var(--color-border);
}

.header-nav-link {
    padding: 6px 12px;
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s;
    white-space: nowrap;
}

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

[data-theme="dark"] .header-nav-link {
    color: rgba(255, 255, 255, 0.6);
}

[data-theme="dark"] .header-nav-link:hover {
    color: rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.08);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.theme-toggle:hover {
    background: var(--color-bg-secondary);
    border-color: #D4D4D4;
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

[data-theme="dark"] .theme-toggle {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--color-border);
}

[data-theme="dark"] .theme-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-border-hover);
}

/* ========================================
   Hero 区域
   ======================================== */
.hero {
    padding: 160px 48px 100px;
    /* 使用 HSL 品牌色创建渐变背景 */
    background:
        linear-gradient(180deg,
            hsla(0, 0%, 0%, 0.1) 0%,
            hsla(0, 0%, 0%, 0.15) 100%
        ),
        linear-gradient(180deg,
            hsl(var(--theme-h), var(--theme-s), var(--theme-l)) 0%,
            hsl(var(--theme-h), var(--theme-s), calc(var(--theme-l) - 5%)) 100%
        );
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* 深色模式 Hero - 品牌色与深色背景的优雅融合 */
[data-theme="dark"] .hero {
    background:
        linear-gradient(180deg,
            hsla(var(--theme-h), var(--theme-s), 50%, 0.35) 0%,
            hsla(var(--theme-h), var(--theme-s), 40%, 0.15) 40%,
            hsla(0, 0%, 4%, 0.95) 80%,
            hsl(0, 0%, 4%) 100%
        );
}

/* Hero 装饰层 - 添加纹理和光效 */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        /* 顶部高光 */
        radial-gradient(ellipse 80% 50% at 50% 0%, hsla(0, 0%, 100%, 0.12) 0%, transparent 50%),
        /* 左侧光斑 */
        radial-gradient(ellipse 40% 60% at 15% 30%, hsla(0, 0%, 100%, 0.06) 0%, transparent 50%),
        /* 右侧光斑 */
        radial-gradient(ellipse 35% 50% at 85% 25%, hsla(0, 0%, 100%, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

/* 深色模式 Hero 装饰层 - 品牌色光效 */
[data-theme="dark"] .hero::before {
    background:
        /* 顶部品牌色光晕 */
        radial-gradient(ellipse 100% 80% at 50% 0%, hsla(var(--theme-h), var(--theme-s), 50%, 0.25) 0%, transparent 60%),
        /* 左侧品牌色光斑 */
        radial-gradient(ellipse 40% 60% at 15% 30%, hsla(var(--theme-h), var(--theme-s), 50%, 0.1) 0%, transparent 50%),
        /* 右侧品牌色光斑 */
        radial-gradient(ellipse 35% 50% at 85% 25%, hsla(var(--theme-h), var(--theme-s), 50%, 0.08) 0%, transparent 50%);
}

/* Hero 底部过渡 */
.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(180deg, transparent 0%, var(--color-bg) 100%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 720px;
    margin: 0 auto;
}

/* Hero 顶部支持标签 - 独立配色，精致玻璃态设计 */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 10px 20px 10px 14px;
    /* 深色玻璃态背景，不依赖品牌色 */
    background: linear-gradient(
        135deg,
        rgba(15, 23, 42, 0.85) 0%,
        rgba(30, 41, 59, 0.8) 100%
    );
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 28px;
    backdrop-filter: blur(12px);
    box-shadow: 
        0 4px 16px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.08);
    transition: all 0.3s ease;
}

.hero-badge:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 8px 24px rgba(0, 0, 0, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

/* 深色模式下的 Hero 标签 */
[data-theme="dark"] .hero-badge {
    background: linear-gradient(
        135deg,
        rgba(30, 41, 59, 0.9) 0%,
        rgba(51, 65, 85, 0.85) 100%
    );
    border-color: rgba(255, 255, 255, 0.08);
}

.hero-badge-dot {
    width: 8px;
    height: 8px;
    /* 使用明亮的绿色表示在线状态 */
    background: linear-gradient(135deg, #22c55e 0%, #4ade80 100%);
    border-radius: 50%;
    animation: pulse-glow 2s infinite;
    box-shadow: 
        0 0 0 3px rgba(34, 197, 94, 0.2),
        0 0 12px rgba(34, 197, 94, 0.6);
}

@keyframes pulse-glow {
    0%, 100% { 
        opacity: 1; 
        transform: scale(1);
        box-shadow: 
            0 0 0 3px rgba(34, 197, 94, 0.2),
            0 0 12px rgba(34, 197, 94, 0.6);
    }
    50% { 
        opacity: 0.85; 
        transform: scale(0.92);
        box-shadow: 
            0 0 0 4px rgba(34, 197, 94, 0.15),
            0 0 16px rgba(34, 197, 94, 0.4);
    }
}

/* pulse 动画已被 pulse-glow 替代 */

.hero h1 {
    font-family: var(--font-logo);
    font-size: 52px;
    font-weight: 800;
    color: var(--hero-text);
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-desc {
    font-size: 18px;
    color: var(--hero-text-secondary);
    line-height: 1.6;
    margin-bottom: 44px;
}

/* Hero 搜索框 */
.search-container {
    max-width: 580px;
    margin: 0 auto;
}

.search-box-hero {
    display: flex;
    align-items: center;
    gap: 12px;
    background: #FFFFFF;
    border-radius: 14px;
    padding: 16px 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    transition: all 0.2s;
}

.search-box-hero:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
    transform: translateY(-2px);
}

/* 深色模式搜索框 */
[data-theme="dark"] .search-box-hero {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .search-box-hero:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.18);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] .search-icon-hero {
    color: rgba(255, 255, 255, 0.5);
}

[data-theme="dark"] .search-placeholder {
    color: rgba(255, 255, 255, 0.5);
}

[data-theme="dark"] .search-kbd {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.15);
    color: rgba(255, 255, 255, 0.6);
}

.search-icon-hero {
    color: var(--color-text-muted);
}

.search-placeholder {
    flex: 1;
    font-size: 16px;
    color: var(--color-text-muted);
    text-align: left;
}

.search-kbd {
    padding: 6px 12px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 13px;
    font-family: var(--font-body);
    color: var(--color-text-muted);
}

.search-hints {
    margin-top: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.search-hint-label {
    font-size: 13px;
    color: var(--hero-text-muted);
}

.search-hint-tag {
    padding: 6px 14px;
    background: rgba(var(--hero-badge-bg, 255, 255, 255), 0.1);
    border: 1px solid rgba(var(--hero-badge-bg, 255, 255, 255), 0.15);
    border-radius: 8px;
    font-size: 13px;
    color: var(--hero-text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    backdrop-filter: blur(4px);
}

.search-hint-tag:hover {
    background: rgba(var(--hero-badge-bg, 255, 255, 255), 0.18);
    color: var(--hero-text);
    border-color: rgba(var(--hero-badge-bg, 255, 255, 255), 0.25);
    transform: translateY(-1px);
}

/* ========================================
   分类卡片区域
   ======================================== */
.cards-section {
    padding: 80px 48px 100px;
    max-width: 1200px;
    margin: 0 auto;
}

.cards-header {
    text-align: center;
    margin-bottom: 56px;
}

.cards-header h2 {
    font-family: var(--font-logo);
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.cards-header p {
    font-size: 16px;
    color: var(--color-text-secondary);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
    justify-content: center;
}

/* 当卡片数量不足时居中显示 */
@media (min-width: 1100px) {
    .cards-grid {
        grid-template-columns: repeat(4, 280px);
        justify-content: center;
    }
    
    /* 3 个卡片时居中 */
    .cards-grid:has(.help-card:nth-child(3)):not(:has(.help-card:nth-child(4))) {
        grid-template-columns: repeat(3, 280px);
    }
    
    /* 2 个卡片时居中 */
    .cards-grid:has(.help-card:nth-child(2)):not(:has(.help-card:nth-child(3))) {
        grid-template-columns: repeat(2, 280px);
    }
}

.help-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 32px 28px;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.help-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.help-card:hover {
    border-color: var(--color-400);
    box-shadow:
        0 0 0 1px var(--color-400),
        0 8px 24px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.15),
        0 16px 48px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.1);
    transform: translateY(-4px);
}

.help-card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
    font-size: 24px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-icon svg {
    width: 24px;
    height: 24px;
    transition: transform 0.3s ease;
}

.card-emoji {
    font-size: 24px;
    line-height: 1;
    transition: transform 0.3s ease;
}

.help-card:hover .card-icon {
    background: var(--color-primary-soft);
    color: var(--color-primary);
    border-color: hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.3);
    transform: scale(1.05);
}

.help-card:hover .card-emoji {
    transform: scale(1.1);
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 8px;
}

.card-desc {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
    flex: 1;
}

.card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    border-top: 1px solid var(--color-border);
}

.card-count {
    font-size: 13px;
    color: var(--color-text-muted);
}

.card-arrow {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.help-card:hover .card-arrow {
    background: var(--color-500);
    border-color: var(--color-500);
    color: white;
    transform: translateX(2px) scale(1.05);
    box-shadow: 0 4px 12px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.4);
}

/* 深色模式分类卡片 */
[data-theme="dark"] .help-card {
    background: var(--color-bg-secondary);
    border-color: var(--color-border);
}

[data-theme="dark"] .help-card:hover {
    border-color: var(--color-400);
    box-shadow:
        0 0 0 1px var(--color-400),
        0 8px 24px hsla(var(--theme-h), var(--theme-s), 50%, 0.2),
        0 16px 48px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .card-icon {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--color-border);
}

[data-theme="dark"] .help-card:hover .card-icon {
    background: var(--color-primary-soft);
    color: var(--color-primary);
    border-color: hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.4);
}

[data-theme="dark"] .card-meta {
    border-top-color: var(--color-border);
}

[data-theme="dark"] .card-arrow {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--color-border);
}

[data-theme="dark"] .help-card:hover .card-arrow {
    box-shadow: 0 4px 12px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.4);
}

/* ========================================
   文档分类导航（子分类）
   ======================================== */
.subcategories-section {
    padding: 0 48px 80px;
    max-width: 1200px;
    margin: 0 auto;
}

.subcategories-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 28px;
}

.subcategories-header h2 {
    font-family: var(--font-logo);
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.subcategories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.subcategory-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 20px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.2s ease;
}

.subcategory-item:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    transform: translateX(4px);
}

.subcategory-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--color-bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 18px;
    flex-shrink: 0;
    transition: all 0.2s;
}

.subcategory-item:hover .subcategory-icon {
    background: var(--color-primary);
    color: white;
}

.subcategory-content {
    flex: 1;
    min-width: 0;
}

.subcategory-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
}

.subcategory-count {
    font-size: 13px;
    color: var(--color-text-muted);
}

.subcategory-arrow {
    color: var(--color-text-muted);
    flex-shrink: 0;
    transition: all 0.2s;
}

.subcategory-item:hover .subcategory-arrow {
    color: var(--color-primary);
    transform: translateX(4px);
}

/* 深色模式文档分类 */
[data-theme="dark"] .subcategory-item {
    background: var(--color-bg-secondary);
    border-color: var(--color-border);
}

[data-theme="dark"] .subcategory-item:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
}

[data-theme="dark"] .subcategory-icon {
    background: rgba(255, 255, 255, 0.06);
}

/* 响应式 */
@media (max-width: 900px) {
    .subcategories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .subcategories-section {
        padding: 0 24px 60px;
    }
    
    .subcategories-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   热门问题
   ======================================== */
.popular-section {
    padding: 0 48px 100px;
    max-width: 1200px;
    margin: 0 auto;
}

.popular-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 36px;
}

.popular-header h2 {
    font-family: var(--font-logo);
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.view-all {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color 0.2s;
}

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

.popular-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.popular-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 14px;
    text-decoration: none;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.popular-item:hover {
    border-color: hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.25);
    box-shadow: 0 4px 16px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.08);
    transform: translateX(4px);
}

.popular-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--color-bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.popular-content {
    flex: 1;
    min-width: 0;
}

.popular-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.popular-category {
    font-size: 13px;
    color: var(--color-text-muted);
}

.popular-arrow {
    color: var(--color-text-muted);
    transition: all 0.2s;
    flex-shrink: 0;
}

.popular-item:hover .popular-arrow {
    color: var(--color-primary);
    transform: translateX(4px);
}

/* 深色模式热门问题 */
[data-theme="dark"] .popular-item {
    background: var(--color-bg-secondary);
    border-color: var(--color-border);
}

[data-theme="dark"] .popular-item:hover {
    border-color: hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.35);
    box-shadow: 0 4px 16px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.15);
}

[data-theme="dark"] .popular-icon {
    background: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .popular-item:hover .popular-icon {
    background: var(--color-primary-soft);
    color: var(--color-primary);
}

/* ========================================
   联系支持
   ======================================== */
.contact-section {
    padding: 80px 48px;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.contact-container {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-section h2 {
    font-family: var(--font-logo);
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.contact-section p {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: 36px;
}

.contact-options {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.contact-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    font-family: var(--font-body);
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.contact-btn-primary {
    background: var(--color-primary);
    color: var(--hero-text);
    position: relative;
    overflow: hidden;
}

.contact-btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 50%);
    opacity: 0;
    transition: opacity 0.3s;
}

.contact-btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow:
        0 4px 12px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.3),
        0 8px 24px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.2);
}

.contact-btn-primary:hover::before {
    opacity: 1;
}

[data-theme="dark"] .contact-btn-primary {
    /* 深色模式下保持品牌色按钮 */
    background: var(--color-primary);
    color: var(--hero-text);
}

[data-theme="dark"] .contact-btn-primary:hover {
    background: var(--color-primary-hover);
    box-shadow:
        0 4px 12px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.4),
        0 8px 24px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.3);
}

.contact-btn-outline {
    background: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.contact-btn-outline:hover {
    border-color: #D4D4D4;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] .contact-section {
    background: var(--color-bg-secondary);
    border-top-color: var(--color-border);
}

[data-theme="dark"] .contact-btn-outline {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--color-border);
}

[data-theme="dark"] .contact-btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-border-hover);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* ========================================
   页脚
   ======================================== */
.footer {
    padding: 32px 48px;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-copyright {
    font-size: 14px;
    color: var(--color-text-muted);
}

.footer-links {
    display: flex;
    gap: 28px;
}

.footer-links a {
    font-size: 14px;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--color-text);
}

/* 深色模式页脚 */
[data-theme="dark"] .footer {
    background: var(--color-bg);
    border-top-color: var(--color-border);
}

/* 深色模式面包屑 */
[data-theme="dark"] .breadcrumb-separator {
    color: var(--color-text-muted);
}

/* 深色模式相关文章 */
[data-theme="dark"] .related-articles {
    border-top-color: var(--color-border);
}

[data-theme="dark"] .related-link {
    border-bottom-color: var(--color-border);
}

/* 深色模式 TOC */
[data-theme="dark"] .toc-feedback {
    border-top-color: var(--color-border);
}

/* 深色模式空状态 */
[data-theme="dark"] .empty-state {
    color: var(--color-text-muted);
}

[data-theme="dark"] .empty-state h3 {
    color: var(--color-text-secondary);
}

/* ========================================
   搜索模态框
   ======================================== */
.search-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding-top: 10vh;
}

.search-modal-overlay.active {
    display: flex;
}

.search-modal {
    width: 100%;
    max-width: 640px;
    background: var(--color-bg);
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    overflow: hidden;
    animation: modalSlideIn 0.2s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.search-modal-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
}

.search-modal-header svg {
    width: 20px;
    height: 20px;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.search-modal-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 16px;
    font-family: var(--font-body);
    color: var(--color-text);
    background: transparent;
}

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

.search-modal-close {
    padding: 4px 8px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 12px;
    font-family: var(--font-body);
    color: var(--color-text-muted);
    cursor: pointer;
}

.search-modal-body {
    max-height: 400px;
    overflow-y: auto;
}

.search-section-title {
    padding: 12px 20px 8px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
}

.search-results {
    list-style: none;
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    cursor: pointer;
    transition: background 0.15s;
}

.search-result-item:hover,
.search-result-item.selected {
    background: var(--color-bg-secondary);
}

.search-result-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--color-bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.search-result-item:hover .search-result-icon,
.search-result-item.selected .search-result-icon {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.search-result-content {
    flex: 1;
    min-width: 0;
}

.search-result-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 2px;
}

.search-result-desc {
    font-size: 13px;
    color: var(--color-text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* 搜索结果高亮 */
.search-result-title mark,
.search-result-desc mark {
    background: rgba(var(--color-primary-rgb, 59, 130, 246), 0.2);
    color: var(--color-primary);
    padding: 0 2px;
    border-radius: 2px;
}

/* 搜索结果类型标签 */
.search-result-type {
    font-size: 11px;
    font-weight: 500;
    color: var(--color-text-muted);
    background: var(--color-bg-secondary);
    padding: 4px 8px;
    border-radius: 4px;
    flex-shrink: 0;
}

.search-result-item:hover .search-result-type,
.search-result-item.selected .search-result-type {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* 搜索结果按类型区分颜色 */
.search-result-item[data-type="video"] .search-result-icon {
    color: #E11D48;
}
.search-result-item[data-type="video"]:hover .search-result-icon,
.search-result-item[data-type="video"].selected .search-result-icon {
    background: rgba(225, 29, 72, 0.1);
    color: #E11D48;
}

.search-result-item[data-type="faq"] .search-result-icon {
    color: #7C3AED;
}
.search-result-item[data-type="faq"]:hover .search-result-icon,
.search-result-item[data-type="faq"].selected .search-result-icon {
    background: rgba(124, 58, 237, 0.1);
    color: #7C3AED;
}

/* 快速链接 */
.search-quick-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 0 20px 16px;
}

.search-quick-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 13px;
    color: var(--color-text);
    text-decoration: none;
    transition: all 0.15s;
}

.search-quick-link:hover {
    background: var(--color-primary-light);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.search-quick-link svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* 搜索空状态 */
.search-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px 24px;
    text-align: center;
    color: var(--color-text-muted);
}

.search-empty svg {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    opacity: 0.4;
    stroke-width: 1;
}

.search-empty p {
    margin: 0;
    font-size: 15px;
    line-height: 1.5;
}

.search-empty .search-tip {
    margin-top: 8px;
    font-size: 13px;
    opacity: 0.7;
}

[data-theme="dark"] .search-empty svg {
    opacity: 0.3;
}

.search-modal-footer {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 20px;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
}

.search-shortcut {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--color-text-muted);
}

.search-shortcut kbd {
    padding: 2px 6px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 11px;
    font-family: var(--font-body);
}

/* 深色模式搜索模态框 */
[data-theme="dark"] .search-modal-overlay {
    background: rgba(0, 0, 0, 0.7);
}

[data-theme="dark"] .search-modal {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] .search-modal-header {
    border-bottom-color: var(--color-border);
}

[data-theme="dark"] .search-modal-close {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-border);
}

[data-theme="dark"] .search-result-item:hover,
[data-theme="dark"] .search-result-item.selected {
    background: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .search-result-icon {
    background: rgba(255, 255, 255, 0.06);
}

[data-theme="dark"] .search-modal-footer {
    background: var(--color-bg);
    border-top-color: var(--color-border);
}

[data-theme="dark"] .search-shortcut kbd {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-border);
}

/* ========================================
   文章详情页布局
   ======================================== */
.main-layout,
.article-layout {
    display: flex;
    padding-top: var(--header-height);
    min-height: 100vh;
}

.main-wrapper {
    padding-top: var(--header-height);
}

.page-article .main-wrapper {
    padding-top: 0;
}

.article-layout {
    padding-top: 0;
    margin-top: var(--header-height);
}

/* 侧边栏 */
.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background: var(--color-bg);
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    overflow-y: auto;
    padding: 20px 0;
    border-right: 1px solid var(--color-border);
}

.sidebar::-webkit-scrollbar {
    width: 4px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 2px;
}

.sidebar-section {
    margin-bottom: 8px;
}

.sidebar-title {
    padding: 16px 20px 8px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
}

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

.sidebar-item {
    position: relative;
}

.sidebar-link {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 7px 20px;
    font-size: 14px;
    line-height: 1.4;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all 0.15s;
    cursor: pointer;
}

.sidebar-link:hover {
    color: var(--color-text);
    background: var(--color-bg-secondary);
}

.sidebar-link.active {
    color: var(--color-primary);
    background: var(--color-primary-light);
    font-weight: 500;
}

.sidebar-link svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    margin-top: 2px;
    opacity: 0.5;
}

.sidebar-link:hover svg {
    opacity: 0.8;
}

.sidebar-link.active svg {
    opacity: 1;
}

/* 深色模式侧边栏 */
[data-theme="dark"] .sidebar {
    background: var(--color-bg);
    border-right-color: var(--color-border);
}

[data-theme="dark"] .sidebar-link:hover {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .sidebar-group-link:hover {
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .sidebar-count {
    background: rgba(255, 255, 255, 0.1);
}

.sidebar-group-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 20px;
    font-size: 14px;
    line-height: 1.4;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all 0.15s;
    cursor: pointer;
    font-weight: 500;
}

.sidebar-group-link:hover {
    color: var(--color-text);
    background: var(--color-bg-secondary);
}

.sidebar-group-link.active {
    color: var(--color-primary);
    background: var(--color-primary-light);
}

.sidebar-icon {
    flex-shrink: 0;
    opacity: 0.6;
}

.sidebar-text {
    flex: 1;
    min-width: 0;
}

.sidebar-count {
    margin-left: auto;
    padding: 2px 8px;
    background: var(--color-border);
    border-radius: 10px;
    font-size: 11px;
    color: var(--color-text-muted);
    font-weight: 500;
}

.sidebar-list {
    list-style: none;
    padding-left: 0;
}

.sidebar-list .sidebar-link {
    padding-left: 46px;
    font-size: 13px;
    font-weight: 400;
}

/* 内容区域 */
.content-wrapper,
.article-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-width: 0;
    padding: 40px 48px 80px;
}

/* 当有 TOC 时为右侧预留空间 */
.has-toc .article-main {
    margin-right: var(--toc-width);
    max-width: calc(100% - var(--sidebar-width) - var(--toc-width));
}

/* 无 TOC 时内容区域居中 */
.no-toc .article-main {
    margin-right: 0;
    max-width: calc(100% - var(--sidebar-width));
}

/* 文章内容居中 */
.article-content {
    max-width: 760px;
    margin: 0 auto;
}

.content {
    max-width: 760px;
    margin: 0 auto;
}

/* 面包屑 */
.breadcrumb {
    margin-bottom: 24px;
    font-size: 13px;
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.breadcrumb-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.breadcrumb a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s;
}

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

.breadcrumb-separator {
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.breadcrumb-current {
    color: var(--color-text-secondary);
}

/* 文章头部 */
.article-header {
    margin-bottom: 32px;
}

.article-title {
    font-family: var(--font-logo);
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.25;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 14px;
    color: var(--color-text-muted);
}

.article-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.article-meta-item svg {
    width: 16px;
    height: 16px;
}

/* 文章内容 */
.article-content {
    max-width: 760px;
}

.article-body,
.article-body.prose {
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-text);
}

.article-body > p:first-child {
    font-size: 17px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 32px;
}

.article-body h2,
.article-content h2 {
    font-family: var(--font-logo);
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
    margin: 48px 0 16px;
    padding-top: 24px;
    letter-spacing: -0.01em;
    scroll-margin-top: 100px;
}

.article-body h2:first-of-type,
.article-content h2:first-of-type {
    margin-top: 0;
    padding-top: 0;
}

.article-body h3,
.article-content h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-text);
    margin: 32px 0 12px;
    scroll-margin-top: 100px;
}

.article-body p,
.article-content p {
    margin-bottom: 16px;
    color: var(--color-text-secondary);
}

.article-body a,
.article-content a {
    color: var(--color-primary);
    text-decoration: none;
}

.article-body a:hover,
.article-content a:hover {
    text-decoration: underline;
}

.article-body ul,
.article-body ol,
.article-content ul,
.article-content ol {
    margin-bottom: 16px;
    padding-left: 20px;
    color: var(--color-text-secondary);
}

.article-body li,
.article-content li {
    margin-bottom: 8px;
    padding-left: 4px;
}

.article-body img,
.article-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 20px 0;
    border: 1px solid var(--color-border);
}

.article-body code,
.article-content code {
    padding: 2px 6px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-family: var(--font-code);
    font-size: 13px;
    color: var(--color-text);
}

.article-body pre,
.article-content pre {
    background: var(--code-bg);
    border-radius: 8px;
    padding: 16px;
    margin: 20px 0;
    overflow-x: auto;
}

.article-body pre code,
.article-content pre code {
    padding: 0;
    background: transparent;
    border: none;
    font-size: 13px;
    color: #D4D4D4;
}

.article-body blockquote,
.article-content blockquote {
    margin: 20px 0;
    padding: 16px 20px;
    border-left: 4px solid var(--color-accent);
    background: var(--color-bg-secondary);
    border-radius: 0 8px 8px 0;
    color: var(--color-text-secondary);
    font-style: italic;
}

.article-body blockquote p,
.article-content blockquote p {
    margin-bottom: 0;
}

.article-body blockquote p:not(:last-child),
.article-content blockquote p:not(:last-child) {
    margin-bottom: 8px;
}

.article-body hr,
.article-content hr {
    margin: 32px 0;
    border: none;
    border-top: 1px solid var(--color-border);
}

/* 表格容器 - 支持横向滚动 */
.article-body .table-wrapper,
.article-content .table-wrapper {
    width: 100%;
    overflow-x: auto;
    margin: 20px 0;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.article-body table,
.article-content table {
    width: 100%;
    margin: 20px 0;
    border-collapse: collapse;
    font-size: 14px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--color-border);
}

/* 当表格在 wrapper 内时，去掉外层 margin 和 border */
.article-body .table-wrapper table,
.article-content .table-wrapper table {
    margin: 0;
    border: none;
    border-radius: 0;
}

.article-body thead,
.article-content thead {
    background: var(--color-bg-secondary);
}

.article-body th,
.article-content th,
.article-body td,
.article-content td {
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    text-align: left;
    white-space: nowrap;
}

/* 第一列和内容列允许换行 */
.article-body td:first-child,
.article-content td:first-child,
.article-body td:last-child,
.article-content td:last-child {
    white-space: normal;
    min-width: 100px;
}

.article-body th,
.article-content th {
    background: var(--color-bg-secondary);
    font-weight: 600;
    color: var(--color-text);
    white-space: nowrap;
}

.article-body tbody tr,
.article-content tbody tr {
    transition: background-color 0.15s ease;
}

.article-body tbody tr:nth-child(even),
.article-content tbody tr:nth-child(even) {
    background: var(--color-bg);
}

.article-body tbody tr:nth-child(odd),
.article-content tbody tr:nth-child(odd) {
    background: var(--color-bg-secondary);
}

.article-body tr:hover,
.article-content tr:hover {
    background: var(--color-accent-light) !important;
}

/* 文章导航样式 */
.article-nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    padding: 16px 20px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    text-decoration: none;
    transition: all 0.2s;
}

.article-nav-link:hover {
    border-color: #D4D4D4;
    background: var(--color-bg-secondary);
}

.article-nav-link.prev {
    margin-right: 8px;
}

.article-nav-link.next {
    margin-left: 8px;
    text-align: right;
    justify-content: flex-end;
}

.article-nav-link.disabled {
    visibility: hidden;
}

.article-nav-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.article-nav-label {
    font-size: 12px;
    color: var(--color-text-muted);
}

.article-nav-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
}

.article-nav-link:hover .article-nav-title {
    color: var(--color-primary);
}

.article-nav-link svg {
    color: var(--color-text-muted);
    flex-shrink: 0;
}

/* 文章分类和元信息 */
.article-category {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    background: var(--color-primary-light);
    border-radius: 6px;
    font-size: 13px;
    color: var(--color-primary);
    text-decoration: none;
    transition: all 0.2s;
}

.article-category:hover {
    background: var(--color-primary);
    color: #FFFFFF;
}

.article-date,
.article-views {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--color-text-muted);
}

/* 相关文章 */
.related-articles {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

.related-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 20px;
}

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

.related-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
    text-decoration: none;
    transition: all 0.2s;
}

.related-link:hover {
    color: var(--color-primary);
}

.related-link:hover svg {
    transform: translateX(4px);
}

.related-link svg {
    color: var(--color-text-muted);
    transition: transform 0.2s;
}

.related-link-title {
    font-size: 15px;
}

/* 右侧目录 */
.toc-wrapper {
    flex-shrink: 0;
    width: var(--toc-width);
    position: relative;
}

.toc {
    width: var(--toc-width);
    position: fixed;
    top: var(--header-height);
    right: 0;
    bottom: 0;
    padding: 32px 16px;
    overflow-y: auto;
}

.toc-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: 16px;
    padding-left: 12px;
}

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

.toc-list,
.toc-children {
    list-style: none;
    margin: 0;
    padding: 0;
}

.toc-children {
    margin-left: 12px;
}

.toc-item {
    margin: 0;
}

.toc-link {
    display: block;
    padding: 6px 12px;
    font-size: 13px;
    color: var(--color-text-muted);
    text-decoration: none;
    border-left: 2px solid transparent;
    transition: all 0.15s;
    line-height: 1.4;
}

.toc-link:hover {
    color: var(--color-text-secondary);
}

.toc-link.active {
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    font-weight: 500;
}

/* 反馈区 */
.toc-feedback {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.toc-feedback-title {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 12px;
    padding-left: 12px;
}

.toc-feedback-buttons {
    display: flex;
    gap: 8px;
    padding-left: 12px;
}

.feedback-emoji {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
}

.feedback-emoji:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    transform: scale(1.1);
}

.feedback-emoji.selected {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    transform: scale(1.15);
}

.toc-feedback-thanks {
    display: none;
    align-items: center;
    gap: 8px;
    padding-left: 12px;
    font-size: 13px;
    color: var(--color-primary);
    animation: feedbackFadeIn 0.3s ease;
}

.toc-feedback-thanks svg {
    color: var(--color-primary);
    flex-shrink: 0;
}

@keyframes feedbackFadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 深色模式反馈按钮 */
[data-theme="dark"] .feedback-emoji {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--color-border);
}

[data-theme="dark"] .feedback-emoji:hover {
    background: var(--color-primary-light);
}

/* 文章导航 */
.article-nav {
    display: flex;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.article-nav-item {
    flex: 1;
    padding: 16px 20px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    text-decoration: none;
    transition: all 0.2s;
}

.article-nav-item.prev {
    border-radius: 8px 0 0 8px;
    border-right: none;
}

.article-nav-item.next {
    border-radius: 0 8px 8px 0;
    text-align: right;
}

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

.article-nav-label {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.article-nav-item.next .article-nav-label {
    justify-content: flex-end;
}

.article-nav-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
}

.article-nav-item:hover .article-nav-title {
    color: var(--color-primary);
}

/* 深色模式文章导航 */
[data-theme="dark"] .article-nav-item {
    background: var(--color-bg-secondary);
    border-color: var(--color-border);
}

[data-theme="dark"] .article-nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-border-hover);
}

[data-theme="dark"] .article-nav-link {
    background: var(--color-bg-secondary);
    border-color: var(--color-border);
}

[data-theme="dark"] .article-nav-link:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-border-hover);
}

/* 文章页脚 */
.article-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
}

.article-updated {
    font-size: 13px;
    color: var(--color-text-muted);
}

.theme-switcher {
    display: flex;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    overflow: hidden;
    background: var(--color-bg-secondary);
}

.theme-btn {
    width: 40px;
    height: 36px;
    border: none;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all 0.2s;
    border-right: 1px solid var(--color-border);
}

.theme-btn:last-child {
    border-right: none;
}

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

.theme-btn.active {
    color: var(--color-primary);
    background: var(--color-bg);
}

.theme-btn svg {
    width: 18px;
    height: 18px;
}

/* 深色模式主题切换器 */
[data-theme="dark"] .theme-switcher {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--color-border);
}

[data-theme="dark"] .theme-btn {
    border-right-color: var(--color-border);
}

[data-theme="dark"] .theme-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .theme-btn.active {
    background: rgba(255, 255, 255, 0.1);
}

/* ========================================
   分类和列表页面
   ======================================== */
.list-layout {
    display: flex;
    padding-top: var(--header-height);
    min-height: 100vh;
}

.list-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 40px 48px;
}

.category-header {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-border);
}

.category-header-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: var(--color-accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    flex-shrink: 0;
}

.category-header-content {
    flex: 1;
}

.category-header-title {
    font-family: var(--font-logo);
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.category-header-description {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

.category-header-count {
    font-size: 14px;
    color: var(--color-text-muted);
}

.article-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.article-list-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.2s;
}

.article-list-item:hover {
    border-color: var(--color-400);
    box-shadow:
        0 0 0 1px var(--color-400),
        0 4px 16px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.1);
    transform: translateX(4px);
}

.article-list-content {
    flex: 1;
    min-width: 0;
}

.article-list-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.article-list-summary {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    line-height: 1.5;
}

.article-list-meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--color-text-muted);
}

.article-list-arrow {
    color: var(--color-text-muted);
    flex-shrink: 0;
}

.article-list-item:hover .article-list-arrow {
    color: var(--color-primary);
}

/* 深色模式文章列表 */
[data-theme="dark"] .article-list-item {
    background: var(--color-bg-secondary);
    border-color: var(--color-border);
}

[data-theme="dark"] .article-list-item:hover {
    border-color: var(--color-400);
    box-shadow:
        0 0 0 1px var(--color-400),
        0 4px 16px hsla(var(--theme-h), var(--theme-s), 50%, 0.15);
    transform: translateX(4px);
}

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-muted);
}

.empty-state svg {
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 14px;
}

/* ========================================
   响应式适配
   ======================================== */
@media (max-width: 1200px) {
    .toc,
    .toc-wrapper {
        display: none;
    }

    .content-wrapper {
        margin-right: 0;
    }

    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 900px) {
    .sidebar {
        display: none;
    }

    .content-wrapper,
    .list-main {
        margin-left: 0;
    }

    .top-header {
        padding: 0 24px;
        grid-template-columns: 1fr 1fr;
    }

    .header-center {
        display: none;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 140px 24px 80px;
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .cards-section {
        padding: 60px 24px 80px;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }

    .popular-section {
        padding: 0 24px 80px;
    }

    .popular-grid {
        grid-template-columns: 1fr;
    }

    .contact-section {
        padding: 60px 24px;
    }

    .contact-options {
        flex-direction: column;
    }

    .contact-btn {
        width: 100%;
        justify-content: center;
    }

    .footer {
        padding: 24px;
    }

    .footer-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

@media (max-width: 600px) {
    .header-search {
        display: none;
    }

    .article-title {
        font-size: 26px;
    }

    .article-nav {
        flex-direction: column;
        gap: 8px;
    }

    .article-nav-item.prev,
    .article-nav-item.next {
        border-radius: 8px;
        border: 1px solid var(--color-border);
    }

    .content {
        padding: 32px 24px 60px;
    }

    .list-main {
        padding: 32px 24px;
    }
}

/* ========================================
   Video Detail Page Styles
   ======================================== */

.page-video .main-wrapper {
    padding-top: calc(var(--header-height) + 24px);
    padding-bottom: 80px;
}

.video-layout {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
}

.video-content {
    width: 100%;
}

/* Video Player */
.video-player-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 24px;
}

.video-player {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* Video Info */
.video-info {
    padding: 8px 0;
}

.video-title {
    font-family: var(--font-logo);
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.3;
    margin: 0 0 16px;
    letter-spacing: -0.02em;
}

.video-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 20px;
    margin-bottom: 24px;
    color: var(--color-text-muted);
    font-size: 14px;
}

.video-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.video-meta svg {
    width: 16px;
    height: 16px;
    opacity: 0.7;
}

.video-description {
    padding: 24px 0;
    border-top: 1px solid var(--color-border);
}

.video-description h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 12px;
}

.video-description p {
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin: 0;
}

/* Video Tags */
.video-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding-top: 20px;
}

.video-tags .tag {
    display: inline-block;
    padding: 6px 12px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 13px;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all 0.15s ease;
}

.video-tags .tag:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* Related Videos */
.related-videos {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

.related-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 24px;
}

.related-videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

.related-video-card {
    text-decoration: none;
    border-radius: 12px;
    overflow: hidden;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    transition: all 0.2s ease;
}

.related-video-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

[data-theme="dark"] .related-video-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.related-video-thumbnail {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    background: var(--color-bg-secondary);
}

.related-video-thumbnail img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.related-video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    padding: 3px 6px;
    background: rgba(0, 0, 0, 0.8);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    color: #fff;
}

.related-video-info {
    padding: 14px;
}

.related-video-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.4;
    margin: 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

@media (max-width: 768px) {
    .video-title {
        font-size: 22px;
    }

    .video-meta {
        gap: 12px;
        font-size: 13px;
    }

    .related-videos-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }
}

@media (max-width: 480px) {
    .related-videos-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Video List Page Styles - Grouped Layout
   ======================================== */

.page-video-list .main-wrapper {
    padding-top: calc(var(--header-height) + 48px);
    padding-bottom: 80px;
}

.video-page-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 页面头部 */
.video-page-header {
    margin-bottom: 48px;
}

.video-page-title {
    font-family: var(--font-logo);
    font-size: 36px;
    font-weight: 800;
    color: var(--color-text);
    letter-spacing: -0.02em;
    margin: 0 0 12px;
}

.video-page-desc {
    font-size: 18px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* 统计信息 */
.video-page-stats {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.video-stat-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.video-stat-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--color-bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
}

.video-stat-icon svg {
    width: 20px;
    height: 20px;
}

.video-stat-content {
    display: flex;
    flex-direction: column;
}

.video-stat-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
}

.video-stat-label {
    font-size: 13px;
    color: var(--color-text-muted);
}

/* 视频分类区块 */
.video-section {
    margin-bottom: 48px;
}

.video-section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.video-section-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.video-section-icon svg {
    width: 22px;
    height: 22px;
}

/* 分类图标颜色 */
.video-section-icon.primary {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

.video-section-icon.green {
    background: rgba(16, 185, 129, 0.1);
    color: #10B981;
}

.video-section-icon.blue {
    background: rgba(59, 130, 246, 0.1);
    color: #3B82F6;
}

.video-section-icon.purple {
    background: rgba(139, 92, 246, 0.1);
    color: #8B5CF6;
}

.video-section-icon.orange {
    background: rgba(249, 115, 22, 0.1);
    color: #F97316;
}

.video-section-icon.pink {
    background: rgba(236, 72, 153, 0.1);
    color: #EC4899;
}

[data-theme="dark"] .video-section-icon.green {
    background: rgba(16, 185, 129, 0.15);
}

[data-theme="dark"] .video-section-icon.blue {
    background: rgba(59, 130, 246, 0.15);
}

[data-theme="dark"] .video-section-icon.purple {
    background: rgba(139, 92, 246, 0.15);
}

[data-theme="dark"] .video-section-icon.orange {
    background: rgba(249, 115, 22, 0.15);
}

[data-theme="dark"] .video-section-icon.pink {
    background: rgba(236, 72, 153, 0.15);
}

.video-section-info {
    flex: 1;
}

.video-section-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 2px;
}

.video-section-count {
    font-size: 13px;
    color: var(--color-text-muted);
    margin: 0;
}

/* 视频列表组 */
.video-list-group {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
}

.video-list-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
    text-decoration: none;
    transition: background 0.15s;
}

.video-list-item:last-child {
    border-bottom: none;
}

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

/* 播放按钮 */
.video-play-btn {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    flex-shrink: 0;
    transition: all 0.2s;
}

.video-play-btn svg {
    width: 18px;
    height: 18px;
    margin-left: 2px;
}

.video-list-item:hover .video-play-btn {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #FFFFFF;
}

/* 视频信息 */
.video-item-info {
    flex: 1;
    min-width: 0;
}

.video-item-title {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 4px;
    transition: color 0.15s;
}

.video-list-item:hover .video-item-title {
    color: var(--color-primary);
}

.video-item-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--color-text-muted);
}

.video-item-duration-text {
    display: flex;
    align-items: center;
    gap: 4px;
}

.video-item-duration-text svg {
    width: 14px;
    height: 14px;
}

.video-item-tag {
    color: var(--color-text-muted);
}

/* 视频时长徽章 */
.video-item-duration {
    padding: 6px 10px;
    background: var(--color-bg-secondary);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

/* 已观看标记 */
.video-watched-badge {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    background: rgba(16, 185, 129, 0.1);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    color: #10B981;
    flex-shrink: 0;
}

.video-watched-badge svg {
    width: 12px;
    height: 12px;
}

/* 新视频标记 */
.video-new-badge {
    padding: 4px 8px;
    background: #FEF3C7;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    color: #B45309;
    text-transform: uppercase;
    flex-shrink: 0;
}

[data-theme="dark"] .video-new-badge {
    background: rgba(245, 158, 11, 0.2);
    color: #FBBF24;
}

/* 响应式 */
@media (max-width: 768px) {
    .video-page-title {
        font-size: 28px;
    }

    .video-page-stats {
        flex-wrap: wrap;
        gap: 16px;
    }

    .video-list-item {
        padding: 12px 16px;
    }

    .video-item-meta {
        display: none;
    }

    .video-watched-badge span:not(svg) {
        display: none;
    }

    .video-watched-badge {
        padding: 6px;
    }
}

/* ========================================
   FAQ Document Page Styles - Three Column Layout
   ======================================== */

/* 三栏文档布局 */
.page-faq-doc {
    --doc-sidebar-width: 260px;
    --doc-toc-width: 220px;
}

.doc-layout {
    display: flex;
    padding-top: var(--header-height);
    min-height: 100vh;
}

/* 左侧导航侧边栏 */
.doc-sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: var(--doc-sidebar-width);
    height: calc(100vh - var(--header-height));
    background: var(--color-bg);
    border-right: 1px solid var(--color-border);
    overflow-y: auto;
    padding: 20px 0;
    z-index: 10;
}

.doc-sidebar::-webkit-scrollbar {
    width: 4px;
}

.doc-sidebar::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 2px;
}

.doc-sidebar .sidebar-section {
    margin-bottom: 8px;
}

.doc-sidebar .sidebar-title {
    padding: 16px 20px 8px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
}

.doc-sidebar .sidebar-nav {
    list-style: none;
    margin: 0;
    padding: 0;
}

.doc-sidebar .sidebar-item {
    margin: 0;
}

.doc-sidebar .sidebar-link {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 20px;
    font-size: 14px;
    line-height: 1.4;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all 0.15s;
    cursor: pointer;
}

.doc-sidebar .sidebar-link:hover {
    color: var(--color-text);
    background: var(--color-bg-secondary);
}

.doc-sidebar .sidebar-link.active {
    color: var(--color-primary);
    background: hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.08);
    font-weight: 500;
}

.doc-sidebar .sidebar-link svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    margin-top: 2px;
    opacity: 0.5;
}

.doc-sidebar .sidebar-link:hover svg {
    opacity: 0.8;
}

.doc-sidebar .sidebar-link.active svg {
    opacity: 1;
    color: var(--color-primary);
}

/* 中间内容区 */
.doc-content-wrapper {
    flex: 1;
    margin-left: var(--doc-sidebar-width);
    margin-right: var(--doc-toc-width);
    min-width: 0;
    border-right: 1px solid var(--color-border);
}

.doc-content {
    max-width: 720px;
    margin: 0 auto;
    padding: 48px 40px 80px;
}

/* 文章样式 */
.doc-article h1 {
    font-family: var(--font-logo);
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.25;
    letter-spacing: -0.02em;
    margin: 0 0 16px;
}

.doc-lead {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin: 0 0 32px;
    line-height: 1.6;
}

.doc-body {
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-text-secondary);
}

.doc-body h2 {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-text);
    margin: 48px 0 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
}

.doc-body h2:first-child {
    margin-top: 0;
}

.doc-body h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    margin: 32px 0 12px;
}

.doc-body p {
    margin: 0 0 16px;
}

.doc-body ul,
.doc-body ol {
    margin: 0 0 16px;
    padding-left: 24px;
}

.doc-body li {
    margin-bottom: 8px;
}

.doc-body a {
    color: var(--color-primary);
    text-decoration: none;
}

.doc-body a:hover {
    text-decoration: underline;
}

.doc-body blockquote {
    margin: 16px 0;
    padding: 12px 16px;
    background: hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.06);
    border-left: 3px solid var(--color-primary);
    border-radius: 0 8px 8px 0;
}

.doc-body blockquote p {
    margin: 0;
}

/* 上一篇/下一篇导航 */
.doc-nav {
    display: flex;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.doc-nav-item {
    flex: 1;
    padding: 16px 20px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    text-decoration: none;
    transition: all 0.2s;
}

.doc-nav-item.prev {
    border-radius: 8px 0 0 8px;
    border-right: none;
}

.doc-nav-item.next {
    border-radius: 0 8px 8px 0;
    text-align: right;
}

.doc-nav-item.empty,
.doc-nav-item.disabled {
    background: transparent;
    border-color: transparent;
    pointer-events: none;
}

.doc-nav-item:not(.empty):hover {
    background: var(--color-bg-secondary);
}

.doc-nav-label {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.doc-nav-item.next .doc-nav-label {
    justify-content: flex-end;
}

.doc-nav-label svg {
    width: 14px;
    height: 14px;
}

.doc-nav-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
}

.doc-nav-item:not(.empty):hover .doc-nav-title {
    color: var(--color-primary);
}

/* 页脚 */
.doc-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
}

.doc-updated {
    font-size: 13px;
    color: var(--color-text-muted);
}

/* 右侧目录 */
.doc-toc {
    position: fixed;
    top: var(--header-height);
    right: 0;
    width: var(--doc-toc-width);
    height: calc(100vh - var(--header-height));
    background: var(--color-bg);
    padding: 32px 16px;
    overflow-y: auto;
}

.doc-toc .toc-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: 16px;
    padding-left: 12px;
}

.doc-toc .toc-nav {
    display: flex;
    flex-direction: column;
}

.doc-toc .toc-link {
    display: block;
    padding: 6px 12px;
    font-size: 13px;
    color: var(--color-text-muted);
    text-decoration: none;
    border-left: 2px solid transparent;
    transition: all 0.15s;
    line-height: 1.4;
}

.doc-toc .toc-link:hover {
    color: var(--color-text-secondary);
}

.doc-toc .toc-link.active {
    color: var(--color-primary);
    border-left-color: var(--color-primary);
    font-weight: 500;
}

.doc-toc .toc-link-sub {
    padding-left: 24px;
    font-size: 12px;
}

/* 反馈区域 */
.toc-feedback {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.toc-feedback-title {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-bottom: 12px;
    padding-left: 12px;
}

.toc-feedback-buttons {
    display: flex;
    gap: 8px;
    padding-left: 12px;
}

.feedback-emoji {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
}

.feedback-emoji:hover {
    border-color: var(--color-primary);
    background: hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.08);
    transform: scale(1.1);
}

/* 响应式 */
@media (max-width: 1200px) {
    .doc-toc {
        display: none;
    }
    .doc-content-wrapper {
        margin-right: 0;
        border-right: none;
    }
}

@media (max-width: 900px) {
    .doc-sidebar {
        display: none;
    }
    .doc-content-wrapper {
        margin-left: 0;
    }
    .doc-content {
        padding: 32px 24px 60px;
    }
}

@media (max-width: 600px) {
    .doc-article h1 {
        font-size: 26px;
    }
    .doc-content {
        padding: 24px 16px 60px;
    }
    .doc-nav {
        flex-direction: column;
    }
    .doc-nav-item.prev,
    .doc-nav-item.next {
        border-radius: 8px;
        border: 1px solid var(--color-border);
    }
    .doc-nav-item.prev {
        margin-bottom: 8px;
    }
}

.faq-answer p + p {
    margin-top: 12px;
}

/* FAQ CTA Section - 使用品牌色渐变 */
.faq-cta {
    margin-top: 64px;
    padding: 48px 40px;
    background: linear-gradient(135deg, 
        hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.08),
        hsla(var(--theme-h), var(--theme-s), calc(var(--theme-l) - 10%), 0.04)
    );
    border: 1px solid hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.15);
    border-radius: 20px;
    text-align: center;
}

.faq-cta-content {
    max-width: 480px;
    margin: 0 auto 24px;
}

.faq-cta h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 10px;
}

.faq-cta p {
    font-size: 15px;
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.6;
}

.faq-cta-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--color-primary);
    color: white;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.2s;
    box-shadow: 0 4px 12px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.25);
}

.faq-cta-button:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px hsla(var(--theme-h), var(--theme-s), var(--theme-l), 0.35);
}

.faq-cta a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--color-primary);
    color: white;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 12px;
    transition: var(--transition-fast);
}

.faq-cta a:hover {
    background: var(--color-primary-hover);
}

/* ========================================
   List Header (shared for video/article lists)
   ======================================== */

.list-header {
    margin-bottom: 32px;
}

.list-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 8px;
}

.list-description {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin: 0 0 8px;
    line-height: 1.6;
}

.list-count {
    font-size: 14px;
    color: var(--color-text-muted);
}

/* ========================================
   Empty State
   ======================================== */

.empty-state {
    text-align: center;
    padding: 80px 24px;
    color: var(--color-text-muted);
}

.empty-state svg {
    margin-bottom: 24px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 8px;
}

.empty-state p {
    font-size: 15px;
    margin: 0;
}

/* ========================================
   Responsive Adjustments for Video/FAQ
   ======================================== */

@media (max-width: 768px) {
    .videos-grid,
    .videos-grid.large {
        grid-template-columns: 1fr;
    }

    .faq-title {
        font-size: 28px;
    }

    .faq-cta {
        padding: 32px 24px;
    }

    .list-title {
        font-size: 26px;
    }
}

/* ========== FAQ 列表页样式 - 参考设计优化版 ========== */
.page-faq-list {
    background: var(--color-bg);
    min-height: 100vh;
}

/* 三栏主布局 - 使用 flex 布局 */
.faq-layout {
    display: flex;
    min-height: calc(100vh - var(--header-height));
}

/* ===== 左侧分类导航 ===== */
.faq-sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background: var(--color-bg);
    overflow-y: auto;
    padding: 16px 0;
}

.faq-sidebar::-webkit-scrollbar {
    width: 4px;
}

.faq-sidebar::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 2px;
}

.faq-sidebar-section {
    margin-bottom: 8px;
}

.faq-sidebar-title {
    padding: 16px 20px 8px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
}

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

.faq-nav-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 7px 20px;
    font-size: 14px;
    line-height: 1.4;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all 0.15s;
    cursor: pointer;
}

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

.faq-nav-item.active {
    color: var(--color-accent);
    background: var(--color-accent-light);
    font-weight: 500;
}

.faq-nav-item .nav-emoji {
    font-size: 16px;
    flex-shrink: 0;
    margin-top: 2px;
    opacity: 0.5;
}

.faq-nav-item:hover .nav-emoji {
    opacity: 0.8;
}

.faq-nav-item.active .nav-emoji {
    opacity: 1;
}

.faq-nav-item .nav-text {
    flex: 1;
}

.faq-nav-item .nav-badge {
    display: none;
}

/* ===== 中间内容区 ===== */
.faq-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    margin-right: var(--toc-width);
    min-width: 0;
}

.faq-content-inner {
    max-width: 720px;
    margin: 0 auto;
    padding: 48px 40px 80px;
}

.faq-breadcrumb {
    display: none;
}

.faq-page-title {
    font-family: var(--font-logo);
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.25;
    letter-spacing: -0.02em;
    margin: 0 0 16px 0;
}

.faq-page-desc {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin: 0 0 32px 0;
    line-height: 1.6;
}

/* FAQ 分类区块 */
.faq-section {
    margin-bottom: 0;
    scroll-margin-top: calc(var(--header-height) + 20px);
}

.faq-section-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-text);
    margin-top: 48px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: 10px;
}

.faq-section:first-of-type .faq-section-title {
    margin-top: 0;
}

.faq-section-title span:first-child {
    font-size: 22px;
}

/* FAQ 列表项 - 复用 sidebar-nav 样式 */
.faq-section .sidebar-nav {
    list-style: none;
    margin: 0;
    padding: 0;
}

.faq-section .sidebar-item {
    margin: 0;
}

.faq-section .sidebar-link {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 7px 0;
    font-size: 14px;
    line-height: 1.4;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all 0.15s;
}

.faq-section .sidebar-link:hover {
    color: var(--color-text);
}

.faq-section .sidebar-link svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    margin-top: 2px;
    opacity: 0.5;
}

.faq-section .sidebar-link:hover svg {
    opacity: 0.8;
}

/* ===== 右侧目录导航 ===== */
.faq-toc {
    position: fixed;
    top: var(--header-height);
    right: 0;
    width: var(--toc-width);
    height: calc(100vh - var(--header-height));
    background: var(--color-bg);
    padding: 32px 16px;
    overflow-y: auto;
}

.faq-toc-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: 16px;
    padding-left: 12px;
}

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

.faq-toc-item {
    display: block;
    padding: 6px 12px;
    font-size: 13px;
    color: var(--color-text-muted);
    text-decoration: none;
    border-left: 2px solid transparent;
    transition: all 0.15s;
    line-height: 1.4;
    cursor: pointer;
}

.faq-toc-item:hover {
    color: var(--color-text-secondary);
}

.faq-toc-item.active {
    color: var(--color-accent);
    border-left-color: var(--color-accent);
    font-weight: 500;
}

/* 帮助反馈卡片 */
.faq-help-card {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.faq-help-card-title {
    font-size: 13px;
    color: var(--color-text-muted);
    margin: 0 0 12px 12px;
}

.faq-help-card-text {
    display: none;
}

.faq-help-card-btn {
    display: none;
}

/* 表情反馈按钮 */
.faq-feedback-buttons {
    display: flex;
    gap: 8px;
    padding-left: 12px;
}

.feedback-emoji {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
}

.feedback-emoji:hover {
    border-color: var(--color-accent);
    background: var(--color-accent-light);
    transform: scale(1.1);
}

/* 空状态 */
.faq-empty {
    text-align: center;
    padding: 80px 24px;
    background: var(--color-bg);
}

.faq-empty-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    color: var(--color-text-muted);
}

.faq-empty-icon svg {
    width: 100%;
    height: 100%;
}

.faq-empty-text {
    font-size: 15px;
    color: var(--color-text-secondary);
    margin: 0;
}

/* ===== 深色模式适配 ===== */
[data-theme="dark"] .faq-nav-item.active {
    background: var(--color-accent-light);
}

[data-theme="dark"] .faq-q-icon {
    background: var(--color-accent-light);
}

[data-theme="dark"] .faq-item.open .faq-q-icon {
    background: var(--color-accent);
}

[data-theme="dark"] .feedback-emoji {
    background: var(--color-bg-secondary);
    border-color: var(--color-border);
}

[data-theme="dark"] .feedback-emoji:hover {
    background: var(--color-accent-light);
    border-color: var(--color-accent);
}

/* ===== 响应式适配 ===== */

/* 中屏：隐藏右侧目录 */
@media (max-width: 1200px) {
    .faq-toc {
        display: none;
    }
    
    .faq-content {
        margin-right: 0;
    }
}

/* 小屏：隐藏左侧边栏 */
@media (max-width: 900px) {
    .faq-sidebar {
        display: none;
    }
    
    .faq-content {
        margin-left: 0;
    }
    
    .faq-content-inner {
        padding: 32px 24px 60px;
    }
}

/* 超小屏 */
@media (max-width: 600px) {
    .faq-page-title {
        font-size: 26px;
    }
    
    .faq-content-inner {
        padding: 24px 16px 60px;
    }
    
    .faq-section-title {
        font-size: 18px;
    }
}