/* Tailwind CSS CDN */
@import url('https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css');

/* 自定义颜色变量 - 亮色主题 */
:root {
    --primary-color: #0969DA;
    --secondary-color: #1F883D;
    --background-white: #FFFFFF;
    --background-gray: #F6F8FA;
    --background-dark: #1E293B;
    --text-primary: #24292F;
    --text-secondary: #57606A;
    --text-muted: #8B949E;
    --border-color: #D0D7DE;
    --hover-background: #EAEFF2;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

    /* CSDN风格代码块配色 - 亮色主题 */
    --code-block-bg: #F8F9FA;
    --code-toolbar-bg: #F3F4F6;
    --code-line-number-color: #999999;
    --code-text-color: #24292F;
    --hljs-keyword: #C678DD;
    --hljs-string: #98C379;
    --hljs-number: #A0A0A0;
    --hljs-comment: #999999;
    --hljs-function: #61AEEE;
    --hljs-class: #E5C07B;
}

/* 暗色主题 */
[data-theme="dark"] {
    --background-white: #0D1117;
    --background-gray: #161B22;
    --text-primary: #E6EDF3;
    --text-secondary: #8B949E;
    --text-muted: #6E7681;
    --border-color: #30363D;
    --hover-background: #21262D;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);

    /* CSDN风格代码块配色 - 暗色主题 */
    --code-block-bg: #161B22;
    --code-toolbar-bg: #21262D;
    --code-line-number-color: #6E7681;
    --code-text-color: #E6EDF3;
    --hljs-keyword: #FF7B72;
    --hljs-string: #A5D6FF;
    --hljs-number: #79C0FF;
    --hljs-comment: #6E7681;
    --hljs-function: #D2A8FF;
    --hljs-class: #FFD700;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    color: var(--text-primary);
    background-color: var(--background-gray);
    line-height: 1.6;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* 顶部导航栏 */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 56px;
    background-color: var(--background-white);
    border-bottom: 1px solid var(--border-color);
    padding: 0 24px;
    box-shadow: var(--shadow-sm);
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--primary-color);
}

.app-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.refresh-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    background-color: var(--background-white);
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.refresh-btn:hover {
    background-color: var(--hover-background);
    color: var(--primary-color);
}

.refresh-btn svg {
    width: 20px;
    height: 20px;
}

/* 主题切换按钮 */
.theme-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    background-color: var(--background-white);
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

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

.theme-toggle-btn .sun-icon {
    width: 20px;
    height: 20px;
    display: block;
}

.theme-toggle-btn .moon-icon {
    width: 20px;
    height: 20px;
    display: none;
}

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

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

/* 主内容区 */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* 左侧边栏 */
.sidebar {
    width: 280px;
    background-color: var(--background-gray);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tree-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: auto;
    padding: 8px 0;
}

.loading {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
    font-size: 14px;
}

/* 目录树样式 */
.tree-node {
    cursor: pointer;
    user-select: none;
}

.tree-content {
    display: flex;
    align-items: center;
    padding: 6px 12px;
    transition: background-color 0.15s ease;
}

.tree-content:hover {
    background-color: var(--hover-background);
}

.tree-content.active {
    background-color: #ddf4ff;
    border-left: 2px solid var(--primary-color);
}

.tree-icon {
    width: 16px;
    height: 16px;
    margin-right: 8px;
    flex-shrink: 0;
    color: var(--text-secondary);
}

.tree-content.active .tree-icon {
    color: var(--primary-color);
}

.tree-label {
    flex: 1;
    font-size: 14px;
    color: var(--text-primary);
    white-space: nowrap;
}

.tree-children {
    margin-left: 16px;
    border-left: 1px solid var(--border-color);
}

.tree-children.collapsed {
    display: none;
}

.toggle-icon {
    width: 12px;
    height: 12px;
    margin-right: 4px;
    transition: transform 0.2s ease;
}

.toggle-icon.expanded {
    transform: rotate(90deg);
}

/* 右侧文档展示区 */
.document-viewer {
    flex: 1;
    background-color: var(--background-white);
    overflow-y: auto;
    padding: 0;
    height: 100%;
}

.document-content {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 16px;
    display: flex;
    flex-direction: column;
    min-height: 100%;
    box-sizing: border-box;
}

.welcome-message {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
}

.welcome-message svg {
    width: 80px;
    height: 80px;
    margin-bottom: 24px;
    opacity: 0.5;
}

.welcome-message h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.welcome-message p {
    font-size: 14px;
    color: var(--text-muted);
}

/* Markdown内容样式 */
.markdown-content {
    line-height: 1.8;
}

.markdown-content h1 {
    font-size: 32px;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.markdown-content h2 {
    font-size: 24px;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.markdown-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-top: 24px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.markdown-content h4 {
    font-size: 16px;
    font-weight: 600;
    margin-top: 20px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.markdown-content p {
    margin-bottom: 16px;
    color: var(--text-primary);
}

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

.markdown-content a:hover {
    text-decoration: underline;
}

.markdown-content ul,
.markdown-content ol {
    margin-bottom: 16px;
    padding-left: 32px;
    color: var(--text-primary);
}

.markdown-content li {
    margin-bottom: 8px;
}

/* Markdown代码块样式 - CSDN风格 */
.markdown-content code {
    background-color: rgba(0, 0, 0, 0.05);
    padding: 2px 4px;
    border-radius: 3px;
    font-family: 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    color: var(--code-text-color);
}

.markdown-content pre {
    background-color: var(--code-block-bg);
    border: 1px solid #E1E4E8;
    border-radius: 8px;
    padding: 0;
    margin: 0;
    overflow-x: auto;
    position: relative;
}

.markdown-content pre code {
    background-color: transparent;
    padding: 16px;
    color: var(--code-text-color);
    font-size: 14px;
    line-height: 1.6;
    font-family: 'Fira Code', 'Consolas', 'Monaco', 'Courier New', monospace;
}

/* Highlight.js语法高亮样式覆盖 - CSDN配色 */
.hljs {
    background: transparent;
    padding: 16px;
}

.hljs-comment,
.hljs-quote {
    color: var(--hljs-comment);
    font-style: italic;
}

.hljs-keyword,
.hljs-selector-tag,
.hljs-title,
.hljs-section {
    color: var(--hljs-keyword);
    font-weight: bold;
}

.hljs-string,
.hljs-title.class_,
.hljs-title.class_.inherited__,
.hljs-title.function_ {
    color: var(--hljs-string);
}

.hljs-number,
.hljs-meta {
    color: var(--hljs-number);
}

.hljs-built_in,
.hljs-class {
    color: var(--hljs-class);
}

.hljs-function {
    color: var(--hljs-function);
}

.hljs-literal {
    color: var(--hljs-string);
}

.hljs-attr {
    color: #C678DD;
}

.hljs-variable {
    color: #24292F;
}

.hljs-type {
    color: #E5C07B;
}

.hljs-tag {
    color: #0969DA;
}

.markdown-content blockquote {
    border-left: 4px solid var(--border-color);
    padding-left: 16px;
    margin: 16px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.markdown-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 16px;
}

.markdown-content th,
.markdown-content td {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    text-align: left;
}

.markdown-content th {
    background-color: var(--background-gray);
    font-weight: 600;
}

.markdown-content img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    margin: 16px 0;
}

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

/* HTML内容样式 */
.html-content {
    line-height: 1.8;
    color: var(--text-primary);
}

.html-content * {
    max-width: 100%;
}

/* CSDN风格代码块工具栏 */
.code-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background-color: #F3F4F6;
    border: 1px solid #E1E4E8;
    border-bottom: none;
    border-radius: 8px 8px 0 0;
    font-size: 12px;
}

.code-language {
    display: flex;
    align-items: center;
    gap: 6px;
    color: #666666;
    font-weight: 500;
}

.code-language-icon {
    width: 16px;
    height: 16px;
}

.code-language-text {
    font-family: 'Arial', sans-serif;
}

.code-actions {
    display: flex;
    gap: 8px;
}

.code-copy-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background-color: #0969DA;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Arial', sans-serif;
}

.code-copy-btn:hover {
    background-color: #005CC5;
}

.code-copy-btn.copied {
    background-color: #1F883D;
}

.code-copy-btn svg {
    width: 14px;
    height: 14px;
}

/* CSDN风格代码块行号 */
.code-line-numbers {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 50px;
    background-color: #F3F4F6;
    border-right: 1px solid #E1E4E8;
    border-radius: 8px 0 0 0;
    padding: 16px 0;
    text-align: right;
    color: var(--code-line-number-color);
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 14px;
    line-height: 1.6;
    user-select: none;
    overflow: hidden;
}

.code-line-numbers .line-number {
    display: block;
    padding: 0 8px 0 0;
    color: #999999;
    font-size: 13px;
}

.code-content-with-lines {
    padding-left: 50px !important;
    background-color: transparent;
}

/* PDF展示 */
.pdf-container {
    width: 100%;
    height: 100%;
    overflow: auto;
    padding: 0;
}

.pdf-container iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

/* PDF文档内容特殊处理 - 移除padding以铺满容器 */
.document-content .pdf-container {
    padding: 0;
}

/* PDF专用文档内容容器 - 移除所有padding */
.document-content-pdf {
    padding: 0;
    width: 100%;
    height: 100%;
}

.document-content-pdf .pdf-container {
    height: 100%;
}

/* 纯文本内容 */
.text-content {
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-primary);
}

/* 底部状态栏 */
.footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 32px;
    background-color: var(--background-gray);
    border-top: 1px solid var(--border-color);
    padding: 0 12px 24px;
    font-size: 12px;
    color: var(--text-muted);
    box-sizing: border-box;
}

.footer-left,
.footer-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .sidebar {
        width: 240px;
    }

    .document-content {
        padding: 32px 24px;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 0 16px;
    }

    .app-title {
        display: none;
    }

    .sidebar {
        position: fixed;
        left: 0;
        top: 56px;
        bottom: 32px;
        width: 280px;
        transform: translateX(-100%);
        z-index: 50;
        box-shadow: var(--shadow-lg);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .document-content {
        padding: 24px 16px;
    }

    .footer {
        padding: 0 16px;
    }
}

@media (max-width: 480px) {
    .document-content {
        padding: 16px 12px;
    }

    .markdown-content h1 {
        font-size: 24px;
    }

    .markdown-content h2 {
        font-size: 20px;
    }

    .markdown-content h3 {
        font-size: 18px;
    }
}

/* 滚动条样式 */
.tree-container::-webkit-scrollbar,
.document-viewer::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.tree-container::-webkit-scrollbar-track,
.document-viewer::-webkit-scrollbar-track {
    background: transparent;
}

.tree-container::-webkit-scrollbar-thumb,
.document-viewer::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.tree-container::-webkit-scrollbar-thumb:hover,
.document-viewer::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ========== 新增样式 ========== */

/* 侧边栏切换按钮 */
.sidebar-toggle-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-color);
    background-color: var(--background-white);
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s ease;
    margin-right: 8px;
}

.sidebar-toggle-btn:hover {
    background-color: var(--hover-background);
    color: var(--primary-color);
}

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

/* 目录（TOC）面板 */
.toc-panel {
    position: sticky;
    top: 80px;
    right: 20px;
    width: 250px;
    max-height: calc(100vh - 120px);
    background-color: var(--background-white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    overflow-y: auto;
    padding: 16px;
    z-index: 50;
}

.toc-empty {
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    padding: 20px;
}

/* TOC 列表 */
.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-list.level-0 > .toc-item {
    padding-left: 0;
}

.toc-list.level-1 > .toc-item {
    padding-left: 16px;
}

.toc-list.level-2 > .toc-item {
    padding-left: 32px;
}

.toc-list.level-3 > .toc-item {
    padding-left: 48px;
}

.toc-list.level-4 > .toc-item {
    padding-left: 64px;
}

.toc-list.level-5 > .toc-item {
    padding-left: 80px;
}

/* TOC 项 */
.toc-item {
    margin-bottom: 4px;
    border-radius: 4px;
    transition: all 0.15s ease;
}

.toc-link {
    display: block;
    padding: 6px 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    border-radius: 4px;
    transition: all 0.15s ease;
}

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

.toc-item.active .toc-link {
    background-color: #ddf4ff;
    color: var(--primary-color);
    font-weight: 500;
    border-left: 2px solid var(--primary-color);
}

.toc-sublist {
    list-style: none;
    padding: 0;
    margin-top: 4px;
    margin-bottom: 4px;
}

/* Mermaid 图表样式 */
.mermaid-chart-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 24px 0;
    padding: 20px;
    background-color: var(--background-white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.mermaid-chart-wrapper svg {
    max-width: 100%;
    height: auto;
}

/* Mermaid 错误样式 */
.mermaid-error {
    background-color: #FFF1F0;
    border: 1px solid #FCA5A5;
    border-radius: 8px;
    padding: 16px;
    margin: 24px 0;
}

.mermaid-error-header {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #DC2626;
    font-weight: 500;
    margin-bottom: 8px;
}

.mermaid-error-header svg {
    width: 20px;
    height: 20px;
}

.mermaid-error-message {
    color: #DC2626;
    font-size: 14px;
    margin-bottom: 12px;
}

.mermaid-error-code {
    background-color: var(--code-block-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 12px;
    overflow-x: auto;
}

.mermaid-error-code pre {
    margin: 0;
    padding: 0;
}

.mermaid-error-code code {
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* 响应式侧边栏 */
.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar.expanded {
    transform: translateX(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .sidebar-toggle-btn {
        display: flex;
    }

    .app-title {
        display: none;
    }

    .sidebar {
        position: fixed;
        left: 0;
        top: 56px;
        bottom: 32px;
        width: 280px;
        transform: translateX(-100%);
        z-index: 100;
        box-shadow: var(--shadow-lg);
        transition: transform 0.3s ease;
    }

    .sidebar.collapsed {
        transform: translateX(-100%);
    }

    .sidebar.expanded {
        transform: translateX(0);
    }

    .document-viewer {
        margin-left: 0;
    }

    .toc-panel {
        display: none;
    }
}

/* 移动端 TOC（抽屉样式） */
@media (max-width: 768px) {
    .toc-panel.mobile-toc {
        position: fixed;
        top: 56px;
        left: 0;
        right: 0;
        bottom: 32px;
        width: 100%;
        max-width: 300px;
        margin: 0 auto;
        border-radius: 0;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        z-index: 150;
    }

    .toc-panel.mobile-toc.active {
        transform: translateX(0);
    }

    /* 添加 TOC 切换按钮 */
    .toc-toggle-btn {
        display: flex;
    }
}

/* 暗色主题下的 Mermaid 图表 */
[data-theme="dark"] .mermaid-chart-wrapper {
    background-color: #1F2937;
    border-color: #374151;
}

[data-theme="dark"] .mermaid-error {
    background-color: #450A0A;
    border-color: #7F1D1D;
}

[data-theme="dark"] .mermaid-error-header,
[data-theme="dark"] .mermaid-error-message {
    color: #FCA5A5;
}

/* 平滑滚动增强 */
.smooth-scroll {
    scroll-behavior: smooth;
}

/* 目录导航动画 */
.toc-link {
    position: relative;
}

.toc-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background-color: var(--primary-color);
    transition: height 0.2s ease;
    border-radius: 2px;
}

.toc-link:hover::before,
.toc-item.active .toc-link::before {
    height: 16px;
}