/**
 * 文档中心 - 对标 docs.trae.cn 风格（亮/暗双主题）
 */

/* ========== 主题变量 ========== */
:root {
    --primary: #4e6ef2;
    --primary-hover: #3d5ae0;
    --primary-soft: rgba(78, 110, 242, 0.1);
    --primary-soft-hover: rgba(78, 110, 242, 0.16);

    --bg: #ffffff;
    --bg-secondary: #f7f8fa;
    --bg-hover: #f2f3f5;
    --bg-elevated: #ffffff;

    --text: #1f2329;
    --text-secondary: #51565d;
    --text-tertiary: #8f959e;

    --border: #e5e6eb;
    --border-strong: #d8dadf;

    --topbar-bg: rgba(255, 255, 255, 0.82);
    --sidebar-bg: #fbfbfc;

    --tip-bg: #f0f5ff;
    --tip-border: #4e6ef2;
    --tip-warn-bg: #fff7e6;
    --tip-warn-border: #ff9f0a;

    --shadow-sm: 0 1px 2px rgba(31, 35, 41, 0.06);
    --shadow-md: 0 4px 16px rgba(31, 35, 41, 0.1);

    --radius: 8px;
    --radius-sm: 6px;
    --topbar-height: 60px;
    --transition: all 0.2s ease;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --code-font: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', Consolas, monospace;
}

:root[data-theme="dark"] {
    --primary: #7c93f5;
    --primary-hover: #94a6f7;
    --primary-soft: rgba(124, 147, 245, 0.16);
    --primary-soft-hover: rgba(124, 147, 245, 0.24);

    --bg: #1e1f23;
    --bg-secondary: #17181a;
    --bg-hover: #2a2b30;
    --bg-elevated: #26272b;

    --text: #e8e9ea;
    --text-secondary: #b3b7bd;
    --text-tertiary: #7d828a;

    --border: #34363c;
    --border-strong: #45484f;

    --topbar-bg: rgba(23, 24, 26, 0.82);
    --sidebar-bg: #17181a;

    --tip-bg: rgba(124, 147, 245, 0.12);
    --tip-border: #7c93f5;
    --tip-warn-bg: rgba(255, 159, 10, 0.12);
    --tip-warn-border: #ff9f0a;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 15px;
    line-height: 1.75;
    color: var(--text);
    background-color: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 100%;
    min-height: 100vh;
}

/* ========== 顶栏 ========== */
.topbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--topbar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.topbar-inner {
    height: var(--topbar-height);
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.sidebar-toggle {
    display: none;
    width: 34px;
    height: 34px;
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text);
}

.brand-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 8px;
    color: #fff;
    flex-shrink: 0;
}

.brand-logo img {
    width: 20px;
    height: 20px;
    object-fit: contain;
}

.brand-name {
    font-size: 16px;
    font-weight: 600;
    white-space: nowrap;
}

/* 顶栏搜索 */
.search-container {
    position: relative;
    flex: 1;
    max-width: 520px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    height: 36px;
    padding: 0 44px 0 38px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 13.5px;
    background: var(--bg-secondary);
    color: var(--text);
    transition: var(--transition);
    outline: none;
}

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

.search-input:focus {
    border-color: var(--primary);
    background: var(--bg);
    box-shadow: 0 0 0 3px var(--primary-soft);
}

.search-container::before {
    content: '';
    position: absolute;
    left: 13px;
    top: 50%;
    transform: translateY(-50%);
    width: 15px;
    height: 15px;
    background: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill='%238f959e' d='M15.5 14h-.79l-.28-.27C15.41 12.59 16 11.11 16 9.5 16 5.91 13.09 3 9.5 3S3 5.91 3 9.5 5.91 16 9.5 16c1.61 0 3.09-.59 4.23-1.57l.27.28v.79l5 4.99L20.49 19l-4.99-5zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z'/%3E%3C/svg%3E") no-repeat center;
    background-size: contain;
    pointer-events: none;
}

.search-kbd {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    min-width: 18px;
    height: 18px;
    padding: 0 4px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 11px;
    line-height: 16px;
    text-align: center;
    color: var(--text-tertiary);
    background: var(--bg);
    pointer-events: none;
}

.search-container.has-value .search-kbd {
    display: none;
}

.search-clear {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 22px;
    height: 22px;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* 顶栏右侧 */
.topbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 20px;
    white-space: nowrap;
}

.header-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.header-nav a:hover {
    color: var(--text);
}

.theme-toggle {
    width: 34px;
    height: 34px;
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

/* 亮色下显示月亮（点击切暗色），暗色下显示太阳 */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* ========== 主体布局 ========== */
.layout {
    display: flex;
    align-items: flex-start;
}

/* 左侧边栏 */
.sidebar {
    width: 264px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    flex-shrink: 0;
    position: sticky;
    top: var(--topbar-height);
    height: calc(100vh - var(--topbar-height));
    padding: 16px 12px 32px;
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

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

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 3px;
}

.nav-title {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: var(--text-tertiary);
    padding: 4px 10px 10px;
}

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

/* 分组 */
.nav-category {
    margin-bottom: 2px;
}

.category-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 7px 10px;
    color: var(--text);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    user-select: none;
}

.category-header:hover {
    background: var(--bg-hover);
}

.category-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.category-toggle {
    display: flex;
    align-items: center;
    color: var(--text-tertiary);
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.nav-category.collapsed .category-toggle {
    transform: rotate(-90deg);
}

/* 分组文件列表 */
.category-files {
    list-style: none;
    overflow: hidden;
}

.nav-item {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-item a {
    display: block;
    padding: 6px 10px 6px 22px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 13.5px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    text-overflow: ellipsis;
}

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

.nav-item a.active {
    color: var(--primary);
    background: var(--primary-soft);
    font-weight: 500;
}

/* 移动端遮罩 */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 90;
    opacity: 0;
    transition: opacity 0.25s ease;
}

/* ========== 内容区 ========== */
.content-wrapper {
    flex: 1;
    display: flex;
    min-width: 0;
}

.content {
    flex: 1;
    min-width: 0;
    padding: 32px 48px 64px;
}

/* 面包屑 */
.breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 13px;
    color: var(--text-tertiary);
    margin-bottom: 12px;
    min-height: 20px;
}

.breadcrumb:empty {
    display: none;
}

.breadcrumb .crumb-link {
    color: var(--text-tertiary);
    text-decoration: none;
    transition: var(--transition);
}

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

.breadcrumb .crumb-sep {
    color: var(--border-strong);
}

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

/* 加载状态 */
#loading {
    display: none;
    justify-content: center;
    align-items: center;
    height: 400px;
    flex-direction: column;
    gap: 20px;
}

.spinner {
    width: 36px;
    height: 36px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    color: var(--text-tertiary);
    font-size: 14px;
}

/* ========== Markdown 内容 ========== */
#content {
    max-width: 100%;
    word-wrap: break-word;
}

#content h1 {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.35;
    color: var(--text);
    margin: 8px 0 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

/* 下载文档按钮 */
.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: transparent;
    border: 1px solid var(--border-strong);
    color: var(--text-secondary) !important;
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    transition: var(--transition);
    flex-shrink: 0;
    line-height: 1.4;
}

.download-btn:hover {
    border-color: var(--primary);
    color: var(--primary) !important;
    text-decoration: none;
    background: var(--primary-soft);
}

#content h2 {
    font-size: 24px;
    font-weight: 650;
    color: var(--text);
    margin: 40px 0 16px;
    line-height: 1.4;
}

#content h3 {
    font-size: 19px;
    font-weight: 600;
    color: var(--text);
    margin: 28px 0 12px;
}

#content h4 {
    font-size: 16.5px;
    font-weight: 600;
    color: var(--text);
    margin: 22px 0 10px;
}

#content h5, #content h6 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-secondary);
    margin: 20px 0 8px;
}

#content p {
    margin: 0 0 16px;
    color: var(--text);
}

#content ul, #content ol {
    margin: 0 0 16px;
    padding-left: 26px;
}

#content li {
    margin-bottom: 6px;
}

#content li::marker {
    color: var(--text-tertiary);
}

#content a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

#content a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

#content strong {
    color: var(--text);
    font-weight: 600;
}

#content img {
    max-width: 100%;
    border-radius: var(--radius);
}

/* 表格 */
#content table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 13.5px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

#content th {
    background: var(--bg-secondary);
    color: var(--text);
    font-weight: 600;
    text-align: left;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
}

#content td {
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
    color: var(--text-secondary);
}

#content tr:last-child td {
    border-bottom: none;
}

#content tr:hover td {
    background: var(--bg-hover);
}

/* 代码块：两种主题下均保持深色（github-dark），暗色下以边框区分 */
#content pre {
    background: #0d1117;
    border: 1px solid rgba(240, 246, 252, 0.1);
    border-radius: var(--radius);
    padding: 0;
    margin: 16px 0;
    overflow: hidden;
    position: relative;
    transition: max-height 0.3s ease;
}

#content pre .code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 7px 12px;
    background: #161b22;
    border-bottom: 1px solid #30363d;
    flex-shrink: 0;
}

#content pre .code-header-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

#content pre .code-header-right {
    display: flex;
    align-items: center;
    gap: 6px;
}

#content pre::-webkit-scrollbar-track {
    background: #0d1117;
}

#content pre::-webkit-scrollbar-thumb {
    background: #30363d;
    border-radius: 4px;
}

#content pre::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

#content pre .code-body {
    padding: 14px 18px;
    overflow-x: auto;
    max-height: 600px;
    overflow-y: auto;
    transition: max-height 0.3s ease;
}

#content pre.collapsed .code-body {
    max-height: 150px;
    overflow-y: hidden;
}

#content pre code {
    display: block;
    white-space: pre;
    word-wrap: normal;
    tab-size: 4;
    background: transparent;
    outline: none;
    box-shadow: none;
}

#content code {
    font-family: var(--code-font);
    font-size: 13px;
    line-height: 1.6;
}

#content p code, #content li code, #content td code {
    background: var(--primary-soft);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--primary);
    font-size: 13px;
}

.code-language {
    font-size: 11px;
    color: #8b949e;
    font-family: var(--code-font);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.collapse-btn,
.copy-btn {
    padding: 3px 10px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 4px;
    color: #c9d1d9;
    font-size: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.collapse-btn:hover,
.copy-btn:hover {
    background: rgba(255, 255, 255, 0.16);
    color: #ffffff;
}

.copy-btn.copied {
    background: rgba(63, 185, 80, 0.25);
    border-color: rgba(63, 185, 80, 0.5);
    color: #7ee787;
}

/* 引用块：提示卡片化 */
#content blockquote {
    margin: 16px 0;
    padding: 12px 18px;
    border-left: 3px solid var(--tip-border);
    background: var(--tip-bg);
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.8;
}

#content blockquote p {
    margin: 0 0 8px;
}

#content blockquote p:last-child {
    margin-bottom: 0;
}

/* 嵌套引用降级为普通样式 */
#content blockquote blockquote {
    margin: 8px 0;
    padding: 8px 14px;
    border-left-color: var(--tip-warn-border);
    background: var(--tip-warn-bg);
}

/* 分割线 */
#content hr {
    border: none;
    height: 1px;
    background: var(--border);
    margin: 32px 0;
}

/* ========== 上一篇 / 下一篇 ========== */
.prev-next {
    display: flex;
    gap: 16px;
    margin-top: 48px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.prev-next:empty {
    display: none;
}

.prev-next .pn-link {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    text-decoration: none;
    transition: var(--transition);
}

.prev-next .pn-link:hover {
    border-color: var(--primary);
    background: var(--primary-soft);
}

.prev-next .pn-next {
    text-align: right;
    align-items: flex-end;
}

.prev-next .pn-label {
    font-size: 12px;
    color: var(--text-tertiary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.prev-next .pn-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.prev-next .pn-link:hover .pn-title {
    color: var(--primary);
}

.prev-next .pn-placeholder {
    flex: 1;
}

/* ========== 右侧目录 ========== */
.toc {
    width: 240px;
    flex-shrink: 0;
    position: sticky;
    top: var(--topbar-height);
    height: calc(100vh - var(--topbar-height));
    overflow-y: auto;
    padding: 32px 20px 32px 8px;
}

.toc::-webkit-scrollbar {
    width: 6px;
}

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

.toc::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 3px;
}

.toc-header {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    padding: 0 12px 10px;
    border-left: 2px solid var(--border);
}

#toc-nav {
    border-left: 2px solid var(--border);
    padding: 2px 0 12px;
}

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

.toc-item {
    margin: 0;
}

.toc-item a {
    display: block;
    padding: 5px 12px;
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 13px;
    line-height: 1.5;
    transition: var(--transition);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

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

.toc-item a.active {
    color: var(--primary);
    font-weight: 500;
}

.toc-h2 a { padding-left: 12px; }
.toc-h3 a { padding-left: 26px; font-size: 12.5px; }
.toc-h4 a { padding-left: 40px; font-size: 12px; }
.toc-h5 a { padding-left: 52px; font-size: 12px; }
.toc-h6 a { padding-left: 62px; font-size: 12px; }

.toc-empty {
    padding: 8px 12px;
    color: var(--text-tertiary);
    font-size: 13px;
}

/* ========== 返回顶部 ========== */
.back-to-top {
    position: fixed;
    right: 28px;
    bottom: 28px;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px);
    transition: all 0.3s ease;
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    color: var(--primary);
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

/* ========== 搜索结果 ========== */
.search-results {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    max-height: 480px;
    overflow-y: auto;
    z-index: 1000;
    display: none;
}

.search-results.show {
    display: block;
}

.search-result-item {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item:hover {
    background: var(--primary-soft);
}

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

.search-result-category {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-bottom: 6px;
}

.search-result-preview {
    font-size: 12.5px;
    color: var(--text-secondary);
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.search-result-highlight {
    background: rgba(255, 200, 60, 0.35);
    color: inherit;
    padding: 0 1px;
    border-radius: 2px;
}

:root[data-theme="dark"] .search-result-highlight {
    background: rgba(255, 200, 60, 0.25);
}

.search-no-results {
    padding: 28px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 14px;
}

/* ========== 状态展示 ========== */
.error-container {
    text-align: center;
    padding: 60px 20px;
}

.error-icon {
    font-size: 44px;
    margin-bottom: 16px;
}

.error-message {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.retry-btn {
    padding: 8px 24px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    transition: var(--transition);
}

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

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-tertiary);
}

.empty-state h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

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

/* ========== 响应式 ========== */
@media (max-width: 1280px) {
    .toc {
        display: none;
    }
}

@media (max-width: 960px) {
    .header-nav {
        display: none;
    }
}

@media (max-width: 768px) {
    .topbar-inner {
        padding: 0 16px;
        gap: 12px;
    }

    .sidebar-toggle {
        display: flex;
    }

    .brand-name {
        display: none;
    }

    .sidebar {
        position: fixed;
        left: 0;
        top: var(--topbar-height);
        z-index: 95;
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        box-shadow: none;
        padding-top: 12px;
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-md);
    }

    .sidebar-overlay.active {
        display: block;
        opacity: 1;
    }

    .content {
        padding: 24px 20px 48px;
    }

    #content h1 {
        font-size: 25px;
        flex-wrap: wrap;
    }

    #content h2 {
        font-size: 20px;
    }

    #content h3 {
        font-size: 17px;
    }

    .prev-next {
        flex-direction: column;
    }

    .prev-next .pn-next {
        text-align: left;
        align-items: flex-start;
    }

    #content table {
        font-size: 12.5px;
    }

    #content th, #content td {
        padding: 8px 10px;
    }

    .back-to-top {
        right: 18px;
        bottom: 18px;
        width: 38px;
        height: 38px;
    }
}

/* ========== 打印 ========== */
@media print {
    .sidebar, .toc, .back-to-top, .topbar, .breadcrumb, .prev-next, .sidebar-overlay {
        display: none !important;
    }

    .content {
        max-width: 100%;
        padding: 0;
    }

    #content pre {
        white-space: pre-wrap;
        word-wrap: break-word;
    }
}