:root {
    /* 纸张风格护眼配色 */
    --paper-bg: #fdf6e3;           /* 背景 */
    --paper-text: #524336;         /* 文字 */
    --paper-title: #8b7355;        /* 标题 */
    --paper-link: #956922;         /* 链接 */
    --paper-link-hover: #5e4f3d;   /* 链接悬停 */
    --paper-border: #e8e0cc;       /* 边框 */
    --paper-sidebar: #ddd6c1;      /* 侧边栏 */
    --paper-code-bg: #f5f1e4;      /* 背景 */
    --paper-active-tab: #eee7cc;   /* 活动标签 */
    --paper-shadow: rgba(156, 142, 113, 0.1); /* 阴影 */
    --sidebar-width: 240px;        /* 侧边栏默认宽度 */
    --sidebar-collapsed-width: 0px; /* 侧边栏收起宽度 */
    --sidebar-min-width: 160px;    /* 侧边栏最小宽度 */
    --sidebar-max-width: 360px;    /* 侧边栏最大宽度 */
    --toggle-size: 40px;           /* 切换按钮大小 */
    --toggle-margin: 10px;         /* 切换按钮边距 */
}

/* 应用纸张风格配色到全站 */
body {
    font-family: "Noto Serif", "Libre Baskerville", Georgia, serif; /* 衬线字体更有纸质阅读感 */
    font-size: 16px;  /* 字体大小 */
    line-height: 1.7;
    color: var(--paper-text);
    background-color: var(--paper-bg);
    display: flex;
    margin: 0;
    padding: 0;
    transition: margin-left 0.3s;
}

/* 侧边栏开关按钮 */
.sidebar-toggle {
    position: fixed;
    top: var(--toggle-margin);
    left: var(--toggle-margin);
    width: var(--toggle-size);
    height: var(--toggle-size);
    background-color: var(--paper-sidebar);
    color: var(--paper-title);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 5px var(--paper-shadow);
    z-index: 1000;
    transition: left 0.3s;
}

body.sidebar-collapsed .sidebar-toggle {
    left: calc(var(--toggle-margin) + var(--sidebar-collapsed-width));
}

/* 侧边栏样式 */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-min-width);
    max-width: var(--sidebar-max-width);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    background-color: var(--paper-sidebar);
    border-right: 1px solid var(--paper-border);
    padding: 20px;
    box-sizing: border-box;
    overflow-y: auto;
    transition: transform 0.3s ease;
    resize: horizontal;
    z-index: 900;
    overflow-y: scroll;
    scrollbar-width: none;
}

.sidebar-resizer {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 5px;
    cursor: ew-resize;
    background-color: var(--paper-border);
}

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

.sidebar-header {
    border-bottom: 1px solid var(--paper-border);
    padding-bottom: 15px;
    margin-bottom: 15px;
    position: sticky;
    top: 0;
    background-color: var(--paper-sidebar);
    z-index: 10;
    padding-top: 10px;
}

.sidebar-header h2 {
    color: var(--paper-title);
    margin: 0;
    padding: 0;
}

#sidebar-content {
    max-width: 100%;
    overflow-x: hidden;
}

#toc {
    list-style-type: none;
    padding-left: 0;
}

#toc ul {
    list-style-type: none;
    padding-left: 10px; /* 减少缩进 */
}

#toc li {
    margin: 3px 0;
    white-space: normal; /* 允许文字换行 */
    word-wrap: break-word; /* 确保长词汇能够换行 */
    overflow-wrap: break-word;
}

#toc a {
    display: block;
    padding: 5px;
    color: var(--paper-link);
    text-decoration: none;
    border-bottom: 1px solid var(--paper-border);
    transition: all 0.2s ease;
    font-size: 0.95em;
    overflow: hidden;
    text-overflow: ellipsis;
}

#toc a:hover {
    color: var(--paper-link-hover);
    padding-left: 8px;
    background-color: rgba(255, 255, 255, 0.3);
}

/* 主内容区样式 */
main {
    margin-left: var(--sidebar-width);
    padding: 30px 40px;
    width: calc(100% - var(--sidebar-width));
    box-sizing: border-box;
    background-color: var(--paper-bg);
    transition: margin-left 0.3s, width 0.3s;
}

body.sidebar-collapsed main {
    margin-left: 0;
    width: 100%;
}

h1, h2, h3, h4, h5 {
    font-family: "Noto Sans", Arial, sans-serif; /* 为标题使用不同的字体 */
    margin-top: 1.5em;
    margin-bottom: 0.8em;
    color: var(--paper-title);
    font-weight: 600;
}

h1 {
    font-size: 2.5em;
    border-bottom: 2px solid var(--paper-border);
    padding-bottom: 10px;
    margin-bottom: 30px;
}

h2 {
    font-size: 1.8em;
}

h3 {
    font-size: 1.5em;
}

h4 {
    font-size: 1.2em;
}

h5 {
    font-size: 1em;
}

a {
    color: var(--paper-link);
    text-decoration: none;
}

a:hover {
    color: var(--paper-link-hover);
    text-decoration: underline;
}

/* 代码容器样式 */
.code-container {
    margin: 20px 0;
    border: 1px solid var(--paper-border);
    border-radius: 6px;
    overflow: hidden;
    box-shadow: 0 2px 8px var(--paper-shadow);
}

.code-tabs {
    display: flex;
    background-color: var(--paper-sidebar);
    border-bottom: 1px solid var(--paper-border);
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: none;
    cursor: pointer;
    font-weight: 500;
    color: var(--paper-text);
    transition: background-color 0.2s;
    outline: none;
}

.tab-btn:hover {
    background-color: rgba(0, 0, 0, 0.02);
}

.tab-btn.active {
    background-color: var(--paper-active-tab);
    border-bottom: 2px solid var(--paper-link);
}

.code-blocks {
    position: relative;
    background-color: var(--paper-code-bg);
}

.code-block {
    display: none;
    padding: 15px;
    overflow-x: auto;
}

.code-block.active {
    display: block;
}

/* 代码高亮样式提升 */
pre {
    background-color: var(--paper-code-bg) !important;
    border: 1px solid var(--paper-border);
    border-radius: 4px;
    padding: 15px;
    overflow-x: auto;
}

code {
    font-family: "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    font-size: 0.9em;
    background-color: var(--paper-code-bg);
    color: #5c4b3c;
    padding: 2px 4px;
    border-radius: 3px;
    border: 1px solid var(--paper-border);
}

/* 确保代码块中的代码不受行内代码样式影响 */
.code-block code {
    background-color: transparent;
    padding: 0;
    border: none;
}

/* LaTeX 公式样式 */
.MathJax {
    color: var(--paper-text) !important;
    font-size: 1.1em !important;
}

/* 行间公式居中显示 */
.MathJax_Display {
    margin: 1em 0 !important;
    text-align: center;
    overflow-x: auto;
    overflow-y: hidden;
}

/* 公式编号样式 */
.mjx-eqn-num {
    color: var(--paper-link);
    font-style: italic;
}

/* 表格样式 */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

th, td {
    padding: 12px;
    text-align: left;
    border: 1px solid var(--paper-border);
}

th {
    background-color: var(--paper-sidebar);
    font-weight: 600;
    color: var(--paper-text);
}

tr:nth-child(even) {
    background-color: rgba(248, 245, 228, 0.5);
}

/* Highlight.js 主题定制 */
.hljs {
    background-color: var(--paper-code-bg) !important;
    color: #5c4b3c !important;
    display: block;
    overflow-x: auto;
    padding: 0.5em;
}
.hljs-keyword,
.hljs-selector-tag,
.hljs-title,
.hljs-section,
.hljs-doctag,
.hljs-name,
.hljs-strong {
    color: #859900 !important;
    font-weight: bold;
}
.hljs-type {
    color: #3b7dd1 !important;
    font-weight: bold;
}
.hljs-number {
    color: #d33682 !important;
}
.hljs-comment {
    color: #998066 !important;
    font-style: italic;
}
.hljs-string,
.hljs-title,
.hljs-section,
.hljs-built_in,
.hljs-literal,
.hljs-addition,
.hljs-tag,
.hljs-quote,
.hljs-name,
.hljs-selector-id,
.hljs-selector-class {
    color: #2aa198 !important;
}

.hljs-meta,
.hljs-subst,
.hljs-symbol,
.hljs-regexp,
.hljs-attribute,
.hljs-deletion,
.hljs-variable,
.hljs-template-variable,
.hljs-link,
.hljs-bullet {
    color: #966483 !important;
}

/* 添加纸张质感 */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background-image: url("data:image/png;base64,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");
    opacity: 0.1;
}