/* -*- conding: utf-8 -*- */
/*region*/
/* https://prismjs.com/download#themes=prism-dark&languages=markup+css+clike+javascript+abap+abnf+actionscript+ada+agda+al+antlr4+apacheconf+apex+apl+applescript+aql+arduino+arff+armasm+arturo+asciidoc+aspnet+asm6502+asmatmel+autohotkey+autoit+avisynth+avro-idl+awk+bash+basic+batch+bbcode+bbj+bicep+birb+bison+bnf+bqn+brainfuck+brightscript+bro+bsl+c+csharp+cpp+cfscript+chaiscript+cil+cilkc+cilkcpp+clojure+cmake+cobol+coffeescript+concurnas+csp+cooklang+coq+crystal+css-extras+csv+cue+cypher+d+dart+dataweave+dax+dhall+diff+django+dns-zone-file+docker+dot+ebnf+editorconfig+eiffel+ejs+elixir+elm+etlua+erb+erlang+excel-formula+fsharp+factor+false+firestore-security-rules+flow+fortran+ftl+gml+gap+gcode+gdscript+gedcom+gettext+gherkin+git+glsl+gn+linker-script+go+go-module+gradle+graphql+groovy+haml+handlebars+haskell+haxe+hcl+hlsl+hoon+http+hpkp+hsts+ichigojam+icon+icu-message-format+idris+ignore+inform7+ini+io+j+java+javadoc+javadoclike+javastacktrace+jexl+jolie+jq+jsdoc+js-extras+json+json5+jsonp+jsstacktrace+js-templates+julia+keepalived+keyman+kotlin+kumir+kusto+latex+latte+less+lilypond+liquid+lisp+livescript+llvm+log+lolcode+lua+magma+makefile+markdown+markup-templating+mata+matlab+maxscript+mel+mermaid+metafont+mizar+mongodb+monkey+moonscript+n1ql+n4js+nand2tetris-hdl+naniscript+nasm+neon+nevod+nginx+nim+nix+nsis+objectivec+ocaml+odin+opencl+openqasm+oz+parigp+parser+pascal+pascaligo+psl+pcaxis+peoplecode+perl+php+phpdoc+php-extras+plant-uml+plsql+powerquery+powershell+processing+prolog+promql+properties+protobuf+pug+puppet+pure+purebasic+purescript+python+qsharp+q+qml+qore+r+racket+cshtml+jsx+tsx+reason+regex+rego+renpy+rescript+rest+rip+roboconf+robotframework+ruby+rust+sas+sass+scss+scala+scheme+shell-session+smali+smalltalk+smarty+sml+solidity+solution-file+soy+sparql+splunk-spl+sqf+sql+squirrel+stan+stata+iecst+stylus+supercollider+swift+systemd+t4-templating+t4-cs+t4-vb+tap+tcl+tt2+textile+toml+tremor+turtle+twig+typescript+typoscript+unrealscript+uorazor+uri+v+vala+vbnet+velocity+verilog+vhdl+vim+visual-basic+warpscript+wasm+web-idl+wgsl+wiki+wolfram+wren+xeora+xml-doc+xojo+xquery+yaml+yang+zig&plugins=line-numbers+show-language+inline-color+toolbar+copy-to-clipboard+download-button */
/**
 * prism.js Dark theme for JavaScript, CSS and HTML
 * Based on the slides of the talk “/Reg(exp){2}lained/”
 * @author Lea Verou
 */

@font-face {
	font-family: "JetBrains Mono";
	src: url("JetBrainsMono.ttf") format("truetype");
}

code[class*="language-"],
pre[class*="language-"] {
	color: white;
	background: none;
	text-shadow: 0 -.1em .2em black;
	font-size: 1em;
	text-align: left;
	font-family: "JetBrains Mono",system-ui;
	white-space: pre;
	word-spacing: normal;
	word-break: normal;
	word-wrap: normal;
	line-height: 1.5;

	-moz-tab-size: 4;
	-o-tab-size: 4;
	tab-size: 4;

	-webkit-hyphens: none;
	-moz-hyphens: none;
	-ms-hyphens: none;
	hyphens: none;
}

@media print {
	code[class*="language-"],
	pre[class*="language-"] {
		text-shadow: none;
	}
}

pre[class*="language-"],
:not(pre) > code[class*="language-"] {
	background: rgba(0,0,0,50%);
}

/* Code blocks */
pre[class*="language-"] {
	padding: 1em;
	margin: .5em 0;
	overflow: auto;
	/* border: .3em solid hsl(30, 20%, 40%); */
	border-radius: .5em;
	/* box-shadow: 1px 1px .5em black inset; */
}

/* Inline code */
:not(pre) > code[class*="language-"] {
	padding: .15em .2em .05em;
	border-radius: .3em;
	border: .13em solid hsl(30, 20%, 40%);
	box-shadow: 1px 1px .3em -.1em black inset;
	white-space: normal;
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
	color: hsl(30, 20%, 50%);
}

.token.punctuation {
	opacity: .7;
}

.token.namespace {
	opacity: .7;
}

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol {
	color: hsl(350, 40%, 70%);
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
	color: hsl(75, 70%, 60%);
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string,
.token.variable {
	color: hsl(40, 90%, 60%);
}

.token.atrule,
.token.attr-value,
.token.keyword {
	color: hsl(350, 40%, 70%);
}

.token.regex,
.token.important {
	color: #e90;
}

.token.important,
.token.bold {
	font-weight: bold;
}
.token.italic {
	font-style: italic;
}

.token.entity {
	cursor: help;
}

.token.deleted {
	color: red;
}

pre[class*="language-"].line-numbers {
	position: relative;
	padding-left: 3.8em;
	counter-reset: linenumber;
}

pre[class*="language-"].line-numbers > code {
	position: relative;
	white-space: inherit;
}

.line-numbers .line-numbers-rows {
	position: absolute;
	pointer-events: none;
	top: 0;
	font-size: 100%;
	left: -3.8em;
	width: 3em; /* works for line-numbers below 1000 lines */
	letter-spacing: -1px;
	border-right: 1px solid #999;

	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;

}

	.line-numbers-rows > span {
		display: block;
		counter-increment: linenumber;
	}

		.line-numbers-rows > span:before {
			content: counter(linenumber);
			color: #999;
			display: block;
			padding-right: 0.8em;
			text-align: right;
		}

div.code-toolbar {
	position: relative;
}

div.code-toolbar > .toolbar {
	position: absolute;
	z-index: 10;
	top: .3em;
	right: .2em;
	transition: opacity 0.3s ease-in-out;
	opacity: 0;
}

div.code-toolbar:hover > .toolbar {
	opacity: 1;
}

/* Separate line b/c rules are thrown out if selector is invalid.
   IE11 and old Edge versions don't support :focus-within. */
div.code-toolbar:focus-within > .toolbar {
	opacity: 1;
}

div.code-toolbar > .toolbar > .toolbar-item {
	display: inline-block;
}

div.code-toolbar > .toolbar > .toolbar-item > a {
	cursor: pointer;
}

div.code-toolbar > .toolbar > .toolbar-item > button {
	background: none;
	border: 0;
	color: inherit;
	font: inherit;
	line-height: normal;
	overflow: visible;
	padding: 0;
	-webkit-user-select: none; /* for button */
	-moz-user-select: none;
	-ms-user-select: none;
}

div.code-toolbar > .toolbar > .toolbar-item > a,
div.code-toolbar > .toolbar > .toolbar-item > button,
div.code-toolbar > .toolbar > .toolbar-item > span {
	color: #bbb;
	font-size: .8em;
	padding: 0 .5em;
	background: #f5f2f0;
	background: rgba(224, 224, 224, 0.2);
	box-shadow: 0 2px 0 0 rgba(0,0,0,0.2);
	border-radius: .5em;
}

div.code-toolbar > .toolbar > .toolbar-item > a:hover,
div.code-toolbar > .toolbar > .toolbar-item > a:focus,
div.code-toolbar > .toolbar > .toolbar-item > button:hover,
div.code-toolbar > .toolbar > .toolbar-item > button:focus,
div.code-toolbar > .toolbar > .toolbar-item > span:hover,
div.code-toolbar > .toolbar > .toolbar-item > span:focus {
	text-decoration: none;
	color: #fff; text-shadow: 0 0 8px rgba(255,255,255,0.85), 0 0 16px rgba(255,255,255,0.5);
}

span.inline-color-wrapper {
	/*
	 * The background image is the following SVG inline in base 64:
	 *
	 * <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 2 2">
	 *     <path fill="gray" d="M0 0h2v2H0z"/>
	 *     <path fill="white" d="M0 0h1v1H0zM1 1h1v1H1z"/>
	 * </svg>
	 *
	 * SVG-inlining explained:
	 * https://stackoverflow.com/a/21626701/7595472
	 */
	background: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAyIDIiPjxwYXRoIGZpbGw9ImdyYXkiIGQ9Ik0wIDBoMnYySDB6Ii8+PHBhdGggZmlsbD0id2hpdGUiIGQ9Ik0wIDBoMXYxSDB6TTEgMWgxdjFIMXoiLz48L3N2Zz4=");
	/* This is to prevent visual glitches where one pixel from the repeating pattern could be seen. */
	background-position: center;
	background-size: 110%;

	display: inline-block;
	height: 1.333ch;
	width: 1.333ch;
	margin: 0 .333ch;
	box-sizing: border-box;
	border: 1px solid white;
	/* outline: 1px solid rgba(0,0,0,.5); */
	overflow: hidden;
}

span.inline-color {
	display: block;
	/* To prevent visual glitches again */
	height: 120%;
	width: 120%;
}
/*endregion*/

:root {
    /* 尺寸 */
    --page-width: 65%;
    --page-margin: 15%;

    /* 导航 */
    --nav-height: 56px;
    --nav-gap: 0; /* 0 表示紧贴 nav */

    /* 间距 */
    --gap-between: 5px; /* main 与 copyright 的间距 */
    --copyright-min: 5vh; /* 版权区最小高度（用于计算） */
    --copyright-max: 15vh; /* 版权区最大高度（用于计算） */

    /* 视觉 */
    --card-bg: rgba(0,0,0,0.5);
    --card-radius: 25px;
    --card-padding: 1% 2% 2%;
    --card-padding-bottom: 2.5%;
    --backdrop: blur(5px);
    --muted: #999999;
    --muted-dark: #555555;

    /* 字体 */
    --mono-font: "JetBrains Mono";
    --tahoma-font: Tahoma, system-ui, sans-serif;

    /* 背景图 */
    --bg-img: url("bg.jpg");
}

/* 基础布局与盒模型 */
html { box-sizing: border-box; }
*, *::before, *::after { box-sizing: inherit; }

body {
    margin: 0;
    /* 为固定导航在文档流中预留空间，防止覆盖内容 */
    padding-top: calc(var(--nav-height) + var(--nav-gap));
    background-image: var(--bg-img);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
    background-attachment: fixed;
    min-height: 100vh;
    background-color: var(--muted-dark);
    /* 禁止页面整体垂直滚动，#main 内滚 */
    overflow-x: hidden;
    overflow-y: hidden;
}

body.line-numbers { min-height: 100vh; }

/* 公共卡片外观（毛玻璃） */
#main, #copyright, .notice, .card {
    display: block;
    background: var(--card-bg);
    backdrop-filter: var(--backdrop);
    border-radius: var(--card-radius);
    padding: var(--card-padding);
    box-sizing: border-box;
}

/* 顶部导航（固定） */
#topnav {
    position: fixed;
    left: var(--page-margin);
    right: var(--page-margin);
    top: 0;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    padding: 0 1rem;
    background: rgba(0,0,0,0.85);
    backdrop-filter: var(--backdrop);
    border-radius: calc(var(--card-radius) / 2);
    /* 移除底部圆角，避免与下面内容边缘重叠 */
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    z-index: 60;
    box-sizing: border-box;
}

#topnav .nav-inner { display:flex; gap:1rem; align-items:center; width:100%; }
#topnav a { color: var(--muted); text-decoration:none; padding:0.4rem 0.6rem; transition: color .15s ease, text-shadow .2s ease; }
#topnav a:hover { color: #fff; text-shadow: 0 0 8px rgba(255,255,255,0.85), 0 0 16px rgba(255,255,255,0.5); }

/* 占位器：用于在文档流中为固定导航预留空间，避免覆盖后续内容 */
#nav-spacer { height: var(--nav-height); margin: 0 var(--page-margin); pointer-events: none; }

/* 主内容：流式布局，顶部紧贴导航，内部滚动 */
#main {
    width: auto;
    /* 移除顶部圆角，避免与固定导航圆角叠加 */
    border-top-left-radius: 0;
    border-top-right-radius: 0;
    /* 顶部间距由 body 的 padding-top 提供，避免重叠 */
    margin-top: 0;
    padding-top: 0;
    margin-left: var(--page-margin);
    margin-right: var(--page-margin);
    margin-bottom: calc(var(--copyright-min) + var(--gap-between));
    max-width: calc(100% - 2 * var(--page-margin));
    overflow-y: auto;   /* 内部滚动 */
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-gutter: stable both-edges;
    padding-bottom: var(--gap-between);
    /* 可用高度 = 视口 - 导航高度 - 版权最小高度 - 间隙 */
    max-height: calc(100vh - var(--nav-height) - var(--copyright-max) - var(--gap-between));
    z-index: 10;
}

/* 滚动条样式（仅影响 #main） */
#main::-webkit-scrollbar { width:8px; height:8px; }
#main::-webkit-scrollbar-track { background: rgba(255,255,255,0.02); border-radius:4px; }
#main::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.10); border-radius:4px; }
#main { scrollbar-width: thin; scrollbar-color: rgba(255,255,255,0.10) rgba(255,255,255,0.02); }

/* 版权区（固定底部） */
#copyright {
    position: fixed;
    left: var(--page-margin);
    right: var(--page-margin);
    bottom: 0;
    min-height: var(--copyright-min);
    max-height: var(--copyright-max);
    padding: 1% 2% var(--card-padding-bottom);
    z-index: 30;
}

#copyright p { text-align:center; margin:0; }
h1 { text-align: center; margin: 0; }
p,h2,h3,h4,h5,h6 { text-align: left;  }

/* 字体 & 文本 */
@font-face{ font-family: "JetBrains Mono"; src: url("JetBrainsMono.ttf") format("truetype"); }
.chinese{ font-family: var(--tahoma-font); color: var(--muted); }
.english{ font-family: var(--mono-font), system-ui; color: var(--muted); }
.fl { text-align: left; }
.fc { text-align: center; }
.fr { text-align: right; }
a { color: var(--muted); }
.funny:active { color: #fff; text-shadow: 0 0 8px rgba(255,255,255,0.85), 0 0 16px rgba(255,255,255,0.5); }
code, pre{ font-family: var(--mono-font), system-ui; }

/* 使带 class="chinese" 的有序/无序列表整体居中，且点/序号与文本一起居中显示 */
hr { border: 1px solid var(--muted); }
ul { margin: 0 auto;width: fit-content;color: var(--muted); }

.no_print { display: none; }