*{-webkit-font-smoothing:antialiased;-webkit-overflow-scrolling:touch;-webkit-tap-highlight-color:rgba(0,0,0,0);-webkit-text-size-adjust:none;-webkit-touch-callout:none;box-sizing:border-box}body:not(.ready){overflow:hidden}body:not(.ready) .app-nav,body:not(.ready)>nav,body:not(.ready) [data-cloak]{display:none}div#app{font-size:30px;font-weight:lighter;margin:40vh auto;text-align:center}div#app:empty:before{content:"Loading..."}img.emoji{height:1.2em}img.emoji,span.emoji{vertical-align:middle}span.emoji{font-family:Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji;font-size:1.2em}.progress{background-color:#42b983;background-color:var(--theme-color,#42b983);height:2px;left:0;position:fixed;right:0;top:0;transition:width .2s,opacity .4s;width:0;z-index:999999}.search .search-keyword,.search a:hover{color:#42b983;color:var(--theme-color,#42b983)}.search .search-keyword{font-style:normal;font-weight:700}body,html{height:100%}body{-moz-osx-font-smoothing:grayscale;-webkit-font-smoothing:antialiased;color:#34495e;font-family:Source Sans Pro,Helvetica Neue,Arial,sans-serif;font-size:15px;letter-spacing:0;margin:0;overflow-x:hidden}img{max-width:100%}a[disabled]{cursor:not-allowed;opacity:.6}kbd{border:1px solid #ccc;border-radius:3px;display:inline-block;font-size:12px!important;line-height:12px;margin-bottom:3px;padding:3px 5px;vertical-align:middle}li input[type=checkbox]{margin:0 .2em .25em 0;vertical-align:middle}.app-nav{margin:25px 60px 0 0;position:absolute;right:0;text-align:right;z-index:10}.app-nav.no-badge{margin-right:25px}.app-nav p{margin:0}.app-nav>a{margin:0 1rem;padding:5px 0}.app-nav li,.app-nav ul{display:inline-block;list-style:none;margin:0}.app-nav a{color:inherit;font-size:16px;text-decoration:none;transition:color .3s}.app-nav a.active,.app-nav a:hover{color:#42b983;color:var(--theme-color,#42b983)}.app-nav a.active{border-bottom:2px solid #42b983;border-bottom:2px solid var(--theme-color,#42b983)}.app-nav li{display:inline-block;margin:0 1rem;padding:5px 0;position:relative;cursor:pointer}.app-nav li ul{background-color:#fff;border:1px solid;border-color:#ddd #ddd #ccc;border-radius:4px;box-sizing:border-box;display:none;max-height:calc(100vh - 61px);overflow-y:auto;padding:10px 0;position:absolute;right:-15px;text-align:left;top:100%;white-space:nowrap}.app-nav li ul li{display:block;font-size:14px;line-height:1rem;margin:8px 14px;white-space:nowrap}.app-nav li ul a{display:block;font-size:inherit;margin:0;padding:0}.app-nav li ul a.active{border-bottom:0}.app-nav li:hover ul{display:block}.github-corner{border-bottom:0;position:fixed;right:0;text-decoration:none;top:0;z-index:1}.github-corner:hover .octo-arm{animation:octocat-wave .56s ease-in-out}.github-corner svg{color:#fff;fill:#42b983;fill:var(--theme-color,#42b983);height:80px;width:80px}main{display:block;position:relative;width:100vw;height:100%;z-index:0}main.hidden{display:none}.anchor{display:inline-block;text-decoration:none;transition:all .3s}.anchor span{color:#34495e}.anchor:hover{text-decoration:underline}.sidebar{border-right:1px solid rgba(0,0,0,.07);overflow-y:auto;padding:40px 0 0;position:absolute;top:0;bottom:0;left:0;transition:transform .25s ease-out;width:300px;z-index:20}.sidebar>h1{margin:0 auto 1rem;font-size:1.5rem;font-weight:300;text-align:center}.sidebar>h1 a{color:inherit;text-decoration:none}.sidebar>h1 .app-nav{display:block;position:static}.sidebar .sidebar-nav{line-height:2em;padding-bottom:40px}.sidebar li.collapse .app-sub-sidebar{display:none}.sidebar ul{margin:0 0 0 15px;padding:0}.sidebar li>p{font-weight:700;margin:0}.sidebar ul,.sidebar ul li{list-style:none}.sidebar ul li a{border-bottom:none;display:block}.sidebar ul li ul{padding-left:20px}.sidebar::-webkit-scrollbar{width:4px}.sidebar::-webkit-scrollbar-thumb{background:transparent;border-radius:4px}.sidebar:hover::-webkit-scrollbar-thumb{background:hsla(0,0%,53.3%,.4)}.sidebar:hover::-webkit-scrollbar-track{background:hsla(0,0%,53.3%,.1)}.sidebar-toggle{background-color:transparent;background-color:hsla(0,0%,100%,.8);border:0;outline:none;padding:10px;position:absolute;bottom:0;left:0;text-align:center;transition:opacity .3s;width:284px;z-index:30;cursor:pointer}.sidebar-toggle:hover .sidebar-toggle-button{opacity:.4}.sidebar-toggle span{background-color:#42b983;background-color:var(--theme-color,#42b983);display:block;margin-bottom:4px;width:16px;height:2px}body.sticky .sidebar,body.sticky .sidebar-toggle{position:fixed}.content{padding-top:60px;position:absolute;top:0;right:0;bottom:0;left:300px;transition:left .25s ease}.markdown-section{margin:0 auto;max-width:80%;padding:30px 15px 40px;position:relative}.markdown-section>*{box-sizing:border-box;font-size:inherit}.markdown-section>:first-child{margin-top:0!important}.markdown-section hr{border:none;border-bottom:1px solid #eee;margin:2em 0}.markdown-section iframe{border:1px solid #eee;width:1px;min-width:100%}.markdown-section table{border-collapse:collapse;border-spacing:0;display:block;margin-bottom:1rem;overflow:auto;width:100%}.markdown-section th{font-weight:700}.markdown-section td,.markdown-section th{border:1px solid #ddd;padding:6px 13px}.markdown-section tr{border-top:1px solid #ccc}.markdown-section p.tip,.markdown-section tr:nth-child(2n){background-color:#f8f8f8}.markdown-section p.tip{border-bottom-right-radius:2px;border-left:4px solid #f66;border-top-right-radius:2px;margin:2em 0;padding:12px 24px 12px 30px;position:relative}.markdown-section p.tip:before{background-color:#f66;border-radius:100%;color:#fff;content:"!";font-family:Dosis,Source Sans Pro,Helvetica Neue,Arial,sans-serif;font-size:14px;font-weight:700;left:-12px;line-height:20px;position:absolute;height:20px;width:20px;text-align:center;top:14px}.markdown-section p.tip code{background-color:#efefef}.markdown-section p.tip em{color:#34495e}.markdown-section p.warn{background:rgba(66,185,131,.1);border-radius:2px;padding:1rem}.markdown-section ul.task-list>li{list-style-type:none}body.close .sidebar{transform:translateX(-300px)}body.close .sidebar-toggle{width:auto}body.close .content{left:0}@media print{.app-nav,.github-corner,.sidebar,.sidebar-toggle{display:none}}@media screen and (max-width:768px){.github-corner,.sidebar,.sidebar-toggle{position:fixed}.app-nav{margin-top:16px}.app-nav li ul{top:30px}main{height:auto;min-height:100vh;overflow-x:hidden}.sidebar{left:-300px;transition:transform .25s ease-out}.content{left:0;max-width:100vw;position:static;padding-top:20px;transition:transform .25s ease}.app-nav,.github-corner{transition:transform .25s ease-out}.sidebar-toggle{background-color:transparent;width:auto;padding:30px 30px 10px 10px}body.close .sidebar{transform:translateX(300px)}body.close .sidebar-toggle{background-color:hsla(0,0%,100%,.8);transition:background-color 1s;width:284px;padding:10px}body.close .content{transform:translateX(300px)}body.close .app-nav,body.close .github-corner{display:none}.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave .56s ease-in-out}}@keyframes octocat-wave{0%,to{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}section.cover{position:relative;align-items:center;background-position:50%;background-repeat:no-repeat;background-size:cover;min-height:100vh;width:100%;display:none}section.cover.show{display:flex}section.cover.has-mask .mask{background-color:#fff;opacity:.8;position:absolute;top:0;bottom:0;width:100%}section.cover .cover-main{flex:1;margin:0 16px;text-align:center;position:relative}section.cover a{color:inherit}section.cover a,section.cover a:hover{text-decoration:none}section.cover p{line-height:1.5rem;margin:1em 0}section.cover h1{color:inherit;font-size:2.5rem;font-weight:300;margin:.625rem 0 2.5rem;position:relative;text-align:center}section.cover h1 a{display:block}section.cover h1 small{bottom:-.4375rem;font-size:1rem;position:absolute}section.cover blockquote{font-size:1.5rem;text-align:center}section.cover ul{line-height:1.8;list-style-type:none;margin:1em auto;max-width:500px;padding:0}section.cover .cover-main>p:last-child a{border-radius:2rem;border:1px solid #42b983;border-color:var(--theme-color,#42b983);box-sizing:border-box;color:#42b983;color:var(--theme-color,#42b983);display:inline-block;font-size:1.05rem;letter-spacing:.1rem;margin:.5rem 1rem;padding:.75em 2rem;text-decoration:none;transition:all .15s ease}section.cover .cover-main>p:last-child a:last-child{background-color:#42b983;background-color:var(--theme-color,#42b983);color:#fff}section.cover .cover-main>p:last-child a:last-child:hover{color:inherit;opacity:.8}section.cover .cover-main>p:last-child a:hover{color:inherit}section.cover blockquote>p>a{border-bottom:2px solid #42b983;border-bottom:2px solid var(--theme-color,#42b983);transition:color .3s}section.cover blockquote>p>a:hover{color:#42b983;color:var(--theme-color,#42b983)}.sidebar,body{background-color:#fff}.sidebar{color:#364149}.sidebar li{margin:6px 0}.sidebar ul li a{color:#505d6b;font-size:14px;font-weight:400;overflow:hidden;text-decoration:none;text-overflow:ellipsis;white-space:nowrap}.sidebar ul li a:hover{text-decoration:underline}.sidebar ul li ul{padding:0}.sidebar ul li.active>a{border-right:2px solid;color:#42b983;color:var(--theme-color,#42b983);font-weight:600}.app-sub-sidebar li:before{content:"-";padding-right:4px;float:left}.markdown-section h1,.markdown-section h2,.markdown-section h3,.markdown-section h4,.markdown-section strong{color:#2c3e50;font-weight:600}.markdown-section a{color:#42b983;color:var(--theme-color,#42b983);font-weight:600}.markdown-section h1{font-size:2rem;margin:0 0 1rem}.markdown-section h2{font-size:1.75rem;margin:45px 0 .8rem}.markdown-section h3{font-size:1.5rem;margin:40px 0 .6rem}.markdown-section h4{font-size:1.25rem}.markdown-section h5{font-size:1rem}.markdown-section h6{color:#777;font-size:1rem}.markdown-section figure,.markdown-section p{margin:1.2em 0}.markdown-section ol,.markdown-section p,.markdown-section ul{line-height:1.6rem;word-spacing:.05rem}.markdown-section ol,.markdown-section ul{padding-left:1.5rem}.markdown-section blockquote{border-left:4px solid #42b983;border-left:4px solid var(--theme-color,#42b983);color:#858585;margin:2em 0;padding-left:20px}.markdown-section blockquote p{font-weight:600;margin-left:0}.markdown-section iframe{margin:1em 0}.markdown-section em{color:#7f8c8d}.markdown-section code,.markdown-section output:after,.markdown-section pre{font-family:Roboto Mono,Monaco,courier,monospace}.markdown-section code,.markdown-section pre{background-color:#f8f8f8}.markdown-section output,.markdown-section pre{margin:1.2em 0;position:relative}.markdown-section output,.markdown-section pre>code{border-radius:2px;display:block}.markdown-section output:after,.markdown-section pre>code{-moz-osx-font-smoothing:initial;-webkit-font-smoothing:initial}.markdown-section code{border-radius:2px;color:#e96900;margin:0 2px;padding:3px 5px;white-space:pre-wrap}.markdown-section>:not(h1):not(h2):not(h3):not(h4):not(h5):not(h6) code{font-size:.8rem}.markdown-section pre{padding:0 1.4rem;line-height:1.5rem;overflow:auto;word-wrap:normal}.markdown-section pre>code{color:#525252;font-size:.8rem;padding:2.2em 5px;line-height:inherit;margin:0 2px;max-width:inherit;overflow:inherit;white-space:inherit}.markdown-section output{padding:1.7rem 1.4rem;border:1px dotted #ccc}.markdown-section output>:first-child{margin-top:0}.markdown-section output>:last-child{margin-bottom:0}.markdown-section code:after,.markdown-section code:before,.markdown-section output:after,.markdown-section output:before{letter-spacing:.05rem}.markdown-section output:after,.markdown-section pre:after{color:#ccc;font-size:.6rem;font-weight:600;height:15px;line-height:15px;padding:5px 10px 0;position:absolute;right:0;text-align:right;top:0;content:attr(data-lang)}.token.cdata,.token.comment,.token.doctype,.token.prolog{color:#8e908c}.token.namespace{opacity:.7}.token.boolean,.token.number{color:#c76b29}.token.punctuation{color:#525252}.token.property{color:#c08b30}.token.tag{color:#2973b7}.token.string{color:#42b983;color:var(--theme-color,#42b983)}.token.selector{color:#6679cc}.token.attr-name{color:#2973b7}.language-css .token.string,.style .token.string,.token.entity,.token.url{color:#22a2c9}.token.attr-value,.token.control,.token.directive,.token.unit{color:#42b983;color:var(--theme-color,#42b983)}.token.function,.token.keyword{color:#e96900}.token.atrule,.token.regex,.token.statement{color:#22a2c9}.token.placeholder,.token.variable{color:#3d8fd1}.token.deleted{text-decoration:line-through}.token.inserted{border-bottom:1px dotted #202746;text-decoration:none}.token.italic{font-style:italic}.token.bold,.token.important{font-weight:700}.token.important{color:#c94922}.token.entity{cursor:help}code .token{-moz-osx-font-smoothing:initial;-webkit-font-smoothing:initial;min-height:1.5rem;position:relative;left:auto}
:root { --theme-color: #2a7a5a; }
body, .sidebar, .sidebar-toggle { background: #f3f2ee; }
/* 载入提示：vue.css 的 div#app { margin: 40vh auto } 会穿透到 body，载入完成时整页从屏幕中间跳到顶部 */
div#app { display: flex; align-items: center; justify-content: center; min-height: 100vh; margin: 0; color: #5f6d66; font-size: 14px; letter-spacing: .04em; }
/* 载入完成前 body 不能滚动，出现滚动条时页面会左移；预留滚动条的位置 */
html { scrollbar-gutter: stable; }
body { color: #34495e; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; }
.app-name { font-weight: 650 !important; letter-spacing: .02em; }
.sidebar { padding-top: 24px; border-right: 1px solid #e2e3dc; }
.sidebar .search { border-bottom: 1px solid #e2e3dc; margin-bottom: 20px; }
.search input { background: #fff !important; border-radius: 6px; }
.sidebar-nav > ul { padding-left: 18px; }
.sidebar ul li { margin: 7px 0; }
.sidebar ul li strong { font-size: 13px; letter-spacing: .08em; color: #5f6d66; }
.sidebar ul li a { font-size: 14px; }
.markdown-section { max-width: 960px; padding: 36px 48px 100px; }
.markdown-section h1 { margin: 1rem 0 2rem; font-size: 2rem; }
.markdown-section h2 { margin: 2.8rem 0 1.2rem; padding-bottom: .45rem; border-bottom: 1px solid #dfe3da; }
.markdown-section h3 { margin-top: 2rem; }
.markdown-section p, .markdown-section ul, .markdown-section ol { line-height: 1.95; }
.markdown-section img { max-width: 100%; height: auto; border-radius: 4px; }
.markdown-section pre { background: #fafbf8; border-radius: 6px; border: 1px solid #e2e6dc; }
.markdown-section pre > code { font-family: "SFMono-Regular", Consolas, monospace; line-height: 1.65; }
.markdown-section table { display: block; overflow: auto; }
.markdown-section tr:nth-child(2n) { background: #f8f9f5; }
.markdown-section td, .markdown-section th { border-color: #dfe3da; }
.docsify-copy-code-button { font-family: inherit !important; }
.search .matching-post { border-color: #dde3d8; }
.site-footer { border-top: 1px solid #dfe3da; margin-top: 64px; padding-top: 20px; color: #7c877d; font-size: 12px; text-align: center; }
.site-footer a { color: inherit; font-weight: 400; }
.topic-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; margin: 18px 0; }
.topic-grid a { display: flex; align-items: center; justify-content: center; gap: 7px; padding: 13px 8px; border: 1px solid #dfe3da; border-radius: 7px; background: #fafbf8; text-decoration: none; font-size: 14px; white-space: nowrap; }
.topic-grid a:hover, .topic-grid a:focus-visible { background: #e8f1e9; border-color: #2a7a5a; }
.site-search { padding: 8px 15px; }
.site-search input { box-sizing: border-box; width: 100%; min-height: 42px; padding: 10px; border: 1px solid #dfe3da; color: #34495e; font-size: 15px; }
.site-search input:focus { outline: 2px solid #2a7a5a; outline-offset: 1px; }
.search-status { color: #5f6d66; font-size: 12px; margin: 7px 0; }
.search-status:empty { display: none; }
.site-search .matching-post { display: block; padding: 12px 0; border-bottom: 1px solid #dde3d8; text-decoration: none; }
.matching-post strong, .matching-post small { display: block; }
.matching-post strong { color: #2a7a5a; font-size: 14px; }
.matching-post small { color: #5f6d66; margin: 5px 0; font-size: 12px; }
.matching-post p { color: #34495e; margin: 4px 0; font-size: 13px; line-height: 1.7; overflow-wrap: anywhere; }
.article-toc { border: 1px solid #dfe3da; border-radius: 7px; padding: 12px 18px; margin: 20px 0 28px; background: #fafbf8; }
.article-toc summary { color: #2a7a5a; font-weight: 600; cursor: pointer; min-height: 24px; }
.article-toc > ul { margin-bottom: 0; }
.learn-banner, .learn-callout { display: flex; align-items: center; gap: 16px; margin: 18px 0; padding: 16px 18px; border: 1px solid #e3e6e4; border-left: 4px solid var(--theme-color); border-radius: 10px; background: #fafbfa; color: inherit; text-decoration: none !important; }
.learn-banner:hover, .learn-banner:focus-visible, .learn-callout:hover, .learn-callout:focus-visible { border-color: var(--theme-color); background: #eef7f2; }
.learn-banner-text { flex: 1; min-width: 0; }
.learn-banner b, .learn-callout b { display: block; color: var(--theme-color); font-size: 16px; }
.learn-banner-text span, .learn-callout span { display: block; margin-top: 2px; font-size: 14px; line-height: 1.6; color: #34495e; }
.learn-banner-go { flex: none; padding: 7px 18px; border-radius: 8px; background: var(--theme-color); color: #fff; font-weight: 600; font-size: 15px; }
.learn-callout { display: block; }
.learn-practice { margin-top: 36px; }
.learn-q { display: flex; align-items: center; gap: 8px; margin: -6px 0 16px; padding: 7px 12px; border: 1px solid #e3e6e4; border-radius: 8px; background: #fafbfa; color: inherit; font-size: 14px; line-height: 1.5; text-decoration: none !important; }
.learn-q:hover, .learn-q:focus-visible { border-color: var(--theme-color); background: #eef7f2; }
.learn-q-label { flex: none; padding: 1px 7px; border-radius: 5px; background: #e3f2ea; color: var(--theme-color); font-size: 12px; font-weight: 600; }
.learn-q-text { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: #34495e; }
.learn-q-go { flex: none; color: var(--theme-color); font-weight: 600; }
.learn-daily { margin: -8px 0 18px; }
.learn-daily .learn-q-text { display: -webkit-box; white-space: normal; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.learn-q.due .learn-q-go { color: #c2410c; }
@media (min-width: 769px) { .content { padding-top: 12px; } .article-toc { display: none; } }
.page-toc-block { margin: 0 0 18px; padding: 0 0 14px 18px; border-bottom: 1px solid #e2e3dc; }
.page-toc-title { margin: 0 0 6px; font-size: 14px; font-weight: 600; color: #34495e; }
.sidebar ul.page-toc { margin: 6px 0 4px 10px; padding-left: 8px; border-left: 1px solid #dfe3da; }
.sidebar ul.page-toc li { margin: 4px 0; }
.sidebar ul.page-toc li a { font-size: 13px; color: #5a6560; border: none; font-weight: normal; }
.sidebar ul.page-toc ul { margin: 2px 0 2px 12px; }
.sidebar ul.page-toc li.has-sub > ul { display: none; }
.sidebar ul.page-toc li.has-sub.open > ul { display: block; }
.sidebar ul.page-toc li.current > a { color: var(--theme-color); font-weight: 600; }
@media (max-width: 768px) {
  .markdown-section { padding: 24px 22px 80px; }
  .markdown-section h1 { font-size: 1.65rem; }
  .markdown-section pre { padding: 14px; }
  .topic-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .topic-grid a { min-height: 44px; padding: 8px; }
  .site-logo { width: 110px; }
  .sidebar-toggle { width: 48px; height: 48px; padding: 13px; background: rgba(243, 242, 238, .95); }
  .sidebar ul li a { min-height: 28px; line-height: 2; }
  .article-toc summary { min-height: 32px; line-height: 2; }
}

/* 高频小节：目录、侧边栏和正文标题后的小火焰 */
.hot { display: inline-flex; gap: 1px; margin-left: 5px; line-height: 1; vertical-align: -1px; }
.hot svg { display: block; width: 11px; height: 14px; }
.hot .o { fill: #d2665c; }
.hot .i { fill: #f6d7d2; }
.markdown-section h2 .hot, .markdown-section h3 .hot, .markdown-section h4 .hot { margin-left: 8px; vertical-align: 1px; }
.markdown-section h2 .hot svg, .markdown-section h3 .hot svg { width: 15px; height: 19px; }
.markdown-section h4 .hot svg { width: 13px; height: 16px; }

/* 步骤动图的播放器 */
.anim-bar { display: flex; justify-content: center; align-items: center; gap: 8px; margin: 6px 0 4px; }
.anim-bar button { min-height: 30px; padding: 2px 12px; border: 1px solid #dfe3da; border-radius: 6px; background: #fafbf8; color: #34495e; font: inherit; font-size: 13px; cursor: pointer; }
.anim-bar button:hover, .anim-bar button:focus-visible { border-color: #2a7a5a; color: #2a7a5a; }
.anim-count { min-width: 44px; color: #5f6d66; font-size: 12px; font-variant-numeric: tabular-nums; }

/* 代码高亮：在 #f8f8f8 底上对比度不低于 4.5:1 */
.markdown-section code { color: #9a3f2a; }
.token.comment, .token.prolog, .token.doctype, .token.cdata { color: #646e69; }
.token.keyword, .token.function { color: #a3501b; }
.token.string, .token.attr-value { color: #2a7a52; }
.token.number, .token.boolean { color: #9b5a14; }
.token.namespace { opacity: 1; color: #58635d; }
.token.tag, .token.attr-name, .token.variable, .token.placeholder { color: #2d6b9a; }
.token.important { color: #a8401c; }
.token.entity, .token.control, .token.directive, .token.unit { color: #17788a; }
.token.selector { color: #5a52a3; }
.token.property { color: #7f6212; }
.token.atrule, .token.regex, .token.statement, .token.url { color: #17788a; }
.learn-q-label { background: #e7f1eb; }
/* 首页贡献者头像：链接按图片大小计算点击区域 */
.markdown-section > a:has(> img) { display: inline-block; margin: 2px; }
.markdown-section > a > img[src*="avatars"] { aspect-ratio: 1; }

/* 离线提示 */
.markdown-section .offline-note { margin: 0 0 18px; padding: 8px 12px; border-radius: 6px; background: #eaf3ee; color: #34495e; font-size: 14px; }

/* 键盘操作：焦点清晰可见；第一个可聚焦的是“跳到正文”，不用先按过侧边栏的上百个链接 */
:focus-visible { outline: 2px solid var(--theme-color); outline-offset: 2px; border-radius: 3px; }
.sidebar-toggle:focus-visible { outline: 2px solid var(--theme-color); outline-offset: -2px; }
.skip-link { position: fixed; left: 12px; top: -48px; z-index: 50; padding: 8px 14px; border: 0; border-radius: 6px; background: var(--theme-color); color: #fff; font: inherit; font-size: 14px; cursor: pointer; }
.skip-link:focus { top: 12px; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; } }

/* 打印：只保留正文，占满纸张宽度 */
@media print {
  .sidebar, .sidebar-toggle, .github-corner, .anim-bar, .docsify-copy-code-button, .site-footer, .skip-link { display: none !important; }
  .content { position: static; left: 0 !important; padding: 0; }
  .markdown-section { max-width: none; padding: 0; }
  .markdown-section pre, .markdown-section img { break-inside: avoid; }
  .article-toc { display: none; }
}

/* 打印：去掉学习站的入口和题目提示，代码自动换行不被截断，标题不落在页尾 */
@media print {
  body, .markdown-section pre, .markdown-section code { background: #fff !important; }
  .learn-q, .learn-callout, .learn-banner, .offline-note { display: none !important; }
  .markdown-section pre, .markdown-section pre > code { white-space: pre-wrap !important; overflow-wrap: anywhere; }
  .markdown-section h1, .markdown-section h2, .markdown-section h3, .markdown-section h4 { break-after: avoid; }
  .markdown-section table { display: table; }
  .markdown-section tr { break-inside: avoid; }
}
.markdown-section pre > code[tabindex]:focus-visible, .markdown-section table[tabindex]:focus-visible { outline: 2px solid currentColor; outline-offset: -2px; }