: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: #718078; 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: #718078; }
.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: #718078; 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: #718078; 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: #718078; 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; }
}