:root { color-scheme: dark; --bg:#1c2128; --surface:#222930; --ink:#e3e9f1; --muted:#a7b4c3; --accent:#59c3ff; --line:#394653; font-family:"IBM Plex Sans","PingFang SC","Microsoft YaHei",sans-serif; background:var(--bg); color:var(--ink); }
* { box-sizing:border-box; }
html { scroll-padding-top:90px; }
body { margin:0; font-size:15px; line-height:1.8; padding-bottom:34px; }
a { color:var(--accent); text-decoration:none; }
a:hover { text-decoration:underline; text-underline-offset:4px; }
a:focus-visible,button:focus-visible { outline:2px solid var(--accent); outline-offset:4px; }
.reader-header { height:64px; padding:0 36px; display:flex; justify-content:space-between; align-items:center; border-bottom:1px solid var(--line); background:var(--bg); position:sticky; top:0; z-index:10; }
.reader-brand { display:flex; gap:12px; align-items:center; color:var(--ink); font-size:16px; letter-spacing:.03em; white-space:nowrap; }
.reader-brand span { color:var(--muted); font-size:12px; }
.editor-link { border:1px solid var(--line); border-radius:5px; padding:5px 12px; font-size:12px; white-space:nowrap; }
.editor-link span { margin-left:12px; }
.reader-layout { display:grid; grid-template-columns:220px minmax(0,800px); gap:64px; max-width:1200px; padding:40px 36px 72px; margin:auto; }
.reader-sidebar { position:sticky; top:104px; height:calc(100vh - 150px); overflow:auto; scrollbar-width:thin; padding-right:14px; }
.nav-label { font-size:10px; font-weight:600; letter-spacing:.12em; color:var(--muted); margin:8px 0 14px; }
.reader-sidebar nav { display:grid; margin-bottom:32px; gap:4px; }
.reader-sidebar nav a { color:var(--muted); font-size:13px; padding:5px 12px; border-left:1px solid var(--line); }
.reader-sidebar a[aria-current] { border-left:2px solid var(--accent); background:#59c3ff0d; color:var(--accent); }
.reader-toc a:hover { color:var(--ink); }
.sidebar-note { color:var(--muted); font-size:11px; line-height:2; margin-top:36px; }
main { min-width:0; }
.reader-breadcrumb { display:flex; flex-wrap:wrap; gap:12px; font-size:11px; color:var(--muted); }
.reader-breadcrumb a { color:var(--muted); }
.chapter-label { color:var(--accent); font-size:11px; letter-spacing:.16em; margin:40px 0 8px; }
.tutorial-body h1 { font-size:clamp(30px,4vw,46px); font-weight:600; letter-spacing:-.04em; line-height:1.3; margin:0 0 26px; }
.tutorial-body h1 + p { font-size:16px; color:var(--muted); line-height:1.9; padding-bottom:24px; border-bottom:1px solid var(--line); }
.tutorial-body h2 { font-size:23px; font-weight:500; margin:48px 0 16px; letter-spacing:-.02em; }
.tutorial-body h3 { font-size:17px; margin:30px 0 12px; font-weight:500; }
.tutorial-body p { margin:14px 0; overflow-wrap:anywhere; }
.tutorial-body li { margin:5px 0; }
.tutorial-body code { font-family:"IBM Plex Mono",Consolas,monospace; font-size:.87em; background:#59c3ff0a; color:#abdfff; padding:2px 5px; border-radius:3px; overflow-wrap:anywhere; }
.tutorial-body figure { margin:20px 0; min-width:0; }
.code-block { border:1px solid var(--line); border-radius:6px; background:#181e25; overflow:hidden; }
.code-block figcaption { display:flex; align-items:center; justify-content:space-between; padding:6px 14px; border-bottom:1px solid var(--line); color:var(--muted); font:11px/1.8 Consolas,monospace; }
.copy-code { display:none; border:0; background:transparent; color:var(--muted); cursor:pointer; font:inherit; }
.has-js .copy-code { display:inline-block; }
pre { margin:0; padding:18px; overflow:auto; max-width:100%; font-size:13px; line-height:1.75; tab-size:2; }
.tutorial-body pre code { padding:0; background:none; color:var(--ink); white-space:pre; overflow-wrap:normal; }
.hljs-keyword,.hljs-selector-tag { color:#ce9dff; }.hljs-string,.hljs-attr { color:#aad5a0; }.hljs-number,.hljs-literal { color:#f4b877; }.hljs-comment { color:#8795a5; }.hljs-title { color:#75cbff; }
blockquote { border-left:3px solid var(--accent); margin:20px 0; padding:4px 20px; background:var(--surface); color:var(--muted); }
.tutorial-body table { display:block; width:100%; overflow:auto; border-collapse:collapse; margin:22px 0; font-size:14px; }
th,td { padding:10px 15px; border:1px solid var(--line); text-align:left; }
th { background:var(--surface); font-weight:500; }
.mermaid-block { border:1px solid var(--line); border-radius:6px; padding:20px; background:var(--surface); overflow:auto; }
.mermaid-canvas svg { display:block; max-width:100%; height:auto; margin:auto; }
.katex-display { overflow-x:auto; overflow-y:hidden; padding:12px 0; }
hr { border:0; border-top:1px solid var(--line); margin:32px 0; }
.footnotes { font-size:13px; color:var(--muted); }
.next-chapter { display:flex; flex-wrap:wrap; justify-content:space-between; gap:16px; margin-top:48px; border-top:1px solid var(--line); padding-top:24px; font-size:13px; }
.reader-status { position:fixed; bottom:0; width:100%; height:30px; display:grid; grid-template-columns:minmax(0,1fr) auto minmax(0,1fr); align-items:center; padding:0 24px; background:var(--bg); border-top:1px solid var(--line); color:var(--muted); font-size:10px; gap:8px; z-index:10; }
.reader-status a { color:var(--muted); }.reader-copyright { opacity:.65; justify-self:center; }.reader-status > a:last-child { justify-self:end; }.reader-copyright:hover { opacity:1; }
.skip-link { position:fixed; left:12px; top:-100px; z-index:20; padding:8px 16px; background:var(--surface); }.skip-link:focus { top:8px; }
@media(max-width:850px) { .reader-layout { gap:30px; grid-template-columns:170px minmax(0,1fr); padding-inline:24px; } .reader-header { padding-inline:24px; } }
@media(max-width:600px) { .reader-header { height:56px; padding-inline:16px; gap:12px; }.reader-brand { gap:8px; font-size:14px; }.reader-brand span { display:none; }.editor-link { font-size:11px; padding:4px 8px; }.editor-link span { margin-left:4px; }.reader-layout { display:block; padding:20px 18px 48px; }.reader-sidebar { position:static; height:auto; padding:0; }.reader-sidebar nav:first-of-type { display:flex; margin:0 0 22px; }.reader-sidebar .nav-label,.reader-toc,.sidebar-note { display:none; }.reader-sidebar nav.reader-toc { display:none; }.chapter-label { margin-top:28px; }.tutorial-body h1 + p { font-size:14px; }.tutorial-body h2 { font-size:21px; }.reader-status { padding-inline:10px; }.mermaid-block { padding:10px; } }
@media(prefers-reduced-motion:reduce) { html { scroll-behavior:auto; } }
.reader-language { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; }
.reader-language-fallback { display: inline-flex; align-items: center; gap: 6px; }
.reader-language.is-enhanced .reader-language-fallback { display: none; }
.reader-language .language-trigger { display: none; }
.reader-language.is-enhanced .language-trigger { display: grid; }
.reader-language .language-trigger {
  place-items: center; width: 26px; height: 26px; padding: 0; flex-shrink: 0;
  border: 0; border-radius: 4px; background: transparent; color: #8e99a5; cursor: pointer;
}
.reader-language .language-trigger:hover,
.reader-language .language-trigger[aria-expanded="true"] { color: #6c9dff; background: #17366c; }
.reader-language .language-trigger:focus-visible { outline: 2px solid #6c9dff; outline-offset: -4px; border-radius: 6px; }
.reader-language .language-menu {
  position: fixed; z-index: 100; width: 180px; padding: 6px;
  border: 1px solid #2b333c; border-radius: 8px; background: #171c22; color: #f5f7f8;
  box-shadow: 0 8px 28px #0003, 0 2px 6px #0002; font: 13px/1.4 system-ui, sans-serif;
}
.reader-language .language-menu-heading { padding: 5px 10px 7px; color: #626d79; font-size: 11px; }
.reader-language .language-menu button {
  display: flex; align-items: center; justify-content: space-between; width: 100%; min-height: 36px;
  padding: 8px 10px; border: 0; border-radius: 4px; background: transparent; color: inherit; font: inherit; cursor: pointer;
}
.reader-language .language-menu button[aria-checked="true"] { color: #6c9dff; }
.reader-language .language-menu button:not([aria-checked="true"]) svg { visibility: hidden; }
.reader-language .language-menu button:hover,
.reader-language .language-menu button:focus-visible { background: #17366c; outline: none; }
.reader-language select { background: #222930; color: #e3e9f1; border: 1px solid #455361; border-radius: 5px; padding: 6px; font: inherit; }
.reader-language select:focus-visible { outline: 2px solid #59c3ff; outline-offset: 2px; }
@media (max-width: 640px) { .reader-header { flex-wrap: wrap; gap: 10px; height: auto; padding-top: 12px; padding-bottom: 12px; } .reader-language > span { display: none; } }