:root {
  --bg: #ffffff;
  --fg: #1c1e21;
  --muted: #6b7280;
  --border: #e6e8eb;
  --border-strong: #d3d7dd;
  --accent: #4f46e5;
  --accent-soft: #eef2ff;
  --code-bg: #f6f8fa;
  --sidebar-w: 272px;
  --toc-w: 220px;
  --header-h: 56px;
  --maxw: 1400px;
  --content-maxw: 780px;
  --radius: 8px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--sans);
  color: var(--fg);
  background: var(--bg);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Top bar */
.dx-header {
  position: sticky; top: 0; z-index: 30;
  height: var(--header-h);
  display: flex; align-items: center; gap: 20px;
  padding: 0 20px;
  background: rgba(255,255,255,.9);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.dx-brand { display: flex; align-items: center; gap: 10px; font-weight: 600; }
.dx-brand img { height: 20px; display: block; }
.dx-brand .tag { color: var(--muted); font-weight: 500; font-size: 13px; }
.dx-search {
  flex: 1; max-width: 420px; margin-left: auto;
}
.dx-search input {
  width: 100%; padding: 7px 12px; font-size: 14px;
  border: 1px solid var(--border-strong); border-radius: 20px;
  background: #fafbfc; color: var(--fg); outline: none;
}
.dx-search input:focus { border-color: var(--accent); background: #fff; }
.dx-header .links { display: flex; gap: 16px; font-size: 14px; color: var(--muted); }

/* Layout */
.dx-layout {
  max-width: var(--maxw); margin: 0 auto;
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0,1fr) var(--toc-w);
  gap: 0;
  align-items: start;
}

/* Sidebar */
.dx-sidebar {
  position: sticky; top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  padding: 24px 16px 64px 20px;
  border-right: 1px solid var(--border);
}
.dx-sidebar .group { margin-bottom: 22px; }
.dx-sidebar .group > .label {
  font-size: 11px; text-transform: uppercase; letter-spacing: .06em;
  color: var(--muted); font-weight: 600; margin: 0 0 8px 8px;
}
.dx-sidebar a {
  display: block; padding: 5px 8px; margin: 1px 0;
  border-radius: 6px; color: var(--fg); font-size: 14px;
}
.dx-sidebar a:hover { background: #f3f4f6; text-decoration: none; }
.dx-sidebar a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.dx-sidebar .empty { color: var(--muted); font-size: 13px; padding: 8px; }

/* Content */
.dx-main { min-width: 0; padding: 32px 40px 96px; }
.dx-toolbar {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin-bottom: 8px;
}
.dx-toolbar .spacer { flex: 1; }
.dx-btn {
  font-size: 12px; padding: 4px 10px; border: 1px solid var(--border-strong);
  border-radius: 6px; background: #fff; color: var(--fg); cursor: pointer;
  text-decoration: none; display: inline-flex; align-items: center; gap: 5px;
}
.dx-btn:hover { background: #f3f4f6; text-decoration: none; }
.dx-breadcrumb { font-size: 13px; color: var(--muted); }

.dx-doc { max-width: var(--content-maxw); }
.dx-doc h1 { font-size: 30px; line-height: 1.2; margin: 6px 0 18px; }
.dx-doc h2 { font-size: 21px; margin: 36px 0 12px; padding-bottom: 6px; border-bottom: 1px solid var(--border); scroll-margin-top: 72px; }
.dx-doc h3 { font-size: 17px; margin: 26px 0 8px; scroll-margin-top: 72px; }
.dx-doc h4 { font-size: 15px; margin: 20px 0 6px; }
.dx-doc p { margin: 12px 0; }
.dx-doc ul, .dx-doc ol { padding-left: 1.4em; margin: 12px 0; }
.dx-doc li { margin: 4px 0; }
.dx-doc ul.contains-task-list { list-style: none; padding-left: .4em; }
.dx-doc li input[type=checkbox] { margin-right: 8px; }
.dx-doc a { text-decoration: underline; text-underline-offset: 2px; }
.dx-doc table { border-collapse: collapse; width: 100%; margin: 18px 0; font-size: 14px; display: block; overflow-x: auto; }
.dx-doc th, .dx-doc td { border: 1px solid var(--border-strong); padding: 8px 12px; text-align: left; vertical-align: top; }
.dx-doc th { background: var(--code-bg); font-weight: 600; }
.dx-doc pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius); overflow-x: auto; margin: 16px 0; }
.dx-doc pre code.hljs { padding: 14px 16px; background: transparent; font-size: 13px; }
.dx-doc :not(pre) > code { background: var(--code-bg); border: 1px solid var(--border); padding: 1px 5px; border-radius: 5px; font-size: 13px; font-family: var(--mono); }
.dx-doc blockquote { border-left: 3px solid var(--accent); background: var(--accent-soft); margin: 16px 0; padding: 8px 16px; border-radius: 0 6px 6px 0; }
.dx-doc blockquote p { margin: 4px 0; }
.dx-doc img { max-width: 100%; }
.dx-doc hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }
.dx-updated { margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--border); font-size: 13px; color: var(--muted); }

/* Right TOC */
.dx-toc {
  position: sticky; top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto; padding: 32px 20px 64px 8px;
  font-size: 13px;
}
.dx-toc .label { text-transform: uppercase; letter-spacing: .06em; font-size: 11px; color: var(--muted); font-weight: 600; margin-bottom: 10px; }
.dx-toc a { display: block; color: var(--muted); padding: 3px 0; border-left: 2px solid transparent; padding-left: 10px; }
.dx-toc a.h3 { padding-left: 22px; }
.dx-toc a:hover { color: var(--fg); text-decoration: none; }
.dx-toc a.active { color: var(--accent); border-left-color: var(--accent); }

/* Responsive */
@media (max-width: 1100px) { .dx-toc { display: none; } .dx-layout { grid-template-columns: var(--sidebar-w) minmax(0,1fr); } }
@media (max-width: 760px) {
  .dx-sidebar { display: none; }
  .dx-layout { grid-template-columns: 1fr; }
  .dx-main { padding: 24px 18px 80px; }
  .dx-search { display: none; }
}

/* ---------- Dark theme ---------- */
[data-theme="dark"] {
  --bg: #0d1117;
  --fg: #e6edf3;
  --muted: #8b949e;
  --border: #21262d;
  --border-strong: #30363d;
  --accent: #7c8cff;
  --accent-soft: #182031;
  --code-bg: #161b22;
}
[data-theme="dark"] .dx-header { background: rgba(13,17,23,.85); }
[data-theme="dark"] .dx-search input { background: #161b22; }
[data-theme="dark"] .dx-btn, [data-theme="dark"] .dx-menu { background: #161b22; }
[data-theme="dark"] .dx-sidebar a:hover { background: #161b22; }

/* Adaptive inline logo (uses currentColor + --bg so it flips with theme) */
.dx-brand { color: var(--fg); }
.dx-brand svg { height: 22px; width: auto; display: block; }

/* Header controls */
.dx-ctl {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 30px; border: 1px solid var(--border-strong);
  border-radius: 6px; background: var(--bg); color: var(--fg); cursor: pointer;
  font-size: 13px;
}
.dx-ctl:hover { background: var(--code-bg); }
.dx-lang { min-width: 42px; font-weight: 600; }

/* AI tools dropdown */
.dx-dd { position: relative; }
.dx-menu {
  position: absolute; right: 0; top: 36px; z-index: 40; min-width: 220px;
  background: var(--bg); border: 1px solid var(--border-strong); border-radius: 8px;
  box-shadow: 0 8px 28px rgba(0,0,0,.14); padding: 6px; display: none;
}
.dx-menu.open { display: block; }
.dx-menu button, .dx-menu a {
  display: block; width: 100%; text-align: left; background: none; border: none;
  color: var(--fg); font-size: 13px; padding: 8px 10px; border-radius: 6px; cursor: pointer;
  text-decoration: none;
}
.dx-menu button:hover, .dx-menu a:hover { background: var(--code-bg); text-decoration: none; }
.dx-menu .sep { height: 1px; background: var(--border); margin: 5px 4px; }
.dx-menu .mlabel { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); padding: 6px 10px 2px; }
.dx-header .head-right { display: flex; align-items: center; gap: 8px; }

/* Inline SVG figures: inherit theme text color so currentColor flips with theme */
.dx-doc svg.dx-figure { display: block; max-width: 100%; height: auto; margin: 18px 0; color: var(--fg); }