/* ----- Tokens ---------------------------------------------------------- */
:root {
  --bg: #ffffff;
  --bg-elev: #fafbfc;
  --bg-sunken: #f4f6f8;
  --fg: #1c2024;
  --fg-muted: #5b6770;
  --fg-subtle: #8590a0;
  --border: #e4e7eb;
  --border-strong: #cdd2d8;
  --accent: #2962ff;
  --accent-fg: #ffffff;
  --accent-soft: rgba(41, 98, 255, 0.10);
  --accent-softer: rgba(41, 98, 255, 0.05);
  --success: #1f8f4f;
  --warning: #c47800;
  --danger: #d1242f;
  --code-bg: #f6f8fa;
  --code-fg: #24292e;
  --kbd-bg: #fafbfc;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --sidebar-w: 272px;
  --topbar-h: 56px;
  --content-max: 860px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

@supports (font-variation-settings: normal) {
  :root { --font-sans: "Inter var", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --bg-elev: #151a21;
    --bg-sunken: #0a0d12;
    --fg: #e6edf3;
    --fg-muted: #9ba6b3;
    --fg-subtle: #6b7785;
    --border: #232a33;
    --border-strong: #303843;
    --accent: #69a1ff;
    --accent-fg: #0e1116;
    --accent-soft: rgba(105, 161, 255, 0.14);
    --accent-softer: rgba(105, 161, 255, 0.06);
    --code-bg: #161b22;
    --code-fg: #e6edf3;
    --kbd-bg: #1c2128;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 6px 18px rgba(0, 0, 0, 0.4);
  }
}

/* ----- Base ------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--topbar-h) + 12px); }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

::selection { background: var(--accent-soft); color: var(--fg); }

/* ----- Top bar --------------------------------------------------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
@media (prefers-color-scheme: dark) {
  .topbar { background: rgba(14, 17, 22, 0.85); }
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
  color: var(--fg);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #1543c2);
  color: var(--accent-fg);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: var(--shadow-sm);
}

.source-link {
  font-size: 13px;
  color: var(--fg-muted);
}
.source-link:hover { color: var(--accent); text-decoration: none; }

/* ----- Layout ---------------------------------------------------------- */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: calc(100vh - var(--topbar-h));
}

/* ----- Sidebar --------------------------------------------------------- */
.sidebar {
  border-right: 1px solid var(--border);
  background: var(--bg-elev);
  height: calc(100vh - var(--topbar-h));
  position: sticky;
  top: var(--topbar-h);
  overflow-y: auto;
  overscroll-behavior: contain;
}
.sidebar-inner { padding: 20px 14px 40px; }

.group + .group { margin-top: 22px; }
.group-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-subtle);
  padding: 0 10px 8px;
}

.sidebar ul { list-style: none; padding: 0; margin: 0; }
.sidebar li { margin: 1px 0; }
.sidebar li a {
  display: block;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  color: var(--fg-muted);
  font-size: 13.5px;
  line-height: 1.45;
  transition: background-color 80ms ease, color 80ms ease;
}
.sidebar li a:hover {
  background: var(--accent-softer);
  color: var(--fg);
  text-decoration: none;
}
.sidebar li.active a {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

/* ----- Content --------------------------------------------------------- */
.content {
  padding: 48px clamp(20px, 5vw, 64px);
  max-width: calc(var(--content-max) + 128px);
  width: 100%;
}

/* ----- vp-doc typography ---------------------------------------------- */
.vp-doc { max-width: var(--content-max); }
.vp-doc > :first-child { margin-top: 0; }
.vp-doc p { margin: 1em 0; }
.vp-doc ul, .vp-doc ol { padding-left: 1.4em; margin: 1em 0; }
.vp-doc li { margin: 0.25em 0; }
.vp-doc li > p { margin: 0.4em 0; }

.vp-doc h1, .vp-doc h2, .vp-doc h3, .vp-doc h4, .vp-doc h5, .vp-doc h6 {
  font-weight: 650;
  letter-spacing: -0.011em;
  line-height: 1.25;
  scroll-margin-top: calc(var(--topbar-h) + 16px);
}
.vp-doc h1 { font-size: 32px; margin: 0 0 0.4em; letter-spacing: -0.02em; }
.vp-doc h2 {
  font-size: 22px;
  margin: 2.2em 0 0.8em;
  padding-bottom: 0.4em;
  border-bottom: 1px solid var(--border);
}
.vp-doc h3 { font-size: 18px; margin: 1.8em 0 0.6em; }
.vp-doc h4 { font-size: 15.5px; margin: 1.4em 0 0.4em; color: var(--fg-muted); text-transform: none; }
.vp-doc h5, .vp-doc h6 { font-size: 14px; margin: 1.2em 0 0.4em; color: var(--fg-muted); }

/* Heading anchors — subtle, only ink on hover. */
.vp-doc .header-anchor {
  margin-left: 0.4em;
  color: var(--fg-subtle);
  font-weight: 400;
  text-decoration: none;
  opacity: 0;
  transition: opacity 100ms ease, color 100ms ease;
}
.vp-doc h1:hover .header-anchor,
.vp-doc h2:hover .header-anchor,
.vp-doc h3:hover .header-anchor,
.vp-doc h4:hover .header-anchor,
.vp-doc h5:hover .header-anchor,
.vp-doc h6:hover .header-anchor,
.vp-doc .header-anchor:focus { opacity: 1; color: var(--accent); }

/* ----- Inline & block code -------------------------------------------- */
.vp-doc code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 0.15em 0.4em;
  border-radius: 5px;
  border: 1px solid var(--border);
}
.vp-doc a code { color: inherit; }

.vp-doc div[class^="language-"],
.vp-doc div[class*=" language-"] {
  position: relative;
  margin: 1.4em 0;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.vp-doc div[class^="language-"] pre,
.vp-doc div[class*=" language-"] pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  background: transparent;
  font-size: 13px;
  line-height: 1.6;
}
.vp-doc div[class^="language-"] code,
.vp-doc div[class*=" language-"] code {
  background: transparent;
  border: 0;
  padding: 0;
  font-size: inherit;
  color: var(--code-fg);
}

/* Shiki dual-theme: tokens carry both --shiki-light and --shiki-dark. */
.vp-doc .shiki span { color: var(--shiki-light); }
@media (prefers-color-scheme: dark) {
  .vp-doc .shiki span { color: var(--shiki-dark); }
}
.vp-doc .shiki .line { display: inline-block; min-height: 1em; width: 100%; }

/* Language label badge in the top right of every code block. */
.vp-doc .lang {
  position: absolute;
  top: 8px;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-subtle);
  pointer-events: none;
  user-select: none;
}
.vp-doc .lang:empty { display: none; }

/* Scrollbars inside code blocks */
.vp-doc div[class^="language-"] pre::-webkit-scrollbar { height: 8px; }
.vp-doc div[class^="language-"] pre::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 4px;
}

/* ----- Tables ---------------------------------------------------------- */
.vp-doc table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1.4em 0;
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg);
}
.vp-doc thead { background: var(--bg-sunken); }
.vp-doc th, .vp-doc td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.vp-doc th {
  font-weight: 600;
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--fg-muted);
}
.vp-doc tbody tr:last-child td { border-bottom: 0; }
.vp-doc tbody tr:hover { background: var(--accent-softer); }
.vp-doc td code { white-space: nowrap; }

/* ----- Blockquotes ----------------------------------------------------- */
.vp-doc blockquote {
  margin: 1.4em 0;
  padding: 12px 16px;
  border-left: 3px solid var(--accent);
  background: var(--accent-softer);
  color: var(--fg-muted);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.vp-doc blockquote > :first-child { margin-top: 0; }
.vp-doc blockquote > :last-child { margin-bottom: 0; }

/* ----- HR, images ------------------------------------------------------ */
.vp-doc hr {
  border: 0;
  height: 1px;
  background: var(--border);
  margin: 2.4em 0;
}
.vp-doc img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

/* ----- Page footer ----------------------------------------------------- */
.page-footer {
  margin-top: 56px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  font-size: 12.5px;
  color: var(--fg-subtle);
}
.page-footer a { color: var(--fg-muted); }

/* ----- Responsive ------------------------------------------------------ */
@media (max-width: 880px) {
  :root { --sidebar-w: 100%; }
  .layout { grid-template-columns: 1fr; }
  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
  .sidebar-inner { padding: 16px; }
  .content { padding: 28px 20px; }
  .topbar { padding: 0 16px; }
  .source-link { display: none; }
}