/* Dart Innovations Docs */
:root {
  --ink: #152230;
  --ink-2: #44535f;
  --ink-3: #6b7884;
  --paper: #ffffff;
  --panel: #f4f7f9;
  --rule: #dde5ec;
  --brand: #0864a8;
  --brand-ink: #ffffff;
  --code-bg: #f3f6f8;
  --code-ink: #1d2b38;
  --mark: #fff2b3;
  --shadow: 0 18px 50px rgba(21, 34, 48, .18);
  --p: var(--brand);
  --top: 60px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #e4ebf1; --ink-2: #b4c0ca; --ink-3: #8a97a3; --paper: #10181f; --panel: #151f28;
    --rule: #26333e; --brand: #5aaee8; --brand-ink: #0b1218; --code-bg: #18232d; --code-ink: #dbe5ed;
    --mark: #5a4a05; --shadow: 0 18px 50px rgba(0, 0, 0, .5); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --ink: #e4ebf1; --ink-2: #b4c0ca; --ink-3: #8a97a3; --paper: #10181f; --panel: #151f28;
  --rule: #26333e; --brand: #5aaee8; --brand-ink: #0b1218; --code-bg: #18232d; --code-ink: #dbe5ed;
  --mark: #5a4a05; --shadow: 0 18px 50px rgba(0, 0, 0, .5); color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--top) + 16px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 400 16px/1.65 "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  display: flex; flex-direction: column; min-height: 100vh;
}
a { color: var(--brand); text-underline-offset: 2px; }
img { max-width: 100%; height: auto; }
svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; flex: none; }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; border-radius: 4px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--brand); color: var(--brand-ink); padding: 8px 14px; border-radius: 6px; z-index: 100; }
.skip:focus { left: 12px; }
kbd { font: 500 11px/1 "IBM Plex Mono", monospace; border: 1px solid var(--rule); border-bottom-width: 2px; border-radius: 5px; padding: 3px 6px; color: var(--ink-3); background: var(--paper); }

/* ---------------------------------------------------------------- top bar */
.topbar { position: sticky; top: 0; z-index: 30; height: var(--top); background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--rule); }
.topbar-in { height: 100%; max-width: 1480px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; gap: 14px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-weight: 600; flex: none; }
.brand img { height: 30px; width: auto; display: block; }
.brand span { padding-left: 10px; border-left: 1px solid var(--rule); font-size: 15px; }
:root[data-theme="dark"] .brand img { filter: brightness(0) invert(1); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .brand img { filter: brightness(0) invert(1); } }

.pm { position: relative; }
.pm summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: 6px; padding: 7px 10px; border-radius: 8px; font-weight: 500; font-size: 14px; color: var(--ink-2); }
.pm summary::-webkit-details-marker { display: none; }
.pm-label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 220px; }
.pm summary:hover, .pm[open] summary { background: var(--panel); color: var(--ink); }
.pm summary svg { width: 15px; height: 15px; transition: transform .15s; }
.pm[open] summary svg { transform: rotate(180deg); }
.pm-panel { position: absolute; top: calc(100% + 8px); left: 0; width: 360px; background: var(--paper); border: 1px solid var(--rule); border-radius: 12px; box-shadow: var(--shadow); padding: 8px; }
.pm-panel a { display: flex; gap: 12px; padding: 10px 12px; border-radius: 8px; text-decoration: none; color: var(--ink); }
.pm-panel a:hover, .pm-panel a[aria-current] { background: var(--panel); }
.pm-panel strong { display: block; font-weight: 600; font-size: 14px; }
.pm-panel small { display: block; color: var(--ink-3); font-size: 13px; line-height: 1.4; }
.pm-dot { width: 10px; height: 10px; border-radius: 3px; background: var(--p); margin-top: 5px; flex: none; }

.search-btn { margin-left: auto; display: flex; align-items: center; gap: 10px; min-width: 240px; padding: 7px 10px 7px 12px; border: 1px solid var(--rule); border-radius: 9px; background: var(--panel); color: var(--ink-3); font: inherit; font-size: 14px; cursor: pointer; }
.search-btn span { flex: 1; text-align: left; }
.search-btn:hover { border-color: var(--ink-3); }
.theme-btn, .nav-toggle { display: grid; place-items: center; width: 36px; height: 36px; border: 0; border-radius: 8px; background: none; color: var(--ink-2); cursor: pointer; }
.theme-btn:hover, .nav-toggle:hover { background: var(--panel); }
.i-moon { display: none; }
:root[data-theme="dark"] .i-sun { display: none; } :root[data-theme="dark"] .i-moon { display: block; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .i-sun { display: none; } :root:not([data-theme="light"]) .i-moon { display: block; } }
.site-link { font-size: 14px; color: var(--ink-2); text-decoration: none; white-space: nowrap; }
.site-link:hover { color: var(--brand); }
.nav-toggle { display: none; }

/* ---------------------------------------------------------------- doc layout */
.shell { flex: 1; width: 100%; max-width: 1480px; margin: 0 auto; display: grid; grid-template-columns: 280px minmax(0, 1fr) 230px; }
.sidebar { position: sticky; top: var(--top); height: calc(100vh - var(--top)); overflow-y: auto; padding: 26px 18px 40px 20px; border-right: 1px solid var(--rule); box-shadow: inset 3px 0 0 var(--p); font-size: 14.5px; }
.sb-product { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 16px; color: var(--ink); text-decoration: none; padding: 4px 10px 14px; }
.sb-dot { width: 12px; height: 12px; border-radius: 3px; background: var(--p); }
.sb-group { margin-top: 18px; }
.sb-group-title { font-size: 13px; font-weight: 600; color: var(--ink-3); padding: 0 10px 6px; }
.sb-link { display: block; padding: 6px 10px; border-radius: 7px; color: var(--ink-2); text-decoration: none; line-height: 1.4; }
.sb-link:hover { background: var(--panel); color: var(--ink); }
.sb-link.is-current { background: color-mix(in srgb, var(--p) 12%, transparent); color: var(--ink); font-weight: 600; box-shadow: inset 3px 0 0 var(--p); }
.sb-sub { padding-left: 24px; font-size: 14px; }

.doc { min-width: 0; padding: 34px 56px 64px; }
.doc article { max-width: 760px; }
.crumbs { display: flex; gap: 8px; font-size: 13.5px; color: var(--ink-3); margin-bottom: 14px; }
.crumbs a { color: var(--ink-3); text-decoration: none; } .crumbs a:hover { color: var(--brand); }
.doc h1 { font-size: clamp(30px, 3.2vw, 40px); line-height: 1.15; letter-spacing: -.02em; font-weight: 700; margin: 0 0 12px; }
.lede { font-size: 18.5px; line-height: 1.55; color: var(--ink-2); margin: 0 0 30px; max-width: 64ch; }

.toc { position: sticky; top: var(--top); height: calc(100vh - var(--top)); overflow-y: auto; padding: 34px 20px 40px 8px; font-size: 13.5px; }
.toc-title { font-weight: 600; color: var(--ink); margin-bottom: 10px; }
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--rule); }
.toc li a { display: block; padding: 4px 0 4px 14px; margin-left: -1px; border-left: 2px solid transparent; color: var(--ink-3); text-decoration: none; line-height: 1.4; }
.toc li.toc-sub a { padding-left: 26px; }
.toc li a:hover { color: var(--ink); }
.toc li a.is-active { color: var(--ink); border-left-color: var(--p); }

/* ---------------------------------------------------------------- prose */
.prose { font-size: 16.5px; max-width: 72ch; }
.prose > :first-child { margin-top: 0; }
.prose h2 { font-size: 24px; line-height: 1.3; letter-spacing: -.01em; margin: 46px 0 12px; padding-top: 8px; font-weight: 700; }
.prose h3 { font-size: 19px; line-height: 1.35; margin: 32px 0 8px; font-weight: 600; }
.prose h4 { font-size: 16.5px; margin: 24px 0 6px; font-weight: 600; }
.prose p, .prose ul, .prose ol, .prose dl, .prose table, .prose pre, .prose figure, .prose .admonition { margin: 0 0 18px; }
.prose ul, .prose ol { padding-left: 24px; }
.prose li { margin: 5px 0; }
.prose li > ul, .prose li > ol { margin: 6px 0; }
.prose ol > li::marker { font-weight: 600; color: var(--ink-2); }
.prose strong { font-weight: 600; }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 36px 0; }
.headerlink { opacity: 0; margin-left: 8px; text-decoration: none; color: var(--ink-3); font-weight: 400; }
h2:hover .headerlink, h3:hover .headerlink, .headerlink:focus { opacity: 1; }
.prose img { display: block; border: 1px solid var(--rule); border-radius: 10px; margin: 8px 0 22px; }
.prose figure img { margin-bottom: 8px; }
.prose figcaption { font-size: 14px; color: var(--ink-3); }
.prose dt { font-weight: 600; } .prose dd { margin: 2px 0 12px 0; color: var(--ink-2); }

.prose code { font: 500 .88em/1.5 "IBM Plex Mono", ui-monospace, Consolas, monospace; background: var(--code-bg); color: var(--code-ink); padding: 2px 6px; border-radius: 5px; border: 1px solid var(--rule); overflow-wrap: anywhere; }
.prose pre, .prose .hl pre { position: relative; background: var(--code-bg); border: 1px solid var(--rule); border-radius: 10px; padding: 16px 18px; overflow-x: auto; font-size: 14px; line-height: 1.6; }
.prose pre code { background: none; border: 0; padding: 0; font-size: inherit; color: var(--code-ink); overflow-wrap: normal; }
.prose .hl { position: relative; margin: 0 0 18px; }
.prose .hl pre { margin: 0; }
.copy-btn { position: absolute; top: 8px; right: 8px; font: 500 12px/1 "IBM Plex Sans", sans-serif; padding: 6px 9px; border-radius: 6px; border: 1px solid var(--rule); background: var(--paper); color: var(--ink-2); cursor: pointer; opacity: 0; transition: opacity .15s; }
.prose pre:hover .copy-btn, .prose .hl:hover .copy-btn, .copy-btn:focus { opacity: 1; }
/* syntax colours (Pygments short classes) */
.hl .k, .hl .kd, .hl .kn, .hl .kr, .hl .kt, .hl .nt { color: #0b5cad; }
.hl .s, .hl .s1, .hl .s2, .hl .sd, .hl .na + .o + .s { color: #a3480b; }
.hl .na, .hl .nb, .hl .nf, .hl .nc { color: #6b3fa0; }
.hl .c, .hl .c1, .hl .cm, .hl .cs { color: #6b7884; font-style: italic; }
.hl .mi, .hl .mf, .hl .m, .hl .kc { color: #0a7a52; }
:root[data-theme="dark"] .hl .k, :root[data-theme="dark"] .hl .kd, :root[data-theme="dark"] .hl .kn, :root[data-theme="dark"] .hl .kt, :root[data-theme="dark"] .hl .nt { color: #7cc0ff; }
:root[data-theme="dark"] .hl .s, :root[data-theme="dark"] .hl .s1, :root[data-theme="dark"] .hl .s2 { color: #f2a971; }
:root[data-theme="dark"] .hl .na, :root[data-theme="dark"] .hl .nb, :root[data-theme="dark"] .hl .nf { color: #c9a6f2; }
:root[data-theme="dark"] .hl .mi, :root[data-theme="dark"] .hl .kc { color: #6fd6a8; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .hl .k, :root:not([data-theme="light"]) .hl .kd, :root:not([data-theme="light"]) .hl .kn, :root:not([data-theme="light"]) .hl .kt, :root:not([data-theme="light"]) .hl .nt { color: #7cc0ff; }
  :root:not([data-theme="light"]) .hl .s, :root:not([data-theme="light"]) .hl .s1, :root:not([data-theme="light"]) .hl .s2 { color: #f2a971; }
  :root:not([data-theme="light"]) .hl .na, :root:not([data-theme="light"]) .hl .nb, :root:not([data-theme="light"]) .hl .nf { color: #c9a6f2; }
  :root:not([data-theme="light"]) .hl .mi, :root:not([data-theme="light"]) .hl .kc { color: #6fd6a8; }
}

.prose table { width: 100%; border-collapse: collapse; font-size: 15px; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; vertical-align: top; padding: 9px 14px 9px 0; border-bottom: 1px solid var(--rule); }
.prose th { font-weight: 600; color: var(--ink); border-bottom-width: 2px; white-space: nowrap; }
.prose td code { white-space: nowrap; }

.admonition { border: 1px solid var(--rule); border-left: 4px solid var(--brand); border-radius: 8px; padding: 12px 16px; background: var(--panel); }
.admonition > :last-child { margin-bottom: 0; }
.admonition-title { font-weight: 600; margin: 0 0 4px; }
.admonition.tip { border-left-color: #1d8a5a; }
.admonition.warning { border-left-color: #c98a00; }
.admonition.danger { border-left-color: #c0392b; }

.pager { max-width: 760px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 56px; padding-top: 24px; border-top: 1px solid var(--rule); }
.pn { display: block; padding: 14px 16px; border: 1px solid var(--rule); border-radius: 10px; text-decoration: none; color: var(--ink); font-weight: 600; }
.pn small { display: block; font-weight: 400; color: var(--ink-3); font-size: 13px; }
.pn:hover { border-color: var(--p); }
.pn-next { text-align: right; grid-column: 2; }

/* ---------------------------------------------------------------- home */
.home { flex: 1; width: 100%; max-width: 1180px; margin: 0 auto; padding: 72px 24px 80px; }
.home-hero { max-width: 760px; margin-bottom: 56px; }
.home-hero h1 { font-size: clamp(36px, 5vw, 56px); line-height: 1.05; letter-spacing: -.03em; margin: 0 0 18px; font-weight: 700; }
.home-intro { font-size: 19px; color: var(--ink-2); line-height: 1.55; }
.home-intro p { margin: 0 0 12px; }
.home-search { margin-top: 22px; width: 100%; max-width: 620px; display: flex; align-items: center; gap: 12px; padding: 14px 16px; border: 1px solid var(--rule); border-radius: 12px; background: var(--paper); color: var(--ink-3); font: inherit; font-size: 16px; cursor: pointer; box-shadow: 0 1px 0 var(--rule); }
.home-search span { flex: 1; text-align: left; }
.home-search:hover { border-color: var(--brand); }
.prod-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 44px 40px; }
.prod { border-top: 4px solid var(--p); padding-top: 18px; }
.prod h2 { font-size: 22px; margin: 0 0 6px; letter-spacing: -.01em; }
.prod h2 a { color: var(--ink); text-decoration: none; }
.prod h2 a:hover { color: var(--p); }
.prod p { margin: 0 0 14px; color: var(--ink-2); font-size: 15.5px; line-height: 1.55; }
.prod ul { list-style: none; margin: 0; padding: 0; font-size: 15px; }
.prod li { border-top: 1px solid var(--rule); }
.prod li a { display: block; padding: 8px 0; color: var(--ink); text-decoration: none; }
.prod li a:hover { color: var(--p); }

.notfound { flex: 1; max-width: 680px; margin: 0 auto; padding: 90px 24px; }
.notfound h1 { font-size: 40px; margin: 0 0 10px; }
.nf-list { margin-top: 28px; padding-left: 20px; }

/* ---------------------------------------------------------------- search dialog */
.search { width: min(680px, calc(100% - 24px)); max-height: min(620px, calc(100vh - 80px)); margin: 8vh auto auto; padding: 0; border: 1px solid var(--rule); border-radius: 14px; background: var(--paper); color: var(--ink); box-shadow: var(--shadow); }
.search::backdrop { background: rgba(10, 20, 30, .45); }
.search-box { display: flex; align-items: center; gap: 10px; padding: 14px 16px; border-bottom: 1px solid var(--rule); }
.search-box input { flex: 1; border: 0; outline: 0; background: none; color: var(--ink); font: inherit; font-size: 17px; }
.search-close { font: 500 12px/1 "IBM Plex Mono", monospace; border: 1px solid var(--rule); border-radius: 6px; background: var(--panel); color: var(--ink-3); padding: 5px 8px; cursor: pointer; }
.search-results { list-style: none; margin: 0; padding: 8px; max-height: 470px; overflow-y: auto; }
.search-results li a { display: block; padding: 10px 12px; border-radius: 9px; text-decoration: none; color: var(--ink); }
.search-results li a[aria-selected="true"], .search-results li a:hover { background: var(--panel); }
.sr-prod { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--ink-3); }
.sr-prod::before { content: ""; width: 8px; height: 8px; border-radius: 2px; background: var(--c); }
.sr-title { display: block; font-weight: 600; }
.sr-snip { display: block; font-size: 14px; color: var(--ink-2); line-height: 1.45; margin-top: 2px; }
.sr-snip mark { background: var(--mark); color: inherit; border-radius: 3px; padding: 0 2px; }
.search-hint { margin: 0; padding: 10px 18px; border-top: 1px solid var(--rule); font-size: 13px; color: var(--ink-3); }
.search-empty { padding: 18px 12px; color: var(--ink-3); }

/* ---------------------------------------------------------------- footer */
.footer { border-top: 1px solid var(--rule); font-size: 14px; color: var(--ink-3); }
.footer-in { max-width: 1480px; margin: 0 auto; padding: 20px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer nav { display: flex; gap: 18px; }
.footer a { color: var(--ink-2); text-decoration: none; } .footer a:hover { color: var(--brand); }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 1240px) {
  .shell { grid-template-columns: 260px minmax(0, 1fr); }
  .toc { display: none; }
  .doc { padding: 30px 40px 60px; }
}
@media (max-width: 980px) { .prod-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .site-link { display: none; } }
@media (max-width: 860px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .nav-toggle { display: grid; }
  .sidebar { position: fixed; z-index: 25; top: var(--top); left: 0; width: min(320px, 86vw); background: var(--paper); transform: translateX(-102%); transition: transform .2s ease; box-shadow: var(--shadow), inset 3px 0 0 var(--p); }
  body.nav-open .sidebar { transform: none; }
  .doc { padding: 24px 16px 56px; }
  .search-btn { min-width: 0; }
  .search-btn span, .search-btn kbd { display: none; }
  .pm-panel { position: fixed; left: 12px; right: 12px; width: auto; top: calc(var(--top) + 6px); }
  .home { padding: 44px 16px 64px; }
}
body:not(.has-sidebar) .nav-toggle { display: none; }
@media (max-width: 600px) {
  .topbar-in { padding: 0 10px; gap: 6px; }
  .brand span { display: none; }
  .pm-label { max-width: 110px; }
  .home-search kbd { display: none; }
  .brand img { height: 26px; }
  .prod-grid { grid-template-columns: minmax(0, 1fr); }
  .pager { grid-template-columns: 1fr; } .pn-next { grid-column: 1; }
  .prose { font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }
@media print { .topbar, .sidebar, .toc, .pager, .footer { display: none; } .shell { display: block; } }