/* VitePress-like documentation layout */
:root {
  --dl-bg: #ffffff;
  --dl-fg: #213547;
  --dl-muted: #67707a;
  --dl-border: #e2e2e3;
  --dl-brand: #3451b2;
  --dl-brand-soft: #e6ebff;
  --dl-accent: #3451b2; /* green used for "Return to top" */
  --dl-code-bg: #f6f6f7;
  --dl-sidebar-w: 272px;
  --dl-toc-w: 240px;
  --dl-topbar-h: 52px;
  --dl-subbar-h: 48px;
  --dl-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
}

/* * { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--dl-font);
  color: var(--dl-fg);
  background: var(--dl-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--dl-brand); text-decoration: none; }
a:hover { text-decoration: underline; } */

.dl-root { min-height: calc(100vh - var(--dl-topbar-h)); }

/* ---------- Topbar ---------- */
.dl-topbar {
  position: sticky; top: 0; z-index: 30;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(150%) blur(8px);
  border-bottom: 1px solid var(--dl-border);
}
.dl-topbar-inner {
  height: var(--dl-topbar-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px;
  max-width: 1440px; margin: 0 auto;
}
.dl-brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 18px; }
.dl-nav { display: flex; gap: 20px; }
.dl-nav-link { color: var(--dl-fg); font-size: 14px; font-weight: 500; }
.dl-nav-link:hover { color: var(--dl-brand); text-decoration: none; }

/* ---------- Sub-bar with Menu + On this page ---------- */
.dl-subbar {
  position: sticky; top: var(--dl-topbar-h); z-index: 25;
  background: var(--dl-bg);
  border-bottom: 1px solid var(--dl-border);
}
.dl-subbar-inner {
  max-width: 1440px; margin: 0 auto;
  height: var(--dl-subbar-h);
  padding: 0 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.dl-mbtn {
  background: none; border: none; padding: 8px 4px;
  font: inherit; font-size: 14px; color: var(--dl-muted);
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 8px;
}
.dl-mbtn:hover { color: var(--dl-fg); }
.dl-mbtn-active { color: var(--dl-fg); }
.dl-mbtn:disabled { color: #c0c4cc; cursor: not-allowed; }
.dl-mbtn-icn { display: inline-flex; }
.dl-caret { display: inline-flex; transition: transform .2s ease; }
.dl-caret-open { transform: rotate(180deg); }

/* ---------- On this page dropdown ---------- */
.dl-toc-wrap { position: relative; margin-left: auto; }
.dl-toc-dropdown {
  position: absolute; top: calc(100% + 6px); right: 0;
  min-width: 260px; max-width: 90vw;
  max-height: 70vh; overflow-y: auto;
  background: var(--dl-bg);
  border: 1px solid var(--dl-border);
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
  padding: 12px 4px;
  z-index: 40;
}
.dl-toc-return {
  display: block; padding: 8px 12px;
  color: var(--dl-accent); font-size: 14px; font-weight: 500;
}
.dl-toc-return:hover { text-decoration: none; opacity: .85; }
.dl-toc-sep {
  height: 1px; background: var(--dl-border); margin: 8px 20px;
}
.dl-toc-list { list-style: none !important; padding: 0; margin: 0 !important; }
.dl-toc-list li { margin: 0; }
.dl-toc-link {
  display: block; padding: 8px 20px; font-size: 14px;
  color: var(--dl-fg); line-height: 1.4;
}
.dl-toc-link:hover { text-decoration: none; background: var(--dl-code-bg); }
.dl-toc-active { color: var(--dl-brand) !important; font-weight: 600; }
.dl-toc-l3 .dl-toc-link { padding-left: 36px; }
.dl-toc-l4 .dl-toc-link { padding-left: 52px; }

/* ---------- Shell (sidebar + content) ---------- */
.dl-shell {
  display: grid;
  grid-template-columns: var(--dl-sidebar-w) minmax(0, 1fr) var(--dl-toc-w);
  max-width: 1440px;
  margin: 0 auto;
}
.dl-shell-no-sidebar {
  grid-template-columns: minmax(0, 1fr) var(--dl-toc-w);
}

/* ---------- Left sidebar ---------- */
.dl-sidebar {
  border-right: 1px solid var(--dl-border);
  padding: 32px 24px;
  position: sticky; top: var(--dl-topbar-h);
  height: calc(100vh - var(--dl-topbar-h));
  overflow-y: auto;
  scrollbar-gutter: stable;
  scrollbar-width: thin;
  scrollbar-color: rgba(52, 81, 178, 0.34) transparent;
}
.dl-sidebar:hover { scrollbar-color: rgba(52, 81, 178, 0.58) transparent; }
.dl-sidebar::-webkit-scrollbar { width: 8px; }
.dl-sidebar::-webkit-scrollbar-track { background: transparent; }
.dl-sidebar::-webkit-scrollbar-thumb {
  background-color: rgba(52, 81, 178, 0.28);
  border: 2px solid var(--dl-bg);
  border-radius: 999px;
}
.dl-sidebar:hover::-webkit-scrollbar-thumb { background-color: rgba(52, 81, 178, 0.52); }
.dl-sidebar::-webkit-scrollbar-thumb:hover { background-color: rgba(52, 81, 178, 0.68); }
.dl-group + .dl-group { margin-top: 24px; }
.dl-group-title {
  font-size: 13px; font-weight: 700; letter-spacing: .3px;
  color: var(--dl-fg); margin-bottom: 8px;
}
.dl-group-list { list-style: none !important; padding: 0; margin: 0 !important; }
.dl-group-list li { margin: 2px 0; }
.dl-link {
  display: block; padding: 6px 10px; border-radius: 6px;
  color: var(--dl-muted); font-size: 14px;
}
.dl-link:hover { color: var(--dl-fg); background: var(--dl-code-bg); text-decoration: none; }
.dl-link-active {
  color: var(--dl-brand);
  /* background: var(--dl-brand-soft); */
  font-weight: 600;
}

/* ---------- Main content ---------- */
.dl-main {
  padding: 40px 48px 80px;
  min-width: 0;
}
.dl-article { max-width: 720px; }
.dl-article h1 { font-size: 32px; margin: 0 0 24px; letter-spacing: -0.02em; }
.dl-article h2 {
  font-size: 24px; margin: 48px 0 16px; padding-top: 24px;
  border-top: 1px solid var(--dl-border); letter-spacing: -0.02em;
  scroll-margin-top: calc(var(--dl-topbar-h) + 16px);
  margin-top: 64px !important; /* extra space to fix bulma style */
}
.dl-article h3 {
  font-size: 20px; margin: 32px 0 12px;
  scroll-margin-top: calc(var(--dl-topbar-h) + 16px);
}
.dl-article p { margin: 16px 0; }
.dl-article code {
  background: var(--dl-code-bg); padding: 2px 6px; border-radius: 4px;
  font-size: 0.9em; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.dl-article pre {
  background: #f6f6f7; padding: 16px 20px; border-radius: 8px;
  overflow-x: auto; font-size: 14px;
}
.dl-article pre code { background: transparent; padding: 0; }
/* .dl-article ul, .dl-article ol { padding-left: 24px; } */
.dl-article blockquote {
  margin: 16px 0; padding: 8px 16px; border-left: 3px solid var(--dl-brand);
  color: var(--dl-muted); background: #f9fafb;
}
.dl-empty { color: var(--dl-muted); font-style: italic; }

/* ---------- Prev / Next ---------- */
.dl-prevnext {
  max-width: 720px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  margin-top: 64px; padding-top: 24px; border-top: 1px solid var(--dl-border);
}
.dl-pn {
  display: flex; flex-direction: column; padding: 12px 16px;
  border: 1px solid var(--dl-border); border-radius: 8px;
  color: var(--dl-fg); transition: border-color .15s;
}
.dl-pn:hover { border-color: var(--dl-brand); text-decoration: none; }
.dl-next { text-align: right; }
.dl-pn-label { font-size: 12px; color: var(--dl-muted); }
.dl-pn-title { font-weight: 600; color: var(--dl-brand); margin-top: 4px; }

.dl-footer { max-width: 720px; margin-top: 48px; color: var(--dl-muted); font-size: 13px; }

/* ---------- Right sidebar: On this page (desktop) ---------- */
.dl-toc-right {
  padding: 40px 24px 40px 16px;
  position: sticky; top: var(--dl-topbar-h);
  height: calc(100vh - var(--dl-topbar-h));
  overflow-y: auto;
  font-size: 13px;
}
.dl-toc-right-title {
  font-size: 13px; font-weight: 700; color: var(--dl-fg);
  margin: 0 0 12px 12px; letter-spacing: .2px;
}
.dl-toc-right .dl-toc-list { border-left: 1px solid var(--dl-border); }
.dl-toc-right .dl-toc-link {
  padding: 4px 12px; font-size: 13px; color: var(--dl-muted);
  border-left: 1px solid transparent; margin-left: -1px;
}
.dl-toc-right .dl-toc-link:hover { background: transparent; color: var(--dl-fg); }
.dl-toc-right .dl-toc-active {
  border-left-color: var(--dl-brand);
  color: var(--dl-brand) !important;
}
.dl-toc-right .dl-toc-l3 .dl-toc-link { padding-left: 24px; }
.dl-toc-right .dl-toc-l4 .dl-toc-link { padding-left: 36px; }
.dl-toc-return-bottom {
  display: inline-block; margin: 20px 0 0 0;
  font-size: 13px; color: var(--dl-accent);
}
.dl-toc-right-empty .dl-toc-return-bottom { margin-top: 0; }

/* ---------- Left drawer (mobile) ---------- */
.dl-drawer {
  position: fixed; top: 0; left: 0; bottom: 0;
  width: 320px; max-width: 85vw; background: var(--dl-bg);
  z-index: 60; transform: translateX(-100%); transition: transform .25s ease;
  box-shadow: 2px 0 20px rgba(0,0,0,0.1);
  height: 100vh; overflow-y: auto;
}
.dl-drawer.dl-open { transform: translateX(0); }
.dl-drawer-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 20px; border-bottom: 1px solid var(--dl-border); font-weight: 600;
}
.dl-close { background: none; border: none; font-size: 18px; cursor: pointer; color: var(--dl-muted); }
.dl-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.35);
  z-index: 50;
}

/* ---------- Responsive ---------- */

/* Compact: sidebar stays visible, but the right TOC is hidden to keep content wide.
   The "On this page" sub-bar does NOT appear here — it only shows up in mobile mode. */
@media (max-width: 1100px) {
  .dl-shell { grid-template-columns: var(--dl-sidebar-w) minmax(0, 1fr); }
  .dl-shell-no-sidebar { grid-template-columns: minmax(0, 1fr); }
  .dl-toc-right { display: none; }
  .dl-main { padding: 32px 40px 80px; }
}

/* Mobile: sidebar becomes a drawer and the sub-bar (Menu + On this page) appears. */
@media (max-width: 960px) {
  .dl-shell { grid-template-columns: minmax(0, 1fr); }
  .dl-sidebar:not(.dl-drawer) { display: none; }
  .dl-toc-right { display: none; }
  .dl-nav { display: none; }
  .dl-main { padding: 24px 20px 60px; }
  .dl-prevnext { grid-template-columns: 1fr; }
  /* Fixed to viewport so the dropdown never overflows narrow screens */
  .dl-toc-dropdown {
    position: fixed;
    top: calc(var(--dl-topbar-h) + var(--dl-subbar-h) + 6px);
    left: 12px; right: 12px;
    min-width: 0; max-width: none;
  }
  .dl-article h2, .dl-article h3 {
    scroll-margin-top: calc(var(--dl-topbar-h) + var(--dl-subbar-h) + 16px);
  }
}