:root {
  --bg: #f6f8fc;
  --panel: #ffffff;
  --panel-2: #f1f4fb;
  --line: #d7dfef;
  --text: #0f172a;
  --muted: #475569;
  --link: #2563eb;
  --accent: #0ea5e9;
  --sidebar-width: 280px;
}

:root[data-theme="dark"] {
  --bg: #0b1220;
  --panel: #0f172a;
  --panel-2: #111c33;
  --line: #24324f;
  --text: #e5edff;
  --muted: #9fb0cc;
  --link: #7ecbff;
  --accent: #22d3ee;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: Inter, Segoe UI, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.docs-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: 64px 1fr;
  grid-template-areas:
    "top top"
    "side main";
}

.topbar {
  grid-area: top;
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 18px;
}

.brand {
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
}

.top-links {
  display: flex;
  align-items: center;
  gap: 14px;
}

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 14px;
}

.theme-toggle {
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  font-size: 13px;
}

.sidebar {
  grid-area: side;
  border-right: 1px solid var(--line);
  background: var(--panel);
  padding: 18px 14px 24px;
}

.sidebar-overlay {
  display: none;
}

.sidebar h3 {
  margin: 8px 8px 10px;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav-group { margin-bottom: 10px; }
.nav-item {
  display: block;
  margin: 4px 0;
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--text);
}
.nav-item:hover { background: var(--panel-2); text-decoration: none; }
.nav-item.active {
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--line));
}

.main {
  grid-area: main;
  padding: 24px;
}

.article {
  max-width: 920px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 26px;
}

.main-with-toc {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 250px;
  gap: 16px;
  align-items: start;
}

.toc {
  position: sticky;
  top: 84px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
}

.toc h3 {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc li {
  margin: 0;
}

.toc a {
  display: block;
  padding: 7px 8px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14px;
}

.toc a:hover {
  background: var(--panel-2);
  color: var(--text);
  text-decoration: none;
}

h1 { margin-top: 0; font-size: 40px; line-height: 1.1; }
h2 { margin-top: 28px; border-top: 1px solid var(--line); padding-top: 16px; }
h3 { margin-top: 20px; }
p, li { color: var(--muted); line-height: 1.65; }
ul, ol { padding-left: 22px; }

pre {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  overflow-x: auto;
}
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.callout {
  border: 1px solid color-mix(in srgb, var(--accent) 38%, var(--line));
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border-radius: 10px;
  padding: 12px 14px;
}

@media (max-width: 980px) {
  .docs-shell {
    grid-template-columns: 1fr;
    grid-template-rows: 64px 1fr;
    grid-template-areas:
      "top"
      "main";
  }

  .menu-toggle {
    display: inline-block;
  }

  .top-links a {
    display: none;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: min(86vw, 340px);
    height: 100vh;
    z-index: 30;
    border-right: 1px solid var(--line);
    border-bottom: none;
    transform: translateX(-100%);
    transition: transform 0.22s ease;
    overflow-y: auto;
    padding-top: 78px;
  }

  .docs-shell.nav-open .sidebar {
    transform: translateX(0);
  }

  .sidebar-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 20;
  }

  .docs-shell.nav-open .sidebar-overlay {
    display: block;
  }

  .main { padding: 16px; }
  .article { padding: 18px; }
  h1 { font-size: 32px; }

  .main-with-toc {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    order: -1;
  }
}