:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --fg-muted: #62676d;
  --bg: #fff;
  --bg-alt: #f4f5f6;
  --code-bg: #f4f5f6;
  --accent: #2a6ebb;
  --accent-fg: #fff;
  --border: #e0e2e5;
  --radius: 6px;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e8e8e8;
    --fg-muted: #9a9fa6;
    --bg: #16181c;
    --bg-alt: #1e2126;
    --code-bg: #1e2126;
    --accent: #6ea8e8;
    --accent-fg: #0f1115;
    --border: #2c3036;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
  display: flex;
  min-height: 100vh;
}

/* Sidebar */

nav.sidebar {
  width: 260px;
  flex-shrink: 0;
  padding: 1.5rem 1.25rem 2rem;
  border-right: 1px solid var(--border);
  overflow-y: auto;
  position: sticky;
  top: 0;
  height: 100vh;
}

nav.sidebar > a {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
  padding-bottom: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

nav.sidebar ul {
  list-style: none;
  padding-left: 0;
  margin: 0 0 1.5rem;
}

nav.sidebar > ul > li {
  margin-bottom: 1.5rem;
}

nav.sidebar > ul > li:last-child {
  margin-bottom: 0;
}

/* top-level entries read as section headings for the group beneath them */
nav.sidebar > ul > li > a {
  display: block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--fg-muted);
  text-decoration: none;
  padding: 0.2rem 0.5rem;
  margin-bottom: 0.25rem;
  border-radius: 4px;
}

nav.sidebar li ul { padding-left: 0.5rem; margin: 0; }

nav.sidebar li ul a {
  color: var(--fg);
  text-decoration: none;
  display: block;
  padding: 0.3rem 0.5rem;
  border-radius: 4px;
  font-size: 0.9rem;
}

nav.sidebar a:hover { background: var(--bg-alt); }

nav.sidebar a.current {
  color: var(--accent);
  font-weight: 600;
  background: var(--bg-alt);
}

/* Main content */

main {
  flex: 1;
  min-width: 0;
  padding: 2.5rem 3rem 4rem;
  max-width: 900px;
}

main h1, main h2, main h3, main h4 {
  line-height: 1.25;
  scroll-margin-top: 1.5rem;
}

main h1 {
  font-size: 2rem;
  margin: 0 0 1.5rem;
}

main h2 {
  font-size: 1.4rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

main h3 {
  font-size: 1.1rem;
  margin: 2rem 0 0.75rem;
}

main p { margin: 0 0 1rem; }

main ul, main ol {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

main li { margin-bottom: 0.35rem; }

main a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent);
  text-underline-offset: 2px;
}

main a:hover { text-decoration-color: var(--accent); }

main img {
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  border-radius: var(--radius);
  line-height: 1.5;
  margin: 0 0 1.25rem;
}

pre code { background: none; padding: 0; border: none; font-size: 0.85em; }

code {
  font-family: var(--font-mono);
}

:not(pre) > code {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.15em 0.4em;
  font-size: 0.85em;
}

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--fg-muted);
}

/* Demo trigger buttons (documentation/demo/*.md use .btn / .btn-neutral / .btn-default) */

.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--fg);
  font-size: 0.95rem;
  cursor: context-menu;
  user-select: none;
  transition: background 0.1s ease, border-color 0.1s ease;
}

.btn:hover { border-color: var(--accent); }

.btn-default {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-fg);
  cursor: pointer;
}

.btn.context-menu-disabled,
.btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}

@media (max-width: 760px) {
  body { flex-direction: column; }

  nav.sidebar {
    width: 100%;
    height: auto;
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  main { padding: 1.5rem; }
}