:root {
  color-scheme: light;
  --bg: #f7f7f4;
  --panel: #ffffff;
  --text: #1d2528;
  --muted: #667174;
  --line: #d9dfdc;
  --accent: #0f766e;
  --accent-strong: #115e59;
  --code-bg: #eef2ef;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

a {
  color: var(--accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
  padding: 10px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
}

.brand {
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

.language-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.lang-link {
  min-height: 34px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
}

.lang-link.active {
  border-color: var(--accent);
  background: #e0f2ee;
  color: var(--accent-strong);
}

.layout {
  display: grid;
  grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
  max-width: 1320px;
  margin: 0 auto;
}

.sidebar {
  position: sticky;
  top: 57px;
  align-self: start;
  height: calc(100vh - 57px);
  overflow: auto;
  padding: 22px 16px;
  border-right: 1px solid var(--line);
}

.nav-link {
  display: block;
  padding: 6px 8px;
  border-radius: 6px;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.35;
}

.nav-home {
  display: block;
  margin: 2px 0 16px;
  padding: 7px 8px;
  border-radius: 6px;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.nav-section-title {
  margin: 20px 0 8px;
  padding: 0 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
}

.nav-subsection-title {
  margin: 10px 0 2px;
  padding: 0 8px;
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 700;
}

.nav-collapsible {
  margin: 4px 0;
}

.nav-collapsible > summary.nav-subsection-title {
  display: flex;
  align-items: center;
  gap: 6px;
  border-radius: 6px;
  cursor: pointer;
  list-style: none;
  padding: 5px 8px;
}

.nav-collapsible > summary.nav-subsection-title::-webkit-details-marker {
  display: none;
}

.nav-collapsible > summary.nav-subsection-title::before {
  content: "+";
  width: 10px;
  color: var(--muted);
  font-weight: 700;
}

.nav-collapsible[open] > summary.nav-subsection-title::before {
  content: "-";
}

.nav-collapsible > summary.nav-subsection-title:hover {
  background: #e7eee9;
}

.nav-collapsible-body {
  margin: 2px 0 8px;
}

.nav-link:hover,
.nav-link.active,
.nav-home:hover,
.nav-home.active {
  background: #e7eee9;
  color: var(--accent-strong);
}

.depth-1 { padding-left: 18px; }
.depth-2 { padding-left: 30px; }
.depth-3 { padding-left: 42px; }
.depth-4,
.depth-5,
.depth-6 { padding-left: 54px; }

.content {
  min-width: 0;
  max-width: 920px;
  padding: 36px 42px 72px;
}

.content h1,
.content h2,
.content h3,
.content h4 {
  line-height: 1.25;
}

.content h1 {
  margin-top: 0;
  font-size: 34px;
}

.content h2 {
  margin-top: 36px;
  border-top: 1px solid var(--line);
  padding-top: 24px;
}

code {
  border-radius: 5px;
  background: var(--code-bg);
  padding: 1px 5px;
  font-size: 0.94em;
}

pre {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #172024;
  padding: 16px;
}

pre code {
  background: transparent;
  color: #eef7f3;
  padding: 0;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  background: var(--panel);
}

th,
td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}

blockquote {
  margin: 18px 0;
  border-left: 4px solid var(--accent);
  padding-left: 14px;
  color: var(--muted);
}

.indent-1 { margin-left: 18px; }
.indent-2 { margin-left: 36px; }
.indent-3,
.indent-4,
.indent-5,
.indent-6 { margin-left: 54px; }

.home {
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.home-content {
  width: min(760px, calc(100vw - 32px));
  padding: 48px 0;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-strong);
  font-weight: 700;
}

.home h1 {
  margin: 0;
  font-size: 42px;
  line-height: 1.15;
}

.summary {
  margin: 14px 0 28px;
  color: var(--muted);
}

.language-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.language-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 96px;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 18px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}

.language-card span {
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
}

@media (max-width: 820px) {
  .topbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .layout {
    display: block;
  }

  .sidebar {
    position: static;
    height: auto;
    max-height: 320px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .content {
    padding: 28px 20px 56px;
  }

  .language-grid {
    grid-template-columns: 1fr;
  }
}