:root {
  color-scheme: light;
  --bg: #f7f9fb;
  --panel: #ffffff;
  --panel-muted: #eef3f7;
  --text: #17202a;
  --muted: #627080;
  --line: #dbe3ea;
  --accent: #0f766e;
  --accent-strong: #0b5f59;
  --accent-soft: #dff4ef;
  --shadow: 0 16px 42px rgba(28, 43, 58, 0.12);
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111827;
  --panel: #17202b;
  --panel-muted: #202b38;
  --text: #edf3f8;
  --muted: #a8b4c2;
  --line: #344253;
  --accent: #5eead4;
  --accent-strong: #99f6e4;
  --accent-soft: #143a3a;
  --shadow: 0 16px 42px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.65;
}

a {
  color: var(--accent-strong);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.page-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 292px minmax(0, 1fr);
}

.site-logo {
  color: var(--text);
  display: inline-flex;
  align-items: center;
  font-weight: 750;
  letter-spacing: 0;
  line-height: 1.2;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  background: var(--panel);
  padding: 22px 18px;
}

.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 22px;
}

.sidebar-nav details {
  border-top: 1px solid var(--line);
  padding: 12px 0;
}

.sidebar-nav summary {
  cursor: pointer;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0;
  list-style: none;
  text-transform: uppercase;
}

.sidebar-nav summary::-webkit-details-marker {
  display: none;
}

.sidebar-nav ul {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
}

.sidebar-nav li + li {
  margin-top: 2px;
}

.sidebar-nav a {
  border-radius: var(--radius);
  color: var(--text);
  display: block;
  font-size: 0.94rem;
  line-height: 1.35;
  padding: 8px 10px;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  background: var(--accent-soft);
  color: var(--accent-strong);
  text-decoration: none;
}

.content-shell {
  min-width: 0;
}

.topbar,
.mobile-bar {
  align-items: center;
  background: color-mix(in srgb, var(--panel), transparent 8%);
  border-bottom: 1px solid var(--line);
  display: flex;
  height: 64px;
  justify-content: space-between;
  padding: 0 28px;
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(16px);
}

.mobile-bar {
  display: none;
}

.top-nav {
  display: flex;
  gap: 16px;
  margin-left: auto;
  margin-right: 18px;
}

.top-nav a {
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 650;
}

.theme-toggle,
.icon-button,
.primary-link,
.secondary-link {
  align-items: center;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  cursor: pointer;
  display: inline-flex;
  font: inherit;
  font-weight: 700;
  min-height: 40px;
  padding: 8px 12px;
}

.theme-toggle,
.icon-button,
.secondary-link {
  background: var(--panel);
  color: var(--text);
}

.primary-link {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.primary-link:hover,
.secondary-link:hover {
  text-decoration: none;
}

.main-grid {
  display: grid;
  grid-template-columns: minmax(0, 860px) 250px;
  gap: 42px;
  max-width: 1240px;
  padding: 42px 42px 24px;
}

.article {
  min-width: 0;
}

.article-header {
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
  padding-bottom: 26px;
}

.section-label {
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0;
  margin: 0 0 8px;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4 {
  color: var(--text);
  letter-spacing: 0;
  line-height: 1.25;
}

h1 {
  font-size: 2.35rem;
  margin: 0;
}

h2 {
  border-top: 1px solid var(--line);
  font-size: 1.45rem;
  margin: 36px 0 14px;
  padding-top: 24px;
}

h3 {
  font-size: 1.12rem;
  margin: 28px 0 10px;
}

p,
ul,
ol,
table,
blockquote,
.doc-figure {
  margin-bottom: 18px;
  margin-top: 0;
}

.lead {
  color: var(--muted);
  font-size: 1.04rem;
  margin: 10px 0 0;
  max-width: 760px;
}

.article-body img {
  max-width: 100%;
}

.article-body ul,
.article-body ol {
  padding-left: 1.35rem;
}

.article-body li + li {
  margin-top: 4px;
}

.article-body table {
  border-collapse: collapse;
  display: block;
  overflow-x: auto;
  width: 100%;
}

.article-body th,
.article-body td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.article-body th {
  background: var(--panel-muted);
  font-weight: 800;
}

blockquote {
  background: var(--panel-muted);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  margin-left: 0;
  padding: 14px 16px;
}

.doc-figure {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.doc-figure img {
  display: block;
  height: auto;
  width: 100%;
}

.doc-figure figcaption {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 650;
  padding: 10px 14px;
}

.missing-figure-box {
  align-items: center;
  aspect-ratio: 16 / 8;
  background: repeating-linear-gradient(
    135deg,
    var(--panel-muted),
    var(--panel-muted) 12px,
    var(--panel) 12px,
    var(--panel) 24px
  );
  color: var(--muted);
  display: flex;
  font-weight: 800;
  justify-content: center;
}

.toc-panel {
  align-self: start;
  border-left: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  padding-left: 18px;
  position: sticky;
  top: 88px;
}

.toc-panel strong {
  color: var(--text);
  display: block;
  margin-bottom: 10px;
}

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

.toc-panel nav ul ul {
  border-left: 1px solid var(--line);
  margin-left: 8px;
  padding-left: 12px;
}

.toc-panel a {
  color: var(--muted);
  display: block;
  padding: 5px 0;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  display: flex;
  font-size: 0.92rem;
  gap: 14px;
  margin: 24px 42px 0;
  max-width: 1240px;
  padding: 22px 0 32px;
}

.home-hero {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px;
}

.home-hero h1 {
  max-width: 760px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.home-links {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 26px;
}

.link-group {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}

.link-group h2 {
  border: 0;
  font-size: 1rem;
  margin: 0 0 12px;
  padding: 0;
}

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

.link-group li + li {
  margin-top: 8px;
}

.sidebar-backdrop {
  display: none;
}

.close-sidebar {
  display: none;
}

@media (max-width: 1100px) {
  .main-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .toc-panel {
    display: none;
  }
}

@media (max-width: 820px) {
  .page-shell {
    display: block;
  }

  .mobile-bar {
    display: flex;
  }

  .topbar {
    display: none;
  }

  .sidebar {
    box-shadow: var(--shadow);
    left: 0;
    max-width: 86vw;
    position: fixed;
    top: 0;
    transform: translateX(-105%);
    transition: transform 180ms ease;
    width: 292px;
    z-index: 20;
  }

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

  .sidebar-open .sidebar-backdrop {
    background: rgba(15, 23, 42, 0.36);
    display: block;
    inset: 0;
    position: fixed;
    z-index: 10;
  }

  .close-sidebar {
    display: inline-flex;
  }

  .main-grid {
    padding: 28px 18px 18px;
  }

  .site-footer {
    margin: 18px;
  }

  h1 {
    font-size: 2rem;
  }

  .home-links {
    grid-template-columns: 1fr;
  }
}