:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #555;
  --border: #ddd;
  --accent: #2563eb;
  --highlight: #fef08a;
  --nav-width: 16rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 0.5rem 1rem;
  background: var(--fg);
  color: var(--bg);
  z-index: 100;
}

.skip:focus {
  left: 0.5rem;
  top: 0.5rem;
}

.top {
  border-bottom: 1px solid var(--border);
  background: #fff;
  position: sticky;
  top: 0;
  z-index: 50;
}

.top-inner {
  max-width: 56rem;
  margin: 0 auto;
  padding: 0.6rem 1.25rem;
}

.site-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.search-wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.toc-search {
  flex-direction: column;
  align-items: stretch;
  margin-bottom: 0.85rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border);
}

#search {
  flex: 1;
  width: 100%;
  min-width: 0;
  max-width: none;
  padding: 0.45rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  background: #fff;
}

#search:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.search-meta {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.3;
}

.toc-search .search-meta {
  min-height: 1.1em;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  max-width: 56rem;
  margin: 0 auto;
  padding: 1.25rem;
  gap: 2rem;
}

@media (min-width: 52rem) {
  .layout {
    grid-template-columns: var(--nav-width) minmax(0, 1fr);
    align-items: start;
  }
}

.toc {
  position: sticky;
  top: 3.25rem;
  align-self: start;
  padding: 0;
  font-size: 0.9rem;
  max-height: calc(100vh - 3.5rem);
  overflow-y: auto;
}

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

.toc-root > .toc-part,
.toc-root > .toc-leaf {
  margin-bottom: 0.35rem;
}

.toc-root > .toc-part {
  margin-bottom: 0.75rem;
}

.toc-leaf a {
  color: var(--muted);
  text-decoration: none;
  border-radius: 4px;
  display: block;
  padding: 0.2rem 0;
  line-height: 1.35;
}

.toc-leaf a:hover,
.toc-leaf a:focus-visible {
  color: var(--accent);
}

.toc-leaf a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.toc-leaf.toc-leaf--hidden {
  display: none;
}

.toc-part-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--muted);
  margin: 0.6rem 0 0.35rem;
}

.toc-root > .toc-part:first-child .toc-part-label {
  margin-top: 0;
}

.toc-nested {
  margin: 0;
  padding: 0 0 0 0.55rem;
  border-left: 1px solid var(--border);
}

.toc-nested li {
  margin-bottom: 0.3rem;
}

.toc li {
  margin-bottom: 0.35rem;
}

.toc a {
  color: var(--muted);
  text-decoration: none;
  border-radius: 4px;
  display: block;
  padding: 0.2rem 0;
  line-height: 1.35;
}

.toc a:hover,
.toc a:focus-visible {
  color: var(--accent);
}

.toc a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

main {
  min-width: 0;
}

.part {
  margin-bottom: 2.5rem;
  scroll-margin-top: 3.75rem;
}

.part.part--hidden {
  display: none;
}

.toc-part.toc-part--hidden {
  display: none;
}

.part-heading {
  margin: 0 0 1.25rem;
  padding: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}

.part > .part-heading + .section {
  margin-top: 0;
}

.part > .section:first-child {
  margin-top: 0;
}

.section {
  margin-bottom: 2.75rem;
  scroll-margin-top: 4rem;
}

.section.section--hidden {
  display: none;
}

.section h2 {
  margin: 0 0 1rem;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.section-body {
  max-width: 50rem;
}

.section-body p {
  margin: 0 0 1rem;
}

.section-body a {
  color: var(--accent);
  word-break: break-word;
}

.section-body ul,
.section-body ol {
  margin: 0 0 1rem;
  padding-left: 1.35rem;
}

.section-body li {
  margin-bottom: 0.35rem;
}

.section-body h3,
.section-body h4 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.section-body pre {
  margin: 0 0 1rem;
  padding: 0.75rem 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
  background: #f4f4f4;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

.section-body code {
  font-size: 0.88em;
  padding: 0.12em 0.35em;
  background: #eee;
  border-radius: 4px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

.section-body pre code {
  padding: 0;
  background: none;
  font-size: inherit;
  white-space: pre-wrap;
  word-break: break-word;
}

.section-body blockquote {
  margin: 0 0 1rem;
  padding-left: 1rem;
  border-left: 3px solid var(--border);
  color: var(--muted);
}

.section-body table {
  margin: 0 0 1rem;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.section-body th,
.section-body td {
  border: 1px solid var(--border);
  padding: 0.35rem 0.6rem;
  text-align: left;
  vertical-align: top;
}

.section-body th {
  background: #f0f0f0;
}

.section-body img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0.75rem 0;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.section-body figure {
  margin: 0 0 1rem;
  max-width: 100%;
}

mark.search-hit {
  background: var(--highlight);
  padding: 0 0.05em;
}

@media (max-width: 51.99rem) {
  .toc {
    position: static;
    top: auto;
    max-height: none;
    overflow-y: visible;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
  }
}