:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-muted: #666666;
  --color-border: #e5e7eb;
  --color-accent: #0055cc;
  --color-accent-hover: #003d99;
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --max-width: 760px;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-base);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

a {
  color: var(--color-accent);
}

header {
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 1.5rem;
}

header .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

header a.logo {
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--color-text);
  text-decoration: none;
}

header a.logo:hover {
  color: var(--color-accent);
}

.language-switch {
  display: inline-flex;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  overflow: hidden;
  background: #f8f9fa;
}

.language-switch__active,
.language-switch__item {
  padding: 0.375rem 0.875rem;
  font-size: 0.875rem;
  text-decoration: none;
  color: var(--color-text);
  transition: background 0.15s ease, color 0.15s ease;
}

.language-switch__active {
  background: var(--color-accent);
  color: #fff;
}

.language-switch__item:hover {
  background: #fff;
  color: var(--color-accent);
}

.language-switch__active:focus-visible,
.language-switch__item:focus-visible,
.sidebar__toggle:focus-visible + .sidebar__hamburger {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.page-header {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 2rem;
}

.page-header h1 {
  font-size: 2.25rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.page-header p {
  color: var(--color-muted);
  margin: 0;
  font-size: 1.0625rem;
}

.topic-section-minimal {
  margin-bottom: 2.5rem;
}

.topic-section-minimal h2 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  margin: 0 0 1rem;
}

.article-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.article-index__link {
  display: block;
  padding: 0.875rem 1rem;
  border-radius: 0.5rem;
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: background 0.15s ease, color 0.15s ease, padding 0.15s ease;
}

.article-index__link:hover {
  background: #f4f6f8;
  color: var(--color-accent);
  padding-left: 1.25rem;
}

footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 1.5rem;
  color: var(--color-muted);
  font-size: 0.875rem;
  text-align: center;
}

footer .inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

footer a {
  color: var(--color-muted);
  text-decoration: none;
}

footer a:hover {
  color: var(--color-accent);
}

.doc-main {
  max-width: 1200px;
}

.doc-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 3rem;
  align-items: start;
}

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

.sidebar {
  position: sticky;
  top: 2rem;
  border-right: 1px solid var(--color-border);
  padding-right: 1.5rem;
}

.sidebar__toggle {
  display: none;
}

.sidebar__hamburger {
  display: none;
  cursor: pointer;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
  margin-bottom: 1rem;
  color: var(--color-text);
  font-weight: 500;
  border-radius: 0.25rem;
}

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

.sidebar__hamburger-icon {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  width: 1.5rem;
}

.sidebar__hamburger-icon span {
  display: block;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}

.sidebar__language-switch {
  display: none;
  margin-bottom: 1.5rem;
}

.language-switch__header {
  display: block;
}

.sidebar__group {
  margin-bottom: 1.5rem;
}

.sidebar__group h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  margin: 0 0 0.75rem;
}

.sidebar__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.25rem;
}

.sidebar__link {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: 0.375rem;
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: background 0.15s ease, color 0.15s ease;
}

.sidebar__link:hover {
  background: #f4f6f8;
  color: var(--color-accent);
}

.sidebar__link--active {
  background: #eef4ff;
  color: var(--color-accent);
  font-weight: 500;
}

@media (max-width: 768px) {
  .doc-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .sidebar {
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding-right: 0;
    padding-bottom: 1.5rem;
  }

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

  .sidebar__hamburger {
    display: inline-flex;
    margin-top: 0;
    margin-bottom: 0.5rem;
  }

  .sidebar__content {
    display: none;
  }

  .sidebar__toggle:checked ~ .sidebar__content {
    display: block;
  }

  .language-switch__header {
    display: none;
  }

  .sidebar__language-switch {
    display: block;
  }
}

.markdown h1,
.markdown h2,
.markdown h3,
.markdown h4 {
  margin-top: 2rem;
  margin-bottom: 1rem;
  line-height: 1.25;
}

.markdown h1 {
  font-size: 2rem;
  margin-top: 0;
}

.markdown h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.25rem;
}

.markdown p {
  margin: 0 0 1rem;
}

.markdown ul,
.markdown ol {
  margin: 0 0 1rem 1.25rem;
  padding: 0;
}

.markdown li {
  margin-bottom: 0.25rem;
}

.markdown a {
  color: var(--color-accent);
  text-decoration: underline;
}

.markdown a:hover {
  color: var(--color-accent-hover);
}

.markdown code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: #f4f4f5;
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
}

.markdown pre {
  background: #f4f4f5;
  padding: 1rem;
  border-radius: 0.5rem;
  overflow-x: auto;
  margin: 0 0 1rem;
}

.markdown pre code {
  background: transparent;
  padding: 0;
}

.markdown blockquote {
  border-left: 4px solid var(--color-accent);
  margin: 0 0 1rem;
  padding: 0.5rem 1rem;
  background: #f9f9fb;
  color: var(--color-muted);
}

.markdown img {
  max-width: 100%;
  height: auto;
}

.markdown table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
}

.markdown th,
.markdown td {
  border: 1px solid var(--color-border);
  padding: 0.5rem;
  text-align: left;
}

.markdown th {
  background: #f9f9fb;
}