:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --fg: #1a1d26;
  --muted: #5c6578;
  --accent: #2563eb;
  --border: #e2e6ef;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111318;
    --fg: #eef1f7;
    --muted: #9aa3b5;
    --accent: #60a5fa;
    --border: #2a303c;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 94%, var(--fg));
  box-shadow: 0 1px 0 color-mix(in oklab, var(--fg) 4%, transparent);
}

.header-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0.55rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem 1.25rem;
  flex-wrap: wrap;
}

.header-brand {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--fg);
  text-decoration: none;
  flex-shrink: 0;
}

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

.header-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 1rem;
  flex: 1 1 auto;
  justify-content: flex-start;
}

@media (min-width: 960px) {
  .header-nav {
    justify-content: center;
  }
}

.header-nav-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
}

.header-nav-link:hover {
  border-bottom-color: color-mix(in oklab, var(--accent) 45%, transparent);
}

.header-dropdown {
  position: relative;
  margin-left: auto;
  flex-shrink: 0;
}

.header-menu-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.65rem;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--fg);
  background: color-mix(in oklab, var(--bg) 70%, var(--fg));
  border: 1px solid var(--border);
  border-radius: 0.35rem;
  cursor: pointer;
}

.header-menu-btn:hover {
  border-color: color-mix(in oklab, var(--accent) 35%, var(--border));
  color: var(--accent);
}

.header-menu-btn[aria-expanded='true'] {
  border-color: var(--accent);
  color: var(--accent);
}

.header-menu-btn-burger {
  display: block;
  width: 1rem;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  box-shadow: 0 -5px 0 currentColor, 0 5px 0 currentColor;
}

.header-menu-btn-text {
  user-select: none;
}

.header-menu-panel {
  position: absolute;
  top: calc(100% + 0.35rem);
  right: 0;
  min-width: min(18rem, calc(100vw - 2rem));
  padding: 0.35rem 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  box-shadow: 0 4px 6px color-mix(in oklab, var(--fg) 6%, transparent),
    0 12px 28px color-mix(in oklab, var(--fg) 10%, transparent);
}

.header-menu-panel[hidden] {
  display: none !important;
}

.header-menu-panel:not([hidden]) {
  display: block;
}

.header-menu-link {
  display: block;
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
  color: var(--fg);
  text-decoration: none;
  border: 0;
  background: transparent;
  width: 100%;
  text-align: left;
  cursor: pointer;
}

.header-menu-link:hover,
.header-menu-link:focus-visible {
  background: color-mix(in oklab, var(--accent) 10%, transparent);
  outline: none;
}

.main {
  flex: 1;
  max-width: 72rem;
  margin: 0 auto;
  padding: 1.5rem 1rem;
  width: 100%;
}

.footer {
  position: relative;
  z-index: 45;
  margin-top: 2rem;
  border-top: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 94%, var(--fg));
}

.footer-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: 1rem 1rem 1.5rem;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}

.footer-link:hover {
  text-decoration: underline;
}

/* переключатель языка (в хедере и при необходимости в контенте) */
.lang-switch {
  margin: -0.25rem 0 1rem 0;
  font-size: 0.9rem;
}

.header-lang-switch {
  margin: 0;
  flex-shrink: 0;
}

.lang-switch a {
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}

.lang-switch a:hover {
  text-decoration: underline;
}

h1 {
  margin-top: 0;
  font-size: 1.75rem;
}

.lead {
  font-size: 1.1rem;
  color: var(--muted);
}

code {
  font-size: 0.95em;
  padding: 0.1em 0.35em;
  border-radius: 0.25rem;
  background: color-mix(in oklab, var(--fg) 8%, transparent);
}

.list {
  padding-left: 1.25rem;
}

.list li {
  margin: 0.35rem 0;
}

/* контент из ваших README.md (goldmark + ваш HTML) */
.doc-markdown {
  font-size: 1rem;
}

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

.nc-source-file-list {
  padding-left: 1.25rem;
  margin: 0.5rem 0 0;
}

.nc-source-file-list li {
  margin: 0.35rem 0;
}

/*
  Рейл fixed слева от вьюпорта. Хедер/футер не трогаем.
  Когда main уже почти на всю ширину (центровка не даёт зазора под рейл),
  сдвигаем только потоковый блок с article — не меняя padding у .main.
  Порог: примерно 72rem + 2×(ширина рейла + зазор − левый padding main).
*/
@media (max-width: 77.5rem) {
  .nc-source-flow {
    margin-left: max(
      0px,
      calc(env(safe-area-inset-left, 0px) + 3.5rem + 0.25rem - 1rem)
    );
  }
}

/* фиксированная колонка у левого края экрана (как floating control: position fixed + z-index) */
.nc-source-back-rail {
  position: fixed;
  left: env(safe-area-inset-left, 0px);
  top: 0;
  bottom: 0;
  height: auto;
  min-height: 100vh;
  min-height: 100dvh;
  z-index: 40;
  box-sizing: border-box;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  padding: 0;
  color: inherit;
  background: transparent;
  border: none;
  border-radius: 0 0.4rem 0.4rem 0;
  box-shadow: none;
  text-decoration: none;
  transition: color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.nc-source-back-rail:hover {
  color: var(--fg);
  background: color-mix(in oklab, var(--accent) 12%, var(--bg));
  box-shadow: 1px 0 6px color-mix(in oklab, var(--accent) 18%, transparent);
}

.nc-source-back-rail:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  .nc-source-back-rail {
    transition: none;
  }
}

.nc-code-block {
  margin: 1rem 0 0;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.45;
  border: 1px solid var(--border);
  border-radius: 0.35rem;
  background: color-mix(in oklab, var(--fg) 5%, var(--bg));
}

.nc-code-block code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  white-space: pre;
  background: transparent;
  padding: 0;
}

.doc-markdown table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
  font-size: 0.95rem;
}

.doc-markdown th,
.doc-markdown td {
  border: 1px solid var(--border);
  padding: 0.35rem 0.5rem;
}

/* pre: как у roboleary / GitHub-подобных примеров — кнопка снаружи pre, absolute на обёртке = поверх области кода, без отступа над текстом */
.doc-markdown pre {
  overflow: auto;
  padding: 0.75rem 1rem;
  border-radius: 0.35rem;
  background: color-mix(in oklab, var(--fg) 6%, transparent);
}

.doc-markdown .pre-block {
  position: relative;
  margin: 1rem 0;
}

.doc-markdown .pre-block pre {
  margin: 0;
}

/* иконки поверх блока (toolbar — sibling pre) */
.doc-markdown .pre-block-toolbar {
  position: absolute;
  top: 0.4rem;
  right: 0.4rem;
  z-index: 5;
  display: flex;
  gap: 0.35rem;
}

.doc-markdown .pre-block-toolbar .copy-code-btn,
.doc-markdown .pre-block-toolbar .download-code-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  margin: 0;
  color: var(--muted);
  background: color-mix(in oklab, var(--bg) 88%, var(--fg));
  border: 1px solid var(--border);
  border-radius: 0.35rem;
  box-shadow: 0 1px 2px color-mix(in oklab, var(--fg) 8%, transparent);
  cursor: pointer;
  opacity: 0.88;
  transition: opacity 0.15s ease, color 0.15s ease, border-color 0.15s ease,
    background 0.15s ease;
}

@media (hover: hover) {
  .doc-markdown .pre-block-toolbar .copy-code-btn,
  .doc-markdown .pre-block-toolbar .download-code-btn {
    opacity: 0.62;
  }

  .doc-markdown .pre-block:hover .pre-block-toolbar .copy-code-btn,
  .doc-markdown .pre-block:hover .pre-block-toolbar .download-code-btn {
    opacity: 1;
  }
}

.doc-markdown .pre-block-toolbar .copy-code-btn:hover,
.doc-markdown .pre-block-toolbar .download-code-btn:hover {
  color: var(--fg);
  border-color: color-mix(in oklab, var(--accent) 35%, var(--border));
}

.doc-markdown .pre-block-toolbar .copy-code-btn:active,
.doc-markdown .pre-block-toolbar .download-code-btn:active {
  transform: scale(0.96);
}

.doc-markdown .copy-code-btn--copied {
  opacity: 1 !important;
  color: #16a34a;
  border-color: color-mix(in oklab, #16a34a 45%, var(--border));
  background: color-mix(in oklab, #16a34a 12%, var(--bg));
}

@media (prefers-color-scheme: dark) {
  .doc-markdown .copy-code-btn--copied {
    color: #4ade80;
    border-color: color-mix(in oklab, #4ade80 40%, var(--border));
    background: color-mix(in oklab, #4ade80 14%, var(--bg));
  }
}

/* только контейнер pre с фоном; внутри code без второго фона */
.doc-markdown pre code {
  background: transparent;
  padding: 0;
  border-radius: 0;
  font-size: 0.9em;
  line-height: 1.45;
}

.doc-markdown blockquote {
  margin: 0.75rem 0;
  padding-left: 1rem;
  border-left: 3px solid var(--border);
  color: var(--muted);
}

/* GitHub-style [!NOTE] / [!WARNING] → aside (обрабатывает admonitions.js) */
.admonition {
  margin: 1rem 0;
  padding: 0.65rem 1rem 0.85rem 1rem;
  border-left: 4px solid var(--admon-accent);
  background: transparent;
}

.admonition-note {
  --admon-accent: #0969da;
  --admon-title: #0969da;
}

.admonition-warning {
  --admon-accent: #9a6700;
  --admon-title: #9a6700;
}

.admonition-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.55rem;
  color: var(--admon-title);
  font-size: 0.95rem;
  line-height: 1.3;
}

.admonition-title strong {
  font-weight: 600;
}

.admonition-svg {
  flex-shrink: 0;
  display: block;
  color: var(--admon-title);
}

.admonition-content {
  color: var(--fg);
  font-size: 1rem;
}

.admonition-content > :first-child {
  margin-top: 0;
}

.admonition-content > :last-child {
  margin-bottom: 0;
}

.admonition-content p {
  margin: 0.4rem 0 0 0;
}

@media (prefers-color-scheme: dark) {
  .admonition-note {
    --admon-accent: #4493f8;
    --admon-title: #6cb6ff;
  }

  .admonition-warning {
    --admon-accent: #c69026;
    --admon-title: #d4a72c;
  }
}