:root {
  color-scheme: light;
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-muted: #f7f7f5;
  --surface-active: #f1f0eb;
  --text: #3d3929;
  --text-strong: #1f1d16;
  --muted: #777367;
  --line: #e6e2d9;
  --line-strong: #d9d3c7;
  --accent: #8b5e34;
  --accent-dark: #6f4a29;
  --danger: #b45309;
  --code-bg: #24211b;
  --code-text: #f8f4ea;
  --radius: 8px;
  --sidebar-width: 304px;
  --toc-width: 236px;
  --content-width: 820px;
  --page-width: calc(var(--content-width) + var(--toc-width) + 64px);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #191713;
  --surface: #1f1d18;
  --surface-muted: #29261f;
  --surface-active: #332f27;
  --text: #ded8cc;
  --text-strong: #f7f1e6;
  --muted: #aaa296;
  --line: #39352c;
  --line-strong: #4b4539;
  --accent: #d6a869;
  --accent-dark: #e8bf81;
  --danger: #f0b35f;
  --code-bg: #0f1115;
  --code-text: #f7f1e6;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Microsoft YaHei",
    sans-serif;
  font-size: 15px;
  line-height: 1.65;
}

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

button,
input,
textarea {
  font: inherit;
}

.shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  border-right: 1px solid var(--line);
  background: var(--surface);
  padding: 18px 14px 28px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 2px 6px 16px;
  border-bottom: 1px solid var(--line);
}

.brand-mark {
  display: block;
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  border-radius: 7px;
  box-shadow: 0 1px 0 rgba(16, 24, 40, 0.08);
}

.brand strong {
  display: block;
  color: var(--text-strong);
  font-size: 14px;
  line-height: 1.2;
}

.brand span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-top: 2px;
}

.repo-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-muted);
  margin: 14px 2px 4px;
  padding: 10px 11px;
}

.repo-card a {
  color: var(--text-strong);
  display: block;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.35;
  text-decoration: none;
  overflow-wrap: anywhere;
}

.repo-card a:hover {
  color: var(--accent-dark);
}

.repo-card span {
  color: var(--muted);
  display: block;
  font-size: 11px;
  line-height: 1.35;
  margin-top: 3px;
}

.doc-nav {
  display: grid;
  gap: 4px;
  margin-top: 14px;
}

.nav-group {
  border-radius: var(--radius);
}

.nav-item,
.section-item {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  text-align: left;
}

.nav-item {
  display: grid;
  gap: 2px;
  padding: 9px 10px;
  border-radius: var(--radius);
}

.nav-item strong {
  color: var(--text-strong);
  font-size: 13px;
  font-weight: 650;
}

.nav-item span {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.35;
}

.nav-item:hover,
.nav-item.active {
  background: var(--surface-muted);
}

.section-list {
  display: none;
  margin: 2px 0 8px 12px;
  padding-left: 10px;
  border-left: 1px solid var(--line);
}

.nav-group.open .section-list {
  display: grid;
}

.section-item {
  border-radius: 6px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
  padding: 7px 8px;
}

.section-item:hover {
  color: var(--text-strong);
  background: var(--surface-muted);
}

.section-item.active {
  color: var(--accent-dark);
  background: var(--surface-active);
  font-weight: 650;
}

.section-title {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.main {
  min-width: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 64px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(14px);
  padding: 0 32px;
}

.topbar-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: var(--page-width);
  width: 100%;
  height: 100%;
  margin: 0 auto;
}

.icon-button {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  width: 38px;
  height: 38px;
  border-radius: var(--radius);
}

.theme-button {
  flex: 0 0 auto;
  font-size: 16px;
}

.menu-button {
  display: none;
  place-items: center;
  gap: 4px;
  padding: 9px;
}

.menu-button span {
  display: block;
  width: 17px;
  height: 2px;
  background: var(--text);
}

.search {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1 1 auto;
  min-width: 240px;
  max-width: 620px;
  min-height: 40px;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: 8px 12px;
  border-radius: var(--radius);
}

.search:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

.search span {
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

.search input {
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
}

.top-link,
.primary-button,
.secondary-button {
  align-items: center;
  border-radius: var(--radius);
  display: inline-flex;
  min-height: 38px;
  justify-content: center;
  padding: 8px 12px;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  font-size: 13px;
  font-weight: 600;
}

.top-link,
.primary-button {
  border: 1px solid var(--accent-dark);
  background: var(--accent-dark);
  color: #fff;
}

:root[data-theme="dark"] .top-link,
:root[data-theme="dark"] .primary-button {
  color: #191713;
}

.secondary-button {
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--text-strong);
}

.top-github {
  flex: 0 0 auto;
}

.top-github::before {
  content: "";
  width: 14px;
  height: 14px;
  margin-right: 7px;
  background: currentColor;
  clip-path: path("M7 .7a6.3 6.3 0 0 0-2 12.27c.31.06.43-.13.43-.3v-1.1c-1.76.38-2.13-.75-2.13-.75-.29-.73-.7-.92-.7-.92-.57-.39.04-.38.04-.38.63.04.96.65.96.65.56.95 1.47.68 1.83.52.06-.4.22-.68.4-.84-1.4-.16-2.87-.7-2.87-3.13 0-.69.25-1.25.65-1.69-.07-.16-.28-.8.06-1.67 0 0 .53-.17 1.73.64A5.96 5.96 0 0 1 7 3.8c.54 0 1.08.07 1.59.21 1.2-.81 1.73-.64 1.73-.64.34.87.13 1.51.06 1.67.4.44.65 1 .65 1.69 0 2.44-1.48 2.97-2.89 3.13.23.2.43.58.43 1.16v1.72c0 .17.12.36.44.3A6.3 6.3 0 0 0 7 .7Z");
}

.text-button {
  border: 0;
  background: transparent;
  color: var(--accent-dark);
  cursor: pointer;
  padding: 0;
  font-size: 13px;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, var(--content-width)) var(--toc-width);
  gap: 64px;
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 38px 32px 72px;
}

.document {
  min-width: 0;
}

.doc-meta {
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 30px;
}

.breadcrumb,
.section-progress {
  color: var(--muted);
  font-size: 12px;
}

.breadcrumb {
  margin-bottom: 10px;
}

.breadcrumb span,
.breadcrumb code {
  display: inline-block;
  vertical-align: middle;
}

.breadcrumb code {
  background: var(--surface-muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 11px;
  margin-left: 6px;
  max-width: 100%;
  overflow-wrap: anywhere;
  padding: 2px 7px;
}

.section-progress {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.section-progress span {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-muted);
  padding: 3px 8px;
}

.doc-meta h1 {
  margin: 0;
  color: var(--text-strong);
  font-size: clamp(30px, 3.2vw, 42px);
  line-height: 1.16;
  letter-spacing: 0;
}

.doc-meta p {
  max-width: 700px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 15px;
}

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

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
  color: var(--text-strong);
  line-height: 1.28;
  letter-spacing: 0;
  scroll-margin-top: 86px;
}

.article-content h1 {
  margin: 0 0 22px;
  font-size: clamp(26px, 3vw, 34px);
}

.article-content h2 {
  margin: 38px 0 14px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 24px;
}

.article-content h3 {
  margin: 30px 0 10px;
  font-size: 19px;
}

.article-content h4 {
  margin: 24px 0 8px;
  font-size: 16px;
}

.article-content p,
.article-content li {
  font-size: 15px;
  line-height: 1.78;
}

.article-content p {
  margin: 12px 0;
}

.article-content ul,
.article-content ol {
  padding-left: 23px;
}

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

.article-content blockquote {
  border-left: 3px solid var(--accent);
  margin: 20px 0;
  padding: 8px 14px;
  background: var(--surface-muted);
  color: var(--muted);
}

.article-content code {
  background: var(--surface-muted);
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--text-strong);
  padding: 2px 5px;
  font-family: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  font-size: 0.9em;
}

.code-block {
  position: relative;
  margin: 20px 0;
}

.article-content .code-block pre {
  margin: 0;
}

.code-copy {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 1;
  border: 1px solid color-mix(in srgb, var(--code-text) 18%, transparent);
  border-radius: 6px;
  background: color-mix(in srgb, var(--code-bg) 72%, var(--code-text));
  color: var(--code-text);
  cursor: pointer;
  font-size: 12px;
  font-weight: 650;
  line-height: 1;
  min-height: 28px;
  padding: 7px 9px;
}

.code-copy:hover {
  border-color: color-mix(in srgb, var(--code-text) 36%, transparent);
  background: color-mix(in srgb, var(--code-bg) 58%, var(--code-text));
}

.code-copy:disabled {
  cursor: default;
  opacity: 0.72;
}

.article-content pre {
  overflow: auto;
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: var(--radius);
  padding: 16px 68px 16px 16px;
  line-height: 1.6;
}

.article-content pre code {
  background: transparent;
  border: 0;
  color: inherit;
  padding: 0;
}

.article-content table {
  border-collapse: collapse;
  display: block;
  overflow-x: auto;
  width: 100%;
  margin: 20px 0;
  font-size: 14px;
}

.article-content th,
.article-content td {
  border: 1px solid var(--line);
  padding: 9px 11px;
  text-align: left;
  vertical-align: top;
}

.article-content th {
  background: var(--surface-muted);
  color: var(--text-strong);
  font-weight: 650;
}

.section-pager {
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 14px;
  margin-top: 42px;
  padding-top: 22px;
}

.pager-card {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: var(--radius);
  color: var(--text);
  cursor: pointer;
  min-height: 72px;
  padding: 13px;
  text-align: left;
}

.pager-card:hover {
  border-color: var(--accent);
  background: var(--surface-active);
}

.pager-card.next {
  text-align: right;
}

.pager-card span {
  color: var(--muted);
  display: block;
  font-size: 12px;
  margin-bottom: 5px;
}

.pager-card strong {
  display: block;
  color: var(--text-strong);
  line-height: 1.35;
}

.toc {
  position: sticky;
  top: 90px;
  align-self: start;
  border-left: 1px solid var(--line);
  padding-left: 16px;
  max-height: calc(100vh - 110px);
  overflow: auto;
}

.toc-title {
  color: var(--muted);
  font-size: 12px;
  font-weight: 650;
  margin-bottom: 10px;
}

.toc button {
  display: block;
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 12px;
  line-height: 1.45;
  padding: 5px 0;
  text-align: left;
  text-decoration: none;
}

.toc button:hover {
  color: var(--accent-dark);
}

.toc .toc-h3 {
  padding-left: 12px;
}

.search-results {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 8px);
  z-index: 35;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: 0 18px 44px rgba(17, 24, 39, 0.14);
  max-height: min(540px, calc(100vh - 92px));
  overflow: auto;
  padding: 8px;
}

:root[data-theme="dark"] .search-results {
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.35);
}

.search-results-head {
  align-items: center;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  display: flex;
  font-size: 12px;
  justify-content: space-between;
  margin: 0 4px 4px;
  padding: 4px 2px 8px;
}

.search-results-head strong {
  background: var(--surface-muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text-strong);
  font-size: 11px;
  min-width: 24px;
  padding: 1px 7px;
  text-align: center;
}

.result-item {
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  padding: 10px;
}

.result-item:hover {
  background: var(--surface-muted);
  border-color: var(--line);
}

.result-item strong {
  color: var(--text-strong);
  display: block;
}

.result-source {
  color: var(--muted);
  display: block;
  font-size: 11px;
  line-height: 1.35;
  margin-top: 2px;
  overflow-wrap: anywhere;
}

.result-item p {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
  margin: 4px 0 0;
}

.result-item mark {
  background: color-mix(in srgb, var(--accent) 22%, transparent);
  border-radius: 3px;
  color: var(--text-strong);
  padding: 0 2px;
}

.search-empty {
  display: grid;
  gap: 4px;
  padding: 18px 12px;
  text-align: center;
}

.search-empty strong {
  color: var(--text-strong);
  font-size: 14px;
}

.search-empty span {
  color: var(--muted);
  font-size: 12px;
}

.feedback {
  border-top: 1px solid var(--line);
  margin-top: 46px;
  padding-top: 24px;
  max-width: 100%;
}

.feedback-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.comments-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.eyebrow {
  color: var(--danger);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin: 0 0 4px;
}

.feedback h2 {
  color: var(--text-strong);
  font-size: 20px;
  margin: 0;
}

.feedback-heading p:not(.eyebrow) {
  color: var(--muted);
  font-size: 14px;
  margin: 4px 0 0;
}

.feedback h3 {
  color: var(--text-strong);
  font-size: 16px;
  margin: 0;
}

.feedback-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 88%, var(--surface-muted));
  margin-top: 18px;
  padding: 14px;
}

.feedback-main {
  min-width: 0;
}

.feedback-form {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.feedback-row {
  align-items: end;
  display: grid;
  grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
  gap: 14px;
}

.feedback-note {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
  padding-bottom: 9px;
}

.feedback-form label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

.feedback-form select,
.feedback-form input,
.feedback-form textarea {
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--text);
  border-radius: var(--radius);
  padding: 10px 11px;
  resize: vertical;
}

.feedback-form select:focus,
.feedback-form input:focus,
.feedback-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}

.feedback-actions {
  border-top: 1px solid var(--line);
  padding-top: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  align-items: center;
}

.feedback-actions > * {
  flex: 0 1 auto;
}

.issue-list {
  border-top: 1px solid var(--line);
  margin-top: 16px;
  padding-top: 14px;
}

.issue-list-body {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.issue-item {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: var(--radius);
  padding: 13px;
}

.issue-item {
  display: grid;
  gap: 3px;
  text-decoration: none;
}

.issue-item:hover {
  border-color: var(--accent);
  background: var(--surface-active);
}

.issue-item span {
  color: var(--muted);
  font-size: 12px;
}

.issue-item strong {
  color: var(--text-strong);
  font-size: 14px;
  line-height: 1.4;
}

.empty {
  color: var(--muted);
  margin: 0;
}

.feedback-footnote {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
  margin: 14px -14px -14px;
  padding: 10px 14px;
  background: var(--surface-muted);
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  transform: translateY(120px);
  transition: transform 160ms ease;
  background: var(--text-strong);
  color: #fff;
  border-radius: var(--radius);
  padding: 11px 13px;
  z-index: 50;
}

.toast.show {
  transform: translateY(0);
}

@media (max-width: 1120px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    z-index: 40;
    transform: translateX(-100%);
    transition: transform 180ms ease;
    width: var(--sidebar-width);
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: 0 20px 60px rgba(17, 24, 39, 0.18);
  }

  .menu-button {
    display: grid;
  }

  .content-grid {
    grid-template-columns: minmax(0, var(--content-width));
    justify-content: center;
  }

  .toc {
    position: static;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding: 16px 0 0;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 14px;
  }

  .topbar {
    height: auto;
    padding: 10px;
  }

  .topbar-inner {
    width: 100%;
    gap: 8px;
  }

  .top-link {
    display: none;
  }

  .top-github {
    display: none;
  }

  .theme-button {
    width: 40px;
  }

  .search {
    min-width: 0;
  }

  .search-results {
    left: -48px;
    right: -48px;
    max-height: calc(100vh - 78px);
  }

  .content-grid {
    padding: 22px 16px 54px;
  }

  .doc-meta h1 {
    font-size: 30px;
  }

  .section-pager,
  .feedback-heading,
  .feedback-row {
    grid-template-columns: 1fr;
    display: grid;
  }

  .feedback-heading .secondary-button {
    width: 100%;
  }

  .feedback-note {
    padding-bottom: 0;
  }
}