:root {
  --sidebar-width: 286px;
  --sidebar-bg: #f7f7f8;
  --sidebar-hover: #ececf1;
  --sidebar-active: #e3e3e8;
  --sidebar-text: #202123;
  --sidebar-muted: #6e6e80;
  --page-bg: #ffffff;
  --surface: #f6f8fa;
  --surface-strong: #eef1f4;
  --border: #d8dee4;
  --border-soft: #e5e7eb;
  --text: #24292f;
  --muted: #656d76;
  --accent: #10a37f;
  --link: #0969da;
  --code-bg: #f6f8fa;
  --code-border: #d0d7de;
  --content-width: 860px;
  --shadow: 0 8px 24px rgba(140, 149, 159, 0.16);
  --focus-ring: 0 0 0 3px rgba(9, 105, 218, 0.18);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  overflow: hidden;
  background: var(--page-bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
}

button,
a {
  font: inherit;
}

button {
  color: inherit;
}

.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  position: relative;
  z-index: 30;
  display: flex;
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  flex-direction: column;
  border-right: 1px solid var(--border-soft);
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
}

.sidebar__header {
  display: flex;
  min-height: 72px;
  align-items: center;
  gap: 12px;
  padding: 14px 14px 12px;
  border-bottom: 1px solid var(--border-soft);
}

.brand {
  display: flex;
  min-width: 0;
  flex: 1;
  align-items: center;
  gap: 11px;
  color: inherit;
  text-decoration: none;
}

.brand__mark {
  display: grid;
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  place-items: center;
  border: 1px solid rgba(16, 163, 127, 0.28);
  border-radius: 11px;
  background: #ffffff;
  color: var(--accent);
  box-shadow: 0 1px 2px rgba(31, 35, 40, 0.08);
  font-weight: 800;
}

.brand__text {
  display: flex;
  min-width: 0;
  flex-direction: column;
  line-height: 1.25;
}

.brand__text strong,
.brand__text small {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand__text strong {
  font-size: 14px;
}

.brand__text small {
  margin-top: 4px;
  color: var(--sidebar-muted);
  font-size: 11px;
}

.icon-button {
  display: inline-grid;
  width: 40px;
  height: 40px;
  flex: 0 0 40px;
  cursor: pointer;
  place-items: center;
  border: 0;
  border-radius: 9px;
  background: transparent;
}

.icon-button:hover,
.icon-button:focus-visible {
  background: var(--sidebar-hover);
  outline: none;
}

.icon-button:focus-visible {
  box-shadow: var(--focus-ring);
}

.sidebar__close,
.menu-button {
  display: none;
}

.doc-nav {
  flex: 1;
  overflow-y: auto;
  padding: 14px 10px 24px;
  scrollbar-color: #c7c7cc transparent;
  scrollbar-width: thin;
}

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

.nav-group__toggle {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 10px;
  cursor: pointer;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--sidebar-muted);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.035em;
  text-align: left;
}

.nav-group__toggle:hover,
.nav-group__toggle:focus-visible {
  background: var(--sidebar-hover);
  color: var(--sidebar-text);
  outline: none;
}

.nav-group__toggle:focus-visible {
  box-shadow: var(--focus-ring);
}

.nav-group__label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-group__chevron {
  width: 7px;
  height: 7px;
  flex: 0 0 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform 160ms ease;
}

.nav-group.is-collapsed .nav-group__chevron {
  transform: rotate(-45deg) translate(-1px, -1px);
}

.nav-group__content {
  display: grid;
  grid-template-rows: 1fr;
  opacity: 1;
  transition: grid-template-rows 180ms ease, opacity 160ms ease;
}

.nav-group.is-collapsed .nav-group__content {
  grid-template-rows: 0fr;
  opacity: 0;
}

.nav-group__content-inner {
  min-height: 0;
  overflow: hidden;
}

.nav-list {
  display: grid;
  gap: 3px;
  margin: 0;
  padding: 1px 0 4px;
  list-style: none;
}

.nav-item button {
  display: block;
  width: 100%;
  overflow: hidden;
  padding: 9px 12px 9px 27px;
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: #343541;
  font-size: 14px;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.nav-item button:hover,
.nav-item button:focus-visible {
  background: var(--sidebar-hover);
  color: #202123;
  outline: none;
}

.nav-item button:focus-visible {
  box-shadow: var(--focus-ring);
}

.nav-item button.is-active {
  border-color: #d9d9df;
  background: var(--sidebar-active);
  color: #202123;
  font-weight: 600;
}

.nav-loading,
.nav-error {
  padding: 12px;
  color: var(--sidebar-muted);
  font-size: 13px;
}

.sidebar__footer {
  padding: 13px 18px 16px;
  border-top: 1px solid var(--border-soft);
  color: var(--sidebar-muted);
  font-size: 11px;
}

.sidebar-overlay {
  display: none;
}

.main-panel {
  display: flex;
  min-width: 0;
  height: 100vh;
  flex: 1;
  flex-direction: column;
  background: var(--page-bg);
}

.topbar {
  display: flex;
  min-height: 64px;
  align-items: center;
  gap: 12px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border-soft);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
}

.topbar__titles {
  display: flex;
  min-width: 0;
  flex-direction: column;
  line-height: 1.25;
}

.topbar__category {
  color: var(--muted);
  font-size: 11px;
}

.topbar__title {
  overflow: hidden;
  max-width: min(70vw, 720px);
  margin-top: 3px;
  color: #1f2328;
  font-size: 14px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.content-scroll {
  flex: 1;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-color: #c7c7cc transparent;
  scrollbar-width: thin;
}

.markdown-body {
  width: min(calc(100% - 48px), var(--content-width));
  min-height: calc(100vh - 64px);
  margin: 0 auto;
  padding: 54px 0 96px;
  overflow-wrap: anywhere;
  color: var(--text);
  font-size: 16px;
}

.markdown-body > :first-child {
  margin-top: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  color: #1f2328;
  line-height: 1.3;
  scroll-margin-top: 84px;
}

.markdown-body h1 {
  margin: 0 0 28px;
  font-size: clamp(30px, 5vw, 42px);
  letter-spacing: -0.025em;
}

.markdown-body h2 {
  margin: 44px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-soft);
  font-size: 25px;
}

.markdown-body h3 {
  margin: 32px 0 12px;
  font-size: 20px;
}

.markdown-body h4 {
  margin: 26px 0 10px;
  font-size: 17px;
}

.markdown-body p,
.markdown-body ul,
.markdown-body ol,
.markdown-body blockquote,
.markdown-body table,
.markdown-body pre {
  margin-top: 0;
  margin-bottom: 20px;
}

.markdown-body ul,
.markdown-body ol {
  padding-left: 1.6em;
}

.markdown-body li + li {
  margin-top: 5px;
}

.markdown-body a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.markdown-body a:hover {
  text-decoration-thickness: 2px;
}

.markdown-body blockquote {
  margin-left: 0;
  padding: 10px 16px;
  border-left: 4px solid #d0d7de;
  border-radius: 0 6px 6px 0;
  background: #f6f8fa;
  color: var(--muted);
}

.markdown-body blockquote > :first-child {
  margin-top: 0;
}

.markdown-body blockquote > :last-child,
.markdown-body blockquote p {
  margin-bottom: 0;
}

.markdown-body code:not(pre code) {
  padding: 0.16em 0.38em;
  border-radius: 5px;
  background: rgba(175, 184, 193, 0.2);
  color: #24292f;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.88em;
}

.code-block {
  position: relative;
  margin: 0 0 22px;
}

.code-block pre {
  overflow-x: auto;
  margin: 0;
  padding: 44px 18px 18px;
  border: 1px solid var(--code-border);
  border-radius: 8px;
  background: var(--code-bg);
  box-shadow: none;
}

.code-block pre code {
  padding: 0;
  background: transparent;
  color: #24292f;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 13px;
  line-height: 1.7;
}

.copy-code {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 2;
  padding: 5px 10px;
  cursor: pointer;
  border: 1px solid var(--code-border);
  border-radius: 6px;
  background: #ffffff;
  color: #57606a;
  box-shadow: 0 1px 0 rgba(31, 35, 40, 0.04);
  font-size: 11px;
}

.copy-code:hover,
.copy-code:focus-visible {
  border-color: #b6bec8;
  background: #f3f4f6;
  color: #24292f;
  outline: none;
}

.copy-code:focus-visible {
  box-shadow: var(--focus-ring);
}

.table-wrap {
  overflow-x: auto;
  margin-bottom: 22px;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.markdown-body table {
  width: 100%;
  min-width: 520px;
  margin: 0;
  border-collapse: collapse;
}

.markdown-body th,
.markdown-body td {
  padding: 10px 13px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.markdown-body th {
  background: var(--surface);
  font-weight: 650;
}

.markdown-body tr:nth-child(even) td {
  background: #fbfcfd;
}

.markdown-body tr:last-child td {
  border-bottom: 0;
}

.markdown-body img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 24px auto;
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.markdown-body hr {
  margin: 38px 0;
  border: 0;
  border-top: 1px solid var(--border-soft);
}

.state-card {
  max-width: 620px;
  margin: 10vh auto 0;
  padding: 40px;
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  background: #ffffff;
  box-shadow: 0 1px 3px rgba(31, 35, 40, 0.06);
  text-align: center;
}

.state-card h1 {
  margin-bottom: 10px;
  font-size: 26px;
}

.state-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.state-card__spinner {
  width: 30px;
  height: 30px;
  margin: 0 auto 18px;
  border: 3px solid #d8dee4;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.error-details {
  display: block;
  margin-top: 10px;
  color: #cf222e;
  font-family: monospace;
  font-size: 12px;
}

.noscript-message {
  position: fixed;
  inset: 20px;
  z-index: 100;
  display: grid;
  place-items: center;
  border: 1px solid #d4a72c;
  border-radius: 10px;
  background: #fff8c5;
  color: #633c01;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (max-width: 820px) {
  body {
    overflow: hidden;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(86vw, var(--sidebar-width));
    min-width: 0;
    transform: translateX(-102%);
    box-shadow: 12px 0 35px rgba(31, 35, 40, 0.18);
    transition: transform 180ms ease;
  }

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

  .sidebar__close,
  .menu-button {
    display: inline-grid;
  }

  .sidebar-overlay {
    position: fixed;
    inset: 0;
    z-index: 20;
    display: block;
    visibility: hidden;
    cursor: pointer;
    border: 0;
    background: rgba(31, 35, 40, 0.38);
    opacity: 0;
    transition: opacity 180ms ease, visibility 180ms ease;
  }

  body.sidebar-open .sidebar-overlay {
    visibility: visible;
    opacity: 1;
  }

  .topbar {
    padding: 0 14px;
  }

  .markdown-body {
    width: min(calc(100% - 32px), var(--content-width));
    padding-top: 36px;
  }
}

@media (max-width: 520px) {
  .topbar__category {
    display: none;
  }

  .topbar__title {
    margin-top: 0;
  }

  .markdown-body {
    width: min(calc(100% - 28px), var(--content-width));
    padding-bottom: 64px;
    font-size: 15px;
  }

  .markdown-body h1 {
    font-size: 30px;
  }

  .markdown-body h2 {
    margin-top: 38px;
    font-size: 23px;
  }

  .state-card {
    margin-top: 5vh;
    padding: 30px 20px;
  }
}