:root {
  --bg: #ffffff;
  --fg: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --sidebar-bg: #fafafa;
  --code-bg: #f8fafc;
  --link: #0f766e;
  --link-hover: #115e59;
  --focus: #2563eb;

  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New",
    "Noto Sans Mono CJK SC", monospace;

  --sidebar-w: 320px;
  --content-max: 880px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --fg: #e5e7eb;
    --muted: #94a3b8;
    --border: #1f2a3a;
    --sidebar-bg: #0f172a;
    --code-bg: #0b1629;
    --link: #2dd4bf;
    --link-hover: #5eead4;
    --focus: #60a5fa;
  }
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --fg: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --sidebar-bg: #fafafa;
  --code-bg: #f8fafc;
  --link: #0f766e;
  --link-hover: #115e59;
  --focus: #2563eb;
}

:root[data-theme="dark"] {
  --bg: #0b1220;
  --fg: #e5e7eb;
  --muted: #94a3b8;
  --border: #1f2a3a;
  --sidebar-bg: #0f172a;
  --code-bg: #0b1629;
  --link: #2dd4bf;
  --link-hover: #5eead4;
  --focus: #60a5fa;
}

* {
  box-sizing: border-box;
}

html {
  overflow-x: hidden;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: hidden;
}

.topbar {
  display: none;
}

.toc-backdrop {
  display: none;
}

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, var(--content-max)) 1fr;
  min-height: 100vh;
}

@media (min-width: 901px) {
  html,
  body {
    height: 100%;
    overflow: hidden;
  }

  .layout {
    height: 100vh;
  }

  .sidebar {
    height: 100vh;
  }

  .sidebar-inner {
    position: relative;
    top: auto;
    max-height: none;
    height: 100%;
  }

  .sidebar-header {
    position: sticky;
    top: 0;
    margin: -22px -16px 14px;
    padding: 22px 16px 14px;
    background: var(--sidebar-bg);
    border-bottom: 1px solid var(--border);
    z-index: 1;
  }

  .main {
    grid-column: 2 / -1;
    height: 100vh;
    overflow: auto;
  }

  .spacer {
    display: none;
  }

  .doc {
    max-width: var(--content-max);
    margin-right: auto;
  }
}

.sidebar {
  border-right: 1px solid var(--border);
  background: var(--sidebar-bg);
}

.sidebar-inner {
  position: sticky;
  top: 0;
  max-height: 100vh;
  overflow: auto;
  padding: 22px 16px;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}

.sidebar-header .brand {
  margin-bottom: 0;
}

.icon-button {
  appearance: none;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--border) 16%, transparent);
  color: var(--fg);
  text-decoration: none;
  border-radius: 12px;
  width: 40px;
  height: 40px;
  padding: 0;
  display: inline-grid;
  place-items: center;
  cursor: pointer;
}

.icon-button:hover {
  border-color: color-mix(in oklab, var(--focus) 35%, var(--border));
  color: var(--fg);
}

.icon-button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--focus) 35%, transparent);
}

.icon {
  width: 20px;
  height: 20px;
  display: block;
}

.theme-icon {
  display: none;
}

:root[data-theme="light"] .theme-icon--sun {
  display: block;
}

:root[data-theme="dark"] .theme-icon--moon {
  display: block;
}

.toc-toggle {
  appearance: none;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--border) 16%, transparent);
  color: var(--fg);
  border-radius: 999px;
  padding: 8px 12px;
  font: inherit;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
}

.toc-toggle:hover {
  border-color: color-mix(in oklab, var(--focus) 35%, var(--border));
}

.toc-toggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--focus) 35%, transparent);
}

.brand {
  display: inline-block;
  font-weight: 700;
  letter-spacing: 0.2px;
  margin-bottom: 14px;
  color: var(--fg);
  text-decoration: none;
}

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

.muted {
  color: var(--muted);
}

.toc-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 10px 0 8px;
}

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

.toc li {
  margin: 2px 0;
}

.toc ul ul {
  margin-left: 6px;
  padding-left: 12px;
  border-left: 1px solid var(--border);
}

.toc a {
  display: block;
  padding: 4px 8px;
  border-radius: 8px;
  color: var(--muted);
  text-decoration: none;
  outline: none;
}

.toc a:hover {
  color: var(--fg);
  background: color-mix(in oklab, var(--border) 35%, transparent);
}

.toc a:focus-visible {
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--focus) 35%, transparent);
}

.toc a.is-active {
  color: var(--fg);
  background: color-mix(in oklab, var(--focus) 16%, transparent);
  font-weight: 600;
}

.main {
  padding: 28px 44px 40px;
  min-width: 0;
}

.spacer {
  display: block;
}

.doc {
  min-width: 0;
  overflow-wrap: anywhere;
}

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

h1,
h2,
h3 {
  line-height: 1.25;
  scroll-margin-top: 16px;
}

h1 {
  font-size: 28px;
  margin: 0.2em 0 0.6em;
}

h2 {
  font-size: 22px;
  margin: 1.6em 0 0.6em;
}

h3 {
  font-size: 18px;
  margin: 1.4em 0 0.6em;
}

p {
  margin: 0.9em 0;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--link-hover);
}

code {
  font-family: var(--font-mono);
  font-size: 0.95em;
  background: var(--code-bg);
  padding: 0.14em 0.34em;
  border-radius: 8px;
  overflow-wrap: anywhere;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  overflow: auto;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}

pre code {
  background: transparent;
  padding: 0;
  border-radius: 0;
}

.code-block {
  position: relative;
}

.code-block pre {
  padding-right: 56px;
}

.code-copy-button {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 78%, transparent);
  color: var(--muted);
  display: grid;
  place-items: center;
  cursor: pointer;
}

.code-copy-button:hover {
  color: var(--fg);
  border-color: color-mix(in oklab, var(--focus) 35%, var(--border));
}

.code-copy-button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--focus) 35%, transparent);
}

.code-copy-button .icon {
  width: 18px;
  height: 18px;
}

.code-copy-icon {
  display: none;
}

.code-copy-button[data-state="idle"] .code-copy-icon--copy {
  display: block;
}

.code-copy-button[data-state="copied"] {
  color: var(--link);
  border-color: color-mix(in oklab, var(--link) 40%, var(--border));
}

.code-copy-button[data-state="copied"] .code-copy-icon--success {
  display: block;
}

.code-copy-button[data-state="error"] {
  color: #dc2626;
  border-color: color-mix(in oklab, #dc2626 35%, var(--border));
}

.code-copy-button[data-state="error"] .code-copy-icon--error {
  display: block;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-width: 0;
    padding: calc(12px + env(safe-area-inset-top)) 14px 12px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 40;
    background: color-mix(in oklab, var(--bg) 92%, transparent);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(10px);
  }

  .topbar .brand {
    margin-bottom: 0;
  }

  .brand--top {
    min-width: 0;
    max-width: 55%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .brand--sidebar {
    display: inline-block;
  }

  .sidebar-header [data-theme-toggle] {
    display: none;
  }

  .main {
    padding: calc(18px + 56px + env(safe-area-inset-top)) 14px 32px;
  }

  .spacer {
    display: none;
  }

  h1,
  h2,
  h3 {
    scroll-margin-top: calc(84px + env(safe-area-inset-top));
  }

  .toc-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    opacity: 0;
    pointer-events: none;
    transition: opacity 160ms ease;
    z-index: 30;
  }

  body.toc-open .toc-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .sidebar {
    position: fixed;
    top: calc(56px + env(safe-area-inset-top));
    left: 0;
    bottom: 0;
    width: min(86vw, 360px);
    transform: translateX(-105%);
    transition: transform 160ms ease;
    z-index: 35;
    border-right: 1px solid var(--border);
  }

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

  .sidebar-inner {
    position: relative;
    top: auto;
    max-height: none;
    height: 100%;
    padding: 18px 14px;
  }

  pre {
    padding: 12px 12px;
    border-radius: 12px;
  }
}

img,
video,
iframe,
svg {
  max-width: 100%;
  height: auto;
}

.article-list {
  list-style: none;
  padding: 0;
  margin: 1.2em 0 0;
  display: grid;
  gap: 10px;
}

.article-item {
  margin: 0;
}

.article-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  background: color-mix(in oklab, var(--border) 10%, transparent);
  font-weight: 650;
  color: var(--fg);
  text-decoration: none;
}

.article-card:hover {
  border-color: color-mix(in oklab, var(--focus) 35%, var(--border));
  color: var(--link-hover);
}

.article-card:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--focus) 35%, transparent);
}

blockquote {
  margin: 1.2em 0;
  padding: 0.5em 1em;
  border-left: 4px solid var(--border);
  color: var(--muted);
  background: color-mix(in oklab, var(--border) 18%, transparent);
  border-radius: 10px;
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.2em 0;
}

th,
td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  vertical-align: top;
}

th {
  text-align: left;
  color: var(--fg);
  background: color-mix(in oklab, var(--border) 18%, transparent);
}