:root {
  --canvas: #0a0a0b;
  --surface: #111113;
  --elevated: #18181b;
  --hover: #1f1f23;
  --border: #27272a;
  --border-strong: #3f3f46;
  --text: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --ok: #4ade80;
  --warn: #fbbf24;
  --error: #f87171;
  --font-sans: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { background: var(--canvas); }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  background: var(--canvas);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button,
input { font: inherit; }

button,
a { -webkit-tap-highlight-color: transparent; }

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}

.sidebar {
  width: 260px;
  height: 100vh;
  position: sticky;
  top: 0;
  flex: 0 0 260px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  background: var(--surface);
  border-right: 1px solid var(--border);
  z-index: 80;
}

.sidebar-header {
  min-height: 48px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
}

.sidebar-title {
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.search-box {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.search-input {
  width: 100%;
  height: 34px;
  padding: 0 10px;
  color: var(--text);
  background: var(--canvas);
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
}

.search-input::placeholder { color: var(--text-muted); }
.search-input:hover { border-color: var(--border-strong); }
.search-input:focus { border-color: var(--text-secondary); }

.nav-groups {
  flex: 1;
  padding: 12px 0 24px;
}

.nav-group + .nav-group { margin-top: 12px; }

.nav-group-title {
  padding: 8px 16px 4px;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.nav-link {
  display: block;
  min-height: 32px;
  padding: 6px 16px 6px 14px;
  color: var(--text-secondary);
  border-left: 2px solid transparent;
  text-decoration: none;
}

.nav-link:hover {
  color: var(--text);
  background: var(--hover);
}

.nav-link.active {
  color: var(--text);
  border-left-color: var(--text);
  font-weight: 500;
}

.nav-link[hidden],
.nav-group[hidden] { display: none; }

.sidebar-empty {
  display: none;
  margin: 8px 16px;
  color: var(--text-muted);
  font-size: 13px;
}

.main-wrapper {
  min-width: 0;
  flex: 1;
}

.top-nav {
  height: 48px;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--canvas);
  border-bottom: 1px solid var(--border);
}

.top-nav-left,
.top-nav-right,
.brand-link {
  display: flex;
  align-items: center;
}

.top-nav-left { min-width: 0; gap: 12px; }
.top-nav-right { gap: 16px; }

.brand-link {
  gap: 8px;
  color: var(--text);
  font-weight: 600;
  letter-spacing: -.01em;
  text-decoration: none;
  white-space: nowrap;
}

.brand-icon {
  width: 22px;
  height: 22px;
  flex: 0 0 auto;
}

.product-area {
  color: var(--text-muted);
  white-space: nowrap;
}

.header-link,
.markdown-body a,
.chapter-btn {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--border-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.header-link:hover,
.markdown-body a:hover,
.chapter-btn:hover { text-decoration-color: var(--text); }

.menu-button {
  display: none;
  width: 34px;
  height: 34px;
  padding: 0;
  align-items: center;
  justify-content: center;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
}

.menu-button:hover { background: var(--hover); }
.menu-button svg { width: 18px; height: 18px; }

.sidebar-backdrop { display: none; }

.content-container {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 32px 80px;
}

.markdown-body { min-width: 0; }

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  position: relative;
  color: var(--text);
  font-weight: 600;
  letter-spacing: -.01em;
  line-height: 1.25;
}

.markdown-body h1 {
  margin: 0 0 24px;
  font-size: 32px;
}

.markdown-body h2 {
  margin: 32px 0 12px;
  padding-top: 8px;
  font-size: 22px;
}

.markdown-body h3 {
  margin: 24px 0 8px;
  font-size: 17px;
}

.markdown-body h4 {
  margin: 20px 0 8px;
  font-size: 14px;
}

.heading-anchor {
  position: absolute;
  right: 100%;
  padding-right: 8px;
  color: var(--text-muted) !important;
  opacity: 0;
  text-decoration: none !important;
}

.markdown-body h1:hover .heading-anchor,
.markdown-body h2:hover .heading-anchor,
.markdown-body h3:hover .heading-anchor,
.markdown-body h4:hover .heading-anchor,
.heading-anchor:focus { opacity: 1; }

.markdown-body p,
.markdown-body ul,
.markdown-body ol {
  margin: 0 0 16px;
  color: var(--text-secondary);
}

.markdown-body ul,
.markdown-body ol { padding-left: 24px; }
.markdown-body li + li { margin-top: 4px; }
.markdown-body strong { color: var(--text); font-weight: 600; }
.markdown-body hr { margin: 32px 0; border: 0; border-top: 1px solid var(--border); }

.markdown-body blockquote {
  margin: 20px 0;
  padding: 2px 0 2px 16px;
  color: var(--text-secondary);
  border-left: 2px solid var(--border-strong);
}

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

.markdown-body code,
.code-block-wrapper pre {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
}

.markdown-body :not(pre) > code {
  padding: 2px 5px;
  color: var(--text);
  background: var(--elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.code-block-wrapper {
  margin: 20px 0;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.code-block-header {
  min-height: 38px;
  padding: 6px 8px 6px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}

.code-lang {
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.code-actions { display: flex; align-items: center; gap: 8px; }

.btn-code-action {
  min-height: 26px;
  padding: 3px 8px;
  display: inline-flex;
  align-items: center;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 12px;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
}

.btn-code-action:hover {
  color: var(--text);
  background: var(--hover);
  border-color: var(--border-strong);
}

.btn-code-copy[data-state="copied"] { color: var(--ok); }

.code-block-wrapper pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  color: var(--text);
  background: var(--surface);
}

.code-block-wrapper pre code {
  padding: 0;
  color: inherit;
  background: transparent;
  border: 0;
}

.markdown-body table {
  width: 100%;
  margin: 20px 0;
  border-collapse: collapse;
  color: var(--text-secondary);
  font-size: 13px;
}

.markdown-body th,
.markdown-body td {
  padding: 9px 12px;
  text-align: left;
  vertical-align: top;
  border: 1px solid var(--border);
}

.markdown-body th {
  color: var(--text);
  background: var(--surface);
  font-weight: 600;
}

.chapter-nav {
  margin-top: 48px;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--border);
}

.chapter-btn {
  max-width: 48%;
  display: flex;
  flex-direction: column;
  text-decoration: none;
}

.chapter-btn.next { margin-left: auto; text-align: right; }
.chapter-btn:hover .nav-title { text-decoration-color: var(--text); }

.nav-direction {
  color: var(--text-muted);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.nav-title {
  margin-top: 4px;
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--border-strong);
  text-underline-offset: 3px;
}

.token.keyword { color: #ffffff; font-weight: 600; }
.token.builtin,
.token.function { color: #e4e4e7; }
.token.hook { color: #e4e4e7; font-weight: 600; }
.token.type,
.token.class-name,
.token.namespace { color: #d4d4d8; font-style: italic; }
.token.string,
.token.raw-string,
.token.template-string { color: #9cc9ff; }
.token.template-string .token.interpolation,
.token.template-string .token.interpolation .token { color: #c7d2e0; }
.token.number,
.token.boolean,
.token.constant { color: #b8c8e0; }
.token.comment { color: #52525b; font-style: italic; }
.token.attribute,
.token.attr-name { color: #71717a; }
.token.operator { color: #a1a1aa; }
.token.punctuation,
.token.interpolation-punctuation { color: #71717a; }

@media (max-width: 760px) {
  body { display: block; }

  .sidebar {
    width: min(320px, calc(100vw - 40px));
    height: calc(100vh - 48px);
    position: fixed;
    top: 48px;
    left: 0;
    transform: translateX(-100%);
    transition: transform 160ms ease;
  }

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

  .sidebar-header { display: none; }

  .sidebar-backdrop {
    position: fixed;
    inset: 48px 0 0;
    z-index: 70;
    background: rgba(10, 10, 11, .72);
  }

  body.menu-open .sidebar-backdrop { display: block; }

  .top-nav { padding: 0 12px; }
  .menu-button { display: inline-flex; }
  .top-nav-left { gap: 8px; }
  .top-nav-right { gap: 12px; }
  .product-area { font-size: 13px; }
  .header-link { font-size: 13px; }

  .content-container { padding: 24px 20px 64px; }
  .markdown-body h1 { font-size: 28px; }
  .markdown-body h2 { font-size: 20px; }
  .heading-anchor { display: none; }

  .markdown-body table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .chapter-nav { align-items: flex-start; }
  .chapter-btn { max-width: 50%; }
}

@media (max-width: 390px) {
  .top-nav-right { gap: 8px; }
  .brand-link { gap: 6px; font-size: 13px; }
  .brand-icon { width: 20px; height: 20px; }
  .product-area,
  .header-link { font-size: 12px; }
  .content-container { padding-left: 16px; padding-right: 16px; }
  .code-block-header { align-items: flex-start; }
  .code-actions { gap: 4px; }
  .btn-code-action { padding-left: 6px; padding-right: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}