:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-subtle: #f8fafc;
  --surface-soft: #f1f5f9;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-muted: #475569;
  --text-soft: #94a3b8;
  --primary: #2563eb;
  --primary-soft: rgba(37, 99, 235, 0.08);
  --primary-soft-strong: rgba(37, 99, 235, 0.14);
  --sidebar-width: 256px;
  --toc-width: 224px;
  --content-width: 860px;
  --shadow-soft: 0 4px 24px rgba(15, 23, 42, 0.04);
  --radius-lg: 16px;
  --radius-md: 12px;
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  color-scheme: light;
}

html[data-theme="dark"] {
  --bg: #020617;
  --surface: #020617;
  --surface-subtle: #0f172a;
  --surface-soft: #111827;
  --border: #1e293b;
  --border-strong: #334155;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --text-soft: #64748b;
  --primary: #60a5fa;
  --primary-soft: rgba(96, 165, 250, 0.12);
  --primary-soft-strong: rgba(96, 165, 250, 0.2);
  --shadow-soft: 0 8px 32px rgba(0, 0, 0, 0.16);
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.5;
}

[v-cloak] {
  display: none;
}

a,
button {
  color: inherit;
}

button {
  font: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(12px);
}

.topbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  min-height: 64px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  min-width: 0;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #38bdf8, #2563eb);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand-copy strong {
  font-size: 14px;
  font-weight: 600;
}

.brand-copy small {
  font-size: 12px;
  color: var(--text-muted);
}

.topnav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  min-width: 0;
}

.topnav-link,
.toolbar-btn,
.icon-btn,
.toc-link,
.doc-center-link {
  border: 0;
  background: none;
  cursor: pointer;
}

.topnav-link {
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--text-muted);
  font-size: 14px;
  transition: background-color 0.16s ease, color 0.16s ease;
}

.topnav-link:hover,
.topnav-link.active {
  color: var(--text);
  background: var(--surface-soft);
}

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

.toolbar-btn,
.icon-btn {
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--text-muted);
  transition: background-color 0.16s ease, color 0.16s ease;
}

.toolbar-btn:hover,
.icon-btn:hover {
  color: var(--text);
  background: var(--surface-soft);
}

.mobile-only {
  display: none;
}

.shell-body {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  gap: 0;
}

.sidebar {
  min-width: 0;
}

.sidebar-panel {
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow: auto;
  padding: 24px 20px 40px 0;
  border-right: 1px solid var(--border);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  color: var(--text-soft);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sidebar-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-group + .sidebar-group {
  margin-top: 20px;
}

.sidebar-group h3 {
  margin: 0 0 6px;
  color: var(--text-soft);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sidebar-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 12px;
  margin-right: 12px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--text-muted);
  font-size: 14px;
  transition: background-color 0.16s ease, color 0.16s ease;
}

.sidebar-link:hover {
  background: var(--surface-soft);
  color: var(--text);
}

.sidebar-link.active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 500;
}

.sidebar-link small {
  color: var(--text-soft);
  font-size: 12px;
  line-height: 1.45;
}

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

.content-wrap {
  min-width: 0;
  padding: 28px 0 64px 32px;
}

.doc-header {
  margin-bottom: 16px;
}

.doc-header-copy {
  min-width: 0;
}

.eyebrow {
  margin-bottom: 10px;
  color: var(--text-soft);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.doc-header h1 {
  margin: 0 0 10px;
  font-size: 36px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.doc-header p {
  margin: 0;
  max-width: 760px;
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.75;
}

.doc-meta-row {
  margin-bottom: 24px;
}

.hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-subtle);
  color: var(--text-muted);
  font-size: 12px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--toc-width);
  gap: 32px;
  align-items: start;
}

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

.doc-center-nav {
  margin-bottom: 20px;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-subtle);
}

.doc-center-nav-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.doc-center-nav-head strong {
  font-size: 15px;
  font-weight: 600;
}

.doc-center-nav-head span {
  color: var(--text-muted);
  font-size: 13px;
}

.doc-center-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 8px;
}

.doc-center-link {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 3px;
  padding: 10px 12px;
  border-radius: 10px;
  text-align: left;
  color: var(--text-muted);
  transition: background-color 0.16s ease, color 0.16s ease;
}

.doc-center-link:hover {
  background: var(--surface-soft);
  color: var(--text);
}

.doc-center-link.active {
  background: var(--primary-soft);
  color: var(--primary);
}

.doc-center-link small {
  color: var(--text-soft);
  font-size: 12px;
}

.doc-article {
  max-width: var(--content-width);
  min-width: 0;
}

.page-toc {
  position: sticky;
  top: 92px;
  min-width: 0;
}

.toc-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 0 0 18px 18px;
  border-left: 1px solid var(--border);
}

.toc-card + .toc-card {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.toc-title {
  margin-bottom: 6px;
  color: var(--text-soft);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.toc-link {
  padding: 4px 0;
  text-align: left;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.5;
  transition: color 0.16s ease;
}

.toc-link:hover {
  color: var(--primary);
}

.doc-article .doc-section {
  scroll-margin-top: 96px;
}

.doc-article .doc-section + .doc-section {
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.doc-article h2 {
  margin: 0 0 12px;
  font-size: 28px;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.doc-article h3 {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  font-weight: 600;
}

.doc-article p,
.doc-article li {
  margin: 0;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.75;
}

.doc-article p + p {
  margin-top: 14px;
}

.doc-article ul,
.doc-article ol {
  margin: 14px 0 0;
  padding-left: 20px;
}

.doc-article li + li {
  margin-top: 8px;
}

.section-kicker {
  margin: 0 0 16px;
  color: var(--text-muted);
  font-size: 14px;
}

.stats-row,
.card-grid,
.duo-grid,
.triplet-grid,
.mini-grid,
.media-grid,
.caption-grid,
.doc-center-nav-grid {
  display: grid;
  gap: 16px;
}

.stats-row {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 18px;
}

.card-grid,
.duo-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.triplet-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.mini-grid {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.media-grid,
.caption-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 18px;
}

.info-card,
.stat-card,
.step-card,
.mini-card,
.caption-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-subtle);
}

.stat-card strong {
  display: block;
  font-size: 28px;
  line-height: 1;
  letter-spacing: -0.03em;
}

.stat-card span,
.mini-card p,
.caption-card p,
.info-card p {
  display: block;
  margin-top: 8px;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--surface-subtle);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 12px;
}

.note {
  margin-top: 18px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-subtle);
}

.note strong {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
}

.note.warn {
  background: rgba(245, 158, 11, 0.08);
}

.note.info {
  background: var(--primary-soft);
}

.note.danger {
  background: rgba(239, 68, 68, 0.08);
}

.step-list {
  display: grid;
  gap: 14px;
}

.step-card {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.step-index {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  background: var(--primary-soft-strong);
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
}

.code-block {
  margin-top: 18px;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #0f172a;
  box-shadow: var(--shadow-soft);
}

.code-head {
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.72);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.code-block pre {
  margin: 0;
  padding: 16px;
  overflow: auto;
}

.code-block code {
  color: #dbeafe;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.72;
}

.table-wrap {
  margin-top: 18px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.doc-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  background: var(--surface);
}

.doc-table th,
.doc-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

.doc-table th {
  background: var(--surface-subtle);
  color: var(--text);
  font-weight: 600;
}

.doc-table td {
  color: var(--text-muted);
}

.media-block {
  margin: 0;
  padding: 0;
}

.media-block video,
.media-block img {
  width: 100%;
  display: block;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-subtle);
}

.media-block video {
  aspect-ratio: 16 / 9;
  object-fit: contain;
}

.media-block img {
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.media-block figcaption {
  margin-top: 8px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.6;
}

.inline-code {
  display: inline-flex;
  align-items: center;
  padding: 0 6px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface-subtle);
  color: var(--primary);
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.link-list {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.link-row {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-subtle);
}

.link-row span:first-child {
  color: var(--text);
  font-weight: 500;
}

.link-row span:last-child {
  color: var(--text-muted);
  font-size: 13px;
}

@media (max-width: 1180px) {
  .shell-body {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    top: 64px;
    left: 16px;
    bottom: 16px;
    z-index: 50;
    width: min(320px, calc(100vw - 32px));
    transform: translateX(-120%);
    transition: transform 0.2s ease;
  }

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

  .sidebar-panel {
    height: 100%;
    padding: 20px 16px 24px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--surface);
    box-shadow: var(--shadow-soft);
  }

  .content-wrap {
    padding-left: 0;
  }

  .mobile-only {
    display: inline-flex;
  }
}

@media (max-width: 1080px) {
  .article-layout {
    grid-template-columns: 1fr;
  }

  .page-toc {
    position: static;
    margin-top: 24px;
  }

  .toc-card {
    padding-left: 0;
    border-left: 0;
  }
}

@media (max-width: 860px) {
  .topnav {
    display: none;
  }

  .stats-row,
  .triplet-grid,
  .card-grid,
  .duo-grid,
  .media-grid,
  .caption-grid {
    grid-template-columns: 1fr;
  }

  .doc-center-nav-head,
  .link-row {
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .topbar-inner,
  .shell-body {
    padding-left: 16px;
    padding-right: 16px;
  }

  .content-wrap {
    padding-top: 20px;
  }

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

  .doc-center-nav-grid {
    grid-template-columns: 1fr;
  }
}