:root {
  --bright-bg: #f8fbfc;
  --bright-surface: #ffffff;
  --bright-mist: #f1f6f8;
  --bright-ink: #0f2742;
  --bright-muted: #526478;
  --bright-soft: #6c7d90;
  --bright-line: #dce7ec;
  --bright-emerald: #007f61;
  --bright-cyan: #087e98;
  --bright-amber: #a56909;
  --bright-emerald-soft: #dff8ef;
  --bright-cyan-soft: #ddf6fa;
  --bright-amber-soft: #fff7e6;
  --bright-amber-line: #e8ce98;
  --bright-code-bg: #f4f7f9;
  --bright-code-ink: #13314a;
  --bright-code-line: #e3edf2;
  --bright-search-hover: #eef5f8;
  --sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --container-max: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --header-height: 72px;
  --transition-fast: 0.15s ease;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--bright-ink);
  background-color: var(--bright-bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 1000;
  border-radius: var(--radius-sm);
  padding: 0.5rem 1rem;
  color: #fff;
  background: var(--bright-cyan);
  font-weight: 600;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
}

:focus-visible {
  outline: 2px solid var(--bright-cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============ Sticky public header ============ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--bright-line);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.nav-inner {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

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

.brand-lockup {
  display: block;
  width: auto;
  height: 38px;
  max-width: 198px;
  object-fit: contain;
}

.nav-actions,
.nav-menu {
  display: flex;
  align-items: center;
}

.nav-actions {
  gap: 1.25rem;
}

.nav-menu {
  gap: 1.5rem;
  list-style: none;
}

.nav-menu a {
  color: var(--bright-muted);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--bright-cyan);
}

.lang-select-wrapper {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.lang-select {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid var(--bright-line);
  border-radius: var(--radius-sm);
  padding: 0.4rem 2rem 0.4rem 0.75rem;
  color: var(--bright-ink);
  background-color: var(--bright-mist);
  font-family: var(--sans);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.lang-select:hover {
  border-color: var(--bright-soft);
}

.lang-select-wrapper::after {
  content: "";
  position: absolute;
  right: 0.75rem;
  width: 0;
  height: 0;
  border-top: 5px solid var(--bright-muted);
  border-right: 4px solid transparent;
  border-left: 4px solid transparent;
  pointer-events: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  border-radius: var(--radius-md);
  padding: 0.45rem 1rem;
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.btn-outline {
  border-color: var(--bright-line);
  color: var(--bright-ink);
  background-color: transparent;
}

.btn-outline:hover {
  border-color: var(--bright-soft);
  background-color: var(--bright-mist);
}

.btn-primary {
  border-color: var(--bright-emerald);
  color: #fff;
  background-color: var(--bright-emerald);
}

.btn-primary:hover {
  border-color: #006e54;
  background-color: #006e54;
}

/* ============ Mobile TOC (details jump menu) ============ */
.mobile-toc {
  display: none;
  position: sticky;
  top: var(--header-height);
  z-index: 90;
  border-bottom: 1px solid var(--bright-line);
  padding: 0.75rem 1.5rem;
  background-color: var(--bright-surface);
}

.mobile-toc summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--bright-ink);
  font-size: 0.875rem;
  font-weight: 700;
  list-style-type: none;
  cursor: pointer;
}

.mobile-toc summary::-webkit-details-marker {
  display: none;
}

.mobile-toc summary::after {
  content: "+";
  color: var(--bright-muted);
  font-weight: 700;
}

.mobile-toc[open] summary::after {
  content: "−";
}

.mobile-toc-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 280px;
  overflow-y: auto;
  margin-top: 0.75rem;
  border-top: 1px solid var(--bright-line);
  padding-top: 0.5rem;
  list-style: none;
}

.mobile-toc-list a {
  color: var(--bright-muted);
  font-size: 0.875rem;
  text-decoration: none;
  padding: 0.25rem 0.25rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.mobile-toc-list a:hover,
.mobile-toc-list a.active {
  color: var(--bright-cyan);
  background-color: var(--bright-cyan-soft);
}

/* ============ Docs main layout ============ */
.docs-main {
  flex: 1;
  padding: 2rem 0 4rem;
}

.docs-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 3rem;
  align-items: start;
}

.docs-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
  max-height: calc(100vh - var(--header-height) - 48px);
  overflow-y: auto;
  border: 1px solid var(--bright-line);
  border-radius: var(--radius-md);
  padding: 1.25rem 1rem;
  background-color: var(--bright-surface);
}

.docs-nav {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.nav-group h3 {
  margin-bottom: 0.5rem;
  padding: 0 0.5rem;
  color: var(--bright-soft);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
}

.nav-group ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.nav-group a {
  display: block;
  border-left: 2px solid transparent;
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.5rem;
  color: var(--bright-muted);
  font-size: 0.875rem;
  line-height: 1.4;
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast);
}

.nav-group a:hover {
  color: var(--bright-ink);
  background-color: var(--bright-mist);
}

.docs-nav a.active,
.nav-group a.active {
  border-left-color: var(--bright-cyan);
  color: var(--bright-cyan);
  background-color: var(--bright-cyan-soft);
  font-weight: 700;
}

/* ============ Article area ============ */
.docs-article {
  width: 100%;
  max-width: 820px;
  min-width: 0;
}

.docs-header {
  margin-bottom: 2rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--bright-line);
}

.docs-tag {
  display: inline-block;
  margin-bottom: 0.75rem;
  border-radius: var(--radius-sm);
  padding: 0.2rem 0.5rem;
  color: var(--bright-emerald);
  background-color: var(--bright-emerald-soft);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0;
}

.docs-title {
  margin-bottom: 0.5rem;
  color: var(--bright-ink);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0;
}

.docs-meta {
  color: var(--bright-soft);
  font-size: 0.8125rem;
  margin-bottom: 0.875rem;
}

.docs-intro {
  color: var(--bright-muted);
  font-size: 0.95rem;
  max-width: 68ch;
  margin-bottom: 1.25rem;
}

/* ============ Search ============ */
.docs-search-wrapper {
  position: relative;
  margin-bottom: 1.25rem;
  max-width: 540px;
}

.docs-search {
  width: 100%;
  min-height: 42px;
  box-sizing: border-box;
  border: 1px solid var(--bright-line);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.75rem 0.5rem 2.25rem;
  color: var(--bright-ink);
  background-color: var(--bright-surface);
  font-family: var(--sans);
  font-size: 0.9375rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.docs-search::placeholder {
  color: var(--bright-soft);
}

.docs-search:hover {
  border-color: var(--bright-soft);
}

.docs-search:focus,
.docs-search:focus-visible {
  outline: none;
  border-color: var(--bright-cyan);
  box-shadow: 0 0 0 3px var(--bright-cyan-soft);
}

.docs-search-wrapper::before {
  content: "";
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  border: 2px solid var(--bright-soft);
  border-radius: 50%;
  pointer-events: none;
}

.docs-search-wrapper::after {
  content: "";
  position: absolute;
  left: 1.5rem;
  top: calc(50% + 3px);
  width: 7px;
  height: 2px;
  background: var(--bright-soft);
  transform-origin: left center;
  transform: rotate(45deg);
  pointer-events: none;
}

.docs-search-results {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  z-index: 80;
  max-height: 360px;
  overflow-y: auto;
  border: 1px solid var(--bright-line);
  border-radius: var(--radius-md);
  background-color: var(--bright-surface);
  box-shadow: 0 1px 2px rgba(15, 39, 66, 0.06);
}

.docs-search-results[hidden] {
  display: none;
}

.docs-search-results-item {
  display: block;
  width: 100%;
  text-align: left;
  border: 0;
  border-radius: 0;
  padding: 0.625rem 0.875rem;
  background-color: transparent;
  color: var(--bright-ink);
  font-family: var(--sans);
  font-size: 0.875rem;
  line-height: 1.45;
  text-decoration: none;
  cursor: pointer;
  border-bottom: 1px solid var(--bright-line);
  transition: background-color var(--transition-fast);
}

.docs-search-results-item:last-child {
  border-bottom: 0;
}

.docs-search-results-item:hover,
.docs-search-results-item.focused,
.docs-search-results-item:focus-visible {
  background-color: var(--bright-search-hover);
  outline: none;
}

.docs-search-results-item .result-title {
  display: block;
  color: var(--bright-ink);
  font-weight: 600;
  margin-bottom: 0.125rem;
}

.docs-search-results-item .result-path {
  display: block;
  color: var(--bright-soft);
  font-size: 0.75rem;
}

.docs-search-results-item mark {
  background: var(--bright-cyan-soft);
  color: var(--bright-ink);
  padding: 0 2px;
  border-radius: 2px;
}

.docs-search-results-empty,
.docs-search-results-hint {
  padding: 0.75rem 0.875rem;
  color: var(--bright-soft);
  font-size: 0.8125rem;
}

/* ============ Quick links ============ */
.quick-links {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.875rem;
  margin-top: 0.5rem;
}

.quick-link-card {
  display: block;
  border: 1px solid var(--bright-line);
  border-radius: var(--radius-md);
  padding: 0.875rem 1rem;
  background-color: var(--bright-surface);
  text-decoration: none;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.quick-link-card:hover,
.quick-link-card:focus-visible {
  border-color: var(--bright-cyan);
  background-color: var(--bright-mist);
  outline: none;
}

.quick-link-card h2 {
  margin-bottom: 0.25rem;
  color: var(--bright-ink);
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0;
}

.quick-link-card p {
  color: var(--bright-muted);
  font-size: 0.8125rem;
  line-height: 1.5;
  margin: 0;
}

/* ============ Article sections ============ */
.docs-section {
  scroll-margin-top: calc(var(--header-height) + 16px);
  padding: 1.75rem 0;
}

.docs-section:not(:last-child) {
  border-bottom: 1px solid var(--bright-line);
}

.docs-section:first-of-type {
  padding-top: 1.5rem;
}

.docs-section h2 {
  margin-bottom: 1rem;
  color: var(--bright-ink);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0;
}

.docs-section h3 {
  margin-top: 1.5rem;
  margin-bottom: 0.625rem;
  color: var(--bright-ink);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0;
}

.docs-section p {
  margin-bottom: 1rem;
  color: var(--bright-ink);
  font-size: 0.95rem;
  line-height: 1.65;
}

.docs-section ul,
.docs-section ol {
  margin: 0.5rem 0 1rem;
  padding-left: 1.5rem;
  color: var(--bright-ink);
  font-size: 0.95rem;
  line-height: 1.65;
}

.docs-section li {
  margin-bottom: 0.4rem;
  overflow-wrap: break-word;
}

.docs-section strong {
  color: var(--bright-ink);
  font-weight: 700;
}

.docs-section a {
  color: var(--bright-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

.docs-section a:hover {
  color: #006f86;
}

.docs-section code {
  font-family: var(--mono);
  font-size: 0.875em;
  padding: 0.1rem 0.3rem;
  background-color: var(--bright-mist);
  border: 1px solid var(--bright-line);
  border-radius: var(--radius-sm);
  color: var(--bright-code-ink);
  word-break: break-word;
}

/* ============ Step list ============ */
.step-list {
  counter-reset: step;
  list-style: none;
  padding-left: 0;
  margin: 0.5rem 0 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.step-list li {
  position: relative;
  padding-left: 2.5rem;
  counter-increment: step;
}

.step-list li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.125rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border: 1px solid var(--bright-line);
  border-radius: var(--radius-sm);
  background-color: var(--bright-mist);
  color: var(--bright-cyan);
  font-size: 0.8125rem;
  font-weight: 700;
}

.step-list li strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--bright-ink);
  font-size: 0.95rem;
}

.step-list li p {
  margin: 0;
  color: var(--bright-muted);
  font-size: 0.875rem;
}

/* ============ Callouts ============ */
.callout {
  margin: 1.25rem 0;
  border: 1px solid var(--bright-line);
  border-left-width: 4px;
  border-radius: var(--radius-sm);
  padding: 0.875rem 1rem;
  font-size: 0.875rem;
  line-height: 1.55;
  color: var(--bright-ink);
}

.callout strong {
  font-weight: 700;
}

.callout.notice {
  border-left-color: var(--bright-cyan);
  background-color: var(--bright-cyan-soft);
}

.callout.warning {
  border-left-color: var(--bright-amber);
  background-color: var(--bright-amber-soft);
}

/* ============ Code block with copy control ============ */
.code-block {
  position: relative;
  margin: 1rem 0;
  border: 1px solid var(--bright-line);
  border-radius: var(--radius-md);
  background-color: var(--bright-code-bg);
  overflow: hidden;
}

.code-block pre {
  margin: 0;
  padding: 0.875rem 1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--bright-code-ink);
  white-space: pre;
}

.code-block code {
  font-family: var(--mono);
  font-size: inherit;
  padding: 0;
  background: none;
  border: 0;
  color: inherit;
  word-break: normal;
}

.btn-copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--bright-line);
  border-radius: var(--radius-sm);
  background-color: var(--bright-surface);
  color: var(--bright-muted);
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.btn-copy:hover {
  background-color: var(--bright-mist);
  color: var(--bright-ink);
  border-color: var(--bright-soft);
}

.btn-copy:focus-visible {
  outline: 2px solid var(--bright-cyan);
  outline-offset: 2px;
}

.btn-copy.copied {
  color: var(--bright-emerald);
  border-color: var(--bright-emerald);
  background-color: var(--bright-emerald-soft);
}

/* ============ Data tables ============ */
.table-responsive {
  overflow-x: auto;
  margin: 1.25rem 0;
  border: 1px solid var(--bright-line);
  border-radius: var(--radius-md);
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 600px;
  font-size: 0.875rem;
  line-height: 1.5;
}

.data-table thead th {
  text-align: left;
  padding: 0.625rem 0.875rem;
  background-color: var(--bright-mist);
  color: var(--bright-ink);
  font-weight: 700;
  border-bottom: 1px solid var(--bright-line);
  white-space: nowrap;
}

.data-table tbody td {
  padding: 0.625rem 0.875rem;
  color: var(--bright-ink);
  border-bottom: 1px solid var(--bright-line);
  vertical-align: top;
  overflow-wrap: break-word;
}

.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table tbody tr {
  transition: background-color var(--transition-fast);
}

.data-table tbody tr:hover {
  background-color: var(--bright-mist);
}

.data-table td:first-child {
  color: var(--bright-ink);
  font-weight: 600;
  white-space: nowrap;
}

/* ============ Footer ============ */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--bright-line);
  padding: 2.25rem 0 1.75rem;
  background-color: var(--bright-surface);
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem 3rem;
  text-align: left;
}

.footer-disclaimer {
  flex: 1 1 22.5rem;
  min-width: 0;
}

.footer-disclaimer-title {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--bright-ink);
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0;
}

.footer-disclaimer-body {
  margin: 0;
  max-width: 68ch;
  color: var(--bright-muted);
  font-size: 0.8125rem;
  font-weight: 400;
  line-height: 1.75;
  overflow-wrap: break-word;
}

.footer-legal-row {
  display: flex;
  flex: 1 1 21rem;
  min-width: 0;
  flex-direction: column;
  gap: 0.875rem;
}

.footer-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  list-style: none;
}

.footer-links a {
  color: var(--bright-muted);
  font-size: 0.8125rem;
  font-weight: 600;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--bright-cyan);
}

.footer-copy {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.375rem 1.5rem;
  color: var(--bright-muted);
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.5;
}

.footer-registration {
  display: inline-flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
}

.footer-license,
.footer-icp {
  color: var(--bright-muted);
}

.footer-icp {
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-icp:hover {
  color: var(--bright-cyan);
  text-decoration: underline;
}

/* ============ Responsive ============ */
@media (max-width: 960px) {
  .docs-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .docs-sidebar {
    display: none;
  }

  .mobile-toc {
    display: block;
  }

  .docs-article {
    max-width: none;
  }

  .docs-title {
    font-size: 1.75rem;
  }

  .quick-links {
    grid-template-columns: 1fr;
    gap: 0.625rem;
  }
}

@media (max-width: 720px) {
  :root {
    --header-height: 64px;
  }

  .nav-inner {
    min-height: 64px;
  }

  .mobile-toc {
    top: 64px;
    padding: 0.625rem 1.25rem;
  }

  .nav-menu,
  .nav-actions .btn {
    display: none;
  }

  .docs-main {
    padding: 1.5rem 0 3rem;
  }

  .docs-header {
    padding-bottom: 1.5rem;
  }

  .docs-search-wrapper {
    max-width: none;
  }

  .docs-section {
    padding: 1.5rem 0;
  }

  .footer {
    padding: 2rem 0 1.5rem;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }

  .footer-disclaimer,
  .footer-legal-row {
    flex: 0 1 auto;
    width: 100%;
  }

  .footer-disclaimer-body {
    max-width: 100%;
  }

  .footer-copy {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.375rem;
  }
}

@media (max-width: 420px) {
  .container {
    padding-right: 1rem;
    padding-left: 1rem;
  }

  .brand-lockup {
    height: 31px;
    max-width: 161px;
  }

  .docs-title {
    font-size: 1.55rem;
  }

  .docs-section h2 {
    font-size: 1.25rem;
  }

  .quick-link-card {
    padding: 0.75rem 0.875rem;
  }

  .code-block pre {
    padding: 0.75rem 0.875rem;
    font-size: 0.8rem;
  }
}

/* ============ Reduced motion ============ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}