:root {
  --page: #f5f7fb;
  --surface: #ffffff;
  --surface-soft: #eef4fb;
  --ink: #122033;
  --muted: #667287;
  --line: #d9e2ef;
  --line-strong: #b9c8dc;
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --blue-soft: #eaf0ff;
  --green: #16a34a;
  --green-soft: #e8f7ee;
  --amber: #f59e0b;
  --amber-soft: #fff3d8;
  --rose: #e11d48;
  --rose-soft: #ffe6ec;
  --cyan: #0e7490;
  --cyan-soft: #e2f6fb;
  --violet: #7c3aed;
  --violet-soft: #f0e8ff;
  --code: #0d1321;
  --code-text: #e8edf7;
  --shadow: 0 20px 55px rgba(15, 23, 42, .11);
  --shell: 1180px;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --page: #07101f;
  --surface: #111827;
  --surface-soft: #172033;
  --ink: #edf4fb;
  --muted: #a7b4c7;
  --line: #2b384d;
  --line-strong: #405169;
  --blue: #6ea2ff;
  --blue-dark: #93b9ff;
  --blue-soft: #17274d;
  --green: #45d187;
  --green-soft: #143529;
  --amber: #f4bd4f;
  --amber-soft: #3c2d12;
  --rose: #fb7185;
  --rose-soft: #3d1822;
  --cyan: #47c7df;
  --cyan-soft: #12333c;
  --violet: #a78bfa;
  --violet-soft: #241a43;
  --code: #050912;
  --code-text: #e8edf7;
  --shadow: 0 20px 55px rgba(0, 0, 0, .32);
}

* { box-sizing: border-box; }

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.62;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(37, 99, 235, .08), transparent 330px),
    linear-gradient(90deg, rgba(14, 116, 144, .05), rgba(22, 163, 74, .04));
  content: "";
  pointer-events: none;
}

a { color: var(--blue-dark); }

button,
input,
select {
  font: inherit;
}

code,
kbd,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

code,
kbd {
  padding: .12rem .34rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface-soft);
  font-size: .92em;
}

pre {
  margin: 16px 0 0;
  padding: 18px;
  overflow: auto;
  border-radius: 12px;
  background: var(--code);
  color: var(--code-text);
  font-size: .9rem;
}

pre code {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 12px 14px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface-soft);
  font-size: .78rem;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.shell {
  width: min(var(--shell), calc(100% - 40px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  border-radius: 9px;
  background: var(--ink);
  color: var(--page);
  font-weight: 800;
  transform: translateY(-150%);
}

.skip-link:focus { transform: none; }

.scroll-progress {
  position: fixed;
  z-index: 150;
  top: 0;
  left: 0;
  width: 0%;
  height: 4px;
  background: linear-gradient(90deg, var(--blue), var(--green), var(--amber));
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 86%, transparent);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(18px);
}

.header-inner {
  display: flex;
  min-height: 76px;
  align-items: center;
  gap: 22px;
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
}

.brand img {
  width: 46px;
  height: 46px;
  object-fit: contain;
}

html[data-theme="dark"] .brand img,
html[data-theme="dark"] .help-pill-icon {
  filter: brightness(1.18) saturate(1.08);
}

.brand span {
  display: grid;
  line-height: 1.16;
}

.brand strong { font-size: .98rem; }

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.top-nav {
  display: flex;
  margin-left: auto;
  align-items: center;
  gap: 20px;
}

.top-nav a {
  color: var(--muted);
  font-size: .84rem;
  font-weight: 800;
  text-decoration: none;
}

.top-nav a:hover,
.top-nav a[aria-current="page"] {
  color: var(--ink);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.language-control {
  position: relative;
  z-index: 1;
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 8px;
  padding: 4px 5px 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: .78rem;
  font-weight: 850;
}

.language-control.is-open {
  z-index: 3400;
}

.language-select-wrap {
  position: relative;
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 7px;
}

.language-select-wrap.is-open {
  z-index: 3200;
}

.language-select-flag {
  width: 24px;
  height: 16px;
  flex: 0 0 24px;
  border: 1px solid rgba(15, 23, 42, .16);
  border-radius: 3px;
  object-fit: cover;
  box-shadow: 0 1px 3px rgba(15, 23, 42, .16);
}

html[data-theme="dark"] .language-select-flag {
  border-color: rgba(226, 232, 240, .22);
  box-shadow: 0 1px 4px rgba(0, 0, 0, .36);
}

.language-control select.language-select-native {
  position: absolute;
  width: 1px;
  min-width: 0;
  height: 1px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  border: 0;
  opacity: 0;
  pointer-events: none;
  white-space: nowrap;
}

.language-select-button {
  display: inline-flex;
  min-width: 176px;
  max-width: 240px;
  margin: 0;
  padding: 8px 12px;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  direction: ltr;
  font: inherit;
  font-weight: 850;
  line-height: 1.2;
}

.language-select-button:focus-visible,
.language-select-option:focus-visible {
  outline: 3px solid rgba(37, 99, 235, .28);
  outline-offset: 2px;
}

.language-select-button-label {
  min-width: 0;
  overflow: hidden;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.language-select-arrow {
  width: 8px;
  height: 8px;
  margin-left: auto;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  opacity: .68;
  transform: translateY(-2px) rotate(45deg);
  transition: transform .16s ease;
}

.language-select-wrap.is-open .language-select-arrow {
  transform: translateY(2px) rotate(225deg);
}

.language-select-menu {
  position: absolute;
  z-index: 3300;
  top: calc(100% + 8px);
  right: 0;
  width: max-content;
  min-width: 240px;
  max-width: min(320px, calc(100vw - 36px));
  max-height: min(420px, calc(100vh - 120px));
  padding: 6px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: 0 18px 42px rgba(15, 23, 42, .18);
}

.language-select-menu[hidden] {
  display: none;
}

.language-select-option {
  display: flex;
  width: 100%;
  min-height: 34px;
  padding: 8px 10px;
  align-items: center;
  gap: 9px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  direction: ltr;
  font: inherit;
  font-weight: 750;
  line-height: 1.25;
  text-align: left;
}

.language-select-option:hover,
.language-select-option.is-active {
  background: rgba(37, 99, 235, .09);
}

.language-select-option[aria-selected="true"] {
  background: rgba(37, 99, 235, .13);
  color: var(--blue-dark);
}

.language-select-option-label {
  min-width: 0;
  overflow-wrap: anywhere;
}

.theme-toggle,
.button,
.copy-link-button,
.search-clear,
.section-toggle {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-weight: 800;
  line-height: 1.15;
  text-decoration: none;
}

.theme-toggle {
  width: 42px;
  padding: 0;
}

.theme-toggle img,
.help-pill-icon {
  width: 22px;
  height: 22px;
  object-fit: contain;
}

.button {
  padding: 10px 15px;
}

.button.primary {
  border-color: var(--blue);
  background: var(--blue);
  color: #fff;
}

.button.secondary {
  background: var(--surface-soft);
}

.button:hover,
.theme-toggle:hover,
.copy-link-button:hover,
.search-clear:hover,
.section-toggle:hover {
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.hero {
  display: grid;
  padding: 56px 0 38px;
  align-items: center;
  gap: 40px;
  grid-template-columns: minmax(0, .86fr) minmax(430px, 1fr);
}

.eyebrow {
  display: inline-flex;
  margin: 0 0 16px;
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--blue-dark);
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .09em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  line-height: 1.14;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

h1 {
  max-width: 760px;
  margin-bottom: 18px;
  font-size: 3.25rem;
}

h2 {
  margin-bottom: 14px;
  font-size: 2rem;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.34rem;
}

h4 {
  margin-bottom: 8px;
  font-size: 1.02rem;
}

.lead {
  max-width: 740px;
  margin: 0;
  color: var(--muted);
  font-size: 1.13rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-media,
.manual-figure {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-media figcaption,
.manual-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .88rem;
}

.support-strip {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  padding-bottom: 36px;
}

.support-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.support-card strong {
  display: block;
  margin-bottom: 6px;
}

.support-card span {
  color: var(--muted);
  font-size: .92rem;
}

.search-panel {
  position: sticky;
  z-index: 80;
  top: 76px;
  border-block: 1px solid var(--line);
  background: color-mix(in srgb, var(--page) 92%, transparent);
  backdrop-filter: blur(16px);
}

.search-inner {
  display: grid;
  min-height: 82px;
  align-items: center;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr) auto;
}

.search-box {
  position: relative;
}

.search-box input {
  width: 100%;
  min-height: 48px;
  padding: 12px 126px 12px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--ink);
  font-weight: 650;
}

.search-clear {
  position: absolute;
  top: 7px;
  right: 7px;
  min-height: 34px;
  padding: 7px 10px;
  font-size: .76rem;
}

.search-shortcut {
  position: absolute;
  top: 13px;
  right: 92px;
  min-width: 25px;
  padding: 2px 7px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 6px;
  background: var(--page);
  color: var(--muted);
  font: 750 .72rem/1.35 ui-monospace, SFMono-Regular, Consolas, monospace;
  text-align: center;
  pointer-events: none;
}

.search-meta {
  color: var(--muted);
  font-size: .9rem;
  font-weight: 750;
}

.manual-layout {
  display: grid;
  gap: 36px;
  grid-template-columns: 280px minmax(0, 1fr);
  padding: 42px 0 74px;
}

.manual-layout > *,
.manual-content,
.manual-section,
.section-head,
.toc {
  min-width: 0;
}

.toc {
  position: sticky;
  top: 178px;
  align-self: start;
  max-height: calc(100vh - 204px);
  overflow: auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
}

.toc strong {
  display: block;
  margin-bottom: 12px;
  font-size: .78rem;
  letter-spacing: .07em;
  text-transform: uppercase;
}

.toc a {
  display: block;
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--muted);
  font-size: .92rem;
  font-weight: 750;
  overflow-wrap: anywhere;
  text-decoration: none;
}

.toc a:hover,
.toc a.is-active {
  background: var(--blue-soft);
  color: var(--ink);
}

.manual-content {
  display: grid;
  gap: 28px;
}

.search-empty {
  padding: 38px 28px;
  border: 1px dashed var(--line);
  border-radius: 18px;
  background: var(--surface);
  text-align: center;
}

.search-empty h2 {
  margin-bottom: 8px;
  font-size: 1.55rem;
}

.search-empty p {
  margin: 0 auto 18px;
  color: var(--muted);
}

.manual-section {
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line);
}

.manual-section.is-hidden {
  display: none;
}

.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.section-head p {
  max-width: 760px;
  margin: 0 0 18px;
  color: var(--muted);
}

.copy-link-button {
  flex: 0 0 auto;
  min-height: 36px;
  padding: 7px 10px;
  color: var(--muted);
  font-size: .76rem;
}

.feature-grid,
.workflow-grid,
.example-grid,
.trouble-grid,
.glossary-grid {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

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

.workflow-grid,
.example-grid,
.trouble-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

.feature-card,
.workflow-card,
.example-card,
.trouble-card,
.glossary-card,
.callout,
.plan-table,
.faq details {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
}

.feature-card,
.workflow-card,
.example-card,
.trouble-card,
.glossary-card {
  padding: 18px;
}

.feature-card p,
.workflow-card p,
.example-card p,
.trouble-card p,
.glossary-card p,
.callout p {
  margin: 0;
  color: var(--muted);
}

.pill {
  display: inline-flex;
  margin-bottom: 12px;
  padding: 5px 9px;
  border-radius: 999px;
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.pill.blue { background: var(--blue-soft); color: var(--blue-dark); }
.pill.green { background: var(--green-soft); color: var(--green); }
.pill.amber { background: var(--amber-soft); color: #a15e00; }
.pill.rose { background: var(--rose-soft); color: var(--rose); }
.pill.cyan { background: var(--cyan-soft); color: var(--cyan); }
.pill.violet { background: var(--violet-soft); color: var(--violet); }

.manual-figure {
  margin: 24px 0;
}

.callout {
  margin-top: 18px;
  padding: 18px;
  border-left: 5px solid var(--blue);
}

.callout.warning { border-left-color: var(--amber); }
.callout.success { border-left-color: var(--green); }
.callout.danger { border-left-color: var(--rose); }

.ordered-steps {
  display: grid;
  gap: 12px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.ordered-steps li {
  display: grid;
  gap: 12px;
  grid-template-columns: 38px minmax(0, 1fr);
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
}

.ordered-steps b {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 11px;
  background: var(--blue);
  color: #fff;
}

.ordered-steps strong {
  display: block;
  margin-bottom: 4px;
}

.ordered-steps span {
  color: var(--muted);
}

.plan-table {
  overflow: auto;
  margin-top: 18px;
}

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

.faq details {
  padding: 0;
}

.faq summary {
  padding: 15px 18px;
  cursor: pointer;
  font-weight: 850;
}

.faq details p,
.faq details ul {
  margin: 0;
  padding: 0 18px 18px;
  color: var(--muted);
}

.section-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.section-toggle {
  padding: 9px 12px;
}

.footer {
  padding: 28px 0;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer .shell {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
}

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

.footer nav {
  display: flex;
  flex-wrap: wrap;
  margin-left: auto;
  gap: 14px;
}

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

:focus-visible {
  outline: 3px solid rgba(37, 99, 235, .35);
  outline-offset: 3px;
}

@media (max-width: 980px) {
  .header-inner {
    flex-wrap: wrap;
    padding: 12px 0;
  }

  .top-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .header-actions {
    margin-left: auto;
    flex-wrap: wrap;
    justify-content: flex-end;
  }
  .hero { grid-template-columns: 1fr; }
  h1 { font-size: 2.65rem; }
  .support-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .manual-layout { grid-template-columns: 1fr; }
  .toc {
    position: static;
    max-height: none;
  }
}

@media (max-width: 720px) {
  .shell { width: min(100% - 28px, var(--shell)); }
  .search-panel { position: static; }
  .search-inner { grid-template-columns: 1fr; padding: 14px 0; }
  .search-box input { padding-right: 16px; }
  .search-shortcut { display: none; }
  .search-clear {
    position: static;
    margin-top: 8px;
    width: 100%;
  }
  .support-strip,
  .feature-grid,
  .workflow-grid,
  .example-grid,
  .trouble-grid,
  .glossary-grid {
    grid-template-columns: 1fr;
  }
  .section-head { display: block; }
  .copy-link-button { margin-bottom: 10px; }
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.7rem; }
  .footer nav {
    width: 100%;
    margin-left: 0;
  }
}

@media print {
  body {
    background: #fff;
    color: #111827;
  }
  body::before,
  .site-header,
  .search-panel,
  .toc,
  .copy-link-button,
  .section-tools,
  .search-empty,
  .scroll-progress,
  .footer {
    display: none !important;
  }
  .shell {
    width: 100%;
  }
  .hero,
  .manual-layout {
    display: block;
    padding: 0;
  }
  .manual-section {
    break-inside: avoid;
    page-break-inside: avoid;
  }
  .manual-figure,
  .hero-media,
  .feature-card,
  .workflow-card,
  .example-card,
  .trouble-card,
  .glossary-card,
  .callout {
    box-shadow: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    transition: none !important;
  }
}