:root {
  --color-bg: #DCEBF0;
  --color-panel: #F3F9FB;
  --color-panel-muted: #CFE1E8;
  --color-border: #B7CDD7;
  --color-accent: #25318F;
  --color-accent-dark: #18205F;
  --color-accent-bright: #35C2DD;
  --color-text: #131A33;
  --color-text-muted: #55617F;
  --color-success: #1F8F6A;
  --color-warning: #C98A1A;
  --color-error: #C73E4B;
  --color-on-accent: #F3F9FB;
  --color-terminal: #131A33;
  --color-terminal-text: #E6F0F4;
  --color-terminal-muted: rgba(230, 240, 244, .58);
  --color-terminal-border: rgba(243, 249, 251, .12);
  --color-dot: rgba(19, 26, 51, .09);
  --color-accent-tint: rgba(37, 49, 143, .08);
  --color-accent-shadow: rgba(37, 49, 143, .14);
  --color-accent-shadow-soft: rgba(37, 49, 143, .08);
  --color-highlight: rgba(255, 255, 255, .72);
  --color-highlight-soft: rgba(255, 255, 255, .14);
  --color-cyan-halo: rgba(53, 194, 221, .2);
  --color-flag-red: #D2434F;
  --color-flag-blue: #2C4A9C;
  --color-flag-green: #2E9A5B;
  --color-flag-white: #F7FAFB;
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Menlo, Consolas, 'Liberation Mono', monospace;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 10px;
  --radius-pill: 999px;
  --content-width: 1360px;
  --reading-width: 800px;
  --gutter: 40px;
  --header-height: 64px;
  --notice-height: 36px;
  --focus-width: 2px;
  --shadow-panel: 0 24px 48px -16px var(--color-accent-shadow), 0 2px 6px -2px var(--color-accent-shadow-soft), inset 0 1px 0 var(--color-highlight);
  --shadow-button: 0 16px 30px -12px var(--color-accent-shadow), inset 0 1px 0 var(--color-highlight-soft);
  --section-space: 96px;
  --toc-offset: 132px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  min-width: 0;
}

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
}

html.nav-open {
  overflow: hidden;
}

body {
  margin: 0;
  padding: 0;
  overflow-x: clip;
  background-color: var(--color-bg);
  background-image: radial-gradient(circle, var(--color-dot) 1px, transparent 1.3px);
  background-size: 16px 16px;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main,
section,
article,
header,
footer {
  max-width: 100%;
}

img,
svg,
video,
canvas {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

button,
input,
select,
textarea {
  color: inherit;
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

p,
ul,
ol,
blockquote,
pre,
table {
  margin-top: 0;
}

ul,
ol {
  padding-left: 1.4em;
}

h1,
h2,
h3,
h4 {
  color: var(--color-text);
  font-family: var(--font-display);
  text-wrap: balance;
}

h1 {
  margin: 0 0 24px;
  font-size: clamp(52px, 5.2vw, 64px);
  font-weight: 400;
  letter-spacing: -.02em;
  line-height: 1.1;
}

h2 {
  margin: 0 0 24px;
  font-size: clamp(34px, 4vw, 52px);
  font-weight: 400;
  letter-spacing: -.018em;
  line-height: 1.16;
}

h3 {
  margin: 0 0 14px;
  font-size: clamp(22px, 2.2vw, 30px);
  font-weight: 500;
  letter-spacing: -.01em;
  line-height: 1.25;
}

h4 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 600;
}

strong {
  color: var(--color-text);
  font-weight: 650;
}

code,
kbd,
samp {
  font-family: var(--font-mono);
}

:not(pre) > code {
  padding: .12em .35em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel-muted);
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid var(--color-terminal-border);
  border-radius: var(--radius-sm);
  background: var(--color-terminal);
  color: var(--color-terminal-text);
  font: 13px/1.7 var(--font-mono);
  -webkit-overflow-scrolling: touch;
}

pre code {
  white-space: pre;
}

hr {
  height: 1px;
  margin: 40px 0;
  border: 0;
  background: var(--color-border);
}

.wrap {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.reading {
  width: 100%;
  max-width: var(--reading-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
  overflow-x: clip;
}

.section-muted {
  background: var(--color-panel-muted);
}

.no-break {
  white-space: nowrap;
}

.mono {
  font-family: var(--font-mono);
}

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

.eyebrow,
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--color-text-muted);
  font: 13px/1.4 var(--font-mono);
  letter-spacing: .06em;
}

.eyebrow::before,
.kicker::before {
  width: 8px;
  height: 8px;
  flex: 0 0 8px;
  border-radius: var(--radius-pill);
  background: var(--color-accent-bright);
  box-shadow: 0 0 0 3px var(--color-cyan-halo);
  content: "";
}

.section-head {
  max-width: 850px;
  margin-bottom: 42px;
}

.section-head p {
  max-width: 720px;
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 18px;
}

.panel,
.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel);
}

.badge {
  display: inline-flex;
  min-height: 28px;
  max-width: 100%;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-text-muted);
  font: 12px/1.4 var(--font-mono);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.badge-accent {
  border-color: var(--color-accent);
  background: var(--color-accent-tint);
  color: var(--color-accent);
}

.badge-success::before {
  width: 7px;
  height: 7px;
  flex: 0 0 7px;
  border-radius: 50%;
  background: var(--color-success);
  content: "";
}

.btn {
  min-height: 48px;
  padding: 0 26px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 650;
  letter-spacing: .01em;
  line-height: 1.2;
  transition: transform .15s ease, box-shadow .15s ease, background-color .15s ease, border-color .15s ease;
}

.btn svg {
  width: 15px;
  height: 15px;
  flex: 0 0 15px;
}

.btn-primary {
  background: linear-gradient(180deg, var(--color-accent), var(--color-accent-dark));
  color: var(--color-on-accent);
  box-shadow: var(--shadow-button);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 20px 34px -12px var(--color-accent-shadow), inset 0 1px 0 var(--color-highlight-soft);
}

.btn-secondary {
  border-color: var(--color-accent);
  background: transparent;
  color: var(--color-accent);
}

.btn-secondary:hover {
  background: var(--color-accent-tint);
}

.btn-subtle {
  border-color: var(--color-border);
  background: var(--color-panel);
  color: var(--color-text);
}

.btn[aria-disabled="true"],
.btn:disabled {
  cursor: not-allowed;
  opacity: .55;
  transform: none;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="tab"]:focus-visible {
  outline: var(--focus-width) solid var(--color-accent-bright);
  outline-offset: 3px;
}

.notice {
  position: relative;
  height: var(--notice-height);
  overflow: hidden;
  background: var(--color-accent-dark);
  color: var(--color-on-accent);
  font: 12px/1 var(--font-mono);
  letter-spacing: .02em;
}

.notice .wrap {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 22px;
}

.notice-msg {
  display: flex;
  align-items: center;
  gap: 10px;
  opacity: .92;
}

.notice-msg::before {
  width: 6px;
  height: 6px;
  flex: 0 0 6px;
  border-radius: 50%;
  background: var(--color-accent-bright);
  content: "";
}

.notice-link {
  min-height: 24px;
  display: inline-flex;
  align-items: center;
  border-bottom: 1px solid var(--color-terminal-border);
  opacity: .72;
}

.notice-link:hover {
  opacity: 1;
}

.notice-dots {
  position: absolute;
  inset: 0 0 0 auto;
  width: min(360px, 32vw);
  max-width: 100%;
  pointer-events: none;
  mask-image: linear-gradient(90deg, transparent, #000 55%);
}

.notice-dots::before {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-bright));
  content: "";
  mask-image: radial-gradient(circle, #000 1.5px, transparent 1.9px);
  mask-size: 8px 8px;
}

.site-header {
  position: relative;
  z-index: 70;
  min-height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.header-shell {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 34px;
}

.brand {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--color-text);
  font: 600 17px/1 var(--font-display);
  letter-spacing: .01em;
}

.brand img {
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
}

.brand-local {
  color: var(--color-text-muted);
  font-weight: 450;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.primary-nav a {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 450;
  white-space: nowrap;
}

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

.primary-nav a[aria-current="page"] {
  font-weight: 650;
}

.header-tools {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.language-menu {
  position: relative;
}

.language-trigger {
  min-width: 44px;
  min-height: 44px;
  padding: 0 10px;
  border: 0;
  background: transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--color-text-muted);
  font-size: 13px;
}

.language-trigger svg {
  width: 10px;
  height: 10px;
  flex: 0 0 10px;
}

.language-list {
  position: absolute;
  top: calc(100% + 7px);
  right: 0;
  z-index: 90;
  width: 160px;
  padding: 7px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-panel);
}

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

.language-list a {
  min-height: 40px;
  padding: 7px 10px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  color: var(--color-text-muted);
}

.language-list a:hover,
.language-list a[aria-current="true"] {
  background: var(--color-panel-muted);
  color: var(--color-text);
}

.btn-login {
  min-height: 36px;
  padding: 0 18px;
  border-radius: var(--radius-pill);
  background: var(--color-accent-dark);
  color: var(--color-on-accent);
  box-shadow: 0 8px 18px -8px var(--color-accent-shadow), inset 0 1px 0 var(--color-highlight-soft);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13.5px;
  font-weight: 650;
}

.btn-login:hover {
  background: var(--color-accent);
  transform: translateY(-1px);
}

.menu-toggle {
  min-width: 44px;
  min-height: 44px;
  padding: 10px;
  border: 0;
  background: transparent;
  display: none;
  align-items: center;
  justify-content: center;
}

.menu-toggle-box {
  width: 21px;
  height: 15px;
  display: grid;
  align-content: space-between;
}

.menu-toggle-box i {
  width: 100%;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-text);
  transition: transform .18s ease, opacity .18s ease;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-box i:first-child {
  transform: translateY(6.5px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-box i:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-box i:last-child {
  transform: translateY(-6.5px) rotate(-45deg);
}

.mobile-nav {
  display: none;
}

.nav-veil {
  position: fixed;
  inset: calc(var(--notice-height) + var(--header-height)) 0 0;
  z-index: 60;
  border: 0;
  background: var(--color-accent-shadow);
}

.nav-veil[hidden] {
  display: none;
}

.site-footer {
  overflow-x: clip;
  border-top: 1px solid var(--color-terminal-border);
  background: var(--color-accent-dark);
  color: var(--color-terminal-text);
}

.footer-grid {
  padding-top: 64px;
  padding-bottom: 46px;
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr .9fr;
  gap: 44px;
}

.footer-brand {
  max-width: 340px;
}

.footer-brand .brand {
  color: var(--color-terminal-text);
}

.footer-brand p {
  margin: 18px 0 0;
  color: var(--color-terminal-muted);
}

.footer-title {
  margin: 0 0 16px;
  color: var(--color-terminal-text);
  font: 600 13px/1.3 var(--font-mono);
  letter-spacing: .04em;
}

.footer-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links li + li {
  margin-top: 7px;
}

.footer-links a {
  min-height: 28px;
  display: inline-flex;
  align-items: center;
  color: var(--color-terminal-muted);
}

.footer-links a:hover {
  color: var(--color-terminal-text);
}

.footer-bottom {
  min-height: 64px;
  padding-top: 18px;
  padding-bottom: 18px;
  border-top: 1px solid var(--color-terminal-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: var(--color-terminal-muted);
  font-size: 12px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.footer-legal a {
  min-height: 24px;
  display: inline-flex;
  align-items: center;
}

.reveal {
  transition: opacity .65s ease, transform .65s ease;
}

.reveal.pending {
  opacity: 0;
  transform: translateY(16px);
}

.reveal.shown {
  opacity: 1;
  transform: none;
}

#server-status {
  position: relative;
  width: 100%;
  max-width: 100%;
  margin-bottom: 32px;
  overflow: hidden;
}

#server-status + * {
  margin-top: 0;
}

.prose {
  color: var(--color-text-muted);
  font-size: 17px;
  line-height: 1.82;
}

.prose h2,
.prose h3,
.prose h4 {
  color: var(--color-text);
}

.prose h2 {
  margin-top: 72px;
}

.prose h3 {
  margin-top: 42px;
}

.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-bright);
  text-underline-offset: 3px;
}

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

.prose img,
.prose iframe {
  max-width: 100%;
}

body:has(.toc-tabs) section[id] {
  scroll-margin-top: var(--toc-offset);
}

@media (max-width: 1180px) {
  .primary-nav {
    gap: 16px;
  }

  .primary-nav a {
    font-size: 13px;
  }

  .footer-grid {
    grid-template-columns: 1.3fr 1fr 1fr;
  }
}

@media (max-width: 980px) {
  .primary-nav {
    display: none;
  }

  .header-tools {
    margin-left: auto;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .mobile-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    z-index: 80;
    max-height: calc(100dvh - var(--notice-height) - var(--header-height));
    padding: 10px var(--gutter) 18px;
    overflow-y: auto;
    overscroll-behavior: contain;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-panel);
    box-shadow: var(--shadow-panel);
  }

  .mobile-nav.is-open {
    display: block;
  }

  .mobile-nav a {
    width: 100%;
    min-height: 46px;
    padding: 10px 8px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    color: var(--color-text-muted);
  }

  .mobile-nav a[aria-current="page"] {
    color: var(--color-text);
    font-weight: 650;
  }

  .mobile-languages {
    padding-top: 10px;
  }

  .mobile-languages strong {
    min-height: 36px;
    display: flex;
    align-items: center;
    color: var(--color-text-muted);
    font: 12px/1.3 var(--font-mono);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --gutter: 22px;
    --section-space: 72px;
  }

  h1 {
    font-size: clamp(32px, 9vw, 40px);
  }

  h2 {
    font-size: clamp(28px, 7vw, 38px);
  }

  .language-menu {
    display: none;
  }

  .footer-grid {
    gap: 34px;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 18px;
  }

  .no-break {
    white-space: normal;
  }

  .notice-link {
    display: none;
  }

  .notice-dots {
    width: 130px;
  }

  .header-shell {
    gap: 10px;
  }

  .brand {
    font-size: 16px;
  }

  .btn-login {
    min-height: 40px;
    padding-inline: 14px;
  }

  .section,
  .hero,
  .preview-hero,
  .promo-block {
    overflow-x: clip;
  }

  .tilt,
  .motion-tilt,
  [class*="tilt-"] {
    transform: none !important;
  }

  .decor,
  .hero-decoration,
  .stripe-halo,
  [data-hero-visual] {
    max-width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-brand {
    max-width: none;
  }

  .prose {
    font-size: 16px;
  }
}

@media (max-width: 360px) {
  :root {
    --gutter: 16px;
  }

  .btn-login {
    padding-inline: 12px;
  }

  .brand img {
    width: 28px;
    height: 28px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  .reveal,
  .reveal.pending {
    opacity: 1;
    transform: none;
  }
}