:root {
  --color-canvas: #FFFFFF;
  --color-panel: #F7F7F7;
  --color-panel-strong: #EFEFEF;
  --color-line: #E3E3E3;
  --color-ink: #0B0B0C;
  --color-ink-soft: #3A3A3E;
  --color-black: #000000;
  --color-accent: #111114;
  --color-muted: #5B5B60;
  --color-success: #4CA30D;
  --color-warning: #E08700;
  --color-error: #E5321F;
  --color-orange: #FF7A1A;
  --color-lime: #B9E92B;
  --color-red: #F13B2E;
  --color-pink: #E14FB2;
  --color-lime-soft: #EFFACC;
  --color-flag-blue: #20418F;
  --color-flag-edge: rgba(11, 11, 12, .16);
  --color-overlay: rgba(0, 0, 0, .38);
  --color-focus: rgba(17, 17, 20, .16);
  --font-display: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Consolas, monospace;
  --radius-xs: 5px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-pill: 999px;
  --border-thin: 1px solid var(--color-line);
  --border-strong: 1.5px solid var(--color-accent);
  --content-wide: 1376px;
  --content-main: 1160px;
  --content-reading: 912px;
  --header-height: 72px;
  --toc-top: 80px;
  --gutter: clamp(16px, 4vw, 32px);
  --section-space: clamp(64px, 9vw, 112px);
  --transition-fast: 160ms ease;
  --transition-main: 280ms ease;
}

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

html {
  overflow-x: clip;
  scroll-behavior: smooth;
  background: var(--color-canvas);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

main,
section,
article,
aside,
header,
footer,
nav,
div {
  min-width: 0;
}

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

img {
  height: auto;
}

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

button,
summary {
  cursor: pointer;
}

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

ul,
ol {
  margin: 0;
}

p,
h1,
h2,
h3,
h4,
figure,
blockquote,
pre {
  margin-top: 0;
}

p:last-child {
  margin-bottom: 0;
}

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

:not(pre) > code {
  overflow-wrap: anywhere;
  border: var(--border-thin);
  border-radius: var(--radius-xs);
  background: var(--color-panel);
  padding: .12em .38em;
  font-size: .9em;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  color: var(--color-canvas);
  padding: 20px;
  line-height: 1.65;
}

pre code {
  white-space: pre;
  overflow-wrap: normal;
}

table {
  border-collapse: collapse;
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

::selection {
  background: var(--color-lime);
  color: var(--color-black);
}

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

.wrap {
  max-width: calc(var(--content-main) + var(--gutter) + var(--gutter));
}

.wrap-wide {
  max-width: calc(var(--content-wide) + var(--gutter) + var(--gutter));
}

.reading-wrap {
  max-width: calc(var(--content-reading) + var(--gutter) + var(--gutter));
}

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

.section-compact {
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(40px, 6vw, 72px);
}

.eyebrow,
.mono-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}

.eyebrow::before {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 2px;
  background: var(--color-orange);
  content: "";
}

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

h1,
.hero-title {
  max-width: 100%;
  font-size: clamp(52px, 5.2vw, 72px);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.1;
}

h2 {
  font-size: clamp(34px, 4vw, 52px);
  font-weight: 850;
  letter-spacing: -.018em;
  line-height: 1.15;
}

h3 {
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 800;
  line-height: 1.25;
}

.title-phrase {
  white-space: nowrap;
}

.lead {
  max-width: 720px;
  color: var(--color-muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.7;
}

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

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

.panel,
.card {
  border: var(--border-strong);
  border-radius: var(--radius-md);
  background: var(--color-canvas);
}

.panel-soft {
  border: var(--border-thin);
  border-radius: var(--radius-md);
  background: var(--color-panel);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.btn,
.btn-primary,
.btn-secondary,
.btn-quiet {
  display: inline-flex;
  min-height: 48px;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-pill);
  padding: 10px 24px;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn-primary {
  border: var(--border-strong);
  background: var(--color-accent);
  color: var(--color-canvas);
}

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

.btn-secondary {
  border: var(--border-strong);
  background: var(--color-canvas);
  color: var(--color-ink);
}

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

.btn-quiet {
  border: var(--border-thin);
  background: var(--color-panel);
  color: var(--color-ink);
}

.btn[aria-disabled="true"],
.btn:disabled {
  cursor: not-allowed;
  opacity: .52;
  transform: none;
}

.badge,
.chip,
.tag {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 7px;
  overflow: hidden;
  border: var(--border-thin);
  border-radius: var(--radius-pill);
  padding: 5px 11px;
  background: var(--color-canvas);
  color: var(--color-ink-soft);
  font-size: 13px;
  line-height: 1.35;
  text-overflow: ellipsis;
}

.badge-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 2px;
  background: var(--color-orange);
}

.badge-lime .badge-dot {
  background: var(--color-lime);
}

.badge-red .badge-dot {
  background: var(--color-red);
}

.badge-pink .badge-dot {
  background: var(--color-pink);
}

.reveal {
  transition: opacity var(--transition-main), transform var(--transition-main);
}

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

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

.site-header {
  position: relative;
  z-index: 100;
  height: var(--header-height);
  border-bottom: var(--border-thin);
  background: var(--color-canvas);
}

.site-header__inner {
  position: relative;
  display: flex;
  width: 100%;
  max-width: var(--content-wide);
  height: 100%;
  align-items: center;
  gap: 26px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
}

.site-brand img {
  width: 30px;
  height: 30px;
}

.site-brand__word {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 850;
  letter-spacing: -.01em;
}

.site-brand__local {
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 600;
}

.desktop-nav {
  display: flex;
  height: var(--header-height);
  flex: 1 1 auto;
  align-items: stretch;
  gap: 2px;
}

.desktop-nav a {
  position: relative;
  display: flex;
  align-items: center;
  padding-inline: 10px;
  color: var(--color-ink-soft);
  font-size: 13.5px;
  font-weight: 550;
  white-space: nowrap;
}

.desktop-nav a:hover,
.desktop-nav a.is-active {
  color: var(--color-black);
}

.desktop-nav a.is-active {
  font-weight: 750;
}

.desktop-nav a.is-active::after {
  position: absolute;
  right: 10px;
  bottom: -1px;
  left: 10px;
  height: 3px;
  border-radius: var(--radius-xs);
  background: var(--color-accent);
  content: "";
}

.header-tools {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
}

.header-login {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  border: var(--border-strong);
  border-radius: var(--radius-pill);
  padding: 7px 18px;
  background: var(--color-canvas);
  font-size: 14px;
  font-weight: 700;
}

.header-login:hover {
  background: var(--color-panel);
}

.language-switch {
  position: relative;
}

.language-trigger,
.menu-toggle {
  border: 0;
  background: var(--color-canvas);
}

.language-trigger {
  min-height: 38px;
  padding: 7px 8px;
  color: var(--color-muted);
  font-size: 13px;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  display: none;
  width: 170px;
  border: var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  padding: 6px;
}

.language-switch.is-open .language-menu {
  display: block;
}

.language-menu a {
  display: flex;
  min-height: 42px;
  align-items: center;
  border-radius: var(--radius-xs);
  padding: 8px 10px;
  font-size: 14px;
}

.language-menu a:hover,
.language-menu a[aria-current="true"] {
  background: var(--color-panel);
  font-weight: 700;
}

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: var(--border-strong);
  border-radius: var(--radius-pill);
}

.menu-toggle svg {
  width: 20px;
  height: 20px;
}

.mobile-nav {
  position: absolute;
  z-index: 103;
  top: var(--header-height);
  right: 0;
  left: 0;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  border-bottom: var(--border-strong);
  background: var(--color-canvas);
  padding: 10px var(--gutter) 18px;
}

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

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  border-bottom: var(--border-thin);
  padding: 11px 4px;
  font-weight: 650;
}

.mobile-nav a.is-active {
  box-shadow: inset 4px 0 0 var(--color-lime);
  padding-left: 14px;
}

.mobile-nav__languages {
  margin-top: 12px;
  border-top: var(--border-strong);
  padding-top: 8px;
}

.nav-veil {
  position: fixed;
  z-index: 90;
  inset: var(--header-height) 0 0;
  display: none;
  background: var(--color-overlay);
}

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

.site-footer {
  border-top: var(--border-strong);
  background: var(--color-canvas);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.25fr) repeat(3, minmax(150px, 1fr));
  gap: 42px;
  padding-top: 64px;
  padding-bottom: 44px;
}

.footer-brand {
  max-width: 330px;
}

.footer-brand__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-size: 18px;
  font-weight: 850;
}

.footer-brand__head img {
  width: 32px;
  height: 32px;
}

.footer-title {
  margin-bottom: 14px;
  font-size: 13px;
  font-weight: 800;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-links a {
  color: var(--color-muted);
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--color-black);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-top: var(--border-thin);
  padding-top: 20px;
  padding-bottom: 24px;
  color: var(--color-muted);
  font-size: 13px;
}

.footer-legal,
.footer-languages {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.prose {
  color: var(--color-ink-soft);
}

.prose > * {
  max-width: 100%;
}

.prose h2 {
  margin-top: 2.1em;
  margin-bottom: .7em;
}

.prose h3 {
  margin-top: 1.7em;
  margin-bottom: .6em;
}

.prose p,
.prose li {
  overflow-wrap: break-word;
}

.prose li + li {
  margin-top: .45em;
}

.prose a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.prose blockquote {
  margin-inline: 0;
}

.decorated-section,
.hero-shell {
  position: relative;
  overflow-x: clip;
}

.tilt-card {
  transform: rotate(-.45deg);
}

body:has(.toc-tabs) section[id] {
  scroll-margin-top: calc(var(--toc-top) + 72px);
}

@media (max-width: 1180px) {
  .desktop-nav a {
    padding-inline: 7px;
    font-size: 12.5px;
  }

  .site-header__inner {
    gap: 16px;
  }
}

@media (max-width: 980px) {
  .title-phrase {
    white-space: normal;
  }

  .desktop-nav,
  .language-switch {
    display: none;
  }

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

  .menu-toggle {
    display: inline-flex;
    flex: 0 0 44px;
    visibility: visible;
  }

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

@media (max-width: 768px) {
  :root {
    --header-height: 64px;
    --toc-top: 70px;
  }

  h1,
  .hero-title {
    font-size: clamp(32px, 9vw, 40px);
    line-height: 1.12;
  }

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

  .site-brand__local {
    display: none;
  }

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
  }

  body {
    overflow-x: clip;
  }

  .wrap,
  .wrap-wide,
  .reading-wrap {
    width: 100%;
    padding-inline: var(--gutter);
  }

  .button-row {
    align-items: stretch;
    flex-direction: column;
  }

  .button-row .btn,
  .button-row .btn-primary,
  .button-row .btn-secondary {
    width: 100%;
  }

  .site-header__inner {
    padding-inline: var(--gutter);
  }

  .title-phrase {
    white-space: normal;
  }

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

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

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 30px;
    padding-top: 48px;
  }

  .prose > .data-table {
    display: block;
    max-width: 100%;
    min-width: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

@media (max-width: 380px) {
  .site-brand__word {
    font-size: 15px;
  }

  .header-tools {
    gap: 6px;
  }

  .header-login {
    padding-inline: 11px;
  }
}

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

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

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