:root {
  --color-canvas: #F6F0E3;
  --color-surface: #FCF8EE;
  --color-ink: #241C12;
  --color-ink-muted: #6E6250;
  --color-night: #221A11;
  --color-line: #DDD2BC;
  --color-accent: #2E6B4C;
  --color-accent-deep: #1F4E36;
  --color-success: #4C8B5C;
  --color-warning: #B9862D;
  --color-error: #A8392B;
  --color-cream-line: #E9DCC2;
  --color-cream-text: #CFC2A8;
  --color-cream-dot: #F4EAD3;
  --color-white: #FFFFFF;
  --color-flag-red: #BE4234;
  --color-flag-blue: #33518F;
  --color-flag-white: #F7F3E8;
  --color-flag-green: #2E6B4C;
  --color-halo-warm: rgba(185, 134, 45, .14);
  --color-halo-green: rgba(46, 107, 76, .11);
  --color-dot-grid: rgba(36, 28, 18, .055);
  --color-night-line: rgba(233, 220, 194, .16);
  --color-night-soft: rgba(233, 220, 194, .07);
  --color-night-hover: rgba(233, 220, 194, .045);
  --color-overlay: rgba(34, 26, 17, .42);
  --color-focus: #B9862D;
  --font-display: Georgia, 'Times New Roman', 'Songti SC', 'Noto Serif CJK SC', 'Source Han Serif SC', serif;
  --font-body: Inter, 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Consolas, monospace;
  --radius-small: 10px;
  --radius-medium: 16px;
  --radius-large: 28px;
  --radius-pill: 999px;
  --shadow-card: 0 36px 72px -30px rgba(34, 26, 17, .5), 0 14px 26px -14px rgba(34, 26, 17, .3);
  --shadow-button: 0 10px 22px -10px rgba(31, 78, 54, .55);
  --shadow-panel: 0 22px 48px -34px rgba(34, 26, 17, .42);
  --content-width: 1160px;
  --header-width: 1280px;
  --header-height: 70px;
  --gutter: 32px;
  --section-space: 96px;
  --toc-offset: 86px;
  --transition-fast: 180ms ease;
  --transition-reveal: 560ms cubic-bezier(.2, .75, .25, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--toc-offset);
  -webkit-text-size-adjust: 100%;
}

html.nav-open {
  overflow: hidden;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: clip;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body,
button,
input,
select,
textarea {
  font-family: var(--font-body);
}

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

img {
  height: auto;
}

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

button,
summary,
select {
  cursor: pointer;
}

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

p,
h1,
h2,
h3,
h4,
ul,
ol,
dl,
dd,
blockquote,
figure {
  margin-top: 0;
}

ul,
ol {
  padding-left: 1.25rem;
}

nav ul,
.footer-links,
.platform-row,
.route-flags,
.badge-row {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

code {
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-night);
  color: var(--color-cream-dot);
  font-family: var(--font-mono);
  line-height: 1.6;
  -webkit-overflow-scrolling: touch;
}

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

table {
  border-collapse: collapse;
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-line);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--color-ink);
  font-weight: 700;
}

::selection {
  background: var(--color-accent);
  color: var(--color-white);
}

:where(a, button, input, select, textarea, summary, [role="tab"]):focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: calc(var(--content-width) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap-wide {
  width: 100%;
  max-width: calc(var(--header-width) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.section-compact {
  padding-top: 64px;
  padding-bottom: 64px;
  overflow-x: clip;
}

.section-dark {
  background: var(--color-night);
  color: var(--color-cream-dot);
}

.section-heading {
  max-width: 800px;
  margin-bottom: 42px;
}

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

.eyebrow {
  margin-bottom: 12px;
  color: var(--color-accent);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
.display-type {
  font-family: var(--font-display);
  font-weight: 400;
  text-wrap: balance;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(52px, 5.2vw, 72px);
  line-height: 1.12;
  letter-spacing: .01em;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(36px, 4vw, 54px);
  line-height: 1.16;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(24px, 2.3vw, 32px);
  line-height: 1.25;
}

h4 {
  margin-bottom: 10px;
  font-size: 18px;
  line-height: 1.35;
}

.lede {
  max-width: 720px;
  color: var(--color-ink-muted);
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.65;
}

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

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

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

.badge {
  display: inline-flex;
  min-height: 30px;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  padding: 4px 13px;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
}

.badge-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--color-warning);
}

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

.badge-warning {
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.btn,
.btn-primary,
.btn-secondary,
.btn-quiet,
.btn-login {
  display: inline-flex;
  min-width: 24px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: 1.5px solid transparent;
  border-radius: var(--radius-pill);
  font-weight: 650;
  line-height: 1.2;
  text-align: center;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: var(--shadow-button);
}

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

.btn-secondary,
.btn-login {
  border-color: var(--color-ink);
  background: transparent;
  color: var(--color-ink);
}

.btn-secondary:hover,
.btn-login:hover {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-quiet {
  border-color: var(--color-line);
  background: var(--color-surface);
  color: var(--color-ink);
}

.btn-quiet:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-deep);
}

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

.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.panel,
.card {
  min-width: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-large);
  background: var(--color-surface);
  box-shadow: var(--shadow-panel);
}

.panel {
  padding: 30px;
}

.section-dark .panel {
  color: var(--color-ink);
}

.section-dark .panel p {
  color: var(--color-ink-muted);
}

.prose a.btn-primary {
  color: var(--color-white);
  text-decoration: none;
}

.card {
  padding: 26px;
}

.card:hover {
  border-color: var(--color-accent);
}

.split-grid,
.card-grid,
.three-grid,
.two-grid {
  display: grid;
  min-width: 0;
  gap: 24px;
}

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

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

.card-grid {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
}

.split-grid > *,
.card-grid > *,
.three-grid > *,
.two-grid > * {
  min-width: 0;
}

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

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

.reveal.shown {
  opacity: 1;
  transform: translateY(0);
}

.site-head {
  position: relative;
  z-index: 50;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-canvas);
}

.head-inner {
  position: relative;
  display: flex;
  width: 100%;
  max-width: var(--header-width);
  min-height: var(--header-height);
  margin-inline: auto;
  align-items: center;
  gap: 34px;
  padding-inline: var(--gutter);
}

.brand {
  display: inline-flex;
  min-width: 0;
  min-height: 44px;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 21px;
  letter-spacing: .03em;
}

.brand-local {
  color: var(--color-ink-muted);
  font-size: 13px;
  font-weight: 500;
}

.desktop-nav {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 26px;
}

.desktop-nav a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--color-ink-muted);
  font-size: 14px;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

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

.desktop-nav a.is-active {
  font-weight: 700;
}

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

.lang-control {
  position: relative;
}

.lang-button,
.menu-toggle {
  min-width: 44px;
  min-height: 44px;
  border: 0;
  background: transparent;
  color: var(--color-ink-muted);
}

.lang-button {
  padding-inline: 8px;
  white-space: nowrap;
}

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 70;
  display: none;
  width: 174px;
  padding: 8px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.lang-control.is-open .lang-menu {
  display: block;
}

.lang-menu a {
  display: flex;
  min-height: 44px;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-small);
  color: var(--color-ink-muted);
}

.lang-menu a:hover,
.lang-menu a[aria-current="true"] {
  background: var(--color-canvas);
  color: var(--color-ink);
}

.menu-toggle {
  display: none;
  padding: 8px;
  border: 1px solid var(--color-line);
  border-radius: 50%;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-ink);
  content: "";
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.menu-toggle-lines {
  position: relative;
}

.menu-toggle-lines::before {
  position: absolute;
  top: -6px;
}

.menu-toggle-lines::after {
  position: absolute;
  top: 6px;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::before {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::after {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-nav {
  position: absolute;
  top: 100%;
  right: var(--gutter);
  left: var(--gutter);
  z-index: 65;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 12px;
  border: 1px solid var(--color-line);
  border-radius: 0 0 var(--radius-large) var(--radius-large);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

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

.mobile-nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 46px;
  align-items: center;
  padding: 10px 14px;
  border-radius: var(--radius-small);
  color: var(--color-ink-muted);
}

.mobile-nav a:hover,
.mobile-nav a.is-active,
.mobile-nav a[aria-current="true"] {
  background: var(--color-canvas);
  color: var(--color-ink);
}

.mobile-language-list {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--color-line);
}

.nav-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 40;
  display: none;
  border: 0;
  background: var(--color-overlay);
}

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

.site-footer {
  overflow-x: clip;
  background: var(--color-night);
  color: var(--color-cream-text);
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(240px, 1.35fr) repeat(3, minmax(160px, 1fr));
  gap: 46px;
  padding-top: 72px;
  padding-bottom: 54px;
}

.footer-brand .brand-name {
  color: var(--color-cream-dot);
}

.footer-brand p {
  max-width: 360px;
  margin-top: 18px;
  color: var(--color-cream-text);
}

.footer-title {
  margin-bottom: 16px;
  color: var(--color-cream-dot);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
}

.footer-links {
  display: grid;
  gap: 4px;
}

.footer-links a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  color: var(--color-cream-text);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-cream-dot);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 26px;
  padding-top: 22px;
  padding-bottom: 30px;
  border-top: 1px solid var(--color-night-line);
  font-size: 13px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-legal a {
  min-height: 24px;
}

.footer-copyright {
  margin-right: auto;
}

.prose {
  max-width: 780px;
  font-size: 17px;
}

.prose > * {
  min-width: 0;
}

.prose h2,
.prose h3 {
  scroll-margin-top: var(--toc-offset);
}

.prose h2 {
  margin-top: 64px;
}

.prose h3 {
  margin-top: 38px;
}

.prose p,
.prose li {
  color: var(--color-ink-muted);
}

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

.prose img {
  border-radius: var(--radius-medium);
}

.prose blockquote {
  margin-inline: 0;
}

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

@media (max-width: 1160px) {
  .desktop-nav {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

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

@media (max-width: 900px) {
  :root {
    --section-space: 76px;
  }

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

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

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
    --header-height: 64px;
    --toc-offset: 78px;
  }

  h1 {
    font-size: clamp(28px, 9.5vw, 40px);
    line-height: 1.14;
  }

  h2 {
    font-size: clamp(30px, 8vw, 40px);
  }

  .split-grid,
  .two-grid,
  .three-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .head-inner {
    min-height: var(--header-height);
    gap: 10px;
  }

  .brand-local,
  .lang-button {
    display: none;
  }

  .btn-login {
    min-height: 40px;
    padding: 9px 17px;
  }

  .header-tools {
    margin-left: auto;
    gap: 8px;
  }

  .footer-main {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --section-space: 64px;
  }

  body {
    overflow-x: clip;
  }

  .wrap,
  .wrap-wide {
    padding-inline: var(--gutter);
  }

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

  .panel,
  .card {
    padding: 22px;
  }

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

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

  .mobile-nav {
    right: var(--gutter);
    left: var(--gutter);
  }

  .absolute-decor,
  [class*="watermark"],
  [class*="decor-text"] {
    display: none;
  }
}

@media (max-width: 380px) {
  .brand-local {
    display: none;
  }

  .brand-name {
    font-size: 18px;
  }

  .brand-logo {
    width: 31px;
    height: 31px;
  }

  .btn-login {
    padding-inline: 13px;
  }
}

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

  .btn-primary:hover {
    transform: none;
  }
}