:root {
  --color-bg: #FCFCFA;
  --color-panel: #F6F6F3;
  --color-panel-strong: #EFF0EC;
  --color-border: #E2E3DE;
  --color-accent: #2E7D46;
  --color-accent-dark: #215C33;
  --color-text: #16181A;
  --color-muted: #5C615D;
  --color-success: #2E7D46;
  --color-warning: #B07A1E;
  --color-error: #B3432F;
  --color-on-accent: #FFFFFF;
  --color-flag-red: #C05243;
  --color-flag-blue: #41639A;
  --color-transparent: transparent;
  --font-display: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Consolas, 'Courier New', monospace;
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --gutter: 32px;
  --content-width: 1240px;
  --reading-width: 56rem;
  --header-height: 72px;
  --toc-offset: 88px;
  --transition-fast: 150ms ease;
  --transition-reveal: 560ms ease;
  --line-thin: 1px;
  --line-strong: 2px;
}

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

html {
  scroll-behavior: smooth;
  background: var(--color-bg);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 0;
  margin: 0;
  overflow-x: clip;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.68;
  text-rendering: optimizeLegibility;
}

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

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

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  border: 0;
}

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

ul,
ol {
  margin: 0;
}

ul[role='list'],
ol[role='list'],
.site-nav-list,
.footer-list,
.hero-trust,
.platform-inline,
.route-board-list {
  padding: 0;
  list-style: none;
}

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

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

h1,
.hero-title {
  max-width: 100%;
  margin-bottom: 22px;
  font-size: clamp(52px, 5.2vw, 72px);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.14;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(32px, 3.4vw, 48px);
  font-weight: 450;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(21px, 2vw, 28px);
  font-weight: 600;
  line-height: 1.3;
}

p {
  margin-bottom: 1.1em;
}

strong {
  font-weight: 650;
}

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

code {
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-text);
  color: var(--color-bg);
  -webkit-overflow-scrolling: touch;
}

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

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

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

.section {
  padding-top: 96px;
  padding-bottom: 96px;
  overflow-x: clip;
}

.section-panel {
  border-block: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 40px;
}

.eyebrow,
.badge,
.tag {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  background: var(--color-bg);
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.badge-dot {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

.tag {
  font-family: var(--font-mono);
  font-size: 11px;
}

.tag-accent {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-on-accent);
}

.nowrap-term {
  white-space: nowrap;
}

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

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

.btn {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: var(--line-thin) solid var(--color-transparent);
  border-radius: var(--radius-sm);
  padding: 12px 30px;
  font-size: 16px;
  font-weight: 650;
  line-height: 1.35;
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  border-color: var(--color-accent-dark);
  background: var(--color-accent-dark);
}

.btn-secondary {
  border-color: var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-small {
  min-height: 42px;
  padding: 8px 18px;
  font-size: 14px;
}

.btn:focus-visible,
.site-nav a:focus-visible,
.language-trigger:focus-visible,
.menu-toggle:focus-visible,
.mobile-drawer a:focus-visible {
  outline: var(--line-strong) solid var(--color-accent);
  outline-offset: 3px;
}

.panel,
.card {
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
}

.card {
  padding: 28px;
}

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

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

.head-inner {
  position: relative;
  display: flex;
  min-height: var(--header-height);
  align-items: center;
}

.brand {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  width: 30px;
  height: 30px;
  flex: none;
}

.brand-name {
  font-size: 17px;
  font-weight: 750;
  letter-spacing: 0.03em;
}

.brand-local {
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 450;
}

.site-nav {
  flex: 1;
  margin-left: 44px;
}

.site-nav-list {
  display: flex;
  align-items: center;
}

.site-nav-list li {
  display: flex;
  align-items: center;
  font-size: 14px;
}

.site-nav-list li + li::before {
  margin-inline: 15px;
  color: var(--color-border);
  content: '·';
  font-weight: 700;
}

.site-nav a {
  border-bottom: var(--line-strong) solid var(--color-transparent);
  padding-block: 4px;
  color: var(--color-muted);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

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

.site-nav a.is-active {
  border-bottom-color: var(--color-accent);
}

.head-tools {
  display: flex;
  flex: none;
  align-items: center;
  gap: 12px;
}

.language-box {
  position: relative;
}

.language-trigger {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 6px;
  padding-inline: 8px;
  background: var(--color-transparent);
  color: var(--color-muted);
  cursor: pointer;
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 70;
  display: none;
  width: 168px;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 6px;
  background: var(--color-bg);
}

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

.language-menu a {
  display: block;
  min-height: 42px;
  border-radius: var(--radius-xs);
  padding: 9px 10px;
  color: var(--color-muted);
}

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

.login-link {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  border: var(--line-thin) solid var(--color-text);
  border-radius: var(--radius-sm);
  padding: 7px 20px;
  font-size: 14px;
  font-weight: 650;
}

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

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  cursor: pointer;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  width: 18px;
  height: var(--line-strong);
  background: var(--color-text);
}

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

.menu-toggle-lines::before,
.menu-toggle-lines::after {
  position: absolute;
  left: 0;
  content: '';
}

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

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

.mobile-drawer {
  position: absolute;
  top: 100%;
  right: 0;
  left: 0;
  z-index: 65;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  border-top: var(--line-thin) solid var(--color-border);
  border-bottom: var(--line-thin) solid var(--color-border);
  padding: 10px var(--gutter) 18px;
  background: var(--color-bg);
  overscroll-behavior: contain;
}

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

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

.mobile-drawer a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  border-bottom: var(--line-thin) solid var(--color-border);
  color: var(--color-muted);
}

.mobile-drawer a.is-active {
  color: var(--color-accent);
}

.mobile-language-title {
  margin: 16px 0 4px;
  color: var(--color-muted);
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.08em;
}

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

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

.site-foot {
  border-top: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
}

.footer-main {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.25fr 1fr;
  gap: 48px;
  padding-top: 68px;
  padding-bottom: 52px;
}

.footer-brand p {
  max-width: 30em;
  margin-top: 18px;
  color: var(--color-muted);
  font-size: 14px;
}

.footer-heading {
  margin-bottom: 16px;
  font-size: 14px;
  font-weight: 700;
}

.footer-list {
  display: grid;
  gap: 9px;
}

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

.footer-list a:hover {
  color: var(--color-accent);
}

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

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

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

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

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

.tilt,
.tilt-soft {
  transform: rotate(-0.45deg);
}

.prose {
  overflow-wrap: break-word;
}

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

.prose blockquote {
  margin-inline: 0;
}

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

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

@media (max-width: 1040px) {
  .site-nav {
    display: none;
  }

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

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

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

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
    --toc-offset: 82px;
  }

  h1,
  .hero-title {
    font-size: clamp(32px, 9.4vw, 40px);
    line-height: 1.15;
  }

  h2 {
    font-size: clamp(28px, 7.5vw, 36px);
  }

  .section {
    padding-top: 72px;
    padding-bottom: 72px;
  }

  .language-box {
    display: none;
  }

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

  .login-link {
    min-height: 38px;
    padding-inline: 14px;
  }

  .section-head {
    align-items: start;
    flex-direction: column;
  }

  .footer-main {
    gap: 36px 24px;
  }
}

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

  body {
    overflow-x: clip;
  }

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

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

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

  .btn {
    padding-inline: 22px;
  }

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

  .brand-local {
    display: none;
  }

  .mobile-drawer {
    padding-inline: var(--gutter);
  }
}

@media (max-width: 360px) {
  .brand-name {
    font-size: 15px;
  }

  .brand-logo {
    width: 27px;
    height: 27px;
  }

  .login-link {
    padding-inline: 10px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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