:root {
  --color-canvas: #FFFFFF;
  --color-surface: #F5F6F4;
  --color-surface-raised: #FFFFFF;
  --color-ink-panel: #191C1A;
  --color-ink-lift: #252B25;
  --color-ink-deep: #131614;
  --color-border: #E3E6E1;
  --color-accent: #A4E520;
  --color-accent-strong: #6E9E0B;
  --color-text: #17191C;
  --color-text-muted: #5C6260;
  --color-success: #2FA84F;
  --color-warning: #E8A13C;
  --color-error: #D64545;
  --color-white: #FFFFFF;
  --color-black: #000000;
  --color-line-ghost: #79817A;
  --color-guide: rgba(255, 255, 255, .09);
  --color-guide-faint: rgba(255, 255, 255, .045);
  --color-stem: rgba(255, 255, 255, .24);
  --color-tag-bg: #22271F;
  --color-tag-border: #39412F;
  --color-tag-text: #CBD3C3;
  --color-on-dark: #FFFFFF;
  --color-on-dark-soft: rgba(255, 255, 255, .72);
  --color-on-dark-faint: rgba(255, 255, 255, .48);
  --color-ghost-border: rgba(255, 255, 255, .28);
  --color-chip-border: rgba(255, 255, 255, .16);
  --color-chip-text: rgba(255, 255, 255, .72);
  --color-arrow-rivet: rgba(25, 28, 26, .55);
  --color-banner-topline: rgba(255, 255, 255, .07);
  --color-overlay: rgba(19, 22, 20, .55);
  --color-shadow-soft: rgba(23, 25, 28, .05);
  --color-shadow-mid: rgba(23, 25, 28, .10);
  --color-shadow-banner: rgba(23, 25, 28, .42);
  --color-shadow-accent: rgba(110, 158, 11, .55);
  --color-shadow-accent-hover: rgba(110, 158, 11, .62);
  --color-accent-wash: rgba(164, 229, 32, .14);
  --color-accent-ring: rgba(164, 229, 32, .34);
  --color-success-wash: rgba(47, 168, 79, .12);
  --color-warning-wash: rgba(232, 161, 60, .14);
  --color-error-wash: rgba(214, 69, 69, .12);
  --color-flag-red: #D43C3C;
  --color-flag-navy: #31427C;
  --color-flag-blue: #2A5CA8;
  --color-flag-white: #FFFFFF;
  --color-flag-yellow: #F4CA42;

  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;

  --radius-xs: 8px;
  --radius-sm: 14px;
  --radius-card: 24px;
  --radius-banner: 36px;
  --radius-pill: 999px;

  --shadow-card: 0 1px 2px var(--color-shadow-soft), 0 10px 28px -8px var(--color-shadow-mid);
  --shadow-banner: 0 32px 64px -30px var(--color-shadow-banner);
  --shadow-button: 0 8px 20px -8px var(--color-shadow-accent);

  --header-height: 72px;
  --content-width: 1200px;
  --reading-width: 820px;
  --gutter: clamp(16px, 3vw, 32px);
  --section-space: clamp(64px, 9vw, 112px);
  --transition-fast: 150ms ease;
  --transition-reveal: 560ms cubic-bezier(.2, .7, .2, 1);
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--color-canvas);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.68;
  text-rendering: optimizeLegibility;
}

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

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

svg[aria-hidden="true"] {
  flex-shrink: 0;
}

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

button {
  border: 0;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration-thickness: .08em;
  text-underline-offset: .18em;
}

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

p:last-child,
ul:last-child,
ol:last-child,
dl:last-child,
figure:last-child,
blockquote:last-child,
pre:last-child {
  margin-bottom: 0;
}

ul,
ol {
  padding-left: 1.35em;
}

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

code {
  border-radius: var(--radius-xs);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: .9em;
  padding: .12em .4em;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border: 1px solid var(--color-tag-border);
  border-radius: var(--radius-sm);
  background: var(--color-ink-panel);
  color: var(--color-tag-text);
  padding: 20px;
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}

pre code {
  display: block;
  min-width: max-content;
  padding: 0;
  background: transparent;
  color: inherit;
  overflow-wrap: normal;
}

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

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

th {
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: 750;
}

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

:focus-visible {
  outline: 2px solid var(--color-accent-strong);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: calc(var(--content-width) + var(--gutter) * 2);
  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: var(--section-space);
  padding-bottom: var(--section-space);
}

.section-compact {
  padding-top: clamp(44px, 6vw, 72px);
  padding-bottom: clamp(44px, 6vw, 72px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.eyebrow {
  margin-bottom: 10px;
  color: var(--color-accent-strong);
  font-family: var(--font-mono);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.18;
  text-wrap: balance;
}

h1 {
  margin-bottom: 20px;
  font-size: clamp(34px, 4.2vw, 48px);
  letter-spacing: -.02em;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(28px, 3.2vw, 40px);
  letter-spacing: -.018em;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(20px, 2vw, 26px);
  letter-spacing: -.012em;
}

h4 {
  margin-bottom: 8px;
  font-size: 1.05rem;
}

.heading-lock {
  white-space: nowrap;
}

.lede {
  color: var(--color-text-muted);
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.75;
}

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

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

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

.on-dark-accent {
  color: var(--color-accent);
}

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

.card {
  padding: clamp(22px, 3vw, 32px);
}

.card--white {
  background: var(--color-surface-raised);
  color: var(--color-text);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  padding: 11px 24px;
  color: var(--color-text);
  font-weight: 750;
  line-height: 1.25;
  text-align: center;
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.button svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.button:hover {
  transform: translateY(-2px);
}

.button--primary {
  background: var(--color-accent);
  color: var(--color-ink-panel);
  box-shadow: var(--shadow-button);
}

.button--primary:hover {
  box-shadow: 0 12px 26px -8px var(--color-shadow-accent-hover);
}

.button--secondary {
  border-color: var(--color-border);
  background: var(--color-canvas);
  color: var(--color-text);
}

.button--secondary:hover {
  border-color: var(--color-text-muted);
  background: var(--color-surface);
}

.button--dark-ghost {
  border-color: var(--color-ghost-border);
  background: transparent;
  color: var(--color-on-dark);
}

.button--dark-ghost:hover {
  border-color: var(--color-on-dark);
}

.button[disabled],
.button.is-disabled {
  cursor: not-allowed;
  opacity: .52;
  transform: none;
}

.chip-row,
.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip,
.badge {
  display: inline-flex;
  max-width: 100%;
  min-height: 30px;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 5px 11px;
  background: var(--color-canvas);
  color: var(--color-text);
  font-size: .82rem;
  font-weight: 650;
  line-height: 1.3;
}

.chip svg,
.badge svg,
.status-dot {
  flex-shrink: 0;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

.badge--success {
  border-color: var(--color-success);
  background: var(--color-success-wash);
  color: var(--color-text);
}

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

.badge--error {
  border-color: var(--color-error);
  background: var(--color-error-wash);
  color: var(--color-text);
}

.badge--accent {
  border-color: var(--color-accent-strong);
  background: var(--color-accent-wash);
  color: var(--color-text);
}

.site-header {
  position: relative;
  z-index: 80;
  height: var(--header-height);
  background: var(--color-canvas);
  color: var(--color-text);
}

.header-shell {
  display: flex;
  width: 100%;
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  align-items: center;
  gap: 20px;
}

.site-brand {
  display: inline-flex;
  min-width: max-content;
  align-items: center;
  gap: 11px;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
  text-decoration: none;
}

.site-brand img {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.desktop-nav {
  display: flex;
  margin-left: auto;
  align-items: center;
  gap: 2px;
}

.desktop-nav a {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 7px;
  border-radius: var(--radius-pill);
  padding: 9px 14px;
  color: var(--color-text-muted);
  font-size: .91rem;
  font-weight: 650;
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.desktop-nav a:hover,
.desktop-nav a.active {
  background: var(--color-surface);
  color: var(--color-text);
}

.nav-icon {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.header-tools {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
}

.language-trigger,
.menu-trigger {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-canvas);
  color: var(--color-text);
}

.language-trigger {
  gap: 7px;
  padding: 8px 14px;
  font-size: .84rem;
  font-weight: 650;
}

.language-trigger:hover,
.menu-trigger:hover {
  border-color: var(--color-text-muted);
  background: var(--color-surface);
}

.language-short {
  display: none;
}

.language-menu {
  position: absolute;
  z-index: 95;
  top: calc(100% + 9px);
  right: 0;
  display: none;
  width: 180px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  color: var(--color-text);
  box-shadow: var(--shadow-card);
}

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

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 10px 14px;
  color: var(--color-text);
  font-size: .88rem;
  text-decoration: none;
}

.language-menu a:hover,
.language-menu a.current {
  background: var(--color-surface);
  color: var(--color-text);
}

.menu-trigger {
  display: none;
  min-width: 44px;
  padding: 0;
}

.menu-trigger-lines,
.menu-trigger-lines::before,
.menu-trigger-lines::after {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-text);
}

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

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

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

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

.mobile-veil {
  position: fixed;
  z-index: 60;
  inset: var(--header-height) 0 0;
  display: none;
  background: var(--color-overlay);
}

.mobile-veil.open {
  display: block;
}

.mobile-drawer {
  position: fixed;
  z-index: 90;
  top: var(--header-height);
  right: 0;
  left: 0;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  border-top: 1px solid var(--color-border);
  background: var(--color-canvas);
  color: var(--color-text);
  padding: 12px var(--gutter) 22px;
  box-shadow: var(--shadow-card);
}

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

.mobile-drawer a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  gap: 10px;
  border-radius: var(--radius-sm);
  padding: 11px 13px;
  color: var(--color-text);
  font-weight: 650;
  text-decoration: none;
}

.mobile-drawer a:hover,
.mobile-drawer a.active {
  background: var(--color-surface);
  color: var(--color-text);
}

.mobile-language-list {
  margin-top: 12px;
  border-top: 1px solid var(--color-border);
  padding-top: 12px;
}

.mobile-language-label {
  margin: 0 13px 5px;
  color: var(--color-text-muted);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .08em;
}

.site-footer {
  margin-top: var(--section-space);
  background: var(--color-ink-panel);
  color: var(--color-on-dark);
}

.footer-shell {
  display: grid;
  width: 100%;
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  margin-inline: auto;
  padding: 64px var(--gutter) 28px;
  grid-template-columns: minmax(250px, 1.45fr) repeat(3, minmax(150px, 1fr));
  gap: 44px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--color-on-dark);
  font-size: 1.05rem;
  font-weight: 800;
  text-decoration: none;
}

.footer-brand img {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

.footer-about {
  max-width: 30em;
  margin-top: 16px;
  color: var(--color-on-dark-soft);
  font-size: .91rem;
}

.footer-title {
  margin-bottom: 14px;
  color: var(--color-on-dark);
  font-size: .85rem;
  font-weight: 750;
  letter-spacing: .06em;
}

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

.footer-links a {
  color: var(--color-on-dark-soft);
  font-size: .9rem;
  text-decoration: none;
}

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

.footer-bottom {
  display: flex;
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  margin-inline: auto;
  padding: 22px var(--gutter) 28px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-top: 1px solid var(--color-chip-border);
  color: var(--color-on-dark-soft);
  font-size: .82rem;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-legal a {
  color: var(--color-on-dark-soft);
  text-decoration: none;
}

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

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--transition-reveal), transform var(--transition-reveal);
}

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

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

.prose h2 {
  margin-top: 2.4em;
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.prose h3 {
  margin-top: 1.8em;
  scroll-margin-top: calc(var(--header-height) + 24px);
}

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

.prose a {
  color: var(--color-accent-strong);
  font-weight: 650;
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  -webkit-overflow-scrolling: touch;
}

.table-wrap table {
  min-width: 640px;
  margin-bottom: 0;
}

.tilt {
  transform: rotate(-.35deg);
}

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

.decorated-section > .decoration {
  position: absolute;
  pointer-events: none;
}

@media (max-width: 960px) {
  .desktop-nav a span {
    display: none;
  }

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

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

@media (max-width: 768px) {
  h1 {
    font-size: clamp(24px, 7.5vw, 30px);
    line-height: 1.16;
  }

  h2 {
    font-size: clamp(24px, 7vw, 32px);
  }

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

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

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

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

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

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

  .footer-shell > :first-child {
    grid-column: 1 / -1;
  }
}

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

  .site-brand {
    min-width: 0;
    font-size: .94rem;
  }

  .site-brand img {
    width: 32px;
    height: 32px;
  }

  .header-shell {
    gap: 9px;
  }

  .language-trigger {
    min-width: 52px;
    padding-inline: 11px;
  }

  .button-row {
    align-items: stretch;
  }

  .button-row .button {
    flex: 1 1 150px;
  }

  .chip-row,
  .badge-row {
    flex-direction: row;
    align-items: center;
  }

  .tilt {
    transform: none;
  }

  .footer-shell {
    grid-template-columns: 1fr;
    padding-top: 48px;
  }

  .footer-shell > :first-child {
    grid-column: auto;
  }

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

  th,
  td {
    padding: 12px;
  }
}

@media (max-width: 380px) {
  .site-brand span {
    max-width: 108px;
    line-height: 1.15;
  }

  .language-trigger {
    min-width: 46px;
    padding-inline: 9px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0s !important;
    animation-duration: 0s !important;
    animation-iteration-count: 1 !important;
  }

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