:root {
  --color-canvas: #FFFFFF;
  --color-panel: #F7F7F6;
  --color-panel-strong: #EFEFED;
  --color-border: #E3E3E0;
  --color-accent: #E8890B;
  --color-accent-dark: #B4690A;
  --color-text: #17171A;
  --color-text-muted: #5D5D63;
  --color-success: #188A4C;
  --color-warning: #B45309;
  --color-error: #D5382E;
  --color-on-accent: #FFFFFF;
  --color-overlay: rgba(23, 23, 26, .38);
  --color-shadow-soft: rgba(23, 23, 26, .06);
  --color-shadow-edge: rgba(23, 23, 26, .04);
  --color-shadow-button: rgba(232, 137, 11, .22);
  --color-flag-red: #CE3B30;
  --color-flag-blue: #31549B;
  --color-flag-navy: #232F5E;
  --color-flag-white: #FFFFFF;
  --color-flag-yellow: #F2C94C;
  --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', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --shadow-cell: 0 1px 2px var(--color-shadow-edge);
  --shadow-soft: 0 1px 2px var(--color-shadow-edge), 0 10px 28px var(--color-shadow-soft);
  --shadow-accent: 0 1px 2px var(--color-shadow-edge), 0 6px 16px var(--color-shadow-button);
  --content-max: 1216px;
  --reading-max: 760px;
  --gutter: 32px;
  --header-height: 64px;
  --toc-height: 58px;
  --motion-fast: 150ms;
  --motion-normal: 420ms;
  --section-space: 96px;
}

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

html {
  min-width: 320px;
  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-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

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

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

button,
summary {
  cursor: pointer;
}

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

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

p:last-child,
ul:last-child,
ol:last-child {
  margin-bottom: 0;
}

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

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

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  -webkit-overflow-scrolling: touch;
}

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

::selection {
  background: var(--color-panel-strong);
  color: var(--color-text);
}

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

.reading-wrap {
  width: 100%;
  max-width: calc(var(--reading-max) + 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: 56px;
  padding-bottom: 56px;
}

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

.eyebrow,
.mono-label {
  font-family: var(--font-mono);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

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

h1,
.display-title {
  max-width: 920px;
  margin-bottom: 22px;
  font-size: clamp(52px, 5.2vw, 72px);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.1;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(32px, 3.5vw, 48px);
  font-weight: 900;
  letter-spacing: -.018em;
  line-height: 1.14;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 800;
  line-height: 1.25;
}

.lead {
  max-width: 780px;
  color: var(--color-text-muted);
  font-size: clamp(17px, 1.8vw, 20px);
}

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

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

.badge,
.hero-badge,
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  padding: 5px 12px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .07em;
}

.badge-dot,
.b-dot,
.status-dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--color-success);
}

.status-dot.accent {
  background: var(--color-accent);
}

.button,
.btn-primary,
.btn-secondary,
.btn-login {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 12px 26px;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  transition: transform var(--motion-fast), background var(--motion-fast), border-color var(--motion-fast);
}

.button svg,
.btn-primary svg,
.btn-secondary svg {
  width: 17px;
  height: 17px;
  flex: 0 0 auto;
}

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

.button-primary:hover,
.btn-primary:hover {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
}

.button-secondary,
.btn-secondary,
.btn-login {
  border-color: var(--color-border);
  background: var(--color-canvas);
  color: var(--color-text);
  box-shadow: var(--shadow-cell);
}

.button-secondary:hover,
.btn-secondary:hover,
.btn-login:hover {
  border-color: var(--color-text-muted);
  transform: translateY(-1px);
}

.button-small {
  min-height: 38px;
  padding: 8px 17px;
  border-radius: var(--radius-sm);
  font-size: 13px;
}

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

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

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

.card-pad {
  padding: 26px;
}

.card-lift {
  transition: transform var(--motion-fast), box-shadow var(--motion-fast);
}

.card-lift:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
}

.site-header {
  position: relative;
  z-index: 80;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-canvas);
}

.header-inner {
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  gap: 26px;
}

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

.brand-mark {
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
}

.brand-copy {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 850;
  letter-spacing: -.01em;
}

.brand-local {
  color: var(--color-text-muted);
  font-size: 12px;
  font-weight: 500;
}

.main-nav {
  display: flex;
  min-width: 0;
  flex: 1;
  align-items: center;
  gap: 3px;
}

.main-nav a {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 6px;
  padding: 7px 9px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 13px;
  white-space: nowrap;
  transition: color var(--motion-fast), background var(--motion-fast);
}

.main-nav a svg {
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
}

.main-nav a:hover {
  background: var(--color-panel);
  color: var(--color-text);
}

.main-nav a.active {
  color: var(--color-text);
  font-weight: 700;
}

.header-tools {
  position: relative;
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 9px;
}

.lang-menu {
  position: relative;
}

.lang-trigger {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  gap: 6px;
  border: 0;
  border-radius: var(--radius-sm);
  padding: 7px 9px;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 13px;
}

.lang-trigger:hover {
  background: var(--color-panel);
  color: var(--color-text);
}

.lang-trigger svg {
  width: 10px;
  height: 10px;
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 95;
  display: none;
  min-width: 150px;
  padding: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
  box-shadow: var(--shadow-soft);
}

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

.lang-dropdown a {
  display: flex;
  min-height: 40px;
  align-items: center;
  border-radius: var(--radius-xs);
  padding: 8px 10px;
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.btn-login {
  min-height: 38px;
  padding: 8px 18px;
  font-size: 13px;
}

.menu-toggle {
  display: none;
  width: 44px;
  min-width: 44px;
  height: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-canvas);
}

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

.mobile-nav {
  position: absolute;
  top: 100%;
  right: 0;
  left: 0;
  z-index: 94;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 10px var(--gutter) 18px;
  background: var(--color-canvas);
}

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

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 46px;
  align-items: center;
  gap: 10px;
  border-radius: var(--radius-sm);
  padding: 11px 12px;
  color: var(--color-text-muted);
}

.mobile-nav a svg {
  width: 17px;
  height: 17px;
  flex: 0 0 auto;
}

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

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

.mobile-language-list a {
  font-size: 13px;
}

.nav-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 70;
  display: none;
  border: 0;
  background: var(--color-overlay);
}

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

.site-footer {
  margin-top: 80px;
  border-top: 1px solid var(--color-border);
  background: var(--color-panel);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(220px, 1.35fr) repeat(3, minmax(140px, 1fr));
  gap: 48px;
  padding-top: 58px;
  padding-bottom: 42px;
}

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

.footer-brand .brand {
  margin-bottom: 16px;
}

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

.footer-title {
  margin-bottom: 15px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--color-text);
}

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

.footer-links a {
  color: var(--color-text-muted);
  font-size: 13.5px;
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-top: 20px;
  padding-bottom: 24px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 12.5px;
}

.footer-legal,
.footer-languages {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
}

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

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

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

.prose {
  min-width: 0;
}

.prose h2,
.prose h3 {
  scroll-margin-top: 96px;
}

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

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

.prose a.button-primary {
  color: var(--color-on-accent);
  text-decoration: none;
}

.prose img {
  height: auto;
}

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

@media (max-width: 1080px) {
  .main-nav a {
    padding-inline: 6px;
    font-size: 12px;
  }

  .main-nav a svg {
    display: none;
  }

  .header-inner {
    gap: 15px;
  }
}

@media (max-width: 900px) {
  :root {
    --gutter: 22px;
  }

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

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

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

  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  :root {
    --section-space: 70px;
  }

  h1,
  .display-title {
    font-size: clamp(28px, 9.5vw, 40px);
    line-height: 1.12;
    letter-spacing: -.018em;
  }

  h2 {
    font-size: clamp(27px, 7.6vw, 36px);
  }

  .brand-local {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 34px 24px;
  }

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

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

  body {
    font-size: 14.5px;
  }

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

  .section {
    padding-top: 62px;
    padding-bottom: 62px;
  }

  .header-inner {
    gap: 10px;
  }

  .brand-copy {
    gap: 0;
  }

  .brand-mark {
    width: 30px;
    height: 30px;
  }

  .brand-name {
    font-size: 16px;
  }

  .btn-login {
    min-width: 60px;
    padding-inline: 12px;
  }

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

  .card-pad {
    padding: 20px;
  }

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

  .tilt,
  .tilt-card {
    transform: none;
  }
}

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

  .header-tools {
    gap: 6px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }

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