:root {
  --color-bg: #FFFFFF;
  --color-panel: #F8F9F8;
  --color-panel-strong: #F1F3F1;
  --color-border: #E4E7E3;
  --color-accent: #0E6B3F;
  --color-accent-dark: #0A4A2C;
  --color-text: #141F19;
  --color-muted: #5D6963;
  --color-success: #1F8A4C;
  --color-warning: #B8860B;
  --color-error: #C2453A;
  --color-gold: #C9A24B;
  --color-gold-soft: #F8F1E1;
  --color-accent-soft: #E9F1EC;
  --color-flag-red: #CE3B3B;
  --color-flag-blue: #2E4A9E;
  --color-flag-green: #1F7A45;
  --color-white: #FFFFFF;
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Courier New', monospace;
  --radius-small: 6px;
  --radius-medium: 10px;
  --radius-large: 16px;
  --radius-pill: 999px;
  --shadow-cta: 0 12px 26px rgb(14 107 63 / 18%);
  --shadow-card: 0 18px 46px rgb(20 31 25 / 7%);
  --shadow-float: 0 14px 32px rgb(14 107 63 / 24%);
  --line: 1px solid var(--color-border);
  --layout-max: 1320px;
  --content-max: 820px;
  --gutter: 40px;
  --header-height: 64px;
  --section-space: clamp(72px, 9vw, 128px);
  --toc-offset: 82px;
  --transition-fast: 150ms ease;
  --transition-medium: 480ms cubic-bezier(.2, .7, .2, 1);
}

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

html {
  scroll-behavior: smooth;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  -webkit-text-size-adjust: 100%;
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

img {
  height: auto;
}

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

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

button {
  border: 0;
}

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

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

ul,
ol {
  padding: 0;
}

li {
  min-width: 0;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

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

code {
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border: var(--line);
  border-radius: var(--radius-medium);
  background: var(--color-panel-strong);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-overflow-scrolling: touch;
}

pre code {
  overflow-wrap: normal;
}

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

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

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

.content-wrap {
  width: 100%;
  max-width: calc(var(--content-max) + 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: clamp(48px, 6vw, 80px);
  padding-bottom: clamp(48px, 6vw, 80px);
  overflow-x: clip;
}

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

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

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

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

.grad-text {
  background: linear-gradient(100deg, var(--color-accent-dark), var(--color-accent) 45%, var(--color-gold));
  color: transparent;
  -webkit-background-clip: text;
  background-clip: text;
}

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

h1,
.hero-title {
  font-size: clamp(52px, 5vw, 72px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.12;
}

h2 {
  font-size: clamp(34px, 4vw, 52px);
  font-weight: 800;
  letter-spacing: -.018em;
  line-height: 1.16;
}

h3 {
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 750;
  line-height: 1.28;
}

h4 {
  font-size: 18px;
  font-weight: 750;
  line-height: 1.4;
}

.lead {
  max-width: 46em;
  color: var(--color-muted);
  font-size: clamp(17px, 1.7vw, 21px);
  line-height: 1.8;
}

.eyebrow,
.badge,
.tag {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  border: var(--line);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.2;
}

.eyebrow {
  min-height: 30px;
  padding: 6px 14px;
}

.badge,
.tag {
  padding: 6px 11px;
  overflow: hidden;
  white-space: nowrap;
}

.eyebrow-dot,
.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--color-gold);
}

.btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 25px;
  border: 1px solid transparent;
  border-radius: var(--radius-medium);
  cursor: pointer;
  font-weight: 700;
  line-height: 1.2;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

.btn:hover {
  transform: translateY(-1px);
}

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

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

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

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

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

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

.btn-disabled,
.btn:disabled {
  cursor: not-allowed;
  opacity: .48;
  transform: none;
  box-shadow: none;
}

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

.card {
  padding: 28px;
  box-shadow: var(--shadow-card);
}

.panel {
  padding: clamp(24px, 4vw, 48px);
}

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

.nav-inner {
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  gap: 30px;
}

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

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

.brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
}

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

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 27px;
  margin-left: 8px;
}

.desktop-nav a {
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 550;
  transition: color var(--transition-fast);
}

.desktop-nav a:hover {
  color: var(--color-text);
}

.desktop-nav a.is-active {
  color: var(--color-accent);
  font-weight: 750;
}

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

.login-link {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  padding: 0 19px;
  border-radius: var(--radius-small);
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 700;
}

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

.language-picker {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 6px;
  padding: 0 8px;
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  font-size: 13px;
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 154px;
  padding: 7px;
  border: var(--line);
  border-radius: var(--radius-medium);
  background: var(--color-bg);
  box-shadow: var(--shadow-card);
}

.language-menu[hidden] {
  display: none;
}

.language-menu a {
  display: flex;
  min-height: 40px;
  align-items: center;
  padding: 0 10px;
  border-radius: var(--radius-small);
  color: var(--color-muted);
  font-size: 13px;
}

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

.menu-toggle {
  display: none;
  width: 44px;
  min-width: 44px;
  height: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  background: transparent;
  cursor: pointer;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  display: block;
  width: 21px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-text);
  content: "";
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

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

.menu-toggle-lines::before {
  position: absolute;
  top: -7px;
}

.menu-toggle-lines::after {
  position: absolute;
  top: 7px;
}

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

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::before {
  top: 0;
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::after {
  top: 0;
  transform: rotate(-45deg);
}

.mobile-nav {
  display: none;
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  padding: 10px 18px;
  border-bottom: var(--line);
  color: var(--color-muted);
}

.mobile-nav a.is-active,
.mobile-nav a[aria-current="true"] {
  color: var(--color-accent);
  font-weight: 750;
}

.mobile-language-label {
  padding: 16px 18px 5px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
}

.nav-veil {
  display: none;
}

.site-footer {
  margin-top: var(--section-space);
  border-top: var(--line);
  background: var(--color-panel);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr 1.2fr .9fr;
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 48px;
}

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

.footer-heading {
  margin-bottom: 16px;
  font-size: 14px;
  font-weight: 800;
}

.footer-links {
  display: grid;
  gap: 10px;
  list-style: none;
}

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

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 22px;
  padding-bottom: 26px;
  border-top: var(--line);
  color: var(--color-muted);
  font-size: 13px;
}

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

.prose {
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.9;
}

.prose > * + * {
  margin-top: 1.25em;
}

.prose h2 {
  margin-top: 2.2em;
}

.prose h3 {
  margin-top: 1.8em;
}

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

.prose ul,
.prose ol {
  padding-left: 1.5em;
}

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

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

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

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

@media (max-width: 1100px) {
  .desktop-nav {
    gap: 17px;
  }

  .desktop-nav a {
    font-size: 13px;
  }

  .brand-local {
    display: none;
  }
}

@media (max-width: 900px) {
  .desktop-nav,
  .language-picker {
    display: none;
  }

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

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

  .site-header.is-open {
    position: relative;
    z-index: 300;
  }

  .mobile-nav {
    position: absolute;
    z-index: 302;
    top: 100%;
    right: 0;
    left: 0;
    display: block;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    border-top: var(--line);
    background: var(--color-bg);
    -webkit-overflow-scrolling: touch;
  }

  .nav-veil {
    position: fixed;
    z-index: 290;
    inset: var(--header-height) 0 0;
    display: block;
    background: rgb(20 31 25 / 18%);
  }

  .nav-veil[hidden] {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --gutter: 22px;
  }

  h1,
  .hero-title {
    font-size: clamp(34px, 9.6vw, 40px);
    line-height: 1.14;
  }

  h2 {
    font-size: clamp(28px, 7.8vw, 38px);
  }

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

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

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

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

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

  .nav-inner {
    gap: 8px;
  }

  .brand-name {
    font-size: 17px;
  }

  .brand-local {
    display: none;
  }

  .login-link {
    min-height: 38px;
    padding-inline: 13px;
  }

  .btn {
    min-height: 48px;
    padding-inline: 20px;
  }

  .card,
  .panel {
    padding: 20px;
  }

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

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

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