:root {
  --color-canvas: #FAF5EA;
  --color-surface: #FFFDF6;
  --color-surface-soft: #F1E7D3;
  --color-border: #E3D6BC;
  --color-accent: #9C6A08;
  --color-accent-deep: #744E04;
  --color-ink: #2C2417;
  --color-ink-muted: #6F6353;
  --color-success: #3E7A3C;
  --color-warning: #C2571B;
  --color-error: #B3362B;
  --color-route-muted: #CDBB97;
  --color-flag-red: #CE352C;
  --color-flag-blue: #2A3F76;
  --color-flag-white: #FFFFFF;
  --color-shadow: rgba(44, 36, 23, 0.08);
  --color-button-shadow: rgba(156, 106, 8, 0.22);
  --color-focus-halo: rgba(156, 106, 8, 0.18);
  --color-paper-noise: rgba(111, 99, 83, 0.045);
  --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, "Courier New", monospace;
  --radius-xs: 5px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --shadow-card: 0 16px 38px var(--color-shadow);
  --shadow-button: 0 6px 16px var(--color-button-shadow);
  --header-height: 66px;
  --content-width: 1240px;
  --reading-width: 780px;
  --gutter: 28px;
  --section-space: 96px;
  --focus-ring: 2px solid var(--color-accent);
  --transition-fast: 150ms ease;
  --transition-reveal: 620ms cubic-bezier(0.22, 0.7, 0.3, 1);
  --z-header: 30;
  --z-overlay: 28;
  --z-drawer: 32;
  --z-noise: 60;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
}

html.nav-open {
  overflow: hidden;
}

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

body::before {
  position: fixed;
  inset: 0;
  z-index: var(--z-noise);
  pointer-events: none;
  content: "";
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.78' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px 160px;
  mix-blend-mode: multiply;
}

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

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

svg {
  flex-shrink: 0;
}

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

button,
summary {
  color: inherit;
}

button,
[role="tab"],
summary {
  cursor: pointer;
}

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

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

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

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  text-wrap: balance;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(52px, 5vw, 72px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(34px, 4vw, 48px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.018em;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(22px, 2.3vw, 28px);
  font-weight: 750;
  line-height: 1.3;
}

h4 {
  margin-bottom: 8px;
  font-size: 18px;
  font-weight: 750;
}

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

:not(pre) > code {
  padding: 2px 5px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  overflow-wrap: anywhere;
  background: var(--color-surface-soft);
  font-size: 0.9em;
}

pre {
  max-width: 100%;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-ink);
  color: var(--color-surface);
  line-height: 1.65;
  -webkit-overflow-scrolling: touch;
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="tab"]:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 3px;
  box-shadow: 0 0 0 5px var(--color-focus-halo);
}

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

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

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

.section-soft {
  border-block: 1px solid var(--color-border);
  background: var(--color-surface);
}

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

.eyebrow {
  margin-bottom: 16px;
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.lead {
  max-width: 720px;
  color: var(--color-ink-muted);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.75;
}

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

.text-link {
  display: inline-flex;
  min-height: 24px;
  align-items: center;
  gap: 6px;
  color: var(--color-accent-deep);
  font-weight: 700;
}

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

.button {
  display: inline-flex;
  min-width: 24px;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-weight: 700;
  line-height: 1.35;
  text-align: center;
  transition:
    color var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

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

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

.button-primary:hover {
  border-color: var(--color-accent-deep);
  background: var(--color-accent-deep);
}

.button-secondary {
  border-color: var(--color-border);
  background: var(--color-surface);
  color: var(--color-ink);
}

.button-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-deep);
}

.button-dark {
  border-color: var(--color-ink);
  background: var(--color-ink);
  color: var(--color-surface);
}

.button-dark:hover {
  border-color: var(--color-accent-deep);
  background: var(--color-accent-deep);
}

.button-small {
  min-height: 40px;
  padding: 9px 18px;
  font-size: 14px;
}

.button[aria-disabled="true"],
.button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

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

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

.card {
  padding: 26px;
  box-shadow: 0 8px 24px var(--color-shadow);
}

.badge,
.fact-chip,
.status-chip {
  display: inline-flex;
  max-width: 100%;
  min-height: 28px;
  align-items: center;
  gap: 7px;
  padding: 4px 11px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink-muted);
  font-size: 13px;
  line-height: 1.4;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

.status-dot {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-success);
}

.fact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

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

.nav-shell {
  position: relative;
}

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

.brand {
  display: inline-flex;
  min-height: 44px;
  flex: none;
  align-items: center;
  gap: 10px;
}

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

.brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.brand-local {
  color: var(--color-ink-muted);
  font-size: 13px;
  font-weight: 550;
}

.nav-links {
  display: flex;
  flex: 1;
  align-items: center;
  gap: 6px;
  color: var(--color-ink-muted);
  font-size: 13px;
  white-space: nowrap;
}

.nav-links a {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  padding-inline: 1px;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--color-accent-deep);
}

.nav-links a.is-active {
  font-weight: 750;
}

.nav-separator {
  color: var(--color-route-muted);
  user-select: none;
}

.header-tools {
  position: relative;
  display: flex;
  flex: none;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.language-control {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding-inline: 8px;
  border: 0;
  background: transparent;
  color: var(--color-ink-muted);
  font-size: 13px;
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: var(--z-drawer);
  display: none;
  width: 156px;
  padding: 7px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

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

.language-menu a {
  display: flex;
  min-height: 42px;
  align-items: center;
  padding-inline: 12px;
  border-radius: var(--radius-xs);
  font-size: 13px;
}

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

.login-link {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  padding: 8px 19px;
  border-radius: var(--radius-sm);
  background: var(--color-ink);
  color: var(--color-surface);
  font-size: 13px;
  font-weight: 700;
}

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

.menu-button {
  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-surface);
}

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

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

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

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

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

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

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 46px;
  align-items: center;
  padding-inline: 12px;
  border-bottom: 1px solid var(--color-border);
}

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

.mobile-language-list {
  padding-top: 10px;
}

.mobile-language-label {
  margin: 6px 12px;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.mobile-language-list a[aria-current="true"] {
  background: var(--color-surface-soft);
  color: var(--color-accent-deep);
}

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

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

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-soft);
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(240px, 1.2fr) repeat(3, minmax(150px, 1fr));
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 44px;
}

.footer-brand {
  max-width: 320px;
}

.footer-brand .brand {
  margin-bottom: 15px;
}

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

.footer-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

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

.footer-links a {
  display: inline-flex;
  width: fit-content;
  min-height: 28px;
  align-items: center;
  color: var(--color-ink-muted);
  font-size: 14px;
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  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-ink-muted);
  font-size: 13px;
}

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

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

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

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

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

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

.prose h2 {
  margin-top: 2.3em;
}

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

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

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

@media (max-width: 1120px) {
  .nav-links {
    display: none;
  }

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

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

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
    --section-space: 72px;
  }

  h1 {
    font-size: clamp(34px, 10vw, 40px);
    line-height: 1.12;
  }

  h2 {
    font-size: clamp(29px, 8vw, 36px);
  }

  .brand-local,
  .language-control {
    display: none;
  }

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

  .login-link {
    min-height: 40px;
    padding-inline: 14px;
  }

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --section-space: 58px;
  }

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

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

  .button-row .button {
    flex: 1 1 140px;
  }

  .card {
    padding: 20px;
  }

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

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

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

@media (max-width: 380px) {
  .brand-name {
    font-size: 17px;
  }

  .login-link {
    padding-inline: 11px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto;
    animation-duration: 0.01ms;
    animation-iteration-count: 1;
    transition-duration: 0.01ms;
  }

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