:root {
  --color-bg: #14180A;
  --color-panel: #1C2110;
  --color-panel-raised: #252C17;
  --color-border: #3A4224;
  --color-globe-line: #4A5530;
  --color-annotation: #6E7857;
  --color-accent: #59DDF5;
  --color-accent-strong: #1FA8C9;
  --color-text: #F2F4E8;
  --color-text-muted: #A9B292;
  --color-success: #8FD96A;
  --color-warning: #E8C24A;
  --color-error: #F26D5B;
  --color-flag-red: #C93A32;
  --color-flag-blue: #31508F;
  --color-flag-dark: #101208;
  --color-shadow: #080A04;
  --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', 'SFMono-Regular', 'Menlo', Consolas, 'Courier New', monospace;
  --radius-none: 0;
  --radius-small: 4px;
  --radius-logo: 8px;
  --header-height: 68px;
  --content-width: 1248px;
  --content-wide: 1360px;
  --gutter: clamp(16px, 4vw, 56px);
  --section-space: clamp(72px, 9vw, 128px);
  --focus-ring: 2px solid var(--color-accent);
  --shadow-panel: 0 24px 70px color-mix(in srgb, var(--color-shadow) 48%, transparent);
  --shadow-accent: 0 0 32px color-mix(in srgb, var(--color-accent) 24%, transparent);
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  background: var(--color-bg);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  min-height: 100svh;
  margin: 0;
  overflow-x: clip;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

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

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

img {
  height: auto;
}

svg,
.icon {
  flex-shrink: 0;
}

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

button,
summary {
  cursor: pointer;
}

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

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

ul,
ol {
  padding: 0;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  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: -0.012em;
  line-height: 1.1;
}

h2 {
  font-size: clamp(34px, 4vw, 52px);
  font-weight: 800;
  letter-spacing: -0.012em;
  line-height: 1.15;
}

h3 {
  font-size: clamp(21px, 2.3vw, 29px);
  font-weight: 750;
  line-height: 1.3;
}

h4 {
  font-size: 17px;
  font-weight: 700;
}

p + p {
  margin-top: 1em;
}

strong {
  color: var(--color-text);
  font-weight: 650;
}

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

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

code {
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--color-border);
  background: var(--color-panel);
  color: var(--color-text);
  -webkit-overflow-scrolling: touch;
}

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

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

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

.wrap {
  max-width: calc(var(--content-width) + var(--gutter) * 2);
}

.wrap-wide {
  max-width: calc(var(--content-wide) + var(--gutter) * 2);
}

.section {
  position: relative;
  overflow-x: clip;
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}

.section-tight {
  position: relative;
  overflow-x: clip;
  padding-top: clamp(48px, 6vw, 80px);
  padding-bottom: clamp(48px, 6vw, 80px);
}

.section-head {
  display: grid;
  max-width: 760px;
  gap: 14px;
  margin-bottom: 40px;
}

.eyebrow,
.mono-label {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.lead {
  max-width: 760px;
  color: var(--color-text-muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.75;
}

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

.accent-text {
  color: var(--color-accent);
  text-shadow: 0 0 34px color-mix(in srgb, var(--color-accent) 30%, transparent);
}

.panel,
.card {
  min-width: 0;
  border: 1px solid var(--color-border);
  background: var(--color-panel);
}

.panel-raised,
.card-raised {
  background: var(--color-panel-raised);
  box-shadow: var(--shadow-panel);
}

.badge,
.tag,
.fact-chip {
  display: inline-flex;
  min-width: 24px;
  min-height: 24px;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  padding: 3px 9px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

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

.status-dot {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 10px color-mix(in srgb, var(--color-accent) 72%, transparent);
}

.status-dot.is-warn {
  background: var(--color-warning);
  box-shadow: none;
}

.btn,
.btn-primary,
.btn-secondary,
.btn-quiet {
  display: inline-flex;
  min-width: 24px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 26px;
  border: 1px solid transparent;
  border-radius: var(--radius-none);
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.2;
  text-align: center;
  transition: color 180ms ease, background-color 180ms ease, border-color 180ms ease, transform 180ms ease, box-shadow 180ms ease;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 40px color-mix(in srgb, var(--color-accent) 36%, transparent);
}

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

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

.btn-quiet {
  border-color: transparent;
  color: var(--color-text-muted);
}

.btn-quiet:hover {
  color: var(--color-text);
}

.btn[aria-disabled="true"],
.btn:disabled {
  cursor: not-allowed;
  opacity: 0.46;
  transform: none;
}

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;
}

.site-head {
  position: relative;
  z-index: 50;
  display: flex;
  min-height: var(--header-height);
  align-items: stretch;
  gap: 32px;
  padding-inline: clamp(16px, 3.2vw, 44px);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.brand {
  display: inline-flex;
  min-width: 24px;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

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

.brand-name {
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-local {
  color: var(--color-text-muted);
  font-weight: 550;
}

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

.main-nav a {
  position: relative;
  display: flex;
  min-height: 44px;
  align-items: center;
  padding-inline: 12px;
  color: var(--color-text-muted);
  font-size: 13px;
  white-space: nowrap;
  transition: color 180ms ease;
}

.main-nav a::after {
  position: absolute;
  right: 12px;
  bottom: -1px;
  left: 12px;
  height: 2px;
  background: var(--color-accent);
  content: "";
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 220ms ease;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--color-text);
}

.main-nav a:hover::after,
.main-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.head-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.language-menu {
  position: relative;
}

.lang-toggle {
  min-width: 44px;
  min-height: 44px;
  padding: 6px 8px;
  border: 0;
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.lang-toggle:hover {
  color: var(--color-text);
}

.language-popover {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 60;
  display: none;
  width: 168px;
  border: 1px solid var(--color-border);
  background: var(--color-panel-raised);
  box-shadow: var(--shadow-panel);
}

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

.language-popover a {
  display: flex;
  min-height: 44px;
  align-items: center;
  padding: 10px 14px;
  color: var(--color-text-muted);
}

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

.login-btn {
  display: inline-flex;
  min-width: 64px;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  font-weight: 650;
  letter-spacing: 0.04em;
  transition: color 180ms ease, background-color 180ms ease;
}

.login-btn:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

.nav-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);
  background: transparent;
  color: var(--color-text);
}

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

.mobile-nav {
  display: none;
}

.mobile-nav a {
  width: 100%;
}

.site-footer {
  position: relative;
  overflow-x: clip;
  border-top: 1px solid var(--color-border);
  background: var(--color-panel);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr 1fr 0.8fr;
  gap: clamp(32px, 5vw, 72px);
  padding-top: 64px;
  padding-bottom: 52px;
}

.footer-brand {
  display: grid;
  align-content: start;
  gap: 18px;
}

.footer-brand p {
  max-width: 360px;
  color: var(--color-text-muted);
}

.footer-title {
  margin-bottom: 14px;
  color: var(--color-annotation);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.footer-links {
  display: grid;
  gap: 7px;
  list-style: none;
}

.footer-links a {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  color: var(--color-text-muted);
}

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

.footer-bottom {
  display: flex;
  min-height: 66px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}

.reveal {
  transition: opacity 520ms ease, transform 520ms ease;
}

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

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

.prose {
  min-width: 0;
  color: var(--color-text-muted);
}

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

.prose h2,
.prose h3 {
  margin-top: 2.2em;
  color: var(--color-text);
}

.prose a:not(.btn):not(.btn-primary):not(.btn-secondary) {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

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

@media (max-width: 1180px) {
  .site-head {
    gap: 18px;
  }

  .main-nav a {
    padding-inline: 8px;
    font-size: 12px;
  }

  .main-nav a::after {
    right: 8px;
    left: 8px;
  }
}

@media (max-width: 960px) {
  .site-head {
    align-items: center;
  }

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

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

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

  .mobile-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    z-index: 55;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-panel-raised);
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
  }

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

  .mobile-nav a,
  .mobile-nav .mobile-language-title {
    display: flex;
    width: 100%;
    min-height: 48px;
    align-items: center;
    padding: 11px var(--gutter);
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-muted);
  }

  .mobile-nav a:hover,
  .mobile-nav a[aria-current="page"],
  .mobile-nav a[aria-current="true"] {
    color: var(--color-accent);
  }

  .mobile-language-title {
    color: var(--color-annotation);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.12em;
  }

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

@media (max-width: 768px) {
  h1,
  .hero-title {
    font-size: clamp(28px, 9.8vw, 40px);
    line-height: 1.12;
  }

  h2 {
    font-size: clamp(28px, 8vw, 38px);
  }

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

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding-block: 18px;
  }
}

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

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

  .wrap,
  .wrap-wide,
  .section-head,
  .lead {
    min-width: 0;
    overflow-wrap: anywhere;
  }

  .site-head {
    gap: 10px;
    padding-inline: 16px;
  }

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

  .brand-local {
    display: none;
  }

  .login-btn {
    min-width: 58px;
    padding-inline: 12px;
  }

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

  .btn,
  .btn-primary,
  .btn-secondary {
    max-width: 100%;
  }
}

@media (max-width: 374px) {
  .brand-logo {
    width: 28px;
    height: 28px;
  }

  .head-tools {
    gap: 6px;
  }

  .login-btn {
    min-width: 52px;
    padding-inline: 9px;
    font-size: 13px;
  }
}

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

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

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