:root {
  --color-bg: #0E1013;
  --color-panel: #14181D;
  --color-panel-raised: #1A2027;
  --color-border: #262E37;
  --color-border-soft: #1E252D;
  --color-accent: #31D9C4;
  --color-accent-dark: #149E8C;
  --color-accent-soft: #93EDDE;
  --color-text: #E9EEF2;
  --color-text-muted: #97A3AD;
  --color-white: #FFFFFF;
  --color-success: #46D68A;
  --color-warning: #E7B84C;
  --color-error: #E8604F;
  --color-shadow: rgba(0, 0, 0, .5);
  --color-glass: rgba(18, 22, 27, .68);
  --color-glass-border: rgba(233, 238, 242, .09);
  --color-glass-inner: rgba(49, 217, 196, .05);
  --color-glow: rgba(49, 217, 196, .11);
  --color-dot: rgba(151, 163, 173, .13);
  --color-button-glow: rgba(49, 217, 196, .26);
  --color-globe-line: rgba(49, 217, 196, .26);
  --color-globe-ring: rgba(49, 217, 196, .46);
  --color-globe-core: rgba(49, 217, 196, .14);
  --color-route: rgba(49, 217, 196, .6);
  --color-flag-red: #D5464C;
  --color-flag-white: #F4F6F8;
  --color-flag-navy: #20386B;
  --color-flag-blue: #31508F;
  --color-flag-green: #3F9B62;
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --radius-xs: 8px;
  --radius-sm: 11px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 999px;
  --header-height: 68px;
  --gutter: 32px;
  --content-width: 1240px;
  --reading-width: 760px;
  --section-space: 104px;
  --focus-width: 2px;
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --shadow-panel: 0 34px 90px var(--color-shadow);
}

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

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

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);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

img {
  height: auto;
}

svg {
  flex-shrink: 0;
}

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

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

button {
  border: 0;
  cursor: pointer;
}

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

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

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

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

h1 {
  margin-bottom: 24px;
  font-size: clamp(52px, 5.15vw, 72px);
  font-weight: 600;
  letter-spacing: .005em;
  line-height: 1.14;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(32px, 3.4vw, 48px);
  font-weight: 600;
  letter-spacing: .005em;
  line-height: 1.2;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(21px, 2vw, 28px);
  font-weight: 600;
  line-height: 1.3;
}

h4 {
  margin-bottom: 10px;
  font-size: 18px;
}

p {
  margin-bottom: 1.15em;
  color: var(--color-text-muted);
}

strong {
  color: var(--color-text);
  font-weight: 600;
}

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

code {
  overflow-wrap: anywhere;
  color: var(--color-accent-soft);
}

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

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

hr {
  margin: 42px 0;
  border: 0;
  border-top: 1px solid var(--color-border-soft);
}

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

:where(a, button, input, select, textarea, summary, [role="tab"]):focus-visible {
  outline: var(--focus-width) solid var(--color-accent);
  outline-offset: 3px;
}

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

.wrap {
  width: 100%;
  max-width: var(--content-width);
  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);
  overflow-x: clip;
}

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

.section-head {
  max-width: 720px;
  margin-bottom: 44px;
}

.kicker,
.eyebrow-label {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.gradient-text {
  background: linear-gradient(115deg, var(--color-accent) 12%, var(--color-accent-soft) 88%);
  color: transparent;
  -webkit-background-clip: text;
  background-clip: text;
}

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

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.button,
.btn {
  display: inline-flex;
  min-width: 24px;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 28px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-weight: 600;
  line-height: 1;
  text-align: center;
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast),
    background var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast);
}

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

.button-primary,
.btn-primary {
  background: var(--color-accent);
  box-shadow: 0 10px 30px var(--color-button-glow);
  color: var(--color-bg);
}

.button-primary:hover,
.btn-primary:hover {
  box-shadow: 0 14px 36px var(--color-button-glow);
}

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

.button-secondary:hover,
.btn-ghost:hover {
  border-color: var(--color-accent-dark);
  background: var(--color-panel);
}

.button-quiet {
  background: var(--color-panel-raised);
  color: var(--color-text);
}

.button-small {
  min-height: 40px;
  padding-inline: 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
}

.button[aria-disabled="true"],
.button:disabled {
  cursor: not-allowed;
  opacity: .48;
  transform: none;
}

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

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

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

.glass-panel {
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  background: var(--color-glass);
  box-shadow: var(--shadow-panel), 0 0 70px var(--color-glow);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.badge,
.chip {
  display: inline-flex;
  max-width: 100%;
  min-height: 28px;
  align-items: center;
  gap: 8px;
  overflow: hidden;
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel-raised);
  color: var(--color-text-muted);
  font-size: 13px;
  line-height: 1.4;
}

.status-dot {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 10px var(--color-button-glow);
}

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

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

.site-head {
  position: relative;
  z-index: 100;
  border-bottom: 1px solid var(--color-border-soft);
  background: var(--color-bg);
}

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

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

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

.brand-name {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .02em;
}

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

.desktop-nav {
  display: flex;
  flex: 1;
  align-items: center;
  gap: 4px;
}

.nav-link,
.nav-more-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  padding: 8px 13px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-muted);
  font-size: 14px;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover,
.nav-more-button:hover,
.nav-link.is-active,
.nav-more-button.is-active {
  background: var(--color-panel-raised);
  color: var(--color-text);
}

.nav-link.is-active {
  font-weight: 600;
}

.nav-more {
  position: relative;
}

.nav-caret {
  margin-left: 5px;
  font-size: 11px;
}

.nav-dropdown,
.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  min-width: 178px;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  visibility: hidden;
  background: var(--color-panel-raised);
  box-shadow: 0 18px 46px var(--color-shadow);
  opacity: 0;
  transform: translateY(-4px);
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast),
    visibility var(--transition-fast);
}

.nav-dropdown {
  left: 0;
}

.nav-more:hover .nav-dropdown,
.nav-more:focus-within .nav-dropdown,
.language-picker.is-open .language-menu {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
}

.nav-dropdown a,
.language-menu a {
  display: flex;
  width: 100%;
  min-height: 40px;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  color: var(--color-text-muted);
  font-size: 14px;
}

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

.header-tools {
  display: flex;
  flex: none;
  align-items: center;
  gap: 10px;
}

.language-picker {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  padding: 7px 8px;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 13px;
}

.language-menu {
  right: 0;
}

.login-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-text);
  font-size: 14px;
  font-weight: 600;
}

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

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

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  display: block;
  width: 18px;
  height: 1px;
  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: -6px;
}

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

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

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::before {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::after {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-nav {
  display: none;
}

.mobile-nav-veil {
  display: none;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: minmax(250px, 1.35fr) repeat(3, minmax(150px, 1fr));
  gap: 48px;
  padding-top: 72px;
  padding-bottom: 52px;
}

.footer-brand {
  max-width: 360px;
}

.footer-brand-line {
  display: flex;
  align-items: center;
  gap: 11px;
  margin-bottom: 18px;
}

.footer-logo {
  width: 38px;
  height: 38px;
}

.footer-title {
  margin-bottom: 16px;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 600;
}

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

.footer-links a {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  color: var(--color-text-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: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.reveal {
  transition: opacity .6s ease, transform .6s ease;
}

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

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

[data-counter] {
  display: inline-block;
  min-width: 3ch;
  font-variant-numeric: tabular-nums;
  text-align: right;
}

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

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

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

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

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

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

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

@media (max-width: 1040px) {
  .desktop-nav {
    display: none;
  }

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

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

  .mobile-nav-veil {
    position: fixed;
    z-index: 89;
    inset: var(--header-height) 0 0;
    background: var(--color-shadow);
  }

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

  .mobile-nav {
    position: absolute;
    z-index: 101;
    top: var(--header-height);
    right: 0;
    left: 0;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    padding: 12px var(--gutter) 20px;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-panel-raised);
    overscroll-behavior: contain;
  }

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

  .mobile-nav a {
    display: flex;
    width: 100%;
    min-height: 48px;
    align-items: center;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
  }

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

  .mobile-nav-group {
    padding-top: 10px;
    margin-top: 10px;
    border-top: 1px solid var(--color-border);
  }

  .mobile-nav-label {
    padding: 4px 12px;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .12em;
  }
}

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
    --section-space: 76px;
  }

  h1 {
    font-size: clamp(32px, 9.6vw, 40px);
    line-height: 1.14;
  }

  h2 {
    font-size: clamp(28px, 8vw, 36px);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px 26px;
  }

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

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

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

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

  .site-head-inner {
    gap: 10px;
  }

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

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

  .button-row,
  .button-row .button,
  .button-row .btn {
    width: 100%;
  }

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

  .footer-brand {
    grid-column: auto;
  }

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

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