:root {
  --color-night: #041440;
  --color-panel: #0A2158;
  --color-panel-raised: #123070;
  --color-border: #27447F;
  --color-accent: #168FE0;
  --color-accent-dark: #084FB8;
  --color-cyan: #7FE7FF;
  --color-lime: #C6FF4A;
  --color-text: #F2F6FF;
  --color-text-muted: #9FB4DE;
  --color-success: #35D08E;
  --color-warning: #FFC24B;
  --color-error: #FF5D73;
  --color-surface: #00286E;
  --color-surface-pure: #0A347A;
  --color-ink: #F2F6FF;
  --color-ink-muted: #B8C9EA;
  --color-code-key: #7FB9FF;
  --color-code-string: #DDE9FF;
  --color-code-punctuation: #6E88BE;
  --color-transparent: transparent;
  --color-night-a98: rgba(4, 20, 64, 0.98);
  --color-night-a92: rgba(4, 20, 64, 0.92);
  --color-night-a72: rgba(4, 20, 64, 0.72);
  --color-panel-a96: rgba(10, 33, 88, 0.96);
  --color-panel-a74: rgba(10, 33, 88, 0.74);
  --color-panel-a50: rgba(10, 33, 88, 0.50);
  --color-panel-a40: rgba(10, 33, 88, 0.40);
  --color-panel-raised-a35: rgba(18, 48, 112, 0.35);
  --color-border-a60: rgba(39, 68, 127, 0.60);
  --color-border-a55: rgba(39, 68, 127, 0.55);
  --color-accent-a52: rgba(34, 167, 255, 0.52);
  --color-accent-a34: rgba(34, 167, 255, 0.34);
  --color-accent-a28: rgba(34, 167, 255, 0.28);
  --color-accent-a20: rgba(34, 167, 255, 0.20);
  --color-accent-a10: rgba(34, 167, 255, 0.10);
  --color-accent-dark-a42: rgba(11, 99, 229, 0.42);
  --color-accent-dark-a34: rgba(11, 99, 229, 0.34);
  --color-lime-a38: rgba(198, 255, 74, 0.38);
  --color-lime-a22: rgba(198, 255, 74, 0.22);
  --color-text-a25: rgba(242, 246, 255, 0.25);
  --color-muted-a09: rgba(159, 180, 222, 0.09);
  --color-success-a80: rgba(53, 208, 142, 0.80);
  --color-shadow-a60: rgba(2, 10, 40, 0.60);
  --color-shadow-a50: rgba(2, 10, 40, 0.50);
  --color-shadow-a18: rgba(2, 10, 40, 0.18);
  --color-ink-a28: rgba(4, 20, 64, 0.28);
  --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: 14px;
  --radius-pill: 999px;
  --shadow-soft: 0 14px 40px var(--color-shadow-a18);
  --shadow-deep: 0 30px 80px var(--color-shadow-a60);
  --shadow-glow: 0 0 46px var(--color-accent-a28);
  --page-width: 1240px;
  --reading-width: 820px;
  --gutter: 32px;
  --header-height: 72px;
  --section-space: 96px;
  --ease-standard: 180ms ease;
}

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

html {
  scroll-behavior: smooth;
  background: var(--color-night);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  color: var(--color-ink);
  background: var(--color-surface);
  font-family: var(--font-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

svg {
  flex-shrink: 0;
}

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

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

button {
  color: inherit;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

ul[role='list'],
ol[role='list'],
.site-nav ul,
.mobile-nav ul,
.site-footer ul {
  list-style: none;
}

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

h1,
h2,
h3,
h4 {
  color: var(--color-ink);
  font-family: var(--font-display);
  line-height: 1.18;
  text-wrap: balance;
}

h1,
.hero-title {
  margin-bottom: 20px;
  font-size: clamp(34px, 3.3vw, 48px);
  font-weight: 900;
  letter-spacing: 0.005em;
  line-height: 1.18;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 850;
}

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

p {
  margin-bottom: 1.1em;
}

strong {
  font-weight: 700;
}

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

:not(pre) > code {
  overflow-wrap: anywhere;
  color: var(--color-code-key);
  background: var(--color-surface-pure);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  padding: 0.1em 0.35em;
}

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

pre code {
  display: block;
  min-width: max-content;
  color: inherit;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 14px 16px;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--color-ink);
  background: var(--color-panel-raised);
  font-weight: 800;
}

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

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

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

.section-dark {
  color: var(--color-text);
  background: var(--color-night);
}

.section-dark h1,
.section-dark h2,
.section-dark h3 {
  color: var(--color-text);
}

.section-kicker {
  margin-bottom: 12px;
  color: var(--color-code-key);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.section-dark .section-kicker {
  color: var(--color-cyan);
}

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

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

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

.panel,
.card {
  min-width: 0;
  padding: 26px;
  background: var(--color-surface-pure);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.panel-dark,
.card-dark {
  color: var(--color-text);
  background: var(--color-panel);
}

.panel-dark h2,
.panel-dark h3,
.card-dark h2,
.card-dark h3 {
  color: var(--color-text);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.card-grid > * {
  min-width: 0;
}

.button,
.btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid var(--color-transparent);
  border-radius: 10px;
  padding: 12px 25px;
  cursor: pointer;
  font-weight: 750;
  line-height: 1.2;
  transition: transform var(--ease-standard), box-shadow var(--ease-standard), border-color var(--ease-standard), background-color var(--ease-standard);
}

.button svg,
.btn svg {
  width: 16px;
  height: 16px;
}

.button-primary,
.btn-main {
  color: var(--color-text);
  background: linear-gradient(180deg, var(--color-accent), var(--color-accent-dark));
  box-shadow: 0 12px 30px var(--color-accent-dark-a42), inset 0 1px 0 var(--color-text-a25);
}

.button-secondary,
.btn-sub {
  color: var(--color-text);
  background: var(--color-panel-a50);
  border-color: var(--color-border);
}

.button-light {
  color: var(--color-text);
  background: var(--color-surface-pure);
  border-color: var(--color-border);
}

.button:hover,
.btn:hover {
  transform: translateY(-2px);
}

.button-primary:hover,
.btn-main:hover {
  box-shadow: 0 16px 36px var(--color-accent-a52), inset 0 1px 0 var(--color-text-a25);
}

.button-secondary:hover,
.btn-sub:hover,
.button-light:hover {
  border-color: var(--color-accent);
}

.button:focus-visible,
.btn:focus-visible,
.site-nav a:focus-visible,
.mobile-nav a:focus-visible,
.lang-button:focus-visible,
.menu-toggle:focus-visible {
  outline: 3px solid var(--color-cyan);
  outline-offset: 3px;
}

.button[disabled],
.button.is-disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 560ms ease, transform 560ms ease;
}

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

.tilt {
  transform: rotate(-0.45deg);
}

#site-header {
  position: relative;
  z-index: 1100;
}

.site-header-shell {
  position: relative;
  z-index: 1000;
  color: var(--color-text);
  background: var(--color-night-a92);
  border-bottom: 1px solid var(--color-border-a55);
}

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

.site-brand {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 11px;
}

.site-brand img {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  filter: drop-shadow(0 4px 12px var(--color-accent-dark-a42));
}

.site-brand-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 850;
  white-space: nowrap;
}

.site-brand-name b {
  color: var(--color-accent);
}

.desktop-nav {
  margin-left: auto;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  position: relative;
  display: block;
  padding: 25px 12px 23px;
  color: var(--color-text-muted);
  font-size: 14px;
  transition: color var(--ease-standard);
}

.site-nav a::after {
  content: '';
  position: absolute;
  right: 12px;
  bottom: -1px;
  left: 12px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-dark), var(--color-accent));
  border-radius: var(--radius-pill);
  transform: scaleX(0);
  transition: transform var(--ease-standard);
}

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

.site-nav a:hover::after {
  transform: scaleX(0.62);
}

.site-nav a[aria-current='page'] {
  font-weight: 700;
}

.site-nav a[aria-current='page']::after {
  transform: scaleX(1);
}

.header-tools {
  display: flex;
  flex: none;
  align-items: center;
  gap: 8px;
}

.lang-wrap {
  position: relative;
}

.lang-button,
.menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  background: var(--color-panel-a40);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.lang-button {
  min-height: 38px;
  gap: 7px;
  padding: 7px 12px;
  font-size: 13px;
  white-space: nowrap;
}

.lang-button svg {
  width: 14px;
  height: 14px;
}

.lang-short {
  display: none;
}

.lang-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 70;
  width: 170px;
  padding: 6px;
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-deep);
}

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

.lang-menu a {
  display: block;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
}

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

.menu-toggle {
  display: none;
  width: 44px;
  min-width: 44px;
  height: 44px;
  min-height: 44px;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  width: 19px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-pill);
}

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

.menu-toggle-lines::before,
.menu-toggle-lines::after {
  content: '';
  position: absolute;
  left: 0;
}

.menu-toggle-lines::before {
  top: -6px;
}

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

.mobile-nav {
  display: none;
}

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  padding: 12px var(--gutter);
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav a:hover,
.mobile-nav a[aria-current='page'] {
  color: var(--color-text);
  background: var(--color-panel-raised);
}

.mobile-language-label {
  padding: 16px var(--gutter) 8px;
  color: var(--color-cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
}

.mobile-nav.is-open {
  display: block;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--color-panel);
}

.site-footer {
  position: relative;
  overflow-x: clip;
  padding-top: 70px;
  color: var(--color-text-muted);
  background: var(--color-night);
  border-top: 1px solid var(--color-border);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.9fr 1.4fr 0.9fr;
  gap: 42px;
}

.footer-brand-copy {
  max-width: 31em;
  margin-top: 18px;
}

.footer-heading {
  margin-bottom: 16px;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 800;
}

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

.footer-links a {
  display: inline-block;
  padding-block: 3px;
}

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

.footer-hot {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-hot a {
  max-width: 100%;
  overflow-wrap: anywhere;
  padding: 5px 9px;
  color: var(--color-text-muted);
  background: var(--color-panel-a50);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 12px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 54px;
  padding-top: 22px;
  padding-bottom: 28px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
}

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

.prose {
  min-width: 0;
}

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

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

.prose a:not(.button) {
  color: var(--color-code-key);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

.prose > .data-table {
  display: block;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

@media (max-width: 1080px) {
  .desktop-nav {
    display: none;
  }

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

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

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

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

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

  h1,
  .hero-title {
    font-size: clamp(24px, 7vw, 30px);
    line-height: 1.2;
  }

  h2 {
    font-size: clamp(25px, 7vw, 32px);
  }

  .lang-full {
    display: none;
  }

  .lang-short {
    display: inline;
  }

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --header-height: 66px;
    --section-space: 60px;
  }

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

  .site-header-row {
    gap: 10px;
  }

  .site-brand-name {
    font-size: 15px;
  }

  .site-brand img {
    width: 31px;
    height: 31px;
  }

  .lang-button {
    min-width: 56px;
  }

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

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

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

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

  .footer-grid {
    gap: 34px;
  }
}

@media (max-width: 380px) {
  .site-brand-name {
    display: none;
  }
}

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

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

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