:root {
  color-scheme: dark;
  --color-page: #000000;
  --color-panel: #0B0C0E;
  --color-panel-raised: #121316;
  --color-line: #26282C;
  --color-accent: #00A3FF;
  --color-accent-deep: #0077C2;
  --color-text: #F2F4F6;
  --color-text-muted: #9BA1A8;
  --color-success: #2FD672;
  --color-warning: #F5B83D;
  --color-error: #F05A5A;
  --color-button-ink: #00131F;
  --color-transparent: transparent;
  --color-overlay: rgba(0, 0, 0, 0.76);
  --color-accent-06: rgba(0, 163, 255, 0.06);
  --color-accent-10: rgba(0, 163, 255, 0.10);
  --color-accent-18: rgba(0, 163, 255, 0.18);
  --color-accent-35: rgba(0, 163, 255, 0.35);
  --color-accent-55: rgba(0, 163, 255, 0.55);
  --color-accent-75: rgba(0, 163, 255, 0.75);
  --font-display: 'Inter', 'Noto Sans SC', -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  --radius-small: 8px;
  --radius-medium: 14px;
  --radius-large: 24px;
  --radius-pill: 999px;
  --gutter: clamp(16px, 4vw, 40px);
  --content-width: 1120px;
  --wide-width: 1240px;
  --header-height: 70px;
  --section-space: clamp(72px, 10vw, 136px);
  --transition-fast: 180ms ease;
  --transition-reveal: 680ms cubic-bezier(0.2, 0.75, 0.25, 1);
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  background: var(--color-page);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--color-page);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

svg {
  flex-shrink: 0;
}

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

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

button {
  border: 0;
}

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

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

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

nav ul,
.site-footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

h1 {
  margin-bottom: 24px;
  font-size: clamp(34px, 4.4vw, 48px);
  font-weight: 500;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(28px, 3.2vw, 40px);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 600;
  line-height: 1.35;
}

h4 {
  margin-bottom: 10px;
  font-size: 17px;
  font-weight: 600;
}

p {
  margin-bottom: 1.2em;
}

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

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

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

:not(pre) > code {
  overflow-wrap: anywhere;
  color: var(--color-text);
  font-size: 0.9em;
}

pre {
  display: block;
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.75;
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

pre code {
  color: inherit;
}

hr {
  height: 1px;
  margin: 48px 0;
  border: 0;
  background: var(--color-line);
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-small);
}

.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(--wide-width) + var(--gutter) * 2);
}

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

.section-heading {
  max-width: 760px;
  margin-bottom: clamp(32px, 5vw, 56px);
}

.section-heading p {
  max-width: 680px;
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: clamp(16px, 1.8vw, 19px);
}

.eyebrow,
.mono-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow {
  margin-bottom: 14px;
  color: var(--color-accent);
}

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

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

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

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

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

.panel {
  padding: clamp(24px, 4vw, 44px);
}

.card {
  padding: clamp(22px, 3vw, 32px);
}

.grid {
  display: grid;
  gap: 20px;
}

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

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

.grid-three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.stack > * + * {
  margin-top: 20px;
}

.button,
.btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 26px;
  border: 1px solid var(--color-transparent);
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

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

.button-primary,
.btn-primary,
.prose a.button-primary {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-button-ink);
  text-decoration: none;
  box-shadow: 0 0 24px var(--color-accent-35);
}

.button-primary:hover,
.btn-primary:hover {
  border-color: var(--color-accent-deep);
  background: var(--color-accent-deep);
  color: var(--color-text);
  transform: translateY(-1px);
}

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

.button-secondary:hover,
.btn-ghost:hover {
  border-color: var(--color-text-muted);
  background: var(--color-panel-raised);
  color: var(--color-text);
}

.button[aria-disabled="true"],
.button:disabled {
  cursor: not-allowed;
  opacity: 0.58;
  transform: none;
}

.site-head {
  position: relative;
  z-index: 80;
  min-height: var(--header-height);
  background: var(--color-page);
  color: var(--color-text);
}

.head-inner {
  display: flex;
  width: 100%;
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  height: var(--header-height);
  margin-inline: auto;
  padding-inline: var(--gutter);
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
}

.brand-mark {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.head-nav {
  display: flex;
  margin-left: auto;
  align-items: center;
  gap: 4px;
}

.head-nav a {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 7px;
  padding: 8px 11px;
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
  font-size: 13px;
  white-space: nowrap;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.head-nav a svg {
  width: 15px;
  height: 15px;
}

.head-nav a:hover {
  background: var(--color-panel-raised);
  color: var(--color-text);
}

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

.head-nav a[aria-current="page"] svg {
  color: var(--color-accent);
}

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

.lang-box {
  position: relative;
}

.lang-switch {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-transparent);
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 13px;
  white-space: nowrap;
}

.lang-switch:hover,
.lang-switch[aria-expanded="true"] {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.lang-caret {
  font-size: 10px;
}

.lang-short {
  display: none;
}

.lang-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 94;
  width: 178px;
  padding: 8px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-panel-raised);
  color: var(--color-text);
}

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

.lang-menu a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 9px 12px;
  border-radius: var(--radius-small);
  color: var(--color-text-muted);
  font-size: 14px;
}

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

.nav-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  padding: 10px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-transparent);
  color: var(--color-text);
  cursor: pointer;
}

.nav-toggle-lines,
.nav-toggle-lines::before,
.nav-toggle-lines::after {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle-lines {
  position: relative;
  margin-inline: auto;
}

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

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

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

.nav-toggle[aria-expanded="true"] .nav-toggle-lines {
  background: var(--color-transparent);
}

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

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

.mobile-nav {
  display: none;
}

.mobile-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 70;
  background: var(--color-overlay);
}

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

.site-footer {
  margin-top: var(--section-space);
  border-top: 1px solid var(--color-line);
  background: var(--color-page);
  color: var(--color-text);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1.25fr 0.85fr;
  gap: clamp(28px, 5vw, 64px);
  padding-top: 64px;
  padding-bottom: 48px;
}

.footer-brand p {
  max-width: 310px;
  margin-top: 18px;
  color: var(--color-text-muted);
  font-size: 14px;
}

.footer-title {
  margin-bottom: 16px;
  color: var(--color-text);
  font-size: 13px;
  font-weight: 600;
}

.footer-links {
  display: grid;
  gap: 9px;
}

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

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

.footer-bottom {
  display: flex;
  padding-top: 20px;
  padding-bottom: 28px;
  border-top: 1px solid var(--color-line);
  justify-content: space-between;
  gap: 20px;
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--transition-reveal), transform var(--transition-reveal);
}

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

.tilt {
  transform: rotate(-0.35deg);
}

.table-scroll {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-panel);
  color: var(--color-text);
}

.data-table th,
.data-table td {
  padding: 15px 18px;
  border: 1px solid var(--color-line);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  background: var(--color-panel-raised);
  color: var(--color-text);
  font-size: 14px;
  font-weight: 600;
}

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

.prose {
  max-width: 820px;
  color: var(--color-text-muted);
}

.prose > * {
  min-width: 0;
}

.prose h2,
.prose h3,
.prose h4 {
  margin-top: 2.25em;
}

.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-55);
  text-underline-offset: 3px;
}

.prose li + li {
  margin-top: 8px;
}

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

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

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

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

@media (max-width: 960px) {
  .head-nav {
    display: none;
  }

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

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

  .mobile-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    left: 0;
    z-index: 91;
    display: none;
    max-height: calc(100dvh - var(--header-height));
    padding: 14px var(--gutter) 24px;
    overflow-y: auto;
    overscroll-behavior: contain;
    border-top: 1px solid var(--color-line);
    background: var(--color-panel);
    color: var(--color-text);
  }

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

  .mobile-nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .mobile-nav a {
    display: flex;
    width: 100%;
    min-height: 48px;
    align-items: center;
    gap: 11px;
    padding: 11px 12px;
    border-bottom: 1px solid var(--color-line);
    color: var(--color-text);
  }

  .mobile-nav a svg {
    width: 18px;
    height: 18px;
    color: var(--color-text-muted);
  }

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

  .mobile-language-title {
    margin: 22px 12px 8px;
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.08em;
  }

  .mobile-language-links a {
    color: var(--color-text-muted);
  }

  .mobile-language-links a[aria-current="true"] {
    color: var(--color-text);
  }

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

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

@media (max-width: 768px) {
  h1 {
    font-size: clamp(24px, 7.4vw, 30px);
    line-height: 1.24;
  }

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

  .section {
    padding-top: 72px;
    padding-bottom: 72px;
  }

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

  .button,
  .btn {
    padding-inline: 22px;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --header-height: 64px;
  }

  .head-inner {
    height: var(--header-height);
    gap: 10px;
  }

  .brand-name {
    font-size: 14px;
  }

  .brand-mark {
    width: 28px;
    height: 28px;
  }

  .lang-full {
    display: none;
  }

  .lang-short {
    display: inline;
  }

  .lang-switch {
    min-width: 44px;
    min-height: 44px;
    justify-content: center;
    padding-inline: 10px;
  }

  .lang-menu {
    display: none;
  }

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

  .cluster {
    flex-direction: row;
    flex-wrap: wrap;
  }

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

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    padding-top: 48px;
  }

  .data-table {
    min-width: 620px;
  }
}

@media (max-width: 420px) {
  .brand-name {
    max-width: 112px;
    white-space: normal;
    line-height: 1.25;
  }

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

@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;
  }

  .button-primary:hover,
  .btn-primary:hover {
    transform: none;
  }
}