:root {
  --color-page: #FFFFFF;
  --color-panel: #F7F7F5;
  --color-panel-strong: #EFEFED;
  --color-line: #E6E6E4;
  --color-line-strong: #D8D8D5;
  --color-brand: #2383E2;
  --color-brand-dark: #1A6BBF;
  --color-brand-soft: #E8F1FB;
  --color-ink: #191918;
  --color-ink-muted: #6F6E69;
  --color-success: #2F9E44;
  --color-warning: #D9820B;
  --color-danger: #E03E3E;
  --color-yellow: #F2B824;
  --color-peach: #FFDDBF;
  --color-purple: #8B5CF6;
  --color-black: #191918;
  --color-white: #FFFFFF;
  --color-code: #242422;
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Courier New', monospace;
  --radius-window: 20px;
  --radius-panel: 18px;
  --radius-card: 16px;
  --radius-control: 10px;
  --radius-small: 8px;
  --radius-pill: 999px;
  --gutter: clamp(16px, 4vw, 40px);
  --content-width: 1160px;
  --reading-width: 820px;
  --header-height: 64px;
  --shadow-window: 0 44px 88px -30px rgb(25 25 24 / 26%), 0 18px 36px -18px rgb(25 25 24 / 14%), 0 3px 8px rgb(25 25 24 / 6%);
  --shadow-card: 0 18px 42px -28px rgb(25 25 24 / 24%), 0 3px 10px rgb(25 25 24 / 6%);
  --shadow-float: 0 14px 30px -12px rgb(25 25 24 / 20%), 0 3px 8px rgb(25 25 24 / 8%);
  --shadow-small: 0 1px 3px rgb(25 25 24 / 7%), 0 6px 16px -8px rgb(25 25 24 / 12%);
  --duration-fast: 150ms;
  --duration-normal: 420ms;
  --ease-standard: cubic-bezier(.2, .7, .2, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  min-width: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

html.nav-open {
  overflow: hidden;
}

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

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

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

img {
  height: auto;
}

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

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

button {
  border: 0;
}

a {
  color: var(--color-brand-dark);
  text-decoration-thickness: .08em;
  text-underline-offset: .18em;
}

a:hover {
  color: var(--color-brand);
}

p,
ul,
ol,
dl,
blockquote,
pre,
table,
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;
}

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

:not(pre) > code {
  max-width: 100%;
  overflow-wrap: anywhere;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  background: var(--color-panel);
  color: var(--color-code);
  padding: .1em .38em;
  font-size: .9em;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-code);
  color: var(--color-white);
  padding: 20px;
  font: 13px/1.75 var(--font-mono);
  -webkit-overflow-scrolling: touch;
}

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

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

th,
td {
  border-bottom: 1px solid var(--color-line);
  padding: 13px 15px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--color-panel);
  color: var(--color-ink);
  font-weight: 750;
}

hr {
  height: 1px;
  margin: 40px 0;
  border: 0;
  background: var(--color-line);
}

::selection {
  background: var(--color-brand-soft);
  color: var(--color-ink);
}

:focus-visible {
  outline: 3px solid var(--color-brand);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: calc(var(--content-width) + var(--gutter) * 2);
  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);
}

.header-wrap {
  width: 100%;
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-top: clamp(64px, 8vw, 112px);
  padding-bottom: clamp(64px, 8vw, 112px);
}

.section-compact {
  padding-top: clamp(42px, 6vw, 72px);
  padding-bottom: clamp(42px, 6vw, 72px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  margin-bottom: 12px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-ink-muted);
  padding: 5px 14px;
  font-size: 13px;
  font-weight: 650;
}

.eyebrow-dot,
.status-dot,
.icon-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--color-success);
}

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

h1 {
  margin-bottom: 18px;
  font-size: clamp(34px, 4vw, 48px);
  font-weight: 850;
  line-height: 1.12;
  letter-spacing: -.02em;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 830;
  line-height: 1.18;
  letter-spacing: -.018em;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(21px, 2vw, 28px);
  font-weight: 780;
  line-height: 1.25;
  letter-spacing: -.012em;
}

h4 {
  margin-bottom: 8px;
  font-size: 18px;
  font-weight: 750;
  line-height: 1.35;
}

.title-keep {
  white-space: nowrap;
}

.lead {
  max-width: 700px;
  color: var(--color-ink-muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.7;
}

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

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

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

.highlight-pill {
  display: inline-block;
  border-radius: var(--radius-pill);
  background: var(--color-peach);
  color: var(--color-ink);
  padding-inline: .38em;
  white-space: nowrap;
}

.highlight-pill::before {
  display: inline-block;
  width: .28em;
  height: .28em;
  margin-right: .2em;
  border-radius: 50%;
  background: var(--color-warning);
  content: "";
  vertical-align: .08em;
}

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

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  padding: 10px 24px;
  color: var(--color-ink);
  font-weight: 700;
  line-height: 1.3;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--duration-fast) ease, background-color var(--duration-fast) ease, border-color var(--duration-fast) ease, color var(--duration-fast) ease;
}

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

.button svg {
  width: 17px;
  height: 17px;
  flex: 0 0 auto;
}

.button-primary {
  background: var(--color-brand);
  color: var(--color-white);
}

.button-primary:hover {
  background: var(--color-brand-dark);
  color: var(--color-white);
}

.button-secondary {
  border-color: var(--color-brand-soft);
  background: var(--color-brand-soft);
  color: var(--color-brand-dark);
}

.button-secondary:hover {
  border-color: var(--color-brand);
  background: var(--color-page);
  color: var(--color-brand-dark);
}

.button-outline {
  border-color: var(--color-line-strong);
  background: var(--color-page);
  color: var(--color-ink);
}

.button-outline:hover {
  border-color: var(--color-ink);
  background: var(--color-panel);
}

.button[aria-disabled="true"],
.button:disabled {
  border-color: var(--color-line);
  background: var(--color-panel-strong);
  color: var(--color-ink-muted);
  cursor: not-allowed;
  opacity: .72;
  transform: none;
}

.panel,
.card {
  border: 1px solid var(--color-line);
  background: var(--color-page);
  color: var(--color-ink);
}

.panel {
  border-radius: var(--radius-panel);
  padding: clamp(22px, 4vw, 38px);
}

.card {
  border-radius: var(--radius-card);
  padding: 22px;
  box-shadow: var(--shadow-card);
}

.panel-soft {
  border-color: var(--color-panel);
  background: var(--color-panel);
  color: var(--color-ink);
}

.panel-strong {
  border-color: var(--color-panel-strong);
  background: var(--color-panel-strong);
  color: var(--color-ink);
}

.grid {
  display: grid;
  gap: 22px;
}

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

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

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

.feature-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 22px;
}

.feature-panel {
  position: relative;
  grid-column: span 6;
  min-height: 430px;
  overflow: clip;
  border-radius: var(--radius-window);
  background: var(--color-panel);
  color: var(--color-ink);
  padding: clamp(24px, 4vw, 42px);
  transition: transform var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
}

.feature-panel:nth-child(4n + 1),
.feature-panel:nth-child(4n + 4) {
  grid-column: span 7;
}

.feature-panel:nth-child(4n + 2),
.feature-panel:nth-child(4n + 3) {
  grid-column: span 5;
}

.feature-panel:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.feature-label {
  color: var(--color-ink-muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
}

.feature-panel h3 {
  max-width: 82%;
  margin-top: 12px;
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 850;
  line-height: 1.14;
}

.feature-arrow {
  position: absolute;
  top: 28px;
  right: 28px;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 50%;
  background: var(--color-black);
  color: var(--color-white);
}

.feature-arrow svg {
  width: 19px;
  height: 19px;
}

.feature-inset {
  margin-top: 28px;
  overflow: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-page);
  color: var(--color-ink);
  padding: 18px;
  box-shadow: var(--shadow-small);
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  -webkit-overflow-scrolling: touch;
}

.table-wrap table {
  min-width: 620px;
  margin: 0;
}

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

.prose > * {
  max-width: 100%;
}

.prose h2 {
  margin-top: 2.2em;
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.prose h3 {
  margin-top: 1.8em;
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.prose p,
.prose li {
  overflow-wrap: break-word;
}

.prose a {
  font-weight: 600;
}

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

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

.site-header {
  position: relative;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-page);
  color: var(--color-ink);
}

.site-header-bar {
  display: flex;
  height: var(--header-height);
  align-items: center;
}

.site-brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  color: var(--color-ink);
  text-decoration: none;
}

.site-brand:hover {
  color: var(--color-ink);
}

.site-brand img {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
}

.site-brand-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 820;
  letter-spacing: -.01em;
  white-space: nowrap;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2vw, 30px);
  margin-left: auto;
}

.desktop-nav a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--color-ink-muted);
  font-size: 14px;
  font-weight: 560;
  text-decoration: none;
  white-space: nowrap;
}

.desktop-nav a:hover,
.desktop-nav a.is-active,
.desktop-nav a[aria-current="page"] {
  color: var(--color-ink);
}

.desktop-nav a.is-active,
.desktop-nav a[aria-current="page"] {
  font-weight: 760;
}

.header-tools {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 8px;
  margin-left: 18px;
}

.language-control {
  position: relative;
}

.language-button,
.menu-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line);
  background: var(--color-page);
  color: var(--color-ink-muted);
  cursor: pointer;
}

.language-button {
  gap: 6px;
  border-radius: var(--radius-pill);
  padding: 7px 13px;
  font-size: 13px;
  white-space: nowrap;
}

.language-button:hover,
.menu-button:hover {
  border-color: var(--color-line-strong);
  color: var(--color-ink);
}

.language-short {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 112;
  display: none;
  width: 168px;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-page);
  color: var(--color-ink);
  box-shadow: var(--shadow-float);
  padding: 6px;
}

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

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  border-radius: var(--radius-small);
  color: var(--color-ink-muted);
  padding: 9px 11px;
  text-decoration: none;
}

.language-menu a:hover,
.language-menu a.is-current {
  background: var(--color-panel);
  color: var(--color-ink);
}

.menu-button {
  display: none;
  width: 44px;
  min-width: 44px;
  border-radius: var(--radius-control);
  padding: 0;
}

.menu-button-lines,
.menu-button-lines::before,
.menu-button-lines::after {
  display: block;
  width: 19px;
  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;
}

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

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

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

.mobile-nav {
  position: fixed;
  inset: var(--header-height) 0 auto;
  z-index: 110;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  border-top: 1px solid var(--color-line);
  background: var(--color-page);
  color: var(--color-ink);
  padding: 12px var(--gutter) 20px;
}

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

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  border-bottom: 1px solid var(--color-line);
  color: var(--color-ink);
  padding: 11px 4px;
  font-weight: 650;
  text-decoration: none;
}

.mobile-nav a.is-active {
  color: var(--color-brand-dark);
}

.mobile-language-list {
  margin-top: 14px;
}

.mobile-language-label {
  margin: 0 0 4px;
  color: var(--color-ink-muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .06em;
}

.mobile-language-list a {
  color: var(--color-ink-muted);
  font-weight: 560;
}

.mobile-language-list a.is-current {
  color: var(--color-ink);
  font-weight: 760;
}

.nav-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 90;
  display: none;
  background: var(--color-ink);
  opacity: .28;
}

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

.site-footer {
  margin-top: clamp(70px, 9vw, 120px);
  background: var(--color-panel);
  color: var(--color-ink);
}

.footer-main {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1.2fr .9fr;
  gap: 42px;
  padding-top: 58px;
  padding-bottom: 46px;
}

.footer-brand {
  max-width: 310px;
}

.footer-brand .site-brand {
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--color-ink-muted);
  font-size: 14px;
}

.footer-column h2 {
  margin-bottom: 12px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .04em;
}

.footer-links {
  display: grid;
  gap: 5px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  color: var(--color-ink-muted);
  font-size: 14px;
  text-decoration: none;
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  border-top: 1px solid var(--color-line);
  padding-top: 20px;
  padding-bottom: 24px;
  color: var(--color-ink-muted);
  font-size: 13px;
}

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

.footer-legal a {
  color: var(--color-ink-muted);
  text-decoration: none;
}

.decorated-section,
.hero-scene,
.preview-hero {
  position: relative;
  overflow-x: clip;
}

.tilt-left {
  transform: rotate(-2deg);
}

.tilt-right {
  transform: rotate(2deg);
}

@media (max-width: 1080px) {
  .desktop-nav {
    gap: 16px;
  }

  .desktop-nav a {
    font-size: 13px;
  }

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

@media (max-width: 880px) {
  .desktop-nav {
    display: none;
  }

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

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

  .feature-panel,
  .feature-panel:nth-child(4n + 1),
  .feature-panel:nth-child(4n + 2),
  .feature-panel:nth-child(4n + 3),
  .feature-panel:nth-child(4n + 4) {
    grid-column: span 12;
  }

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

  body {
    font-size: 15px;
  }

  h1 {
    font-size: clamp(24px, 8vw, 30px);
    line-height: 1.16;
    letter-spacing: -.015em;
  }

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

  .site-header,
  .site-header-bar {
    height: var(--header-height);
  }

  .site-brand-name {
    font-size: 16px;
  }

  .site-brand img {
    width: 28px;
    height: 28px;
  }

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

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

  .language-button {
    min-width: 52px;
    padding-inline: 10px;
  }

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

  .button-row .button {
    flex: 1 1 100%;
    width: 100%;
  }

  .grid-2,
  .grid-3,
  .footer-main {
    grid-template-columns: 1fr;
  }

  .feature-panel {
    min-height: 390px;
  }

  .feature-panel h3 {
    max-width: calc(100% - 50px);
  }

  .feature-arrow {
    top: 22px;
    right: 20px;
  }

  .footer-main {
    gap: 30px;
  }

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

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

  th,
  td {
    padding: 11px 12px;
  }

  pre {
    padding: 16px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }

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