:root {
  --color-page: #F4F4F4;
  --color-panel: #FFFFFF;
  --color-soft: #EBEBEB;
  --color-line: #DEDEDE;
  --color-ink: #111111;
  --color-muted: #6B6B6B;
  --color-action: #171717;
  --color-action-hover: #000000;
  --color-success: #2F7A47;
  --color-warning: #A86A10;
  --color-error: #B3261E;
  --color-shadow-soft: rgba(0, 0, 0, .04);
  --color-shadow-card: rgba(0, 0, 0, .06);
  --color-shadow-menu: rgba(0, 0, 0, .08);
  --color-shadow-knob: rgba(0, 0, 0, .18);
  --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", Menlo, Consolas, monospace;
  --radius-small: 6px;
  --radius-card: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 1px 2px var(--color-shadow-soft), 0 8px 24px var(--color-shadow-card);
  --shadow-menu: 0 6px 20px var(--color-shadow-menu);
  --shadow-knob: 0 1px 2px var(--color-shadow-knob);
  --header-height: 72px;
  --content-width: 1200px;
  --wide-width: 1280px;
  --reading-width: 820px;
  --gutter: 40px;
  --section-space: 96px;
  --transition-fast: 150ms ease;
  --transition-reveal: 520ms ease;
}

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

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: 1.68;
  -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%;
}

img {
  height: auto;
}

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

button {
  cursor: pointer;
}

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

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

ul,
ol {
  padding-left: 1.25rem;
}

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

h1 {
  margin: 0 0 20px;
  font-size: clamp(34px, 3.4vw, 48px);
  font-weight: 800;
  letter-spacing: -.018em;
  line-height: 1.1;
}

h2 {
  margin: 0 0 20px;
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 760;
  letter-spacing: -.015em;
  line-height: 1.15;
}

h3 {
  margin: 0 0 12px;
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 700;
  line-height: 1.25;
}

h4 {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.35;
}

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

small {
  font-size: 13px;
}

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

:not(pre) > code {
  padding: .12em .36em;
  overflow-wrap: anywhere;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  background: var(--color-soft);
  color: var(--color-ink);
  font-size: .88em;
}

pre {
  max-width: 100%;
  margin: 24px 0;
  padding: 18px 20px;
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-action);
  color: var(--color-panel);
  font: 13px/1.75 var(--font-mono);
  -webkit-overflow-scrolling: touch;
}

pre code {
  color: inherit;
  white-space: pre;
}

table {
  border-collapse: collapse;
}

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

th {
  background: var(--color-soft);
  color: var(--color-ink);
  font-weight: 650;
}

td {
  background: var(--color-panel);
  color: var(--color-ink);
}

:focus-visible {
  outline: 2px solid var(--color-action);
  outline-offset: 3px;
  border-radius: var(--radius-small);
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  padding: 10px 14px;
  transform: translateY(-160%);
  border-radius: var(--radius-small);
  background: var(--color-action);
  color: var(--color-panel);
}

.skip-link:focus {
  transform: translateY(0);
}

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

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

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

.bench {
  width: min(100%, var(--wide-width));
  min-height: 100svh;
  margin-inline: auto;
  overflow-x: clip;
  border-right: 1px solid var(--color-line);
  border-left: 1px solid var(--color-line);
}

.section {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
  border-top: 1px solid var(--color-line);
}

.section-heading {
  max-width: 720px;
  margin-bottom: 42px;
}

.section-heading p,
.lead,
.muted {
  color: var(--color-muted);
}

.lead {
  font-size: 18px;
  line-height: 1.75;
}

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

.card {
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.panel {
  padding: 28px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: 1px solid var(--color-action);
  border-radius: var(--radius-card);
  background: var(--color-action);
  color: var(--color-panel);
  font-weight: 650;
  line-height: 1.2;
  text-align: center;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

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

.button--secondary {
  border-color: var(--color-line);
  background: var(--color-panel);
  color: var(--color-ink);
}

.button--secondary:hover {
  border-color: var(--color-line);
  background: var(--color-soft);
  color: var(--color-ink);
}

.button--quiet {
  border-color: transparent;
  background: transparent;
  color: var(--color-ink);
}

.button--quiet:hover {
  border-color: var(--color-line);
  background: var(--color-soft);
  color: var(--color-ink);
}

.button[aria-disabled="true"],
.button:disabled {
  cursor: not-allowed;
  border-color: var(--color-line);
  background: var(--color-soft);
  color: var(--color-muted);
}

.icon,
.dot,
.brand-logo,
.client-logo {
  flex-shrink: 0;
}

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

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--transition-reveal), transform var(--transition-reveal);
}

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

.site-header {
  position: relative;
  z-index: 100;
  height: var(--header-height);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-page);
  color: var(--color-ink);
}

.site-header__row {
  display: flex;
  height: var(--header-height);
  align-items: center;
  gap: 26px;
}

.site-brand {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 720;
  letter-spacing: -.01em;
  white-space: nowrap;
}

.site-brand img,
.footer-brand img {
  width: 30px;
  height: 30px;
}

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

.nav-link,
.nav-more__button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 12px;
  border: 0;
  border-radius: var(--radius-small);
  background: transparent;
  color: var(--color-ink);
  font-size: 15px;
}

.nav-link:hover,
.nav-more__button:hover,
.nav-link.is-active,
.nav-more.is-active > .nav-more__button {
  background: var(--color-soft);
  color: var(--color-ink);
}

.nav-link.is-active {
  font-weight: 650;
}

.nav-chevron {
  width: 12px;
  height: 12px;
}

.nav-more {
  position: relative;
}

.nav-more__menu,
.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  z-index: 110;
  min-width: 190px;
  padding: 6px;
  visibility: hidden;
  opacity: 0;
  transform: translateY(-4px);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-panel);
  color: var(--color-ink);
  box-shadow: var(--shadow-menu);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}

.nav-more__menu {
  left: 0;
}

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

.nav-more__menu a,
.language-menu a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 8px 10px;
  border-radius: var(--radius-small);
  color: var(--color-ink);
}

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

.nav-more__menu small {
  display: block;
  color: var(--color-muted);
  line-height: 1.35;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 8px;
}

.language-switch {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 7px 12px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-panel);
  color: var(--color-ink);
}

.language-button:hover {
  background: var(--color-soft);
}

.language-menu {
  right: 0;
}

.language-short {
  display: none;
}

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  padding: 10px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-panel);
  color: var(--color-ink);
}

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

.mobile-drawer {
  display: none;
}

.menu-veil {
  display: none;
}

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

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.5fr 1fr;
  gap: 52px;
  padding-top: 64px;
  padding-bottom: 52px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-weight: 720;
}

.footer-summary {
  max-width: 310px;
  color: var(--color-muted);
}

.footer-column h2 {
  margin-bottom: 14px;
  font-size: 14px;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.footer-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  color: var(--color-muted);
}

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

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

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

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

.prose h2 {
  margin-top: 2.2em;
  scroll-margin-top: 90px;
}

.prose h3 {
  margin-top: 1.8em;
  scroll-margin-top: 90px;
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  min-width: 640px;
}

.decorated-section,
.hero-visual-zone {
  position: relative;
  overflow-x: clip;
}

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

@media (max-width: 1080px) {
  :root {
    --gutter: 28px;
  }

  .desktop-nav {
    gap: 0;
  }

  .nav-link,
  .nav-more__button {
    padding-inline: 9px;
  }

  .footer-grid {
    grid-template-columns: 1.2fr 1fr 1fr;
  }

  .footer-grid .footer-column:last-child {
    grid-column: 2;
  }
}

@media (max-width: 860px) {
  :root {
    --header-height: 64px;
    --section-space: 72px;
  }

  h1 {
    font-size: clamp(24px, 7vw, 30px);
    line-height: 1.14;
  }

  h2 {
    font-size: clamp(25px, 6vw, 32px);
  }

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

  .desktop-nav {
    display: none;
  }

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

  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .mobile-drawer {
    position: fixed;
    top: var(--header-height);
    right: 0;
    left: 0;
    z-index: 102;
    display: none;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 10px var(--gutter) 22px;
    border-top: 1px solid var(--color-line);
    border-bottom: 1px solid var(--color-line);
    background: var(--color-panel);
    color: var(--color-ink);
    box-shadow: var(--shadow-menu);
  }

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

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

  .mobile-drawer a {
    display: flex;
    width: 100%;
    min-height: 48px;
    align-items: center;
    padding: 10px 8px;
    border-bottom: 1px solid var(--color-line);
    color: var(--color-ink);
  }

  .mobile-drawer a.is-active {
    font-weight: 700;
  }

  .mobile-drawer__languages {
    padding-top: 16px;
  }

  .mobile-drawer__languages strong {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
  }

  .mobile-drawer__languages a {
    min-height: 44px;
  }

  .menu-veil {
    position: fixed;
    inset: var(--header-height) 0 0;
    z-index: 101;
    border: 0;
    background: var(--color-shadow-knob);
  }

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

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

  .footer-grid .footer-column:last-child {
    grid-column: auto;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 18px;
    --section-space: 60px;
  }

  body {
    font-size: 15px;
  }

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

  .bench {
    border-right: 0;
    border-left: 0;
  }

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

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

  .language-button {
    min-width: 44px;
    padding-inline: 9px;
  }

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

  .button-row .button {
    flex: 1 1 150px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
    padding-top: 48px;
  }

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

  .tilt {
    transform: none;
  }

  .data-table {
    min-width: 560px;
  }
}

@media (max-width: 380px) {
  :root {
    --gutter: 16px;
  }

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

  .site-brand span {
    max-width: 116px;
    white-space: normal;
    line-height: 1.15;
  }
}

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

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

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