:root {
  --color-page: #FFFFFF;
  --color-panel: #F6F7F9;
  --color-panel-strong: #EEF0F4;
  --color-line: #E4E7EC;
  --color-brand: #2D5BFF;
  --color-brand-deep: #1E41D9;
  --color-brand-soft: rgba(45, 91, 255, 0.09);
  --color-ink: #16181D;
  --color-ink-muted: #5B616E;
  --color-positive: #12A150;
  --color-caution: #E8930C;
  --color-negative: #DE3B3B;
  --color-white: #FFFFFF;
  --color-glow-pink: #FFD9E8;
  --color-glow-lilac: #D9D4F7;
  --color-glow-blue: #CFE0FF;
  --color-glow-clear-pink: rgba(255, 217, 232, 0);
  --color-glow-clear-lilac: rgba(217, 212, 247, 0);
  --color-glow-clear-blue: rgba(207, 224, 255, 0);
  --color-stage-start: #FEFBFD;
  --color-stage-middle: #FAFAFE;
  --color-stage-end: #F8FAFF;
  --color-shadow-soft: rgba(22, 24, 29, 0.08);
  --color-shadow-lift: rgba(22, 24, 29, 0.07);
  --color-shadow-switch: rgba(22, 24, 29, 0.18);
  --color-shadow-fab: rgba(45, 91, 255, 0.32);
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;
  --shadow-soft: 0 24px 64px var(--color-shadow-soft);
  --shadow-lift: 0 12px 36px var(--color-shadow-lift);
  --page-width: 1200px;
  --header-width: 1280px;
  --reading-width: 820px;
  --gutter: 40px;
  --header-height: 76px;
  --section-space: 112px;
  --transition-fast: 150ms ease;
  --transition-reveal: 620ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

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

html {
  color-scheme: light;
  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: 1.7;
  -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: transparent;
}

button {
  border: 0;
  cursor: pointer;
}

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

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

ul,
ol {
  padding: 0;
}

ul[role="list"],
ol[role="list"],
.site-nav-list,
.footer-links,
.platform-row {
  list-style: none;
}

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

code {
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  margin: 24px 0;
  padding: 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-ink);
  font-size: 14px;
  line-height: 1.75;
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}

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

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

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

th {
  background: var(--color-panel);
  color: var(--color-ink);
  font-weight: 600;
}

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

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

.wrap {
  width: 100%;
  max-width: calc(var(--page-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(var(--header-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-heading {
  max-width: 760px;
  margin-bottom: 42px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--color-brand-deep);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.eyebrow::before {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-brand);
  content: "";
}

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

h1,
.hero-title {
  font-size: clamp(34px, 3.35vw, 48px);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h2 {
  font-size: clamp(30px, 3vw, 42px);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(21px, 2vw, 28px);
  font-weight: 600;
  line-height: 1.35;
}

h4 {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
}

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

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

.lead {
  color: var(--color-ink-muted);
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.75;
}

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

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

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

.prose h2 {
  margin-top: 72px;
}

.prose h3 {
  margin-top: 42px;
}

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

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

.prose a {
  color: var(--color-brand-deep);
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

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

.button,
.btn {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  padding: 12px 28px;
  color: var(--color-ink);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.35;
  text-align: center;
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

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

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

.button-primary:hover,
.btn-primary:hover {
  border-color: var(--color-brand-deep);
  background: var(--color-brand-deep);
  color: var(--color-white);
}

.button-secondary,
.btn-ghost {
  border-color: var(--color-brand);
  background: var(--color-page);
  color: var(--color-brand-deep);
}

.button-secondary:hover,
.btn-ghost:hover {
  border-color: var(--color-brand);
  background: var(--color-brand-soft);
  color: var(--color-brand-deep);
}

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

.button[disabled],
.button.is-disabled {
  border-color: var(--color-line);
  background: var(--color-panel-strong);
  color: var(--color-ink-muted);
  cursor: not-allowed;
  opacity: 0.72;
  transform: none;
}

.button svg,
.btn svg {
  width: 18px;
  height: 18px;
}

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

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

.panel {
  padding: clamp(24px, 4vw, 48px);
}

.card {
  padding: 26px;
}

.card-white {
  background: var(--color-page);
  color: var(--color-ink);
}

.card h3 + p,
.panel h3 + p {
  margin-top: 12px;
  color: var(--color-ink-muted);
}

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

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

.site-top-row {
  display: flex;
  height: var(--header-height);
  align-items: center;
  gap: 28px;
}

.site-brand {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.site-brand img {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.desktop-nav {
  min-width: 0;
  margin-left: auto;
}

.site-nav-list {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.site-nav-list li {
  display: flex;
  align-items: center;
}

.site-nav-list li + li::before {
  margin-inline: 14px;
  color: var(--color-line);
  content: "·";
  font-weight: 700;
}

.site-nav-list a {
  padding: 7px 2px;
  border-radius: var(--radius-sm);
  color: var(--color-ink-muted);
  font-size: 15px;
  transition: color var(--transition-fast);
}

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

.site-nav-list a[aria-current="page"] {
  font-weight: 600;
}

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

.language-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  padding: 7px 15px;
  background: var(--color-page);
  color: var(--color-ink-muted);
  font-size: 14px;
  white-space: nowrap;
}

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

.language-short {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 104;
  display: none;
  width: 176px;
  padding: 8px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-page);
  color: var(--color-ink);
  box-shadow: var(--shadow-lift);
}

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

.language-menu a {
  display: flex;
  min-height: 42px;
  width: 100%;
  align-items: center;
  border-radius: var(--radius-sm);
  padding: 8px 11px;
  color: var(--color-ink-muted);
  font-size: 14px;
}

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

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

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

.mobile-drawer {
  display: none;
}

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

.mobile-drawer-inner {
  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);
}

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

.mobile-drawer a {
  display: flex;
  min-height: 48px;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-line);
  padding: 12px var(--gutter);
  color: var(--color-ink);
}

.mobile-drawer a[aria-current="page"],
.mobile-drawer a[aria-current="true"] {
  color: var(--color-brand-deep);
  font-weight: 600;
}

.mobile-drawer-label {
  padding: 22px var(--gutter) 8px;
  color: var(--color-ink-muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.mobile-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 90;
  display: none;
  border: 0;
  background: var(--color-shadow-soft);
}

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

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

.footer-main {
  display: grid;
  grid-template-columns: minmax(260px, 1.25fr) repeat(3, minmax(150px, 1fr));
  gap: 46px;
  padding-top: 64px;
  padding-bottom: 48px;
}

.footer-brand {
  max-width: 330px;
}

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

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

.footer-column h2 {
  margin-bottom: 14px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

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

.footer-links a {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  color: var(--color-ink-muted);
  font-size: 14px;
}

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

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

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

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

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity var(--transition-reveal),
    transform var(--transition-reveal);
}

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

.decor-zone {
  position: relative;
  overflow-x: clip;
}

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

@media (max-width: 1080px) {
  :root {
    --section-space: 88px;
  }

  .desktop-nav {
    display: none;
  }

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

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

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

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

@media (max-width: 768px) {
  :root {
    --gutter: 22px;
    --section-space: 72px;
  }

  h1,
  .hero-title {
    font-size: clamp(24px, 7.5vw, 30px);
    line-height: 1.28;
  }

  h2 {
    font-size: clamp(26px, 7vw, 34px);
  }

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

  .language-menu {
    display: none;
  }

  .footer-main {
    gap: 34px 24px;
  }

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --header-height: 68px;
  }

  body {
    font-size: 15px;
  }

  .site-top-row {
    height: var(--header-height);
    gap: 10px;
  }

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

  .site-brand img {
    width: 32px;
    height: 32px;
  }

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

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

  .card,
  .panel {
    padding: 22px;
  }

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

  .footer-main {
    padding-top: 48px;
  }

  .footer-brand {
    max-width: none;
  }

  th,
  td {
    min-width: 140px;
    padding: 12px;
  }
}

@media (max-width: 370px) {
  .site-brand-name {
    display: none;
  }

  .language-button {
    padding-inline: 12px;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    scroll-behavior: auto !important;
    transition: none !important;
  }

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