:root {
  --color-page: #FFFFFF;
  --color-panel: #F4F6F9;
  --color-panel-strong: #EAEEF4;
  --color-line: #E3E7ED;
  --color-brand: #2E6FF2;
  --color-brand-deep: #1E4FC2;
  --color-ink: #16181D;
  --color-ink-muted: #5C6470;
  --color-positive: #1DB56C;
  --color-caution: #F5A300;
  --color-negative: #E5484D;
  --color-highlight: #FFD23F;
  --color-highlight-ink: #16181D;
  --color-white: #FFFFFF;
  --color-code: #20242C;
  --color-code-muted: #C5CBD4;
  --color-code-key: #82AFFF;
  --color-code-value: #A9DC76;
  --color-code-number: #FFD866;
  --color-backdrop: rgba(22, 24, 29, 0.38);
  --color-shadow-soft: rgba(22, 24, 29, 0.06);
  --color-shadow-medium: rgba(22, 24, 29, 0.10);
  --color-brand-glow: rgba(46, 111, 242, 0.32);
  --color-brand-halo-core: rgba(46, 111, 242, 0.10);
  --color-brand-halo-mid: rgba(46, 111, 242, 0.045);
  --color-brand-halo-clear: rgba(46, 111, 242, 0);
  --color-tile-inner: rgba(255, 255, 255, 0.70);
  --color-tile-sheen: rgba(255, 255, 255, 0.52);
  --color-transparent: rgba(255, 255, 255, 0);
  --color-blue-high: rgba(46, 111, 242, 0.34);
  --color-blue-low: rgba(46, 111, 242, 0.10);
  --color-blue-ring: rgba(46, 111, 242, 0.52);
  --color-blue-glow: rgba(46, 111, 242, 0.42);
  --color-blue-ink: #1E4FC2;
  --color-green-high: rgba(29, 181, 108, 0.34);
  --color-green-low: rgba(29, 181, 108, 0.10);
  --color-green-ring: rgba(29, 181, 108, 0.52);
  --color-green-glow: rgba(29, 181, 108, 0.42);
  --color-green-ink: #0E8A4F;
  --color-orange-high: rgba(245, 163, 0, 0.32);
  --color-orange-low: rgba(245, 163, 0, 0.09);
  --color-orange-ring: rgba(245, 163, 0, 0.50);
  --color-orange-glow: rgba(245, 163, 0, 0.40);
  --color-orange-ink: #805600;
  --color-pink-high: rgba(240, 98, 146, 0.32);
  --color-pink-low: rgba(240, 98, 146, 0.09);
  --color-pink-ring: rgba(240, 98, 146, 0.50);
  --color-pink-glow: rgba(240, 98, 146, 0.40);
  --color-pink-ink: #A52A59;
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --radius-small: 12px;
  --radius-medium: 18px;
  --radius-large: 24px;
  --radius-card: 28px;
  --radius-feature: 32px;
  --radius-pill: 999px;
  --shadow-card: 0 2px 8px var(--color-shadow-soft), 0 24px 64px var(--color-shadow-medium);
  --shadow-float: 0 12px 32px var(--color-shadow-medium);
  --shadow-button: 0 12px 26px -10px var(--color-brand-glow);
  --page-width: 1120px;
  --header-width: 1280px;
  --reading-width: 780px;
  --gutter: clamp(16px, 4vw, 28px);
  --header-height: 64px;
  --section-space: clamp(72px, 10vw, 136px);
  --ease-standard: cubic-bezier(0.22, 1, 0.36, 1);
}

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

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;
  text-rendering: optimizeLegibility;
}

body,
button,
input,
select,
textarea {
  font-family: var(--font-body);
}

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

button {
  color: inherit;
}

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

img {
  height: auto;
}

a {
  color: var(--color-brand-deep);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.2em;
}

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

p,
ul,
ol,
dl,
blockquote,
pre,
table {
  margin-top: 0;
  margin-bottom: 1.2em;
}

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

li::marker {
  color: var(--color-brand);
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  line-height: 1.18;
  text-wrap: balance;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(34px, 4.2vw, 48px);
  font-weight: 900;
  letter-spacing: -0.02em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(29px, 4vw, 42px);
  font-weight: 850;
  letter-spacing: -0.018em;
}

h3 {
  margin-bottom: 14px;
  font-size: clamp(22px, 2.8vw, 28px);
  font-weight: 800;
  letter-spacing: -0.012em;
}

h4 {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 800;
}

strong {
  color: var(--color-ink);
  font-weight: 750;
}

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

:not(pre) > code {
  overflow-wrap: anywhere;
  padding: 0.12em 0.4em;
  border-radius: 7px;
  background: var(--color-panel-strong);
  color: var(--color-ink);
  font-size: 0.9em;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 22px;
  border-radius: var(--radius-medium);
  background: var(--color-code);
  color: var(--color-code-muted);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.75;
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}

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

.code-key {
  color: var(--color-code-key);
}

.code-value {
  color: var(--color-code-value);
}

.code-number {
  color: var(--color-code-number);
}

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  overflow: hidden;
  border-radius: var(--radius-medium);
  background: var(--color-page);
  color: var(--color-ink);
  box-shadow: inset 0 0 0 1px var(--color-line);
}

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

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

tr:last-child td {
  border-bottom: 0;
}

.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);
}

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

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

.section-yellow {
  background: var(--color-highlight);
  color: var(--color-highlight-ink);
}

.section-heading {
  max-width: 760px;
  margin-bottom: clamp(34px, 6vw, 60px);
}

.section-heading.centered {
  margin-inline: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 100%;
  margin-bottom: 14px;
  padding: 6px 13px;
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-brand-deep);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.055em;
}

.eyebrow-dot {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-positive);
}

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

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

.panel,
.card {
  border-radius: var(--radius-card);
  background: var(--color-page);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
}

.panel {
  padding: clamp(24px, 4vw, 46px);
}

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

.soft-card {
  border-radius: var(--radius-large);
  background: var(--color-panel);
  color: var(--color-ink);
  padding: clamp(22px, 3vw, 32px);
}

.feature-banner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1.1fr);
  gap: clamp(34px, 7vw, 80px);
  align-items: center;
  overflow: clip;
  padding: clamp(34px, 6vw, 72px);
  border-radius: var(--radius-feature);
  background: var(--color-page);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
}

.feature-banner.reverse .feature-copy {
  order: 2;
}

.feature-banner.reverse .feature-visual {
  order: 1;
}

.feature-copy p:last-child {
  margin-bottom: 0;
}

.feature-visual {
  min-height: 300px;
  border-radius: var(--radius-large);
  background: var(--color-panel);
  color: var(--color-ink);
}

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

.button {
  display: inline-flex;
  min-height: 48px;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 24px;
  border: 0;
  border-radius: var(--radius-pill);
  font-size: 15.5px;
  font-weight: 750;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: transform 180ms var(--ease-standard), background-color 180ms ease, box-shadow 180ms ease;
}

.button svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

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

.button-primary:hover {
  transform: translateY(-1px);
  background: var(--color-brand-deep);
  color: var(--color-white);
}

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

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

.button-outline {
  box-shadow: inset 0 0 0 1px var(--color-line);
  background: var(--color-page);
  color: var(--color-ink);
}

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

.button:focus-visible,
.site-nav a:focus-visible,
.header-tool:focus-visible,
.mobile-nav a:focus-visible,
.footer-links a:focus-visible {
  outline: 3px solid var(--color-brand-glow);
  outline-offset: 3px;
}

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

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 640ms var(--ease-standard), transform 640ms var(--ease-standard);
}

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

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

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

.site-brand {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 850;
  letter-spacing: 0.01em;
  text-decoration: none;
}

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

.site-brand img {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.site-nav {
  display: flex;
  margin-inline: auto;
  align-items: center;
  gap: 5px;
}

.site-nav > a,
.nav-more-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  padding: 8px 15px;
  border: 0;
  border-radius: var(--radius-pill);
  background: var(--color-page);
  color: var(--color-ink);
  font-size: 15px;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
}

.site-nav > a:hover,
.nav-more-button:hover,
.site-nav > a[aria-current="page"] {
  background: var(--color-panel);
  color: var(--color-brand-deep);
}

.nav-more {
  position: relative;
}

.nav-caret {
  margin-left: 5px;
  color: var(--color-ink-muted);
  font-size: 11px;
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 9px);
  left: 50%;
  width: 174px;
  padding: 8px;
  visibility: hidden;
  opacity: 0;
  transform: translateX(-50%) translateY(-4px);
  border-radius: var(--radius-medium);
  background: var(--color-page);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
  transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease;
}

.nav-more:hover .nav-dropdown,
.nav-more:focus-within .nav-dropdown {
  visibility: visible;
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 9px 13px;
  border-radius: var(--radius-small);
  color: var(--color-ink);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
}

.nav-dropdown a:hover,
.nav-dropdown a[aria-current="page"] {
  background: var(--color-panel);
  color: var(--color-brand-deep);
}

.header-tools {
  position: relative;
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
}

.header-tool {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: var(--radius-pill);
  background: var(--color-page);
  color: var(--color-ink-muted);
  font-size: 14px;
  font-weight: 650;
  cursor: pointer;
}

.language-button {
  padding: 8px 10px;
  white-space: nowrap;
}

.language-short {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 170px;
  padding: 8px;
  visibility: hidden;
  opacity: 0;
  transform: translateY(-4px);
  border-radius: var(--radius-medium);
  background: var(--color-page);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
  transition: opacity 160ms ease, transform 160ms ease, visibility 160ms ease;
}

.language-menu.open {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
}

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 9px 13px;
  border-radius: var(--radius-small);
  color: var(--color-ink);
  text-decoration: none;
}

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

.header-cta {
  min-height: 40px;
  padding: 9px 20px;
  font-size: 14px;
}

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  padding: 10px;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-ink);
}

.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;
}

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

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

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

.mobile-nav {
  position: absolute;
  top: var(--header-height);
  right: var(--gutter);
  left: var(--gutter);
  z-index: 102;
  display: none;
  max-height: calc(100dvh - var(--header-height) - 16px);
  overflow-y: auto;
  padding: 12px;
  border-radius: var(--radius-large);
  background: var(--color-page);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
  overscroll-behavior: contain;
}

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

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  padding: 11px 14px;
  border-radius: var(--radius-small);
  color: var(--color-ink);
  font-weight: 700;
  text-decoration: none;
}

.mobile-nav a:hover,
.mobile-nav a[aria-current="page"],
.mobile-nav a[aria-current="true"] {
  background: var(--color-panel);
  color: var(--color-brand-deep);
}

.mobile-nav-label {
  padding: 16px 14px 5px;
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

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

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

.site-footer {
  padding-top: 72px;
  background: var(--color-panel);
  color: var(--color-ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(260px, 1.4fr) repeat(3, minmax(150px, 0.75fr));
  gap: 44px;
}

.footer-brand-copy {
  max-width: 390px;
  margin-top: 18px;
  color: var(--color-ink-muted);
}

.footer-heading {
  margin-bottom: 14px;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.footer-links {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  color: var(--color-ink-muted);
  text-decoration: none;
}

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

.footer-bottom {
  display: flex;
  margin-top: 56px;
  padding-top: 22px;
  padding-bottom: 28px;
  border-top: 1px solid var(--color-line);
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: var(--color-ink-muted);
  font-size: 13px;
}

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

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

.prose {
  overflow-wrap: break-word;
}

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

.prose h2 {
  margin-top: 2.1em;
}

.prose h3 {
  margin-top: 1.7em;
}

.prose a {
  overflow-wrap: anywhere;
}

.prose img {
  margin-inline: auto;
  border-radius: var(--radius-large);
}

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

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

@media (max-width: 960px) {
  .site-nav,
  .header-cta {
    display: none;
  }

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

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

  .feature-banner,
  .feature-banner.reverse {
    grid-template-columns: 1fr;
  }

  .feature-banner.reverse .feature-copy,
  .feature-banner.reverse .feature-visual {
    order: initial;
  }

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

@media (max-width: 768px) {
  h1 {
    font-size: clamp(24px, 7.7vw, 30px);
    line-height: 1.15;
  }

  h2 {
    font-size: clamp(26px, 8vw, 34px);
  }

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

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15.5px;
  }

  .wrap,
  .reading-wrap {
    padding-inline: max(16px, var(--gutter));
  }

  .header-shell {
    gap: 12px;
    padding-inline: 16px;
  }

  .site-brand {
    font-size: 17px;
  }

  .site-brand img {
    width: 26px;
    height: 26px;
  }

  .header-tools {
    margin-left: auto;
    gap: 4px;
  }

  .mobile-nav {
    right: 16px;
    left: 16px;
  }

  .button-row {
    justify-content: center;
  }

  .button {
    flex: 1 1 180px;
  }

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

  .feature-banner {
    padding: 26px 20px;
  }

  .feature-visual {
    min-height: 240px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

  .tilt-small {
    transform: none;
  }

  th,
  td {
    padding: 13px 14px;
  }
}

@media (max-width: 390px) {
  .site-brand span {
    display: none;
  }

  .button {
    width: 100%;
    flex-basis: 100%;
  }
}

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

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

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