:root {
  --color-bg: #F7FBFD;
  --color-panel: #FFFFFF;
  --color-panel-alt: #EFF4F9;
  --color-border: #E1E8F0;
  --color-accent: #4C63E6;
  --color-accent-dark: #3849C2;
  --color-accent-soft: #EEF1FD;
  --color-text: #0F1728;
  --color-muted: #5B6577;
  --color-success: #1FA971;
  --color-success-soft: #E6F6EF;
  --color-warning: #E5A13A;
  --color-warning-soft: #FFF4DF;
  --color-error: #DD4A57;
  --color-error-soft: #FDECEF;
  --color-overlay: rgba(15, 23, 40, .28);
  --color-glow-blue: rgba(107, 124, 245, .10);
  --color-glow-purple: rgba(176, 107, 240, .07);
  --color-shadow-card: rgba(64, 84, 140, .12);
  --color-shadow-soft: rgba(64, 84, 140, .10);
  --color-shadow-light: rgba(64, 84, 140, .06);
  --color-shadow-button: rgba(76, 99, 230, .26);
  --color-shadow-control: rgba(15, 23, 40, .18);
  --gradient-accent: linear-gradient(92deg, #B06BF0 0%, #6B7CF5 52%, #4CA0FF 100%);
  --gradient-page: radial-gradient(900px 520px at 78% 10%, var(--color-glow-blue), transparent 70%), radial-gradient(720px 480px at 10% 72%, var(--color-glow-purple), transparent 70%);
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Hiragino Sans', 'Apple SD Gothic Neo', 'Malgun Gothic', system-ui, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Hiragino Sans', 'Apple SD Gothic Neo', 'Malgun Gothic', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Menlo, Consolas, 'Liberation Mono', monospace;
  --radius-2xl: 28px;
  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --radius-button: 14px;
  --radius-pill: 999px;
  --shadow-card: 0 32px 80px var(--color-shadow-card), 0 2px 6px var(--color-shadow-light);
  --shadow-soft: 0 24px 64px var(--color-shadow-soft);
  --shadow-button: 0 10px 24px var(--color-shadow-button);
  --shadow-control: 0 1px 2px var(--color-shadow-control);
  --header-height: 72px;
  --content-width: 1200px;
  --header-width: 1280px;
  --reading-width: 820px;
  --gutter: 40px;
  --section-space: 112px;
  --transition-fast: 160ms ease;
  --transition-medium: 420ms cubic-bezier(.2, .7, .2, 1);
}

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

html {
  margin: 0;
  padding: 0;
  color-scheme: light;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  padding: 0;
  overflow-x: clip;
  background: var(--gradient-page), var(--color-bg);
  color: var(--color-text);
  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,
figure,
figcaption {
  min-width: 0;
}

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

img {
  height: auto;
}

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

button {
  border: 0;
}

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

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

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

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

ul[role="list"],
ol[role="list"],
.site-nav-list,
.footer-link-list,
.mobile-nav-list,
.language-list,
.chip-list,
.platform-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

:not(pre) > code {
  padding: .12em .4em;
  border-radius: var(--radius-sm);
  background: var(--color-panel-alt);
  color: var(--color-text);
  font-size: .9em;
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  border-radius: var(--radius-md);
  background: var(--color-panel-alt);
  color: var(--color-text);
  font-size: 13px;
  line-height: 1.75;
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

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

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

th {
  background: var(--color-panel-alt);
  color: var(--color-text);
  font-size: 14px;
  font-weight: 600;
}

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

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

::selection {
  background: var(--color-accent-soft);
  color: var(--color-text);
}

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

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

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

.section-muted {
  background: var(--color-panel-alt);
  color: var(--color-text);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 44px;
}

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

.kicker {
  display: block;
  margin-bottom: 12px;
  color: var(--color-accent-dark);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.22;
  text-wrap: balance;
}

h1,
h2,
h3 {
  letter-spacing: -.015em;
}

h1 {
  margin: 0 0 20px;
  font-size: clamp(34px, 3.3vw, 48px);
  line-height: 1.18;
}

h2 {
  margin: 0 0 18px;
  font-size: clamp(28px, 3vw, 40px);
}

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

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

p {
  margin-bottom: 1.2em;
}

.lead {
  max-width: 700px;
  color: var(--color-muted);
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.7;
}

.lead strong,
.prose strong {
  color: var(--color-text);
  font-weight: 600;
}

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

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

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

.gradient-text {
  display: inline-block;
  padding-right: .04em;
  background: var(--gradient-accent);
  background-clip: text;
  color: transparent;
  -webkit-background-clip: text;
}

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

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

.prose h2,
.prose h3,
.prose h4 {
  color: var(--color-text);
}

.prose h2 {
  margin-top: 72px;
  padding-top: 8px;
}

.prose h3 {
  margin-top: 40px;
}

.prose a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.prose li {
  margin-bottom: 8px;
}

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

.card,
.panel {
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
}

.card {
  padding: 28px;
}

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

.card-bordered {
  border: 1px solid var(--color-border);
  box-shadow: none;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

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

.button {
  display: inline-flex;
  min-height: 48px;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-button);
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.25;
  text-align: center;
  transition: transform var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.button.button-primary {
  background: var(--color-accent);
  color: var(--color-panel);
  box-shadow: var(--shadow-button);
}

.button.button-primary:hover {
  background: var(--color-accent-dark);
  color: var(--color-panel);
  transform: translateY(-1px);
}

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

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

.button-soft {
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
}

.button-soft:hover {
  background: var(--color-panel-alt);
  color: var(--color-accent-dark);
}

.button[aria-disabled="true"],
.button:disabled {
  cursor: not-allowed;
  box-shadow: none;
  opacity: .58;
  transform: none;
}

.badge,
.chip {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  border-radius: var(--radius-pill);
  line-height: 1.3;
}

.badge {
  padding: 7px 12px;
  border: 1px solid var(--color-border);
  background: var(--color-panel);
  color: var(--color-muted);
  font-size: 13px;
}

.chip {
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  background: var(--color-panel);
  color: var(--color-muted);
  font-size: 12.5px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

.status-dot {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-success);
}

.chip-list,
.platform-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

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

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

/* Shared header */
.site-header {
  position: relative;
  z-index: 80;
  height: var(--header-height);
}

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

.site-brand {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 12px;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -.01em;
}

.site-brand img {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.desktop-nav {
  margin-left: auto;
}

.site-nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav-item {
  position: relative;
}

.site-nav-link,
.nav-more-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 6px;
  padding: 0 14px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  font-size: 15px;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-nav-link:hover,
.nav-more-button:hover,
.site-nav-link[aria-current="page"],
.nav-more-button.is-active {
  background: var(--color-panel-alt);
  color: var(--color-text);
}

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

.nav-more-button svg,
.language-button svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.nav-more-button[aria-expanded="true"] svg,
.language-button[aria-expanded="true"] svg {
  transform: rotate(180deg);
}

.nav-dropdown,
.language-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  min-width: 188px;
  padding: 8px;
  visibility: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}

.nav-dropdown {
  left: 0;
}

.language-dropdown {
  right: 0;
}

.nav-dropdown.is-open,
.language-dropdown.is-open {
  visibility: visible;
  opacity: 1;
  transform: none;
}

.nav-dropdown a,
.language-dropdown a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
  font-size: 14px;
}

.nav-dropdown a:hover,
.language-dropdown a:hover,
.language-dropdown a[aria-current="true"] {
  background: var(--color-panel-alt);
  color: var(--color-text);
}

.header-tools {
  position: relative;
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 8px;
}

.language-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 6px;
  padding: 0 12px 0 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-muted);
  cursor: pointer;
  font-size: 14px;
}

.language-short {
  display: none;
}

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-text);
  cursor: pointer;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.menu-toggle-lines {
  position: relative;
}

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

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

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

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

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::before {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::after {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-nav {
  display: none;
}

.mobile-nav-veil {
  display: none;
}

/* Shared footer */
.site-footer {
  padding-top: 76px;
  padding-bottom: 28px;
  background: var(--color-panel);
  color: var(--color-text);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.35fr .8fr 1.2fr .8fr;
  gap: 48px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
}

.footer-brand img {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

.footer-summary {
  max-width: 360px;
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.75;
}

.footer-title {
  margin: 4px 0 16px;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 600;
}

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

.footer-link-list a {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  color: var(--color-muted);
  font-size: 14px;
}

.footer-link-list a:hover {
  color: var(--color-accent-dark);
}

.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-keywords a {
  display: inline-flex;
  max-width: 100%;
  min-height: 34px;
  align-items: center;
  padding: 5px 11px;
  border-radius: var(--radius-pill);
  background: var(--color-panel-alt);
  color: var(--color-muted);
  font-size: 12.5px;
  line-height: 1.35;
}

.footer-keywords a:hover {
  color: var(--color-accent-dark);
}

.footer-bottom {
  display: flex;
  margin-top: 52px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: var(--color-muted);
  font-size: 13px;
}

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

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

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

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

@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;
  }
}

@media (max-width: 980px) {
  :root {
    --section-space: 88px;
  }

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

  .desktop-nav,
  .desktop-language {
    display: none;
  }

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

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

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

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

  .mobile-nav {
    position: fixed;
    z-index: 90;
    top: var(--header-height);
    right: 0;
    left: 0;
    display: block;
    max-height: calc(100dvh - var(--header-height));
    padding: 14px var(--gutter) 24px;
    overflow-y: auto;
    overscroll-behavior: contain;
    visibility: hidden;
    border-top: 1px solid var(--color-border);
    background: var(--color-panel);
    color: var(--color-text);
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  }

  .mobile-nav.is-open {
    visibility: visible;
    opacity: 1;
    transform: none;
  }

  .mobile-nav-list {
    display: grid;
    gap: 4px;
  }

  .mobile-nav-list a {
    display: flex;
    width: 100%;
    min-height: 48px;
    align-items: center;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-muted);
  }

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

  .mobile-language-title {
    margin: 18px 12px 8px;
    color: var(--color-muted);
    font-size: 12px;
    letter-spacing: .08em;
  }

  .mobile-language-list {
    display: grid;
    margin: 0;
    padding: 0;
    list-style: none;
  }

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

@media (max-width: 768px) {
  :root {
    --gutter: 20px;
    --section-space: 72px;
  }

  h1 {
    font-size: clamp(24px, 7vw, 30px);
    line-height: 1.2;
  }

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

  h3 {
    font-size: 20px;
  }

  .lead {
    font-size: 17px;
  }

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

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

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

  .footer-inner {
    gap: 36px 28px;
  }
}

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

  body {
    font-size: 15px;
  }

  .site-header-inner {
    gap: 10px;
  }

  .site-brand span {
    max-width: 164px;
    line-height: 1.2;
  }

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

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

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

  .button-row .button {
    flex: 1 1 148px;
  }

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

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

  .tilt-card {
    transform: none;
  }

  pre {
    padding: 16px;
    font-size: 12px;
  }

  th,
  td {
    min-width: 150px;
    padding: 12px;
  }
}