:root {
  --color-canvas: #FFFFFF;
  --color-panel: #F7F8FA;
  --color-panel-strong: #EEF0F6;
  --color-border: #E4E6EE;
  --color-accent: #5A47EE;
  --color-accent-bright: #3E8BF7;
  --color-accent-deep: #3B2BC6;
  --color-ink: #1B1D29;
  --color-ink-muted: #5E6273;
  --color-success: #17A56D;
  --color-warning: #D9880B;
  --color-error: #D9364C;
  --color-on-accent: #FFFFFF;
  --color-success-surface: #E5F5EE;
  --color-success-border: #C4E8D8;
  --color-warning-surface: #FFF4DD;
  --color-error-surface: #FDECEF;
  --color-accent-surface: #EEEBFD;
  --color-neutral-surface: #F1F2F7;
  --color-code-bg: #202231;
  --color-code-ink: #F7F8FA;
  --color-code-key: #AFA5FF;
  --color-code-string: #82C2FF;
  --color-code-comment: #AEB2C2;
  --color-stripe: rgba(90, 71, 238, 0.32);
  --color-stripe-glow: rgba(90, 71, 238, 0.10);
  --color-shadow-soft: rgba(27, 29, 41, 0.07);
  --color-shadow-faint: rgba(27, 29, 41, 0.05);
  --color-shadow-accent: rgba(59, 43, 198, 0.16);
  --color-shadow-button: rgba(90, 71, 238, 0.30);
  --color-shadow-toggle: rgba(27, 29, 41, 0.22);
  --gradient-accent: linear-gradient(96deg, var(--color-accent) 8%, var(--color-accent-bright) 92%);
  --gradient-accent-hover: linear-gradient(96deg, var(--color-accent-deep) 8%, var(--color-accent-bright) 92%);
  --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-small: 10px;
  --radius-control: 14px;
  --radius-card: 16px;
  --radius-large: 20px;
  --radius-panel: 24px;
  --radius-pill: 999px;
  --shadow-card: 0 2px 6px var(--color-shadow-faint), 0 10px 28px var(--color-shadow-soft);
  --shadow-deep: 0 4px 10px var(--color-shadow-soft), 0 24px 56px var(--color-shadow-accent);
  --shadow-button: 0 6px 18px var(--color-shadow-button);
  --content-width: 1160px;
  --header-width: 1280px;
  --reading-width: 780px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-height: 76px;
  --section-space: clamp(72px, 9vw, 124px);
  --transition-fast: 160ms ease;
  --transition-base: 260ms ease;
}

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

html {
  scroll-behavior: smooth;
  background: var(--color-canvas);
}

html.nav-open {
  overflow: hidden;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

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

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

img {
  height: auto;
}

a {
  color: var(--color-accent-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

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

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

button {
  border: 0;
}

ul,
ol {
  padding-left: 1.4em;
}

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

h1,
h2,
h3,
h4,
p,
figure,
blockquote,
pre,
table {
  margin-top: 0;
}

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

h1 {
  margin-bottom: 24px;
  font-size: clamp(34px, 3.3vw, 48px);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.18;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 800;
  letter-spacing: -0.012em;
  line-height: 1.22;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(20px, 2vw, 25px);
  font-weight: 750;
  line-height: 1.35;
}

h4 {
  margin-bottom: 8px;
  font-size: 18px;
  font-weight: 700;
}

p {
  margin-bottom: 1.15em;
}

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

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

:not(pre) > code {
  padding: 0.12em 0.38em;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-panel);
  color: var(--color-accent-deep);
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  padding: 22px;
  overflow-x: auto;
  border-radius: var(--radius-card);
  background: var(--color-code-bg);
  color: var(--color-code-ink);
  font: 14px/1.75 var(--font-mono);
  tab-size: 2;
  -webkit-overflow-scrolling: touch;
}

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

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

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

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

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

::selection {
  background: var(--color-accent-surface);
  color: var(--color-ink);
}

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

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

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

.eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  background: var(--gradient-accent);
  color: var(--color-accent-deep);
  font-size: 14px;
  font-weight: 750;
  letter-spacing: 0.07em;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.lead {
  max-width: 720px;
  color: var(--color-ink-muted);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.8;
}

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

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

.no-break {
  white-space: nowrap;
}

.gradient-text {
  background: var(--gradient-accent);
  color: var(--color-accent-deep);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stack {
  display: grid;
  gap: 24px;
}

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

.grid-2,
.grid-3 {
  display: grid;
  gap: 24px;
}

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

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

.card,
.panel {
  border: 1px solid var(--color-border);
  background: var(--color-canvas);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
}

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

.panel {
  padding: clamp(26px, 4vw, 44px);
  border-radius: var(--radius-panel);
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 25px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 650;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

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

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

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

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

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

.button-text {
  min-height: 44px;
  padding-inline: 4px;
  background: transparent;
  color: var(--color-ink);
}

.button-text:hover {
  color: var(--color-accent-deep);
}

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

.badge {
  display: inline-flex;
  max-width: 100%;
  min-height: 28px;
  align-items: center;
  gap: 7px;
  padding: 4px 11px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-canvas);
  color: var(--color-ink-muted);
  font-size: 12px;
  font-weight: 650;
  line-height: 1.3;
}

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

.badge-accent {
  border-color: var(--color-accent-surface);
  background: var(--color-accent-surface);
  color: var(--color-accent-deep);
}

.badge-success {
  border-color: var(--color-success-border);
  background: var(--color-success-surface);
  color: var(--color-success);
}

.badge-warning {
  border-color: var(--color-warning);
  background: var(--color-warning-surface);
  color: var(--color-warning);
}

.badge-error {
  border-color: var(--color-error);
  background: var(--color-error-surface);
  color: var(--color-error);
}

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

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-canvas);
  color: var(--color-ink);
  font-size: 15px;
}

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

.data-table th {
  background: var(--color-panel);
  color: var(--color-ink);
  font-weight: 700;
}

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

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 560ms ease, transform 560ms ease;
}

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

.site-head {
  position: relative;
  z-index: 100;
  border-bottom: 1px solid transparent;
  background: var(--color-canvas);
  color: var(--color-ink);
}

.header-row {
  display: flex;
  width: 100%;
  max-width: min(100%, calc(var(--header-width) + var(--gutter) * 2));
  height: var(--header-height);
  margin-inline: auto;
  padding-inline: var(--gutter);
  align-items: center;
  gap: 20px;
}

.site-brand {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 11px;
  color: var(--color-ink);
  text-decoration: none;
}

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

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

.site-brand-name {
  font: 800 19px/1.2 var(--font-display);
  letter-spacing: 0.01em;
}

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

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

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

.site-nav-link,
.nav-more-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 5px;
  padding: 9px 14px;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-ink-muted);
  font-size: 15px;
  font-weight: 520;
  text-decoration: none;
  cursor: pointer;
}

.site-nav-link:hover,
.nav-more-button:hover {
  background: var(--color-panel);
  color: var(--color-ink);
}

.site-nav-link.is-active,
.nav-more-button.is-active {
  color: var(--color-ink);
  font-weight: 680;
}

.nav-caret {
  font-size: 11px;
}

.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  display: none;
  width: 190px;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-control);
  background: var(--color-canvas);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
}

.site-nav-item:hover .nav-dropdown,
.site-nav-item:focus-within .nav-dropdown {
  display: block;
}

.nav-dropdown a {
  display: block;
  width: 100%;
  min-height: 48px;
  padding: 8px 12px;
  border-radius: var(--radius-small);
  color: var(--color-ink);
  text-decoration: none;
}

.nav-dropdown a:hover,
.nav-dropdown a.is-active {
  background: var(--color-panel);
  color: var(--color-accent-deep);
}

.nav-hint {
  display: block;
  color: var(--color-ink-muted);
  font-size: 12px;
  font-weight: 400;
}

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

.language-menu {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-canvas);
  color: var(--color-ink);
  cursor: pointer;
}

.language-button svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.language-label-short {
  display: none;
}

.language-popover {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  display: none;
  width: 168px;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-control);
  background: var(--color-canvas);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
}

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

.language-popover a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-small);
  color: var(--color-ink);
  text-decoration: none;
}

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

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  background: var(--color-canvas);
  color: var(--color-ink);
  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: var(--color-ink);
}

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

.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;
}

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

.mobile-drawer {
  position: fixed;
  z-index: 110;
  top: var(--header-height);
  right: 0;
  left: 0;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  padding: 12px var(--gutter) 24px;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-top: 1px solid var(--color-border);
  background: var(--color-canvas);
  color: var(--color-ink);
  box-shadow: var(--shadow-card);
}

.mobile-nav-list a {
  display: flex;
  width: 100%;
  min-height: 50px;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: var(--radius-small);
  color: var(--color-ink);
  font-weight: 600;
  text-decoration: none;
}

.mobile-nav-list a:hover,
.mobile-nav-list a.is-active {
  background: var(--color-panel);
  color: var(--color-accent-deep);
}

.mobile-language-title {
  margin: 16px 12px 6px;
  color: var(--color-ink-muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.mobile-language-list a {
  font-weight: 500;
}

.site-footer {
  overflow-x: clip;
  border-top: 1px solid var(--color-border);
  background: var(--color-panel);
  color: var(--color-ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.25fr 1fr;
  gap: 48px;
  padding-top: 64px;
  padding-bottom: 52px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--color-ink);
  font: 800 18px/1.2 var(--font-display);
  text-decoration: none;
}

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

.footer-intro {
  max-width: 320px;
  margin-top: 18px;
  color: var(--color-ink-muted);
  font-size: 14px;
}

.footer-title {
  margin-bottom: 15px;
  color: var(--color-ink);
  font-size: 14px;
  font-weight: 750;
}

.footer-links {
  display: grid;
  gap: 7px;
}

.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-accent-deep);
}

.footer-bottom {
  display: flex;
  min-height: 70px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--color-border);
  color: var(--color-ink-muted);
  font-size: 13px;
}

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

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

.prose h2,
.prose h3,
.prose h4 {
  margin-top: 2em;
  color: var(--color-ink);
}

.prose a {
  overflow-wrap: anywhere;
}

.prose li + li {
  margin-top: 0.55em;
}

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

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

@media (max-width: 1080px) {
  .desktop-nav {
    display: none;
  }

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

  .menu-toggle {
    display: block;
  }

  .site-head.menu-open .mobile-drawer,
  .site-head.menu-open + .mobile-veil,
  .mobile-veil.is-visible {
    display: block;
  }

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

@media (max-width: 768px) {
  h1 {
    font-size: clamp(24px, 7vw, 30px);
    letter-spacing: -0.01em;
  }

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

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

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

  .language-label-full {
    display: none;
  }

  .language-label-short {
    display: inline;
  }

  .footer-grid {
    gap: 34px;
  }
}

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

  body {
    font-size: 15px;
  }

  .header-row {
    gap: 10px;
  }

  .site-brand img {
    width: 31px;
    height: 31px;
  }

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

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

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

  .button {
    max-width: 100%;
  }

  .card,
  .panel {
    padding: 21px;
  }

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

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding-top: 20px;
    padding-bottom: 20px;
  }
}

@media (max-width: 380px) {
  .site-brand-name {
    display: none;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }

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