:root {
  --bg: #FFFFFF;
  --bg-panel: #F7F7FA;
  --bg-panel-2: #F0EFF5;
  --border: #E6E4EE;
  --accent: #6E30F2;
  --accent-dark: #4B1BC4;
  --accent-soft: #F1EBFE;
  --text: #17141F;
  --text-muted: #5F5B6E;
  --success: #1FA971;
  --warn: #DE9B00;
  --error: #DE3B3B;
  --cta: #C9F73F;
  --cta-ink: #1B2405;
  --white: #FFFFFF;
  --black-clear: rgba(0, 0, 0, 0);
  --hero-deep: #2E1065;
  --hero-mid: #6E30F2;
  --hero-pale: #B9A7F5;
  --hero-title-soft: #E7E0FB;
  --hero-ink: rgba(255, 255, 255, 0.86);
  --hero-ink-dim: rgba(255, 255, 255, 0.68);
  --hero-border: rgba(255, 255, 255, 0.28);
  --hero-pill: rgba(255, 255, 255, 0.11);
  --hero-pill-hover: rgba(255, 255, 255, 0.19);
  --header-solid: #2E1065;
  --drawer-veil: rgba(23, 20, 31, 0.54);
  --field-border: #DCD6EE;
  --field-bg: #FBFAFE;
  --code-bg: #24114B;
  --code-text: #F5F1FF;
  --code-key: #C7AFFF;
  --code-string: #76E0B7;
  --code-punctuation: #BBB3D1;
  --selection-bg: #DCCFFE;
  --selection-text: #271052;
  --panel-ring: rgba(255, 255, 255, 0.38);
  --panel-ring-soft: rgba(255, 255, 255, 0.14);
  --shadow-card: 0 16px 42px rgba(26, 8, 74, 0.13);
  --shadow-card-hover: 0 22px 58px rgba(26, 8, 74, 0.18);
  --shadow-hero-card: 0 14px 36px rgba(26, 8, 74, 0.26);
  --shadow-hero-panel: 0 36px 90px rgba(26, 8, 74, 0.40), 0 12px 30px rgba(26, 8, 74, 0.22);
  --shadow-button: 0 12px 28px rgba(20, 8, 54, 0.28);
  --shadow-fab: 0 16px 38px rgba(75, 27, 196, 0.38);
  --radius-panel: 28px;
  --radius-card: 24px;
  --radius-control: 14px;
  --radius-small: 10px;
  --radius-pill: 999px;
  --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;
  --wrap: 1180px;
  --reading: 820px;
  --header-wide: 1280px;
  --header-height: 74px;
  --gutter: clamp(16px, 4vw, 32px);
  --section-space: clamp(72px, 10vw, 132px);
  --transition-fast: 180ms ease;
  --transition-medium: 360ms cubic-bezier(0.2, 0.72, 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 {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

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

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

svg[aria-hidden="true"] {
  flex-shrink: 0;
}

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

button,
select {
  cursor: pointer;
}

button {
  border: 0;
}

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

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

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

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

p,
ul,
ol,
pre,
table,
blockquote {
  margin-top: 0;
  margin-bottom: 1.25em;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--text);
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.18;
  text-wrap: balance;
}

h1,
.hero-title {
  font-size: clamp(34px, 4.2vw, 48px);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(28px, 3.2vw, 40px);
  letter-spacing: -0.018em;
}

h3 {
  font-size: clamp(21px, 2.2vw, 28px);
  letter-spacing: -0.01em;
}

h4 {
  font-size: 18px;
}

.title-lock,
.no-break {
  white-space: nowrap;
}

small {
  font-size: 0.875em;
}

strong {
  font-weight: 750;
}

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

:not(pre) > code {
  max-width: 100%;
  padding: 0.12em 0.38em;
  border-radius: var(--radius-small);
  background: var(--bg-panel-2);
  color: var(--accent-dark);
  font-size: 0.9em;
  overflow-wrap: anywhere;
}

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

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

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

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

th {
  background: var(--bg-panel-2);
  color: var(--text);
  font-weight: 750;
}

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

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

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 3px solid var(--cta);
  outline-offset: 3px;
}

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

.reading-wrap {
  width: 100%;
  max-width: calc(var(--reading) + 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-compact {
  padding-top: clamp(52px, 7vw, 84px);
  padding-bottom: clamp(52px, 7vw, 84px);
}

.section-head {
  max-width: 760px;
  margin-bottom: clamp(36px, 5vw, 64px);
}

.eyebrow {
  margin-bottom: 14px;
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.lede {
  max-width: 720px;
  color: var(--text-muted);
  font-size: clamp(17px, 2vw, 20px);
}

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

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

.grid > *,
.flex-row > * {
  min-width: 0;
}

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

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

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.flex-row {
  display: flex;
  align-items: center;
  gap: 16px;
}

.panel,
.card {
  min-width: 0;
  border-radius: var(--radius-card);
  background: var(--bg);
  color: var(--text);
  box-shadow: var(--shadow-card);
}

.panel {
  padding: clamp(24px, 4vw, 44px);
}

.card {
  padding: 26px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

.card-soft {
  background: var(--bg-panel);
  color: var(--text);
  box-shadow: none;
}

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

.tilt,
.tilt-left,
.tilt-right {
  transform: none;
}

.button,
.btn {
  display: inline-flex;
  min-height: 48px;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 22px;
  border: 1px solid var(--black-clear);
  border-radius: var(--radius-control);
  background: var(--accent);
  color: var(--white);
  font-weight: 750;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition: transform var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.button:hover,
.btn:hover {
  transform: translateY(-2px);
  background: var(--accent-dark);
  color: var(--white);
}

.button-primary {
  background: var(--accent);
  color: var(--white);
}

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

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

.button-cta {
  background: var(--cta);
  color: var(--cta-ink);
  box-shadow: var(--shadow-button);
}

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

.button-ghost {
  border-color: var(--hero-border);
  background: var(--hero-deep);
  color: var(--white);
}

.button-ghost:hover {
  background: var(--accent-dark);
  color: var(--white);
}

.button:disabled,
.button.is-disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

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

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

.chip-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.chip {
  display: inline-flex;
  min-width: 0;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border-radius: var(--radius-pill);
  background: var(--bg-panel-2);
  color: var(--text);
  font-size: 13px;
  font-weight: 650;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

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

.site-header {
  position: relative;
  z-index: 90;
  width: 100%;
  min-height: var(--header-height);
  background: linear-gradient(110deg, var(--hero-deep), var(--accent-dark));
  color: var(--white);
}

.site-header.is-overlay {
  position: absolute;
  inset: 0 0 auto;
  background: var(--hero-deep);
}

.header-shell {
  position: relative;
  display: flex;
  width: 100%;
  max-width: min(100%, calc(var(--header-wide) + 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(--white);
  font-weight: 800;
  text-decoration: none;
}

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

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

.site-brand-name {
  white-space: nowrap;
}

.desktop-nav {
  display: flex;
  margin-left: auto;
  align-items: center;
  gap: 2px;
}

.desktop-nav a {
  position: relative;
  display: flex;
  min-height: 44px;
  align-items: center;
  padding: 10px 12px;
  color: var(--hero-ink-dim);
  font-size: 14px;
  font-weight: 550;
  text-decoration: none;
}

.desktop-nav a:hover,
.desktop-nav a.is-active {
  color: var(--white);
}

.desktop-nav a::after {
  position: absolute;
  right: 12px;
  bottom: 4px;
  left: 12px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--white);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

.desktop-nav a:hover::after,
.desktop-nav a.is-active::after {
  transform: scaleX(1);
}

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

.language-picker {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid var(--hero-border);
  border-radius: var(--radius-pill);
  background: var(--hero-pill);
  color: var(--white);
  white-space: nowrap;
}

.language-button:hover {
  background: var(--hero-pill-hover);
}

.language-short {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 184px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius-control);
  background: var(--bg);
  color: var(--text);
  box-shadow: var(--shadow-card);
}

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 9px 12px;
  border-radius: var(--radius-small);
  color: var(--text);
  text-decoration: none;
}

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

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-control);
  background: var(--hero-pill);
  color: var(--white);
}

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

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

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

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

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

.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 {
  display: none;
}

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

.site-footer {
  position: relative;
  padding-top: 72px;
  padding-bottom: 28px;
  overflow-x: clip;
  background: var(--hero-deep);
  color: var(--hero-ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.3fr 0.9fr;
  gap: 44px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 11px;
  margin-bottom: 18px;
  color: var(--white);
  font-weight: 800;
  text-decoration: none;
}

.footer-brand:hover {
  color: var(--white);
}

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

.footer-intro {
  max-width: 320px;
  color: var(--hero-ink-dim);
}

.footer-title {
  margin-bottom: 16px;
  color: var(--white);
  font-size: 14px;
  font-weight: 750;
}

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

.footer-links a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  color: var(--hero-ink);
  text-decoration: none;
}

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

.footer-bottom {
  display: flex;
  margin-top: 52px;
  padding-top: 22px;
  border-top: 1px solid var(--hero-border);
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: var(--hero-ink-dim);
  font-size: 13px;
}

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

.footer-legal a {
  color: var(--hero-ink);
  text-decoration: none;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 620ms ease, transform 620ms cubic-bezier(0.2, 0.72, 0.2, 1);
}

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

.prose {
  min-width: 0;
  color: var(--text);
}

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

.prose h2 {
  margin-top: 2.2em;
  scroll-margin-top: 96px;
}

.prose h3 {
  margin-top: 1.7em;
  scroll-margin-top: 96px;
}

.prose a {
  overflow-wrap: anywhere;
}

.prose img {
  height: auto;
  border-radius: var(--radius-control);
}

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

@media (max-width: 1040px) {
  .desktop-nav {
    display: none;
  }

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

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

  .mobile-nav-veil {
    position: fixed;
    z-index: 80;
    inset: var(--header-height) 0 0;
    background: var(--drawer-veil);
  }

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

  .mobile-nav {
    position: absolute;
    z-index: 95;
    top: 100%;
    right: var(--gutter);
    left: var(--gutter);
    max-height: calc(100dvh - var(--header-height) - 12px);
    padding: 12px;
    overflow-y: auto;
    overscroll-behavior: contain;
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    background: var(--bg);
    color: var(--text);
    box-shadow: var(--shadow-card);
  }

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

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

  .mobile-nav a {
    display: flex;
    width: 100%;
    min-height: 48px;
    align-items: center;
    padding: 11px 14px;
    border-radius: var(--radius-small);
    color: var(--text);
    font-weight: 650;
    text-decoration: none;
  }

  .mobile-nav a:hover,
  .mobile-nav a.is-active,
  .mobile-nav a[aria-current="true"] {
    background: var(--accent-soft);
    color: var(--accent-dark);
  }

  .mobile-language-list {
    margin-top: 10px !important;
    padding-top: 10px !important;
    border-top: 1px solid var(--border);
  }

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

@media (max-width: 768px) {
  h1,
  .hero-title {
    font-size: clamp(24px, 7vw, 30px);
    line-height: 1.22;
  }

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

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

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

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

@media (max-width: 640px) {
  .wrap,
  .reading-wrap,
  .header-shell {
    padding-inline: var(--gutter);
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .button-row {
    align-items: stretch;
    flex-direction: column;
  }

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

  .chip-row {
    flex-direction: row;
    justify-content: flex-start;
  }

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

  .tilt,
  .tilt-left,
  .tilt-right,
  [class*="tilt"] {
    transform: none !important;
  }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 34px;
  }

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

  pre {
    padding: 18px 16px;
    font-size: 12.5px;
  }
}

@media (max-width: 390px) {
  .site-brand-name {
    max-width: 126px;
    white-space: normal;
    line-height: 1.15;
  }

  .header-shell {
    gap: 8px;
  }

  .header-tools {
    gap: 5px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

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