:root {
  --color-bg: #F6F9FD;
  --color-panel: #FFFFFF;
  --color-panel-soft: #EEF3FA;
  --color-panel-tint: #FBFCFE;
  --color-border: #E1E8F2;
  --color-accent: #5D5AF0;
  --color-accent-dark: #4340C4;
  --color-accent-soft: #EEEEFE;
  --color-gradient-from: #8B5CF6;
  --color-gradient-to: #4D7CF6;
  --color-text: #1B2237;
  --color-muted: #5A6478;
  --color-success: #1F9D6B;
  --color-warn: #D98A0F;
  --color-error: #D64545;
  --color-white: #FFFFFF;
  --color-accent-a06: rgba(77, 124, 246, 0.06);
  --color-accent-a08: rgba(77, 124, 246, 0.08);
  --color-accent-a10: rgba(93, 90, 240, 0.10);
  --color-accent-a14: rgba(93, 90, 240, 0.14);
  --color-accent-a16: rgba(93, 90, 240, 0.16);
  --color-accent-a28: rgba(93, 90, 240, 0.28);
  --color-accent-a34: rgba(93, 90, 240, 0.34);
  --color-success-a08: rgba(31, 157, 107, 0.08);
  --color-success-a09: rgba(31, 157, 107, 0.09);
  --color-success-a16: rgba(31, 157, 107, 0.16);
  --color-warn-a10: rgba(217, 138, 15, 0.10);
  --color-error-a10: rgba(214, 69, 69, 0.10);
  --color-text-a12: rgba(27, 34, 55, 0.12);
  --color-text-a20: rgba(27, 34, 55, 0.20);
  --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, 'Courier New', monospace;
  --radius-sm: 10px;
  --radius-button: 12px;
  --radius-card: 20px;
  --radius-device: 24px;
  --radius-section: 32px;
  --radius-pill: 999px;
  --shadow-soft: 0 2px 6px var(--color-accent-a06), 0 10px 24px var(--color-accent-a08);
  --shadow-card: 0 8px 30px var(--color-accent-a08);
  --shadow-device: 0 4px 10px var(--color-accent-a06), 0 22px 48px var(--color-accent-a14), 0 48px 96px var(--color-accent-a10);
  --shadow-button: 0 6px 16px var(--color-accent-a28);
  --gutter: clamp(16px, 4vw, 32px);
  --content-width: 1120px;
  --reading-width: 820px;
  --header-height: 68px;
  --ease-standard: 180ms ease;
}

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

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

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  background:
    radial-gradient(900px 420px at 22% -8%, var(--color-accent-a06), transparent 62%),
    radial-gradient(1000px 460px at 80% -6%, var(--color-accent-a08), transparent 64%),
    var(--color-bg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

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

svg[data-background-art] {
  width: 100%;
  height: 100%;
}

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

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

button {
  border: 0;
}

a {
  color: var(--color-accent-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

p,
ul,
ol,
figure,
blockquote,
pre {
  margin: 0 0 1.15em;
}

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

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  line-height: 1.2;
  text-wrap: balance;
}

h1 {
  font-size: clamp(34px, 3.3vw, 48px);
  font-weight: 600;
  letter-spacing: 0.01em;
}

h2 {
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 600;
}

h3 {
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 600;
}

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

.title-keep,
.nowrap-keyword {
  white-space: nowrap;
}

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

strong {
  color: var(--color-text);
  font-weight: 600;
}

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

code {
  overflow-wrap: anywhere;
}

:not(pre) > code {
  padding: 0.12em 0.38em;
  border-radius: 6px;
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
  font-size: 0.9em;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 18px 20px;
  border-radius: var(--radius-card);
  color: var(--color-text);
  background: var(--color-panel-soft);
  font-size: 13px;
  line-height: 1.7;
  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: 13px 16px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

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

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

.wrap,
.reading-wrap {
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap {
  max-width: calc(var(--content-width) + var(--gutter) * 2);
}

.reading-wrap {
  max-width: calc(var(--reading-width) + var(--gutter) * 2);
}

.section {
  position: relative;
  padding-top: clamp(72px, 9vw, 124px);
  padding-bottom: clamp(72px, 9vw, 124px);
  overflow-x: clip;
}

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

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

.section-heading {
  max-width: 760px;
  margin-bottom: 42px;
}

.section-heading > p {
  margin-top: 14px;
  color: var(--color-muted);
  font-size: 17px;
}

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

.panel {
  padding: clamp(22px, 4vw, 40px);
}

.card {
  padding: 24px;
}

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

.stack {
  display: grid;
  gap: 20px;
}

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

.icon,
.dot,
.badge-icon {
  flex-shrink: 0;
}

.grad-word {
  color: transparent;
  background: linear-gradient(92deg, var(--color-gradient-from) 8%, var(--color-gradient-to) 88%);
  background-clip: text;
  -webkit-background-clip: text;
}

.eyebrow,
.badge,
.status-badge,
.tag {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  line-height: 1.3;
}

.eyebrow {
  padding: 6px 16px;
  color: var(--color-muted);
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
}

.eyebrow-dot {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-a14);
}

.badge,
.tag {
  padding: 5px 11px;
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
  font-weight: 600;
}

.badge--success {
  color: var(--color-success);
  background: var(--color-success-a09);
}

.badge--warn {
  color: var(--color-warn);
  background: var(--color-warn-a10);
}

.badge--error {
  color: var(--color-error);
  background: var(--color-error-a10);
}

.button,
.btn {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 28px;
  border: 1px solid transparent;
  border-radius: var(--radius-button);
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  transition: transform var(--ease-standard), box-shadow var(--ease-standard), background-color var(--ease-standard), border-color var(--ease-standard), color var(--ease-standard);
}

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

.button--primary,
.btn-primary {
  color: var(--color-white);
  background: linear-gradient(180deg, var(--color-accent), var(--color-accent-dark));
  box-shadow: var(--shadow-button);
}

.button--primary:hover,
.btn-primary:hover {
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: 0 10px 22px var(--color-accent-a34);
}

.button--secondary,
.btn-ghost {
  color: var(--color-text);
  background: var(--color-panel);
  border-color: var(--color-border);
  box-shadow: var(--shadow-soft);
}

.button--secondary:hover,
.btn-ghost:hover {
  color: var(--color-accent-dark);
  border-color: var(--color-accent);
}

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

.button:focus-visible,
.btn:focus-visible,
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-accent-a28);
  outline-offset: 3px;
}

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

.site-head {
  position: relative;
  z-index: 50;
  color: var(--color-text);
  background: transparent;
}

.site-head__inner {
  width: 100%;
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  min-height: var(--header-height);
  margin-inline: auto;
  padding: 12px var(--gutter);
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-brand {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  text-decoration: none;
}

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

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

.site-brand__name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.desktop-nav a {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  font-size: 14px;
  text-decoration: none;
}

.desktop-nav a:hover {
  color: var(--color-text);
  background: var(--color-panel-soft);
}

.desktop-nav a.is-current {
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
  font-weight: 600;
}

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

.language-button,
.menu-button {
  min-height: 44px;
  color: var(--color-muted);
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  cursor: pointer;
}

.language-button {
  min-width: 116px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: 13px;
}

.language-button__short {
  display: none;
}

.menu-button {
  min-width: 44px;
  display: none;
  place-items: center;
  padding: 9px;
  border-radius: 50%;
}

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

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 178px;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: 16px;
  color: var(--color-text);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.language-menu[hidden] {
  display: none;
}

.language-menu a {
  min-height: 44px;
  display: flex;
  width: 100%;
  align-items: center;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--color-muted);
  text-decoration: none;
}

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

.mobile-nav {
  display: none;
}

.mobile-nav__languages {
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
}

.mobile-nav__label {
  padding: 10px 14px 4px;
  color: var(--color-muted);
  font-size: 12px;
}

.nav-veil {
  display: none;
}

.site-footer {
  padding-top: 64px;
  color: var(--color-muted);
  background: var(--color-panel);
  border-top: 1px solid var(--color-border);
}

.site-footer__inner {
  width: 100%;
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.3fr 1fr;
  gap: 36px;
  padding-bottom: 48px;
}

.footer-brand p {
  max-width: 360px;
  margin-top: 16px;
  font-size: 14px;
}

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

.footer-links {
  display: grid;
  gap: 9px;
}

.footer-links a {
  width: fit-content;
  color: var(--color-muted);
  font-size: 14px;
  text-decoration: none;
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 22px 0 28px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
}

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

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

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 600ms ease, transform 600ms ease;
}

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

.prose {
  min-width: 0;
}

.prose > * + * {
  margin-top: 1.15em;
}

.prose h2 {
  margin-top: 2.4em;
}

.prose h3 {
  margin-top: 1.8em;
}

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

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

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

.tilt,
.tilt-card {
  transform: rotate(-0.35deg);
}

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

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

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

@media (max-width: 1100px) {
  .desktop-nav {
    gap: 0;
  }

  .desktop-nav a {
    padding-inline: 10px;
  }

  .site-brand__name {
    display: none;
  }

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

@media (max-width: 860px) {
  h1 {
    font-size: clamp(24px, 6vw, 30px);
  }

  .desktop-nav {
    display: none;
  }

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

  .menu-button {
    display: grid;
  }

  .mobile-nav {
    position: fixed;
    z-index: 60;
    top: var(--header-height);
    right: var(--gutter);
    left: var(--gutter);
    max-height: calc(100dvh - var(--header-height) - 16px);
    overflow-y: auto;
    padding: 10px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    color: var(--color-text);
    background: var(--color-panel);
    box-shadow: var(--shadow-device);
    overscroll-behavior: contain;
  }

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

  .mobile-nav a {
    min-height: 46px;
    display: flex;
    width: 100%;
    align-items: center;
    padding: 11px 14px;
    border-radius: 12px;
    color: var(--color-muted);
    text-decoration: none;
  }

  .mobile-nav a:hover,
  .mobile-nav a.is-current {
    color: var(--color-accent-dark);
    background: var(--color-accent-soft);
  }

  .nav-veil {
    position: fixed;
    z-index: 40;
    inset: var(--header-height) 0 0;
    background: var(--color-text-a12);
  }

  .nav-veil.is-visible {
    display: block;
  }

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

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

  body {
    font-size: 15px;
  }

  .site-head__inner {
    gap: 12px;
    padding-inline: var(--gutter);
  }

  .site-brand__name {
    display: inline;
    max-width: 132px;
    overflow-wrap: anywhere;
    white-space: normal;
    line-height: 1.25;
  }

  .language-button {
    min-width: 60px;
    padding-inline: 12px;
  }

  .language-button__full {
    display: none;
  }

  .language-button__short {
    display: inline;
  }

  .language-menu {
    display: none;
  }

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

  .panel,
  .card {
    padding: 20px;
  }

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

  .tilt,
  .tilt-card {
    transform: none;
  }

  .cluster {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .section {
    padding-top: 64px;
    padding-bottom: 64px;
  }
}