:root {
  --color-bg: #FFFFFF;
  --color-panel: #F6F7F9;
  --color-panel-strong: #EDF0F4;
  --color-border: #E3E6EB;
  --color-accent: #1B4FE8;
  --color-accent-dark: #1239B5;
  --color-accent-soft: rgba(27, 79, 232, 0.08);
  --color-text: #0B0C10;
  --color-muted: #5C6370;
  --color-dot: #D2D6DE;
  --color-success: #16A34A;
  --color-success-soft: rgba(22, 163, 74, 0.10);
  --color-warn: #D97706;
  --color-warn-soft: rgba(217, 119, 6, 0.10);
  --color-error: #DC2626;
  --color-error-soft: rgba(220, 38, 38, 0.09);
  --color-overlay: rgba(11, 12, 16, 0.44);
  --shadow-fine: 0 1px 2px rgba(11, 12, 16, 0.05);
  --shadow-layer: 0 2px 10px rgba(11, 12, 16, 0.04);
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Menlo, Consolas, 'Liberation Mono', monospace;
  --radius-pill: 999px;
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --content-width: 1200px;
  --reading-width: 820px;
  --header-width: 1280px;
  --header-height: 72px;
  --gutter: 24px;
  --section-space: 112px;
  --transition-fast: 150ms ease;
  --transition-reveal: 620ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

html.nav-open {
  overflow: hidden;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: hidden;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

img {
  height: auto;
}

svg {
  flex-shrink: 0;
}

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

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

button {
  border: 0;
  cursor: pointer;
}

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

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

p:last-child,
ul:last-child,
ol:last-child,
dl:last-child,
blockquote:last-child,
pre:last-child {
  margin-bottom: 0;
}

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

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

:not(pre) > code {
  padding: 0.12em 0.4em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-text);
  font-size: 0.88em;
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-text);
  font-size: 13px;
  line-height: 1.75;
  -webkit-overflow-scrolling: touch;
}

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

caption {
  padding-bottom: 12px;
  color: var(--color-muted);
  text-align: left;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.18;
  text-wrap: balance;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(34px, 3.4vw, 48px);
  letter-spacing: -0.015em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(29px, 3vw, 42px);
  letter-spacing: -0.012em;
}

h3 {
  margin-bottom: 14px;
  font-size: clamp(21px, 2vw, 28px);
}

h4 {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 500;
}

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

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

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

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

.section--panel {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
  color: var(--color-text);
}

.section-kicker {
  margin-bottom: 14px;
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-lead {
  max-width: 720px;
  margin-bottom: 36px;
  color: var(--color-muted);
  font-size: 18px;
}

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

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

.keyword-lock {
  white-space: nowrap;
}

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

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

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

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

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

.stack {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

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

.panel,
.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  color: var(--color-text);
}

.panel {
  padding: 32px;
}

.card {
  padding: 26px;
}

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

.card__eyebrow {
  margin-bottom: 10px;
  color: var(--color-accent);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.card__title {
  margin-bottom: 10px;
  font-size: 21px;
  font-weight: 500;
}

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

.button,
.btn {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 15px;
  font-weight: 500;
  line-height: 1;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

.button svg,
.btn svg {
  width: 16px;
  height: 16px;
}

.button:hover,
.btn:hover {
  transform: translateY(-1px);
}

.button:active,
.btn:active {
  transform: translateY(0);
}

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

.button--primary,
.btn-primary {
  background: var(--color-text);
  color: var(--color-bg);
}

.button--primary:hover,
.btn-primary:hover {
  background: var(--color-accent-dark);
  color: var(--color-bg);
}

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

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

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

.button--secondary:hover,
.btn-ghost:hover {
  border-color: var(--color-muted);
  background: var(--color-bg);
  color: var(--color-text);
}

.button--disabled,
.button[disabled] {
  border-color: var(--color-border);
  background: var(--color-panel-strong);
  color: var(--color-muted);
  cursor: not-allowed;
  transform: none;
}

.site-header {
  position: relative;
  z-index: 50;
  height: var(--header-height);
  border-bottom: 1px solid transparent;
  background: var(--color-bg);
  color: var(--color-text);
}

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

.site-brand {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.site-brand img {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.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-inline: 16px;
  border-radius: var(--radius-pill);
  color: var(--color-muted);
  font-size: 15px;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

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

.desktop-nav a[aria-current="page"] {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-weight: 500;
}

.header-tools {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 8px;
  margin-left: 18px;
}

.language-switch {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  gap: 6px;
  padding-inline: 16px 13px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-text);
  white-space: nowrap;
}

.language-button svg {
  width: 14px;
  height: 14px;
  color: var(--color-muted);
}

.language-short {
  display: none;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 53;
  display: none;
  width: 176px;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  box-shadow: var(--shadow-layer);
}

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

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 42px;
  align-items: center;
  padding-inline: 12px;
  border-radius: var(--radius-sm);
  color: var(--color-muted);
}

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

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  color: var(--color-text);
}

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

.mobile-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 48;
  display: none;
  background: var(--color-overlay);
}

.mobile-drawer {
  position: absolute;
  top: var(--header-height);
  right: var(--gutter);
  left: var(--gutter);
  z-index: 52;
  display: none;
  max-height: calc(100dvh - var(--header-height) - 16px);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  color: var(--color-text);
  box-shadow: var(--shadow-layer);
}

.mobile-drawer a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  padding-inline: 14px;
  border-radius: var(--radius-md);
  color: var(--color-muted);
}

.mobile-drawer a:hover,
.mobile-drawer a[aria-current="page"] {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

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

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

.site-footer {
  padding-top: 72px;
  padding-bottom: 28px;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1.2fr 0.8fr;
  gap: 48px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-size: 18px;
  font-weight: 500;
}

.footer-brand img {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.footer-intro {
  max-width: 330px;
  color: var(--color-muted);
}

.footer-heading {
  margin-bottom: 14px;
  color: var(--color-text);
  font-size: 13px;
  font-weight: 600;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

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

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 54px;
  padding-top: 22px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 13px;
}

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

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--transition-reveal),
    transform var(--transition-reveal);
}

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

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

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

.prose h2 {
  margin-top: 64px;
}

.prose h3 {
  margin-top: 38px;
}

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

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

.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

.decorated-region {
  overflow-x: clip;
}

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

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

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

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

  .desktop-nav {
    display: none;
  }

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

  .menu-toggle {
    display: grid;
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: clamp(24px, 7vw, 30px);
    line-height: 1.18;
  }

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

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

  .section-lead {
    font-size: 16px;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --section-space: 72px;
  }

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

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

  .language-full {
    display: none;
  }

  .language-short {
    display: inline;
  }

  .language-button {
    min-width: 44px;
    min-height: 44px;
    justify-content: center;
    padding-inline: 10px;
  }

  .language-menu {
    display: none !important;
  }

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

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 34px;
  }

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

  .button,
  .btn {
    padding-inline: 20px;
  }

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

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

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