:root {
  --color-bg: #EAF3FB;
  --color-panel: #F7FBFF;
  --color-panel-strong: #DCE9F5;
  --color-border: #C3D6E8;
  --color-accent: #C321CE;
  --color-accent-dark: #93179E;
  --color-text: #16222E;
  --color-muted: #52667A;
  --color-success: #1B9E62;
  --color-warning: #D98A0C;
  --color-error: #DC4444;
  --color-white: #FFFFFF;
  --color-teal: #2C556B;
  --color-ring-start: #5B92DB;
  --color-ring-end: #2F5F9F;
  --color-flag-red: #D8402F;
  --color-flag-navy: #2E4C8F;
  --color-flag-blue: #27509B;
  --color-focus-shadow: rgba(195, 33, 206, .2);
  --color-shadow-soft-a: rgba(22, 34, 46, .05);
  --color-shadow-soft-b: rgba(46, 85, 107, .14);
  --color-shadow-card-a: rgba(22, 34, 46, .06);
  --color-shadow-card-b: rgba(46, 85, 107, .18);
  --color-shadow-accent-a: rgba(147, 23, 158, .18);
  --color-shadow-accent-b: rgba(195, 33, 206, .3);
  --color-accent-tint: rgba(195, 33, 206, .16);
  --color-line-muted: rgba(44, 85, 107, .38);
  --font-display: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --radius-xl: 32px;
  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --radius-pill: 999px;
  --shadow-soft: 0 2px 6px var(--color-shadow-soft-a), 0 16px 36px var(--color-shadow-soft-b);
  --shadow-card: 0 3px 8px var(--color-shadow-card-a), 0 22px 44px var(--color-shadow-card-b);
  --shadow-accent: 0 3px 8px var(--color-shadow-accent-a), 0 12px 26px var(--color-shadow-accent-b);
  --content-width: 1280px;
  --reading-width: 820px;
  --header-height: 72px;
  --gutter: 40px;
  --section-space: 96px;
  --toc-offset: 88px;
  --transition-fast: 180ms ease;
  --transition-reveal: 620ms cubic-bezier(.22, .7, .3, 1);
}
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  background: var(--color-bg);
}
html.nav-open {
  overflow: hidden;
}
body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body,
button,
input,
select,
textarea {
  font: inherit;
}
img,
svg,
video {
  display: block;
  max-width: 100%;
}
img {
  height: auto;
}
a {
  color: inherit;
  text-decoration: none;
}
button,
input,
select,
textarea {
  color: inherit;
}
button,
summary {
  cursor: pointer;
}
ul,
ol {
  margin: 0;
}
ul[role="list"],
ol[role="list"],
.clean-list {
  padding: 0;
  list-style: none;
}
h1,
h2,
h3,
h4,
p,
figure,
blockquote {
  margin-top: 0;
}
h1,
h2,
h3,
h4 {
  color: var(--color-text);
  font-family: var(--font-display);
  text-wrap: balance;
}
h1 {
  margin-bottom: 20px;
  font-size: clamp(52px, 5vw, 72px);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.14;
}
h2 {
  margin-bottom: 20px;
  font-size: clamp(32px, 3.5vw, 48px);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.18;
}
h3 {
  margin-bottom: 12px;
  font-size: clamp(21px, 2vw, 28px);
  font-weight: 750;
  line-height: 1.3;
}
p {
  margin-bottom: 1em;
}
strong {
  color: var(--color-text);
}
code,
kbd,
samp,
pre {
  font-family: var(--font-mono);
}
code {
  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-strong);
  -webkit-overflow-scrolling: touch;
}
::selection {
  background: var(--color-accent);
  color: var(--color-white);
}
:where(a, button, input, select, textarea, summary, [role="tab"]):focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  box-shadow: 0 0 0 5px var(--color-focus-shadow);
}
.no-break {
  white-space: nowrap;
}
@media (max-width: 640px) {
  .no-break {
    white-space: normal;
  }
}
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.sr-only,
.sr-defs {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.wrap {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.reading-wrap {
  width: 100%;
  max-width: var(--reading-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section {
  position: relative;
  overflow-x: clip;
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}
.section-head {
  max-width: 760px;
  margin-bottom: 42px;
}
.section-head.center {
  margin-inline: auto;
  text-align: center;
}
.eyebrow {
  margin-bottom: 12px;
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}
.muted {
  color: var(--color-muted);
}
.accent-text {
  color: var(--color-accent);
}
.highlight {
  color: var(--color-accent);
  background-image: linear-gradient(to top, var(--color-accent-tint), var(--color-accent-tint));
  background-position: 0 92%;
  background-repeat: no-repeat;
  background-size: 100% 12px;
}
.panel,
.card {
  min-width: 0;
  border: 1px solid var(--color-border);
  background: var(--color-panel);
}
.panel {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-soft);
}
.card {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}
.badge,
.chip {
  display: inline-flex;
  min-height: 28px;
  max-width: 100%;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 700;
}
.badge-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  background: var(--color-success);
}
.button {
  display: inline-flex;
  min-width: 24px;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 28px;
  border: 1.5px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 16px;
  font-weight: 750;
  line-height: 1.2;
  text-align: center;
  transition: transform var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}
.button:hover {
  transform: translateY(-1px);
}
.button-primary {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: var(--shadow-accent);
}
.button-primary:hover {
  border-color: var(--color-accent-dark);
  background: var(--color-accent-dark);
}
.button-secondary {
  border-color: var(--color-border);
  background: var(--color-white);
  color: var(--color-text);
}
.button-secondary:hover {
  border-color: var(--color-muted);
  background: var(--color-panel);
}
.button-outline {
  border-color: var(--color-text);
  background: transparent;
}
.button-outline:hover {
  background: var(--color-text);
  color: var(--color-panel);
}
.button-small {
  min-height: 40px;
  padding: 9px 20px;
  font-size: 14px;
}
.button[aria-disabled="true"],
.button:disabled {
  cursor: not-allowed;
  opacity: .55;
  transform: none;
}
.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
}
.site-head {
  position: relative;
  z-index: 100;
  height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}
.head-wrap {
  width: 100%;
  max-width: var(--content-width);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: 34px;
}
.brand {
  display: inline-flex;
  min-height: 44px;
  flex: 0 0 auto;
  align-items: center;
  gap: 11px;
}
.brand-logo {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
}
.brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .02em;
}
.brand-local {
  color: var(--color-muted);
  font-size: 15px;
  font-weight: 600;
}
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 15px;
  font-weight: 600;
}
.desktop-nav > a,
.nav-more-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 5px;
  padding-inline: 2px;
}
.desktop-nav a:hover,
.nav-more-button:hover,
.desktop-nav a.is-active,
.nav-more.is-active > .nav-more-button {
  color: var(--color-accent-dark);
}
.nav-more {
  position: relative;
}
.nav-more-button {
  border: 0;
  background: transparent;
}
.nav-chevron {
  transition: transform var(--transition-fast);
}
.nav-more:hover .nav-chevron,
.nav-more:focus-within .nav-chevron {
  transform: rotate(180deg);
}
.nav-menu {
  position: absolute;
  top: calc(100% + 7px);
  left: -14px;
  min-width: 184px;
  padding: 8px;
  visibility: hidden;
  opacity: 0;
  transform: translateY(6px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-white);
  box-shadow: var(--shadow-soft);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}
.nav-more:hover .nav-menu,
.nav-more:focus-within .nav-menu,
.nav-more.is-open .nav-menu {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
}
.nav-menu a {
  display: flex;
  min-height: 42px;
  align-items: center;
  padding: 8px 13px;
  border-radius: var(--radius-sm);
}
.nav-menu a:hover,
.nav-menu a.is-active {
  background: var(--color-bg);
}
.header-tools {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 14px;
}
.language {
  position: relative;
}
.language-button {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 6px;
  border: 0;
  background: transparent;
  color: var(--color-muted);
  font-size: 14px;
}
.language-button:hover {
  color: var(--color-text);
}
.language-menu {
  position: absolute;
  top: calc(100% + 7px);
  right: 0;
  width: 164px;
  padding: 8px;
  visibility: hidden;
  opacity: 0;
  transform: translateY(6px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-white);
  box-shadow: var(--shadow-soft);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
}
.language.is-open .language-menu {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
}
.language-menu a {
  display: flex;
  min-height: 42px;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}
.language-menu a:hover,
.language-menu a[aria-current="true"] {
  background: var(--color-bg);
}
.login-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  padding: 8px 23px;
  border: 1.5px solid var(--color-text);
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 700;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.login-button:hover {
  background: var(--color-text);
  color: var(--color-panel);
}
.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  padding: 9px;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
}
.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  width: 21px;
  height: 2px;
  display: block;
  border-radius: var(--radius-pill);
  background: var(--color-text);
  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: -7px;
}
.menu-toggle-lines::after {
  top: 7px;
}
.menu-toggle[aria-expanded="true"] .menu-toggle-lines {
  background: transparent;
}
.menu-toggle[aria-expanded="true"] .menu-toggle-lines::before {
  transform: translateY(7px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] .menu-toggle-lines::after {
  transform: translateY(-7px) rotate(-45deg);
}
.mobile-nav {
  position: absolute;
  z-index: 102;
  top: var(--header-height);
  left: 0;
  width: 100%;
  max-height: calc(100dvh - var(--header-height));
  padding: 12px var(--gutter) 20px;
  display: none;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
  box-shadow: var(--shadow-soft);
}
.mobile-nav.is-open {
  display: block;
}
.mobile-nav ul {
  padding: 0;
  list-style: none;
}
.mobile-nav a {
  width: 100%;
  min-height: 46px;
  display: flex;
  align-items: center;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-weight: 650;
}
.mobile-nav a:hover,
.mobile-nav a.is-active {
  background: var(--color-panel-strong);
  color: var(--color-accent-dark);
}
.mobile-language-label {
  padding: 14px 12px 5px;
  color: var(--color-muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .12em;
}
.nav-veil {
  position: fixed;
  z-index: 90;
  inset: var(--header-height) 0 0;
  display: none;
  border: 0;
  background: var(--color-shadow-soft-b);
}
.nav-veil.is-open {
  display: block;
}
.site-footer {
  position: relative;
  overflow-x: clip;
  padding-top: 72px;
  background: var(--color-panel-strong);
  border-top: 1px solid var(--color-border);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr 1.15fr .8fr;
  gap: 42px;
  padding-bottom: 48px;
}
.footer-brand {
  max-width: 320px;
}
.footer-brand .brand {
  margin-bottom: 16px;
}
.footer-title {
  margin-bottom: 14px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .08em;
}
.footer-links {
  padding: 0;
  list-style: none;
}
.footer-links li + li {
  margin-top: 7px;
}
.footer-links a {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  color: var(--color-muted);
}
.footer-links a:hover {
  color: var(--color-accent-dark);
}
.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.footer-bottom {
  padding-top: 18px;
  padding-bottom: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px 24px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 13px;
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.reveal {
  transition: opacity var(--transition-reveal), transform var(--transition-reveal);
}
.reveal.pending {
  opacity: 0;
  transform: translateY(16px);
}
.reveal.shown {
  opacity: 1;
  transform: none;
}
.prose {
  min-width: 0;
  font-size: 17px;
}
.prose h2,
.prose h3 {
  scroll-margin-top: calc(var(--header-height) + 24px);
}
.prose h2 {
  margin-top: 2.2em;
}
.prose h3 {
  margin-top: 1.7em;
}
.prose a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.prose li + li {
  margin-top: .45em;
}
.prose img {
  border-radius: var(--radius-lg);
}
.tilt {
  transform: rotate(-.35deg);
}
@media (max-width: 1080px) {
  .desktop-nav {
    gap: 17px;
    font-size: 14px;
  }
  .head-wrap {
    gap: 22px;
  }
  .language-label {
    display: none;
  }
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 820px) {
  :root {
    --gutter: 22px;
    --section-space: 72px;
  }
  .desktop-nav,
  .desktop-language {
    display: none;
  }
  .header-tools {
    margin-left: auto;
    gap: 8px;
  }
  .menu-toggle {
    display: inline-flex;
  }
  .mobile-nav .mobile-language {
    display: block;
  }
  .brand-local {
    display: none;
  }
}
@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --section-space: 58px;
    --radius-xl: 24px;
    --radius-lg: 18px;
  }
  h1 {
    font-size: clamp(28px, 10vw, 40px);
    line-height: 1.14;
    letter-spacing: -.01em;
  }
  h2 {
    font-size: clamp(27px, 8vw, 36px);
  }
  .wrap,
  .reading-wrap {
    padding-inline: var(--gutter);
  }
  .login-button {
    padding-inline: 16px;
  }
  .brand-name {
    font-size: 17px;
  }
  .button-row,
  .button-row .button {
    width: 100%;
  }
  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
  }
  .tilt,
  [class*="tilt"] {
    transform: none;
  }
}
@media (max-width: 380px) {
  .brand-logo {
    width: 30px;
    height: 30px;
  }
  .header-tools {
    gap: 3px;
  }
  .login-button {
    padding-inline: 13px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal,
  .reveal.pending {
    opacity: 1;
    transform: none;
  }
}