:root {
  --color-bg: #F6F6F8;
  --color-panel: #FFFFFF;
  --color-panel-soft: #EEEFF4;
  --color-border: #DFE1EA;
  --color-accent: #4338CA;
  --color-accent-dark: #3025A6;
  --color-accent-alt: #0EA5A4;
  --color-ink: #14152B;
  --color-ink-raised: #1E2040;
  --color-text: #14152B;
  --color-muted: #5C5F78;
  --color-success: #1B9E6A;
  --color-warning: #D98E0B;
  --color-error: #D4384A;
  --color-on-dark: #FFFFFF;
  --color-halo-accent: rgba(67, 56, 202, .06);
  --color-halo-alt: rgba(14, 165, 164, .045);
  --color-shadow-accent: rgba(67, 56, 202, .30);
  --color-shadow-ink: rgba(20, 21, 43, .22);
  --color-shadow-card: rgba(67, 56, 202, .16);
  --color-shadow-float: rgba(67, 56, 202, .22);
  --color-panel-chip: rgba(255, 255, 255, .06);
  --color-panel-chip-active: rgba(255, 255, 255, .10);
  --color-panel-line: rgba(255, 255, 255, .08);
  --color-panel-line-strong: rgba(255, 255, 255, .14);
  --color-panel-text: rgba(255, 255, 255, .86);
  --color-panel-text-muted: rgba(255, 255, 255, .50);
  --color-panel-text-faint: rgba(255, 255, 255, .34);
  --color-flag-red: #D4384A;
  --color-flag-red-dark: #B91C35;
  --color-flag-blue: #244B9B;
  --color-flag-white: #FFFFFF;
  --color-flag-star: #FFFFFF;
  --font-display: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-round: 999px;
  --shadow-accent: 0 28px 64px -28px var(--color-shadow-accent);
  --shadow-ink: 0 12px 28px -12px var(--color-shadow-ink);
  --shadow-card: 0 18px 40px -26px var(--color-shadow-card);
  --shadow-float: 0 10px 24px -10px var(--color-shadow-float);
  --content-width: 1280px;
  --reading-width: 780px;
  --gutter: 24px;
  --header-height: 64px;
  --section-space: 96px;
  --toc-offset: 132px;
  --transition-fast: 150ms ease;
  --transition-reveal: 560ms cubic-bezier(.22, 1, .36, 1);
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  overflow-x: clip;
  background: var(--color-bg);
  color: var(--color-text);
  font: 15px/1.65 var(--font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body,
button,
input,
select,
textarea {
  font-family: var(--font-body);
}

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

img {
  height: auto;
}

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

button,
summary {
  cursor: pointer;
}

a {
  color: inherit;
  text-underline-offset: .2em;
}

p,
h1,
h2,
h3,
h4,
ul,
ol,
dl,
dd,
figure,
blockquote,
pre {
  margin: 0;
}

ul,
ol {
  padding: 0;
}

li {
  list-style: none;
}

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

h1 {
  font-size: clamp(52px, 5vw, 68px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.02em;
}

h2 {
  font-size: clamp(36px, 4vw, 52px);
  font-weight: 850;
  line-height: 1.15;
  letter-spacing: -.02em;
}

h3 {
  font-size: clamp(22px, 2.5vw, 28px);
  font-weight: 750;
  line-height: 1.25;
  letter-spacing: -.01em;
}

code,
kbd,
samp,
pre,
.mono {
  font-family: var(--font-mono);
  font-feature-settings: "tnum" 1;
}

code {
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-ink);
  color: var(--color-panel-text);
  -webkit-overflow-scrolling: touch;
}

button,
a,
summary,
input,
select,
textarea {
  -webkit-tap-highlight-color: transparent;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="tab"]:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: var(--content-width);
  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;
  max-width: 100%;
}

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

.section-head {
  max-width: 760px;
  margin-inline: auto;
  margin-bottom: 42px;
  text-align: center;
}

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

.section-signal {
  display: grid;
  width: 34px;
  height: 34px;
  margin: 0 auto 14px;
  place-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel-soft);
  color: var(--color-muted);
}

.section-signal svg {
  width: 18px;
  height: 18px;
}

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

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

.gradient-text {
  background: linear-gradient(92deg, var(--color-accent), var(--color-accent-alt));
  color: transparent;
  background-clip: text;
  -webkit-background-clip: text;
}

.card,
.panel {
  min-width: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

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

.badge,
.fact-pill,
.tag {
  display: inline-flex;
  min-height: 28px;
  max-width: 100%;
  align-items: center;
  gap: 7px;
  padding: 5px 11px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel-soft);
  color: var(--color-muted);
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.25;
  text-overflow: ellipsis;
}

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

.btn {
  display: inline-flex;
  min-width: 24px;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border: 1.5px solid var(--color-ink);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 650;
  line-height: 1;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.btn-solid {
  background: var(--color-ink);
  color: var(--color-on-dark);
}

.btn-solid:hover {
  border-color: var(--color-ink-raised);
  background: var(--color-ink-raised);
}

.btn-outline {
  background: transparent;
  color: var(--color-ink);
}

.btn-outline:hover {
  background: var(--color-panel-soft);
}

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

.btn-soft:hover {
  border-color: var(--color-ink);
  background: var(--color-panel);
}

.btn-small {
  min-height: 36px;
  padding: 8px 16px;
  font-size: 14px;
}

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

.head-row {
  display: flex;
  height: var(--header-height);
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  min-height: 44px;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-mark {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  border-radius: 9px;
  box-shadow: var(--shadow-float);
}

.brand-word {
  color: var(--color-text);
  font: 800 17px/1 var(--font-display);
  letter-spacing: -.02em;
}

.brand-local {
  color: var(--color-muted);
  font-weight: 550;
}

.desktop-nav {
  display: flex;
  height: var(--header-height);
  align-items: stretch;
  gap: 20px;
  margin-left: 4px;
}

.desktop-nav a {
  position: relative;
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  padding-inline: 2px;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 520;
  text-decoration: none;
}

.desktop-nav a:hover,
.desktop-nav a[aria-current="page"] {
  color: var(--color-text);
}

.desktop-nav a[aria-current="page"] {
  font-weight: 650;
}

.desktop-nav a[aria-current="page"]::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  border-radius: 2px 2px 0 0;
  background: var(--color-accent);
  content: "";
}

.head-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.login-link {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-sm);
  background: var(--color-ink);
  color: var(--color-on-dark);
  font-size: 14px;
  font-weight: 650;
  line-height: 1;
  text-decoration: none;
}

.lang-box {
  position: relative;
}

.lang-toggle,
.menu-toggle {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel-soft);
  color: var(--color-muted);
}

.lang-toggle {
  padding-inline: 12px;
  font-size: 13px;
  font-weight: 600;
}

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  display: none;
  width: 164px;
  padding: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  box-shadow: var(--shadow-float);
}

.lang-box.open .lang-menu {
  display: grid;
}

.lang-menu a {
  display: flex;
  min-height: 40px;
  align-items: center;
  padding-inline: 10px;
  border-radius: var(--radius-xs);
  color: var(--color-muted);
  text-decoration: none;
}

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

.menu-toggle {
  display: none;
  padding: 0;
}

.menu-toggle svg {
  width: 21px;
  height: 21px;
}

.mobile-nav {
  display: none;
}

.mobile-veil {
  display: none;
}

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

.footer-main {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1.4fr .9fr;
  gap: 44px;
  padding-top: 56px;
  padding-bottom: 42px;
}

.footer-brand p {
  max-width: 330px;
  margin-top: 16px;
  color: var(--color-muted);
}

.footer-title {
  margin-bottom: 14px;
  color: var(--color-text);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: .04em;
}

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

.footer-links a {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  color: var(--color-muted);
  font-size: 14px;
  text-decoration: none;
}

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

.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-keywords a {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  padding: 5px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel-soft);
  color: var(--color-muted);
  font-size: 12.5px;
  text-decoration: none;
}

.footer-bottom {
  display: flex;
  min-height: 62px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 13px;
}

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

.footer-legal a {
  min-height: 24px;
  text-decoration: none;
}

.reveal {
  transition: opacity var(--transition-reveal), transform var(--transition-reveal);
}

.reveal.pending {
  opacity: 0;
  transform: translateY(16px);
}

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

#server-status {
  position: relative;
  display: block;
  width: 100%;
  max-width: 100%;
  margin-bottom: 32px;
  overflow: hidden;
}

#server-status > * {
  min-width: 0;
}

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

.prose > * + * {
  margin-top: 20px;
}

.prose h2 {
  margin-top: 58px;
}

.prose h3 {
  margin-top: 36px;
}

.prose p,
.prose li {
  overflow-wrap: break-word;
}

.prose ul,
.prose ol {
  display: grid;
  gap: 10px;
  padding-left: 24px;
}

.prose li {
  list-style: disc;
}

.prose ol li {
  list-style: decimal;
}

.prose a {
  color: var(--color-accent-dark);
}

body:has(.toc-tabs) section[id] {
  scroll-margin-top: var(--toc-offset);
}

.ticker {
  width: 100%;
  max-width: 100%;
  overflow: hidden;
}

.ticker-track {
  display: flex;
  width: max-content;
  align-items: center;
  gap: 10px;
  will-change: transform;
}

@media (max-width: 1100px) {
  .desktop-nav {
    gap: 14px;
  }

  .desktop-nav a {
    font-size: 13px;
  }

  .footer-main {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 900px) {
  .desktop-nav,
  .lang-box {
    display: none;
  }

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

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

  .mobile-nav {
    position: absolute;
    z-index: 53;
    top: var(--header-height);
    right: 0;
    left: 0;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-panel);
    box-shadow: var(--shadow-float);
  }

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

  .mobile-nav-inner {
    display: grid;
    gap: 4px;
    padding: 12px var(--gutter) 18px;
  }

  .mobile-nav a {
    display: flex;
    width: 100%;
    min-height: 46px;
    align-items: center;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-muted);
    text-decoration: none;
  }

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

  .mobile-language-title {
    margin: 12px 12px 3px;
    color: var(--color-muted);
    font-size: 12px;
    font-weight: 700;
  }

  .mobile-veil {
    position: fixed;
    z-index: 40;
    inset: var(--header-height) 0 0;
    background: var(--color-shadow-ink);
  }

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

@media (max-width: 768px) {
  :root {
    --section-space: 72px;
  }

  h1 {
    font-size: clamp(28px, 10vw, 40px);
    line-height: 1.12;
  }

  h2 {
    font-size: clamp(30px, 8vw, 40px);
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
    padding-top: 18px;
    padding-bottom: 18px;
  }
}

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

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

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

  .wrap,
  .reading-wrap,
  .section,
  main,
  article,
  section {
    max-width: 100%;
  }

  .section {
    overflow-x: clip;
  }

  .head-row {
    gap: 10px;
  }

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

  .login-link {
    padding-inline: 12px;
  }

  .btn {
    max-width: 100%;
  }

  .footer-keywords a,
  .badge,
  .fact-pill,
  .tag {
    white-space: normal;
  }
}

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

  .head-tools {
    gap: 6px;
  }

  .login-link {
    padding-inline: 10px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }

  .reveal,
  .reveal.pending {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .ticker-track {
    width: auto;
    flex-wrap: wrap;
    transform: none !important;
  }
}