:root {
  --color-paper: #FAF6EE;
  --color-paper-panel: #FFFDF7;
  --color-night: #171130;
  --color-night-raised: #211A44;
  --color-border: #E7DECC;
  --color-accent: #5C2BE2;
  --color-accent-dark: #4318B8;
  --color-text: #201A33;
  --color-text-muted: #6B6478;
  --color-success: #1F9D62;
  --color-warning: #D98A0C;
  --color-error: #D6453A;
  --color-white: #FFFFFF;
  --color-cream-glow: #F4EDDD;
  --color-violet-muted: #A49DC6;
  --color-pill: #F0E8D7;
  --color-night-edge: rgba(244, 237, 221, .22);
  --color-night-border: rgba(244, 237, 221, .14);
  --color-accent-glow: rgba(92, 43, 226, .35);
  --color-button-edge: rgba(32, 26, 51, .10);
  --color-shadow: rgba(23, 17, 48, .18);
  --color-shadow-strong: rgba(23, 17, 48, .35);
  --color-overlay: rgba(23, 17, 48, .58);
  --color-code-bg: #EEE7D9;
  --color-table-stripe: #F5EFE4;
  --color-focus: #5C2BE2;
  --color-flag-red: #CD2F3A;
  --color-flag-blue: #27459C;
  --color-flag-navy: #2A3560;
  --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-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --header-height: 72px;
  --content-width: 1200px;
  --article-width: 800px;
  --gutter: clamp(16px, 4vw, 44px);
  --section-space: clamp(72px, 9vw, 124px);
  --focus-ring: 2px solid var(--color-focus);
  --ease-standard: cubic-bezier(.2, .7, .3, 1);
  --shadow-panel: 0 18px 48px -30px var(--color-shadow-strong);
  --shadow-button: 0 1px 2px var(--color-button-edge), 0 14px 28px -14px var(--color-accent-glow);
}
*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  background: var(--color-paper);
}
html.nav-open {
  overflow: hidden;
}
body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--color-paper);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
main,
section,
article,
aside,
header,
footer,
nav,
div {
  min-width: 0;
}
img,
svg,
video {
  display: block;
  max-width: 100%;
}
img {
  height: auto;
}
button,
input,
select,
textarea {
  color: inherit;
  font: inherit;
}
button {
  border: 0;
}
a {
  color: inherit;
  text-decoration: none;
}
p,
h1,
h2,
h3,
h4,
ul,
ol,
blockquote,
figure {
  margin-top: 0;
}
ul,
ol {
  padding-left: 1.25em;
}
.no-break {
  white-space: nowrap;
}
.wrap {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.article-wrap {
  width: 100%;
  max-width: var(--article-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}
.section-compact {
  padding-top: clamp(48px, 6vw, 80px);
  padding-bottom: clamp(48px, 6vw, 80px);
}
.section-dark {
  position: relative;
  overflow-x: clip;
  background: var(--color-night);
  color: var(--color-cream-glow);
}
.section-paper {
  position: relative;
  overflow-x: clip;
  background: var(--color-paper);
}
.eyebrow {
  display: inline-flex;
  min-height: 24px;
  align-items: center;
  gap: 9px;
  margin-bottom: 16px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.eyebrow-dot {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: 2px;
  background: var(--color-accent);
}
h1,
h2,
h3,
h4 {
  color: inherit;
  font-family: var(--font-display);
  font-weight: 600;
  text-wrap: balance;
}
h1,
.hero-title {
  margin-bottom: 20px;
  font-size: clamp(52px, 5.1vw, 72px);
  line-height: 1.1;
  letter-spacing: -.018em;
}
h2 {
  margin-bottom: 20px;
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1.16;
  letter-spacing: -.012em;
}
h3 {
  margin-bottom: 14px;
  font-size: clamp(22px, 2.4vw, 30px);
  line-height: 1.28;
}
h4 {
  margin-bottom: 10px;
  font-size: 18px;
  line-height: 1.4;
}
p {
  margin-bottom: 1.1em;
}
.lead {
  max-width: 720px;
  color: var(--color-text-muted);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.7;
}
.muted {
  color: var(--color-text-muted);
}
.accent-text {
  color: var(--color-accent);
}
.mono {
  font-family: var(--font-mono);
}
code,
kbd,
samp {
  border-radius: var(--radius-xs);
  background: var(--color-code-bg);
  font-family: var(--font-mono);
  font-size: .9em;
  overflow-wrap: anywhere;
}
code {
  padding: .12em .35em;
}
pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--color-night-border);
  border-radius: var(--radius-sm);
  background: var(--color-night-raised);
  color: var(--color-cream-glow);
  -webkit-overflow-scrolling: touch;
}
pre code {
  padding: 0;
  background: transparent;
  color: inherit;
  overflow-wrap: normal;
}
hr {
  height: 1px;
  border: 0;
  background: var(--color-border);
}
.btn,
.btn-primary,
.btn-secondary,
.btn-dark {
  display: inline-flex;
  min-width: 24px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border-radius: var(--radius-sm);
  padding: 11px 25px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
  text-align: center;
  transition: background-color .16s ease, color .16s ease, border-color .16s ease, transform .16s ease;
}
.btn-primary {
  border: 1px solid var(--color-accent);
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: var(--shadow-button);
}
.btn-primary:hover {
  border-color: var(--color-accent-dark);
  background: var(--color-accent-dark);
  transform: translateY(-1px);
}
.btn-secondary {
  border: 1px solid var(--color-text);
  background: transparent;
  color: var(--color-text);
}
.btn-secondary:hover {
  background: var(--color-pill);
}
.btn-dark {
  border: 1px solid var(--color-night-border);
  background: var(--color-night);
  color: var(--color-cream-glow);
}
.btn-dark:hover {
  background: var(--color-night-raised);
  transform: translateY(-1px);
}
.btn[aria-disabled="true"],
.btn:disabled {
  cursor: not-allowed;
  opacity: .55;
  transform: none;
}
a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="tab"]:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 3px;
}
.site-head {
  position: relative;
  z-index: 100;
  display: flex;
  height: var(--header-height);
  align-items: center;
  gap: 28px;
  padding-inline: clamp(20px, 3vw, 44px);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-paper);
}
.site-brand {
  display: inline-flex;
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
  min-height: 44px;
}
.site-brand-logo {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}
.site-brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: .01em;
  white-space: nowrap;
}
.site-brand-local {
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 500;
}
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 14px;
}
.desktop-nav a {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  border-radius: var(--radius-pill);
  padding: 8px 15px;
  color: var(--color-text-muted);
  font-size: 14px;
  transition: background-color .15s ease, color .15s ease;
}
.desktop-nav a:hover {
  color: var(--color-text);
}
.desktop-nav a.is-active {
  background: var(--color-pill);
  color: var(--color-text);
  font-weight: 500;
}
.header-tools {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}
.language-switch {
  position: relative;
}
.language-button {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding-inline: 8px;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 13px;
}
.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 130;
  display: none;
  width: 168px;
  padding: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-paper-panel);
  box-shadow: var(--shadow-panel);
}
.language-menu.is-open {
  display: block;
}
.language-menu a {
  display: flex;
  min-height: 42px;
  align-items: center;
  border-radius: var(--radius-xs);
  padding: 8px 10px;
  color: var(--color-text-muted);
  font-size: 13px;
}
.language-menu a:hover,
.language-menu a[aria-current="true"] {
  background: var(--color-pill);
  color: var(--color-text);
}
.header-login {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-text);
  border-radius: var(--radius-sm);
  padding: 7px 19px;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 500;
}
.header-login:hover {
  background: var(--color-text);
  color: var(--color-paper);
}
.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
}
.menu-toggle svg {
  width: 22px;
  height: 22px;
}
.mobile-nav {
  position: absolute;
  top: var(--header-height);
  right: 0;
  left: 0;
  z-index: 125;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-paper-panel);
}
.mobile-nav.is-open {
  display: block;
}
.mobile-nav-list,
.mobile-language-list {
  margin: 0;
  padding: 8px var(--gutter);
  list-style: none;
}
.mobile-language-list {
  border-top: 1px solid var(--color-border);
}
.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  border-radius: var(--radius-sm);
  padding: 11px 12px;
  color: var(--color-text-muted);
}
.mobile-nav a:hover,
.mobile-nav a.is-active,
.mobile-nav a[aria-current="true"] {
  background: var(--color-pill);
  color: var(--color-text);
}
.nav-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 90;
  display: none;
  background: var(--color-overlay);
}
.nav-veil.is-open {
  display: block;
}
.site-footer {
  border-top: 1px solid var(--color-night-border);
  background: var(--color-night);
  color: var(--color-cream-glow);
}
.footer-main {
  display: grid;
  grid-template-columns: minmax(220px, 1.35fr) repeat(3, minmax(150px, 1fr));
  gap: clamp(28px, 5vw, 72px);
  padding-top: 64px;
  padding-bottom: 52px;
}
.footer-brand {
  max-width: 350px;
}
.footer-brand .site-brand {
  margin-bottom: 18px;
}
.footer-brand p {
  color: var(--color-violet-muted);
  font-size: 14px;
}
.footer-heading {
  margin-bottom: 15px;
  color: var(--color-cream-glow);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .12em;
}
.footer-links {
  margin: 0;
  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-violet-muted);
  font-size: 14px;
}
.footer-links a:hover {
  color: var(--color-cream-glow);
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 20px;
  padding-bottom: 24px;
  border-top: 1px solid var(--color-night-border);
  color: var(--color-violet-muted);
  font-family: var(--font-mono);
  font-size: 11px;
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}
.card,
.panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-paper-panel);
}
.card {
  padding: clamp(22px, 3vw, 34px);
  box-shadow: var(--shadow-panel);
}
.panel {
  padding: clamp(20px, 2.5vw, 28px);
}
.dark-panel {
  border: 1px solid var(--color-night-border);
  border-radius: var(--radius-sm);
  background: var(--color-night-raised);
  color: var(--color-cream-glow);
}
.badge,
.tag,
.fact-chip {
  display: inline-flex;
  max-width: 100%;
  min-height: 24px;
  align-items: center;
  gap: 7px;
  overflow: hidden;
  border-radius: var(--radius-pill);
  padding: 4px 10px;
  font-size: 12px;
  line-height: 1.35;
  text-overflow: ellipsis;
}
.badge {
  background: var(--color-pill);
  color: var(--color-text);
}
.tag {
  border: 1px solid var(--color-border);
  background: var(--color-paper-panel);
  color: var(--color-text-muted);
}
.fact-chip {
  border-radius: var(--radius-xs);
  background: var(--color-night-raised);
  color: var(--color-cream-glow);
  font-family: var(--font-mono);
}
.status-dot {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: 2px;
  background: var(--color-success);
}
.reveal {
  transition: opacity .55s var(--ease-standard), transform .55s var(--ease-standard);
}
.reveal.pending {
  opacity: 0;
  transform: translateY(16px);
}
.reveal.shown {
  opacity: 1;
  transform: none;
}
.prose {
  color: var(--color-text);
}
.prose h2,
.prose h3 {
  scroll-margin-top: calc(var(--header-height) + 28px);
}
.prose h2 {
  margin-top: 2.1em;
}
.prose h3 {
  margin-top: 1.7em;
}
.prose a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.prose li + li {
  margin-top: .45em;
}
.prose img {
  border-radius: var(--radius-sm);
}
.prose > .data-table {
  display: block;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.tilt,
.tilt-card {
  transform: rotate(-.45deg);
}
body:has(.toc-tabs) section[id] {
  scroll-margin-top: 136px;
}
@media (max-width: 1080px) {
  .desktop-nav {
    gap: 0;
    margin-left: 0;
  }
  .desktop-nav a {
    padding-inline: 10px;
  }
  .footer-main {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 920px) {
  .desktop-nav,
  .language-switch {
    display: none;
  }
  .header-tools {
    margin-left: auto;
  }
  .menu-toggle {
    display: inline-flex;
  }
}
@media (max-width: 768px) {
  h1,
  .hero-title {
    font-size: clamp(28px, 9.5vw, 40px);
    line-height: 1.12;
    letter-spacing: -.012em;
  }
  h2 {
    font-size: clamp(28px, 8vw, 38px);
  }
  .site-head {
    gap: 10px;
    padding-inline: var(--gutter);
  }
  .site-brand-local {
    display: none;
  }
  .header-tools {
    gap: 4px;
    margin-left: auto;
  }
  .header-login {
    min-width: 58px;
    padding-inline: 12px;
  }
  .footer-main {
    grid-template-columns: 1fr 1fr;
  }
  .footer-brand {
    grid-column: 1 / -1;
  }
  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }
}
@media (max-width: 640px) {
  .wrap,
  .article-wrap {
    padding-inline: max(16px, var(--gutter));
  }
  .section {
    padding-top: 64px;
    padding-bottom: 64px;
  }
  .tilt,
  .tilt-card {
    transform: none;
  }
  .footer-main {
    grid-template-columns: 1fr;
  }
  .footer-brand {
    grid-column: auto;
  }
}
@media (max-width: 380px) {
  .site-brand-name {
    font-size: 17px;
  }
  .header-login {
    min-width: 52px;
    padding-inline: 9px;
  }
  .btn,
  .btn-primary,
  .btn-secondary,
  .btn-dark {
    width: 100%;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal,
  .reveal.pending {
    opacity: 1;
    transform: none;
  }
}